SIGBUS at dart::MarkingVisitorBase<true>::DrainMarkingStack()+0x297

[Hixie]

I got this as a flake(?) on a PR that made no change to any code (https://ci.chromium.org/ui/p/flutter/builders/try/Mac%20Host%20Engine/19979/overview for flutter/engine#23948):

===== CRASH =====
si_signo=Bus error: 10(10), si_code=2, si_addr=0x10bd08140
version=2.12.0-259.0.dev (dev) (Mon Jan 25 20:00:51 2021 -0800) on "macos_x64"
pid=36951, thread=3859, isolate_group=main(0x7fe25602ba00), isolate=(nil)(0x0)
isolate_instructions=109a29e00, vm_instructions=109a29e00
  pc 0x0000000109d91f37 fp 0x0000700007d85db0 dart::MarkingVisitorBase<true>::DrainMarkingStack()+0x297
  pc 0x0000000109d9119a fp 0x0000700007d85e60 dart::ParallelMarkTask::RunEnteredIsolateGroup()+0x9a
  pc 0x0000000109d91a26 fp 0x0000700007d85e90 dart::ParallelMarkTask::Run()+0x36
  pc 0x0000000109d633d8 fp 0x0000700007d85f20 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*)+0x158
  pc 0x0000000109d6369f fp 0x0000700007d85f50 dart::ThreadPool::Worker::Main(unsigned long)+0x6f
  pc 0x0000000109cc7b65 fp 0x0000700007d85fb0 dart::ThreadStart(void*)+0xb5
  pc 0x00007fff729b9109 fp 0x0000700007d85fd0 _pthread_start+0x94
  pc 0x00007fff729b4b8b fp 0x0000700007d85ff0 thread_start+0xf

I have no additional context.

[Hixie]

This is similar to flutter/flutter#72047, though that has a different stack (also in GC though).

[a-siva]

/cc @rmacnak-google

[a-siva]

Marking this class of crashes as duplicates (We seem to have at least 5 of these).
Duplicate of #45792