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af_unix: Annotate data-race of gc_in_progress in wait_for_unix_gc(). 

[ Upstream commit 31e0320711 ]

gc_in_progress is changed under spin_lock(&unix_gc_lock),
but wait_for_unix_gc() reads it locklessly.

Let's use READ_ONCE().

Fixes: 5f23b73496 ("net: Fix soft lockups/OOM issues w/ unix garbage collector")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20240123170856.41348-2-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2024-01-23 09:08:52 -08:00 committed by Sasha Levin
parent a9800dc6cf
commit debbb99874
1 changed files with 1 additions and 1 deletions
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net/unix/garbage.c
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@ -198,7 +198,7 @@ void wait_for_unix_gc(void)
if (READ_ONCE(unix_tot_inflight) > UNIX_INFLIGHT_TRIGGER_GC &&
!READ_ONCE(gc_in_progress))
unix_gc();
wait_event(unix_gc_wait, gc_in_progress == false);
wait_event(unix_gc_wait, !READ_ONCE(gc_in_progress));
}
/* The external entry point: unix_gc() */