Date:	Fri, 25 Feb 2011 10:07:22 +0100
From:	Jean-Philippe Menil <jean-philippe.menil@...v-nantes.fr>
To:	kvm@...r.kernel.org
CC:	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Bug inkvm_set_irq

Hi,

Each time i try tou use vhost_net, i'm facing a kernel bug.
I do a "modprobe vhost_net", and start guest whith vhost=on.

Following is a trace with a kernel 2.6.37, but  i had the same problem 
with 2.6.36 (cf https://lkml.org/lkml/2010/11/30/29).

The bug only occurs whith vhost_net charged, so i don't know if this is 
a bug in kvm module code or in the vhost_net code.

Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.243100] 
BUG: unable to handle kernel paging request at 0000000000002458
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.243250] 
IP: [<ffffffffa041aa8a>] kvm_set_irq+0x2a/0x130 [kvm]
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.243378] 
PGD 45d363067 PUD 45e77a067 PMD 0
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.243556] 
Oops: 0000 [#1] SMP
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.243692] 
last sysfs file: 
/sys/devices/pci0000:00/0000:00:0d.0/0000:05:00.0/0000:06:00.0/irq
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.243777] CPU 0
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.243820] 
Modules linked in: vhost_net macvtap macvlan tun powernow_k8 mperf 
cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_ondemand fre
q_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_connt
rack_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 tpm_tis tpm ps
mouse dcdbas tpm_bios processor i2c_nforce2 shpchp pcspkr ghes serio_raw 
joydev evdev pci_hotplug i2c_core hed button thermal_sys xfs exportfs 
dm_mod sg sr_mod cdrom usbhid hid usb_storage ses sd_mod enclosu
re megaraid_sas ohci_hcd lpfc scsi_transport_fc scsi_tgt bnx2 scsi_mod 
ehci_hcd [last unloaded: scsi_wait_scan]
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
Pid: 10, comm: kworker/0:1 Not tainted 2.6.37-dsiun-110105 #17 
0K543T/PowerEdge M605
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
RIP: 0010:[<ffffffffa041aa8a>]  [<ffffffffa041aa8a>] 
kvm_set_irq+0x2a/0x130 [kvm]
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
RSP: 0018:ffff88045fc89d30  EFLAGS: 00010246
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
RAX: 0000000000000000 RBX: 000000000000001a RCX: 0000000000000001
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff880856a91e48
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
R10: 0000000000000000 R11: 00000000ffffffff R12: 0000000000000000
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
FS:  00007f617986c710(0000) GS:ffff88007f800000(0000) knlGS:0000000000000000
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
CR2: 0000000000002458 CR3: 000000045d197000 CR4: 00000000000006f0
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
Process kworker/0:1 (pid: 10, threadinfo ffff88045fc88000, task 
ffff88085fc53c30)
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] Stack:
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
ffff88045fc89fd8 00000000000119c0 ffff88045fc88010 ffff88085fc53ee8
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
ffff88045fc89fd8 ffff88085fc53ee0 ffff88085fc53c30 00000000000119c0
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
00000000000119c0 ffffffff8137f7ce ffff88007f80df40 00000000ffffffff
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
Call Trace:
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff8137f7ce>] ? common_interrupt+0xe/0x13
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffffa041bc30>] ? irqfd_inject+0x0/0x50 [kvm]
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffffa041bc57>] ? irqfd_inject+0x27/0x50 [kvm]
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffffa041bc30>] ? irqfd_inject+0x0/0x50 [kvm]
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff8106b6f2>] ? process_one_work+0x112/0x460
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff8106be25>] ? worker_thread+0x145/0x410
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff8103a3d0>] ? __wake_up_common+0x50/0x80
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff8106bce0>] ? worker_thread+0x0/0x410
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff8106bce0>] ? worker_thread+0x0/0x410
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff8106f786>] ? kthread+0x96/0xa0
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff81003ce4>] ? kernel_thread_helper+0x4/0x10
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff8106f6f0>] ? kthread+0x0/0xa0
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
[<ffffffff81003ce0>] ? kernel_thread_helper+0x0/0x10
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
Code: ff 41 57 41 89 f7 41 56 41 55 41 89 cd 41 54 49 89 fc 55 53 89 d3 
48 81 ec 98 00 00 00 8b 15 c6 79 03 00 85 d2 0f 85 c4 00 00 00 <4
9> 8b 84 24 58 24 00 00 3b 98 28 01 00 00 73 5e 89 db 48 8b 84
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
RIP  [<ffffffffa041aa8a>] kvm_set_irq+0x2a/0x130 [kvm]
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123]  
RSP <ffff88045fc89d30>
Feb 23 13:56:19 ayrshire.u06.univ-nantes.prive kernel: [  685.246123] 
CR2: 0000000000002458


If someone can help me, on how to solve this.

Regards.

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