linux-kernel - Re: [BUG net-next selftests/pidfd] Hang in ./pidfd_setns_test pidfd_send

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Date: Sat, 9 Mar 2024 15:25:02 +0100
From: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
To: Christian Brauner <brauner@...nel.org>
Cc: Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [BUG net-next selftests/pidfd] Hang in ./pidfd_setns_test
 pidfd_send_signal()

Hi,

There seems to be some additional insight.

Trying to kill the processes so the testsuite might hopefully continue, this was
the result: unkillable (-SIGKILL) processes, which can also not be traced with
strace, and neither the selftest suite continued.

root     1000955    2931  0 01:05 pts/2    00:00:00 ./pidfd_setns_test
root     1000956 1000955 99 01:05 pts/2    14:09:03 [pidfd_setns_tes] <defunct>
root     1037946 1005609  0 15:19 pts/3    00:00:00 grep --color=auto pidfd_setns_tes
root@...iant:/home/marvin/linux/kernel/net-next# strace -p 1000955
strace: Could not attach to process. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf: Operation not permitted
strace: attach: ptrace(PTRACE_SEIZE, 1000955): Operation not permitted
root@...iant:/home/marvin/linux/kernel/net-next# strace -p 1000956
strace: Could not attach to process. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf: Operation not permitted
strace: attach: ptrace(PTRACE_SEIZE, 1000956): Operation not permitted
root@...iant:/home/marvin/linux/kernel/net-next#

Hope this helps.

It would be very interesting to see now what exactly eats 99% of a CPU core, but
I am not enough technologically savvy for this task ATM.

Best regards,
Mirsad Todorovac