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[tor-bugs] #13291 [Tor]: Fix spawn test failures due to race condition with process exiting early
#13291: Fix spawn test failures due to race condition with process exiting early
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Reporter: teor | Owner:
Type: defect | Status: new
Priority: normal | Milestone:
Component: Tor | Version: Tor: unspecified
Keywords: | Actual Points:
Parent ID: | Points:
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When a spawned process forks, fails, then exits very quickly, (this
typically occurs when exec fails), there is a race condition between the
SIGCHLD handler updating the process_handle's fields, and checking the
process status in those fields. The update can occur before or after the
tests check the process status.
This causes intermittent failures in the test spawn_background_fail(),
typically when the machine is under load. I've created a patch that checks
whether the process is running or not running (rather than just checking
if it is running) to avoid this issue.
I'll submit a github branch once I have the bug number for the changes
file name.
tor version: 2.6.0-alpha-dev
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13291>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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