5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Gleixner <tglx@kernel.org>
commit c793bbfc4a0a9f5a66978fc91559e9681748dbeb upstream.
When timers are migrated away from an offline CPU the debugobjects state
gets corrupted. The timer is accounted as inactive on deletion, but the
enqueue on the alive CPU lacks the activation call.
That used to work, but got broken when the trace point and the debug
objects call got separated. That change missed to fixup
migrate_timer_list().
Add the missing debug_timer_activate() invocation to fix it.
Fixes: dc1e7dc5ac62 ("timer: Move trace point to get proper index")
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Cc: <redacted>
Link: https://patch.msgid.link/87bjb0l7ha.ffs@fw13 (local)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
kernel/time/timer.c | 1 +
1 file changed, 1 insertion(+)
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -2173,6 +2173,7 @@ static void migrate_timer_list(struct ti
timer = hlist_entry(head->first, struct timer_list, entry);
detach_timer(timer, false);
timer->flags = (timer->flags & ~TIMER_BASEMASK) | cpu;
+ debug_timer_activate(timer);
internal_add_timer(new_base, timer);
}
}