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Date: Fri, 23 Nov 2012 08:29:41 +0100
From: Stefan Hajnoczi <stefanha@gmail.com>
To: Vincent Li <vincent.mc.li@gmail.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: KVM Disk i/o or VM activities causes soft lockup?
Message-ID: <20121123072941.GH22787@stefanha-thinkpad.hitronhub.home>
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On Wed, Nov 21, 2012 at 03:36:50PM -0800, Vincent Li wrote:
> 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

This soft lockup is report on the host?

Stefan
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