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From: Anand Jain <anand.jain@oracle.com>
To: dsterba@suse.cz, David Sterba <dsterba@suse.com>,
	linux-btrfs@vger.kernel.org
Subject: Re: Bug 5.7-rc: lockdep warning, chunk_mutex/device_list_mutex
Date: Wed, 13 May 2020 03:25:42 +0800	[thread overview]
Message-ID: <65c57205-2c42-1e14-f3ea-55e2f7f0b097@oracle.com> (raw)
In-Reply-To: <20200512232827.GI18421@twin.jikos.cz>

On 13/5/2020 7:28 am, David Sterba wrote:
> On Tue, May 12, 2020 at 04:15:46PM +0200, David Sterba wrote:
>> [ 5174.283784] -> #1 (&fs_info->chunk_mutex){+.+.}-{3:3}:
>> [ 5174.286134]        __lock_acquire+0x581/0xae0
>> [ 5174.287563]        lock_acquire+0xa3/0x400
>> [ 5174.289033]        __mutex_lock+0xa0/0xaf0
>> [ 5174.290488]        btrfs_init_new_device+0x316/0x12f0 [btrfs]
>> [ 5174.292209]        btrfs_ioctl+0xc3c/0x2590 [btrfs]
> 
> ioctl called
> 
>> [ 5174.293673]        ksys_ioctl+0x68/0xa0
>> [ 5174.294883]        __x64_sys_ioctl+0x16/0x20
>> [ 5174.296231]        do_syscall_64+0x50/0x210
>> [ 5174.297548]        entry_SYSCALL_64_after_hwframe+0x49/0xb3
>> [ 5174.299278]
>> [ 5174.299278] -> #0 (&fs_devs->device_list_mutex){+.+.}-{3:3}:
>> [ 5174.301760]        check_prev_add+0x98/0xa20
>> [ 5174.303219]        validate_chain+0xa6c/0x29e0
>> [ 5174.304770]        __lock_acquire+0x581/0xae0
>> [ 5174.306274]        lock_acquire+0xa3/0x400
>> [ 5174.307716]        __mutex_lock+0xa0/0xaf0
>> [ 5174.309145]        clone_fs_devices+0x3f/0x170 [btrfs]
>> [ 5174.310757]        read_one_dev+0xc4/0x500 [btrfs]
>> [ 5174.312293]        btrfs_read_chunk_tree+0x202/0x2a0 [btrfs]
>> [ 5174.313946]        open_ctree+0x7a3/0x10db [btrfs]
> 
> ... while the filesystem is being set up. This is actually possible
> because this is with enabled seeding, so the mounted filesystem accesses
> the seeding filesystem's structures when cloning the devices.
> 
> Should be fixed by lifting the device_list_mutex from clone_fs_devices
> to some of it's callers. In btrfs_read_chunk_tree it's between the uuid
> mutex and chunk mutex, in btrfs_init_new_device lock device_list_mutex
> before "if (seeding_dev)".
> 

Two strange things as of now, why we see this only now and mount thread 
is still running but we have the device add ioctl thread.



>> [ 5174.315411]        btrfs_mount_root.cold+0xe/0xcc [btrfs]
>> [ 5174.317122]        legacy_get_tree+0x2d/0x60
>> [ 5174.318543]        vfs_get_tree+0x1d/0xb0
>> [ 5174.319844]        fc_mount+0xe/0x40
>> [ 5174.321122]        vfs_kern_mount.part.0+0x71/0x90
>> [ 5174.322688]        btrfs_mount+0x147/0x3e0 [btrfs]
>> [ 5174.324250]        legacy_get_tree+0x2d/0x60
>> [ 5174.325644]        vfs_get_tree+0x1d/0xb0
>> [ 5174.326978]        do_mount+0x7d5/0xa40
>> [ 5174.328294]        __x64_sys_mount+0x8e/0xd0
>> [ 5174.329829]        do_syscall_64+0x50/0x210
>> [ 5174.331260]        entry_SYSCALL_64_after_hwframe+0x49/0xb3


  reply	other threads:[~2020-05-13  3:26 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-12 14:12 Pending bugs for 5.7 David Sterba
2020-05-12 14:14 ` Bug 5.7-rc: root leak, eb leak David Sterba
2020-05-12 23:03   ` David Sterba
2020-05-13 11:54     ` Johannes Thumshirn
2020-05-13 11:57       ` Qu Wenruo
2020-05-13 12:06         ` Johannes Thumshirn
2020-05-13 12:11           ` Qu Wenruo
2020-05-13 12:17             ` Johannes Thumshirn
2020-05-13 12:29               ` Johannes Thumshirn
2020-05-12 14:15 ` Bug 5.7-rc: write-time leaf corruption detected David Sterba
2020-05-12 14:26   ` Filipe Manana
2020-05-13  3:10   ` Qu Wenruo
2020-05-13  3:17     ` Qu Wenruo
2020-05-13  9:25     ` Filipe Manana
2020-05-19 14:26   ` Bug 5.7-rc: write-time leaf corruption detected (fixed) David Sterba
2020-05-12 14:15 ` Bug 5.7-rc: lockdep warning, chunk_mutex/device_list_mutex David Sterba
2020-05-12 23:28   ` David Sterba
2020-05-12 19:25     ` Anand Jain [this message]
2020-05-13 19:46   ` [PATCH] btrfs: fix lockdep warning chunk_mutex vs device_list_mutex Anand Jain
2020-05-15 17:40     ` David Sterba
2020-05-16  3:43       ` Anand Jain
2020-05-18 11:07         ` Anand Jain
2020-05-18 15:28           ` David Sterba
2020-05-12 14:15 ` Bug 5.7-rc: lockdep warning, fs_reclaim David Sterba

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