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Bug#626189: marked as done (linux-image-2.6.32-5-xen-686: kernel BUG (invalid opcode) on reboot -f)

Your message dated Sun, 29 May 2016 21:24:52 +0100
with message-id bb988196-8498-43db-9385-1ade81a5117f@decadent.org.uk
and subject line Closing bugs assigned to linux-2.6 package
has caused the Debian Bug report #599615,
regarding linux-image-2.6.32-5-xen-686: kernel BUG (invalid opcode) on reboot -f
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
599615: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=599615
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-image-2.6.32-5-xen-686
Version: 2.6.32-31
Severity: normal

Hi,

As a STONITH measure, I issued reboot -f on a Xen dom0 while several
domUs were running.  This didn't kill the machine but resulted in the
BUGs below, and made further interaction impossible, although the kernel
was running and some firewall logs even made it through the syslog daemon.
Of course I didn't try to reproduce the issue (it's a production system in
active/backup HA), but I'm willing to do further experiments that don't
risk further data loss if needed.  This happened on a perfectly stock and
up-to-date squeeze Xen system running several PV guests.

Thanks,
Feri.

[527638.438831] md: stopping all md devices.
[527638.438971] md: md1 switched to read-only mode.
[527638.439256] md: md0 switched to read-only mode.
[527639.452674] xenbus_dev_shutdown: backend/console/10/0: Initialising != Connected, skipping
[527644.461066] xenbus_dev_shutdown: backend/vif/10/0 timeout closing device
[527649.464084] xenbus_dev_shutdown: backend/vbd/10/51712 timeout closing device
[527649.464166] xenbus_dev_shutdown: backend/console/9/0: Initialising != Connected, skipping
[527654.469068] xenbus_dev_shutdown: backend/vif/9/0 timeout closing device
[527659.473064] xenbus_dev_shutdown: backend/vbd/9/51712 timeout closing device
[527659.473146] xenbus_dev_shutdown: backend/console/8/0: Initialising != Connected, skipping
[527664.477114] xenbus_dev_shutdown: backend/vif/8/0 timeout closing device
[527669.481109] xenbus_dev_shutdown: backend/vbd/8/51712 timeout closing device
[527669.481191] xenbus_dev_shutdown: backend/console/7/0: Initialising != Connected, skipping
[527671.204239] ------------[ cut here ]------------
[527671.204318] kernel BUG at /build/buildd-linux-2.6_2.6.32-31-i386-qYaaJr/linux-2.6-2.6.32/debian/build/source_i386_xen/drivers/md/md.c:6199!
[527671.204417] invalid opcode: 0000 [#1] SMP 
[527671.204542] last sysfs file: /sys/devices/pci0000:01/0000:01:06.0/host2/rport-2:0-1/target2:0:1/2:0:1:11/state
[527671.204633] Modules linked in: xt_physdev xen_evtchn xenfs bridge 8021q garp stp bonding ip6t_REJECT ip6t_LOG nf_conntrack_ipv6 ip6table_filter ip6_tables xt_recent ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp ipt_LOG xt_limit xt_multiport iptable_filter ip_tables ebtable_filter ebtables x_tables ext2 mbcache dm_round_robin scsi_dh_emc dm_multipath scsi_dh ipmi_devintf ipmi_si ipmi_msghandler snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr shpchp evdev pci_hotplug psmouse dcdbas serio_raw pl2303 usbserial i2c_piix4 button i2c_core processor acpi_processor xfs exportfs dm_mod raid1 md_mod sd_mod crc_t10dif sg sr_mod cdrom ata_generic qla2xxx ohci_hcd aic7xxx scsi_transport_spi pata_serverworks scsi_transport_fc ehci_hcd libata scsi_tgt usbcore nls_base tg3 libphy floppy scsi_mod thermal thermal_sys [last unloaded: scsi_wait_scan]
[527671.206298] 
[527671.206353] Pid: 16345, comm: flush-253:0 Not tainted (2.6.32-5-xen-686 #1) PowerEdge 2650             
[527671.206470] EIP: 0061:[<d0a5390a>] EFLAGS: 00010246 CPU: 2
[527671.206562] EIP is at md_write_start+0x1b/0x140 [md_mod]
[527671.206643] EAX: 00000001 EBX: c2396400 ECX: d08f69c8 EDX: cf9f7000
[527671.206704] ESI: 000004c1 EDI: cf9f7000 EBP: c2300530 ESP: ca3d9cd8
[527671.206761]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0069
[527671.206819] Process flush-253:0 (pid: 16345, ti=ca3d8000 task=cfab0440 task.ti=ca3d8000)
[527671.206902] Stack:
[527671.206945]  cbc7e7f0 0000005d 00000040 cbc70000 cbc7e7f0 c2396420 000004c1 cf9f7000
[527671.207133] <0> c2300530 d08f5d9d c1450050 c100676f cf9f7000 c219df00 c2396400 ce0d6510
[527671.207333] <0> cf830cc0 cfab0684 c300bea0 cf5aa128 00000009 c108eb9e c2e85da0 d08cd020
[527671.207566] Call Trace:
[527671.207626]  [<d08f5d9d>] ? make_request+0x27/0x6dd [raid1]
[527671.207701]  [<c100676f>] ? xen_restore_fl_direct_end+0x0/0x1
[527671.207765]  [<c108eb9e>] ? find_get_page+0x1f/0x85
[527671.207835]  [<d0a552e6>] ? md_make_request+0xa4/0xd8 [md_mod]
[527671.207922]  [<c11316c5>] ? generic_make_request+0x266/0x2b4
[527671.208020]  [<d09d18bb>] ? dm_merge_bvec+0xfd/0x13d [dm_mod]
[527671.208028]  [<d09d18da>] ? dm_merge_bvec+0x11c/0x13d [dm_mod]
[527671.208028]  [<d09d17be>] ? dm_merge_bvec+0x0/0x13d [dm_mod]
[527671.208028]  [<c10d9699>] ? __bio_add_page+0x155/0x220
[527671.208028]  [<c10908c6>] ? mempool_alloc+0x3b/0xdd
[527671.208028]  [<c11317cf>] ? submit_bio+0xbc/0xd6
[527671.208028]  [<c10d978c>] ? bio_add_page+0x28/0x2e
[527671.208028]  [<d0b2d84b>] ? _xfs_buf_ioapply+0x206/0x22b [xfs]
[527671.208028]  [<d0b2e254>] ? xfs_buf_iorequest+0x38/0x60 [xfs]
[527671.208028]  [<d0b31809>] ? xfs_bdstrat_cb+0x32/0x35 [xfs]
[527671.208028]  [<d0b15aa1>] ? xfs_iflush+0x1d9/0x236 [xfs]
[527671.208028]  [<d0b32d95>] ? xfs_fs_write_inode+0xbd/0xf1 [xfs]
[527671.208028]  [<c10d181a>] ? writeback_single_inode+0xf8/0x273
[527671.208028]  [<c10d2354>] ? writeback_inodes_wb+0x3dd/0x49c
[527671.208028]  [<c10d2528>] ? wb_writeback+0x115/0x178
[527671.208028]  [<c10d272f>] ? wb_do_writeback+0x121/0x131
[527671.208028]  [<c1042967>] ? process_timeout+0x0/0x5
[527671.208028]  [<c10d2760>] ? bdi_writeback_task+0x21/0x89
[527671.208028]  [<c109fa85>] ? bdi_start_fn+0x59/0xa4
[527671.208028]  [<c109fa2c>] ? bdi_start_fn+0x0/0xa4
[527671.208028]  [<c104b348>] ? kthread+0x61/0x66
[527671.208028]  [<c104b2e7>] ? kthread+0x0/0x66
[527671.208028]  [<c1009b07>] ? kernel_thread_helper+0x7/0x10
[527671.208028] Code: eb 05 b9 fe ff ff ff 5a 89 c8 59 5b 5e 5f 5d c3 55 57 56 53 89 c3 83 ec 14 f6 42 14 01 0f 84 25 01 00 00 8b 40 24 83 f8 01 75 04 <0f> 0b eb fe 31 ff 83 f8 02 75 30 c7 43 24 00 00 00 00 8d 83 48 
[527671.208028] EIP: [<d0a5390a>] md_write_start+0x1b/0x140 [md_mod] SS:ESP 0069:ca3d9cd8
[527671.208028] ---[ end trace 3e0021f3cbea08f1 ]---
[527671.268386] ------------[ cut here ]------------
[527671.268563] kernel BUG at /build/buildd-linux-2.6_2.6.32-31-i386-qYaaJr/linux-2.6-2.6.32/debian/build/source_i386_xen/drivers/md/md.c:6199!
[527671.268762] invalid opcode: 0000 [#2] SMP 
[527671.269099] last sysfs file: /sys/devices/pci0000:01/0000:01:06.0/host2/rport-2:0-1/target2:0:1/2:0:1:11/state
[527671.269285] Modules linked in: xt_physdev xen_evtchn xenfs bridge 8021q garp stp bonding ip6t_REJECT ip6t_LOG nf_conntrack_ipv6 ip6table_filter ip6_tables xt_recent ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp ipt_LOG xt_limit xt_multiport iptable_filter ip_tables ebtable_filter ebtables x_tables ext2 mbcache dm_round_robin scsi_dh_emc dm_multipath scsi_dh ipmi_devintf ipmi_si ipmi_msghandler snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr shpchp evdev pci_hotplug psmouse dcdbas serio_raw pl2303 usbserial i2c_piix4 button i2c_core processor acpi_processor xfs exportfs dm_mod raid1 md_mod sd_mod crc_t10dif sg sr_mod cdrom ata_generic qla2xxx ohci_hcd aic7xxx scsi_transport_spi pata_serverworks scsi_transport_fc ehci_hcd libata scsi_tgt usbcore nls_base tg3 libphy floppy scsi_mod thermal thermal_sys [last unloaded: scsi_wait_scan]
[527671.272028] 
[527671.272028] Pid: 16424, comm: flush-253:29 Tainted: G      D    (2.6.32-5-xen-686 #1) PowerEdge 2650             
[527671.272028] EIP: 0061:[<d0a5390a>] EFLAGS: 00010246 CPU: 0
[527671.272028] EIP is at md_write_start+0x1b/0x140 [md_mod]
[527671.272028] EAX: 00000001 EBX: c2396400 ECX: d08f69c8 EDX: ce803700
[527671.272028] ESI: 000004c1 EDI: ce803700 EBP: c2300530 ESP: cdabbcd8
[527671.272028]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0069
[527671.272028] Process flush-253:29 (pid: 16424, ti=cdaba000 task=c17d61c0 task.ti=cdaba000)
[527671.272028] Stack:
[527671.272028]  cbcbfc00 0000005d 00000040 cbcb0000 cbcbfc00 c2396420 000004c1 ce803700
[527671.272028] <0> c2300530 d08f5d9d c1450050 c100676f ce803700 c219df00 c2396400 cd199be8
[527671.272028] <0> cf830cc0 c17d6404 c306f780 cf754b28 00000009 c108eb9e c2fed0c0 d0bd2020
[527671.272028] Call Trace:
[527671.272028]  [<d08f5d9d>] ? make_request+0x27/0x6dd [raid1]
[527671.272028]  [<c100676f>] ? xen_restore_fl_direct_end+0x0/0x1
[527671.272028]  [<c108eb9e>] ? find_get_page+0x1f/0x85
[527671.272028]  [<d0a552e6>] ? md_make_request+0xa4/0xd8 [md_mod]
[527671.272028]  [<c11316c5>] ? generic_make_request+0x266/0x2b4
[527671.272028]  [<d09d18bb>] ? dm_merge_bvec+0xfd/0x13d [dm_mod]
[527671.272028]  [<d09d18da>] ? dm_merge_bvec+0x11c/0x13d [dm_mod]
[527671.272028]  [<d09d17be>] ? dm_merge_bvec+0x0/0x13d [dm_mod]
[527671.272028]  [<c10d9699>] ? __bio_add_page+0x155/0x220
[527671.272028]  [<c10908c6>] ? mempool_alloc+0x3b/0xdd
[527671.272028]  [<c11317cf>] ? submit_bio+0xbc/0xd6
[527671.272028]  [<c10d978c>] ? bio_add_page+0x28/0x2e
[527671.272028]  [<d0b2d84b>] ? _xfs_buf_ioapply+0x206/0x22b [xfs]
[527671.272028]  [<d0b2e254>] ? xfs_buf_iorequest+0x38/0x60 [xfs]
[527671.272028]  [<d0b31809>] ? xfs_bdstrat_cb+0x32/0x35 [xfs]
[527671.272028]  [<d0b15aa1>] ? xfs_iflush+0x1d9/0x236 [xfs]
[527671.272028]  [<d0b32d95>] ? xfs_fs_write_inode+0xbd/0xf1 [xfs]
[527671.272028]  [<c10d181a>] ? writeback_single_inode+0xf8/0x273
[527671.272028]  [<c10d2354>] ? writeback_inodes_wb+0x3dd/0x49c
[527671.272028]  [<c10d2528>] ? wb_writeback+0x115/0x178
[527671.272028]  [<c10d272f>] ? wb_do_writeback+0x121/0x131
[527671.272028]  [<c1042967>] ? process_timeout+0x0/0x5
[527671.272028]  [<c10d2760>] ? bdi_writeback_task+0x21/0x89
[527671.272028]  [<c109fa85>] ? bdi_start_fn+0x59/0xa4
[527671.272028]  [<c109fa2c>] ? bdi_start_fn+0x0/0xa4
[527671.272028]  [<c104b348>] ? kthread+0x61/0x66
[527671.272028]  [<c104b2e7>] ? kthread+0x0/0x66
[527671.272028]  [<c1009b07>] ? kernel_thread_helper+0x7/0x10
[527671.272028] Code: eb 05 b9 fe ff ff ff 5a 89 c8 59 5b 5e 5f 5d c3 55 57 56 53 89 c3 83 ec 14 f6 42 14 01 0f 84 25 01 00 00 8b 40 24 83 f8 01 75 04 <0f> 0b eb fe 31 ff 83 f8 02 75 30 c7 43 24 00 00 00 00 8d 83 48 
[527671.272028] EIP: [<d0a5390a>] md_write_start+0x1b/0x140 [md_mod] SS:ESP 0069:cdabbcd8
[527671.272028] ---[ end trace 3e0021f3cbea08f2 ]---
[527671.272034] ------------[ cut here ]------------
[527671.272034] kernel BUG at /build/buildd-linux-2.6_2.6.32-31-i386-qYaaJr/linux-2.6-2.6.32/debian/build/source_i386_xen/drivers/md/md.c:6199!
[527671.272034] invalid opcode: 0000 [#3] SMP 
[527671.272034] last sysfs file: /sys/devices/pci0000:01/0000:01:06.0/host2/rport-2:0-1/target2:0:1/2:0:1:11/state
[527671.272034] Modules linked in: xt_physdev xen_evtchn xenfs bridge 8021q garp stp bonding ip6t_REJECT ip6t_LOG nf_conntrack_ipv6 ip6table_filter ip6_tables xt_recent ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp ipt_LOG xt_limit xt_multiport iptable_filter ip_tables ebtable_filter ebtables x_tables ext2 mbcache dm_round_robin scsi_dh_emc dm_multipath scsi_dh ipmi_devintf ipmi_si ipmi_msghandler snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr shpchp evdev pci_hotplug psmouse dcdbas serio_raw pl2303 usbserial i2c_piix4 button i2c_core processor acpi_processor xfs exportfs dm_mod raid1 md_mod sd_mod crc_t10dif sg sr_mod cdrom ata_generic qla2xxx ohci_hcd aic7xxx scsi_transport_spi pata_serverworks scsi_transport_fc ehci_hcd libata scsi_tgt usbcore nls_base tg3 libphy floppy scsi_mod thermal thermal_sys [last unloaded: scsi_wait_scan]
[527671.272034] 
[527671.272034] Pid: 1870, comm: kdmflush Tainted: G      D    (2.6.32-5-xen-686 #1) PowerEdge 2650             
[527671.272034] EIP: 0061:[<d0a5390a>] EFLAGS: 00010246 CPU: 2
[527671.272034] EIP is at md_write_start+0x1b/0x140 [md_mod]
[527671.272034] EAX: 00000001 EBX: c2396400 ECX: d08f69c8 EDX: cf9f7500
[527671.272034] ESI: 00000021 EDI: cf9f7500 EBP: c2300530 ESP: cc919da8
[527671.272034]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0069
[527671.272034] Process kdmflush (pid: 1870, ti=cc918000 task=cfdaa640 task.ti=cc918000)
[527671.272034] Stack:
[527671.272034]  0001dfe9 d14411be 0001dfe9 c1021407 d14411be c2396420 00000021 cf9f7500
[527671.272034] <0> c2300530 d08f5d9d 0001dfea 0a8042b0 cf9f7500 c219df00 c2396400 cff6aa80
[527671.272034] <0> c30a1320 cff6aaac c30b0e58 00000001 c30b0e20 c102ce6b 9b4986df 00008a06
[527671.272034] Call Trace:
[527671.272034]  [<c1021407>] ? pvclock_clocksource_read+0xf9/0x10f
[527671.272034]  [<d08f5d9d>] ? make_request+0x27/0x6dd [raid1]
[527671.272034]  [<c102ce6b>] ? enqueue_entity+0x82/0x129
[527671.272034]  [<c11992d1>] ? HYPERVISOR_event_channel_op+0x15/0x4c
[527671.272034]  [<c102dcd6>] ? enqueue_task_fair+0x38/0x6d
[527671.272034]  [<d0a552e6>] ? md_make_request+0xa4/0xd8 [md_mod]
[527671.272034]  [<c10902c6>] ? generic_file_aio_read+0x362/0x57b
[527671.272034]  [<c100676f>] ? xen_restore_fl_direct_end+0x0/0x1
[527671.272034]  [<c10b7020>] ? kmem_cache_alloc+0x79/0xe5
[527671.272034]  [<c11316c5>] ? generic_make_request+0x266/0x2b4
[527671.272034]  [<c10908c6>] ? mempool_alloc+0x3b/0xdd
[527671.272034]  [<d09d01e4>] ? __map_bio+0x35/0xdd [dm_mod]
[527671.272034]  [<d09d0fbf>] ? __split_and_process_bio+0x1c6/0x6c5 [dm_mod]
[527671.272034]  [<c128f229>] ? _spin_unlock_irqrestore+0xd/0xf
[527671.272034]  [<d0a5223e>] ? md_wakeup_thread+0x22/0x24 [md_mod]
[527671.272034]  [<c112bc9c>] ? blk_unplug+0x2e/0x31
[527671.272034]  [<c1006778>] ? check_events+0x8/0xc
[527671.272034]  [<c1006048>] ? xen_force_evtchn_callback+0xc/0x10
[527671.272034]  [<c1006778>] ? check_events+0x8/0xc
[527671.272034]  [<c103457e>] ? default_wake_function+0x0/0x8
[527671.272034]  [<d09d14f8>] ? dm_flush+0x3a/0x48 [dm_mod]
[527671.272034]  [<d09d1599>] ? dm_wq_work+0x93/0x114 [dm_mod]
[527671.272034]  [<c1048843>] ? worker_thread+0x141/0x1bd
[527671.272034]  [<d09d1506>] ? dm_wq_work+0x0/0x114 [dm_mod]
[527671.272034]  [<c104b57a>] ? autoremove_wake_function+0x0/0x2d
[527671.272034]  [<c1048702>] ? worker_thread+0x0/0x1bd
[527671.272034]  [<c104b348>] ? kthread+0x61/0x66
[527671.272034]  [<c104b2e7>] ? kthread+0x0/0x66
[527671.272034]  [<c1009b07>] ? kernel_thread_helper+0x7/0x10
[527671.272034] Code: eb 05 b9 fe ff ff ff 5a 89 c8 59 5b 5e 5f 5d c3 55 57 56 53 89 c3 83 ec 14 f6 42 14 01 0f 84 25 01 00 00 8b 40 24 83 f8 01 75 04 <0f> 0b eb fe 31 ff 83 f8 02 75 30 c7 43 24 00 00 00 00 8d 83 48 
[527671.272034] EIP: [<d0a5390a>] md_write_start+0x1b/0x140 [md_mod] SS:ESP 0069:cc919da8
[527671.272034] ---[ end trace 3e0021f3cbea08f3 ]---
[527671.305394] ------------[ cut here ]------------
[527671.305591] kernel BUG at /build/buildd-linux-2.6_2.6.32-31-i386-qYaaJr/linux-2.6-2.6.32/debian/build/source_i386_xen/drivers/md/md.c:6199!
[527671.305826] invalid opcode: 0000 [#4] SMP 
[527671.306258] last sysfs file: /sys/devices/pci0000:01/0000:01:06.0/host2/rport-2:0-1/target2:0:1/2:0:1:11/state
[527671.306484] Modules linked in: xt_physdev xen_evtchn xenfs bridge 8021q garp stp bonding ip6t_REJECT ip6t_LOG nf_conntrack_ipv6 ip6table_filter ip6_tables xt_recent ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp ipt_LOG xt_limit xt_multiport iptable_filter ip_tables ebtable_filter ebtables x_tables ext2 mbcache dm_round_robin scsi_dh_emc dm_multipath scsi_dh ipmi_devintf ipmi_si ipmi_msghandler snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr shpchp evdev pci_hotplug psmouse dcdbas serio_raw pl2303 usbserial i2c_piix4 button i2c_core processor acpi_processor xfs exportfs dm_mod raid1 md_mod sd_mod crc_t10dif sg sr_mod cdrom ata_generic qla2xxx ohci_hcd aic7xxx scsi_transport_spi pata_serverworks scsi_transport_fc ehci_hcd libata scsi_tgt usbcore nls_base tg3 libphy floppy scsi_mod thermal thermal_sys [last unloaded: scsi_wait_scan]
[527671.309292] 
[527671.309292] Pid: 16884, comm: flush-253:27 Tainted: G      D    (2.6.32-5-xen-686 #1) PowerEdge 2650             
[527671.309292] EIP: 0061:[<d0a5390a>] EFLAGS: 00010246 CPU: 2
[527671.309292] EIP is at md_write_start+0x1b/0x140 [md_mod]
[527671.309292] EAX: 00000001 EBX: c2396400 ECX: d08f69c8 EDX: cf9f7a80
[527671.309292] ESI: 000004c1 EDI: cf9f7a80 EBP: c2300530 ESP: ca177cd8
[527671.309292]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0069
[527671.309292] Process flush-253:27 (pid: 16884, ti=ca176000 task=c17d3fc0 task.ti=ca176000)
[527671.309292] Stack:
[527671.309292]  cbc7e7b0 0000005d 00000040 cbc70000 cbc7e7b0 c2396420 000004c1 cf9f7a80
[527671.309292] <0> c2300530 d08f5d9d c1450050 c100676f cf9f7a80 c219df00 c2396400 ce0d6900
[527671.309292] <0> cf830cc0 c17d4204 c2f8cf60 cf754d28 00000009 c108eb9e c3024c00 d0bc6020
[527671.309292] Call Trace:
[527671.309292]  [<d08f5d9d>] ? make_request+0x27/0x6dd [raid1]
[527671.309292]  [<c100676f>] ? xen_restore_fl_direct_end+0x0/0x1
[527671.309292]  [<c108eb9e>] ? find_get_page+0x1f/0x85
[527671.309292]  [<d0a552e6>] ? md_make_request+0xa4/0xd8 [md_mod]
[527671.309292]  [<c11316c5>] ? generic_make_request+0x266/0x2b4
[527671.309292]  [<d09d18bb>] ? dm_merge_bvec+0xfd/0x13d [dm_mod]
[527671.309292]  [<d09d18da>] ? dm_merge_bvec+0x11c/0x13d [dm_mod]
[527671.309292]  [<d09d17be>] ? dm_merge_bvec+0x0/0x13d [dm_mod]
[527671.309292]  [<c10d9699>] ? __bio_add_page+0x155/0x220
[527671.309292]  [<c10908c6>] ? mempool_alloc+0x3b/0xdd
[527671.309292]  [<c11317cf>] ? submit_bio+0xbc/0xd6
[527671.309292]  [<c10d978c>] ? bio_add_page+0x28/0x2e
[527671.309292]  [<d0b2d84b>] ? _xfs_buf_ioapply+0x206/0x22b [xfs]
[527671.309292]  [<d0b2e254>] ? xfs_buf_iorequest+0x38/0x60 [xfs]
[527671.309292]  [<d0b31809>] ? xfs_bdstrat_cb+0x32/0x35 [xfs]
[527671.309292]  [<d0b15aa1>] ? xfs_iflush+0x1d9/0x236 [xfs]
[527671.309292]  [<d0b32d95>] ? xfs_fs_write_inode+0xbd/0xf1 [xfs]
[527671.309292]  [<c10d181a>] ? writeback_single_inode+0xf8/0x273
[527671.309292]  [<c10d2354>] ? writeback_inodes_wb+0x3dd/0x49c
[527671.309292]  [<c10d2528>] ? wb_writeback+0x115/0x178
[527671.309292]  [<c10d272f>] ? wb_do_writeback+0x121/0x131
[527671.309292]  [<c1042967>] ? process_timeout+0x0/0x5
[527671.309292]  [<c10d2760>] ? bdi_writeback_task+0x21/0x89
[527671.309292]  [<c109fa85>] ? bdi_start_fn+0x59/0xa4
[527671.309292]  [<c109fa2c>] ? bdi_start_fn+0x0/0xa4
[527671.309292]  [<c104b348>] ? kthread+0x61/0x66
[527671.309292]  [<c104b2e7>] ? kthread+0x0/0x66
[527671.309292]  [<c1009b07>] ? kernel_thread_helper+0x7/0x10
[527671.309292] Code: eb 05 b9 fe ff ff ff 5a 89 c8 59 5b 5e 5f 5d c3 55 57 56 53 89 c3 83 ec 14 f6 42 14 01 0f 84 25 01 00 00 8b 40 24 83 f8 01 75 04 <0f> 0b eb fe 31 ff 83 f8 02 75 30 c7 43 24 00 00 00 00 8d 83 48 
[527671.309292] EIP: [<d0a5390a>] md_write_start+0x1b/0x140 [md_mod] SS:ESP 0069:ca177cd8
[527671.309292] ---[ end trace 3e0021f3cbea08f4 ]---
[527674.485190] xenbus_dev_shutdown: backend/vif/7/0 timeout closing device
[527705.028364] Firewall heartbeat: IN=bond0 OUT= MAC=00:06:5b:8e:72:72:00:06:5b:8e:71:d5:08:00 SRC=10.253.2.7 DST=10.253.2.8 LEN=236 TOS=0x10 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=38631 DPT=694 LEN=216

--- End Message ---
--- Begin Message --- 
Version: 3.4.1-1~experimental.1+rm

Debian 6.0 Long Term Support has ended, and the 'linux-2.6' source
package will no longer be updated.  This bug was reassigned to the
'linux' source package earlier today, but I am now closing it on the
assumption that it does not affect the kernel versions in newer Debian
releases.

If you can still reproduce this bug in a newer release, please reopen
the bug report and reassign it to 'src:linux' and the affected version
of the package.  You can find the package version for the running
kernel by running:

    uname -v

or the versions of all installed kernel packages by running:

    dpkg -l 'linux-image-[34]*' | grep ^.i

and looking at the third column.

I apologise that we weren't able to provide a specific resolution for
this bug.

Ben.

-- 
Ben Hutchings - Debian developer, member of Linux kernel and LTS teams

--- End Message ---
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