-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 03/13/2012 02:11 PM, Jeff Mahoney wrote: > On 02/16/2012 12:58 PM, Chris Mason wrote: >> On Thu, Feb 16, 2012 at 07:55:15PM +0600, Roman Mamedov wrote: >>> Hello, >>> >>> Please be aware that there seems to be a possible problem with >>> using NOCOW flag on files situated on a filesystem mounted >>> with compress-force(=lzo, in my case). >>> >>> Since experimenting with NOCOW, I started regularly hitting >>> this BUG at extent-tree.c:5813 >>> >>> 5813 BUG_ON(!(flags & >>> BTRFS_BLOCK_FLAG_FULL_BACKREF)); >>> >>> I was unable to make netconsole work over a bridged interface, >>> so can only post screenshots of this OOPS: >>> http://romanrm.ru/pics/2012/2012-02-16-btrfs-bug-1.jpg >>> http://romanrm.ru/pics/2012/2012-02-16-btrfs-bug-2.jpg >>> >>> This happened four times already, and always on snapshot >>> creation (but not every case). I have hourly snapshots in >>> crontab, and only one case out of about ten fails with this >>> problem. Did not try to deliberately reproduce it yet by >>> manually making snapshots very often, etc. > >> Interesting, NOCOW and compression don't really mix. We always >> cow for compression. I'll try to reproduce it. > > I hit this one today without nocow or compression. The only thing > non-default was that I mounted with -ossd. The backing store was a > 1GB non-sparse loopback file on tmpfs. > > I had kdump enabled and with 16GB, I wasn't waiting around for the > dump to complete. If it happens again, I'll have a full stack > trace. My test case was filling the disk while making snapshots.
Well that didn't take long. [ 626.100684] ------------[ cut here ]------------ [ 626.104053] kernel BUG at /usr/src/packages/BUILD/kernel-default-3.0.23/linux-3.0/fs/btrfs/extent-tree.c:6091! [ 626.104053] invalid opcode: 0000 [#1] SMP [ 626.104053] CPU 8 [ 626.104053] Modules linked in: btrfs zlib_deflate crc32c libcrc32c autofs4 edd nfs lockd fscache auth_rpcgss nfs_acl sunrpc ipv6 ipv6_lib af_packet cpufreq_conservative cpufreq_userspace cpufreq_powersave powernow_k8 mperf microcode fuse loop dm_mod igb i2c_piix4 i2c_core k10temp sg dca rtc_cmos pcspkr button serio_raw ext3 jbd mbcache ohci_hcd ehci_hcd usbcore sd_mod usb_common crc_t10dif processor thermal_sys hwmon ata_generic ahci libahci pata_atiixp libata scsi_mod [ 626.104053] Supported: Yes [ 626.104053] [ 626.104053] Pid: 14214, comm: btrfs Not tainted 3.0.23-0.0.0.0.4dd40bc-default #1 HP ProLiant DL165 G7 [ 626.104053] RIP: 0010:[<ffffffffa03cd623>] [<ffffffffa03cd623>] alloc_reserved_tree_block+0x1e3/0x1f0 [btrfs] [ 626.104053] RSP: 0018:ffff88020766fae8 EFLAGS: 00010246 [ 626.104053] RAX: ffff880434b76000 RBX: 0000000000000e2c RCX: 0000000000000000 [ 626.104053] RDX: ffff880000000000 RSI: 0000000000000000 RDI: ffff880404690678 [ 626.104053] RBP: ffff880436e7f670 R08: ffff88020766faa8 R09: 0000000000001000 [ 626.104053] R10: 0000000000000e2b R11: b000000000000000 R12: ffff880404690678 [ 626.104053] R13: 0000000000000d9d R14: ffff880432ac15a0 R15: ffff880437a01c80 [ 626.104053] FS: 00007fabeaf13740(0000) GS:ffff88043fc00000(0000) knlGS:0000000000000000 [ 626.104053] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 626.104053] CR2: 00007fabea61bb50 CR3: 0000000402dc1000 CR4: 00000000000006e0 [ 626.104053] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 626.104053] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 626.104053] Process btrfs (pid: 14214, threadinfo ffff88020766e000, task ffff8802389260c0) [ 626.104053] Stack: [ 626.104053] ffff88020766fb28 0000000000000000 0000000000000000 0000000004d3e000 [ 626.104053] ffff8800b220c000 ffff8804357bd000 0000003300000000 ffff88043977c540 [ 626.104053] ffff880437a01c80 ffff880432ac15a0 ffff8800b220c000 0000000000000001 [ 626.104053] Call Trace: [ 626.104053] [<ffffffffa03cdecc>] run_delayed_tree_ref+0xfc/0x150 [btrfs] [ 626.104053] [<ffffffffa03ce21e>] run_clustered_refs+0xce/0x310 [btrfs] [ 626.104053] [<ffffffffa03ce599>] btrfs_run_delayed_refs+0x139/0x2e0 [btrfs] [ 626.104053] [<ffffffffa03de553>] btrfs_commit_transaction+0x433/0x8a0 [btrfs] [ 626.104053] [<ffffffffa040a361>] create_snapshot+0x1a1/0x1c0 [btrfs] [ 626.104053] [<ffffffffa040aa60>] btrfs_mksubvol+0x150/0x1e0 [btrfs] [ 626.104053] [<ffffffffa040ac5b>] btrfs_ioctl_snap_create_transid+0x16b/0x1a0 [btrfs] [ 626.104053] [<ffffffffa040ad98>] btrfs_ioctl_snap_create_v2+0x108/0x110 [btrfs] [ 626.104053] [<ffffffffa040fbb7>] btrfs_ioctl+0x697/0x7d0 [btrfs] [ 626.104053] [<ffffffff81162b7b>] do_vfs_ioctl+0x8b/0x3b0 [ 626.104053] [<ffffffff81162f41>] sys_ioctl+0xa1/0xb0 [ 626.104053] [<ffffffff8144ad12>] system_call_fastpath+0x16/0x1b [ 626.104053] DWARF2 unwinder stuck at system_call_fastpath+0x16/0x1b [ 626.104053] [ 626.104053] Leftover inexact backtrace: [ 626.104053] [ 626.104053] Code: 4c 89 e7 e8 50 76 02 00 e9 6b ff ff ff 48 8b 44 24 78 48 c7 c7 30 94 43 a0 48 8b 50 09 48 8b 30 31 c0 e8 47 2b 07 e1 0f 0b eb fe <0f> 0b eb fe 66 0f 1f 84 00 00 00 00 00 41 57 41 56 41 55 41 54 [ 626.104053] RIP [<ffffffffa03cd623>] alloc_reserved_tree_block+0x1e3/0x1f0 [btrfs] [ 626.104053] RSP <ffff88020766fae8> - -- Jeff Mahoney SUSE Labs -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJPX5OQAAoJEB57S2MheeWyxisP/37vZAl8f9N9OWwXKHiqybla 6nKCLN2DN0XaNNP/2hmjXh/V8AdU1ZQOR4apS1qrLIHXCZOoF3kJlTR5vrEwUxtW GbkWr6t5TfSpdit+eSceADbGM9Yy7pi6AY830D7qj059dliLfbKHIw7k4gCbWQXa STnh2ukeFYO75a9w7RbxxlK4I2Lt7Nf5Qmd8XZkyAJyvNqYrMhu/SXkpwz8rym3U S0VH44zlKsLKSMNvn0dQYwKDZ5z1TbNgna9Wg1CpRYihVfAIjva58YXobkXHgZAb eIuOoBuPEvdw+ZNSfKlB1a/TblcHUvgSteJYfcJu/EzgGIBKlzzIrR+TQZDegVnR b4I/Jad/2Xm+1L9OZQHhJAaRetiY15aDtJ+R6+KewsQgYYILNXlIOMjA9+X646Wm ypWQ6q6XjJ4XMEEGzXGEBfrJpUXeuWEXpQkRfxI7xvGmrXT8/r4yiEqrUVbWOoUa EKMeN5u61HTXcUCdB0HtjAppO2mqFnuAVH/A4CkO3gRxVaOjPTFKIZszuxE/aJT5 Rs1VZMUoJtbLPu+npQpg2OLMUI8tdyt3RshSWEdynZaAk0utlH0lZa37shkniwe1 cK+tZwZJLQL8YLnBpF+BV9xn9dJTM82acjnOA5akSqyCXgrJcU5jrHYbiyqe44L6 I5rH1gzrESJKc9qU59Pz =SpJv -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
