Public bug reported:
waitid returns 0 PID which is unexpected.
uname -a
Linux ubuntu 5.4.0-24-generic #28-Ubuntu SMP Fri Apr 10 15:33:42 UTC 2020
riscv64 riscv64 riscv64 GNU/Linux
./stress-ng --wait 1
stress-ng: info: [33052] defaulting to a 86400 second (1 day, 0.00 secs) run
per stressor
stress-ng: info: [33052] dispatching hogs: 1 wait
stress-ng: fail: [33053] stress-ng-wait: waitid returned PID 0 but expected
PID 33054
stress-ng: fail: [33053] stress-ng-wait: waitid returned si_signo 0 (signal 0)
but expected SIGCHLD
stress-ng: fail: [33053] stress-ng-wait: waitid returned unexpected si_code 0
stress-ng: fail: [33053] stress-ng-wait: waitid returned PID 0 but expected
PID 33054
stress-ng: fail: [33053] stress-ng-wait: waitid returned si_signo 0 (signal 0)
but expected SIGCHLD
info: 5 failures reached, aborting stress process
stress-ng: fail: [33053] stress-ng-wait: waitid returned unexpected si_code 0
stress-ng: error: [33052] process 33053 (stress-ng-wait) terminated with an
error, exit status=1 (stress-ng core failure)
stress-ng: info: [33052] unsuccessful run completed in 0.07s
The call in stress-ng is just:
wret = waitid(P_PID, pid_r, &info, options);
..and it checks if the info struct is being populated correctly, which
it appears not to and gets a zero'd info struct.
** Affects: linux (Ubuntu)
Importance: Medium
Status: Incomplete
** Tags: focal
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https://bugs.launchpad.net/bugs/1873517
Title:
waitid on riscv64 5.4.0-24-generic is behaving incorrectly
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