Message-ID: <20081021101510.GA16244@ime.usp.br>
Date:	Tue, 21 Oct 2008 08:15:10 -0200
From:	Rogério Brito <rbrito@....usp.br>
To:	Alexandre Lymberopoulos <lymber@...il.com>
Cc:	502583@...s.debian.org, 502583-submitter@...s.debian.org,
	linux-kernel@...r.kernel.org
Subject: Re: Bug#502583: scary messages in dmesg

On Oct 20 2008, Alexandre Lymberopoulos wrote:
> It's not a memory stick, it's a hard disk with ext3 file system. I
> just plugged it it and the disk was automatically mounted in /dev/ext3
> with no abnormal messages in dmesg.

Ok, this far.

> That weird messages appeared when I unpplugged the disk (without
> umounting it, as it should be done when using usbmount, right?).

Did you sync the device? From the message, it seems that some data were to
be written to the device, but the device was already gone by that time, but
I'm not a specialist on the filesystem subsystem and perhaps others could
say more about it.

OTOH, the device might have been mounted with the sync option and I don't
know how it could have happened in this latter case.

> When mounted I got a message asking for a fsck to be run on disk
> because of many mount/umount processes without performing that
> procedure.

In a subsequent mount, I guess.

> By the way I think I've lost no data, but that messages are pretty
> scary. I'm sorry I can't help that much, since I'm no more that a user
> and big fan of Linux.

Ok. I'm putting here the messages from Alexandre's dmesg, so that it would
be helpful for the filesystem developers to tell us more about the
situation:

> > [32282.607205] wmnetload[6372]: segfault at 1 ip b7db75a9 sp bfdfc288 error 4 in libc-2.7.so[b7d41000+155000]
> > [39070.466297] usb 5-2: USB disconnect, address 3
> > [39071.159613] Buffer I/O error on device sda1, logical block 1545
> > [39071.159625] lost page write due to I/O error on sda1
> > [39071.159642] ------------[ cut here ]------------
> > [39071.159646] WARNING: at fs/buffer.c:1186 mark_buffer_dirty+0x20/0x6a()
> > [39071.159649] Modules linked in: nls_utf8 nls_cp437 vfat fat nls_base sd_mod usb_storage i915 drm ipv6 loop joydev pcmcia snd_intel8x0 snd_intel8x0m snd_ac97_codec ac97_bus ieee80211 ieee80211_crypt snd_seq_dummy firmware_class yenta_socket rsrc_nonstatic pcmcia_core serio_raw snd_pcm_oss snd_mixer_oss i2c_i801 pcspkr psmouse i2c_core snd_pcm snd_seq_midi snd_seq_oss iTCO_wdt snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd rng_core soundcore snd_page_alloc video output button battery ac intel_agp agpgart evdev dcdbas ext3 jbd mbcache ide_cd_mod cdrom ide_disk ide_pci_generic piix ide_core ata_generic libata scsi_mod dock e100 mii ehci_hcd uhci_hcd usbcore thermal processor fan thermal_sys [last unloaded: ipw2200]
> > [39071.159742] Pid: 8890, comm: umount Not tainted 2.6.26-1-686 #1
> > [39071.159751]  [<c012242b>] warn_on_slowpath+0x40/0x66
> > [39071.159770]  [<c01d1c0c>] generic_make_request+0x34d/0x37b
> > [39071.159787]  [<f892d304>] ext3_getblk+0x9f/0x17d [ext3]
> > [39071.159811]  [<c0158949>] mempool_alloc+0x1c/0xba
> > [39071.159822]  [<c01d2ce8>] submit_bio+0xc6/0xcd
> > [39071.159831]  [<c0158929>] mempool_free+0x63/0x67
> > [39071.159843]  [<c01900a8>] mark_buffer_dirty+0x20/0x6a
> > [39071.159849]  [<f887ec2c>] journal_update_superblock+0x59/0x97 [jbd]
> > [39071.159865]  [<f887db43>] cleanup_journal_tail+0xac/0xb1 [jbd]
> > [39071.159877]  [<f887de27>] log_do_checkpoint+0x2a8/0x2ee [jbd]
> > [39071.159890]  [<c01564fe>] find_get_pages_tag+0x2a/0x6e
> > [39071.159901]  [<c01564fe>] find_get_pages_tag+0x2a/0x6e
> > [39071.159908]  [<c0135eec>] getnstimeofday+0x37/0xbc
> > [39071.159919]  [<c01df8c4>] rb_insert_color+0x4c/0xad
> > [39071.159929]  [<c0133c2e>] enqueue_hrtimer+0xc9/0xd4
> > [39071.159938]  [<c01341f6>] hrtimer_start+0xf7/0x110
> > [39071.159948]  [<c011d36d>] hrtick_set+0x8f/0xd8
> > [39071.159957]  [<c02b7eb8>] schedule+0x64e/0x66f
> > [39071.159976]  [<f887f6fc>] journal_destroy+0xc7/0x163 [jbd]
> > [39071.160040]  [<c013177c>] autoremove_wake_function+0x0/0x2d
> > [39071.160051]  [<f8933f16>] ext3_put_super+0x1f/0x169 [ext3]
> > [39071.160071]  [<c0175a85>] generic_shutdown_super+0x4f/0xc8
> > [39071.160078]  [<c019ebe3>] vfs_quota_off+0x0/0x518
> > [39071.160084]  [<c0175b0a>] kill_block_super+0xc/0x1b
> > [39071.160090]  [<c0175ba9>] deactivate_super+0x4b/0x60
> > [39071.160097]  [<c0186ca7>] sys_umount+0x282/0x2c8
> > [39071.160105]  [<c010f6a1>] flush_tlb_mm+0x39/0x60
> > [39071.160119]  [<c0115afb>] do_page_fault+0x29b/0x5b8
> > [39071.160132]  [<c0103853>] sysenter_past_esp+0x78/0xb1
> > [39071.160144]  [<c02b0000>] virtcons_probe+0xd6/0xdd
> > [39071.160154]  =======================
> > [39071.160157] ---[ end trace c45f2bacd26f4247 ]---
> > [39071.160167] Buffer I/O error on device sda1, logical block 1545
> > [39071.160170] lost page write due to I/O error on sda1
> > [39071.160184] Buffer I/O error on device sda1, logical block 1545
> > [39071.160187] lost page write due to I/O error on sda1
> > [39071.160197] Buffer I/O error on device sda1, logical block 1545
> > [39071.160201] lost page write due to I/O error on sda1
> > [39071.160210] Buffer I/O error on device sda1, logical block 1545
> > [39071.160213] lost page write due to I/O error on sda1
> > [39071.160223] Buffer I/O error on device sda1, logical block 1545
> > [39071.160226] lost page write due to I/O error on sda1
> > [39071.160235] Buffer I/O error on device sda1, logical block 1545
> > [39071.160238] lost page write due to I/O error on sda1
> > [39071.160247] Buffer I/O error on device sda1, logical block 1545
> > [39071.160251] lost page write due to I/O error on sda1
> > [39071.160259] Buffer I/O error on device sda1, logical block 1545
> > [39071.160262] lost page write due to I/O error on sda1
> > [39071.160272] Buffer I/O error on device sda1, logical block 1545
> > [39071.160275] lost page write due to I/O error on sda1
> > [39140.700073] usb 5-1: new high speed USB device using ehci_hcd and address 4
> > [39140.946003] usb 5-1: configuration #1 chosen from 1 choice
> > [39140.948029] scsi2 : SCSI emulation for USB Mass Storage devices
> > [39140.949899] usb 5-1: New USB device found, idVendor=067b, idProduct=3507
> > [39140.949909] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > [39140.949914] usb 5-1: Product: PL-3507C USB Storage Device
> > [39140.949917] usb 5-1: Manufacturer: Prolific
> > [39140.949920] usb 5-1: SerialNumber: 01201290
> > [39140.950566] usb-storage: device found at 4
> > [39140.950573] usb-storage: waiting for device to settle before scanning
> > [39145.948337] usb-storage: device scan complete
(...)
> Thanks for caring about this bug (if it is a bug).

Well, it is a bug. It just needs more investigation to see where the bug
lies.


Regards, Rogério.

-- 
Rogério Brito : rbrito@...ckenzie,ime.usp}.br : GPG key 1024D/7C2CAEB8
http://www.ime.usp.br/~rbrito : http://meusite.mackenzie.com.br/rbrito
Projects: algorithms.berlios.de : lame.sf.net : vrms.alioth.debian.org
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