Date:	Wed, 21 Nov 2012 15:36:50 -0800
From:	Vincent Li <vincent.mc.li@...il.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: KVM Disk i/o or VM activities causes soft lockup?

Hi,

We have users running on redhat based distro (Kernel
2.6.32-131.21.1.el6.x86_64 ) with kvm, when customer made cron job
script to copy large files between kvm guest or some other user space
program leads to disk i/o or VM activities, users get following soft
lockup message from console:

Nov 17 13:44:46 slot1/luipaard100a err kernel: BUG: soft lockup -
CPU#4 stuck for 61s! [qemu-kvm:6795]
Nov 17 13:44:46 slot1/luipaard100a warning kernel: Modules linked in:
ebt_vlan nls_utf8 isofs ebtable_filter ebtables 8021q garp bridge stp
llc ipt_REJECT iptable_filter xt_NOTRACK nf_conntrack iptable_raw
ip_tables loop ext2 binfmt_misc hed womdict(U) vnic(U) parport_pc lp
parport predis(U) lasthop(U) ipv6 toggler vhost_net tun kvm_intel kvm
jiffies(U) sysstats hrsleep i2c_dev datastor(U) linux_user_bde(P)(U)
linux_kernel_bde(P)(U) tg3 libphy serio_raw i2c_i801 i2c_core ehci_hcd
raid1 raid0 virtio_pci virtio_blk virtio virtio_ring mvsas libsas
scsi_transport_sas mptspi mptscsih mptbase scsi_transport_spi 3w_9xxx
sata_svw(U) ahci serverworks sata_sil ata_piix libata sd_mod
crc_t10dif amd74xx piix ide_gd_mod ide_core dm_snapshot dm_mirror
dm_region_hash dm_log dm_mod ext3 jbd mbcache
Nov 17 13:44:46 slot1/luipaard100a warning kernel: Pid: 6795, comm:
qemu-kvm Tainted: P           ----------------
2.6.32-131.21.1.el6.f5.x86_64 #1
Nov 17 13:44:46 slot1/luipaard100a warning kernel: Call Trace:
Nov 17 13:44:46 slot1/luipaard100a warning kernel: <IRQ>
[<ffffffff81084f95>] ? get_timestamp+0x9/0xf
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff810855d6>] ? watchdog_timer_fn+0x130/0x178
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff81059f11>] ? __run_hrtimer+0xa3/0xff
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff8105a188>] ? hrtimer_interrupt+0xe6/0x190
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff8105a14b>] ? hrtimer_interrupt+0xa9/0x190
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff8101e5a9>] ? hpet_interrupt_handler+0x26/0x2d
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff8105a26f>] ? hrtimer_peek_ahead_timers+0x9/0xd
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff81044fcc>] ? __do_softirq+0xc5/0x17a
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff81003adc>] ? call_softirq+0x1c/0x28
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff8100506b>] ? do_softirq+0x31/0x66
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff81003673>] ? call_function_interrupt+0x13/0x20
Nov 17 13:44:46 slot1/luipaard100a warning kernel: <EOI>
[<ffffffffa0219986>] ? vmx_get_msr+0x0/0x123 [kvm_intel]
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffffa01d11c0>] ? kvm_arch_vcpu_ioctl_run+0x80e/0xaf1 [kvm]
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffffa01d11b4>] ? kvm_arch_vcpu_ioctl_run+0x802/0xaf1 [kvm]
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff8114e59b>] ? inode_has_perm+0x65/0x72
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffffa01c77f5>] ? kvm_vcpu_ioctl+0xf2/0x5ba [kvm]
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff8114e642>] ? file_has_perm+0x9a/0xac
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff810f9ec2>] ? vfs_ioctl+0x21/0x6b
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff810fa406>] ? do_vfs_ioctl+0x487/0x4da
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff810fa4aa>] ? sys_ioctl+0x51/0x70
Nov 17 13:44:46 slot1/luipaard100a warning kernel:
[<ffffffff810029d1>] ? system_call_fastpath+0x3c/0x41

or

BUG: soft lockup - CPU#2 stuck for 11s! [ksoftirqd/2:13]
Modules linked in: ebt_vlan ebtable_filter ebtables 8021q garp bridge
stp llc ipt_REJECT iptable_filter xt_NOTRACK nf_conntrack iptable_raw
ip_tables loop ext2 binfmt_misc hed womdict(U) vnic(U) parport_pc lp
parport predis(U) lasthop(U) ipv6 toggler vhost_net tun kvm_intel kvm
jiffies(U) sysstats hrsleep i2c_dev datastor(U) linux_user_bde(P)(U)
linux_kernel_bde(P)(U) serio_raw tg3 libphy ehci_hcd i2c_i801 i2c_core
raid1 raid0 virtio_pci virtio_blk virtio virtio_ring mvsas libsas
scsi_transport_sas mptspi mptscsih mptbase scsi_transport_spi 3w_9xxx
sata_svw(U) ahci serverworks sata_sil ata_piix libata sd_mod
crc_t10dif amd74xx piix ide_gd_mod ide_core dm_snapshot dm_mirror
dm_region_hash dm_log dm_mod ext3 jbd mbcache
Pid: 13, comm: ksoftirqd/2 Tainted: P           ----------------
2.6.32-131.21.1.el6.x86_64 #1
Call Trace:
 <IRQ>  [<ffffffff81084f95>] ? get_timestamp+0x9/0xf
 [<ffffffff810855d6>] ? watchdog_timer_fn+0x130/0x178
 [<ffffffff81059f11>] ? __run_hrtimer+0xa3/0xff
 [<ffffffff81088e33>] ? __rcu_process_callbacks+0xdd/0x252
 [<ffffffff8105a14b>] ? hrtimer_interrupt+0xa9/0x190
 [<ffffffff81045041>] ? __do_softirq+0x13a/0x17a
 [<ffffffff8105a26f>] ? hrtimer_peek_ahead_timers+0x9/0xd
 [<ffffffff81044fcc>] ? __do_softirq+0xc5/0x17a
 [<ffffffff81044ced>] ? ksoftirqd+0x0/0xbe
 [<ffffffff81003adc>] ? call_softirq+0x1c/0x28
 <EOI>  [<ffffffff8100506b>] ? do_softirq+0x31/0x66
 [<ffffffff81044ced>] ? ksoftirqd+0x0/0xbe
 [<ffffffff81044d42>] ? ksoftirqd+0x55/0xbe
 [<ffffffff81044ced>] ? ksoftirqd+0x0/0xbe
 [<ffffffff81057089>] ? kthread+0x79/0x84
 [<ffffffff810039da>] ? child_rip+0xa/0x20
 [<ffffffff81057010>] ? kthread+0x0/0x84
 [<ffffffff810039d0>] ? child_rip+0x0/0x20

I am wondering if there is known issue in kernel world, any info would
be helpful.

Thanks

Vincent
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