http://bugzilla.opensuse.org/show_bug.cgi?id=933427
http://bugzilla.opensuse.org/show_bug.cgi?id=933427#c5
--- Comment #5 from Martin Pluskal ---
Hmm when btrfs balance was running on this fs, it seem that kernel crashed, and
after reboot mount failed: http://paste.opensuse.org/view/raw/14449084
[ 389.614995] ------------[ cut here ]------------
[ 389.619563] kernel BUG at ../fs/btrfs/extent-tree.c:2248!
[ 389.620180] ------------[ cut here ]------------
[ 389.620199] WARNING: CPU: 2 PID: 628 at ../fs/btrfs/delayed-ref.c:475
update_existing_ref+0x18d/0x1e0 [btrfs]()
[ 389.620206] Modules linked in: btrfs xor raid6_pq ata_generic raid0 raid1
md_mod pata_atiixp ohci_pci radeon sr_mod cdrom firewire_ohci i2c_algo_bit
drm_kms_helper firewire_core crc_itu_t ttm drm r8169 mii sg
[ 389.620208] CPU: 2 PID: 628 Comm: mount Tainted: G W
4.0.5-1-desktop #1
[ 389.620209] Hardware name: System manufacturer System Product Name/M4A79
Deluxe, BIOS 4101 04/13/2011
[ 389.620210] 0000000000000000 ffffffffa0442a13 ffffffff8167c83a
0000000000000000
[ 389.620212] ffffffff81063bb1 ffff8800cbad4d40 ffff8800cbb31ee8
0000000000000002
[ 389.620213] ffff8800cbb31e80 ffff8801f8d8da68 ffffffffa040b86d
ffff88022496c558
[ 389.620213] Call Trace:
[ 389.620221] [<ffffffff8100574c>] dump_trace+0x8c/0x340
[ 389.620223] [<ffffffff81005aa3>] show_stack_log_lvl+0xa3/0x190
[ 389.620226] [<ffffffff81007201>] show_stack+0x21/0x50
[ 389.620228] [<ffffffff8167c83a>] dump_stack+0x47/0x67
[ 389.620231] [<ffffffff81063bb1>] warn_slowpath_common+0x81/0xb0
[ 389.620243] [<ffffffffa040b86d>] update_existing_ref+0x18d/0x1e0 [btrfs]
[ 389.620259] [<ffffffffa040bc17>] add_delayed_tree_ref+0xe7/0x1b0 [btrfs]
[ 389.620271] [<ffffffffa040c824>] btrfs_add_delayed_tree_ref+0x124/0x190
[btrfs]
[ 389.620281] [<ffffffffa03aafd0>] btrfs_free_extent+0xe0/0x140 [btrfs]
[ 389.620292] [<ffffffffa03ab302>] do_walk_down+0x2d2/0x8d0 [btrfs]
[ 389.620302] [<ffffffffa03ab9bc>] walk_down_tree+0xbc/0x100 [btrfs]
[ 389.620312] [<ffffffffa03af371>] btrfs_drop_snapshot+0x401/0x860 [btrfs]
[ 389.620326] [<ffffffffa04138a1>] merge_reloc_roots+0xd1/0x240 [btrfs]
[ 389.620338] [<ffffffffa04146c3>] btrfs_recover_relocation+0x373/0x3d0
[btrfs]
[ 389.620348] [<ffffffffa0394ba1>] btrfs_remount+0x401/0x550 [btrfs]
[ 389.620352] [<ffffffff811d9af6>] do_remount_sb+0x66/0x1f0
[ 389.620354] [<ffffffff811f7bcf>] do_mount+0x6af/0xae0
[ 389.620357] [<ffffffff811f82fc>] SyS_mount+0x8c/0xe0
[ 389.620359] [<ffffffff8168318d>] system_call_fastpath+0x16/0x1b
[ 389.620362] [<00007f30b551c1aa>] 0x7f30b551c1aa
[ 389.620362] ---[ end trace 8df34620f5af12f3 ]---
[ 389.636659] ------------[ cut here ]------------
...
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