Comment # 5
on bug 906684
from Christoph Bartoschek
I had just the same problem. The desktop froze and I had to reboot it via ssh:
Dec 14 21:02:35 homer kernel: ------------[ cut here ]------------
Dec 14 21:02:35 homer kernel: kernel BUG at ../fs/btrfs/extent_io.c:2875!
Dec 14 21:02:35 homer kernel: invalid opcode: 0000 [#1] PREEMPT SMP
Dec 14 21:02:35 homer kernel: Modules linked in: nls_iso8859_1 nls_cp437 vfat
fat fuse bnep bluetooth 6lowpan_iphc rfkill xt_pkttype xt_LOG xt_limit
vboxpci(O) vboxnetadp(O) vboxnetflt(O) iscsi_ibft iscsi_boot_sysfs af_packet
ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 i
Dec 14 21:02:35 homer kernel: videobuf2_memops videobuf2_core v4l2_common
videodev i2c_i801 lpc_ich mfd_core snd_timer r8169 mii snd soundcore
tpm_infineon shpchp wmi tpm_tis tpm button acpi_cpufreq processor dm_mod
ata_generic btrfs xor raid6_pq crc32c_intel uas sr_mod cdrom usb_
Dec 14 21:02:35 homer kernel: CPU: 0 PID: 1616 Comm: kwin Tainted: G
O 3.16.6-2-desktop #1
Dec 14 21:02:35 homer kernel: Hardware name: MICRO-STAR INTERNATIONAL CO.,LTD
MS-7583/P55-GD65 (MS-7583) , BIOS V1.5 11/02/2009
Dec 14 21:02:35 homer kernel: task: ffff8800b00801d0 ti: ffff88021def8000
task.ti: ffff88021def8000
Dec 14 21:02:35 homer kernel: RIP: 0010:[<ffffffffa0347068>]
[<ffffffffa0347068>] __do_readpage+0x7c8/0x7d0 [btrfs]
Dec 14 21:02:35 homer kernel: RSP: 0000:ffff88021defb988 EFLAGS: 00010206
Dec 14 21:02:35 homer kernel: RAX: 0000000000066000 RBX: 0000000000001000 RCX:
000000000000000f
Dec 14 21:02:35 homer kernel: RDX: 0000000000066000 RSI: ffff8801e244c800 RDI:
ffff8800ae9831d0
Dec 14 21:02:35 homer kernel: RBP: ffff88021defbb48 R08: ffff88022da27920 R09:
0000000000000000
Dec 14 21:02:35 homer kernel: R10: ffff8800ae9831d0 R11: 0000000000000002 R12:
ffff88021defbb48
Dec 14 21:02:35 homer kernel: R13: ffff88021defbb48 R14: 0000000000000000 R15:
0000000000659000
Dec 14 21:02:35 homer kernel: FS: 00007f2dda957800(0000)
GS:ffff88023fc00000(0000) knlGS:0000000000000000
Dec 14 21:02:35 homer kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Dec 14 21:02:35 homer kernel: CR2: 00007f2d2a568000 CR3: 000000021dfc8000 CR4:
00000000000007f0
Dec 14 21:02:35 homer kernel: Stack:
Dec 14 21:02:35 homer kernel: ffff880234178400 ffff88021defbb38
ffffffffa0347760 ffff880000000000
Dec 14 21:02:35 homer kernel: 0000000000000000 0000000000000000
0000000000659fff ffff88021f1a6460
Dec 14 21:02:35 homer kernel: 0000000000000000 ffffea00016310c0
0000000000001000 ffff880234178400
Dec 14 21:02:35 homer kernel: Call Trace:
Dec 14 21:02:35 homer kernel: [<ffffffffa0347412>]
__extent_readpages.constprop.42+0x2d2/0x2f0 [btrfs]
Dec 14 21:02:35 homer kernel: [<ffffffffa03486f5>]
extent_readpages+0x155/0x1a0 [btrfs]
Dec 14 21:02:35 homer kernel: [<ffffffff8115613b>]
__do_page_cache_readahead+0x1ab/0x230
Dec 14 21:02:35 homer kernel: [<ffffffff8114cab0>] filemap_fault+0x360/0x400
Dec 14 21:02:35 homer kernel: [<ffffffff81171afa>] __do_fault+0x3a/0xa0
Dec 14 21:02:35 homer kernel: [<ffffffff8117475d>]
do_read_fault.isra.53+0x4d/0x300
Dec 14 21:02:35 homer kernel: [<ffffffff811761cf>]
handle_mm_fault+0x81f/0x1170
Dec 14 21:02:35 homer kernel: [<ffffffff81048ce8>] __do_page_fault+0x158/0x530
Dec 14 21:02:35 homer kernel: [<ffffffff816237d8>] page_fault+0x28/0x30
Dec 14 21:02:35 homer kernel: [<00007f2dda1c4a0c>] 0x7f2dda1c4a0b
Dec 14 21:02:35 homer kernel: Code: e8 ae db ff ff e9 e2 fd ff ff e8 14 5f cc
e0 e9 08 f9 ff ff bb 00 10 00 00 31 f6 c7 84 24 b4 00 00 00 00 00 00 00 e9 6b
fe ff ff <0f> 0b 0f 0b 0f 0b 0f 0b 66 66 66 66 90 41 57 49 89 f7 41 56 41
Dec 14 21:02:35 homer kernel: RIP [<ffffffffa0347068>]
__do_readpage+0x7c8/0x7d0 [btrfs]
Dec 14 21:02:35 homer kernel: RSP <ffff88021defb988>
Dec 14 21:02:35 homer kernel: ---[ end trace 2e91724107994517 ]---