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

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