* [PATCH] btrfs: don't call destroy_workqueue on NULL workqueues
@ 2022-04-28 12:53 Christoph Hellwig
2022-04-28 15:02 ` David Sterba
0 siblings, 1 reply; 2+ messages in thread
From: Christoph Hellwig @ 2022-04-28 12:53 UTC (permalink / raw)
To: dsterba; +Cc: josef, linux-btrfs, syzbot+a2c720e0f056114ea7c6
Unlike the btrfs_workueue code, the kernel workqueues don't like their
cleaup function called on a NULL pointer, so add checks for them.
Fixes: a5eec25648da ("btrfs: use a normal workqueue for rmw_workers")
Reported-by: syzbot+a2c720e0f056114ea7c6@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: syzbot+a2c720e0f056114ea7c6@syzkaller.appspotmail.com
---
fs/btrfs/disk-io.c | 3 ++-
fs/btrfs/scrub.c | 9 ++++++---
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 307230436ecd6..fd8d91947d3fc 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2283,7 +2283,8 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
btrfs_destroy_workqueue(fs_info->workers);
btrfs_destroy_workqueue(fs_info->endio_workers);
btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
- destroy_workqueue(fs_info->rmw_workers);
+ if (fs_info->rmw_workers)
+ destroy_workqueue(fs_info->rmw_workers);
btrfs_destroy_workqueue(fs_info->endio_write_workers);
btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
btrfs_destroy_workqueue(fs_info->delayed_workers);
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index a614ddde8c624..3985225f27be5 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -3967,9 +3967,12 @@ static void scrub_workers_put(struct btrfs_fs_info *fs_info)
fs_info->scrub_parity_workers = NULL;
mutex_unlock(&fs_info->scrub_lock);
- destroy_workqueue(scrub_workers);
- destroy_workqueue(scrub_wr_comp);
- destroy_workqueue(scrub_parity);
+ if (scrub_workers)
+ destroy_workqueue(scrub_workers);
+ if (scrub_wr_comp)
+ destroy_workqueue(scrub_wr_comp);
+ if (scrub_parity)
+ destroy_workqueue(scrub_parity);
}
}
--
2.30.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] btrfs: don't call destroy_workqueue on NULL workqueues
2022-04-28 12:53 [PATCH] btrfs: don't call destroy_workqueue on NULL workqueues Christoph Hellwig
@ 2022-04-28 15:02 ` David Sterba
0 siblings, 0 replies; 2+ messages in thread
From: David Sterba @ 2022-04-28 15:02 UTC (permalink / raw)
To: Christoph Hellwig
Cc: dsterba, josef, linux-btrfs, syzbot+a2c720e0f056114ea7c6
On Thu, Apr 28, 2022 at 05:53:41AM -0700, Christoph Hellwig wrote:
> Unlike the btrfs_workueue code, the kernel workqueues don't like their
> cleaup function called on a NULL pointer, so add checks for them.
>
> Fixes: a5eec25648da ("btrfs: use a normal workqueue for rmw_workers")
> Reported-by: syzbot+a2c720e0f056114ea7c6@syzkaller.appspotmail.com
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Tested-by: syzbot+a2c720e0f056114ea7c6@syzkaller.appspotmail.com
Thanks, folded to the patches.
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -2283,7 +2283,8 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
> btrfs_destroy_workqueue(fs_info->workers);
> btrfs_destroy_workqueue(fs_info->endio_workers);
> btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
> - destroy_workqueue(fs_info->rmw_workers);
> + if (fs_info->rmw_workers)
> + destroy_workqueue(fs_info->rmw_workers);
This is in "btrfs: use a normal workqueue for rmw_workers"
> btrfs_destroy_workqueue(fs_info->endio_write_workers);
> btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
> btrfs_destroy_workqueue(fs_info->delayed_workers);
> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
> index a614ddde8c624..3985225f27be5 100644
> --- a/fs/btrfs/scrub.c
> +++ b/fs/btrfs/scrub.c
> @@ -3967,9 +3967,12 @@ static void scrub_workers_put(struct btrfs_fs_info *fs_info)
> fs_info->scrub_parity_workers = NULL;
> mutex_unlock(&fs_info->scrub_lock);
>
> - destroy_workqueue(scrub_workers);
> - destroy_workqueue(scrub_wr_comp);
> - destroy_workqueue(scrub_parity);
> + if (scrub_workers)
> + destroy_workqueue(scrub_workers);
> + if (scrub_wr_comp)
> + destroy_workqueue(scrub_wr_comp);
> + if (scrub_parity)
> + destroy_workqueue(scrub_parity);
And this from "btrfs: use normal workqueues for scrub"
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-04-28 12:53 [PATCH] btrfs: don't call destroy_workqueue on NULL workqueues Christoph Hellwig
2022-04-28 15:02 ` David Sterba
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