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From: Giuseppe Della Bianca <bepi@adria.it>
To: linux-btrfs@vger.kernel.org
Subject: Re: [CORRUPTION FILESYSTEM] Corrupted and unrecoverable file system during the snapshot receive
Date: Sun, 18 Dec 2016 20:59:48 +0100
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> Same problem, this time on a local subvolume.
> 
> kernel-4.8.8-100.fc23.x86_64
> 
> btrfs-progs v4.8.5
]zac[

I had three filesystem corruption.

The point at which the problem it appeared, is similar in all three cases.

Subvolume structure and operations sequence:

btrfsreceive/
btrfsreceive/root/
btrfsreceive/root/.part/

1) Sending XYZ differential snapshot in to ' btrfsreceive/root/.part/ '.
2) Create snapshot from ' btrfsreceive/root/.part/XYZ ' to ' btrfsreceive/root 
/XYZ '.
3) Delete snapshot ' btrfsreceive/root/.part/XYZ '.

Always in step 2) I had two files unreadable error (view previous posts), and 
one already existing object error (see below).

All three times I had to re-create from scratch the various partitions (on 
disks and systems different).

I can help you, in some way, to find the problem?

Or is useless to continue report it?



dic 18 18:29:58 exnetold.gdb.it kernel: ------------[ cut here ]------------
dic 18 18:29:58 exnetold.gdb.it kernel: WARNING: CPU: 1 PID: 4325 at 
fs/btrfs/extent-tree.c:2960 btrfs_run_delayed_refs+0x283/0x2b0 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel: BTRFS: Transaction aborted (error -17)
dic 18 18:29:58 exnetold.gdb.it kernel: Modules linked in: fuse xt_CHECKSUM 
ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns 
nf_conntrack_br
dic 18 18:29:58 exnetold.gdb.it kernel:  soundcore acpi_cpufreq tpm_tis 
tpm_tis_core tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc ata_generic 
nouveau vide
dic 18 18:29:58 exnetold.gdb.it kernel: CPU: 1 PID: 4325 Comm: umount Tainted: 
G        W       4.8.8-100.fc23.x86_64 #1
dic 18 18:29:58 exnetold.gdb.it kernel: Hardware name: System manufacturer 
System Product Name/M2N, BIOS 0902    02/16/2009
dic 18 18:29:58 exnetold.gdb.it kernel:  0000000000000286 00000000dd260fac 
ffff8ffa0d25bb60 ffffffffbc3e493e
dic 18 18:29:58 exnetold.gdb.it kernel:  ffff8ffa0d25bbb0 0000000000000000 
ffff8ffa0d25bba0 ffffffffbc0a0ecb
dic 18 18:29:58 exnetold.gdb.it kernel:  00000b9000000049 ffff8ff9e61b40a0 
ffff8ffa2da77800 ffffffffffffffff
dic 18 18:29:58 exnetold.gdb.it kernel: Call Trace:
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc3e493e>] dump_stack+0x63/0x85
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc0a0ecb>] __warn+0xcb/0xf0
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc0a0f4f>] 
warn_slowpath_fmt+0x5f/0x80
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc07eb4e3>] 
btrfs_run_delayed_refs+0x283/0x2b0 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc07d62ec>] ? 
btrfs_cow_block+0x10c/0x1e0 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc07ff62e>] 
commit_cowonly_roots+0xae/0x2e0 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc07eb466>] ? 
btrfs_run_delayed_refs+0x206/0x2b0 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc08706b4>] ? 
btrfs_qgroup_account_extents+0x84/0x180 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc0802187>] 
btrfs_commit_transaction+0x547/0xa40 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc07faa9f>] 
btrfs_commit_super+0x8f/0xa0 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc07fcbcb>] 
close_ctree+0x2db/0x380 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc26d3da>] ? 
evict_inodes+0x15a/0x180
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc07ccf29>] 
btrfs_put_super+0x19/0x20 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc2520bf>] 
generic_shutdown_super+0x6f/0xf0
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc2523b2>] 
kill_anon_super+0x12/0x20
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffc07cdd98>] 
btrfs_kill_super+0x18/0x110 [btrfs]
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc252763>] 
deactivate_locked_super+0x43/0x70
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc2527ec>] 
deactivate_super+0x5c/0x60
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc2711bf>] 
cleanup_mnt+0x3f/0x90
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc271252>] 
__cleanup_mnt+0x12/0x20
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc0bf0ce>] 
task_work_run+0x7e/0xa0
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc0032d2>] 
exit_to_usermode_loop+0xc2/0xd0
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc003bf1>] 
syscall_return_slowpath+0xa1/0xb0
dic 18 18:29:58 exnetold.gdb.it kernel:  [<ffffffffbc7ffb3a>] 
entry_SYSCALL_64_fastpath+0xa2/0xa4
dic 18 18:29:58 exnetold.gdb.it kernel: ---[ end trace f7eb2e818f727168 ]---
dic 18 18:29:58 exnetold.gdb.it kernel: BTRFS: error (device sda3) in 
btrfs_run_delayed_refs:2960: errno=-17 Object already exists
dic 18 18:29:58 exnetold.gdb.it kernel: BTRFS info (device sda3): forced 
readonly
dic 18 18:29:58 exnetold.gdb.it kernel: BTRFS warning (device sda3): Skipping 
commit of aborted transaction.
dic 18 18:29:58 exnetold.gdb.it kernel: BTRFS: error (device sda3) in 
cleanup_transaction:1854: errno=-17 Object already exists
dic 18 18:29:58 exnetold.gdb.it kernel: BTRFS error (device sda3): commit 
super ret -17
dic 18 18:29:58 exnetold.gdb.it kernel: BTRFS error (device sda3): cleaner 
transaction attach returned -30