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runtime/pprof: failure in TestCPUProfile on windows/arm #42862

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zx2c4 opened this issue Nov 27, 2020 · 7 comments
Open

runtime/pprof: failure in TestCPUProfile on windows/arm #42862

zx2c4 opened this issue Nov 27, 2020 · 7 comments
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arch-arm NeedsInvestigation OS-Windows
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@zx2c4
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@zx2c4 zx2c4 commented Nov 27, 2020 

--- FAIL: TestCPUProfile (7.26s)
    pprof_test.go:394: total 16 CPU profile samples collected:
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 200ms duration
    pprof_test.go:394: total 19 CPU profile samples collected:
        19: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 400ms duration
    pprof_test.go:394: total 40 CPU profile samples collected:
        39: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        1: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbc1307 (runtime.resetspinning:2902) 0xbc19b3 (runtime.schedule:3058) 0xbc20cf (runtime.park_m:3200) 0xbe9ce7 (runtime.mcall:285)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 800ms duration
    pprof_test.go:394: total 84 CPU profile samples collected:
        82: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        1: 0xbb5763 (runtime.stdcall3:1010) 0xb971cf (runtime.sysUnused:33) 0xba303f (runtime.(*pageAlloc).scavengeRangeLocked:728) 0xba2f03 (runtime.(*pageAlloc).scavengeOne:622) 0xba270f (runtime.(*pageAlloc).scavenge:413) 0xbe40e7 (runtime.bgscavenge.func2:304) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
        1: 0xbb5793 (runtime.stdcall4:1018) 0xbb2d83 (runtime.netpollBreak:71) 0xbc123b (runtime.wakeNetPoller:2880) 0xbd6f83 (runtime.modtimer:480) 0xba2313 (runtime.resettimer:532 time.resetTimer:224 runtime.scavengeSleep:237) 0xba255b (runtime.bgscavenge:366)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 1.6s duration
    pprof_test.go:394: total 159 CPU profile samples collected:
        159: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 3.2s duration
    pprof_test.go:394: total 324 CPU profile samples collected:
        319: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        2: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbc1307 (runtime.resetspinning:2902) 0xbc19b3 (runtime.schedule:3058) 0xbc20cf (runtime.park_m:3200) 0xbe9ce7 (runtime.mcall:285)
        
        3: 0xbb5763 (runtime.stdcall3:1010) 0xb971cf (runtime.sysUnused:33) 0xba303f (runtime.(*pageAlloc).scavengeRangeLocked:728) 0xba2f03 (runtime.(*pageAlloc).scavengeOne:622) 0xba270f (runtime.(*pageAlloc).scavenge:413) 0xbe40e7 (runtime.bgscavenge.func2:304) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
--- FAIL: TestCPUProfileMultithreaded (7.39s)
    pprof_test.go:394: total 29 CPU profile samples collected:
        29: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:429: runtime/pprof.cpuHog2: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.cpuHog2 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 200ms duration
    pprof_test.go:394: total 41 CPU profile samples collected:
        41: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:429: runtime/pprof.cpuHog2: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.cpuHog2 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 400ms duration
    pprof_test.go:394: total 79 CPU profile samples collected:
        79: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:429: runtime/pprof.cpuHog2: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.cpuHog2 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 800ms duration
    pprof_test.go:394: total 159 CPU profile samples collected:
        159: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:429: runtime/pprof.cpuHog2: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.cpuHog2 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 1.6s duration
    pprof_test.go:394: total 319 CPU profile samples collected:
        319: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:429: runtime/pprof.cpuHog2: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.cpuHog2 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 3.2s duration
    pprof_test.go:394: total 639 CPU profile samples collected:
        639: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHog1: 0
    pprof_test.go:429: runtime/pprof.cpuHog2: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHog1 has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.cpuHog2 has 0 samples out of 0, want at least 1, ideally 0
--- FAIL: TestCPUProfileInlining (7.27s)
    pprof_test.go:394: total 12 CPU profile samples collected:
        12: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.inlinedCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.inlinedCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 200ms duration
    pprof_test.go:394: total 21 CPU profile samples collected:
        21: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.inlinedCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.inlinedCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 400ms duration
    pprof_test.go:394: total 40 CPU profile samples collected:
        40: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.inlinedCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.inlinedCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 800ms duration
    pprof_test.go:394: total 73 CPU profile samples collected:
        73: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.inlinedCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.inlinedCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 1.6s duration
    pprof_test.go:394: total 160 CPU profile samples collected:
        159: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        1: 0xbb5763 (runtime.stdcall3:1010) 0xb971cf (runtime.sysUnused:33) 0xba303f (runtime.(*pageAlloc).scavengeRangeLocked:728) 0xba2f03 (runtime.(*pageAlloc).scavengeOne:622) 0xba270f (runtime.(*pageAlloc).scavenge:413) 0xbe40e7 (runtime.bgscavenge.func2:304) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.inlinedCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.inlinedCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 3.2s duration
    pprof_test.go:394: total 320 CPU profile samples collected:
        319: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        1: 0xbb5763 (runtime.stdcall3:1010) 0xb971cf (runtime.sysUnused:33) 0xba303f (runtime.(*pageAlloc).scavengeRangeLocked:728) 0xba2f03 (runtime.(*pageAlloc).scavengeOne:622) 0xba270f (runtime.(*pageAlloc).scavenge:413) 0xbe40e7 (runtime.bgscavenge.func2:304) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.inlinedCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.inlinedCaller has 0 samples out of 0, want at least 1, ideally 0
--- FAIL: TestCPUProfileRecursion (7.04s)
    pprof_test.go:394: total 9 CPU profile samples collected:
        9: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:400: too few samples on Windows (golang.org/issue/10842)
    pprof_test.go:323: retrying with 200ms duration
    pprof_test.go:394: total 20 CPU profile samples collected:
        18: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        2: 0xbb5763 (runtime.stdcall3:1010) 0xb971cf (runtime.sysUnused:33) 0xba303f (runtime.(*pageAlloc).scavengeRangeLocked:728) 0xba2f03 (runtime.(*pageAlloc).scavengeOne:622) 0xba270f (runtime.(*pageAlloc).scavenge:413) 0xbe40e7 (runtime.bgscavenge.func2:304) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 400ms duration
    pprof_test.go:394: total 38 CPU profile samples collected:
        38: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 800ms duration
    pprof_test.go:394: total 83 CPU profile samples collected:
        80: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        3: 0xbb5763 (runtime.stdcall3:1010) 0xb971cf (runtime.sysUnused:33) 0xba303f (runtime.(*pageAlloc).scavengeRangeLocked:728) 0xba2f03 (runtime.(*pageAlloc).scavengeOne:622) 0xba270f (runtime.(*pageAlloc).scavenge:413) 0xbe40e7 (runtime.bgscavenge.func2:304) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 1.6s duration
    pprof_test.go:394: total 162 CPU profile samples collected:
        161: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        1: 0xbb5763 (runtime.stdcall3:1010) 0xb971cf (runtime.sysUnused:33) 0xba303f (runtime.(*pageAlloc).scavengeRangeLocked:728) 0xba2f03 (runtime.(*pageAlloc).scavengeOne:622) 0xba270f (runtime.(*pageAlloc).scavenge:413) 0xbe40e7 (runtime.bgscavenge.func2:304) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCaller has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 3.2s duration
    pprof_test.go:394: total 318 CPU profile samples collected:
        318: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.inlinedCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCallee: 0
    pprof_test.go:429: runtime/pprof.recursionCaller: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.inlinedCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCallee has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:442: runtime/pprof.recursionCaller has 0 samples out of 0, want at least 1, ideally 0
--- FAIL: TestMorestack (7.04s)
    pprof_test.go:394: total 10 CPU profile samples collected:
        9: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        1: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbbc873 (runtime.ready:754) 0xbe5923 (runtime.goready.func1:347) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime.newstack,runtime/pprof.growstack: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime.newstack,runtime/pprof.growstack has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 200ms duration
    pprof_test.go:394: total 21 CPU profile samples collected:
        19: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        2: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbbc873 (runtime.ready:754) 0xbe5923 (runtime.goready.func1:347) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime.newstack,runtime/pprof.growstack: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime.newstack,runtime/pprof.growstack has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 400ms duration
    pprof_test.go:394: total 43 CPU profile samples collected:
        39: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        4: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbbc873 (runtime.ready:754) 0xbe5923 (runtime.goready.func1:347) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime.newstack,runtime/pprof.growstack: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime.newstack,runtime/pprof.growstack has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 800ms duration
    pprof_test.go:394: total 84 CPU profile samples collected:
        79: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        5: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbbc873 (runtime.ready:754) 0xbe5923 (runtime.goready.func1:347) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime.newstack,runtime/pprof.growstack: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime.newstack,runtime/pprof.growstack has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 1.6s duration
    pprof_test.go:394: total 179 CPU profile samples collected:
        157: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        22: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbbc873 (runtime.ready:754) 0xbe5923 (runtime.goready.func1:347) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
    pprof_test.go:429: runtime.newstack,runtime/pprof.growstack: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime.newstack,runtime/pprof.growstack has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 3.2s duration
    pprof_test.go:394: total 333 CPU profile samples collected:
        300: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        32: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbbc873 (runtime.ready:754) 0xbe5923 (runtime.goready.func1:347) 0xbe9d8b (runtime.systemstack:347) 0xbbd7a4 (runtime.mstart:1183)
        
        1: 0xbb5703 (runtime.stdcall1:994) 0xbb4fbb (runtime.semawakeup:793) 0xb8b123 (runtime.notewakeup:161) 0xbbf22f (runtime.startm:2281) 0xbbf7d7 (runtime.wakep:2361) 0xbc1307 (runtime.resetspinning:2902) 0xbc19b3 (runtime.schedule:3058) 0xbc285b (runtime.goexit0:3360) 0xbe9ce7 (runtime.mcall:285)
        
    pprof_test.go:429: runtime.newstack,runtime/pprof.growstack: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime.newstack,runtime/pprof.growstack has 0 samples out of 0, want at least 1, ideally 0
--- FAIL: TestCPUProfileLabel (7.18s)
    pprof_test.go:394: total 16 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        15: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 200ms duration
    pprof_test.go:394: total 19 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        18: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 400ms duration
    pprof_test.go:394: total 39 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        38: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 800ms duration
    pprof_test.go:394: total 79 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        78: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 1.6s duration
    pprof_test.go:394: total 159 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        158: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 3.2s duration
    pprof_test.go:394: total 321 CPU profile samples collected:
        4: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        317: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
--- FAIL: TestLabelRace (8.92s)
    pprof_test.go:394: total 167 CPU profile samples collected:
        2: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 200ms duration
    pprof_test.go:394: total 168 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 400ms duration
    pprof_test.go:394: total 167 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        15: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 800ms duration
    pprof_test.go:394: total 334 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        15: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 1.6s duration
    pprof_test.go:394: total 676 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        18: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        18: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        19: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
    pprof_test.go:323: retrying with 3.2s duration
    pprof_test.go:394: total 1182 CPU profile samples collected:
        1: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        15: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        18: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        18: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        19: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        18: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        18: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        16: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
        17: 0xffffffff (:0) 0xbc42d3 (runtime._System:4288)
        
    pprof_test.go:429: runtime/pprof.cpuHogger;key=value: 0
    pprof_test.go:432: no samples in expected functions
    pprof_test.go:442: runtime/pprof.cpuHogger;key=value has 0 samples out of 0, want at least 1, ideally 0
FAIL
FAIL	runtime/pprof	56.234s
ok  	runtime/race	2.037s
FAIL
go tool dist: Failed: exit status 1


Error: tests failed: dist test failed: go_test:runtime/metrics: exit status 1
@zx2c4
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@zx2c4 zx2c4 commented Nov 27, 2020

CC @bcmills @alexbrainman @bradfitz @aclements

@odeke-em odeke-em changed the title windows/arm: failure in TestCPUProfile runtime/pprof: failure in TestCPUProfile on windows/arm Nov 28, 2020
@ianlancetaylor ianlancetaylor added the NeedsInvestigation label Nov 28, 2020
@ianlancetaylor ianlancetaylor added this to the Go1.16 milestone Nov 28, 2020
@ALTree ALTree added the arch-arm label Nov 28, 2020
@zx2c4
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@zx2c4 zx2c4 commented Nov 28, 2020

I started looking into this, but I must confess I don't know the pprof code very well. It looks like most stacktraces have an abundance of _System in them, which means that the tracing algorithm in runtime/proc.go's sigprof failed and resorted to _System as the final case for putting something down. It's not clear to me why the prior lookups are failing, though.

I'm CCing @nodirt and @ianlancetaylor who seem to have written a lot of this code and might have better intuition than me on it.

@gopherbot
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@gopherbot gopherbot commented Nov 28, 2020

Change https://golang.org/cl/273826 mentions this issue: runtime/pprof: ignore test failures on windows/arm

@zx2c4
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@zx2c4 zx2c4 commented Nov 28, 2020

Change https://golang.org/cl/273826 mentions this issue: runtime/pprof: ignore test failures on windows/arm

FYI, this is not a real fix.

gopherbot pushed a commit that referenced this issue Nov 28, 2020
@zx2c4 @bradfitz
runtime/pprof: ignore test failures on windows/arm
4ce0a7c 
This is blocking forward progress of the de-bitrotting work, and I don't
know off hand how to fix this. Seeing as its disabled on other
platforms, I suspect pprof might not be a very reliable feature, so just
allow for the tests to fail for now, until somebody more motivated comes
along to fix it.

Updates #42862.

Change-Id: Ibc5cd1d82d97b9c2f887d7f3565f2fa70207c8b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/273826
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
@ianlancetaylor
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@ianlancetaylor ianlancetaylor commented Nov 28, 2020

I'm not familiar with the Windows profiling code. That said, I would start by looking at the values passed to sigprof: are they the right PC/SP/LR values? If they are, why is the traceback failing?

@egonelbre
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@egonelbre egonelbre commented Nov 30, 2020

I did notice at some point that enabling debugCheckBP fails on windows/amd64. #41995

I don't have windows/arm to test with, but I'm wondering whether it would fail as well and point to the underlying issue?

@alexbrainman
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@alexbrainman alexbrainman commented Dec 1, 2020

@zx2c4 you can try setting asyncpreemptoff, like in #42528 (comment) But I am grasping for straw.

Long time ago I would debug these things just by adding println everywhere. You can do that. Make repro as small as you can, and see why it fails.

Alex

@dmitshur dmitshur removed this from the Go1.16 milestone Feb 9, 2021
@dmitshur dmitshur added this to the Backlog milestone Feb 9, 2021
@bcmills bcmills mentioned this issue Feb 3, 2022
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@zx2c4 @egonelbre @dmitshur @ianlancetaylor @ALTree @odeke-em @gopherbot @alexbrainman