[rhelv6-list] Kernel 2.6.32-220.2.1 KVM bug?

[Morten Stevens]

Hi,

After updating to 6.2 I see the following error on two different 
systems:

Both servers are running as KVM hypvervisor with multiple linux guests.

System 1)

Jan 12 00:30:35 kvm-001 kernel: ------------[ cut here ]------------
Jan 12 00:30:35 kvm-001 kernel: WARNING: at kernel/sched.c:5914 
thread_return+0x232/0x79d() (Not tainted)
Jan 12 00:30:35 kvm-001 kernel: Hardware name: IBM System x3550 
-[7978C2G]-
Jan 12 00:30:35 kvm-001 kernel: Modules linked in: ebtable_nat ebtables 
sunrpc bridge stp llc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 
iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 
xt_state nf_conntrack ip6table_filter ip6_tables ipv6 vhost_net macvtap 
macvlan tun kvm_intel kvm bnx2 ses enclosure ibmpex ibmaem 
ipmi_msghandler ics932s401 sg serio_raw i2c_i801 iTCO_wdt 
iTCO_vendor_support i5000_edac edac_core i5k_amb ioatdma dca shpchp ext4 
mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom aacraid pata_acpi 
ata_generic ata_piix radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core 
dm_mod [last unloaded: scsi_wait_scan]
Jan 12 00:30:35 kvm-001 kernel: Pid: 1572, comm: qemu-kvm Not tainted 
2.6.32-220.2.1.el6.x86_64 #1
Jan 12 00:30:35 kvm-001 kernel: Call Trace:
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff81069997>] ? 
warn_slowpath_common+0x87/0xc0
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff810699ea>] ? 
warn_slowpath_null+0x1a/0x20
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff814eccc5>] ? 
thread_return+0x232/0x79d
Jan 12 00:30:35 kvm-001 kernel: [<ffffffffa0354889>] ? 
vmx_vcpu_load+0x89/0x130 [kvm_intel]
Jan 12 00:30:35 kvm-001 kernel: [<ffffffffa0352106>] ? 
__vmx_load_host_state+0xe6/0x100 [kvm_intel]
Jan 12 00:30:35 kvm-001 kernel: [<ffffffffa02f3dd5>] ? 
kvm_vcpu_block+0x75/0xc0 [kvm]
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff81090a10>] ? 
autoremove_wake_function+0x0/0x40
Jan 12 00:30:35 kvm-001 kernel: [<ffffffffa03079fc>] ? 
kvm_arch_vcpu_ioctl_run+0x49c/0xf10 [kvm]
Jan 12 00:30:35 kvm-001 kernel: [<ffffffffa02f1322>] ? 
kvm_vcpu_ioctl+0x522/0x670 [kvm]
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff8105e782>] ? 
default_wake_function+0x12/0x20
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff8118b966>] ? 
pollwake+0x56/0x60
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff8105e770>] ? 
default_wake_function+0x0/0x20
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff8104c969>] ? 
__wake_up_common+0x59/0x90
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff81053200>] ? 
__dequeue_entity+0x30/0x50
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff81189162>] ? 
vfs_ioctl+0x22/0xa0
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff8104c9d8>] ? 
__wake_up_locked_key+0x18/0x20
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff811bc673>] ? 
eventfd_write+0x193/0x1d0
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff8118962a>] ? 
do_vfs_ioctl+0x3aa/0x580
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff810a54ab>] ? 
sys_futex+0x7b/0x170
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff81189881>] ? 
sys_ioctl+0x81/0xa0
Jan 12 00:30:35 kvm-001 kernel: [<ffffffff8100b0f2>] ? 
system_call_fastpath+0x16/0x1b
Jan 12 00:30:35 kvm-001 kernel: ---[ end trace 4b636dcb9348f551 ]---

System 2)

Jan 11 23:36:47 kvm-002 kernel: ------------[ cut here ]------------
Jan 11 23:36:47 kvm-002 kernel: WARNING: at kernel/sched.c:5914 
thread_return+0x232/0x79d() (Not tainted)
Jan 11 23:36:47 kvm-002 kernel: Hardware name: IBM System x3550 
-[7978C2G]-
Jan 11 23:36:47 kvm-002 kernel: Modules linked in: ipmi_si ipmi_devintf 
ebtable_nat ebtables sunrpc bridge stp llc ipt_REJECT nf_conntrack_ipv4 
nf_defrag_ipv4 iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 
nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables ipv6 
vhost_net macvtap macvlan tun kvm_intel kvm bnx2 ses enclosure ibmpex 
ibmaem ipmi_msghandler ics932s401 i2c_i801 serio_raw sg iTCO_wdt 
iTCO_vendor_support i5000_edac edac_core i5k_amb ioatdma dca shpchp ext4 
mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom aacraid pata_acpi 
ata_generic ata_piix radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core 
dm_mod [last unloaded: scsi_wait_scan]
Jan 11 23:36:47 kvm-002 kernel: Pid: 1772, comm: kvm-pit-wq Not tainted 
2.6.32-220.2.1.el6.x86_64 #1
Jan 11 23:36:47 kvm-002 kernel: Call Trace:
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff81069997>] ? 
warn_slowpath_common+0x87/0xc0
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff810699ea>] ? 
warn_slowpath_null+0x1a/0x20
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff814eccc5>] ? 
thread_return+0x232/0x79d
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff81090cfe>] ? 
prepare_to_wait+0x4e/0x80
Jan 11 23:36:47 kvm-002 kernel: [<ffffffffa031bbe0>] ? 
pit_do_work+0x0/0xf0 [kvm]
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff8108b15c>] ? 
worker_thread+0x1fc/0x2a0
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff81090a10>] ? 
autoremove_wake_function+0x0/0x40
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff8108af60>] ? 
worker_thread+0x0/0x2a0
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff810906a6>] ? 
kthread+0x96/0xa0
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff8100c14a>] ? 
child_rip+0xa/0x20
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff81090610>] ? kthread+0x0/0xa0
Jan 11 23:36:47 kvm-002 kernel: [<ffffffff8100c140>] ? 
child_rip+0x0/0x20
Jan 11 23:36:47 kvm-002 kernel: ---[ end trace 1d94fe6e30260f41 ]---

Any ideas?

Thanks.

Best regards,

Morten