I don't see a stack for this crash in the log, but I also. Am I just missing it? There's an ASAN SEGV stack, but from 15 minutes after this test failure, afaict.
No clue, sorry. I think this line a few lines up from line 5101 means it is the SEGV issue? 02:40:25 INFO - ==5870==AddressSanitizer CHECK failed: /builds/slave/moz-toolchain/src/llvm/projects/compiler-rt/lib/sanitizer_common/sanitizer_common.h:336 "((i)) < ((size_))" (0x8ea4, 0x8ea4)
Ah, right you are. That's a ... wholly uninformative line. :(
Bulk assigning P3 to all open intermittent bugs without a priority set in Firefox components per bug 1298978.