rcu-tasks: Dump rtpcp->lazy_timer status in show_rcu_tasks_generic_gp_kthread()

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Add 'P' flag to the diagnostic line to indicate whether any per-cpu
rtpcp's lazy_timer is pending.  this helps diagnose stalls where
rcu-task callbacks are queued but the kthread stay sleep because
the lazy_timer has not yet fired and no grace period has started.

The output is as follows:

[   31.319540][   T77] call_rcu_tasks() has failed boot-time tests.
[   31.320205][   T77] rcu_tasks: RTGS_WAIT_CBS(11) since 7518 g:4 i:0 kCuUP l:150000

Signed-off-by: Zqiang <qiang.zhang@linux.dev>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

...

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Zqiang 2026-07-16 17:57:54 +08:00 • committed by Paul E. McKenney

parent 5976694882

commit 7a455d3cae

1 changed files with 6 additions and 2 deletions

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kernel/rcu/tasks.h

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