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Re: [Linux-cluster] Re: Hard lockups during file transfer to GNBD/GFS device



On 10/10/06, David Brieck Jr. <dbrieck gmail com> wrote:
On 9/29/06, David Brieck Jr. <dbrieck gmail com> wrote:
> On 9/28/06, David Teigland <teigland redhat com> wrote:
> >
> > Could you try it without multipath?  You have quite a few layers there.
> > Dave
> >
> >
>
> Thanks for the response. I unloaded gfs, clvm, gnbd and multipath, the
> reloaded gnbd, clvm and gfs. It was only talking to one of the gnbd
> servers and without multipath. Here's the log from this crash. It
> seems to have more info in it.
>
> I'm kinda confused why it still has references to mulitpath though. I
> unloaded the multipath module so I'm not sure why it's still in there.
> SNIP

Since I didn't hear back from anyone I decided to try things a little
differently. Instead of rsyncing on the local machine, I ran the rsync
from another cluster member who also mounts the same partition I was
trying to move things too.

So instead of

rsync -a /path/to/files/ /mnt/http/

I used

rsync -a root 10 1 1 121::/path/to/files/  /mnt/http/

and I didn't have a crash at all. Why would this not cause a problem
when the first one did? Is this more of an rsync problem maybe? I do
have 2 NFS exports, could those have been causing the problem?

Thanks.


I am now seeing other crashes. Here's one from this weekend. It's huge
and I'm not even sure how to see where things might have gone wrong.
At the time of the crash the system was doing a backup to the gnbd
server (if that helps). I'd also appreciate it if maybe someone could
explain how to read this as far as where the problem actually started.

Thanks again.

Oct 22 00:17:56 db1 kernel: do_IRQ: stack overflow: 476
Oct 22 00:17:56 db1 kernel:  [<02107c6b>] do_IRQ+0x49/0x1ae
Oct 22 00:17:56 db1 kernel:  [<022cb5ea>] _read_unlock_bh+0x3/0x8
Oct 22 00:17:56 db1 kernel:  [<f8fea2bd>] do_bindings+0x9d/0x1e3 [iptable_nat]
Oct 22 00:17:56 db1 kernel:  [<f8fe91c6>] ip_nat_fn+0x1c6/0x1d4 [iptable_nat]
Oct 22 00:17:56 db1 kernel:  [<0228227b>] nf_iterate+0x40/0x81
Oct 22 00:17:56 db1 kernel:  [<022929c0>] ip_finish_output2+0x0/0x18d
Oct 22 00:17:56 db1 kernel:  [<02282581>] nf_hook_slow+0x47/0xbc
Oct 22 00:17:56 db1 kernel:  [<022929c0>] ip_finish_output2+0x0/0x18d
Oct 22 00:17:56 db1 kernel:  [<022929b7>] ip_finish_output+0x1c5/0x1ce
Oct 22 00:17:56 db1 kernel:  [<022929c0>] ip_finish_output2+0x0/0x18d
Oct 22 00:17:56 db1 kernel:  [<022927e7>] dst_output+0xf/0x1a
Oct 22 00:17:56 db1 kernel:  [<022825bd>] nf_hook_slow+0x83/0xbc
Oct 22 00:17:56 db1 kernel:  [<02293093>] ip_queue_xmit+0x395/0x3f9
Oct 22 00:17:56 db1 kernel:  [<022927d8>] dst_output+0x0/0x1a
Oct 22 00:17:56 db1 kernel:  [<022927e7>] dst_output+0xf/0x1a
Oct 22 00:17:56 db1 kernel:  [<022825bd>] nf_hook_slow+0x83/0xbc
Oct 22 00:17:56 db1 kernel:  [<02293093>] ip_queue_xmit+0x395/0x3f9
Oct 22 00:17:56 db1 kernel:  [<022927d8>] dst_output+0x0/0x1a
Oct 22 00:17:56 db1 kernel:  [<0211df36>] find_busiest_group+0xdd/0x295
Oct 22 00:17:56 db1 kernel:  [<022a62a7>] tcp_v4_send_check+0x7c/0xb9
Oct 22 00:17:56 db1 kernel:  [<022a10b1>] tcp_transmit_skb+0x6bf/0x7d2
Oct 22 00:17:56 db1 kernel:  [<022a19be>] tcp_write_xmit+0x74/0x254
Oct 22 00:17:56 db1 kernel:  [<0229ef8e>] __tcp_data_snd_check+0x3d/0xaa
Oct 22 00:17:56 db1 kernel:  [<0229f471>] tcp_rcv_established+0x166/0x725
Oct 22 00:17:56 db1 kernel:  [<022a72ce>] tcp_v4_do_rcv+0x1b/0xe9
Oct 22 00:17:56 db1 kernel:  [<02274c39>] __release_sock+0x39/0x55
Oct 22 00:17:56 db1 kernel:  [<022751b8>] release_sock+0x1f/0x4f
Oct 22 00:17:56 db1 kernel:  [<02277e42>] sk_stream_wait_memory+0x113/0x1a8
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<02297ca1>] tcp_sendmsg+0xb5c/0xe4d
Oct 22 00:17:56 db1 kernel:  [<022b2f5d>] inet_sendmsg+0x38/0x42
Oct 22 00:17:56 db1 kernel:  [<0227221f>] sock_sendmsg+0xdb/0xf7
Oct 22 00:17:56 db1 kernel:  [<02286b85>] qdisc_restart+0x12/0x1b9
Oct 22 00:17:56 db1 kernel:  [<f88df37d>]
bond_dev_queue_xmit+0x1f3/0x1fb [bonding]
Oct 22 00:17:56 db1 kernel:  [<f88e29bb>]
bond_xmit_roundrobin+0xdb/0xe3 [bonding]
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<f89e95c8>] sock_xmit+0x11d/0x217 [gnbd]
Oct 22 00:17:56 db1 kernel:  [<022929c0>] ip_finish_output2+0x0/0x18d
Oct 22 00:17:56 db1 kernel:  [<022927e7>] dst_output+0xf/0x1a
Oct 22 00:17:56 db1 kernel:  [<022825bd>] nf_hook_slow+0x83/0xbc
Oct 22 00:17:56 db1 kernel:  [<02141db2>] mempool_alloc+0x7b/0x135
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<f89e9938>] __gnbd_send_req+0x276/0x2e7 [gnbd]
Oct 22 00:17:56 db1 kernel:  [<f89e9dc0>] do_gnbd_request+0xfa/0x143 [gnbd]
Oct 22 00:17:56 db1 kernel:  [<02220380>] __generic_unplug_device+0x2b/0x2d
Oct 22 00:17:56 db1 kernel:  [<02220397>] generic_unplug_device+0x15/0x21
Oct 22 00:17:56 db1 kernel:  [<02220992>] get_request_wait+0x51/0xb9
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<022213c1>] __make_request+0x2bf/0x46c
Oct 22 00:17:56 db1 kernel:  [<022216fc>] generic_make_request+0x18e/0x19e
Oct 22 00:17:56 db1 kernel:  [<f88f623c>] multipath_map+0x64/0x7f [dm_multipath]
Oct 22 00:17:56 db1 kernel:  [<f88693ca>] __map_bio+0x35/0xb0 [dm_mod]
Oct 22 00:17:56 db1 kernel:  [<f88695cd>] __clone_and_map+0xc2/0x2f0 [dm_mod]
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<f88698a2>] __split_bio+0xa7/0x103 [dm_mod]
Oct 22 00:17:56 db1 kernel:  [<f8869a19>] dm_request+0x11b/0x130 [dm_mod]
Oct 22 00:17:56 db1 kernel:  [<022216fc>] generic_make_request+0x18e/0x19e
Oct 22 00:17:56 db1 kernel:  [<0215e848>] bio_clone+0x84/0x9c
Oct 22 00:17:56 db1 kernel:  [<f88693ca>] __map_bio+0x35/0xb0 [dm_mod]
Oct 22 00:17:56 db1 kernel:  [<f88695cd>] __clone_and_map+0xc2/0x2f0 [dm_mod]
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<f88698a2>] __split_bio+0xa7/0x103 [dm_mod]
Oct 22 00:17:56 db1 kernel:  [<f8869a19>] dm_request+0x11b/0x130 [dm_mod]
Oct 22 00:17:56 db1 kernel:  [<022216fc>] generic_make_request+0x18e/0x19e
Oct 22 00:17:56 db1 kernel:  [<0215e848>] bio_clone+0x84/0x9c
Oct 22 00:17:56 db1 kernel:  [<f8f2c3c1>] diaper_make_request+0x8b/0x91 [gfs]
Oct 22 00:17:56 db1 kernel:  [<022216fc>] generic_make_request+0x18e/0x19e
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<022217d6>] submit_bio+0xca/0xd2
Oct 22 00:17:56 db1 kernel:  [<0215e681>] bio_alloc+0x100/0x168
Oct 22 00:17:56 db1 kernel:  [<0215e038>] submit_bh+0x141/0x166
Oct 22 00:17:56 db1 kernel:  [<0215e0b9>] ll_rw_block+0x5c/0x72
Oct 22 00:17:56 db1 kernel:  [<f8f2d658>] gfs_dreread+0x65/0xd6 [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f2d5a4>] gfs_dread+0x20/0x36 [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f2e4ec>] gfs_get_meta_buffer+0xb1/0x250 [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f2a647>] gfs_block_map+0x242/0x3de [gfs]
Oct 22 00:17:56 db1 kernel:  [<022cad75>] __cond_resched+0x14/0x39
Oct 22 00:17:56 db1 kernel:  [<f8f49cd6>] get_block+0x2a/0x6d [gfs]
Oct 22 00:17:56 db1 kernel:  [<0215cd70>] __block_prepare_write+0x165/0x3ec
Oct 22 00:17:56 db1 kernel:  [<0215d682>] block_prepare_write+0x16/0x23
Oct 22 00:17:56 db1 kernel:  [<f8f49cac>] get_block+0x0/0x6d [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f4a258>] gfs_prepare_write+0x122/0x135 [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f49cac>] get_block+0x0/0x6d [gfs]
Oct 22 00:17:56 db1 kernel:  [<02140ec8>]
generic_file_buffered_write+0x218/0x533
Oct 22 00:17:56 db1 kernel:  [<02126347>] current_fs_time+0x44/0x4c
Oct 22 00:17:56 db1 kernel:  [<0214156c>]
__generic_file_aio_write_nolock+0x389/0x3b7
Oct 22 00:17:56 db1 kernel:  [<021415d3>]
generic_file_aio_write_nolock+0x39/0x7f
Oct 22 00:17:56 db1 kernel:  [<02141736>] generic_file_write_nolock+0x84/0x99
Oct 22 00:17:56 db1 kernel:  [<f8f38055>] gfs_glock_nq+0xe3/0x116 [gfs]
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<f8f58bac>] gfs_trans_begin_i+0xfd/0x15a [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f4c0fc>] do_do_write_buf+0x2a6/0x452 [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f4c3c3>] do_write_buf+0x11b/0x15e [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f4b31c>] walk_vm+0xd7/0x100 [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f4c4a7>] __gfs_write+0xa1/0xbb [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f4c2a8>] do_write_buf+0x0/0x15e [gfs]
Oct 22 00:17:56 db1 kernel:  [<f8f4c4cc>] gfs_write+0xb/0xe [gfs]
Oct 22 00:17:56 db1 kernel:  [<0215a52f>] vfs_write+0xb6/0xe2
Oct 22 00:17:56 db1 kernel:  [<0215a5f9>] sys_write+0x3c/0x62
Oct 22 00:17:56 db1 kernel:  =======================
Oct 22 00:17:56 db1 kernel: Unable to handle kernel paging request at
virtual address 000104e6
Oct 22 00:17:56 db1 kernel:  printing eip:
Oct 22 00:17:56 db1 kernel: 02105fc0
Oct 22 00:17:56 db1 kernel: *pde = 00004001
Oct 22 00:17:56 db1 kernel: Oops: 0000 [#1]
Oct 22 00:17:56 db1 kernel: SMP
Oct 22 00:17:56 db1 kernel: Modules linked in: ipt_REDIRECT
iptable_nat ip_conntrack iptable_mangle iptable_filter ip_tables
mptctl mptbase dell_rbu parport_
pc lp parport autofs4 i2c_dev i2c_core lock_dlm(U) gfs(U)
lock_harness(U) dm_round_robin gnbd(U) dlm(U) cman(U) sunrpc
ipmi_devintf ipmi_si ipmi_msghandler m
d5 ipv6 dm_mirror dm_multipath button battery ac joydev uhci_hcd
ehci_hcd hw_random e1000 bonding(U) floppy sg ext3 jbd dm_mod
megaraid_mbox megaraid_mm sd_m
od scsi_mod
Oct 22 00:17:56 db1 kernel: CPU:    35683031
Oct 22 00:17:56 db1 kernel: EIP:    0060:[<02105fc0>]    Not tainted VLI
Oct 22 00:17:56 db1 kernel: EFLAGS: 00010093   (2.6.9-42.0.2.ELhugemem)
Oct 22 00:17:56 db1 kernel: EIP is at show_trace+0x11/0x6b
Oct 22 00:17:56 db1 kernel: eax: 00010ffd   ebx: 000104e6   ecx:
a9dae200   edx: 022d65b8
Oct 22 00:17:56 db1 kernel: esi: 000104e6   edi: 00010000   ebp:
00000000   esp: a9dae200
Oct 22 00:17:56 db1 kernel: ds: 007b   es: 007b   ss: 0068
Oct 22 00:17:56 db1 kernel: Process  (pid: 122215904,
threadinfo=a9dae000 task=a9dae094)
Oct 22 00:17:56 db1 kernel: Stack: a9dae000 00005480 02385480 021060a4
0000001c 02107c6b 022d6d40 000001dc
Oct 22 00:17:56 db1 kernel:        c4dbbea0 000000a9 00000000 c4dbbe00
c4dbbea0 00000000 fffecca1 00000000
Oct 22 00:17:56 db1 kernel:        c4dbbea0 f8fee558 c4dbbe00 c4dbbea0
00000000 f8fee558 c4db007b 0000007b
Oct 22 00:17:56 db1 kernel: Call Trace:
Oct 22 00:17:56 db1 kernel:  [<021060a4>] dump_stack+0x11/0x13
Oct 22 00:17:56 db1 kernel:  [<02107c6b>] do_IRQ+0x49/0x1ae
Oct 22 00:17:56 db1 kernel:  [<022cb5ea>] _read_unlock_bh+0x3/0x8
Oct 22 00:17:56 db1 kernel:  [<f8fea2bd>] do_bindings+0x9d/0x1e3 [iptable_nat]
Oct 22 00:17:56 db1 kernel:  [<f8fe91c6>] ip_nat_fn+0x1c6/0x1d4 [iptable_nat]
Oct 22 00:17:56 db1 kernel:  [<0228227b>] nf_iterate+0x40/0x81
Oct 22 00:17:56 db1 kernel:  [<022929c0>] ip_finish_output2+0x0/0x18d
Oct 22 00:17:56 db1 kernel:  [<02282581>] nf_hook_slow+0x47/0xbc
Oct 22 00:17:56 db1 kernel:  [<022929c0>] ip_finish_output2+0x0/0x18d
Oct 22 00:17:56 db1 kernel:  [<022929b7>] ip_finish_output+0x1c5/0x1ce
Oct 22 00:17:56 db1 kernel:  [<022929c0>] ip_finish_output2+0x0/0x18d
Oct 22 00:17:56 db1 kernel:  [<022927e7>] dst_output+0xf/0x1a
Oct 22 00:17:56 db1 kernel:  [<022825bd>] nf_hook_slow+0x83/0xbc
Oct 22 00:17:56 db1 kernel:  [<02293093>] ip_queue_xmit+0x395/0x3f9
Oct 22 00:17:56 db1 kernel:  [<022927d8>] dst_output+0x0/0x1a
Oct 22 00:17:56 db1 kernel:  [<022927e7>] dst_output+0xf/0x1a
Oct 22 00:17:56 db1 kernel:  [<022825bd>] nf_hook_slow+0x83/0xbc
Oct 22 00:17:56 db1 kernel:  [<02293093>] ip_queue_xmit+0x395/0x3f9
Oct 22 00:17:56 db1 kernel:  [<022927d8>] dst_output+0x0/0x1a
Oct 22 00:17:56 db1 kernel:  [<0211df36>] find_busiest_group+0xdd/0x295
Oct 22 00:17:56 db1 kernel:  [<022a62a7>] tcp_v4_send_check+0x7c/0xb9
Oct 22 00:17:56 db1 kernel:  [<022a10b1>] tcp_transmit_skb+0x6bf/0x7d2
Oct 22 00:17:56 db1 kernel:  [<022a19be>] tcp_write_xmit+0x74/0x254
Oct 22 00:17:56 db1 kernel:  [<0229ef8e>] __tcp_data_snd_check+0x3d/0xaa
Oct 22 00:17:56 db1 kernel:  [<0229f471>] tcp_rcv_established+0x166/0x725
Oct 22 00:17:56 db1 kernel:  [<022a72ce>] tcp_v4_do_rcv+0x1b/0xe9
Oct 22 00:17:56 db1 kernel:  [<02274c39>] __release_sock+0x39/0x55
Oct 22 00:17:56 db1 kernel:  [<022751b8>] release_sock+0x1f/0x4f
Oct 22 00:17:56 db1 kernel:  [<02277e42>] sk_stream_wait_memory+0x113/0x1a8
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:56 db1 kernel:  [<02297ca1>] tcp_sendmsg+0xb5c/0xe4d
Oct 22 00:17:57 db1 kernel:  [<022b2f5d>] inet_sendmsg+0x38/0x42
Oct 22 00:17:57 db1 kernel:  [<0227221f>] sock_sendmsg+0xdb/0xf7
Oct 22 00:17:57 db1 kernel:  [<02286b85>] qdisc_restart+0x12/0x1b9
Oct 22 00:17:57 db1 kernel:  [<f88df37d>]
bond_dev_queue_xmit+0x1f3/0x1fb [bonding]
Oct 22 00:17:57 db1 kernel:  [<f88e29bb>]
bond_xmit_roundrobin+0xdb/0xe3 [bonding]
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<f89e95c8>] sock_xmit+0x11d/0x217 [gnbd]
Oct 22 00:17:57 db1 kernel:  [<022929c0>] ip_finish_output2+0x0/0x18d
Oct 22 00:17:57 db1 kernel:  [<022927e7>] dst_output+0xf/0x1a
Oct 22 00:17:57 db1 kernel:  [<022825bd>] nf_hook_slow+0x83/0xbc
Oct 22 00:17:57 db1 kernel:  [<02141db2>] mempool_alloc+0x7b/0x135
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<f89e9938>] __gnbd_send_req+0x276/0x2e7 [gnbd]
Oct 22 00:17:57 db1 kernel:  [<f89e9dc0>] do_gnbd_request+0xfa/0x143 [gnbd]
Oct 22 00:17:57 db1 kernel:  [<02220380>] __generic_unplug_device+0x2b/0x2d
Oct 22 00:17:57 db1 kernel:  [<02220397>] generic_unplug_device+0x15/0x21
Oct 22 00:17:57 db1 kernel:  [<02220992>] get_request_wait+0x51/0xb9
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<022213c1>] __make_request+0x2bf/0x46c
Oct 22 00:17:57 db1 kernel:  [<022216fc>] generic_make_request+0x18e/0x19e
Oct 22 00:17:57 db1 kernel:  [<f88f623c>] multipath_map+0x64/0x7f [dm_multipath]
Oct 22 00:17:57 db1 kernel:  [<f88693ca>] __map_bio+0x35/0xb0 [dm_mod]
Oct 22 00:17:57 db1 kernel:  [<f88695cd>] __clone_and_map+0xc2/0x2f0 [dm_mod]
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<f88698a2>] __split_bio+0xa7/0x103 [dm_mod]
Oct 22 00:17:57 db1 kernel:  [<f8869a19>] dm_request+0x11b/0x130 [dm_mod]
Oct 22 00:17:57 db1 kernel:  [<022216fc>] generic_make_request+0x18e/0x19e
Oct 22 00:17:57 db1 kernel:  [<0215e848>] bio_clone+0x84/0x9c
Oct 22 00:17:57 db1 kernel:  [<f88693ca>] __map_bio+0x35/0xb0 [dm_mod]
Oct 22 00:17:57 db1 kernel:  [<f88695cd>] __clone_and_map+0xc2/0x2f0 [dm_mod]
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<f88698a2>] __split_bio+0xa7/0x103 [dm_mod]
Oct 22 00:17:57 db1 kernel:  [<f8869a19>] dm_request+0x11b/0x130 [dm_mod]
Oct 22 00:17:57 db1 kernel:  [<022216fc>] generic_make_request+0x18e/0x19e
Oct 22 00:17:57 db1 kernel:  [<0215e848>] bio_clone+0x84/0x9c
Oct 22 00:17:57 db1 kernel:  [<f8f2c3c1>] diaper_make_request+0x8b/0x91 [gfs]
Oct 22 00:17:57 db1 kernel:  [<022216fc>] generic_make_request+0x18e/0x19e
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<022217d6>] submit_bio+0xca/0xd2
Oct 22 00:17:57 db1 kernel:  [<0215e681>] bio_alloc+0x100/0x168
Oct 22 00:17:57 db1 kernel:  [<0215e038>] submit_bh+0x141/0x166
Oct 22 00:17:57 db1 kernel:  [<0215e0b9>] ll_rw_block+0x5c/0x72
Oct 22 00:17:57 db1 kernel:  [<f8f2d658>] gfs_dreread+0x65/0xd6 [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f2d5a4>] gfs_dread+0x20/0x36 [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f2e4ec>] gfs_get_meta_buffer+0xb1/0x250 [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f2a647>] gfs_block_map+0x242/0x3de [gfs]
Oct 22 00:17:57 db1 kernel:  [<022cad75>] __cond_resched+0x14/0x39
Oct 22 00:17:57 db1 kernel:  [<f8f49cd6>] get_block+0x2a/0x6d [gfs]
Oct 22 00:17:57 db1 kernel:  [<0215cd70>] __block_prepare_write+0x165/0x3ec
Oct 22 00:17:57 db1 kernel:  [<0215d682>] block_prepare_write+0x16/0x23
Oct 22 00:17:57 db1 kernel:  [<f8f49cac>] get_block+0x0/0x6d [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f4a258>] gfs_prepare_write+0x122/0x135 [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f49cac>] get_block+0x0/0x6d [gfs]
Oct 22 00:17:57 db1 kernel:  [<02140ec8>]
generic_file_buffered_write+0x218/0x533
Oct 22 00:17:57 db1 kernel:  [<02126347>] current_fs_time+0x44/0x4c
Oct 22 00:17:57 db1 kernel:  [<0214156c>]
__generic_file_aio_write_nolock+0x389/0x3b7
Oct 22 00:17:57 db1 kernel:  [<021415d3>]
generic_file_aio_write_nolock+0x39/0x7f
Oct 22 00:17:57 db1 kernel:  [<02141736>] generic_file_write_nolock+0x84/0x99
Oct 22 00:17:57 db1 kernel:  [<f8f38055>] gfs_glock_nq+0xe3/0x116 [gfs]
Oct 22 00:17:57 db1 kernel:  [<021204e9>] autoremove_wake_function+0x0/0x2d
Oct 22 00:17:57 db1 kernel:  [<f8f58bac>] gfs_trans_begin_i+0xfd/0x15a [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f4c0fc>] do_do_write_buf+0x2a6/0x452 [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f4c3c3>] do_write_buf+0x11b/0x15e [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f4b31c>] walk_vm+0xd7/0x100 [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f4c4a7>] __gfs_write+0xa1/0xbb [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f4c2a8>] do_write_buf+0x0/0x15e [gfs]
Oct 22 00:17:57 db1 kernel:  [<f8f4c4cc>] gfs_write+0xb/0xe [gfs]
Oct 22 00:17:57 db1 kernel:  [<0215a52f>] vfs_write+0xb6/0xe2
Oct 22 00:17:57 db1 kernel:  [<0215a5f9>] sys_write+0x3c/0x62
Oct 22 00:17:57 db1 kernel:  =======================
Oct 22 00:17:57 db1 kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000001
Oct 22 00:17:57 db1 kernel:  printing eip:
Oct 22 00:17:57 db1 kernel: 02105fc0
Oct 22 00:17:57 db1 kernel: *pde = 00004001


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