Re: Transaction aborted in btrfs_rename2

[Jeff Mahoney <jeffm@suse.com>]

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On 6/6/16 7:47 AM, Adam Borowski wrote:
> Hi!
> I just got this thrice, in 4.7-rc1 and 4.7-rc2:
> 
> [ 1836.672368] ------------[ cut here ]------------
> [ 1836.672382] WARNING: CPU: 1 PID: 16348 at fs/btrfs/inode.c:9820 btrfs_rename2+0xcd2/0x2a50
> [ 1836.672385] BTRFS: Transaction aborted (error -2)
> [ 1836.672387] Modules linked in: nvidia(PO) usb_storage
> [ 1836.672396] CPU: 1 PID: 16348 Comm: gcc-6 Tainted: P           O    4.7.0-rc2-debug+ #3
> [ 1836.672399] Hardware name: System manufacturer System Product Name/M4A77T, BIOS 2401    05/18/2011
> [ 1836.672402]  ffffffff81f8b504 ffff880062c47c78 ffffffff8165be6d 0000000000000007
> [ 1836.672407]  ffff880062c47cd0 0000000000000000 ffff880062c47cc0 ffffffff81110c1c
> [ 1836.672411]  ffff880062c47d20 0000265c814e8642 0000000000000000 0000000000a25ade
> [ 1836.672415] Call Trace:
> [ 1836.672423]  [<ffffffff8165be6d>] dump_stack+0x4e/0x71
> [ 1836.672429]  [<ffffffff81110c1c>] __warn+0x10c/0x150
> [ 1836.672433]  [<ffffffff81110caa>] warn_slowpath_fmt+0x4a/0x50
> [ 1836.672437]  [<ffffffff814f4842>] btrfs_rename2+0xcd2/0x2a50
> [ 1836.672443]  [<ffffffff814dfcfb>] ? btrfs_permission+0x5b/0xc0
> [ 1836.672448]  [<ffffffff81d288c8>] ? down_write+0x18/0x60
> [ 1836.672453]  [<ffffffff8133a0cc>] vfs_rename+0x7cc/0xc30
> [ 1836.672457]  [<ffffffff8133dc8b>] SyS_rename+0x32b/0x420
> [ 1836.672461]  [<ffffffff81d2ab9f>] entry_SYSCALL_64_fastpath+0x17/0x93
> [ 1836.672464] ---[ end trace 6405b6e3d0e6c945 ]---
> [ 1836.672468] BTRFS warning (device sda1): btrfs_rename:9820: Aborting unused transaction(No such entry).
> [ 1836.675505] BTRFS warning (device sda1): btrfs_rename:9820: Aborting unused transaction(No such entry).
> <repeated 1152 times>
> [ 1837.935238] BTRFS warning (device sda1): btrfs_rename:9820: Aborting unused transaction(No such entry).
> [ 1837.937602] BTRFS: error (device sda1) in btrfs_rename:9820: errno=-2 No such entry
> [ 1837.937607] BTRFS info (device sda1): forced readonly
> [ 1838.086754] BTRFS warning (device sda1): Skipping commit of aborted transaction.
> [ 1838.086762] BTRFS: error (device sda1) in cleanup_transaction:1857: errno=-2 No such entry
> [ 1838.086782] BTRFS info (device sda1): delayed_refs has NO entry
> 
> Didn't trigger during a week of other work, yet a kernel compile triggers
> this reliably.
> 
> Filesystem appears consistent (btrfs check, scrub).
> Mount options: noatime,compress=lzo,ssd,space_cache.
> 

Oh, interesting.  We're seeing this on our 4.4-based kernels as well but
only on arm64.  That it's triggering on x86_64 is a good data point.
I'm hunting this one today.

-Jeff

-- 
Jeff Mahoney
SUSE Labs


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