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Date: Tue, 24 Feb 2009 22:22:03 -0600 From: "Mitch Harder (aka DontPanic)" <mmharder@...il.com> To: Hugo Mills <hugo-lkml@...fax.org.uk>, linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, Chris Mason <chris.mason@...cle.com> Subject: Re: btrfs: warn_slowpath in clean_tree_block and others I have also been getting similar warnings filling up my logs. However, in my case, I have been experimenting with back-porting btrfs to a 2.6.28 kernel. So I've been waiting for the back-porting efforts to get a little further along. But I thought I'd respond in case this information helps. Here's an example of the warnings I've been seeing: [80577.151167] ------------[ cut here ]------------ [80577.151169] WARNING: at /var/tmp/portage/sys-fs/btrfs-9998/work/btrfs-9998/disk-io.c:860 clean_tree_block+0xa4/0xb0 [btrfs]() [80577.151172] Modules linked in: btrfs snd_pcm_oss snd_mixer_oss snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device ipv6 ppdev snd_intel8x0 snd_ac97_codec parport_pc nvidia(P) ac97_bus snd_pcm snd_timer ohci_hcd ssb shpchp pci_hotplug pcmcia i2c_nforce2 snd forcedeth sr_mod pcspkr parport i2c_core snd_page_alloc nvidia_agp sl811_hcd pcmcia_core uhci_hcd ehci_hcd [80577.151190] Pid: 11503, comm: cp Tainted: P W 2.6.28-sabayon-r10 #1 [80577.151192] Call Trace: [80577.151195] [<c011e77f>] warn_on_slowpath+0x5f/0x90 [80577.151203] [<c043c427>] rb_insert_color+0x77/0xe0 [80577.151221] [<f8c28e9e>] alloc_extent_buffer+0x1fe/0x300 [btrfs] [80577.151238] [<f8c08d54>] clean_tree_block+0xa4/0xb0 [btrfs] [80577.151253] [<f8bf665d>] btrfs_init_new_buffer+0x7d/0x130 [btrfs] [80577.151269] [<f8bfb6f4>] btrfs_alloc_free_block+0x104/0x110 [btrfs] [80577.151285] [<f8bef3da>] __btrfs_cow_block+0x22a/0x8b0 [btrfs] [80577.151300] [<f8bed212>] generic_bin_search+0x162/0x1c0 [btrfs] [80577.151315] [<f8bf00e6>] btrfs_cow_block+0x156/0x200 [btrfs] [80577.151330] [<f8bf3267>] btrfs_search_slot+0x1a7/0x910 [btrfs] [80577.151333] [<c01230e7>] irq_exit+0x27/0x60 [80577.151336] [<c01052cb>] do_IRQ+0x6b/0x80 [80577.151354] [<f8c24a55>] read_extent_buffer+0xd5/0x170 [btrfs] [80577.151369] [<f8bf3f7d>] btrfs_insert_empty_items+0x6d/0x410 [btrfs] [80577.151385] [<f8bf8f4f>] btrfs_find_block_group+0xff/0x1a0 [btrfs] [80577.151402] [<f8c0fa1d>] btrfs_new_inode+0x18d/0x360 [btrfs] [80577.151420] [<f8c135a9>] btrfs_create+0x189/0x2a0 [btrfs] [80577.151423] [<c04162d9>] security_capable+0x9/0x10 [80577.151427] [<c0197f3d>] vfs_create+0xcd/0x160 [80577.151430] [<c019ad6f>] do_filp_open+0x5af/0x7d0 [80577.151433] [<c01932e9>] cp_new_stat64+0xf9/0x110 [80577.151436] [<c018e40e>] do_sys_open+0x4e/0xe0 [80577.151439] [<c018e51c>] sys_open+0x2c/0x40 [80577.151442] [<c0103165>] sysenter_do_call+0x12/0x21 [80577.151444] ---[ end trace 79cdc48bc88dedf7 ]--- On Tue, Feb 24, 2009 at 5:02 PM, Hugo Mills <hugo-lkml@...fax.org.uk> wrote: > This is essentially a repost of a mail I made last week, to which I > didn't get a reply. > > I'm getting huge numbers of kernel warnings whilst using > btrfs. They're all "warn_slowpath", and all seem to be in > fs/btrfs/disk-io.c. I've included one typical example at the end of > this mail. > > Kernel versions are 2.6.29-rc2, -rc4 and -rc6. > > If I do lots of writes to my btrfs filesystem (e.g. video > encoding), I end up with a syslog in the tens-of-megabytes range. This > makes logcheck an unhappy bunny... > > I don't know if this behaviour is expected, and everyone using > btrfs simply puts up with it for now, or if it's something unusual > that needs investigating. On the chance that it's the latter, I'm > reporting it here. > > Hugo. > > Feb 23 21:45:42 vlad kernel: ------------[ cut here ]------------ > Feb 23 21:45:42 vlad kernel: WARNING: at fs/btrfs/disk-io.c:815 clean_tree_block+0x9d/0xbb [btrfs]() > Feb 23 21:45:42 vlad kernel: Hardware name: System Product Name > Feb 23 21:45:42 vlad kernel: Modules linked in: tun ext3 jbd btrfs zlib_deflate tcp_diag inet_diag kqemu cpufreq_userspace ipv6 nfsd nfs lockd nfs_acl auth_rpcgss sunrpc af_packet bridge stp llc xfs exportfs it87 hwmon_vid powernow_k8 sbp2 ieee1394 ide_generic ide_gd_mod ide_cd_mod pcspkr evdev k8temp hwmon i2c_viapro i2c_core button dm_mirror dm_region_hash dm_log dm_snapshot dm_mod raid1 md_mod usbhid usb_storage libusual sg sr_mod cdrom via82cxxx floppy via_rhine mii ehci_hcd uhci_hcd usbcore pata_via ide_pci_generic ide_core sd_mod thermal processor fan unix > Feb 23 21:45:42 vlad kernel: Pid: 27034, comm: hdparm Tainted: G W 2.6.29-rc4 #1 > Feb 23 21:45:42 vlad kernel: Call Trace: > Feb 23 21:45:42 vlad kernel: [<ffffffff80228d7d>] warn_slowpath+0xd8/0x111 > Feb 23 21:45:42 vlad kernel: [<ffffffff80312f11>] radix_tree_insert+0xd7/0x19f > Feb 23 21:45:42 vlad kernel: [<ffffffff8024d55d>] add_to_page_cache_locked+0x52/0x9e > Feb 23 21:45:42 vlad kernel: [<ffffffff8024d5e9>] add_to_page_cache_lru+0x40/0x58 > Feb 23 21:45:42 vlad kernel: [<ffffffff8024dbd0>] find_or_create_page+0x62/0x88 > Feb 23 21:45:42 vlad kernel: [<ffffffffa03f992a>] alloc_extent_buffer+0x268/0x2ec [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03e1b18>] clean_tree_block+0x9d/0xbb [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d5eaf>] btrfs_init_new_buffer+0x99/0xf3 [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d849e>] btrfs_alloc_free_block+0x83/0x8c [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03cb2f8>] __btrfs_cow_block+0x1ff/0x87e [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03cc125>] btrfs_cow_block+0x1e7/0x1f6 [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffff80251d9e>] __alloc_pages_internal+0xd2/0x3ec > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d0915>] btrfs_search_slot+0x36f/0x99b [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d14ee>] btrfs_insert_empty_items+0x7f/0x49d [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d825d>] __btrfs_alloc_reserved_extent+0x19f/0x2bb [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d83f0>] btrfs_alloc_extent+0x77/0xa2 [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d847f>] btrfs_alloc_free_block+0x64/0x8c [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03cb2f8>] __btrfs_cow_block+0x1ff/0x87e [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d7532>] finish_current_insert+0x514/0x528 [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03d7bf9>] del_pending_extents+0xa5/0x33d [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03cc125>] btrfs_cow_block+0x1e7/0x1f6 [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03e436d>] btrfs_commit_tree_roots+0x53/0x1ba [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffff80403a3e>] schedule_timeout+0xa1/0xbc > Feb 23 21:45:42 vlad kernel: [<ffffffffa03e55dd>] btrfs_commit_transaction+0x322/0x6e5 [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffff802385fb>] autoremove_wake_function+0x0/0x2e > Feb 23 21:45:42 vlad kernel: [<ffffffffa03e4809>] join_transaction+0x129/0x147 [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffffa03c8788>] btrfs_sync_fs+0x70/0x78 [btrfs] > Feb 23 21:45:42 vlad kernel: [<ffffffff8026f332>] sync_filesystems+0xa8/0xde > Feb 23 21:45:42 vlad kernel: [<ffffffff80287256>] do_sync+0x25/0x50 > Feb 23 21:45:42 vlad kernel: [<ffffffff8028728f>] sys_sync+0xe/0x13 > Feb 23 21:45:42 vlad kernel: [<ffffffff8020b25b>] system_call_fastpath+0x16/0x1b > Feb 23 21:45:42 vlad kernel: ---[ end trace a315082d564863a6 ]--- > > > -- > === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === > PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk > --- Eighth Army Push Bottles Up Germans -- WWII newspaper --- > headline (possibly apocryphal) > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > > iD8DBQFJpHyZIKyzvlFcI40RApVLAJoDrHaA+9cebRyJDm+vhGqgEQGiMACguCV+ > znRCpat0ajek+ivXViQX5rg= > =GsHM > -----END PGP SIGNATURE----- > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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