runtime: TestSegv failures in race mode on darwin

[prattmic]

This is a new consistent failure on darwin race builders. https://go.dev/cl/643897 started running TestSegv (and other testprog tests) in -race mode for the first time.

https://ci.chromium.org/ui/p/golang/builders/ci/gotip-darwin-arm64-race/b8714420763090571297/test-results?sortby=&groupby=

This test is fine in race mode on Linux, but on Darwin we seem to have some problem unwinding.

runtime: newstack sp=0x16d1e69a0 stack=[0xc00003e000, 0xc00003e800]
        	morebuf={pc:0x102dac62c sp:0x16d1e69a0 lr:0x0}
        	sched={pc:0x102c913fc sp:0x16d1e69a0 lr:0x102dac62c ctxt:0x0}
        runtime: gp=0xc0000828c0, goid=19, gp->status=0x2
         runtime: split stack overflow: 0x16d1e69a0 < 0xc00003e000
        fatal error: runtime: split stack overflow
        
        runtime stack:
        runtime.throw({0x102df1816?, 0x102c54044?})
        	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:1089 +0x34 fp=0x16d1e68c0 sp=0x16d1e6890 pc=0x102c8f784
        runtime.newstack()
        	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/stack.go:1052 +0x588 fp=0x16d1e69f0 sp=0x16d1e68c0 pc=0x102c75148
        runtime.morestack()
        	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:392 +0x70 fp=0x16d1e69f0 sp=0x16d1e69f0 pc=0x102c953b0
        
        goroutine 19 gp=0xc0000828c0 m=0 mp=0x102f9dc40 [running]:
        runtime.sigpanic()
        	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/signal_unix.go:906 +0x35c fp=0x16d1e69a0 sp=0x16d1e69a0 pc=0x102c913fc
        runtime: g 19: unexpected return pc for runtime.sigpanic called from 0x102dac62c
        stack: frame={sp:0x16d1e69a0, fp:0x16d1e69a0} stack=[0xc00003e000,0xc00003e800)
        
        created by main.SegvInCgo in goroutine 1
        	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/testdata/testprogcgo/segv.go:21 +0x94

[prattmic]

This is easy to reproduce by running ./testprog Segv on a gomote. Other failure modes I've seen:

traceback: unexpected SPWRITE function racecall                       
fatal error: traceback                                                                                                                                 
                                                                           
runtime stack:                                                      
runtime.throw({0x104776beb?, 0x1046e06b0?})
        /usr/local/google/home/mpratt/src/go/src/runtime/panic.go:1089 +0x34 fp=0x16b7daf10 sp=0x16b7daee0 pc=0x1046d7ff4       
runtime.(*unwinder).resolveInternal(0x16b7db068, 0x0?, 0x1?)
        /usr/local/google/home/mpratt/src/go/src/runtime/traceback.go:365 +0x308 fp=0x16b7daf90 sp=0x16b7daf10 pc=0x1046c8bc8   
runtime.(*unwinder).next(0x16b7db068)
        /usr/local/google/home/mpratt/src/go/src/runtime/traceback.go:513 +0x148 fp=0x16b7db020 sp=0x16b7daf90 pc=0x1046c8d58
runtime.copystack(0xc000003500, 0x1000)
        /usr/local/google/home/mpratt/src/go/src/runtime/stack.go:935 +0x2b8 fp=0x16b7db120 sp=0x16b7db020 pc=0x1046c0158    
runtime.newstack()                        
        /usr/local/google/home/mpratt/src/go/src/runtime/stack.go:1117 +0x354 fp=0x16b7db250 sp=0x16b7db120 pc=0x1046c05e4
runtime.morestack()
        /usr/local/google/home/mpratt/src/go/src/runtime/asm_arm64.s:392 +0x70 fp=0x16b7db250 sp=0x16b7db250 pc=0x1046dd670

[gopherbot]

Change https://go.dev/cl/674276 mentions this issue: runtime: disable TestSegv in race mode

[gabyhelp]

Related Issues

• runtime: "morestack on g0" in TestSegv on darwin-amd64 builders #39457
• runtime: "unexpected return pc for runtime.sigpanic" on darwin-amd64-10_11 builder #34039 (closed)
• runtime/race: sigsegv when using cgo callbacks with the race detector enabled #10874 (closed)
• runtime: "unexpected return pc for runtime.pthread_kill_trampoline" on darwin builders #37605 (closed)
• runtime: SIGSEGV from runtime.(*timersBucket).addtimerLocked on darwin/arm64 #24790 (closed)
• runtime: SIGSEGV during gcenable on darwin-arm64-corellium #34908 (closed)
• runtime: unexpected return pc for runtime.sigtramp on darwin/arm64 builder #29305 (closed)
• runtime/debug: SIGSEGV in dumpgoroutine #35172 (closed)
• runtime: TestSegv fails with the latest tip version #49192 (closed)
• runtime: TestSegv/SegvInCgo failure with `unexpected return pc for runtime.casgstatus` on linux/arm #51353 (closed)

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