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SubjectRe: [PATCH] block: revert pushing the final release of request_queue to a workqueue.
On 2020-02-06 03:10, yu kuai wrote:
> syzbot is reporting use after free bug in debugfs_remove[1].
> This is because in request_queue, 'q->debugfs_dir' and
> 'q->blk_trace->dir' could be the same dir. And in __blk_release_queue(),
> blk_mq_debugfs_unregister() will remove everything inside the dir.

Hi Yu,

Have you already noticed patch "[PATCH] blktrace: Protect q->blk_trace
with RCU"? If not, have you already tried to verify whether that patch
fixes the use-after-free detected by syzbot? See also



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