runtime:mayMoreStackPreempt: TestCrashWhileTracing failures [consistent failure]

[gopherbot]

#!watchflakes
default <- pkg == "runtime:mayMoreStackPreempt" && test == "TestCrashWhileTracing"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 1025: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0xbe
--- FAIL: TestCrashWhileTracing (0.78s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime:mayMoreStackPreempt" && test == "TestCrashWhileTracing"

2025-08-15 21:01 gotip-linux-386-longtest go@4a7fde92 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 1025: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0xbe
--- FAIL: TestCrashWhileTracing (0.78s)

2025-08-15 21:01 gotip-linux-arm64-longtest go@4a7fde92 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 977: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0xc4
--- FAIL: TestCrashWhileTracing (0.15s)

2025-08-15 21:01 gotip-windows-amd64-longtest go@4a7fde92 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 1378: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	C:/b/s/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0x8f
--- FAIL: TestCrashWhileTracing (0.19s)

2025-08-15 21:45 gotip-linux-386-longtest go@786be1d2 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 1042: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0xbe
--- FAIL: TestCrashWhileTracing (0.64s)

2025-08-15 21:45 gotip-linux-amd64-longtest go@786be1d2 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 1184: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0x8f
--- FAIL: TestCrashWhileTracing (0.12s)

2025-08-15 21:45 gotip-linux-arm64-longtest go@786be1d2 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 1007: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0xc4
--- FAIL: TestCrashWhileTracing (0.15s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime:mayMoreStackPreempt" && test == "TestCrashWhileTracing"

2025-08-15 21:45 gotip-darwin-arm64-longtest go@786be1d2 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 892: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0xc4
--- FAIL: TestCrashWhileTracing (0.11s)

2025-08-15 21:45 gotip-windows-amd64-longtest go@786be1d2 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 1270: failed to read full batch: read 4025 but wanted 65456
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	C:/b/s/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0x8f
--- FAIL: TestCrashWhileTracing (0.18s)

— watchflakes

[gopherbot]

Change https://go.dev/cl/696436 mentions this issue: internal/trace: emit final sync event for generation in Go 1.26+

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime:mayMoreStackPreempt" && test == "TestCrashWhileTracing"

2025-08-15 21:45 gotip-darwin-amd64-longtest go@786be1d2 runtime:mayMoreStackPreempt.TestCrashWhileTracing (log)

=== RUN   TestCrashWhileTracing
    crash_test.go:1026: error at event 935: incomplete generation found; trace likely truncated
    crash_test.go:1047: expected at least one full generation to have been emitted before the trace was considered broken
    crash_test.go:1052: stderr output:
        panic: yzzyx
        
        goroutine 1 [running]:
        runtime_test.init.1()
        	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:996 +0x8f
--- FAIL: TestCrashWhileTracing (0.44s)

— watchflakes