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xen-devel
Re: [Xen-devel] I/O related (?) domU crash on xen 4.0 + pv_ops
On 06/08/2010 01:16 PM, Rick Boone wrote:
> Hey,
>
> I'm running into an issue with pv_ops kernel (2.6.31.13) and xen 4.0 -
> my domU's are continually locking up, under heavy IO load. My issue
> seems similar to what these guys are reportiing:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=551552
> https://bugzilla.redhat.com/show_bug.cgi?id=526627
> https://bugzilla.redhat.com/show_bug.cgi?id=550724
>
> Any solutions/ideas that haven't been covered in those reports? I've
> turned off tickless kernel, and have also set the guest I/O scheduler
> to "noop", but machines are still crashing. I'm using LVM-backed block
> devices on the dom0. For awhile, I didn't have the kernel set to panic
> on a hung task, and from digging around while the kernel was still up,
> I was able to determine that the device that seems to be causing
> issues is one that sees a lot of IO (it's receiving all of the logs on
> a heavily used web server).
Does booting the domU with "clocksource=jiffies" help at all?
Have you tried a 2.6.32-based domU? I used to see these kinds of
lockups with older kernels on my linode domU, but have seen none since
moving it to Fedora 12 with a 2.6.32 kernel.
Are you using a distro kernel, or one you've built yourself?
J
>
> Here's a couple of my tracebacks:
> 1)
>
> INFO: task pdflush:36 blocked for more than 120 seconds.
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> ffff8801e963f9c0 0000000000000282 00000000e4f10f56 ffff8801e963f9d0
> ffff8801eb7a31b0 ffff8801eb67c240 ffff8801eb7a3590 0000000103902b94
> 00000000e4f10f56 ffff8801e963fa70 ffff8801e963f9b0 ffffffff811f14ec
> Call Trace:
> [<ffffffff811f14ec>] ? blk_unplug+0x56/0x72
> [<ffffffff813f1ee0>] io_schedule+0x37/0x59
> [<ffffffff8112b1a8>] ? block_sync_page+0x5b/0x71
> [<ffffffff810c2e77>] sync_page+0x5a/0x72
> [<ffffffff813f2237>] __wait_on_bit_lock+0x55/0xb3
> [<ffffffff810c2e1d>] ? sync_page+0x0/0x72
> [<ffffffff810c2b0d>] ? find_get_pages_tag+0xf7/0x144
> [<ffffffff810c2dce>] __lock_page+0x71/0x8c
> [<ffffffff8107569f>] ? wake_bit_function+0x0/0x51
> [<ffffffff810cafe4>] write_cache_pages+0x201/0x3bf
> [<ffffffff810cac23>] ? __writepage+0x0/0x5a
> [<ffffffff8100ef6c>] ? xen_force_evtchn_callback+0x20/0x36
> [<ffffffff8100fa6f>] ? xen_restore_fl_direct_end+0x0/0x1
> [<ffffffff810cb1d7>] generic_writepages+0x35/0x4f
> [<ffffffff810cb230>] do_writepages+0x3f/0x5e
> [<ffffffff811261e5>] writeback_single_inode+0x161/0x2d7
> [<ffffffff811267ab>] generic_sync_sb_inodes+0x1ef/0x355
> [<ffffffff810cc726>] ? pdflush+0x0/0x286
> [<ffffffff8112692d>] sync_sb_inodes+0x1c/0x32
> [<ffffffff811269bc>] writeback_inodes+0x79/0xdf
> [<ffffffff81107819>] ? sync_supers+0xb3/0xce
> [<ffffffff810cc1f6>] wb_kupdate+0xb9/0x13a
> [<ffffffff810cc84c>] ? pdflush+0x126/0x286
> [<ffffffff810cc889>] pdflush+0x163/0x286
> [<ffffffff810cc13d>] ? wb_kupdate+0x0/0x13a
> [<ffffffff810cc726>] ? pdflush+0x0/0x286
> [<ffffffff810754ce>] kthread+0x9e/0xa8
> [<ffffffff8101606a>] child_rip+0xa/0x20
> [<ffffffff810151ac>] ? int_ret_from_sys_call+0x7/0x1b
> [<ffffffff810159e6>] ? retint_restore_args+0x5/0x6
> [<ffffffff81016060>] ? child_rip+0x0/0x20
> 1 lock held by pdflush/36:
> #0: (&type->s_umount_key#23){......}, at: [<ffffffff811269a6>]
> writeback_inodes+0x63/0xdf
> Kernel panic - not syncing: hung_task: blocked tasks
> Pid: 34, comm: khungtaskd Not tainted 2.6.31.13-xen-4.0.0 #4
> Call Trace:
> [<ffffffff8105c8f3>] panic+0xb2/0x168
> [<ffffffff81085881>] ? print_lock+0x96/0xb1
> [<ffffffff810861d5>] ? lockdep_print_held_locks+0xa5/0xc9
> [<ffffffff8101907a>] ? show_stack+0x2a/0x40
> [<ffffffff8102f025>] ? touch_nmi_watchdog+0x6c/0x87
> [<ffffffff810862c7>] ? __debug_show_held_locks+0x33/0x49
> [<ffffffff810b146c>] watchdog+0x209/0x258
> [<ffffffff810b12d8>] ? watchdog+0x75/0x258
> [<ffffffff8104a45f>] ? complete+0x52/0x71
> [<ffffffff810b1263>] ? watchdog+0x0/0x258
> [<ffffffff810754ce>] kthread+0x9e/0xa8
> [<ffffffff8101606a>] child_rip+0xa/0x20
> [<ffffffff810151ac>] ? int_ret_from_sys_call+0x7/0x1b
> [<ffffffff810159e6>] ? retint_restore_args+0x5/0x6
> [<ffffffff81016060>] ? child_rip+0x0/0x20
>
> ---------------------------------------------
>
> 2)
> INFO: task kjournald:951 blocked for more than 120 seconds.
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> ffff8801c8993bf0 0000000000000282 00000000cf63a654 ffff8801c8993c00
> ffff8801ca899090 ffff8801ccae31b0 ffff8801ca899470 0000000000000001
> 0000000000000001 0000000000000200 0000000000000001 000000000160015f
> Call Trace:
> [<ffffffff813f1ee0>] io_schedule+0x37/0x59
> [<ffffffff811f1528>] ? blk_backing_dev_unplug+0x20/0x36
> [<ffffffff8112cb73>] sync_buffer+0x51/0x69
> [<ffffffff813f2387>] __wait_on_bit+0x54/0x9c
> [<ffffffff8112cb22>] ? sync_buffer+0x0/0x69
> [<ffffffff8112cb22>] ? sync_buffer+0x0/0x69
> [<ffffffff813f244c>] out_of_line_wait_on_bit+0x7d/0x9e
> [<ffffffff8107569f>] ? wake_bit_function+0x0/0x51
> [<ffffffff8112ca8f>] __wait_on_buffer+0x32/0x48
> [<ffffffffa005cf62>] journal_commit_transaction+0x684/0x12f2 [jbd]
> [<ffffffff8100fa82>] ? check_events+0x12/0x20
> [<ffffffff8100fa6f>] ? xen_restore_fl_direct_end+0x0/0x1
> [<ffffffff813f4ad7>] ? _spin_unlock_irqrestore+0x44/0x5f
> [<ffffffff81067de4>] ? try_to_del_timer_sync+0x65/0x84
> [<ffffffff81067e03>] ? del_timer_sync+0x0/0xa0
> [<ffffffffa0061dd4>] kjournald+0x161/0x3ae [jbd]
> [<ffffffff81075641>] ? autoremove_wake_function+0x0/0x5e
> [<ffffffffa0061c73>] ? kjournald+0x0/0x3ae [jbd]
> [<ffffffff810754ce>] kthread+0x9e/0xa8
> [<ffffffff8101606a>] child_rip+0xa/0x20
> [<ffffffff810151ac>] ? int_ret_from_sys_call+0x7/0x1b
> [<ffffffff810159e6>] ? retint_restore_args+0x5/0x6
> [<ffffffff81016060>] ? child_rip+0x0/0x20
> no locks held by kjournald/951.
> Kernel panic - not syncing: hung_task: blocked tasks
> Pid: 34, comm: khungtaskd Not tainted 2.6.31.13-xen-4.0.0 #18
> Call Trace:
> [<ffffffff8105c8f3>] panic+0xb2/0x168
> [<ffffffff81086176>] ? lockdep_print_held_locks+0x46/0xc9
> [<ffffffff8101907a>] ? show_stack+0x2a/0x40
> [<ffffffff8102f025>] ? touch_nmi_watchdog+0x6c/0x87
> [<ffffffff810862c7>] ? __debug_show_held_locks+0x33/0x49
> [<ffffffff810b146c>] watchdog+0x209/0x258
> [<ffffffff810b12d8>] ? watchdog+0x75/0x258
> [<ffffffff8104a45f>] ? complete+0x52/0x71
> [<ffffffff810b1263>] ? watchdog+0x0/0x258
> [<ffffffff810754ce>] kthread+0x9e/0xa8
> [<ffffffff8101606a>] child_rip+0xa/0x20
> [<ffffffff810151ac>] ? int_ret_from_sys_call+0x7/0x1b
> [<ffffffff810159e6>] ? retint_restore_args+0x5/0x6
> [<ffffffff81016060>] ? child_rip+0x0/0x20
>
> -- Rick Boone
>
>
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> http://lists.xensource.com/xen-devel
>
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