> I haven't seen this with 4.7.10. I suggest running 'btrfs check'
> (without repair) using a recent btrfs-progs. You can find 4.8.3 in
> koji, just download the appropriate rpm, and 'dnf update *rpm'
>
> As for kernel, Fedora 23 has 4.8.8 in updates (stable) and 4.8.10 is
> in updates-testing, I suggest moving to one of those.
>
>
> Chris Murphy
Same problem, this time on a local subvolume.
kernel-4.8.8-100.fc23.x86_64
btrfs-progs v4.8.5
P.S. Do you want to do some debugging?
Otherwise I proceed with the reset of the partition.
My feeling is that in the btrfs receive function there is a random bug,
which makes the file system unusable.
btrfs check /dev/sda2
Checking filesystem on /dev/sda2
UUID: d49d8f95-84ee-4452-9252-ad030a083739
checking extents
ref mismatch on [312324046848 16384] extent item 0, found 1
Backref 312324046848 parent 1309 root 1309 not found in extent tree
backpointer mismatch on [312324046848 16384]
owner ref check failed [312324046848 16384]
ref mismatch on [322595897344 16384] extent item 0, found 1
Backref 322595897344 parent 1309 root 1309 not found in extent tree
backpointer mismatch on [322595897344 16384]
owner ref check failed [322595897344 16384]
checking free space cache
checking fs roots
warning line 3822
checking csums
checking root refs
found 162417897472 bytes used err is 0
total csum bytes: 152292600
total tree bytes: 6461636608
total fs tree bytes: 6010830848
total extent tree bytes: 281214976
btree space waste bytes: 1142051927
file data blocks allocated: 6628422606848
referenced 961225981952
dmesg
[11265.556898] Call Trace:
[11265.556908] [<ffffffff923e493e>] dump_stack+0x63/0x85
[11265.556916] [<ffffffff920a0ecb>] __warn+0xcb/0xf0
[11265.556919] [<ffffffff920a0ffd>] warn_slowpath_null+0x1d/0x20
[11265.556948] [<ffffffffc0351504>] __btrfs_free_extent.isra.69+0x864/0xcc0
[btrfs]
[11265.556978] [<ffffffffc0355cce>] __btrfs_run_delayed_refs+0xace/0x1220 [btrfs]
[11265.557006] [<ffffffffc03535dc>] ? btrfs_set_disk_extent_flags+0x7c/0xb0
[btrfs]
[11265.557034] [<ffffffffc03592f3>] btrfs_run_delayed_refs+0x93/0x2b0 [btrfs]
[11265.557077] [<ffffffffc0395e5b>] ? free_extent_buffer+0x4b/0xa0 [btrfs]
[11265.557112] [<ffffffffc036e87a>] btrfs_should_end_transaction+0x5a/0x60
[btrfs]
[11265.557139] [<ffffffffc0357a69>] btrfs_drop_snapshot+0x429/0x800 [btrfs]
[11265.557172] [<ffffffffc036fba9>] btrfs_clean_one_deleted_snapshot+0xa9/0xf0
[btrfs]
[11265.557202] [<ffffffffc036650d>] cleaner_kthread+0x15d/0x1d0 [btrfs]
[11265.557229] [<ffffffffc03663b0>] ? btrfs_destroy_pinned_extent+0xf0/0xf0
[btrfs]
[11265.557235] [<ffffffff920c0bf8>] kthread+0xd8/0xf0
[11265.557242] [<ffffffff927ffcbf>] ret_from_fork+0x1f/0x40
[11265.557247] [<ffffffff920c0b20>] ? kthread_worker_fn+0x170/0x170
[11265.557282] ---[ end trace 577009d8a389f458 ]---
[11265.557288] BTRFS info (device sda2): leaf 327108411392 total ptrs 190 free
space 88
[11265.557292] item 0 key (312323358720 169 0) itemoff 16142 itemsize 141
[11265.557294] extent refs 13 gen 2089 flags 258
[11265.557295] tree block backref root 1326
[11265.557297] tree block backref root 1324
..... long text ....
[11265.558885] tree block backref root 1314
[11265.558886] shared block backref parent 322595897344
[11265.558887] shared block backref parent 322309390336
[11265.558889] shared block backref parent 322171060224
[11265.558890] shared block backref parent 319298207744
[11265.558891] shared block backref parent 312326356992
[11265.558895] BTRFS error (device sda2): unable to find ref byte nr
312324046848 parent 0 root 1309 owner 1 offset 0
[11265.558901] ------------[ cut here ]------------
[11265.558931] WARNING: CPU: 3 PID: 6915 at fs/btrfs/extent-tree.c:6951
__btrfs_free_extent.isra.69+0x8c8/0xcc0 [btrfs]
[11265.558932] BTRFS: Transaction aborted (error -2)
..... ....
[11265.559095] Call Trace:
[11265.559102] [<ffffffff923e493e>] dump_stack+0x63/0x85
[11265.559108] [<ffffffff920a0ecb>] __warn+0xcb/0xf0
[11265.559114] [<ffffffff920a0f4f>] warn_slowpath_fmt+0x5f/0x80
[11265.559141] [<ffffffffc0351568>] __btrfs_free_extent.isra.69+0x8c8/0xcc0
[btrfs]
[11265.559170] [<ffffffffc0355cce>] __btrfs_run_delayed_refs+0xace/0x1220 [btrfs]
[11265.559197] [<ffffffffc03535dc>] ? btrfs_set_disk_extent_flags+0x7c/0xb0
[btrfs]
[11265.559225] [<ffffffffc03592f3>] btrfs_run_delayed_refs+0x93/0x2b0 [btrfs]
[11265.559265] [<ffffffffc0395e5b>] ? free_extent_buffer+0x4b/0xa0 [btrfs]
[11265.559298] [<ffffffffc036e87a>] btrfs_should_end_transaction+0x5a/0x60
[btrfs]
[11265.559324] [<ffffffffc0357a69>] btrfs_drop_snapshot+0x429/0x800 [btrfs]
[11265.559355] [<ffffffffc036fba9>] btrfs_clean_one_deleted_snapshot+0xa9/0xf0
[btrfs]
[11265.559384] [<ffffffffc036650d>] cleaner_kthread+0x15d/0x1d0 [btrfs]
[11265.559411] [<ffffffffc03663b0>] ? btrfs_destroy_pinned_extent+0xf0/0xf0
[btrfs]
[11265.559416] [<ffffffff920c0bf8>] kthread+0xd8/0xf0
[11265.559423] [<ffffffff927ffcbf>] ret_from_fork+0x1f/0x40
[11265.559428] [<ffffffff920c0b20>] ? kthread_worker_fn+0x170/0x170
[11265.559431] ---[ end trace 577009d8a389f459 ]---
[11265.559434] BTRFS: error (device sda2) in __btrfs_free_extent:6951:
errno=-2 No such entry
[11265.559439] BTRFS info (device sda2): forced readonly
[11265.559444] BTRFS: error (device sda2) in btrfs_run_delayed_refs:2960:
errno=-2 No such entry
[11265.805418] BTRFS error (device sda2): cleaner transaction attach returned
-30
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