Re: Bug inkvm_set_irq

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Le 01/03/2011 08:03, Michael S. Tsirkin a écrit :
On Mon, Feb 28, 2011 at 11:34:16PM +0100, Jean-Philippe Menil wrote:
Hi,

here is another trace with kvm.ko compiled with debug flags.

the bug:
[12099.503414] BUG: unable to handle kernel paging request at
000000000b6635e9
[12099.503462] IP: [<ffffffffa03ee877>] kvm_set_irq+0x37/0x140 [kvm]
[12099.503521] PGD 45d8d2067 PUD 45d58e067 PMD 0
[12099.503560] Oops: 0000 [#1] SMP
[12099.503591] last sysfs file:
/sys/devices/system/cpu/cpu11/cache/index2/shared_cpu_map
[12099.503641] CPU 0
[12099.503648] Modules linked in: netconsole configfs vhost_net
macvtap macvlan tun veth powernow_k8 mperf cpufreq_userspace
cpufreq_stats cpufreq_powersave cpufreq_ondemand freq_table
cpufreq_conservative fuse xt_physdev ip6t_LOG ip6table_filter
ip6_tables ipt_LOG xt_multiport xt_limit xt_tcpudp xt_state
iptable_filter ip_tables x_tables nf_conntrack_tftp nf_conntrack_ftp
nf_conntrack_ipv4 nf_defrag_ipv4 8021q bridge stp ext2 mbcache
dm_round_robin dm_multipath nf_conntrack_ipv6 nf_conntrack
nf_defrag_ipv6 kvm_amd kvm ipv6 snd_pcm snd_timer snd soundcore
snd_page_alloc shpchp pci_hotplug tpm_tis i2c_nforce2 tpm i2c_core
pcspkr evdev psmouse joydev tpm_bios processor ghes dcdbas hed
button serio_raw thermal_sys xfs exportfs dm_mod sg sr_mod cdrom
usbhid hid usb_storage ses sd_mod enclosure megaraid_sas ohci_hcd
lpfc scsi_transport_fc bnx2 scsi_tgt scsi_mod ehci_hcd [last
unloaded: scsi_wait_scan]
[12099.504277]
[12099.504302] Pid: 1742, comm: kworker/0:2 Not tainted
2.6.37.2-dsiun-110105+ #2 Dell Inc. PowerEdge M605/0K543T
[12099.504373] RIP: 0010:[<ffffffffa03ee877>]  [<ffffffffa03ee877>]
kvm_set_irq+0x37/0x140 [kvm]
[12099.504444] RSP: 0018:ffff88045e013d00  EFLAGS: 00010246
[12099.504474] RAX: 000000000b6634c1 RBX: 0000000000000018 RCX:
0000000000000001
[12099.504508] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff880419b600c0
[12099.504541] RBP: ffff88045e013dd0 R08: ffff88045e012000 R09:
0000000000000000
[12099.504575] R10: 0000000000000000 R11: 00000000ffffffff R12:
ffff880419b600c0
[12099.504609] R13: ffff880419b600c0 R14: ffffffffa03efaa0 R15:
0000000000000001
[12099.504643] FS:  00007f3abaa05710(0000) GS:ffff88007f800000(0000)
knlGS:0000000000000000
[12099.504693] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[12099.504724] CR2: 000000000b6635e9 CR3: 000000045e2bc000 CR4:
00000000000006f0
[12099.504757] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[12099.504791] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[12099.504825] Process kworker/0:2 (pid: 1742, threadinfo
ffkvm_set_irqff88045e012000, task ffff88045ffb0d60)
[12099.504874] Stack:
[12099.504897]  00000000000119c0 00000000000119c0 00000000000119c0
ffff88045ffb0d60
[12099.504953]  ffff88045ffb1010 ffff88045e013fd8 ffff88045ffb1018
ffff88045e012010
[12099.505009]  00000000000119c0 ffff88045e013fd8 00000000000119c0
00000000000119c0
[12099.505065] Call Trace:
[12099.505099]  [<ffffffff813818ce>] ? common_interrupt+0xe/0x13
[12099.505145]  [<ffffffffa03efaa0>] ? irqfd_inject+0x0/0x50 [kvm]
[12099.505145]  [<ffffffffa03efaca>] irqfd_inject+0x2a/0x50 [kvm]
[12099.505145]  [<ffffffff8106b7bb>] process_one_work+0x11b/0x450
[12099.505145]  [<ffffffff8106bf37>] worker_thread+0x157/0x410
[12099.505145]  [<ffffffff8103a569>] ? __wake_up_common+0x59/0x90
[12099.505145]  [<ffffffff8106bde0>] ? worker_thread+0x0/0x410
[12099.505145]  [<ffffffff8106f996>] kthread+0x96/0xa0
[12099.505145]  [<ffffffff81003c64>] kernel_thread_helper+0x4/0x10
[12099.505145]  [<ffffffff8106f900>] ? kthread+0x0/0xa0
[12099.505145]  [<ffffffff81003c60>] ? kernel_thread_helper+0x0/0x10
[12099.505145] Code: 55 49 89 fd 41 54 53 89 d3 48 81 ec a8 00 00 00
8b 15 a6 75 03 00 89 b5 3c ff ff ff 85 d2 0f 85 d5 00 00 00 49 8b 85
58 24 00 00<3b>  98 28 01 00 00 73 61 89 db 48 8b 84 d8 30 01 00 00
48 85 c0
[12099.505145] RIP  [<ffffffffa03ee877>] kvm_set_irq+0x37/0x140 [kvm]
[12099.505145]  RSP<ffff88045e013d00>
[12099.505145] CR2: 000000000b6635e9


markup_oops result:

root@ayrshire:~# cat bug.txt | perl markup_oops.pl -m
/lib/modules/2.6.37.2-dsiun-110105+/kernel/arch/x86/kvm/kvm.ko
/boot/vmlinuz-2.6.37.2-dsiun-110105+
vmaoffset = 18446744072103034880 ffffffffa03ee841:	48 89 e5   	mov
%rsp,%rbp
  ffffffffa03ee844:	41 57                	push   %r15
  ffffffffa03ee846:	41 89 cf             	mov    %ecx,%r15d  |  %r15
=>  1  %ecx = 1
  ffffffffa03ee849:	41 56                	push   %r14        |  %r14
=>  ffffffffa03efaa0
  ffffffffa03ee84b:	41 55                	push   %r13
  ffffffffa03ee84d:	49 89 fd             	mov    %rdi,%r13   |  %edi
= ffff880419b600c0  %r13 =>  ffff880419b600c0
  ffffffffa03ee850:	41 54                	push   %r12        |  %r12
=>  ffff880419b600c0
  ffffffffa03ee852:	53                   	push   %rbx
  ffffffffa03ee853:	89 d3                	mov    %edx,%ebx   |  %ebx =>  18
  ffffffffa03ee855:	48 81 ec a8 00 00 00 	sub    $0xa8,%rsp
  ffffffffa03ee85c:	8b 15 00 00 00 00    	mov    0x0(%rip),%edx
# ffffffffa03ee862<kvm_set_irq+0x22>
  ffffffffa03ee862:	89 b5 3c ff ff ff    	mov    %esi,-0xc4(%rbp) |
%esi = 0
  ffffffffa03ee868:	85 d2                	test   %edx,%edx   |  %edx =>  0
  ffffffffa03ee86a:	0f 85 d5 00 00 00    	jne    ffffffffa03ee945
<kvm_set_irq+0x105>
  ffffffffa03ee870:	49 8b 85 58 24 00 00 	mov    0x2458(%r13),%rax |
%eax =>  b6634c1  %r13 = ffff880419b600c0
*ffffffffa03ee877:	3b 98 28 01 00 00    	cmp    0x128(%rax),%ebx |
%eax = b6634c1  %ebx = 18<--- faulting instruction
  ffffffffa03ee87d:	73 61                	jae    ffffffffa03ee8e0
<kvm_set_irq+0xa0>
  ffffffffa03ee87f:	89 db                	mov    %ebx,%ebx
  ffffffffa03ee881:	48 8b 84 d8 30 01 00 	mov    0x130(%rax,%rbx,8),%rax
  ffffffffa03ee888:	00
  ffffffffa03ee889:	48 85 c0             	test   %rax,%rax
  ffffffffa03ee88c:	74 52                	je     ffffffffa03ee8e0
<kvm_set_irq+0xa0>
  ffffffffa03ee88e:	48 8d 95 40 ff ff ff 	lea    -0xc0(%rbp),%rdx
  ffffffffa03ee895:	31 db                	xor    %ebx,%ebx
  ffffffffa03ee897:	48 8b 08             	mov    (%rax),%rcx
  ffffffffa03ee89a:	83 c3 01             	add    $0x1,%ebx
  ffffffffa03ee89d:	0f 18 09             	prefetcht0 (%rcx)
  ffffffffa03ee8a0:	48 8b 48 e0          	mov    -0x20(%rax),%rcx
  ffffffffa03ee8a4:	48 89 0a             	mov    %rcx,(%rdx)
  ffffffffa03ee8a7:	48 8b 48 e8          	mov    -0x18(%rax),%rcx
  ffffffffa03ee8ab:	48 89 4a 08          	mov    %rcx,0x8(%rdx)
  ffffffffa03ee8af:	48 8b 48 f0          	mov    -0x10(%rax),%rcx
  ffffffffa03ee8b3:	48 89 4a 10          	mov    %rcx,0x10(%rdx)
  ffffffffa03ee8b7:	48 8b 48 f8          	mov    -0x8(%rax),%rcx
  ffffffffa03ee8bb:	48 89 4a 18          	mov    %rcx,0x18(%rdx)
  ffffffffa03ee8bf:	48 8b 08             	mov    (%rax),%rcx

The relvant part of objdump for kvm_set_irq:
root@ayrshire:~# objdump -ldS
/lib/modules/2.6.37.2-dsiun-110105+/kernel/arch/x86/kvm/kvm.ko>
dump.txt

0000000000006840<kvm_set_irq>:
kvm_set_irq():
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:148
     6840:       55                      push   %rbp
     6841:       48 89 e5                mov    %rsp,%rbp
     6844:       41 57                   push   %r15
     6846:       41 89 cf                mov    %ecx,%r15d
     6849:       41 56                   push   %r14
     684b:       41 55                   push   %r13
     684d:       49 89 fd                mov    %rdi,%r13
     6850:       41 54                   push   %r12
     6852:       53                      push   %rbx
     6853:       89 d3                   mov    %edx,%ebx
     6855:       48 81 ec a8 00 00 00    sub    $0xa8,%rsp
trace_kvm_set_irq():
/usr/src/GIT/linux-2.6-stable/include/trace/events/kvm.h:10
     685c:       8b 15 00 00 00 00       mov    0x0(%rip),%edx
# 6862<kvm_set_irq+0x22>
kvm_set_irq():
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:148
     6862:       89 b5 3c ff ff ff       mov    %esi,-0xc4(%rbp)
trace_kvm_set_irq():
/usr/src/GIT/linux-2.6-stable/include/trace/events/kvm.h:10
     6868:       85 d2                   test   %edx,%edx
     686a:       0f 85 d5 00 00 00       jne    6945<kvm_set_irq+0x105>
kvm_set_irq():
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:161
     6870:       49 8b 85 58 24 00 00    mov    0x2458(%r13),%rax
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:162
     6877:       3b 98 28 01 00 00       cmp    0x128(%rax),%ebx
     687d:       73 61                   jae    68e0<kvm_set_irq+0xa0>
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:163
     687f:       89 db                   mov    %ebx,%ebx
     6881:       48 8b 84 d8 30 01 00    mov    0x130(%rax,%rbx,8),%rax
     6888:       00
     6889:       48 85 c0                test   %rax,%rax
     688c:       74 52                   je     68e0<kvm_set_irq+0xa0>
     688e:       48 8d 95 40 ff ff ff    lea    -0xc0(%rbp),%rdx
     6895:       31 db                   xor    %ebx,%ebx
     6897:       48 8b 08                mov    (%rax),%rcx
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:164
     689a:       83 c3 01                add    $0x1,%ebx
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:163
     689d:       0f 18 09                prefetcht0 (%rcx)
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:164
     68a0:       48 8b 48 e0             mov    -0x20(%rax),%rcx
     68a4:       48 89 0a                mov    %rcx,(%rdx)
     68a7:       48 8b 48 e8             mov    -0x18(%rax),%rcx
     68ab:       48 89 4a 08             mov    %rcx,0x8(%rdx)
     68af:       48 8b 48 f0             mov    -0x10(%rax),%rcx
     68b3:       48 89 4a 10             mov    %rcx,0x10(%rdx)
     68b7:       48 8b 48 f8             mov    -0x8(%rax),%rcx
     68bb:       48 89 4a 18             mov    %rcx,0x18(%rdx)
     68bf:       48 8b 08                mov    (%rax),%rcx
     68c2:       48 89 4a 20             mov    %rcx,0x20(%rdx)
     68c6:       48 8b 48 08             mov    0x8(%rax),%rcx
     68ca:       48 89 4a 28             mov    %rcx,0x28(%rdx)
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:163
     68ce:       48 8b 00                mov    (%rax),%rax
     68d1:       48 83 c2 30             add    $0x30,%rdx
     68d5:       48 85 c0                test   %rax,%rax
     68d8:       75 bd                   jne    6897<kvm_set_irq+0x57>
     68da:       eb 06                   jmp    68e2<kvm_set_irq+0xa2>
     68dc:       0f 1f 40 00             nopl   0x0(%rax)
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:162
     68e0:       31 db                   xor    %ebx,%ebx
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:169
     68e2:       4c 8d b5 40 ff ff ff    lea    -0xc0(%rbp),%r14
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:162
     68e9:       41 bc ff ff ff ff       mov    $0xffffffff,%r12d
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:167
     68ef:       85 db                   test   %ebx,%ebx
     68f1:       74 3d                   je     6930<kvm_set_irq+0xf0>
     68f3:       83 eb 01                sub    $0x1,%ebx
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:169
     68f6:       44 89 f9                mov    %r15d,%ecx
     68f9:       8b 95 3c ff ff ff       mov    -0xc4(%rbp),%edx
     68ff:       48 63 c3                movslq %ebx,%rax
     6902:       4c 89 ee                mov    %r13,%rsi
     6905:       48 8d 04 40             lea    (%rax,%rax,2),%rax
     6909:       48 c1 e0 04             shl    $0x4,%rax
     690d:       49 8d 3c 06             lea    (%r14,%rax,1),%rdi
     6911:       ff 94 05 48 ff ff ff    callq  *-0xb8(%rbp,%rax,1)
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:170
     6918:       85 c0                   test   %eax,%eax
     691a:       78 d3                   js     68ef<kvm_set_irq+0xaf>
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:173
     691c:       45 85 e4                test   %r12d,%r12d
     691f:       ba 00 00 00 00          mov    $0x0,%edx
     6924:       44 0f 48 e2             cmovs  %edx,%r12d
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:167
     6928:       85 db                   test   %ebx,%ebx
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:173
     692a:       46 8d 24 20             lea    (%rax,%r12,1),%r12d
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:167
     692e:       75 c3                   jne    68f3<kvm_set_irq+0xb3>
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:177
     6930:       48 81 c4 a8 00 00 00    add    $0xa8,%rsp
     6937:       44 89 e0                mov    %r12d,%eax
     693a:       5b                      pop    %rbx
     693b:       41 5c                   pop    %r12
     693d:       41 5d                   pop    %r13
     693f:       41 5e                   pop    %r14
     6941:       41 5f                   pop    %r15
     6943:       c9                      leaveq
     6944:       c3                      retq
trace_kvm_set_irq():
/usr/src/GIT/linux-2.6-stable/include/trace/events/kvm.h:10
     6945:       4c 8b 25 00 00 00 00    mov    0x0(%rip),%r12
# 694c<kvm_set_irq+0x10c>
     694c:       4d 85 e4                test   %r12,%r12
     694f:       0f 84 1b ff ff ff       je     6870<kvm_set_irq+0x30>
     6955:       49 8b 04 24             mov    (%r12),%rax
     6959:       49 8b 7c 24 08          mov    0x8(%r12),%rdi
     695e:       49 83 c4 10             add    $0x10,%r12
     6962:       8b 8d 3c ff ff ff       mov    -0xc4(%rbp),%ecx
     6968:       44 89 fa                mov    %r15d,%edx
     696b:       89 de                   mov    %ebx,%esi
     696d:       ff d0                   callq  *%rax
     696f:       49 8b 04 24             mov    (%r12),%rax
     6973:       48 85 c0                test   %rax,%rax
     6976:       75 e1                   jne    6959<kvm_set_irq+0x119>
     6978:       e9 f3 fe ff ff          jmpq   6870<kvm_set_irq+0x30>
kvm_set_irq():
     697d:       0f 1f 00                nopl   (%rax)

So, if i've read correctly, the offset is 0x6877 ?

root@ayrshire:~# addr2line -e
/lib/modules/2.6.37.2-dsiun-110105+/kernel/arch/x86/kvm/kvm.ko
0x6877
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:162


Is it the correct way to analyse this?

Regards.

Yes.  So we have:

         irq_rt = rcu_dereference(kvm->irq_routing);

  ffffffffa03ee870:	49 8b 85 58 24 00 00 	mov    0x2458(%r13),%rax |
%eax =>  b6634c1  %r13 = ffff880419b600c0

         if (irq<  irq_rt->nr_rt_entries)

*ffffffffa03ee877:	3b 98 28 01 00 00    	cmp    0x128(%rax),%ebx |
%eax = b6634c1  %ebx = 18<--- faulting instruction

The problem then is that while the kvm pointer is
ffff880419b600c0 which looks sane,
the value we read from kvm->irq_routing is b6634c1 which
does not make sense. When we dereference that, kaboom.

Is the kvm pointer wrong or the memory corrupted?
Try printing the kvm pointer during
initialization, e.g. in kvm_vm_ioctl_create_vcpu,
then and compare to markup_oops.


Hi,

so this time the bug is:

[17882.612303] BUG: unable to handle kernel paging request at 0000000000002458
[17882.612342] IP: [<ffffffffa03898a0>] kvm_set_irq+0x30/0x140 [kvm]

markup_oops give me this:

root@ayrshire:~# cat bug-0103.txt | perl markup_oops.pl -m /lib/modules/2.6.37.2-dsiun-110105+/kernel/arch/x86/kvm/kvm.ko /boot/vmlinuz-2.6.37.2-dsiun-110105+ vmaoffset = 18446744072102621184 ffffffffa0389871: 48 89 e5 mov %rsp,%rbp
 ffffffffa0389874:	41 57                	push   %r15
ffffffffa0389876: 41 89 cf mov %ecx,%r15d | %r15 => 1 %ecx = 1 ffffffffa0389879: 41 56 push %r14 | %r14 => ffffffffa038aad0
 ffffffffa038987b:	41 55                	push   %r13
ffffffffa038987d: 49 89 fd mov %rdi,%r13 | %edi = 0 %r13 => 0
 ffffffffa0389880:	41 54                	push   %r12        |  %r12 => 0
 ffffffffa0389882:	53                   	push   %rbx
 ffffffffa0389883:	89 d3                	mov    %edx,%ebx   |  %ebx => 1a
 ffffffffa0389885:	48 81 ec a8 00 00 00 	sub    $0xa8,%rsp
ffffffffa038988c: 8b 15 00 00 00 00 mov 0x0(%rip),%edx # ffffffffa0389892 <kvm_set_irq+0x22> ffffffffa0389892: 89 b5 3c ff ff ff mov %esi,-0xc4(%rbp) | %esi = 0
 ffffffffa0389898:	85 d2                	test   %edx,%edx   |  %edx => 0
ffffffffa038989a: 0f 85 d5 00 00 00 jne ffffffffa0389975 <kvm_set_irq+0x105> *ffffffffa03898a0: 49 8b 85 58 24 00 00 mov 0x2458(%r13),%rax | %eax = 0 %r13 = 0 <--- faulting instruction
 ffffffffa03898a7:	3b 98 28 01 00 00    	cmp    0x128(%rax),%ebx
ffffffffa03898ad: 73 61 jae ffffffffa0389910 <kvm_set_irq+0xa0>
 ffffffffa03898af:	89 db                	mov    %ebx,%ebx
 ffffffffa03898b1:	48 8b 84 d8 30 01 00 	mov    0x130(%rax,%rbx,8),%rax
 ffffffffa03898b8:	00
 ffffffffa03898b9:	48 85 c0             	test   %rax,%rax
ffffffffa03898bc: 74 52 je ffffffffa0389910 <kvm_set_irq+0xa0>
 ffffffffa03898be:	48 8d 95 40 ff ff ff 	lea    -0xc0(%rbp),%rdx
 ffffffffa03898c5:	31 db                	xor    %ebx,%ebx
 ffffffffa03898c7:	48 8b 08             	mov    (%rax),%rcx
 ffffffffa03898ca:	83 c3 01             	add    $0x1,%ebx
 ffffffffa03898cd:	0f 18 09             	prefetcht0 (%rcx)
 ffffffffa03898d0:	48 8b 48 e0          	mov    -0x20(%rax),%rcx
 ffffffffa03898d4:	48 89 0a             	mov    %rcx,(%rdx)
 ffffffffa03898d7:	48 8b 48 e8          	mov    -0x18(%rax),%rcx
 ffffffffa03898db:	48 89 4a 08          	mov    %rcx,0x8(%rdx)
 ffffffffa03898df:	48 8b 48 f0          	mov    -0x10(%rax),%rcx
 ffffffffa03898e3:	48 89 4a 10          	mov    %rcx,0x10(%rdx)
 ffffffffa03898e7:	48 8b 48 f8          	mov    -0x8(%rax),%rcx
 ffffffffa03898eb:	48 89 4a 18          	mov    %rcx,0x18(%rdx)

wich correspond to offset 68a0 (from objdump):

kvm_set_irq():
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:161
    68a0:       49 8b 85 58 24 00 00    mov    0x2458(%r13),%rax
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:162
    68a7:       3b 98 28 01 00 00       cmp    0x128(%rax),%ebx

root@ayrshire:~# addr2line -e /lib/modules/2.6.37.2-dsiun-110105+/kernel/arch/x86/kvm/kvm.ko 0x68a0
/usr/src/GIT/linux-2.6-stable/arch/x86/kvm/../../../virt/kvm/irq_comm.c:161

So here kvm->irq_routing is null.

How can it be?

Regards.
begin:vcard
fn:Jean-Philippe Menil
n:Menil;Jean-Philippe
org;quoted-printable:Universit=C3=A9 de Nantes;IRTS - DSI
adr;quoted-printable:;;2 rue de la Houssini=C3=A8re;Nantes;Loire-Atlantique;44382;France
email;internet:jean-philippe.menil@xxxxxxxxxxxxxx
title;quoted-printable:Administrateur R=C3=A9seau
url:http://www.cri.univ-nantes.fr
version:2.1
end:vcard


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