Bug 1666724 Comment 13 Edit History

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Original comment by
on 
It seems this can also be occur from the compilations dispatched by ChromeScriptLoader as well.  I was able to reproduce one of those crashes on try coincidentally:
```
[task 2020-11-16T17:30:57.045Z] 17:30:57  WARNING -  PROCESS-CRASH | xpcshell-remote.ini:toolkit/components/extensions/test/xpcshell/test_ext_contentscript_async_loading.js | application crashed [@ NS_DispatchToMainThread(already_AddRefed<nsIRunnable>&&, unsigned int)]
[task 2020-11-16T17:30:57.046Z] 17:30:57     INFO -  Crash dump filename: /tmp/xpc-other-M0qQpX/06521011-38c8-0e46-4150-cb03267b8068.dmp
[task 2020-11-16T17:30:57.046Z] 17:30:57     INFO -  Operating system: Linux
[task 2020-11-16T17:30:57.047Z] 17:30:57     INFO -                    0.0.0 Linux 4.4.0-1014-aws #14taskcluster1-Ubuntu SMP Tue Apr 3 10:27:00 UTC 2018 x86_64
[task 2020-11-16T17:30:57.047Z] 17:30:57     INFO -  CPU: amd64
[task 2020-11-16T17:30:57.047Z] 17:30:57     INFO -       family 6 model 85 stepping 4
[task 2020-11-16T17:30:57.048Z] 17:30:57     INFO -       2 CPUs
[task 2020-11-16T17:30:57.048Z] 17:30:57     INFO -  GPU: UNKNOWN
[task 2020-11-16T17:30:57.049Z] 17:30:57     INFO -  Crash reason:  SIGSEGV /SEGV_MAPERR
[task 2020-11-16T17:30:57.049Z] 17:30:57     INFO -  Crash address: 0x0
[task 2020-11-16T17:30:57.050Z] 17:30:57     INFO -  Process uptime: not available
[task 2020-11-16T17:30:57.051Z] 17:30:57     INFO -  Thread 4 (crashed)
[task 2020-11-16T17:30:57.051Z] 17:30:57     INFO -   0  plugin-container!mozalloc_abort 
...
...
...
[task 2020-11-16T17:30:57.063Z] 17:30:57     INFO -   5  libxul.so!OffThreadScriptLoaderCallback(JS::OffThreadToken*, void*) [ChromeScriptLoader.cpp:5c6b4a59452f787bb0012febf43a0d04472d51a6 : 133 + 0x2c]
[task 2020-11-16T17:30:57.063Z] 17:30:57     INFO -      rbx = 0x00007f46d3dfdf70   rbp = 0x00007f46d3dfdfa0
[task 2020-11-16T17:30:57.064Z] 17:30:57     INFO -      rsp = 0x00007f46d3dfdf60   r12 = 0x0000000000000000
[task 2020-11-16T17:30:57.064Z] 17:30:57     INFO -      r13 = 0x0000000000000000   r14 = 0x00007f46d3dfdf60
[task 2020-11-16T17:30:57.064Z] 17:30:57     INFO -      r15 = 0x00007f46d3dfdf68   rip = 0x00007f46eb107481
[task 2020-11-16T17:30:57.064Z] 17:30:57     INFO -      Found by: call frame info```

So this may also need a shutdown observer to cancel off thread compilations.
Revision 1 by
on 
It seems this can also be occur from the compilations dispatched by ChromeScriptLoader as well.  I was able to reproduce one of those crashes on try coincidentally:
```
[task 2020-11-16T17:30:57.045Z] 17:30:57  WARNING -  PROCESS-CRASH | xpcshell-remote.ini:toolkit/components/extensions/test/xpcshell/test_ext_contentscript_async_loading.js | application crashed [@ NS_DispatchToMainThread(already_AddRefed<nsIRunnable>&&, unsigned int)]
[task 2020-11-16T17:30:57.046Z] 17:30:57     INFO -  Crash dump filename: /tmp/xpc-other-M0qQpX/06521011-38c8-0e46-4150-cb03267b8068.dmp
[task 2020-11-16T17:30:57.046Z] 17:30:57     INFO -  Operating system: Linux
[task 2020-11-16T17:30:57.047Z] 17:30:57     INFO -                    0.0.0 Linux 4.4.0-1014-aws #14taskcluster1-Ubuntu SMP Tue Apr 3 10:27:00 UTC 2018 x86_64
[task 2020-11-16T17:30:57.047Z] 17:30:57     INFO -  CPU: amd64
[task 2020-11-16T17:30:57.047Z] 17:30:57     INFO -       family 6 model 85 stepping 4
[task 2020-11-16T17:30:57.048Z] 17:30:57     INFO -       2 CPUs
[task 2020-11-16T17:30:57.048Z] 17:30:57     INFO -  GPU: UNKNOWN
[task 2020-11-16T17:30:57.049Z] 17:30:57     INFO -  Crash reason:  SIGSEGV /SEGV_MAPERR
[task 2020-11-16T17:30:57.049Z] 17:30:57     INFO -  Crash address: 0x0
[task 2020-11-16T17:30:57.050Z] 17:30:57     INFO -  Process uptime: not available
[task 2020-11-16T17:30:57.051Z] 17:30:57     INFO -  Thread 4 (crashed)
[task 2020-11-16T17:30:57.051Z] 17:30:57     INFO -   0  plugin-container!mozalloc_abort 
...
...
...
[task 2020-11-16T17:30:57.063Z] 17:30:57     INFO -   5  libxul.so!OffThreadScriptLoaderCallback(JS::OffThreadToken*, void*) [ChromeScriptLoader.cpp:5c6b4a59452f787bb0012febf43a0d04472d51a6 : 133 + 0x2c]
[task 2020-11-16T17:30:57.063Z] 17:30:57     INFO -      rbx = 0x00007f46d3dfdf70   rbp = 0x00007f46d3dfdfa0
[task 2020-11-16T17:30:57.064Z] 17:30:57     INFO -      rsp = 0x00007f46d3dfdf60   r12 = 0x0000000000000000
[task 2020-11-16T17:30:57.064Z] 17:30:57     INFO -      r13 = 0x0000000000000000   r14 = 0x00007f46d3dfdf60
[task 2020-11-16T17:30:57.064Z] 17:30:57     INFO -      r15 = 0x00007f46d3dfdf68   rip = 0x00007f46eb107481
[task 2020-11-16T17:30:57.064Z] 17:30:57     INFO -      Found by: call frame info
```

So this may also need a shutdown observer to cancel off thread compilations.

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