On Tue, Jun 20, 2017 at 07:39:16AM -0700, Marc MERLIN wrote: > My filesystem got remounted read only, and yet after a lengthy > btrfs check --repair, it ran clean. > > Any idea what went wrong? > [846332.992285] WARNING: CPU: 4 PID: 4095 at fs/btrfs/free-space-cache.c:1476 > tree_insert_offset+0x78/0xb1 > [846333.744721] BTRFS critical (device dm-1): unable to add free space :-17 > [847312.529660] BTRFS: Transaction aborted (error -17) > [847313.218391] BTRFS: error (device dm-1) in btrfs_run_delayed_refs:2961: > errno=-17 Object already exists
Error 17 is EEXIST, so I'd guess (and it is a guess) that it's trying to add a free space cache record for some space that already has such a record. This might also match with: [...] > gargamel:~# btrfs check --repair /dev/mapper/dshelf2 [...] > cache and super generation don't match, space cache will be invalidated [...] I'd try clearing the cache (mount with -o clear_cache, once), and then letting it rebuild. Hugo. > checking fs roots > checking csums > checking root refs > found 5544539336704 bytes used, no error found > total csum bytes: 5344305964 > total tree bytes: 70455754752 > total fs tree bytes: 58427670528 > total extent tree bytes: 5372461056 > btree space waste bytes: 10620592981 > file data blocks allocated: 7735818444800 > referenced 6155805896704 > > > this is how it went read only: > [846332.977964] ------------[ cut here ]------------ > [846332.992285] WARNING: CPU: 4 PID: 4095 at fs/btrfs/free-space-cache.c:1476 > tree_insert_offset+0x78/0xb1 > [846333.402648] CPU: 4 PID: 4095 Comm: btrfs-transacti Tainted: G U > 4.11.3-amd64-preempt-sysrq-20170406 #5 > [846333.434917] Hardware name: System manufacturer System Product > Name/P8H67-M PRO, BIOS 3904 04/27/2013 > [846333.463597] Call Trace: > [846333.469942] usb 2-1-port4: device 2-1.4 not suspended yet > [846333.489639] dump_stack+0x61/0x7d > [846333.500480] __warn+0xc2/0xdd > [846333.510956] warn_slowpath_null+0x1d/0x1f > [846333.524103] tree_insert_offset+0x78/0xb1 > [846333.537337] link_free_space+0x2c/0x41 > [846333.549991] __btrfs_add_free_space+0x89/0x3aa > [846333.564236] ? kmem_cache_free+0x3d/0x92 > [846333.577702] btrfs_add_free_space+0x1d/0x1f > [846333.591179] unpin_extent_range+0xf3/0x2b0 > [846333.605220] btrfs_finish_extent_commit+0xda/0x1d4 > [846333.621324] btrfs_commit_transaction+0x629/0x79a > [846333.637205] ? add_wait_queue+0x44/0x44 > [846333.649680] transaction_kthread+0xe2/0x178 > [846333.663201] ? btrfs_cleanup_transaction+0x3e8/0x3e8 > [846333.679033] kthread+0xfb/0x100 > [846333.690261] ? init_completion+0x24/0x24 > [846333.703239] ? do_fast_syscall_32+0xb7/0xfe > [846333.717649] ret_from_fork+0x2c/0x40 > [846333.729656] ---[ end trace 27aa532d1886e536 ]--- > [846333.744721] BTRFS critical (device dm-1): unable to add free space :-17 > > [847312.529660] BTRFS: Transaction aborted (error -17) > [847312.912784] CPU: 6 PID: 4094 Comm: btrfs-cleaner Tainted: G U W > 4.11.3-amd64-preempt-sysrq-20170406 #5 > [847312.913132] usb 2-1-port4: device 2-1.4 not suspended yet > [847312.962394] Hardware name: System manufacturer System Product > Name/P8H67-M PRO, BIOS 3904 04/27/2013 > [847312.990936] Call Trace: > [847312.999347] dump_stack+0x61/0x7d > [847313.010383] __warn+0xc2/0xdd > [847313.020351] warn_slowpath_fmt+0x5a/0x76 > [847313.033274] btrfs_run_delayed_refs+0xb1/0x1cc > [847313.047655] btrfs_should_end_transaction+0x50/0x57 > [847313.063910] btrfs_drop_snapshot+0x38a/0x6c4 > [847313.078619] ? btrfs_kill_all_delayed_nodes+0x5f/0xd7 > [847313.094916] ? _raw_spin_lock+0x15/0x17 > [847313.108325] btrfs_clean_one_deleted_snapshot+0xce/0xdc > [847313.125493] cleaner_kthread+0x91/0x14b > [847313.138228] ? btrfs_destroy_pinned_extent+0xd2/0xd2 > [847313.154308] kthread+0xfb/0x100 > [847313.164900] ? init_completion+0x24/0x24 > [847313.177781] ? do_fast_syscall_32+0xb7/0xfe > [847313.191490] ret_from_fork+0x2c/0x40 > [847313.203432] ---[ end trace 27aa532d1886e537 ]--- > [847313.218391] BTRFS: error (device dm-1) in btrfs_run_delayed_refs:2961: > errno=-17 Object already exists > [847313.247668] BTRFS info (device dm-1): forced readonly > > [849789.173126] BTRFS error (device dm-1): parent transid verify failed on > 1935589703680 wanted 37959 found 3229 > [849789.218675] BTRFS error (device dm-1): parent transid verify failed on > 1935589703680 wanted 37959 found 3229 > > [863279.783590] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863279.827526] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863279.857797] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863279.888096] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863279.918393] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863279.948740] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863279.979033] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863280.009362] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863280.040438] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > [863280.070966] BTRFS error (device dm-1): parent transid verify failed on > 1932065177600 wanted 37959 found 3634 > -- Hugo Mills | I believe that it's closely correlated with the hugo@... carfax.org.uk | aeroswine coefficient http://carfax.org.uk/ | PGP: E2AB1DE4 | Adrian Bridgett
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