Broken Pipe errors on JerryScript

[bzyo]

On JerryScript, the following error occurs somewhat frequently:

Script execution failed: Failed to send command to child process: Broken pipe. Retrying in 1 second...

[WilliamParks]

I have encountered the same issue intermittently with Spidermonkey as well. My initial guess is that it's due to short reads, but I haven't investigated further.

[saelo]

Thanks for the report. That would mean it fails here:

fuzzilli/Sources/libreprl/libreprl.c

Line 345 in 8a7f4f3

return reprl_error(ctx, "Failed to send command to child process: %s", strerror(errno));

My guess is that this is the result of the child process dying (e.g. due to the OOM killer or if a background thread of the js shell crashes) while waiting for the next REPRL command. Then this would be the first place where the parent notices, since the pipe has now (unexpectedly) closed. Maybe we can add some code before this line to check if the child is still alive (e.g. through waitpid) and if it died, print some more information (e.g. stderr). But probably there isn't much more we can do, and Fuzzilli will also just retry the execution, so it shouldn't be much of an issue in any case

[saelo]

I added better logging to libreprl: bd2135d
Let me know if the you still encounter the "Script execution failed" messages or if they have now become "Child unexpectedly exited/terminated" messages now (and in that case, please also include the exit code/signal number)

[bzyo]

I've seen just the new error of "Child unexpectedly terminated with signal 11 between executions" by itself and then also followed by the original error posted here.

[Limesss]

I've seen just the new error of "Child unexpectedly terminated with signal 11 between executions" by itself and then also followed by the original error posted here.

hi,did u solved it ? i hava the same question in the lastest jerry version