The panic occurred when 'btrfs fi bal /test5' was executed.
/test5 is as follows:
# mount -o space_cache,compress=lzo /dev/sdc3 /test5
#
# btrfs fi sh /dev/sdc3
Label: none uuid: 38ec48b2-a64b-4225-8cc6-5eb08024dc64
Total devices 5 FS bytes used 7.87MB
devid 1 size 10.00GB used 2.02GB path /dev/sdc3
devid 2 size 15.01GB used 3.00GB path /dev/sdc5
devid 3 size 15.01GB used 3.00GB path /dev/sdc6
devid 4 size 20.01GB used 2.01GB path /dev/sdc7
devid 5 size 10.00GB used 2.01GB path /dev/sdc8
Btrfs v0.19-50-ge6bd18d
# btrfs fi df /test5
Data, RAID0: total=10.00GB, used=3.52MB
Data: total=8.00MB, used=1.60MB
System, RAID1: total=8.00MB, used=4.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=1.00GB, used=216.00KB
Metadata: total=8.00MB, used=0.00
---
Tsutomu
============================================================
<6>device fsid 25424ba6b248ec38-64dc2480b05ec68c devid 5 transid 4 /dev/sdc8
<6>device fsid 25424ba6b248ec38-64dc2480b05ec68c devid 1 transid 7 /dev/sdc3
<6>btrfs: enabling disk space caching
<6>btrfs: use lzo compression
<6>device fsid 69423c117ae771dd-c275f966f982cf84 devid 1 transid 7 /dev/sdd4
<6>btrfs: disk space caching is enabled
<6>btrfs: relocating block group 1103101952 flags 9
<6>btrfs: found 318 extents
<0>------------[ cut here ]------------
<2>kernel BUG at fs/btrfs/relocation.c:4285!
<0>invalid opcode: 0000 [#1] SMP
<4>CPU 1
<4>Modules linked in: btrfs autofs4 sunrpc 8021q garp stp llc cpufreq_ondemand
acpi_cpufreq freq_table m
perf ipv6 zlib_deflate libcrc32c ext3 jbd dm_mirror dm_region_hash dm_log
dm_mod kvm uinput ppdev parpor
t_pc parport sg pcspkr i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support tg3
shpchp i3000_edac edac_core ex
t4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom megaraid_sas pata_acpi
ata_generic ata_piix floppy [last
unloaded: btrfs]
<4>Pid: 6173, comm: btrfs Not tainted 3.0.0-rc1btrfs-test #1 FUJITSU-SV
PRIMERGY /D2399
<4>RIP: 0010:[<ffffffffa049308c>] [<ffffffffa049308c>]
btrfs_reloc_cow_block+0x22c/0x270 [btrfs]
<4>RSP: 0018:ffff8801514236a8 EFLAGS: 00010246
<4>RAX: ffff8801930dc000 RBX: ffff8801936f5800 RCX: ffff880163241d60
<4>RDX: ffff88016325dd18 RSI: ffff8801931a3000 RDI: ffff8801632fb3e0
<4>RBP: ffff880151423708 R08: ffff880151423784 R09: 0100000000000000
<4>R10: 0000000000000000 R11: ffff880163224d58 R12: ffff8801931a3000
<4>R13: ffff88016325dd18 R14: ffff8801632fb3e0 R15: 0000000000000000
<4>FS: 00007f41577ce740(0000) GS:ffff88019fd00000(0000) knlGS:0000000000000000
<4>CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
<4>CR2: 00000000010afb80 CR3: 000000015142e000 CR4: 00000000000006e0
<4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4>DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
<4>Process btrfs (pid: 6173, threadinfo ffff880151422000, task ffff880151997580)
<0>Stack:
<4> ffff88016325dd18 ffff8801632fb3e0 ffff880151423708 ffffffffa042b2ed
<4> 0000000000000000 0000000000000001 ffff880151423708 ffff8801931a3000
<4> ffff880163241d60 ffff88016325dd18 ffff8801632fb3e0 0000000000000000
<0>Call Trace:
<4> [<ffffffffa042b2ed>] ? update_ref_for_cow+0x22d/0x330 [btrfs]
<4> [<ffffffffa042b841>] __btrfs_cow_block+0x451/0x5e0 [btrfs]
<4> [<ffffffffa042badb>] btrfs_cow_block+0x10b/0x250 [btrfs]
<4> [<ffffffffa0431c67>] btrfs_search_slot+0x557/0x870 [btrfs]
<4> [<ffffffffa042a252>] ? generic_bin_search+0x1f2/0x210 [btrfs]
<4> [<ffffffffa04447bf>] btrfs_lookup_inode+0x2f/0xa0 [btrfs]
<4> [<ffffffffa04557c2>] btrfs_update_inode+0xc2/0x140 [btrfs]
<4> [<ffffffffa0444fbc>] btrfs_save_ino_cache+0x7c/0x200 [btrfs]
<4> [<ffffffffa044c5ad>] commit_fs_roots+0xad/0x180 [btrfs]
<4> [<ffffffffa044d555>] btrfs_commit_transaction+0x385/0x7d0 [btrfs]
<4> [<ffffffff81081e00>] ? wake_up_bit+0x40/0x40
<4> [<ffffffffa048f4bf>] prepare_to_relocate+0xdf/0xf0 [btrfs]
<4> [<ffffffffa0496121>] relocate_block_group+0x41/0x600 [btrfs]
<4> [<ffffffff814baa6e>] ? mutex_lock+0x1e/0x50
<4> [<ffffffffa044bc59>] ? btrfs_clean_old_snapshots+0xa9/0x150 [btrfs]
<4> [<ffffffffa0496893>] btrfs_relocate_block_group+0x1b3/0x2e0 [btrfs]
<4> [<ffffffffa0480060>] ? btrfs_tree_unlock+0x50/0x50 [btrfs]
<4> [<ffffffffa047549b>] btrfs_relocate_chunk+0x8b/0x680 [btrfs]
<4> [<ffffffffa042a04d>] ? btrfs_set_path_blocking+0x3d/0x50 [btrfs]
<4> [<ffffffffa046ee68>] ? read_extent_buffer+0xd8/0x1d0 [btrfs]
<4> [<ffffffffa0432e71>] ? btrfs_previous_item+0xb1/0x150 [btrfs]
<4> [<ffffffffa046ee68>] ? read_extent_buffer+0xd8/0x1d0 [btrfs]
<4> [<ffffffffa04766aa>] btrfs_balance+0x20a/0x2a0 [btrfs]
<4> [<ffffffffa047f85c>] btrfs_ioctl+0x54c/0xcb0 [btrfs]
<4> [<ffffffff8112277b>] ? handle_mm_fault+0x15b/0x270
<4> [<ffffffff814bf5f8>] ? do_page_fault+0x1e8/0x470
<4> [<ffffffff81163dda>] do_vfs_ioctl+0x9a/0x540
<4> [<ffffffff81164321>] sys_ioctl+0xa1/0xb0
<4> [<ffffffff814c3a02>] system_call_fastpath+0x16/0x1b
<0>Code: 8b 76 10 e8 b7 35 da e0 4c 8b 45 b0 41 80 48 71 20 48 8b 4d b8 8b 45
c0 e9 52 ff ff ff 48 83 be 0f 01 00 00 f7 0f 85 22 fe ff ff <0f> 0b eb fe 49 3b
50 20 0f 84 02 ff ff ff 0f 0b 0f 1f 40 00 eb
<1>RIP [<ffffffffa049308c>] btrfs_reloc_cow_block+0x22c/0x270 [btrfs]
<4> RSP <ffff8801514236a8>
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