runtime: stack corruption on freebsd/arm

[mknyszek]

#!watchflakes
post <- goos == "freebsd" && goarch == "arm" && log ~ `fatal error: unknown caller pc`

CC @golang/freebsd

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- goos == "freebsd" && goarch == "arm" && log ~ `fatal error: unknown caller pc`

2023-08-21 17:53 freebsd-arm-paulzhol net@9cde5a08 go@e7e99a8e (log)

runtime: g 1: unexpected return pc for bootstrap/cmd/compile/internal/noder.(*pkgWriter).typeAndValue called from 0x294b7124
stack: frame={sp:0x298fed90, fp:0x298fedec} stack=[0x298f8000,0x29900000)
0x298fed10:  0x00000000  0x41440c2e  0x00000000  0x41f00000 
0x298fed20:  0x1bad4acf  0x3fd2fac5  0xbc31d5e9  0x3fd283a8 
0x298fed30:  0x00000000  0x41486a00  0x00000000  0x00000000 
0x298fed40:  0x00000000  0x41cdcd65  0xc0000000  0x415e3c85 
0x298fed50:  0x25c9140d  0x3fd6ad45  0x00000000  0x3fe00000 
0x298fed60:  0x00000000  0x00000000  0x00000000  0x00000000 
0x298fed70:  0x00000000  0x00000000  0x00000000  0x00000000 
0x298fed80:  0x0028185c <bootstrap/cmd/compile/internal/abt.(*node32).aDeleteMax+0x00000008>  0x00000000  0x006cb53c <bootstrap/cmd/compile/internal/noder.(*pkgWriter).maybeTypeAndValue+0x00000030>  0x006cb400 <bootstrap/cmd/compile/internal/noder.(*pkgWriter).typeAndValue+0x00000040> 
...
fatal error: unknown caller pc

runtime stack:
runtime.throw({0x7d42ee, 0x11})
	/tmp/workdir-host-freebsd-arm-paulzhol/go/src/runtime/panic.go:1047 +0x4c fp=0x29443b8c sp=0x29443b78 pc=0x51d2c
runtime.gentraceback(0xffffffff, 0xffffffff, 0x0, 0x294020f0, 0x0, 0x0, 0x7fffffff, 0x29443edc, 0x0, 0x0)
	/tmp/workdir-host-freebsd-arm-paulzhol/go/src/runtime/traceback.go:270 +0x183c fp=0x29443d90 sp=0x29443b8c pc=0x7e150
runtime.scanstack(0x294020f0, 0x2942a95c)
	/tmp/workdir-host-freebsd-arm-paulzhol/go/src/runtime/mgcmark.go:804 +0x1fc fp=0x29443ee8 sp=0x29443d90 pc=0x35024
runtime.markroot.func1()
...
runtime.markroot(0x2942a95c, 0x7, 0x1)
	/tmp/workdir-host-freebsd-arm-paulzhol/go/src/runtime/mgcmark.go:213 +0x234 fp=0x29443f70 sp=0x29443f14 pc=0x3346c
runtime.gcDrain(0x2942a95c, 0x3)
	/tmp/workdir-host-freebsd-arm-paulzhol/go/src/runtime/mgcmark.go:1069 +0x58c fp=0x29443fb8 sp=0x29443f70 pc=0x35eb0
runtime.gcBgMarkWorker.func2()
	/tmp/workdir-host-freebsd-arm-paulzhol/go/src/runtime/mgc.go:1348 +0xb8 fp=0x29443fe4 sp=0x29443fb8 pc=0x30b18
runtime.systemstack()
	/tmp/workdir-host-freebsd-arm-paulzhol/go/src/runtime/asm_arm.s:317 +0x60 fp=0x29443fe8 sp=0x29443fe4 pc=0x87a04

go tool dist: FAILED: /tmp/workdir-host-freebsd-arm-paulzhol/go/pkg/tool/freebsd_arm/compile -std -pack -o /tmp/workdir-host-freebsd-arm-paulzhol/tmp/go-tool-dist-1856047159/regexp/syntax/_go_.a -p regexp/syntax -importcfg /tmp/workdir-host-freebsd-arm-paulzhol/tmp/go-tool-dist-1856047159/regexp/syntax/importcfg /tmp/workdir-host-freebsd-arm-paulzhol/go/src/regexp/syntax/compile.go /tmp/workdir-host-freebsd-arm-paulzhol/go/src/regexp/syntax/doc.go /tmp/workdir-host-freebsd-arm-paulzhol/go/src/regexp/syntax/op_string.go /tmp/workdir-host-freebsd-arm-paulzhol/go/src/regexp/syntax/parse.go /tmp/workdir-host-freebsd-arm-paulzhol/go/src/regexp/syntax/perl_groups.go /tmp/workdir-host-freebsd-arm-paulzhol/go/src/regexp/syntax/prog.go /tmp/workdir-host-freebsd-arm-paulzhol/go/src/regexp/syntax/regexp.go /tmp/workdir-host-freebsd-arm-paulzhol/go/src/regexp/syntax/simplify.go: exit status 2

— watchflakes