Filed by: nerli [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=416695982&repo=mozilla-central
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Ym5vYvXJRPGfrS1MQrNkHQ/runs/0/artifacts/public/logs/live_backing.log

[task 2023-05-23T11:35:35.274Z] 11:35:35     INFO - PROCESS-CRASH | Shutdown hanging at step CCPostLastCycleCollection. Something is blocking the main-thread. [@ mozilla::nsTerminator::AdvancePhase] | dom/tests/mochitest/dom-level2-core/test_systemId01.html (finished) 
[task 2023-05-23T11:35:35.274Z] 11:35:35     INFO - Mozilla crash reason: Shutdown hanging at step CCPostLastCycleCollection. Something is blocking the main-thread.
[task 2023-05-23T11:35:35.274Z] 11:35:35     INFO - Crash dump filename: C:\Users\task_168484059575562\AppData\Local\Temp\tmpqjt2b7x4.mozrunner\minidumps\4aea4551-f707-4c51-b290-c28860127bd9.dmp
[task 2023-05-23T11:35:35.274Z] 11:35:35     INFO - Operating system: Windows NT
[task 2023-05-23T11:35:35.274Z] 11:35:35     INFO -                   10.0.22621
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - CPU: amd64
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      family 6 model 85 stepping 7
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      8 CPUs
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - 
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - Crash reason:  EXCEPTION_BREAKPOINT
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - Crash address: 0x7ff88255320b
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - Crashing instruction: `int 0x3`
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - No memory accessed by instruction
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - Process uptime: 280 seconds
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - 
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO - Thread 15 Shutdown Hang Terminator (crashed)
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -  0  xul.dll!mozilla::nsTerminator::AdvancePhase(mozilla::ShutdownPhase) + 0x5cb
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      rax = 0x0000023281013040    rdx = 0x00000232810334e2
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      rcx = 0x00007ff8986b8ee0    rbx = 0x00000232f136fa30
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      rsi = 0x000000000000000b    rdi = 0x000000df7343f6d8
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      rbp = 0x0000000000000000    rsp = 0x000000df7343f6a0
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -       r8 = 0x0000000000000000     r9 = 0x8101010101010100
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      r10 = 0x7efefcf0f8fefcfe    r11 = 0x0000023281013040
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      r12 = 0x00007ff896177460    r13 = 0x00000232f136fa00
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      r14 = 0x000002328388ab38    r15 = 0x00007ff8c0311680
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      rip = 0x00007ff88255320b
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -     Found by: given as instruction pointer in context
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -  1  nss3.dll!PR_NativeRunThread + 0x168
[task 2023-05-23T11:35:35.278Z] 11:35:35     INFO -      rbx = 0x00000232f136fa30    rsi = 0x000002328388aa00
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rdi = 0x00007ff89614d709    rbp = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rsp = 0x000000df7343f700    r12 = 0x00007ff896177460
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      r13 = 0x00000232f136fa00    r14 = 0x000002328388ab38
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      r15 = 0x00007ff8c0311680    rip = 0x00007ff895fcdf29
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -     Found by: call frame info
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -  2  nss3.dll!PR_MD_CREATE_THREAD + 0xc7
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rbx = 0x0000023282b80c90    rsi = 0x0000023282b80c90
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rdi = 0x0000000000000000    rbp = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rsp = 0x000000df7343f770    r12 = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      r13 = 0x0000000000000000    r14 = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      r15 = 0x0000000000000000    rip = 0x00007ff895fba818
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -     Found by: call frame info
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -  3  ucrtbase.dll!thread_start<unsigned int (__cdecl*)(void *),1> + 0x92
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rbx = 0x0000023282b80c90    rbp = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rsp = 0x000000df7343f7a0    r12 = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      r13 = 0x0000000000000000    r14 = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      r15 = 0x0000000000000000    rip = 0x00007ff8bdc19363
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -     Found by: call frame info
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -  4  kernel32.dll!BaseThreadInitThunk + 0x1c
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rbx = 0x0000023282b80c90    rbp = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      rsp = 0x000000df7343f7d0    r12 = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      r13 = 0x0000000000000000    r14 = 0x0000000000000000
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -      r15 = 0x0000000000000000    rip = 0x00007ff8bf86269d
[task 2023-05-23T11:35:35.279Z] 11:35:35     INFO -     Found by: call frame info
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -  5  mozglue.dll!DllBlocklist_Initialize(unsigned int) + 0x577
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      rbx = 0x00007ff8bdc192d0    rsi = 0x0000023282b80c90
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      rdi = 0x0000000000000000    rbp = 0x0000000000000000
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      rsp = 0x000000df7343f800    r12 = 0x0000000000000000
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      r13 = 0x0000000000000000    r14 = 0x0000000000000000
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      r15 = 0x0000000000000000    rip = 0x00007ff8985ee138
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -     Found by: call frame info
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -  6  ntdll.dll!RtlUserThreadStart + 0x27
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      rbx = 0x0000000000000000    rsi = 0x0000000000000000
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      rdi = 0x0000000000000000    rbp = 0x0000000000000000
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      rsp = 0x000000df7343f870    r12 = 0x0000000000000000
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      r13 = 0x0000000000000000    r14 = 0x0000000000000000
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -      r15 = 0x0000000000000000    rip = 0x00007ff8c034a9f8
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -     Found by: call frame info
[task 2023-05-23T11:35:35.280Z] 11:35:35     INFO -