Hi Sean, Hi All,
this may be because of the issue described here:
http://forum.world.st/Difficult-to-debug-VM-crash-with-full-blocks-and-Sista-V1-tt5103810.html
This issue is characterized by the system crashing soon after start up when
some significant i/o is done, typically either to files or sockets. It affects
macOS only and may indeed affect only 64-bits. We have strong evidence that it
is caused by the dynamic linker being invoked in the signal handler for SIGIO
when the signal is delivered while the VM is executing JITted code. The
symptom that causes the crash is corruption of a particular jitted method’s
machine code, eg Delay class>>#startEventLoop, and we believe that the
corruption is caused by the linker when it misinterprets a jitted Smalltalk
stack frame as an ABI-compliant stack frame and attempts to scan code to link
it.
Our diagnosis is speculative; this is extremely hard to reproduce. Typically
in repeating a crashing run SIGIO may no longer be delivered at the same point
because any remote server has now woken up and delivers results sooner, etc.
However, Nicolas Cellier and I are both confident that we have correctly
identified the bug.
The fix is simple; SIGIO should be delivered on a dedicated signal stack (see
sigaltstack(2)). I committed a fix yesterday evening and we should see within
a week or so if these crashes have disappeared.
I encourage the Pharo vm maintainers to build and release vms that include
https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/c24970eb2859a474065c6f69060c0324aef2b211
asap.
Cheers,
Eliot
_,,,^..^,,,_ (phone)
> On Oct 3, 2019, at 1:24 PM, Sean P. DeNigris <[email protected]> wrote:
>
> Segmentation fault Thu Oct 3 15:52:33 2019
>
>
> VM: 201901051900 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
> Date: Sat Jan 5 20:00:11 2019 CommitHash: 7a3c6b6
> Plugins: 201901051900 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
>
> C stack backtrace & registers:
> rax 0x0000000124380000 rbx 0x00007ffeebd00050 rcx 0x0000000000468260 rdx
> 0x0000000000dd6800
> rdi 0x0000000124cee5a0 rsi 0x0000000124cee5a0 rbp 0x00007ffeebcffe50 rsp
> 0x00007ffeebcffe50
> r8 0x00007fff3f2cefe5 r9 0x0000000000000b00 r10 0x0000000000006000 r11
> 0xfffffffffcd8d5a0
> r12 0x0000000000000002 r13 0x0000000035800000 r14 0x00007ffeebd00064 r15
> 0x0000000000002800
> rip 0x00007fff630f7d09
> 0 libsystem_platform.dylib 0x00007fff630f7d09
> _platform_memmove$VARIANT$Haswell + 41
> 1 Pharo 0x0000000103f52642 reportStackState
> + 952
> 2 Pharo 0x0000000103f52987 sigsegv + 174
> 3 libsystem_platform.dylib 0x00007fff630fab3d _sigtramp + 29
> 4 ??? 0x0000058900000a00 0x0 +
> 6085968660992
> 5 libGLImage.dylib 0x00007fff3f2ce29e
> glgProcessPixelsWithProcessor + 2149
> 6 AMDRadeonX5000GLDriver 0x000000010db16db1 glrATIStoreLevels
> + 1600
> 7 AMDRadeonX5000GLDriver 0x000000010db52c83
> glrAMD_GFX9_LoadSysTextureStandard + 45
> 8 AMDRadeonX5000GLDriver 0x000000010db519bb glrUpdateTexture
> + 1346
> 9 libGPUSupportMercury.dylib 0x00007fff5181279d
> gpusLoadCurrentTextures + 591
> 10 AMDRadeonX5000GLDriver 0x000000010db5a099 gldUpdateDispatch
> + 397
> 11 GLEngine 0x00007fff3ff72078
> gleDoDrawDispatchCore + 629
> 12 GLEngine 0x00007fff3ff16369
> glDrawArraysInstanced_STD_Exec + 264
> 13 GLEngine 0x00007fff3ff1625a
> glDrawArrays_UnpackThread + 40
> 14 GLEngine 0x00007fff3ff6dce1 gleCmdProcessor +
> 77
> 15 libdispatch.dylib 0x00007fff62ec2dcf
> _dispatch_client_callout + 8
> 16 libdispatch.dylib 0x00007fff62ecea2c
> _dispatch_lane_barrier_sync_invoke_and_complete + 60
> 17 GLEngine 0x00007fff3fec4b85
> glFlush_ExecThread + 15
> 18 Pharo 0x0000000103f4cc62
> -[sqSqueakOSXOpenGLView drawRect:flush:] + 314
> 19 Pharo 0x0000000103f4cb22 -
> ...
>
> Smalltalk stack dump:
> 0x7ffeebd14238 M DelaySemaphoreScheduler>unscheduleAtTimingPriority
> 0x10fab3ad0: a(n) DelaySemaphoreScheduler
> 0x7ffeebd14270 M [] in
> DelaySemaphoreScheduler(DelayBasicScheduler)>runBackendLoopAtTimingPriority
> 0x10fab3ad0: a(n) DelaySemaphoreScheduler
> 0x1125923f8 s BlockClosure>ensure:
> 0x111e88d30 s
> DelaySemaphoreScheduler(DelayBasicScheduler)>runBackendLoopAtTimingPriority
> 0x112590a50 s [] in
> DelaySemaphoreScheduler(DelayBasicScheduler)>startTimerEventLoopPriority:
> 0x111e88e08 s [] in BlockClosure>newProcess
>
> Most recent primitives
> @
> actualScreenSize
> millisecondClockValue
> tempAt:
>
>
>
> -----
> Cheers,
> Sean
> --
> Sent from: http://forum.world.st/Pharo-Smalltalk-Developers-f1294837.html
>
