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Invalid PID when trying to kill BackgroundCommand #693
Description
I have started a background task as follows:
self._process = self._target.background(f"poller -l {','.join([str(x) for x in self._files.keys()])} {' '.join(self._files.values())}", as_root=self._as_root)
When I then try to run:
self._process.cancel()
I see the following error:
Command '/home/appa/devlib-target/bin/busybox kill -15 -329893' returned non-zero exit status 1.
OUTPUT: kill: can't kill pid -329893: No such process
Checking on the device I can see that the PID does exist:
root 329893 0.0 0.0 2060 500 ? S 10:44 0:00 sh -c sh -c 'export PATH=/home/appa/devlib-target/bin:$PATH && export LC_ALL=C && poller -l 0 /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq'
root 329894 0.0 0.0 2060 472 ? S 10:44 0:00 sh -c export PATH=/home/appa/devlib-target/bin:$PATH && export LC_ALL=C && poller -l 0 /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
root 329895 0.0 0.0 936 4 ? S 10:44 0:00 poller -l 0 /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
appa 330021 0.0 0.0 8576 648 pts/0 S+ 10:45 0:00 grep --color=auto poller
It seems the issue is the preceding -, if I run the command manually without it (/home/appa/devlib-target/bin/busybox kill -15 329893) the process is killed as expected
Activity
[-]Invalid PID wheb trying to kill BackgroundCommand[/-][+]Invalid PID when trying to kill BackgroundCommand[/+]ep1cman commentedon Jun 14, 2024
It seems that when it is being wrapped by sudo, the PID returned is not the PGID.
The PID sent to the kill command in this case was
373748, but you can see the PGID is actually373747which is the the outer sudo calldouglas-raillard-arm commentedon Jul 26, 2024
Interesting, thanks for reporting.
In case someone has the same idea, this PR #689 does not provide a workaround, since SIGTERM, SIGQUIT and SIGKILL are still handled in the same way as currently.