6.12-stable review patch. If anyone has any objections, please let me know.
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From: Gao Xiang hsiangkao@linux.alibaba.com
[ Upstream commit 1a2180f6859c73c674809f9f82e36c94084682ba ]
Max Kellermann recently reported psi_group_cpu.tasks[NR_MEMSTALL] is incorrect in the 6.11.9 kernel.
The root cause appears to be that, since the problematic commit, bio can be NULL, causing psi_memstall_leave() to be skipped in z_erofs_submit_queue().
Reported-by: Max Kellermann max.kellermann@ionos.com Closes: https://lore.kernel.org/r/CAKPOu+8tvSowiJADW2RuKyofL_CSkm_SuyZA7ME5vMLWmL6pq... Fixes: 9e2f9d34dd12 ("erofs: handle overlapped pclusters out of crafted images properly") Reviewed-by: Chao Yu chao@kernel.org Signed-off-by: Gao Xiang hsiangkao@linux.alibaba.com Link: https://lore.kernel.org/r/20241127085236.3538334-1-hsiangkao@linux.alibaba.c... Signed-off-by: Sasha Levin sashal@kernel.org --- fs/erofs/zdata.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index a569ff9dfd04..1a00f061798a 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -1679,9 +1679,9 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f, erofs_fscache_submit_bio(bio); else submit_bio(bio); - if (memstall) - psi_memstall_leave(&pflags); } + if (memstall) + psi_memstall_leave(&pflags);
/* * although background is preferred, no one is pending for submission.