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From: Anand Jain <anand.jain@oracle.com>
To: linux-btrfs@vger.kernel.org
Cc: josef@toxicpanda.com, dsterba@suse.cz, fdmanana@gmail.com
Subject: [PATCH] btrfs: drop lockdep assert in close_fs_devices()
Date: Thu, 23 Sep 2021 11:58:32 +0800	[thread overview]
Message-ID: <94f69f0215f06ecf929c66249810c549e492071c.1632368499.git.anand.jain@oracle.com> (raw)
In-Reply-To: <4f7529acd33594df9b0b06f7011d8cd4d195fc29.1627419595.git.josef@toxicpanda.com>

btrfs/225, btrfs/164  reports warning due to a lockdep assertion failure:

[ 5343.002752] ------------[ cut here ]------------
[ 5343.002756] WARNING: CPU: 3 PID: 797246 at fs/btrfs/volumes.c:1165
close_fs_devices+0x200/0x220 [btrfs]

[ 5343.002933] Call Trace:
[ 5343.002938]  btrfs_rm_device.cold+0x147/0x1c0 [btrfs]
[ 5343.002981]  btrfs_ioctl+0x2dc2/0x3460 [btrfs]
[ 5343.003021]  ? __do_sys_newstat+0x48/0x70
[ 5343.003028]  ? lock_is_held_type+0xe8/0x140
[ 5343.003034]  ? __x64_sys_ioctl+0x83/0xb0
[ 5343.003037]  __x64_sys_ioctl+0x83/0xb0
[ 5343.003042]  do_syscall_64+0x3b/0xc0
[ 5343.003045]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 5343.003048] RIP: 0033:0x7fe125a17d87

The patch [1] removed uuid_mutex in btrfs_rm_device(). So now there is no
uuid_mutex in the call chain leading to close_fs_devices() that has
lockdep_assert_held(uuid_mutex).

 [1]  [PATCH v2 2/7] btrfs: do not take the uuid_mutex in btrfs_rm_device

The lockdep_assert_held(uuid_mutex) in close_fs_devices() was added by the
commit 425c6ed6486f (btrfs: do not hold device_list_mutex when closing
devices) as it found that device_list_mutex in close_fs_devices() was
redundant.

In the current code the lockdep_assert_held(uuid_mutex) in close_fs_devices()
in incorrect, remove it.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
David,
  Pls feel free to either roll this into the patch "[PATCH v2 2/7] btrfs: do not
  take the uuid_mutex in btrfs_rm_device" or merge it as an independent patch.
 
 fs/btrfs/volumes.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 9fea27b9f9be..ac4a9f349932 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1162,8 +1162,6 @@ static void close_fs_devices(struct btrfs_fs_devices *fs_devices)
 {
 	struct btrfs_device *device, *tmp;
 
-	lockdep_assert_held(&uuid_mutex);
-
 	if (--fs_devices->opened > 0)
 		return;
 
-- 
2.31.1


  parent reply	other threads:[~2021-09-23  3:59 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27 21:01 [PATCH v2 0/7] Josef Bacik
2021-07-27 21:01 ` [PATCH v2 1/7] btrfs: do not call close_fs_devices in btrfs_rm_device Josef Bacik
2021-09-01  8:13   ` Anand Jain
2021-07-27 21:01 ` [PATCH v2 2/7] btrfs: do not take the uuid_mutex " Josef Bacik
2021-09-01 12:01   ` Anand Jain
2021-09-01 17:08     ` David Sterba
2021-09-01 17:10     ` Josef Bacik
2021-09-01 19:49       ` Anand Jain
2021-09-02 12:58   ` David Sterba
2021-09-02 14:10     ` Josef Bacik
2021-09-17 14:33       ` David Sterba
2021-09-20  7:45   ` Anand Jain
2021-09-20  8:26     ` David Sterba
2021-09-20  9:41       ` Anand Jain
2021-09-23  4:33         ` Anand Jain
2021-09-21 11:59   ` Filipe Manana
2021-09-21 12:17     ` Filipe Manana
2021-09-22 15:33       ` Filipe Manana
2021-09-23  4:15         ` Anand Jain
2021-09-23  3:58   ` Anand Jain [this message]
2021-09-23  4:04     ` [PATCH] btrfs: drop lockdep assert in close_fs_devices() Anand Jain
2021-07-27 21:01 ` [PATCH v2 3/7] btrfs: do not read super look for a device path Josef Bacik
2021-08-25  2:00   ` Anand Jain
2021-09-27 15:32     ` Josef Bacik
2021-09-28 11:50       ` Anand Jain
2021-07-27 21:01 ` [PATCH v2 4/7] btrfs: update the bdev time directly when closing Josef Bacik
2021-08-25  0:35   ` Anand Jain
2021-09-02 12:16   ` David Sterba
2021-07-27 21:01 ` [PATCH v2 5/7] btrfs: delay blkdev_put until after the device remove Josef Bacik
2021-08-25  1:00   ` Anand Jain
2021-09-02 12:16   ` David Sterba
2021-07-27 21:01 ` [PATCH v2 6/7] btrfs: unify common code for the v1 and v2 versions of " Josef Bacik
2021-08-25  1:19   ` Anand Jain
2021-09-01 14:05   ` Nikolay Borisov
2021-07-27 21:01 ` [PATCH v2 7/7] btrfs: do not take the device_list_mutex in clone_fs_devices Josef Bacik
2021-08-24 22:08   ` Anand Jain
2021-09-01 13:35   ` Nikolay Borisov
2021-09-02 12:59   ` David Sterba
2021-09-17 15:06 ` [PATCH v2 0/7] David Sterba

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