Re: [Xen-devel] kernel BUG at arch/x86/xen/mmu.c:1860!

[benco <benco@xxxxxxx>]

Hello,

I can confirm this bug, I'm using very similar configuration - Debian
Lenny/Squeeze on several servers connected to FC storage with enabled
multipathing.

One more thing - it was quite long ago, but I did not see this bug with Xen
4.0 pre-release versions with 2.6.31 kernel from Jeremy's tree. I'm
regularly updating my system to up-to-date version of Xen/PV-OPS kernel and 
this bug is here across whole development line from Xen 4.0/2.6.32 kernel 
until now:(

Roman

On Wed, Mar 09, 2011 at 01:06:39AM +0100, Andreas Olsowski wrote:
> Well, this is too bad.
> 
> I encountered this bug when xen 4.0 was released, around the time 
> development on 2.6.31 was halted.
> 
> That is why i stuck with 2.6.31 when everyone else went with 2.6.32,
> because i determined 2.6.32 was not fit for duty and im guessing it 
> still isnt today.
> 
> The bug occures on 2.6.32 xen kernels ( maybe even newer ones) and is 
> distribution unrelated, i was running debian 5.0 then, i am running 6.0 
> testing now and even have tried compiling all the userland stuff myself.
> 
> This is error can be encountered during a number of different actions:
> 1.) any action with lvm (start, stop, create, delete)
> 2.) while starting multipathd (restarting too, of course)
> 
> Sometimes the box only hangs there and no further device mapper 
> interactions are possible. This is where i got my syslog entry from.
> 
> Back in 2010 i had to serial console the server and stuff like that to 
> see the whole error.
> 
> 
> my guess is everything one does with the device mapper can and will 
> trigger this sooner or later.
> 
> Does anybody have any kind of insight on what the problem may be?
> 
> ------------
> Here is my syslog part when i ran "/etc/init.d/multipath-tools restart":
> 
> Mar  9 00:24:10 memoryana multipathd: mpatha: stop event checker thread 
> (140606587918080)
> Mar  9 00:24:10 memoryana multipathd: mpathb: stop event checker thread 
> (140606587885312)
> Mar  9 00:24:10 memoryana multipathd: mpathc: stop event checker thread 
> (140606587852544)
> Mar  9 00:24:10 memoryana kernel: ------------[ cut here ]------------
> Mar  9 00:24:10 memoryana kernel: kernel BUG at arch/x86/xen/mmu.c:1872!
> Mar  9 00:24:10 memoryana kernel: invalid opcode: 0000 [#1] SMP
> Mar  9 00:24:10 memoryana kernel: last sysfs file: 
> /sys/devices/pci0000:00/0000:00:07.0/0000:04:00.1/host3/rport-3:0-2/target3:0:2/3:0:2:0/state
> Mar  9 00:24:10 memoryana kernel: CPU 1
> Mar  9 00:24:10 memoryana kernel: Modules linked in: dm_round_robin 
> dm_multipath qla2xxx
> Mar  9 00:24:10 memoryana kernel: Pid: 10662, comm: multipath-tools Not 
> tainted 2.6.32.28-xen0 #4 PowerEdge R610
> Mar  9 00:24:10 memoryana kernel: RIP: e030:[<ffffffff8100d471>] 
> [<ffffffff8100d471>] pin_pagetable_pfn+0x31/0x60
> Mar  9 00:24:10 memoryana kernel: RSP: e02b:ffff8800c3101df8  EFLAGS: 
> 00010282
> Mar  9 00:24:10 memoryana kernel: RAX: 00000000ffffffea RBX: 
> ffff8800cc4c3400 RCX: 0000000000000003
> Mar  9 00:24:10 memoryana kernel: RDX: 0000000000000000 RSI: 
> 0000000000000001 RDI: ffff8800c3101df8
> Mar  9 00:24:10 memoryana kernel: RBP: ffff8800c3135b60 R08: 
> 00003ffffffff000 R09: ffff880000000000
> Mar  9 00:24:10 memoryana kernel: R10: 0000000000007ff0 R11: 
> 0000000000000246 R12: 00000000000cc302
> Mar  9 00:24:10 memoryana kernel: R13: 0000000000000000 R14: 
> ffff8800c374cc60 R15: ffff8800c374cc60
> Mar  9 00:24:10 memoryana kernel: FS:  00007f60add15700(0000) 
> GS:ffff880028055000(0000) knlGS:0000000000000000
> Mar  9 00:24:10 memoryana kernel: CS:  e033 DS: 0000 ES: 0000 CR0: 
> 000000008005003b
> Mar  9 00:24:10 memoryana kernel: CR2: 00007f60ad841876 CR3: 
> 00000000cef79000 CR4: 0000000000002660
> Mar  9 00:24:10 memoryana kernel: DR0: 0000000000000000 DR1: 
> 0000000000000000 DR2: 0000000000000000
> Mar  9 00:24:10 memoryana kernel: DR3: 0000000000000000 DR6: 
> 00000000ffff0ff0 DR7: 0000000000000400
> Mar  9 00:24:10 memoryana kernel: Process multipath-tools (pid: 10662, 
> threadinfo ffff8800c3100000, task ffff8800cc01cbc0)
> Mar  9 00:24:10 memoryana kernel: Stack:
> Mar  9 00:24:10 memoryana kernel: 0000000000000000 00000000008e8302 
> ffff8800cc4c3400 ffff8800c3135b60
> Mar  9 00:24:10 memoryana kernel: <0> 00000000000cc302 ffffffff810b0382 
> 00007f60ad841876 ffff8800c30b4c10
> Mar  9 00:24:10 memoryana kernel: <0> 00000000000100e0 0000000000000000 
> ffff8800c374cc60 ffffffff810b3595
> Mar  9 00:24:10 memoryana kernel: Call Trace:
> Mar  9 00:24:10 memoryana kernel: [<ffffffff810b0382>] ? 
> __pte_alloc+0xf2/0x120
> Mar  9 00:24:10 memoryana kernel: [<ffffffff810b3595>] ? 
> handle_mm_fault+0xa45/0xab0
> Mar  9 00:24:10 memoryana kernel: [<ffffffff8153cfe5>] ? 
> page_fault+0x25/0x30
> Mar  9 00:24:10 memoryana kernel: [<ffffffff8153d21a>] ? 
> error_exit+0x2a/0x60
> Mar  9 00:24:10 memoryana kernel: [<ffffffff8101481d>] ? 
> retint_restore_args+0x5/0x6
> Mar  9 00:24:10 memoryana kernel: [<ffffffff81038631>] ? 
> do_page_fault+0x121/0x3c0
> Mar  9 00:24:10 memoryana kernel: [<ffffffff812a2e0d>] ? 
> __put_user_4+0x1d/0x30
> Mar  9 00:24:10 memoryana kernel: [<ffffffff8153cfe5>] ? 
> page_fault+0x25/0x30
> Mar  9 00:24:10 memoryana kernel: Code: 57 c7 75 00 00 48 89 f0 89 3c 24 
> 74 27 48 89 44 24 08 48 89 e7 be 01 00 00 00 31 d2 41 ba f0 7f 00 00 e8 
> d3 be ff ff 85 c0 74 04 <0f> 0b eb fe 48 83 c4 28 c3 48 89 f7 e8 6e f7 
> ff ff 48 83 f8 ff
> Mar  9 00:24:10 memoryana kernel: RIP  [<ffffffff8100d471>] 
> pin_pagetable_pfn+0x31/0x60
> Mar  9 00:24:10 memoryana kernel: RSP <ffff8800c3101df8>
> Mar  9 00:24:10 memoryana kernel: ---[ end trace f4eae184c1a9f532 ]---
> Mar  9 00:24:11 memoryana multipathd: --------shut down-------
> 
> -- 
> Andreas Olsowski
> Leuphana UniversitÃt LÃneburg
> Rechen- und Medienzentrum
> ScharnhorststraÃe 1, C7.015
> 21335 LÃneburg
> 
> Tel: ++49 4131 677 1309
> 
> 



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