On 16.08.2018 11:07, Qu Wenruo wrote: > > > On 2018/8/16 下午3:51, David Goodwin wrote: >> I've just spotted this on one server. >> >> Running : umount /backups && mount /backups >> >> seems to allow it to become r/w again, but it does write : >> >> BTRFS error (device xvdj): cleaner transaction attach returned -30 >> >> to 'dmesg'. >> >> >> David. >> >> ------------[ cut here ]------------ >> >> BTRFS: Transaction aborted (error -28) >> WARNING: CPU: 3 PID: 992 at fs/btrfs/extent-tree.c:7004 > > Looks like some tree block backref mismatch. Nope, -28 is ENOSPC. I think this is the problem that Josef sent some patches - ie. when running delayed refs puts too much pressure during transaction commit and it's no possible to satisfy this. Unfortunately those patches haven't been merged. > > Would you please try "btrfs check --readonly <device>" to see if it > reports any error? > > Thanks, > Qu > >> __btrfs_free_extent.isra.63+0x3d2/0xd20 >> Modules linked in: dm_mod dax ipt_REJECT nf_reject_ipv4 nfsv3 >> ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 >> nf_defrag_ipv4 nf_nat_ipv4 nf_nat_ftp nf_conntrack_ftp nf_nat >> nf_conntrack libcrc32c xt_multiport iptable_filter ip_tables x_tables >> autofs4 nfsd auth_rpcgss nfs_acl nfs lockd grace fscache sunrpc >> intel_rapl crct10dif_pclmul crc32_pclmul ghash_clmulni_intel evdev pcbc >> snd_pcsp snd_pcm aesni_intel snd_timer aes_x86_64 crypto_simd snd >> glue_helper cryptd soundcore xen_netfront xen_blkfront crc32c_intel >> CPU: 3 PID: 992 Comm: btrfs-transacti Not tainted 4.16.17-dg1 #1 >> RIP: e030:__btrfs_free_extent.isra.63+0x3d2/0xd20 >> RSP: e02b:ffffc9004290bc68 EFLAGS: 00010292 >> RAX: 0000000000000026 RBX: 00000180c5538000 RCX: 0000000000000006 >> RDX: 0000000000000007 RSI: 0000000000000001 RDI: ffff88039a996650 >> RBP: 00000000ffffffe4 R08: 0000000000000001 R09: 0000000000001d80 >> R10: 0000000000000001 R11: 0000000000001d80 R12: ffff880392d64000 >> R13: ffff880251fedcb0 R14: 0000000000000000 R15: 0000000000000002 >> FS: 0000000000000000(0000) GS:ffff88039a980000(0000) >> knlGS:0000000000000000 >> CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00007fdee11425c0 CR3: 00000002d3700000 CR4: 0000000000000660 >> Call Trace: >> ? btrfs_merge_delayed_refs+0x23c/0x3c0 >> __btrfs_run_delayed_refs+0x320/0x1180 >> btrfs_run_delayed_refs+0x105/0x1c0 >> btrfs_commit_transaction+0x393/0x8a0 >> ? wait_woken+0x80/0x80 >> transaction_kthread+0x195/0x1b0 >> kthread+0xf8/0x130 >> ? btrfs_cleanup_transaction+0x540/0x540 >> ? kthread_create_worker_on_cpu+0x50/0x50 >> ret_from_fork+0x35/0x40 >> Code: 48 8b 04 24 48 8b 40 50 f0 48 0f ba a8 d0 16 00 00 02 72 19 83 fd >> fb 0f 84 07 03 00 00 89 ee 48 c7 c7 30 f3 d9 81 e8 2e a6 d7 ff <0f> 0b >> 48 8b 3c 24 89 e9 ba 5c 1b 00 00 48 c7 c6 80 86 c3 81 e8 >> ---[ end trace c83740faa277d833 ]--- >
