Re: WARNING: CPU: 3 PID: 439 at fs/btrfs/ctree.h:1559 btrfs_update_device+0x1c5/0x1d0 [btrfs]

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2017/9/19 下午11:56, Rich Rauenzahn wrote:
> I've filed a bug on this kernel trace -- I get 100's of these a day.
> I'd like to make them go away ....

If you want to solve the problem sooner, then mail list is faster than
kernel bugzilla.

For your case, it's just a warning for unaligned device size, normally
caused by older mkfs or older kernel.

You can fix it by using "btrfs rescue fix-device-size <device>" on a
unmounted fs, or use "btrfs resize <devid>:-4K <mnt>" to resize *each*
device of your mounted fs.

I'd prefer "btrfs rescue fix-device-size <device>" if you have the
latest version of btrfs-progs, as it does not only fix the unaligned
device size, but also fix your super block total bytes.

Thanks,
Qu
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=196949
> 
> [    4.747356] ------------[ cut here ]------------
> [    4.747377] WARNING: CPU: 3 PID: 439 at fs/btrfs/ctree.h:1559
> btrfs_update_device+0x1c5/0x1d0 [btrfs]
> [    4.747377] Modules linked in: nfs_acl lockd grace sunrpc ip_tables
> btrfs xor raid6_pq sd_mod crc32c_intel firewire_ohci igb ahci
>  firewire_core crc_itu_t dca libahci i915 libata i2c_algo_bit e1000e
> drm_kms_helper ptp syscopyarea sysfillrect pps_core sysimgblt f
> b_sys_fops drm video
> [    4.747385] CPU: 3 PID: 439 Comm: btrfs-cleaner Not tainted
> 4.13.2-1.el7.elrepo.x86_64 #1
> [    4.747385] Hardware name: Supermicro X10SAE/X10SAE, BIOS 2.0a 05/09/2014
> [    4.747386] task: ffff88040cdcae80 task.stack: ffffc900021f4000
> [    4.747396] RIP: 0010:btrfs_update_device+0x1c5/0x1d0 [btrfs]
> [    4.747396] RSP: 0018:ffffc900021f7d00 EFLAGS: 00010206
> [    4.747397] RAX: 0000000000000fff RBX: ffff880407b7aa80 RCX: 0000001bc6c71e00
> [    4.747397] RDX: ffff880000000000 RSI: ffff880404cd3f3c RDI: ffff880409417b58
> [    4.747398] RBP: ffffc900021f7d48 R08: 0000000000003f60 R09: ffffc900021f7cb8
> [    4.747398] R10: 0000000000001000 R11: 0000000000000003 R12: ffff88040559f800
> [    4.747398] R13: 0000000000000000 R14: ffff880409417b58 R15: 0000000000003f3c
> [    4.747399] FS:  0000000000000000(0000) GS:ffff88041fac0000(0000)
> knlGS:0000000000000000
> [    4.747399] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    4.747400] CR2: 00007f29c3000248 CR3: 00000004056a4000 CR4: 00000000001406e0
> [    4.747400] Call Trace:
> [    4.747410]  btrfs_remove_chunk+0x2fb/0x8b0 [btrfs]
> [    4.747418]  btrfs_delete_unused_bgs+0x363/0x440 [btrfs]
> [    4.747426]  cleaner_kthread+0x150/0x180 [btrfs]
> [    4.747429]  kthread+0x109/0x140
> [    4.747436]  ? btree_invalidatepage+0xa0/0xa0 [btrfs]
> [    4.747437]  ? kthread_park+0x60/0x60
> [    4.747439]  ret_from_fork+0x25/0x30
> [    4.747439] Code: 10 00 00 00 4c 89 fe e8 8a 30 ff ff 4c 89 f7 e8
> 32 f6 fc ff e9 d3 fe ff ff b8 f4 ff ff ff e9 d4 fe ff ff 0f 1f 00 e8
> bb 2e 9e e0 <0f> ff eb af 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 31 d2
> be 02
> [    4.747450] ---[ end trace 1ef80a625983d73b ]---
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