From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: Chris Mason <clm@fb.com>, Josef Bacik <jbacik@fb.com>, David Sterba <dsterba@suse.com> Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, Sebastian Andrzej Siewior <bigeasy@linutronix.de> Subject: [PATCH 1/2] btrfs: drop trace_btrfs_all_work_done() from normal_work_helper() Date: Wed, 14 Dec 2016 15:05:29 +0100 [thread overview] Message-ID: <20161214140530.6534-1-bigeasy@linutronix.de> (raw) For btrfs_scrubparity_helper() the ->func() is set to scrub_parity_bio_endio_worker(). This functions invokes scrub_free_parity() which kfrees() the `work' object. All is good as long as trace events are not enabled because we boom with a backtrace like this: | Workqueue: btrfs-endio btrfs_endio_helper | RIP: 0010:[<ffffffff812f81ae>] [<ffffffff812f81ae>] trace_event_raw_even= t_btrfs__work__done+0x4e/0xa0 | Call Trace: | [<ffffffff8136497d>] btrfs_scrubparity_helper+0x59d/0x780 | [<ffffffff81364c49>] btrfs_endio_helper+0x9/0x10 | [<ffffffff8108af8e>] process_one_work+0x26e/0x7b0 | [<ffffffff8108b516>] worker_thread+0x46/0x560 | [<ffffffff81091c4e>] kthread+0xee/0x110 | [<ffffffff818e166a>] ret_from_fork+0x2a/0x40 So in order to avoid this, I remove the trace point. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- fs/btrfs/async-thread.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c index e0f071f6b5a7..d0dfc3d2e199 100644 --- a/fs/btrfs/async-thread.c +++ b/fs/btrfs/async-thread.c @@ -318,8 +318,6 @@ static void normal_work_helper(struct btrfs_work *work) set_bit(WORK_DONE_BIT, &work->flags); run_ordered_work(wq); } - if (!need_order) - trace_btrfs_all_work_done(work); } =20 void btrfs_init_work(struct btrfs_work *work, btrfs_work_func_t uniq_func, --=20 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: Chris Mason <clm@fb.com>, Josef Bacik <jbacik@fb.com>, David Sterba <dsterba@suse.com> Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, Sebastian Andrzej Siewior <bigeasy@linutronix.de> Subject: [PATCH 1/2] btrfs: drop trace_btrfs_all_work_done() from normal_work_helper() Date: Wed, 14 Dec 2016 15:05:29 +0100 [thread overview] Message-ID: <20161214140530.6534-1-bigeasy@linutronix.de> (raw) For btrfs_scrubparity_helper() the ->func() is set to scrub_parity_bio_endio_worker(). This functions invokes scrub_free_parity() which kfrees() the `work' object. All is good as long as trace events are not enabled because we boom with a backtrace like this: | Workqueue: btrfs-endio btrfs_endio_helper | RIP: 0010:[<ffffffff812f81ae>] [<ffffffff812f81ae>] trace_event_raw_event_btrfs__work__done+0x4e/0xa0 | Call Trace: | [<ffffffff8136497d>] btrfs_scrubparity_helper+0x59d/0x780 | [<ffffffff81364c49>] btrfs_endio_helper+0x9/0x10 | [<ffffffff8108af8e>] process_one_work+0x26e/0x7b0 | [<ffffffff8108b516>] worker_thread+0x46/0x560 | [<ffffffff81091c4e>] kthread+0xee/0x110 | [<ffffffff818e166a>] ret_from_fork+0x2a/0x40 So in order to avoid this, I remove the trace point. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- fs/btrfs/async-thread.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c index e0f071f6b5a7..d0dfc3d2e199 100644 --- a/fs/btrfs/async-thread.c +++ b/fs/btrfs/async-thread.c @@ -318,8 +318,6 @@ static void normal_work_helper(struct btrfs_work *work) set_bit(WORK_DONE_BIT, &work->flags); run_ordered_work(wq); } - if (!need_order) - trace_btrfs_all_work_done(work); } void btrfs_init_work(struct btrfs_work *work, btrfs_work_func_t uniq_func, -- 2.11.0
next reply other threads:[~2016-12-14 14:05 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-12-14 14:05 Sebastian Andrzej Siewior [this message] 2016-12-14 14:05 ` [PATCH 1/2] btrfs: drop trace_btrfs_all_work_done() from normal_work_helper() Sebastian Andrzej Siewior 2016-12-14 14:05 ` [PATCH 2/2] btrfs: swap free() and trace point in run_ordered_work() Sebastian Andrzej Siewior 2016-12-14 14:05 ` Sebastian Andrzej Siewior 2016-12-14 14:08 ` [RFC] btrfs: lockdep says "possible recursive locking detected" in btrfs_clear_lock_blocking_rw() Sebastian Andrzej Siewior 2016-12-20 17:26 ` [PATCH 1/2] btrfs: drop trace_btrfs_all_work_done() from normal_work_helper() David Sterba 2016-12-21 0:33 ` Qu Wenruo 2016-12-21 8:28 ` Sebastian Andrzej Siewior 2016-12-21 8:45 ` Qu Wenruo 2016-12-21 8:55 ` Sebastian Andrzej Siewior 2016-12-21 14:08 ` David Sterba
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