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workqueue: Add stall detector sample module

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Add a sample module under samples/workqueue/stall_detector/ that
reproduces a workqueue stall caused by PF_WQ_WORKER misuse.  The
module queues two work items on the same per-CPU pool, then clears
PF_WQ_WORKER and sleeps in wait_event_idle(), hiding from the
concurrency manager and stalling the second work item indefinitely.

This is useful for testing the workqueue watchdog stall diagnostics.

Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Breno Leitao
2026-03-05 08:15:41 -08:00
committed by Tejun Heo
parent 8823eaef45
commit 9e83d5104a
2 changed files with 99 additions and 0 deletions
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samples/workqueue/stall_detector/Makefile Normal file
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obj-m += wq_stall.o