Hello Developers,
it seems that i discovered a bug in btrfs while testing it on a zSeries
mainframe :-)
## Test environment:
- IBM System z900 Mainframe
- Debian SID with 64 Bit Kernel
- GIT Sources from
git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable.git
- System runs as z/VM guest
- 3 Virtual CPUs
- 1 GB RAM Storage
## Initial Test Setup
- Setup a Debian SID System with a 64bit Kernel
(i.e. aptitude install linux-image-2.6.26-1-s390x)
- Restart System and build a kernel with btrfs support from the development
sources
cd /usr/src
git clone
git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable.git
cd btrfs-unstable
cp /boot/config-`uname -r`* .config
make oldconfig
make-kpkg clean
make menuconfig # acticate filesystems/btrfs
make-kpkg kernel_image --initrd --revision=marc.1
dpkg -i ../*marc.1*.deb
reboot
- Restart System
## Initial Test Setup
* setup environment variables
DEVICES="$(echo /dev/disk/by-path/ccw-0.0.{3320..3327})" # adapt for other
platforms
TESTMNT="/mnt"
DEVNOS="$(echo {3320..3327})" # only needed on system z
* Sysrq
sysctl -w kernel.sysrq=1
In case of a crash do:
echo u >/proc/sysrq-trigger
echo b >/proc/sysrq-trigger
* z/VM test setup (only needed on system z)
modprobe vmur
chccwdev -e c
vmcp "SPOOL C CLASS *"
vmur purge
* take disks online (only needed on system z)
for i in $DEVNOS; do chccwdev -e $i; done
for i in $DEVNOS; do lsdasd $i; done
* format the disks (only needed on system z)
for i in $DEVNOS; do
dasdfmt --blocksize=4096 --disk_layout=cdl --label=0x$i -p --device
/dev/disk/by-path/ccw-0.0.$i
## How to reproduce the problem
vmcp "sp cons start to *"
modprobe btrfs
for j in {1..10000};do
mkfs.btrfs -m raid1 -d raid1 $DEVICES
for i in $DEVICES;do
set -x
mount -t btrfs $i ${TESTMNT}
umount ${TESTMNT}
set +x
done
done
modprobe -r btrfs
vmcp "sp cons stop close"
=> Crashes after a few minutes
=> System ist still usable
## Console Output:
----
WARNING! - Btrfs Btrfs v0.18 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
adding device /dev/disk/by-path/ccw-0.0.3321 id 2
adding device /dev/disk/by-path/ccw-0.0.3322 id 3
adding device /dev/disk/by-path/ccw-0.0.3323 id 4
adding device /dev/disk/by-path/ccw-0.0.3324 id 5
adding device /dev/disk/by-path/ccw-0.0.3325 id 6
adding device /dev/disk/by-path/ccw-0.0.3326 id 7
adding device /dev/disk/by-path/ccw-0.0.3327 id 8
fs created label (null) on /dev/disk/by-path/ccw-0.0.3320
nodesize 4096 leafsize 4096 sectorsize 4096 size 17.45GB
Btrfs Btrfs v0.18
+ mount -t btrfs /dev/disk/by-path/ccw-0.0.3320 /mnt
Message from sysl...@virtual-206 at Thu Feb 26 20:59:23 2009 ...
virtual-206 kernel: [ 121.409129] ------------[ cut here ]------------
+ umount /mnt
Segmentation fault
+ set +x
+ mount -t btrfs /dev/disk/by-path/ccw-0.0.3321 /mnt
----
## DMESG Output:
----
[ 32.240137] eth0: no IPv6 routers present
[ 115.488507] Btrfs loaded
[ 115.866519] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 1 transid 5
/dev/disk/by-path/ccw-0.0.3320
[ 115.915710] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 2 transid 5
/dev/disk/by-path/ccw-0.0.3321
[ 115.946999] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 3 transid 5
/dev/disk/by-path/ccw-0.0.3322
[ 115.980178] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 4 transid 5
/dev/disk/by-path/ccw-0.0.3323
[ 116.010257] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 5 transid 5
/dev/disk/by-path/ccw-0.0.3324
[ 116.040025] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 6 transid 5
/dev/disk/by-path/ccw-0.0.3325
[ 116.087553] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 7 transid 5
/dev/disk/by-path/ccw-0.0.3326
[ 116.165206] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 8 transid 5
/dev/disk/by-path/ccw-0.0.3327
[ 116.192679] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 1 transid 9
/dev/dasdc
[ 116.837284] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 2 transid 13
/dev/dasdd
[ 116.937046] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 3 transid 17
/dev/dasde
[ 117.049434] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 4 transid 21
/dev/dasdf
[ 117.160114] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 5 transid 25
/dev/dasdg
[ 117.253106] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 6 transid 29
/dev/dasdh
[ 117.406531] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 7 transid 33
/dev/dasdi
[ 117.758589] device fsid 29b83b8d393a4dc1-8cb6f13d4c8056c9 devid 8 transid 37
/dev/dasdj
[ 117.968097] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 1 transid 5
/dev/disk/by-path/ccw-0.0.3320
[ 117.989932] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 2 transid 5
/dev/disk/by-path/ccw-0.0.3321
[ 118.012034] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 3 transid 5
/dev/disk/by-path/ccw-0.0.3322
[ 118.034295] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 4 transid 5
/dev/disk/by-path/ccw-0.0.3323
[ 118.056272] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 5 transid 5
/dev/disk/by-path/ccw-0.0.3324
[ 118.078121] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 6 transid 5
/dev/disk/by-path/ccw-0.0.3325
[ 118.099741] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 7 transid 5
/dev/disk/by-path/ccw-0.0.3326
[ 118.122498] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 8 transid 5
/dev/disk/by-path/ccw-0.0.3327
[ 118.143336] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 1 transid 9
/dev/dasdc
[ 118.994406] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 2 transid 13
/dev/dasdd
[ 119.300427] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 3 transid 17
/dev/dasde
[ 119.500473] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 4 transid 21
/dev/dasdf
[ 119.663706] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 5 transid 25
/dev/dasdg
[ 119.798536] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 6 transid 29
/dev/dasdh
[ 120.027853] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 7 transid 33
/dev/dasdi
[ 120.243321] device fsid 454e58b0e5104735-8ff7df6e6d6df02f devid 8 transid 37
/dev/dasdj
[ 120.496215] device fsid dc29925c1c64a29-a7b79331712e87ee devid 1 transid 5
/dev/disk/by-path/ccw-0.0.3320
[ 120.535382] device fsid dc29925c1c64a29-a7b79331712e87ee devid 2 transid 5
/dev/disk/by-path/ccw-0.0.3321
[ 120.596624] device fsid dc29925c1c64a29-a7b79331712e87ee devid 3 transid 5
/dev/disk/by-path/ccw-0.0.3322
[ 120.618358] device fsid dc29925c1c64a29-a7b79331712e87ee devid 4 transid 5
/dev/disk/by-path/ccw-0.0.3323
[ 120.650429] device fsid dc29925c1c64a29-a7b79331712e87ee devid 5 transid 5
/dev/disk/by-path/ccw-0.0.3324
[ 120.678140] device fsid dc29925c1c64a29-a7b79331712e87ee devid 6 transid 5
/dev/disk/by-path/ccw-0.0.3325
[ 120.700876] device fsid dc29925c1c64a29-a7b79331712e87ee devid 7 transid 5
/dev/disk/by-path/ccw-0.0.3326
[ 120.743745] device fsid dc29925c1c64a29-a7b79331712e87ee devid 8 transid 5
/dev/disk/by-path/ccw-0.0.3327
[ 120.767434] device fsid dc29925c1c64a29-a7b79331712e87ee devid 1 transid 9
/dev/dasdc
[ 121.339701] btrfs bad tree block start 0 29380608
[ 121.401478] btrfs bad tree block start 0 29384704
[ 121.406788] btrfs bad fsid on block 29384704
[ 121.408995] btrfs bad tree block start 0 29384704
[ 121.409129] ------------[ cut here ]------------
[ 121.409158] Badness at fs/btrfs/disk-io.c:849
[ 121.409188] Modules linked in: btrfs zlib_deflate zlib_inflate crc32c
libcrc32c dm_snapshot dm_mirror dm_region_hash dm_log dm_mod ocfs2 jbd2
ocfs2_nodemanager con+figfs ocfs2_stackglue quota_tree vmcp loop qeth_l3 vmur
qeth ccwgroup ext3 jbd mbcache dasd_eckd_mod dasd_mod+
[ 121.409691] CPU: 1 Not tainted 2.6.29-rc3 #1
[ 121.409742] Process mount (pid: 2245, task: 000000001fb693c0, ksp:
0000000016e2b740)
[ 121.409802] Krnl PSW : 0704100180000000 000003e00072306a
(read_tree_block+0x6a/0x7c [btrfs])
[ 121.410021] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0
EA:3
[ 121.410092] Krnl GPRS: 00000000000001c3 0000000000000001 fffffffffffffffb
0000000017c0d0e0
[ 121.410194] 000003e000723040 00000000002bc950 000000001efb7000
0000000000001000
[ 121.415338] 000000001e507b2b 0000000000000009 000000001efb7000
0000000017c1f5b0
[ 121.415360] 000003e000701000 000003e00075c2c8 000003e000723040
0000000016e2ba70
[ 121.415429] Krnl Code: 000003e00072305e: a744fff9 brc
4,3e000723050
[ 121.415460] 000003e000723062: a7f40004 brc
15,3e00072306a
[ 121.415487] 000003e000723066: a7f40001 brc
15,3e000723068
[ 121.415518] >000003e00072306a: e340f0c80004 lg
%r4,200(%r15)
[ 121.415544] 000003e000723070: b904002b lgr %r2,%r11
[ 121.415574] 000003e000723074: eb9ff0a00004 lmg
%r9,%r15,160(%r15)
[ 121.415600] 000003e00072307a: 07f4 bcr 15,%r4
[ 121.415630] 000003e00072307c: eb6ff0480024 stmg
%r6,%r15,72(%r15)
[ 121.415651] Call Trace:
[ 121.415661] ([<000003e000723040>] read_tree_block+0x40/0x7c [btrfs])
[ 121.415763] [<000003e000723868>] find_and_setup_root+0xa8/0xd0 [btrfs]
[ 121.415856] [<000003e000726172>] open_ctree+0xb86/0xfe0 [btrfs]
[ 121.421161] [<000003e000704734>] btrfs_get_sb+0x2bc/0x508 [btrfs]
[ 121.421258] [<00000000000d2c92>] vfs_kern_mount+0xb2/0x168
[ 121.421289] [<00000000000d2dae>] do_kern_mount+0x52/0x108
[ 121.421309] [<00000000000edcf8>] do_mount+0x7d8/0x824
[ 121.421331] [<0000000000110d38>] compat_sys_mount+0x280/0x2d8
[ 121.421356] [<00000000000266e2>] sysc_noemu+0x10/0x16
[ 121.421379] [<0000000077f23a5a>] 0x77f23a5a
[ 121.421404] Last Breaking-Event-Address:
[ 121.421415] [<0000000000000000>] 0x0
[ 121.435245] btrfs bad fsid on block 29376512
[ 121.449967] Unable to handle kernel pointer dereference at virtual kernel
address (null)
[ 121.450001] Oops: 0004 [#1] SMP
[ 121.450032] Modules linked in: btrfs zlib_deflate zlib_inflate crc32c
libcrc32c dm_snapshot dm_mirror dm_region_hash dm_log dm_mod ocfs2 jbd2
ocfs2_nodemanager con+figfs ocfs2_stackglue quota_tree vmcp loop qeth_l3 vmur
qeth ccwgroup ext3 jbd mbcache dasd_eckd_mod dasd_mod
[ 121.450431] CPU: 2 Tainted: G W 2.6.29-rc3 #1
[ 121.450475] Process umount (pid: 2273, task: 0000000016f6a6c0, ksp:
0000000016e33a70)
[ 121.450527] Krnl PSW : 0704200180000000 00000000002af5b6 (down_read+0xe/0x28)
[ 121.450617] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0
EA:3
[ 121.450680] Krnl GPRS: 0000000000000003 0000000000000000 0000000000000060
0000000000000001
[ 121.450768] 0000000017705da8 0000000000000000 0000000000000000
0000000017c13370
[ 121.450840] 0000000000000000 0000000000000000 0000000000010000
0000000000000000
[ 121.450983] 000003e000701000 000003e00075be40 000003e000715ec6
0000000016e33798
[ 121.451044] Krnl Code: 00000000002af5a8: e31020000004 lg
%r1,0(%r2)
[ 121.451068] 00000000002af5ae: b9040031 lgr %r3,%r1
[ 121.451093] 00000000002af5b2: a73b0001 aghi %r3,1
[ 121.451124] >00000000002af5b6: eb1320000030 csg
%r1,%r3,0(%r2)
[ 121.451150] 00000000002af5bc: a744fff9 brc 4,2af5ae
[ 121.451175] 00000000002af5c0: b9020011 ltgr %r1,%r1
[ 121.451199] 00000000002af5c4: a7a40005 brc
10,2af5ce
[ 121.451226] 00000000002af5c8: c0f400000790 brcl
15,2b04e8
[ 121.451245] Call Trace:
[ 121.451255] ([<000003e000715e3e>] find_free_extent+0x236/0x784 [btrfs])
[ 121.451396] [<000003e0007164f0>] __btrfs_reserve_extent+0x164/0x314 [btrfs]
[ 121.451489] [<000003e0007184e2>] btrfs_alloc_extent+0x4e/0xc8 [btrfs]
[ 121.451583] [<000003e0007185c8>] btrfs_alloc_free_block+0x6c/0xb0 [btrfs]
[ 121.451676] [<000003e00070841a>] __btrfs_cow_block+0x242/0xa08 [btrfs]
[ 121.451766] [<000003e0007093e4>] btrfs_cow_block+0x220/0x234 [btrfs]
[ 121.451857] [<000003e00072761a>] btrfs_commit_tree_roots+0x6e/0x21c [btrfs]
[ 121.452077] [<000003e000728c56>] btrfs_commit_transaction+0x33a/0x7ac
[btrfs]
[ 121.452175] [<000003e000704bec>] btrfs_sync_fs+0x88/0xa0 [btrfs]
[ 121.452264] [<0000000000121d88>] quota_sync_sb+0x50/0x118
[ 121.452287] [<00000000000d23e8>] __fsync_super+0x30/0xfc
[ 121.452309] [<00000000000d24d2>] fsync_super+0x1e/0x30
[ 121.452330] [<00000000000d28c6>] generic_shutdown_super+0x3e/0x1a4
[ 121.452352] [<00000000000d2a96>] kill_anon_super+0x1e/0x60
[ 121.452373] [<00000000000d2bb6>] deactivate_super+0x9a/0xc4
[ 121.452394] [<00000000000ec3a0>] SyS_umount+0x35c/0x38c
[ 121.452415] [<00000000000266e2>] sysc_noemu+0x10/0x16
[ 121.452438] [<0000000077f403ea>] 0x77f403ea
[ 121.452459] Last Breaking-Event-Address:
[ 121.452470] [<0000000000000000>] 0x0
[ 121.452486] <4>---[ end trace f340bd908bfc75e9 ]---
[ 121.487837] device fsid dc29925c1c64a29-a7b79331712e87ee devid 2 transid 9
/dev/dasdd
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