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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sat, Mar 07, 2009 at 10:09:16PM -0800, Jeremy Fitzhardinge wrote:
> 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?
> 

At that time I was compiling a kernel on dom0.. so dom0 was busy.

No other domains running. 

-- Pasi

>    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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