Hi,
I could not find this anywhere else reported, so here we go:
creating a new btrfs filesystem (btrfs-progs-unstable from git) and
mounting it succeeds, unmounting however fails with the kernel messages
attached to this mail. After that, I can still read and write to the
btrfs mount, but e.g. /bin/sync never finishes, sysrq-s never reports
"Sync complete".
I'm using a vanilla kernel, yesterday's git version
and I *think* I remember having creating btrfs filesystems before (2.6.29,
IIRC) and being able to umount them without problems. But I don't know for
sure...yet.
Christian.
# uptime
21:03:57 up 0 min, 1 user, load average: 0.11, 0.03, 0.01
# uname -a
Linux sid 2.6.30-rc4 #1 Tue May 5 11:07:42 CEST 2009 x86_64 GNU/Linux
# ls -l `which mkfs.btrfs`
-rwxr-xr-x 1 root root 540530 May 5 10:42 /opt/btrfs-progs/bin/mkfs.btrfs
# mkfs.btrfs /dev/xvdb
WARNING! - Btrfs Btrfs v0.18 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
fs created label (null) on /dev/xvdb
nodesize 4096 leafsize 4096 sectorsize 4096 size 2.00GB
Btrfs Btrfs v0.18
# mount -t btrfs /dev/xvdb /mnt/d1
# df -h /mnt/d1
Filesystem Size Used Avail Use% Mounted on
/dev/xvdb 2.0G 28K 2.0G 1% /mnt/d1
# grep xvdb /proc/mounts
/dev/xvdb /mnt/d1 btrfs rw,relatime 0 0
# ls -la /mnt/d1
total 16
dr-xr-xr-x 1 root root 0 Jan 1 1970 .
drwxr-xr-x 7 root root 4096 May 5 10:46 ..
# umount /mnt/d1
Segmentation fault
# dmesg
[ 0.000000] Linux version 2.6.30-rc4 (du...@sid) (gcc version 4.4.0 (Debian
4.4.0-1~exp2) ) #1 Tue May 5 11:07:42 CEST 2009
[ 0.000000] Command line: root=/dev/xvda1 console=hvc0 init=/sbin/init
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Intel GenuineIntel
[ 0.000000] AMD AuthenticAMD
[ 0.000000] Centaur CentaurHauls
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] Xen: 0000000000000000 - 00000000000a0000 (usable)
[ 0.000000] Xen: 00000000000a0000 - 0000000000100000 (reserved)
[ 0.000000] Xen: 0000000000100000 - 0000000000580000 (usable)
[ 0.000000] Xen: 0000000000580000 - 0000000000683000 (reserved)
[ 0.000000] Xen: 0000000000683000 - 0000000020000000 (usable)
[ 0.000000] DMI not present or invalid.
[ 0.000000] last_pfn = 0x20000 max_arch_pfn = 0x100000000
[ 0.000000] init_memory_mapping: 0000000000000000-0000000020000000
[ 0.000000] 0000000000 - 0020000000 page 4k
[ 0.000000] kernel direct mapping tables up to 20000000 @ 68a000-78c000
[ 0.000000] (4 early reservations) ==> bootmem [0000000000 - 0020000000]
[ 0.000000] #0 [0000000000 - 0000001000] BIOS data page ==> [0000000000
- 0000001000]
[ 0.000000] #1 [0000683000 - 000068a000] XEN PAGETABLES ==> [0000683000
- 000068a000]
[ 0.000000] #2 [0000200000 - 000055f850] TEXT DATA BSS ==> [0000200000
- 000055f850]
[ 0.000000] #3 [000068a000 - 0000782000] PGTABLE ==> [000068a000
- 0000782000]
[ 0.000000] Zone PFN ranges:
[ 0.000000] DMA 0x00000000 -> 0x00001000
[ 0.000000] DMA32 0x00001000 -> 0x00100000
[ 0.000000] Normal 0x00100000 -> 0x00100000
[ 0.000000] Movable zone start PFN for each node
[ 0.000000] early_node_map[3] active PFN ranges
[ 0.000000] 0: 0x00000000 -> 0x000000a0
[ 0.000000] 0: 0x00000100 -> 0x00000580
[ 0.000000] 0: 0x00000683 -> 0x00020000
[ 0.000000] On node 0 totalpages: 130717
[ 0.000000] DMA zone: 56 pages used for memmap
[ 0.000000] DMA zone: 1119 pages reserved
[ 0.000000] DMA zone: 2566 pages, LIFO batch:0
[ 0.000000] DMA32 zone: 1736 pages used for memmap
[ 0.000000] DMA32 zone: 125240 pages, LIFO batch:31
[ 0.000000] trying to map vcpu_info 0 at ffffffff8047fae0, mfn ad3c8, offset
2784
[ 0.000000] cpu 0 using vcpu_info at ffffffff8047fae0
[ 0.000000] Xen: using vcpu_info placement
[ 0.000000] No local APIC present
[ 0.000000] nr_irqs_gsi: 16
[ 0.000000] Allocating PCI resources starting at 30000000 (gap:
20000000:e0000000)
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total
pages: 127806
[ 0.000000] Kernel command line: root=/dev/xvda1 console=hvc0 init=/sbin/init
[ 0.000000] Initializing CPU#0
[ 0.000000] NR_IRQS:288
[ 0.000000] PID hash table entries: 2048 (order: 11, 16384 bytes)
[ 0.000000] Detected 1999.964 MHz processor.
[ 0.010000] Console: colour dummy device 80x25
[ 0.010000] console [tty0] enabled
[ 0.010000] console [hvc0] enabled
[ 0.010000] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
[ 0.010000] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
[ 0.010000] Checking aperture...
[ 0.010000] No AGP bridge found
[ 0.010000] Memory: 509684k/524288k available (1933k kernel code, 1420k
absent, 12500k reserved, 874k data, 268k init)
[ 0.010000] SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=1,
Nodes=1
[ 0.010000] Xen: using vcpuop timer interface
[ 0.010000] installing Xen timer for CPU 0
[ 0.010000] Calibrating delay loop (skipped), value calculated using timer
frequency.. 3999.92 BogoMIPS (lpj=19999640)
[ 0.010000] Mount-cache hash table entries: 256
[ 0.010000] CPU: L1 I cache: 32K, L1 D cache: 32K
[ 0.010000] CPU: L2 cache: 4096K
[ 0.010000] CPU: Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz stepping 06
[ 0.010000] Apic disabled by BIOS
[ 0.010000] net_namespace: 544 bytes
[ 0.010000] Booting paravirtualized kernel on Xen
[ 0.010000] Xen version: 3.2.1-rc1-pre
[ 0.010000] Grant table initialized
[ 0.010000] NET: Registered protocol family 16
[ 0.010000] PCI: Fatal: No config space access function found
[ 0.010000] bio: create slab <bio-0> at 0
[ 0.010000] xen_balloon: Initialising balloon driver.
[ 0.010223] PCI: System does not support PCI
[ 0.010235] PCI: System does not support PCI
[ 0.010785] NET: Registered protocol family 2
[ 0.010816] IP route cache hash table entries: 16384 (order: 5, 131072 bytes)
[ 0.010918] TCP established hash table entries: 65536 (order: 8, 1048576
bytes)
[ 0.011396] TCP bind hash table entries: 65536 (order: 7, 524288 bytes)
[ 0.011662] TCP: Hash tables configured (established 65536 bind 65536)
[ 0.011670] TCP reno registered
[ 0.011724] NET: Registered protocol family 1
[ 0.011967] platform rtc_cmos: registered platform RTC device (no PNP device
found)
[ 0.014860] VFS: Disk quotas dquot_6.5.2
[ 0.014935] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[ 0.015304] msgmni has been set to 1024
[ 0.015407] alg: No test for stdrng (krng)
[ 0.015426] io scheduler noop registered
[ 0.015431] io scheduler anticipatory registered
[ 0.015437] io scheduler deadline registered
[ 0.015449] io scheduler cfq registered (default)
[ 0.020012] Switched to high resolution mode on CPU 0
[ 0.020432] rtc: I/O resource 70 is not free.
[ 0.020438] Linux agpgart interface v0.103
[ 0.162232] Initialising Xen virtual ethernet driver.
[ 0.189082] blkfront: xvda: barriers enabled
[ 0.189661] xvda:<3>i8042.c: No controller found.
[ 0.191359] mice: PS/2 mouse device common for all mice
[ 0.191409] md: raid0 personality registered for level 0
[ 0.191425] TCP cubic registered
[ 0.191430] NET: Registered protocol family 17
[ 0.278763] xvda1 xvda2
[ 0.286091] blkfront: xvdb: barriers enabled
[ 0.286855] xvdb: unknown partition table
[ 0.384202] blkfront: xvdc: barriers enabled
[ 0.384660] xvdc: unknown partition table
[ 0.490019] XENBUS: Device with no driver: device/console/0
[ 0.490091] md: Waiting for all devices to be available before autodetect
[ 0.490099] md: If you don't use raid, use raid=noautodetect
[ 0.490260] md: Autodetecting RAID arrays.
[ 0.490269] md: Scanned 0 and added 0 devices.
[ 0.490274] md: autorun ...
[ 0.490278] md: ... autorun DONE.
[ 0.526103] kjournald starting. Commit interval 5 seconds
[ 0.527595] EXT3 FS on xvda1, internal journal
[ 0.527609] EXT3-fs: mounted filesystem with writeback data mode.
[ 0.527626] VFS: Mounted root (ext3 filesystem) on device 202:1.
[ 0.527683] Freeing unused kernel memory: 268k freed
[ 0.552690] Warning: unable to open an initial console.
[ 3.063440] Adding 192772k swap on /dev/xvda2. Priority:1 extents:1
across:192772k SS
[ 3.342382] loop: module loaded
[ 3.718318] fuse init (API version 7.11)
[ 4.449990] RPC: Registered udp transport module.
[ 4.450004] RPC: Registered tcp transport module.
[ 4.548323] Slow work thread pool: Starting up
[ 4.549707] Slow work thread pool: Ready
[ 4.549772] FS-Cache: Loaded
[ 4.596773] FS-Cache: Netfs 'nfs' registered for caching
[ 115.470981] Btrfs loaded
[ 115.486763] device fsid a0485aee66bb72a2-b75e6c0749ef9883 devid 1 transid 9
/dev/xvdb
[ 152.576795] blkfront: xvdb: write barrier op failed
[ 152.576810] blkfront: xvdb: barriers disabled
[ 152.576815] end_request: I/O error, dev xvdb, sector 131072
[ 152.576822] end_request: I/O error, dev xvdb, sector 131072
[ 152.576846] ------------[ cut here ]------------
[ 152.576852] kernel BUG at /data/Scratch/scm/linux-2.6-git/fs/buffer.c:2933!
[ 152.576858] invalid opcode: 0000 [#1]
[ 152.576866] last sysfs file: /sys/devices/vbd-51728/block/xvdb/removable
[ 152.576872] CPU 0
[ 152.576876] Modules linked in: btrfs zlib_deflate zlib_inflate nfs lockd
fscache nfs_acl auth_rpcgss sunrpc fuse loop
[ 152.576904] Pid: 1015, comm: umount Not tainted 2.6.30-rc4 #1
[ 152.576910] RIP: e030:[<ffffffff802a53a0>] [<ffffffff802a53a0>]
submit_bh+0x110/0x120
[ 152.576923] RSP: e02b:ffff88001f8f7c78 EFLAGS: 00010246
[ 152.576929] RAX: 0000000000002028 RBX: ffff88001f5d41c0 RCX: ffffffff8047fc28
[ 152.576936] RDX: ffff88001f8f7c50 RSI: ffff88001f5d41c0 RDI: 0000000000000005
[ 152.576945] RBP: 0000000000000005 R08: ffff88001f8f6000 R09: 0000000000000000
[ 152.576952] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88001f3e2c43
[ 152.576959] R13: 0000000000000001 R14: ffff88001f5d41c0 R15: 0000000000000003
[ 152.576970] FS: 00007fc5dca97740(0000) GS:ffffffff80486000(0000)
knlGS:0000000000000000
[ 152.576978] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 152.576984] CR2: 00007fc5dc368258 CR3: 000000001e3df000 CR4: 0000000000002620
[ 152.576992] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 152.577000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 152.577008] Process umount (pid: 1015, threadinfo ffff88001f8f6000, task
ffff88001f8bbbd0)
[ 152.577015] Stack:
[ 152.577019] ffff88001f2e2600 0000000000000001 ffff88001f3e2c43
ffffffffa00edb50
[ 152.577031] ffff88001f620178 0000001800000000 0000000100000000
ffff88001f3e2c63
[ 152.577044] 00000001006e5928 ffff88001f3e2c44 0000000000000000
ffff88001f2e2600
[ 152.577060] Call Trace:
[ 152.577065] [<ffffffffa00edb50>] ? write_dev_supers+0x2f0/0x3c0 [btrfs]
[ 152.577089] [<ffffffffa00eddf9>] ? write_all_supers+0x1d9/0x230 [btrfs]
[ 152.577109] [<ffffffffa00f1e37>] ? btrfs_commit_transaction+0x647/0x870
[btrfs]
[ 152.577130] [<ffffffff80240e70>] ? autoremove_wake_function+0x0/0x30
[ 152.577141] [<ffffffffa00d1a32>] ? btrfs_sync_fs+0x52/0x90 [btrfs]
[ 152.577158] [<ffffffff802c0c72>] ? quota_sync_sb+0x52/0x160
[ 152.577168] [<ffffffff802860f8>] ? __fsync_super+0x18/0x80
[ 152.577177] [<ffffffff80286169>] ? fsync_super+0x9/0x20
[ 152.577185] [<ffffffff80286461>] ? generic_shutdown_super+0x21/0x100
[ 152.577195] [<ffffffff80286599>] ? kill_anon_super+0x9/0x20
[ 152.577204] [<ffffffff80286633>] ? deactivate_super+0x63/0xa0
[ 152.577212] [<ffffffff8029b250>] ? sys_umount+0x70/0x3a0
[ 152.577221] [<ffffffff8020fcbf>] ? system_call_fastpath+0x16/0x1b
[ 152.577231] Code: 05 00 41 0f b6 44 24 18 4c 89 e7 83 e0 80 3c 01 19 db e8
14 3c 00 00 f7 d3 83 e3 a1 89 d8 5b 5d 41 5c c3 0f 0b eb fe 0f 0b eb fe <0f> 0b
eb fe 66 66 66 2e 0f 1f 84 00 00 00 00 00 53 83 fe a1 48
[ 152.577334] RIP [<ffffffff802a53a0>] submit_bh+0x110/0x120
[ 152.577343] RSP <ffff88001f8f7c78>
[ 152.577349] ---[ end trace 89172def5c4aa34d ]---
# logout
