Re: [Xen-devel] Unable to handle kernel paging request at virtual address e9042464

[Bin Ren <bin.ren@xxxxxxxxx>]

I've fixed this bug in the unstable repository. It's caused by two
improperly set memory-related parameters and an lack of initialization
of machine-to-phys mapping for newly allocated pages for the created
domains.

- Bin

On 4/25/05, Andrew Theurer <habanero@xxxxxxxxxx> wrote:
> On Monday 25 April 2005 16:54, Keir Fraser wrote:
> > On 25 Apr 2005, at 21:03, Jacob Gorm Hansen wrote:
> > > Do you know how the interface has changed, i.e. what I need to
> > > modify in vmtools (xend is not an option since I am running with my
> > > own userspace relinked above 0xf0000000 in dom0) to get this
> > > working again?
> >
> > I don't think this was the problem actually, but anyway: createdomain
> > no longer takes memsize nor initial mem size. To pin to a cpu you now
> > use DOM0_PINCPU. To set max mem reservation you use DOM0_SETMAXMEM.
> > To actually reserve memory you use
> > do_dom_mem_op(MEMOP_increase_reservation).
> 
> FWIW, I think I am hitting an BUG on that very changeset (1.1367) by
> trying to start a smp domU.  I have narrowed it down the 1.1367, and I
> am going to remove that diff from very latest bk pull an see what
> happens.
> 
> -Andrew
> 
> BUG output:
> 
> Starting domain dom1
> ------------[ cut here ]------------
> 
> kernel BUG at <bad filename>:46733!
> invalid operand: 0000 [#1]
> PREEMPT
> Modules linked in: ipt_MASQUERADE iptable_nat ip_conntrack ip_tables
> qla2300 qla2xxx scsi_transport_fc mptscsih mptbase
> CPU:    0
> EIP:    0061:[<c014c6e8>]    Not tainted VLI
> EFLAGS: 00010286   (2.6.11-xen0-up)
> EIP is at page_remove_rmap+0x3d/0x47
> eax: ffffffff   ebx: 00000000   ecx: c04f771c   edx: c16fdfe0
> esi: f48d5494   edi: 0feff067   ebp: 00001000   esp: f459de48
> ds: 007b   es: 007b   ss: 0069
> Process python (pid: 4300, threadinfo=f459c000 task=f76c3a80)
> Stack: c1641640 f459c000 c0145244 c16fdfe0 0a3d5067 c01471fe 00000010
> c16fdfe0
>        00000000 b7525000 c04f771c b7925000 f455fb78 b7526000 00000000
> c0145408
>        c04f771c f455fb74 b7525000 00001000 00000000 b7525000 f455fb78
> b7526000
> Call Trace:
>  [<c0145244>] zap_pte_range+0x186/0x2f3
>  [<c01471fe>] do_anonymous_page+0x169/0x210
>  [<c0145408>] zap_pmd_range+0x57/0x75
>  [<c0145460>] zap_pud_range+0x3a/0x5e
>  [<c01454f8>] unmap_page_range+0x74/0x8b
>  [<c014560c>] unmap_vmas+0xfd/0x223
>  [<c0149ff4>] unmap_region+0x7b/0xe9
>  [<c014a2c8>] do_munmap+0x122/0x191
>  [<c014a37e>] sys_munmap+0x47/0x62
>  [<c010965c>] syscall_call+0x7/0xb
> Code: 0f 98 c0 84 c0 74 1c 8b 42 08 83 c0 01 78 1c c7 44 24 04 ff ff ff
> ff c7 04 24 10 00 00 00 e8 a3 ef fe ff 83 c4 08 c3 0f 0b eb d1 <0f> 0b
> 8d b6 00 00 00 00 eb da 55 57 56 53 83 ec 1c 8b 4c 24 34
>  <6>note: python[4300] exited with preempt_count 1
> scheduling while atomic: python/0x00000001/4300
>  [<c03ae564>] schedule+0x534/0x5d8
>  [<c010980b>] hypervisor_callback+0x37/0x40
>  [<c03af64d>] rwsem_down_read_failed+0x8d/0x18b
>  [<c011da4b>] .text.lock.exit+0x27/0x8c
>  [<c010a33f>] do_invalid_op+0x0/0xab
>  [<c011c212>] do_exit+0x9d/0x36b
>  [<c010a33f>] do_invalid_op+0x0/0xab
>  [<c010a02d>] do_trap+0x0/0xd5
>  [<c010a3e1>] do_invalid_op+0xa2/0xab
>  [<c014c6e8>] page_remove_rmap+0x3d/0x47
>  [<c013aa7e>] rmqueue_bulk+0x4a/0xd5
>  [<c013a94a>] prep_new_page+0x72/0x77
>  [<c013adfe>] buffered_rmqueue+0x153/0x2ba
>  [<c01097cc>] error_code+0x38/0x40
>  [<c014c6e8>] page_remove_rmap+0x3d/0x47
>  [<c0145244>] zap_pte_range+0x186/0x2f3
>  [<c01471fe>] do_anonymous_page+0x169/0x210
>  [<c0145408>] zap_pmd_range+0x57/0x75
>  [<c0145460>] zap_pud_range+0x3a/0x5e
>  [<c01454f8>] unmap_page_range+0x74/0x8b
>  [<c014560c>] unmap_vmas+0xfd/0x223
>  [<c0149ff4>] unmap_region+0x7b/0xe9
>  [<c014a2c8>] do_munmap+0x122/0x191
>  [<c014a37e>] sys_munmap+0x47/0x62
>  [<c010965c>] syscall_call+0x7/0xb
> 
> 
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