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

Thu Jan 12 20:37:09 UTC 2012

On 12.01.2012 20:36, Akemi Yagi wrote:
> On Thu, Jan 12, 2012 at 10:53 AM, Morten Stevens
> <mstevens at imt-systems.com> wrote:
>> 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)
>
>> 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)
>
>> Any ideas?
>
> Maybe related to this:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=770228

Hi Akemi,

Yes, you're right.

I see the same bug on kvm guests with kernel 2.6.32-220.2.1.

For example:

Jan 12 18:10:58 mail kernel: ------------[ cut here ]------------
Jan 12 18:10:58 mail kernel: WARNING: at kernel/sched.c:5914 
thread_return+0x232/0x79d() (Not tainted)
Jan 12 18:10:58 mail kernel: Hardware name: KVM
Jan 12 18:10:58 mail kernel: Modules linked in: xt_multiport 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 virtio_balloon virtio_net i2c_piix4 i2c_core sg ext4 
mbcache jbd2 virtio_blk sr_mod cdrom virtio_pci virtio_ring virtio 
pata_acpi ata_generic ata_piix dm_mod [last unloaded: scsi_wait_scan]
Jan 12 18:10:58 mail kernel: Pid: 19535, comm: imap-login Not tainted 
2.6.32-220.2.1.el6.x86_64 #1
Jan 12 18:10:58 mail kernel: Call Trace:
Jan 12 18:10:58 mail kernel: [<ffffffff81069997>] ? 
warn_slowpath_common+0x87/0xc0
Jan 12 18:10:58 mail kernel: [<ffffffff810699ea>] ? 
warn_slowpath_null+0x1a/0x20
Jan 12 18:10:58 mail kernel: [<ffffffff814eccc5>] ? 
thread_return+0x232/0x79d
Jan 12 18:10:58 mail kernel: [<ffffffff814ed902>] ? 
schedule_timeout+0x192/0x2e0
Jan 12 18:10:58 mail kernel: [<ffffffff8107c020>] ? 
process_timeout+0x0/0x10
Jan 12 18:10:58 mail kernel: [<ffffffff811b9b59>] ? 
sys_epoll_wait+0x239/0x300
Jan 12 18:10:58 mail kernel: [<ffffffff8105e770>] ? 
default_wake_function+0x0/0x20
Jan 12 18:10:58 mail kernel: [<ffffffff8100b0f2>] ? 
system_call_fastpath+0x16/0x1b
Jan 12 18:10:58 mail kernel: ---[ end trace f10d5daaadbce260 ]---

Jan 12 17:58:07 acsinet20 kernel: ------------[ cut here ]------------
Jan 12 17:58:07 acsinet20 kernel: WARNING: at kernel/sched.c:5914 
thread_return+0x232/0x79d() (Not tainted)
Jan 12 17:58:07 acsinet20 kernel: Hardware name: KVM
Jan 12 17:58:07 acsinet20 kernel: Modules linked in: 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 virtio_balloon virtio_net i2c_piix4 i2c_core sg ext4 
mbcache jbd2 virtio_blk sr_mod cdrom virtio_pci virtio_ring virtio 
pata_acpi ata_generic ata_piix dm_mod [last unloaded: scsi_wait_scan]
Jan 12 17:58:07 acsinet20 kernel: Pid: 1268, comm: fail2ban-server Not 
tainted 2.6.32-220.2.1.el6.x86_64 #1
Jan 12 17:58:07 acsinet20 kernel: Call Trace:
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81069997>] ? 
warn_slowpath_common+0x87/0xc0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff810699ea>] ? 
warn_slowpath_null+0x1a/0x20
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff814eccc5>] ? 
thread_return+0x232/0x79d
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff810958e3>] ? 
__hrtimer_start_range_ns+0x1a3/0x460
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81094dc1>] ? 
lock_hrtimer_base+0x31/0x60
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8103840c>] ? 
pvclock_clocksource_read+0x5c/0xd0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff814ee498>] ? 
schedule_hrtimeout_range+0xc8/0x160
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81094b70>] ? 
hrtimer_wakeup+0x0/0x30
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81095bd4>] ? 
hrtimer_start_range_ns+0x14/0x20
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8118b079>] ? 
poll_schedule_timeout+0x39/0x60
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8118b6e8>] ? 
do_select+0x578/0x6b0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8100bc4e>] ? 
invalidate_interrupt0+0xe/0x20
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8118b820>] ? 
__pollwait+0x0/0xf0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81030168>] ? 
flat_send_IPI_mask+0x68/0x90
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81047cf8>] ? 
flush_tlb_others_ipi+0x128/0x130
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81047d76>] ? 
native_flush_tlb_others+0x76/0x90
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8126a491>] ? 
cpumask_any_but+0x31/0x50
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81047e88>] ? 
flush_tlb_page+0x48/0xb0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81046e6d>] ? 
ptep_set_access_flags+0x6d/0x70
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8113ac0b>] ? 
do_wp_page+0x44b/0x8d0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8113b86d>] ? 
handle_pte_fault+0x2cd/0xb50
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8100bc0e>] ? 
apic_timer_interrupt+0xe/0x20
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8100bc0e>] ? 
apic_timer_interrupt+0xe/0x20
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8118c30a>] ? 
core_sys_select+0x18a/0x2c0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8113c2d4>] ? 
handle_mm_fault+0x1e4/0x2b0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff810dea2e>] ? 
call_rcu+0xe/0x10
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81038408>] ? 
pvclock_clocksource_read+0x58/0xd0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81038408>] ? 
pvclock_clocksource_read+0x58/0xd0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8103750c>] ? 
kvm_clock_read+0x1c/0x20
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff81037519>] ? 
kvm_clock_get_cycles+0x9/0x10
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8109b629>] ? 
ktime_get_ts+0xa9/0xe0
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8118c697>] ? 
sys_select+0x47/0x110
Jan 12 17:58:07 acsinet20 kernel: [<ffffffff8100b0f2>] ? 
system_call_fastpath+0x16/0x1b
Jan 12 17:58:07 acsinet20 kernel: ---[ end trace 3d099e90a36a28d0 ]---

Best regards,

Morten