[Xen-bugs] Xen debian domU segfault trouble

[Каражас Эльдар <admin@xxxxxxxxxx>]

Good afternoon!

I am running xen-3.0.3-120.el5_6.1 at CentOS 5.6 with kernel
2.6.18-194.el5xen at dom0. Hardware is Hetzner EQ4 server, with
hyperthreading-enabled CPU and 8GBs RAM.
I am running 2 Debian 6.0 domUs on it.
And I have a lot of segfaults in random processes at random time. There is
entries in domUs kern.log like this:

Apr 24 11:50:01 static kernel: monitor.pl[27532]: segfault at
00002b95caeabbd8 rip 00002b95caea7f34 rsp 00007fffb1ff88b0 error 7
Apr 25 16:20:01 static kernel: monitor.pl[4390]: segfault at
0000000000000021 rip 00002b3c94c4841e rsp 00007fff6bd61160 error 4

And like this:
Bad page state in process 'nginx'
page:ffff88000432d9f0 flags:0x0000000000000000 mapping:0000000000000000
mapcount:0 count:524288 (Tainted: G    B)
Trying to fix it up, but a reboot is needed
Backtrace:

Call Trace:
 [<ffffffff802c01c6>] bad_page+0x69/0x91
 [<ffffffff8020b038>] get_page_from_freelist+0x236/0x3ef
 [<ffffffff8020f69b>] __alloc_pages+0x78/0x308
 [<ffffffff80249759>] sprintf+0x51/0x59
 [<ffffffff802093c5>] __handle_mm_fault+0x94c/0x1348
 [<ffffffff80264931>] _spin_lock_irqsave+0x9/0x14
 [<ffffffff8026769a>] do_page_fault+0xf7b/0x12e0
 [<ffffffff80264931>] _spin_lock_irqsave+0x9/0x14
 [<ffffffff802ea9b9>] sys_epoll_wait+0x3b8/0x3f9
 [<ffffffff80264931>] _spin_lock_irqsave+0x9/0x14
 [<ffffffff8026082b>] error_exit+0x0/0x6e

Bad page state in process 'cron.pl'
page:ffff88000432d9f0 flags:0x0000000000000000 mapping:0000000000000000
mapcount:0 count:524288 (Tainted: G    B)
Trying to fix it up, but a reboot is needed
Backtrace:

Call Trace:
 [<ffffffff802c01c6>] bad_page+0x69/0x91
 [<ffffffff8020b038>] get_page_from_freelist+0x236/0x3ef
 [<ffffffff8020f69b>] __alloc_pages+0x78/0x308
 [<ffffffff802093c5>] __handle_mm_fault+0x94c/0x1348
 [<ffffffff8021763d>] generic_file_aio_read+0x34/0x39
 [<ffffffff8020d3eb>] do_sync_read+0xc7/0x104
 [<ffffffff80264931>] _spin_lock_irqsave+0x9/0x14
 [<ffffffff8026769a>] do_page_fault+0xf7b/0x12e0
 [<ffffffff8029c60a>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8026082b>] error_exit+0x0/0x6e

I have no idea, why this errors comes. I thought, that it was connected
with hardware and I asked hetzner support to made full hardware
diagnostics. No succes - all hardware working just fine.
I tried to re-create domUs - with no success, again.
This domUs is very important for me. Can you help me, please?
Thanks a lot.

-- 
С уважением, 
Каражас Эльдар
Системный администратор, веб-разработчик.
+7 (916) 312 15 14
admin@xxxxxxxxxx

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