Created attachment 642672 [details]
dmesg

i have noticed that my testing system, with multi device btrs has recently
crashed:
[ 1314.003173] ------------[ cut here ]------------
[ 1314.007817] kernel BUG at ../fs/btrfs/extent-tree.c:1833!
[ 1314.013242] invalid opcode: 0000 [#1] PREEMPT SMP 
[ 1314.018080] Modules linked in: fuse ebtable_filter ebtables ip6table_filter
ip6_tables iptable_filter ip_tables x_tables des3_ede_x86_64 des_generic
rpcsec_gss_krb5 nfsv4 dns_resolver nfs lockd grace fscache iscsi_ibft
iscsi_boot_sysfs af_packet hwmon_vid auth_rpcgss cdc_subset usbnet
snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic snd_hda_intel
snd_hda_codec dm_mod snd_hda_core snd_hwdep snd_pcm snd_timer 8250_fintek
edac_core edac_mce_amd acpi_cpufreq sp5100_tco pcspkr ppdev snd parport_pc
parport shpchp i2c_piix4 k10temp soundcore asus_atk0110 wmi kvm_amd kvm button
processor sunrpc ata_generic btrfs xor raid1 raid0 raid6_pq md_mod serio_raw
amdkfd amd_iommu_v2 pata_atiixp ohci_pci firewire_ohci sr_mod cdrom
firewire_core radeon crc_itu_t r8169 mii i2c_algo_bit drm_kms_helper ttm
[ 1314.089543]  drm sg
[ 1314.090428] CPU: 2 PID: 89 Comm: kworker/u12:7 Not tainted
4.2.0-rc3-2.g3b6a8b8-desktop #1
[ 1314.098733] Hardware name: System manufacturer System Product Name/M4A79
Deluxe, BIOS 4101    04/13/2011
[ 1314.108202] Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs]
[ 1314.115081] task: ffff880227472100 ti: ffff8800ca788000 task.ti:
ffff8800ca788000
[ 1314.122600] RIP: 0010:[<ffffffffa0378da6>]  [<ffffffffa0378da6>]
insert_inline_extent_backref+0xc6/0xd0 [btrfs]
[ 1314.132763] RSP: 0018:ffff8800ca78bac8  EFLAGS: 00010293
[ 1314.138099] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
0000000000000001
[ 1314.145270] RDX: ffff880000000000 RSI: 0000000000000001 RDI:
0000000000000000
[ 1314.152442] RBP: ffff8800ca78bb48 R08: 0000000000004000 R09:
ffff8800ca78b9c8
[ 1314.159525] R10: 0000000000000000 R11: 0000000000000002 R12:
ffff8802242a5000
[ 1314.166771] R13: 0000000000000000 R14: 0000000000000000 R15:
ffff8802102c1c80
[ 1314.173854] FS:  00007f9c2c373700(0000) GS:ffff88022fc80000(0000)
knlGS:0000000000000000
[ 1314.181972] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1314.187819] CR2: 00007f9c2c30e000 CR3: 0000000001c0c000 CR4:
00000000000006e0
[ 1314.194991] Stack:
[ 1314.197011]  0000000000000000 0000000000000102 0000000000000000
0000000000000000
[ 1314.204487]  0000001100000001 ffffffff811c1af9 ffff8800ca78bb28
ffffffffa036c5da
[ 1314.211960]  ffff8801a041ae78 0000000000002e93 ffff8801a041ae78
ffff880224bce800
[ 1314.219423]  ffff8801a041ae78 ffff8802102c1c80 0000000000000102
ffff8800cfacc000
[ 1314.226889]  ffff8800ca78bbf8 ffffffffa0379238 0000000000000102
0000000000000000
[ 1314.234363]  0000000000000000 0000000000000001 0000000000000000
ffff8800a08bde78
[ 1314.241841]  ffff8800ca78bbf8 0000000000004000 0000000000000000
000000110f3c0000
[ 1314.249292]  ffff8800ca78bbc8 ffffffffa03e151a ffff8800ca78bbf8
ffffffffa03e2075
[ 1314.256766] Call Trace:
[ 1314.259228]  [<ffffffff811c1af9>] ? kmem_cache_alloc+0x199/0x1b0
[ 1314.265273]  [<ffffffffa036c5da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 1314.271840]  [<ffffffffa0379238>] __btrfs_inc_extent_ref.isra.52+0x98/0x250
[btrfs]
[ 1314.279546]  [<ffffffffa03e151a>] ? find_ref_head+0x5a/0x80 [btrfs]
[ 1314.285854]  [<ffffffffa03e2075>] ? btrfs_delayed_ref_lock+0x35/0x210
[btrfs]
[ 1314.292946]  [<ffffffffa03806dd>] __btrfs_run_delayed_refs+0xc9d/0x10c0
[btrfs]
[ 1314.300359]  [<ffffffff8108a718>] ? ttwu_stat+0x98/0x100
[ 1314.305619]  [<ffffffffa0394afe>] ? join_transaction.isra.15+0x10e/0x410
[btrfs]
[ 1314.313124]  [<ffffffffa0384c43>] btrfs_run_delayed_refs.part.75+0x73/0x260
[btrfs]
[ 1314.320827]  [<ffffffffa0384ece>] delayed_ref_async_start+0x7e/0x90 [btrfs]
[ 1314.327747]  [<ffffffffa03c62da>] btrfs_scrubparity_helper+0xca/0x300
[btrfs]
[ 1314.334993]  [<ffffffffa03c654e>] btrfs_extent_refs_helper+0xe/0x10 [btrfs]
[ 1314.341991]  [<ffffffff8107f029>] process_one_work+0x159/0x470
[ 1314.347765]  [<ffffffff8107f388>] worker_thread+0x48/0x4a0
[ 1314.353351]  [<ffffffff8107f340>] ? process_one_work+0x470/0x470
[ 1314.359387]  [<ffffffff81085079>] kthread+0xc9/0xe0
[ 1314.364202]  [<ffffffff81084fb0>] ? kthread_worker_fn+0x170/0x170
[ 1314.370400]  [<ffffffff816a581f>] ret_from_fork+0x3f/0x70
[ 1314.375828]  [<ffffffff81084fb0>] ? kthread_worker_fn+0x170/0x170
[ 1314.381863] Code: 45 10 49 89 d9 48 8b 55 c8 4c 89 34 24 4c 89 e9 4c 89 fe
4c 89 e7 48 89 44 24 10 8b 45 28 89 44 24 08 e8 3e d7 ff ff 31 c0 eb bb <0f> 0b
0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 be 01 00 00 00 
[ 1314.401569] RIP  [<ffffffffa0378da6>] insert_inline_extent_backref+0xc6/0xd0
[btrfs]
[ 1314.409349]  RSP <ffff8800ca78bac8>