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. 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 ]---
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