misc/cgo/test: linux-amd64-alpine: "fatal error: unknown caller pc" in gentraceback

[heschi]

2022-08-19T17:46:05-4a954fa/linux-amd64-alpine
2022-08-19T16:04:12-f15761b/linux-amd64-alpine
2022-08-19T03:09:05-a409356/linux-amd64-alpine
2022-08-19T03:01:14-55ecc3a/linux-amd64-alpine

scatter = 0x56df81
runtime: g 38: unexpected return pc for runtime.ensureSigM.func1 called from 0x0
stack: frame={sp:0xc0001db758, fp:0xc0001db7e0} stack=[0xc0001db000,0xc0001db800)
0x000000c0001db658:  0x0000000000000002  0x0000000000000000 
0x000000c0001db668:  0x0000000000000000  0x0000000000700160 
0x000000c0001db678:  0x000000000043f296 <runtime.gopark+0x00000000000000d6>  0x0000000000000000 
0x000000c0001db688:  0x000000c00002ca00  0x0000000000000010 
0x000000c0001db698:  0x0000000000000001  0x0000000000000001 
0x000000c0001db6a8:  0x0000000000000002  0x000000c000184d00 
0x000000c0001db6b8:  0x0000000000000004  0x000000c00019a280 
0x000000c0001db6c8:  0x000000c0001db7a4  0x000000c000184ea0 
0x000000c0001db6d8:  0x000000c00019a240  0x000000c0001803c0 
0x000000c0001db6e8:  0x000000c000180360  0x000000c000180360 
0x000000c0001db6f8:  0x000000c000184fe8  0x000000c000184f28 
0x000000c0001db708:  0x000000c000184fe8  0x0000000000450220 <runtime.selectgo.func2+0x0000000000000000> 
0x000000c0001db718:  0x000000c0001db748  0x000000000040cb1d <runtime.chansend1+0x000000000000001d> 
0x000000c0001db728:  0x000000c000180300  0x000000c0001db78f 
0x000000c0001db738:  0x0000000000000001  0x0000000000000002 
0x000000c0001db748:  0x000000c0001db7d0  0x00000000004694f0 <runtime.ensureSigM.func1+0x00000000000001b0> 
0x000000c0001db758: <0x000000c0001db7a8  0x000000c0001db7a0 
0x000000c0001db768:  0x0000000000000000  0x0000000000000000 
0x000000c0001db778:  0x000000c0001db7a8  0x000000000040cb01 <runtime.chansend1+0x0000000000000001> 
0x000000c0001db788:  0x010000c0001802a0  0x00000002005ece60 
0x000000c0001db798:  0xfffffffc3bbe3b00  0x0001000000000001 
0x000000c0001db7a8:  0x000000c000180360  0x000000c0001db790 
0x000000c0001db7b8:  0x00007f24312e16fa  0x00007f2409d13b74 
0x000000c0001db7c8:  0x0000000000000000  0x0000000000000000 
0x000000c0001db7d8: !0x0000000000000000 >0xffffffffffffffff 
0x000000c0001db7e8:  0x00007f24312e0cf5  0x0000000000000000 
0x000000c0001db7f8:  0x0000000000000000 
fatal error: unknown caller pc

cc @golang/runtime

[bcmills]

This may be related to #54422.

[prattmic]

I suspect this is related to #39857. I previously added some test skips, but perhaps missed a few.

[bcmills]

Several related failure modes, but none since 2022-08-19. @prattmic, do we think this is fixed now?

greplogs -l -e \\Alinux-.\*-alpine\(\?:.\*\\n\)\*runtime\\.throw\(\?:.+\\n\\t.+\\n\)+runtime\\.gentraceback
2022-08-19T18:39:56-bf4e35b/linux-amd64-alpine
2022-08-19T17:46:05-4a954fa/linux-amd64-alpine
2022-08-19T16:04:12-f15761b/linux-amd64-alpine
2022-08-19T03:09:05-a409356/linux-amd64-alpine
2022-08-19T03:01:14-55ecc3a/linux-amd64-alpine
2022-08-18T21:54:52-0a4a57d/linux-amd64-alpine
2022-08-18T21:54:10-9ad7720/linux-amd64-alpine
2022-08-18T16:15:06-c7c78f1/linux-amd64-alpine
2022-08-18T02:23:10-83b223e/linux-amd64-alpine
2022-08-16T20:39:44-e49e876/linux-amd64-alpine
2022-08-12T16:38:52-f001df5/linux-amd64-alpine
2022-08-12T01:51:51-449691b/linux-amd64-alpine
2022-08-10T17:44:57-522f0fc/linux-amd64-alpine
2022-08-09T21:26:45-d39b541/linux-amd64-alpine
2022-08-08T20:38:29-ced4d6f/linux-amd64-alpine
2022-08-08T14:10:19-964f0c7/linux-amd64-alpine
2022-08-04T18:27:30-39728f4/linux-amd64-alpine

[prattmic]

Yes, likely fixed by https://go.dev/cl/425001.

That test was corrupting random goroutine stacks, hence why it could cause crashes afterwards, when the bad test is no longer running.