Invalid argument to `process_mrelease`

I recently encountered an oom situation in which earlyoom itself failed, requiring a poweroff to fix. System logs prior to the poweroff reveal that earlyoom invoked `process_mrelease` incorrectly. I've omitted the command line of the process due to its length, but I wouldn't expect it to cause the issue: ``` Nov 12 17:08:27 earlyoom[1295]: mem avail: 888 of 55597 MiB ( 1.60%), swap free: 0 of 8191 MiB ( 0.00%) Nov 12 17:08:27 earlyoom[1295]: low memory! at or below SIGTERM limits: mem 1.66%, swap 10.00% Nov 12 17:08:27 earlyoom[1295]: sending SIGTERM to process 906175 uid 1000 "java": oom_score 1170, VmRSS 43912 MiB, cmdline "..." Nov 12 17:08:27 earlyoom[1295]: kill_release: pid=906175: process_mrelease pidfd=4 failed: Invalid argument Nov 12 17:08:37 earlyoom[1295]: process 906175 did not exit Nov 12 17:08:37 earlyoom[1295]: kill failed: Timer expired Nov 12 17:08:37 earlyoom[1295]: mem avail: 896 of 55599 MiB ( 1.61%), swap free: 0 of 8191 MiB ( 0.00%) Nov 12 17:08:37 earlyoom[1295]: low memory! at or below SIGTERM limits: mem 1.66%, swap 10.00% Nov 12 17:08:37 earlyoom[1295]: sending SIGTERM to process 906175 uid 1000 "java": oom_score 1170, VmRSS 43912 MiB, cmdline "..." Nov 12 17:08:37 earlyoom[1295]: kill_release: pid=906175: process_mrelease pidfd=4 failed: Invalid argument Nov 12 17:08:47 earlyoom[1295]: process 906175 did not exit Nov 12 17:08:47 earlyoom[1295]: kill failed: Timer expired Nov 12 17:08:47 earlyoom[1295]: mem avail: 892 of 55595 MiB ( 1.61%), swap free: 0 of 8191 MiB ( 0.00%) Nov 12 17:08:47 earlyoom[1295]: low memory! at or below SIGTERM limits: mem 1.66%, swap 10.00% Nov 12 17:08:47 earlyoom[1295]: sending SIGTERM to process 906175 uid 1000 "java": oom_score 1170, VmRSS 43912 MiB, cmdline "..." Nov 12 17:08:47 earlyoom[1295]: kill_release: pid=906175: process_mrelease pidfd=4 failed: Invalid argument Nov 12 17:08:57 earlyoom[1295]: process 906175 did not exit Nov 12 17:08:57 earlyoom[1295]: kill failed: Timer expired ```