Re: [Xen-devel] 2.6.29-rc7 pv_ops dom0 BUG / unable to handle kernel paging request

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Pasi Kärkkäinen wrote:
> Hello!
>
> Latest git tree (updated some hours ago) boots up fine for me, xend can be started etc, 
> but some time after starting kernel compilation I get the following BUG:
> http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-19-xen331-linux-2.6.29-rc7-bug.txt
>
> (XEN) mm.c:2006:d0 Bad type (saw 28000001 != exp e0000000) for mfn 436a3 (pfn 
> 3d0a3)
> (XEN) mm.c:707:d0 Error getting mfn 436a3 (pfn 3d0a3) from L1 entry 
> 00000000436a3063 for dom0
> (XEN) mm.c:3640:d0 ptwr_emulate: could not get_page_from_l1e()
> BUG: unable to handle kernel paging request at c01cbd58
> IP: [<c0405d2f>] xen_set_pte+0x8c/0x96
>   
Well, that's bad news.  It was trying to map a highmem pte page which 
didn't have the Pinned bit set on its page, but Xen thought it was a 
pinned pte page.  Not sure how it could get into that state, but its 
indicative of general memory corruption.
What was going on at the time?  Was dom0 busy?  Were you running some domUs?

   J

> *pdpt = 000000003d1f0001 
> Oops: 0003 [#1] SMP 
> last sysfs file: /sys/devices/pci0000:00/0000:00:1e.0/0000:06:01.0/class
> Modules linked in: ipt_MASQUERADE iptable_nat nf_nat bridge stp bnep sco
> l2cap bluetooth sunrpc ipv6 dm_multipath uinput
>  ppdev floppy i2c_i801 pcspkr iTCO_wdt i2c_core iTCO_vendor_support
> pata_pdc2027x sata_promise parport_pc parport tg3 li
> bphy ata_generic pata_acpi [last unloaded: microcode]
>
> Pid: 325, comm: kswapd0 Not tainted (2.6.29-rc7-tip #10) P8SC8
> EIP: 0061:[<c0405d2f>] EFLAGS: 00010206 CPU: 0
> EIP is at xen_set_pte+0x8c/0x96
> EAX: c01cbd58 EBX: 000e133a ECX: 00000000 EDX: 00000000
> ESI: 436a3063 EDI: 0003d0a3 EBP: e2152d8c ESP: e2152d78
>  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
> Process kswapd0 (pid: 325, ti=e2152000 task=e219a610 task.ti=e2152000)
> Stack:
>  00000000 c01cbd58 3d0a3063 c01cbd58 0003d0a3 e2152db4 c0427ff5 00000000
>  80000000 00000163 f57ff000 0000000f c19d3460 0000000f c1232000 e2152dcc
>  c0404d91 00000163 80000000 436a3067 0a078000 e2152df4 c0489c17 00000000
> Call Trace:
>  [<c0427ff5>] ? kmap_atomic_prot+0x1cd/0x1ef
>  [<c0404d91>] ? xen_kmap_atomic_pte+0x2f/0x36
>  [<c0489c17>] ? page_check_address+0x7f/0x131
>  [<c0489d71>] ? page_referenced_one+0x4b/0xe9
>  [<c048aa4b>] ? page_referenced+0x7d/0xee
>  [<c047b3f0>] ? shrink_active_list+0x10b/0x29c
>  [<c0422bfe>] ? pvclock_clocksource_read+0x48/0xa3
>  [<c0407410>] ? __xen_spin_lock+0xc4/0xd8
>  [<c047c27b>] ? shrink_zone+0x285/0x29a
>  [<c047c77a>] ? kswapd+0x3b6/0x53d
>  [<c047aa07>] ? isolate_pages_global+0x0/0x19e
>  [<c04480cf>] ? autoremove_wake_function+0x0/0x33
>  [<c047c3c4>] ? kswapd+0x0/0x53d
>  [<c0447e03>] ? kthread+0x3b/0x61
>  [<c0447dc8>] ? kthread+0x0/0x61
>  [<c04097c7>] ? kernel_thread_helper+0x7/0x10
> Code: f3 ab c6 05 9c 33 8d c0 00 8b 1d fc 32 8d c0 e8 2d cb 01 00 8b 55 ec
> 48 0f 94 c0 0f b6 c0 01 d8 a3 fc 32 8d c0 8b 
> 45 f0 89 50 04 <89> 30 8d 65 f4 5b 5e 5f 5d c3 55 89 e5 57 56 89 c6 53 89 d3
> 83 
> EIP: [<c0405d2f>] xen_set_pte+0x8c/0x96 SS:ESP 0069:e2152d78
> CR2: 00000000c01cbd58
> ---[ end trace b993ac68a500f37e ]---
> ..
> .. 
>
> .. and a lot of other stuff after this.
>
> -- Pasi
>
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>   

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