Assertion failure in find_holes during record

[Keno]

https://buildkite.com/julialang/julia-master/builds/35035#018e807f-e934-4187-a6d1-294631bd1a79

[FATAL src/record_syscall.cc:5763:find_holes() errno: EXDEV]
 (task 808 (rec:808) at time 469522)
 -> Assertion `data > hole' failed to hold. Found data at 4456448 which should be after hole 4456448; file end 7684096, data offset 4456448
[INFO log_pending_events()] SYSCALL: mmap
[INFO log_pending_events()] (none)
[FATAL src/log.cc:444:emergency_debug()] (session doesn't look interactive, aborting emergency debugging)

I'm not sure what the kernel's guarantees on SEEK_HOLE are and whether holes are allowed to be zero size, but that is what the assert seems to be indicating.

[rocallahan]

Is it possible that something else is writing to the file concurrently with the tracee?