runtime: TestLockRankGenerated failures

[gopherbot]

#!watchflakes
default <- pkg == "runtime" && test == "TestLockRankGenerated"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestLockRankGenerated
    lockrank_test.go:22: /home/swarming/.swarming/w/ir/x/w/goroot/bin/go run mklockrank.go: exit status 2
        SIGSEGV: segmentation violation
        PC=0x568c0 m=7 sigcode=1 addr=0xc0
        
        goroutine 0 gp=0x3f384041c0 m=7 mp=0x3f38400008 [idle]:
        runtime.preemptone(0x3f384041c0?)
        	runtime/proc.go:6310 +0x38 fp=0x3f38393f28 sp=0x3f38393f10 pc=0x568c0
        runtime.preemptall()
        	runtime/proc.go:6288 +0x60 fp=0x3f38393f50 sp=0x3f38393f28 pc=0x56860
...
        a5  0x188284dd	a6  0x29aab9e2
        a7  0x1d237	s2  0x3f38393ed0
        s3  0x3f38400008	s4  0x3f38406000
        s5  0x3f3819c4c0	s6  0x72
        s7  0x6e	s8  0x3f3804d288
        s9  0x3f38393fa0	s10 0x6c9398
        s11 0x3f384041c0	t3  0x1825dc84d6eac6
        t4  0xffffffffffffffff	t5  0x29af020ec57
        t6  0x1	pc  0x568c0
--- FAIL: TestLockRankGenerated (0.18s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime" && test == "TestLockRankGenerated"

2024-08-14 20:56 gotip-linux-riscv64 go@370a6959 runtime.TestLockRankGenerated (log)

=== RUN   TestLockRankGenerated
    lockrank_test.go:22: /home/swarming/.swarming/w/ir/x/w/goroot/bin/go run mklockrank.go: exit status 2
        SIGSEGV: segmentation violation
        PC=0x568c0 m=7 sigcode=1 addr=0xc0
        
        goroutine 0 gp=0x3f384041c0 m=7 mp=0x3f38400008 [idle]:
        runtime.preemptone(0x3f384041c0?)
        	runtime/proc.go:6310 +0x38 fp=0x3f38393f28 sp=0x3f38393f10 pc=0x568c0
        runtime.preemptall()
        	runtime/proc.go:6288 +0x60 fp=0x3f38393f50 sp=0x3f38393f28 pc=0x56860
...
        a5  0x188284dd	a6  0x29aab9e2
        a7  0x1d237	s2  0x3f38393ed0
        s3  0x3f38400008	s4  0x3f38406000
        s5  0x3f3819c4c0	s6  0x72
        s7  0x6e	s8  0x3f3804d288
        s9  0x3f38393fa0	s10 0x6c9398
        s11 0x3f384041c0	t3  0x1825dc84d6eac6
        t4  0xffffffffffffffff	t5  0x29af020ec57
        t6  0x1	pc  0x568c0
--- FAIL: TestLockRankGenerated (0.18s)

— watchflakes

[mknyszek]

@golang/riscv64

This looks like memory corruption or something, probably not actually a problem with this specific test.

[prattmic]

Same looking crash in https://ci.chromium.org/ui/p/golang/builders/ci/gotip-linux-riscv64/b8739023503796888129/test-results?sortby=&groupby=.

[prattmic]

And https://logs.chromium.org/logs/golang/buildbucket/cr-buildbucket/8739403364771438801/+/u/step/19/log/2.

This seems to be a regular failure on the linux-riscv64 builder.

[mengzhuo]

All these failures are trying to access 0xc0

SIGSEGV: segmentation violation
        PC=0x56870 m=6 sigcode=1 addr=0xc0

I will take a look.

[mengzhuo]

Related to #68862 , Closed