Il giorno mar 8 gen 2019 alle ore 00:11 Filipe Manana <fdman...@gmail.com> ha scritto:
]zac[ > > [ 1558.056931] Call Trace: > > [ 1558.057011] __btrfs_run_delayed_refs+0x216/0x10b0 [btrfs] > > [ 1558.057011] ? btrfs_free_tree_block+0x82/0x2c0 [btrfs] > > [ 1558.057011] btrfs_run_delayed_refs+0x78/0x180 [btrfs] > > [ 1558.057011] btrfs_should_end_transaction+0x3e/0x60 [btrfs] > > [ 1558.057011] btrfs_drop_snapshot+0x3cf/0x820 [btrfs] > > [ 1558.057011] ? btree_submit_bio_start+0x20/0x20 [btrfs] > > [ 1558.057011] btrfs_clean_one_deleted_snapshot+0xba/0xe0 [btrfs] > > [ 1558.057011] cleaner_kthread+0x129/0x160 [btrfs] > > [ 1558.057011] kthread+0x112/0x130 > > [ 1558.057011] ? kthread_create_worker_on_cpu+0x70/0x70 > > [ 1558.057011] ret_from_fork+0x35/0x40 > > [ 1558.057011] Code: 10 48 8b 40 50 f0 48 0f ba a8 30 23 00 00 02 0f 92 c0 > > 41 > > 59 84 c0 0f 85 cc a4 09 00 44 89 ee 48 c7 c7 98 9e 75 c0 e8 58 33 a0 e7 <0f> > > 0b e9 b6 a4 09 00 48 89 df e8 bf 0c ff ff 49 8b 74 24 28 4d > > [ 1558.057011] ---[ end trace c4eefd1fdc016ceb ]--- > > [ 1558.057734] BTRFS: error (device sda3) in __btrfs_free_extent:7007: > > errno=-2 No such entry > > [ 1558.057742] BTRFS info (device sda3): forced readonly > > [ 1558.057757] BTRFS: error (device sda3) in btrfs_run_delayed_refs:3076: > > errno=-2 No such entry > Very recently, a fix for this went into kernel 5.0-rc1: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0568e82dbe2510fc1fa664f58e5c997d3f1e649e ]zac[ Thanks for the answer. If I understand correctly the problem is caused by the concurrence of the cleanup process (which is started a few seconds after the end of the snapshot deletion) with the other operations on the filesystem. It matches what I seem to have noticed (problem that occurs after a snapshot deletion, occurs randomly due to a race condition, etc..). P.S. I suppose the 4.x.x kernel will not be corrected.
