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Bug
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Resolution: Unresolved
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Normal
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None
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rhel-9.8
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None
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No
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Moderate
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rhel-kernel-rts-time
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ssg_core_kernel
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13
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False
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False
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No
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None
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None
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None
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Unspecified Release Note Type - Unknown
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Unspecified
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Unspecified
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Unspecified
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All
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None
The queue_track backend has been observed to experience stalling during an exit.
How to reproduce:
- Start stalld on CPU 0: taskset -c 0 stalld -v -b queue_track
- Start an RT, high priority, CPU bound task on CPU 1: taskset -c 1 chrt -f 90 bash -c 'while :; do :; done' &
- Kill stalld by either typing CTRL-c or kill $(pgrep stalld) from another terminal.
- Observe the stalld process hangs.
- Kill the RT process and stalld exists.
- This is the stalld process kernel stack trace while it is hanging:
[root@dell-per450-03 test]# cat /proc/$(pgrep stalld)/stack [<0>] __wait_rcu_gp+0x116/0x120 [<0>] synchronize_rcu_tasks_rude+0x4e/0xc0 [<0>] ftrace_shutdown.part.0+0xd1/0x1c0 [<0>] unregister_ftrace_function+0x44/0x150 [<0>] unregister_ftrace_direct_multi+0x46/0x90 [<0>] bpf_trampoline_update+0x444/0x4e0 [<0>] bpf_trampoline_unlink_prog+0x7c/0xf0 [<0>] bpf_tracing_link_release+0x12/0x40 [<0>] bpf_link_free+0x54/0xd0 [<0>] bpf_link_release+0x17/0x20 [<0>] __fput+0x91/0x250 [<0>] __x64_sys_close+0x38/0x80 [<0>] do_syscall_64+0x5c/0xe0 [<0>] entry_SYSCALL_64_after_hwframe+0x76/0x7e
- is cloned by
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- In Progress
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