On Tue, 2011-08-30 at 14:27 +0800, Miao Xie wrote: > On mon, 29 Aug 2011 02:45:07 +0100, Maciej Marcin Piechotka wrote: > > I receive the bug when I try to snapshot from fcron: > > > > 2011-08-29T02:00:46.529238+01:00 picard kernel: [ 4155.444476] > > ------------[ cut here ]------------ > > 2011-08-29T02:00:46.529253+01:00 picard kernel: [ 4155.444490] kernel > > BUG at fs/btrfs/inode.c:2299! > > 2011-08-29T02:00:46.529256+01:00 picard kernel: [ 4155.444498] invalid > > opcode: 0000 [#1] PREEMPT SMP > > 2011-08-29T02:00:46.529259+01:00 picard kernel: [ 4155.444506] CPU 1 > > 2011-08-29T02:00:46.529264+01:00 picard kernel: [ 4155.444508] Modules > > linked in: microcode reiserfs btrfs zlib_deflate libcrc32c arc4 > > snd_hda_codec_conexant iwlagn mac80211 uvcvideo videodev > > v4l2_compat_ioctl32 cfg80211 snd_hda_intel snd_hda_codec snd_hwdep > > snd_pcm snd_timer snd thinkpad_acpi soundcore snd_page_alloc hwmon > > rfkill nvram e1000e zram(C) rtc_cmos tp_smapi thinkpad_ec psmouse > > fscache kvm_intel kvm configs ipv6 autofs4 usbhid uhci_hcd firewire_ohci > > firewire_core sdhci_pci ehci_hcd crc_itu_t sdhci mmc_core sd_mod usbcore > > sr_mod cdrom > > 2011-08-29T02:00:46.529267+01:00 picard kernel: [ 4155.444569] > > 2011-08-29T02:00:46.529270+01:00 picard kernel: [ 4155.444576] Pid: > > 3167, comm: btrfs Tainted: P C 3.0.3-gentoo #1 LENOVO > > 2242CTO/2242CTO > > 2011-08-29T02:00:46.529274+01:00 picard kernel: [ 4155.444586] RIP: > > 0010:[<ffffffffa031339b>] [<ffffffffa031339b>] btrfs_orphan_del > > +0x8d/0xa9 [btrfs] > > 2011-08-29T02:00:46.529276+01:00 picard kernel: [ 4155.444611] RSP: > > 0000:ffff880111c21b58 EFLAGS: 00010282 > > 2011-08-29T02:00:46.529279+01:00 picard kernel: [ 4155.444619] RAX: > > 00000000fffffffe RBX: ffff88011141bd60 RCX: 0000000000001000 > > 2011-08-29T02:00:46.529289+01:00 picard kernel: [ 4155.444626] RDX: > > 000000000000000f RSI: ffff880110c8d250 RDI: ffff880134092d80 > > 2011-08-29T02:00:46.529292+01:00 picard kernel: [ 4155.444634] RBP: > > 0000000000000000 R08: ffff880111c21a30 R09: 0000000000000011 > > 2011-08-29T02:00:46.529297+01:00 picard kernel: [ 4155.444642] R10: > > 00000000000001dc R11: 0000000000000286 R12: ffff880136866300 > > 2011-08-29T02:00:46.529299+01:00 picard kernel: [ 4155.444650] R13: > > ffff880130cac800 R14: 0000000000000001 R15: ffff880130cacb88 > > 2011-08-29T02:00:46.529302+01:00 picard kernel: [ 4155.444658] FS: > > 00007f126715a740(0000) GS:ffff88013bc80000(0000) knlGS:0000000000000000 > > 2011-08-29T02:00:46.529304+01:00 picard kernel: [ 4155.444666] CS: 0010 > > DS: 0000 ES: 0000 CR0: 000000008005003b > > 2011-08-29T02:00:46.529307+01:00 picard kernel: [ 4155.444673] CR2: > > 00007f5149eb7008 CR3: 000000009caca000 CR4: 00000000000406e0 > > 2011-08-29T02:00:46.529309+01:00 picard kernel: [ 4155.444681] DR0: > > 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > 2011-08-29T02:00:46.529311+01:00 picard kernel: [ 4155.444689] DR3: > > 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > > 2011-08-29T02:00:46.529314+01:00 picard kernel: [ 4155.444697] Process > > btrfs (pid: 3167, threadinfo ffff880111c20000, task ffff88010b35a140) > > 2011-08-29T02:00:46.529316+01:00 picard kernel: [ 4155.444705] Stack: > > 2011-08-29T02:00:46.529318+01:00 picard kernel: [ 4155.444711] > > 0000000000c369c5 ffff880130cac800 ffff880110c8dbe0 0000000000c369c5 > > 2011-08-29T02:00:46.529321+01:00 picard kernel: [ 4155.444720] > > 0000000000000000 ffff880130cacb88 ffff880130cacb90 ffffffffa03173c4 > > 2011-08-29T02:00:46.562822+01:00 picard kernel: [ 4155.444730] > > ffff880136866300 ffff88011141bd60 ffff880110c8dbe0 fffb000000000000 > > 2011-08-29T02:00:46.562959+01:00 picard kernel: [ 4155.444739] Call > > Trace: > > 2011-08-29T02:00:46.562964+01:00 picard kernel: [ 4155.444756] > > [<ffffffffa03173c4>] ? btrfs_orphan_cleanup+0x196/0x2d9 [btrfs] > > 2011-08-29T02:00:46.562966+01:00 picard kernel: [ 4155.444773] > > [<ffffffffa0317862>] ? btrfs_lookup_dentry+0x35b/0x392 [btrfs] > > 2011-08-29T02:00:46.562969+01:00 picard kernel: [ 4155.444790] > > [<ffffffffa03178a2>] ? btrfs_lookup+0x9/0x1f [btrfs] > > 2011-08-29T02:00:46.562971+01:00 picard kernel: [ 4155.444801] > > [<ffffffff810ccf63>] ? d_alloc_and_lookup+0x3a/0x60 > > 2011-08-29T02:00:46.562973+01:00 picard kernel: [ 4155.444810] > > [<ffffffff810ce356>] ? walk_component+0x210/0x3b7 > > 2011-08-29T02:00:46.562975+01:00 picard kernel: [ 4155.444818] > > [<ffffffff810cea4a>] ? path_lookupat+0x7c/0x29e > > 2011-08-29T02:00:46.562979+01:00 picard kernel: [ 4155.444827] > > [<ffffffff810cfc34>] ? do_path_lookup+0x1c/0x87 > > 2011-08-29T02:00:46.562981+01:00 picard kernel: [ 4155.444835] > > [<ffffffff810cffe2>] ? user_path_at+0x49/0x7b > > 2011-08-29T02:00:46.562983+01:00 picard kernel: [ 4155.444843] > > [<ffffffff810c8781>] ? vfs_fstatat+0x3c/0x6a > > 2011-08-29T02:00:46.562986+01:00 picard kernel: [ 4155.444853] > > [<ffffffff8102d38e>] ? sub_preempt_count+0x83/0x94 > > 2011-08-29T02:00:46.562988+01:00 picard kernel: [ 4155.444861] > > [<ffffffff810c88ab>] ? sys_newstat+0x12/0x2b > > 2011-08-29T02:00:46.562990+01:00 picard kernel: [ 4155.444870] > > [<ffffffff81346d4f>] ? page_fault+0x1f/0x30 > > 2011-08-29T02:00:46.562992+01:00 picard kernel: [ 4155.444878] > > [<ffffffff8134713b>] ? system_call_fastpath+0x16/0x1b > > 2011-08-29T02:00:46.562995+01:00 picard kernel: [ 4155.444885] Code: 4d > > 85 e4 74 28 48 8b 93 70 fe ff ff 48 81 fa 00 01 00 00 77 07 48 8b 93 b0 > > 00 00 00 4c 89 ee 4c 89 e7 e8 af 28 02 00 85 c0 74 02 <0f> 0b 85 ed 74 > > 08 48 89 df e8 e0 ca fe ff 5d 31 c0 5b 5d 41 5c > > 2011-08-29T02:00:46.563001+01:00 picard kernel: [ 4155.444926] RIP > > [<ffffffffa031339b>] btrfs_orphan_del+0x8d/0xa9 [btrfs] > > 2011-08-29T02:00:46.563004+01:00 picard kernel: [ 4155.444943] RSP > > <ffff880111c21b58> > > 2011-08-29T02:00:46.563014+01:00 picard kernel: [ 4155.464057] ---[ end > > trace 276655044a13c7af ]--- > > > > Unfortunately it results in freeze of system and I cannot give more > > details. Sometimes it happens not from fcron but then it does not result > > in freeze (???). > > Could you give me the method to reproduce it? > > Thanks > Miao
I still have no idea how to reproduce it but: a) It happens on both clean 3.1 kernels as on 3.0 with various patches b) The snapshotting is not a cause (it was coincident) c) It usually happens a few minutes past 3 UTC. I have no idea what is casuing this but it is consistent. d) Compression is not a cause Best regards
signature.asc
Description: This is a digitally signed message part
