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Bug#686847: marked as done (KVM guest slows down and finally hangs on I/O)

Your message dated Sun, 07 Feb 2016 22:43:09 +0000
with message-id <E1aSY2v-0006KG-RP@deadeye>
and subject line Closing bugs assigned to linux-2.6 package
has caused the Debian Bug report #686847,
regarding KVM guest slows down and finally hangs on I/O
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.)


-- 
686847: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=686847
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-2.6
Version: 2.6.32-45
Severity: normal

Linux vmXXXX.cs16.seeweb.it 2.6.32-5-amd64 #1 SMP Sun May 6 04:00:17 UTC 2012 x86_64 GNU/Linux

This is a fully up to date squeeze system running as a guest on a RHEL 
6.2 host. 1 CPU, 1 GB of RAM, virtio net and disk (using XFS).
We have hundreds of similar guests but only this one shows this problem.

The system suddenly slows down and then all processes hang. The getty on 
the virtual console is responsive to input, but it hangs when it tries 
to fork+exec login.

The workload is unmemorable, apparently mostly light apache/PHP.

The kernel logs this same stack trace for all (?) processes:

INFO: task apache2:12623 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
apache2       D 0000000000000000     0 12623  12619 0x00000000
 ffffffff814611f0 0000000000000086 0000000000000292 ffffffff8118ac27
 ffff88002faf8000 000000108102cdc4 000000000000f9e0 ffff880003113fd8
 0000000000015780 0000000000015780 ffff88002faf8000 ffff88002faf82f8
Call Trace:
 [<ffffffff8118ac27>] ? cfq_set_request+0x2af/0x319
 [<ffffffff8102cdc4>] ? pvclock_clocksource_read+0x3a/0x8b
 [<ffffffff812fb3fa>] ? io_schedule+0x73/0xb7
 [<ffffffff8117f6e9>] ? get_request_wait+0xf0/0x188
 [<ffffffff81064f92>] ? autoremove_wake_function+0x0/0x2e
 [<ffffffff8117fa78>] ? __make_request+0x2f7/0x428
 [<ffffffff81191f63>] ? radix_tree_tag_clear+0x93/0xf1
 [<ffffffff8117e247>] ? generic_make_request+0x299/0x2f9
 [<ffffffff81192109>] ? radix_tree_tag_set+0x65/0xc6
 [<ffffffff8117e37d>] ? submit_bio+0xd6/0xf2
 [<ffffffff810ba9a9>] ? test_set_page_writeback+0xe0/0xef
 [<ffffffff810d8be8>] ? swap_writepage+0x9b/0xa5
 [<ffffffff810be529>] ? shrink_page_list+0x375/0x623
 [<ffffffff810bea8b>] ? shrink_active_list+0x2b4/0x2d9
 [<ffffffff810bef0c>] ? shrink_list+0x45c/0x767
 [<ffffffff812fb320>] ? thread_return+0x79/0xe0
 [<ffffffff810bf497>] ? shrink_zone+0x280/0x342
 [<ffffffff812fb4ab>] ? _cond_resched+0x24/0x2f
 [<ffffffff810bf69a>] ? shrink_slab+0x141/0x153
 [<ffffffff810c055e>] ? try_to_free_pages+0x232/0x38e
 [<ffffffff810bd553>] ? isolate_pages_global+0x0/0x20f
 [<ffffffff810ba5ec>] ? __alloc_pages_nodemask+0x3d4/0x5fc
 [<ffffffff810d8e00>] ? read_swap_cache_async+0x5d/0xf3
 [<ffffffff810d8eed>] ? swapin_readahead+0x57/0x98
 [<ffffffff810ccdfd>] ? handle_mm_fault+0x47f/0x80f
 [<ffffffff812feb96>] ? do_page_fault+0x2e0/0x2fc
 [<ffffffff812fca35>] ? page_fault+0x25/0x30

-- 
ciao,
Marco

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

Debian 6.0 Long Term Support has now ended, and the 'linux-2.6' source
package will no longer be updated.  This bug is being closed 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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