Re: Bug inkvm_set_irq

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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.
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