sorry, I made a typo in the "testcase" (the second mount) Basically, it might be enough to mount two different btrfs filesystems to two different locations, umount one of them and watch /var/log/kern.log for the oops
dd if=/dev/zero of=mountme bs=4k count=100000 dd if=/dev/zero of=mountme2 bs=4k count=100000 mkfs.btrfs mountme mkfs.btrfs mountme2 mkdir loop loop2 mount -o loop mountme loop mount -o loop mountme2 loop2 umount loop # wait a moment On 7/24/08, Lukas Vacek <[EMAIL PROTECTED]> wrote: > Hi, > > I tried very promising btrfs to test it a little and I experienced a > little bug in implementation. I'm not sure where the bug lies however > this works quite well to reproduce the problem: > > dd if=/dev/zero of=mountme bs=4k count=100000 > dd if=/dev/zero of=mountme2 bs=4k count=100000 > mkfs.btrfs mountme > mkfs.btrfs mountme2 > mkdir loop loop2 > mount -o loop mountme loop > mount -o loop mountme loop2 > umount loop > # wait a moment > > maybe SMP machine will be necessary to experience the same > > thanks for the (otherwise ;-)) grea work and have a nice day, > Lukas V. > > the interesting part of log goes next: > > Jul 24 22:44:00 minerva kernel: [ 1478.326985] device fsid > 5442602040543dd1-d32561672012f7a2 devid 1 transid 12 /dev/loop1 > Jul 24 22:44:54 minerva kernel: [ 1532.882212] Unable to handle kernel > paging request at 00007effdc171f47 RIP: > Jul 24 22:44:54 minerva kernel: [ 1532.882256] [wq_per_cpu+0x15/0x20] > wq_per_cpu+0x15/0x20 > Jul 24 22:44:54 minerva kernel: [ 1532.882405] PGD 0 > Jul 24 22:44:54 minerva kernel: [ 1532.882476] Oops: 0000 [1] SMP > Jul 24 22:44:54 minerva kernel: [ 1532.882572] CPU 1 > Jul 24 22:44:54 minerva kernel: [ 1532.882641] Modules linked in: loop > binfmt_misc af_packet i915 drm rfcomm l2cap bluetooth ppdev ipv6 > acpi_cpufreq cpufreq_ondemand cpufreq_stats freq_table > cpufreq_userspace cpufreq_conservative cpufreq_powersave video output > container sbs sbshc dock battery iptable_filter ip_tables x_tables > aes_x86_64 dm_crypt dm_mod ac btrfs libcrc32c lp snd_hda_intel > snd_hwdep snd_pcm_oss snd_pcm snd_page_alloc snd_mixer_oss > snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event > snd_seq snd_timer iTCO_wdt iTCO_vendor_support snd_seq_device button > snd evdev shpchp pci_hotplug intel_agp soundcore parport_pc parport > pcspkr ext3 jbd mbcache usbhid hid sg sd_mod ata_piix pata_acpi floppy > ehci_hcd ata_generic libata scsi_mod r8169 uhci_hcd usbcore thermal > processor fan fbcon tileblit font bitblit softcursor fuse > Jul 24 22:44:54 minerva kernel: [ 1532.885056] Pid: 3959, comm: > btrfs-transacti Not tainted 2.6.24-19-generic #1 > Jul 24 22:44:54 minerva kernel: [ 1532.885117] RIP: > 0010:[wq_per_cpu+0x15/0x20] [wq_per_cpu+0x15/0x20] > wq_per_cpu+0x15/0x20 > Jul 24 22:44:54 minerva kernel: [ 1532.885224] RSP: > 0018:ffff81003e6a1c08 EFLAGS: 00010246 > Jul 24 22:44:54 minerva kernel: [ 1532.885281] RAX: 00007effdc171f3f > RBX: ffff81003db0b770 RCX: 0000000000000000 > Jul 24 22:44:54 minerva kernel: [ 1532.885342] RDX: 0000000000000000 > RSI: 0000000000000001 RDI: ffff810023e8e940 > Jul 24 22:44:54 minerva kernel: [ 1532.885404] RBP: ffff81003db0a000 > R08: 0000000000000000 R09: ffffffff882c9d80 > Jul 24 22:44:54 minerva kernel: [ 1532.885465] R10: ffff81003653ade0 > R11: 0000000000000000 R12: ffff81003653ade0 > Jul 24 22:44:54 minerva kernel: [ 1532.885526] R13: 0000000000000001 > R14: ffff810014366680 R15: 0000000000000000 > Jul 24 22:44:54 minerva kernel: [ 1532.885588] FS: > 0000000000000000(0000) GS:ffff81003e401700(0000) > knlGS:0000000000000000 > Jul 24 22:44:54 minerva kernel: [ 1532.885671] CS: 0010 DS: 0018 ES: > 0018 CR0: 000000008005003b > Jul 24 22:44:54 minerva kernel: [ 1532.885728] CR2: 00007effdc171f47 > CR3: 00000000225cc000 CR4: 00000000000006e0 > Jul 24 22:44:54 minerva kernel: [ 1532.885789] DR0: 0000000000000000 > DR1: 0000000000000000 DR2: 0000000000000000 > Jul 24 22:44:54 minerva kernel: [ 1532.885851] DR3: 0000000000000000 > DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Jul 24 22:44:54 minerva kernel: [ 1532.885912] Process btrfs-transacti > (pid: 3959, threadinfo ffff81003e6a0000, task ffff81003c74c7e0) > Jul 24 22:44:54 minerva kernel: [ 1532.885996] Stack: > ffffffff8024f97c ffff81001e3db480 ffffffff882ca4ce ffffffff882c9d80 > Jul 24 22:44:54 minerva kernel: [ 1532.886193] 0000000001c08fff > ffff810014366680 ffff81003653ad40 0000000000001000 > Jul 24 22:44:54 minerva kernel: [ 1532.886364] ffff81003ee140e8 > 0000000000000001 ffffffff882e19cf 0000000001c09000 > Jul 24 22:44:54 minerva kernel: [ 1532.886495] Call Trace: > Jul 24 22:44:54 minerva kernel: [ 1532.886587] > [shpchp:queue_work+0x2c/0x50] queue_work+0x2c/0x50 > Jul 24 22:44:54 minerva kernel: [ 1532.886665] > [btrfs:btrfs_wq_submit_bio+0xbe/0xf0] > :btrfs:btrfs_wq_submit_bio+0xbe/0xf0 > Jul 24 22:44:54 minerva kernel: [ 1532.886743] > [btrfs:__btree_submit_bio_hook+0x0/0x60] > :btrfs:__btree_submit_bio_hook+0x0/0x60 > Jul 24 22:44:54 minerva kernel: [ 1532.886826] > [btrfs:submit_one_bio+0xcf/0x120] :btrfs:submit_one_bio+0xcf/0x120 > Jul 24 22:44:54 minerva kernel: [ 1532.886907] > [btrfs:extent_write_full_page+0x9d/0xb0] > :btrfs:extent_write_full_page+0x9d/0xb0 > Jul 24 22:44:54 minerva kernel: [ 1532.886992] > [btrfs:btree_get_extent+0x0/0x1f0] :btrfs:btree_get_extent+0x0/0x1f0 > Jul 24 22:44:54 minerva kernel: [ 1532.887057] > [btrfs:write_one_page+0x7b/0x430] write_one_page+0x7b/0x100 > Jul 24 22:44:54 minerva kernel: [ 1532.887140] > [btrfs:btrfs_write_and_wait_transaction+0xc6/0x130] > :btrfs:btrfs_write_and_wait_transaction+0xc6/0x130 > Jul 24 22:44:54 minerva kernel: [ 1532.887246] > [btrfs:btrfs_commit_transaction+0x3c8/0x700] > :btrfs:btrfs_commit_transaction+0x3c8/0x700 > Jul 24 22:44:54 minerva kernel: [ 1532.887314] [<ffffffff80253a00>] > autoremove_wake_function+0x0/0x30 > Jul 24 22:44:54 minerva kernel: [ 1532.887398] > [btrfs:btrfs_transaction_cleaner+0xf0/0x110] > :btrfs:btrfs_transaction_cleaner+0xf0/0x110 > Jul 24 22:44:54 minerva kernel: [ 1532.887479] > [btrfs:btrfs_transaction_cleaner+0x0/0x110] > :btrfs:btrfs_transaction_cleaner+0x0/0x110 > Jul 24 22:44:54 minerva kernel: [ 1532.887543] > [run_workqueue+0xcc/0x170] run_workqueue+0xcc/0x170 > Jul 24 22:44:54 minerva kernel: [ 1532.887601] > [worker_thread+0x0/0x110] worker_thread+0x0/0x110 > Jul 24 22:44:54 minerva kernel: [ 1532.887661] > [worker_thread+0x0/0x110] worker_thread+0x0/0x110 > Jul 24 22:44:54 minerva kernel: [ 1532.887720] > [worker_thread+0xa3/0x110] worker_thread+0xa3/0x110 > Jul 24 22:44:54 minerva kernel: [ 1532.887780] [<ffffffff80253a00>] > autoremove_wake_function+0x0/0x30 > Jul 24 22:44:54 minerva kernel: [ 1532.887842] > [worker_thread+0x0/0x110] worker_thread+0x0/0x110 > Jul 24 22:44:54 minerva kernel: [ 1532.887902] > [worker_thread+0x0/0x110] worker_thread+0x0/0x110 > Jul 24 22:44:54 minerva kernel: [ 1532.887960] [kthread+0x4b/0x80] > kthread+0x4b/0x80 > Jul 24 22:44:54 minerva kernel: [ 1532.888019] [child_rip+0xa/0x12] > child_rip+0xa/0x12 > Jul 24 22:44:54 minerva kernel: [ 1532.888083] [kthread+0x0/0x80] > kthread+0x0/0x80 > Jul 24 22:44:54 minerva kernel: [ 1532.888140] [child_rip+0x0/0x12] > child_rip+0x0/0x12 > Jul 24 22:44:54 minerva kernel: [ 1532.888198] > Jul 24 22:44:54 minerva kernel: [ 1532.888243] > Jul 24 22:44:54 minerva kernel: [ 1532.888244] Code: 48 8b 04 f0 c3 66 > 0f 1f 44 00 00 53 48 8b 4f 38 48 89 fb 48 > Jul 24 22:44:54 minerva kernel: [ 1532.888843] RIP > [wq_per_cpu+0x15/0x20] wq_per_cpu+0x15/0x20 > Jul 24 22:44:54 minerva kernel: [ 1532.888924] RSP <ffff81003e6a1c08> > Jul 24 22:44:54 minerva kernel: [ 1532.888975] CR2: 00007effdc171f47 > Jul 24 22:44:54 minerva kernel: [ 1532.889036] ---[ end trace > be35f60cd93f5943 ]--- > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
