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| author | Josef Bacik <josef@toxicpanda.com> | 2026-10-28 10:41:22 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-10-28 15:40:34 -0600 |
| commit | 4def096314cf29fb6940b74c087a0b923185580e (patch) | |
| tree | c857cd2196015d25e68ad361ce39c83c2f8e6356 /tools/lib/python | |
| parent | e335b853d919f2c6246ca0993115285742a2acc1 (diff) | |
blk-cgroup: don't free a blkg with its punt work queued
blkg_async_bio_workfn() relies on the bios on the list pinning the blkg.
But blkcg_punt_bio_submit() can call queue_work() after a running
instance already took and completed the bio, and queue_work() succeeds
on an empty list for the same reason. Nothing holds the blkg then, and
free_work shares its memory with async_bio_work on top of that.
Hold a reference across blkcg_punt_bio_submit(), give the two works
memory of their own, and cancel async_bio_work in blkg_free_workfn().
Fixes: d3f77dfdc718 ("blkcg: implement REQ_CGROUP_PUNT")
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://patch.msgid.link/20261028164415.1262013-20-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'tools/lib/python')
0 files changed, 0 insertions, 0 deletions