syzbot

INFO: task kworker/0:5:8838 blocked for more than 143 seconds.
      Not tainted 5.4.0-rc2+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:5     D26392  8838      2 0x80004000
Workqueue: events switchdev_deferred_process_work
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
 schedule+0xd9/0x260 kernel/sched/core.c:4136
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:74
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
INFO: task kworker/0:2:27082 blocked for more than 143 seconds.
      Not tainted 5.4.0-rc2+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:2     D26416 27082      2 0x80004000
Workqueue: events linkwatch_event
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
 schedule+0xd9/0x260 kernel/sched/core.c:4136
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 linkwatch_event+0xf/0x70 net/core/link_watch.c:242
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
INFO: task syz-executor.1:22256 blocked for more than 143 seconds.
      Not tainted 5.4.0-rc2+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D28504 22256   9112 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
 schedule+0xd9/0x260 kernel/sched/core.c:4136
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 ipv6_route_ioctl+0x283/0x350 net/ipv6/route.c:4297
 inet6_ioctl+0x17c/0x1c0 net/ipv6/af_inet6.c:549
 sock_do_ioctl+0xd8/0x2f0 net/socket.c:1038
 sock_ioctl+0x3ed/0x780 net/socket.c:1189
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: Bad RIP value.
RSP: 002b:00007f76f14e6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59
RDX: 0000000020000080 RSI: 000000000000890b RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f76f14e76d4
R13: 00000000004c58bb R14: 00000000004da458 R15: 00000000ffffffff
INFO: task syz-executor.0:22233 blocked for more than 144 seconds.
      Not tainted 5.4.0-rc2+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29296 22233  31162 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
 schedule+0xd9/0x260 kernel/sched/core.c:4136
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1051
 sock_ioctl+0x3ed/0x780 net/socket.c:1189
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: Bad RIP value.
RSP: 002b:00007f9351df7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9351df86d4
R13: 00000000004c3458 R14: 00000000004d7080 R15: 00000000ffffffff
INFO: task syz-executor.5:22648 blocked for more than 144 seconds.
      Not tainted 5.4.0-rc2+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28744 22648  31163 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
 schedule+0xd9/0x260 kernel/sched/core.c:4136
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1051
 sock_ioctl+0x3ed/0x780 net/socket.c:1189
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: Bad RIP value.
RSP: 002b:00007f92a8e28c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f92a8e296d4
R13: 00000000004c3458 R14: 00000000004d7080 R15: 00000000ffffffff
INFO: task syz-executor.5:22649 blocked for more than 144 seconds.
      Not tainted 5.4.0-rc2+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D26480 22649  31163 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
 schedule+0xd9/0x260 kernel/sched/core.c:4136
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1051
 sock_ioctl+0x3ed/0x780 net/socket.c:1189
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: Bad RIP value.
RSP: 002b:00007f92a8e07c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f92a8e086d4
R13: 00000000004c3458 R14: 00000000004d7080 R15: 00000000ffffffff
INFO: task syz-executor.3:22657 blocked for more than 145 seconds.
      Not tainted 5.4.0-rc2+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D29392 22657  31158 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
 schedule+0xd9/0x260 kernel/sched/core.c:4136
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4195
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1103
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1051
 sock_ioctl+0x3ed/0x780 net/socket.c:1189
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: Bad RIP value.
RSP: 002b:00007feb721a5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007feb721a66d4
R13: 00000000004c3458 R14: 00000000004d7080 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1064:
 #0: ffffffff88faae00 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5337
2 locks held by rsyslogd/8946:
 #0: ffff8880978e65e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
 #1: ffff8880ae834d18 (&rq->lock){-.-.}, at: clockevents_program_event+0x15a/0x370 kernel/time/clockevents.c:326
2 locks held by getty/9068:
 #0: ffff888093f97090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc90005f712e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9069:
 #0: ffff888095333090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc90005f6d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9070:
 #0: ffff888097d49090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc90005f792e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9071:
 #0: ffff888094cf5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc90005f752e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9072:
 #0: ffff888095170090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc90005f7d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9073:
 #0: ffff888096562090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc90005f852e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9074:
 #0: ffff88809ee15090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc90005f552e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
4 locks held by kworker/u4:8/11974:
 #0: ffff8880a9a1ed28 ((wq_completion)netns){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8880a9a1ed28 ((wq_completion)netns){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880a9a1ed28 ((wq_completion)netns){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8880a9a1ed28 ((wq_completion)netns){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8880a9a1ed28 ((wq_completion)netns){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline]
 #0: ffff8880a9a1ed28 ((wq_completion)netns){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
 #0: ffff8880a9a1ed28 ((wq_completion)netns){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2240
 #1: ffff8880598afdc0 (net_cleanup_work){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2244
 #2: ffffffff8998af48 (pernet_ops_rwsem){++++}, at: cleanup_net+0xae/0xa60 net/core/net_namespace.c:556
 #3: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
3 locks held by kworker/0:5/8838:
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2240
 #1: ffff88804056fdc0 (deferred_process_work){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2244
 #2: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
3 locks held by kworker/0:2/27082:
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
 #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2240
 #1: ffff8880983ffdc0 ((linkwatch_work).work){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2244
 #2: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
3 locks held by kworker/1:4/31175:
 #0: ffff88809c142d28 ((wq_completion)ipv6_addrconf){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff88809c142d28 ((wq_completion)ipv6_addrconf){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff88809c142d28 ((wq_completion)ipv6_addrconf){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff88809c142d28 ((wq_completion)ipv6_addrconf){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff88809c142d28 ((wq_completion)ipv6_addrconf){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline]
 #0: ffff88809c142d28 ((wq_completion)ipv6_addrconf){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
 #0: ffff88809c142d28 ((wq_completion)ipv6_addrconf){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2240
 #1: ffff8880673f7dc0 ((addr_chk_work).work){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2244
 #2: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
1 lock held by syz-executor.2/22214:
1 lock held by syz-executor.1/22256:
 #0: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
1 lock held by syz-executor.0/22233:
 #0: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
1 lock held by syz-executor.5/22648:
 #0: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
1 lock held by syz-executor.5/22649:
 #0: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
1 lock held by syz-executor.3/22657:
 #0: ffffffff899981a0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1064 Comm: khungtaskd Not tainted 5.4.0-rc2+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0x9d0/0xef0 kernel/hung_task.c:289
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60