sched: DL replenish lagged too much INFO: task udevd:582 blocked for more than 140 seconds. Not tainted 4.9.177+ #9 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. udevd D27672 582 470 0x00000000 ffff8801cf874740 ffff8801d06dc780 ffff8801db721000 ffff8801cf875f00 ffff8801db721018 ffff8801cf9df990 ffffffff82808afe 0000000000000246 ffff8801cf874740 0000000000000000 ffff8801db7218f0 1ffff10039f3bf21 Call Trace: [<00000000acbe1da5>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000d8dc6e5d>] __rt_mutex_slowlock+0x99/0x290 kernel/locking/rtmutex.c:1221 [<000000000789a60c>] rt_mutex_slowlock+0x199/0x4c0 kernel/locking/rtmutex.c:1293 [<00000000faa76074>] rt_mutex_fastlock kernel/locking/rtmutex.c:1439 [inline] [<00000000faa76074>] rt_mutex_lock+0x2d/0x40 kernel/locking/rtmutex.c:1499 [<00000000ce1277ee>] process_notifier drivers/misc/uid_sys_stats.c:636 [inline] [<00000000ce1277ee>] process_notifier+0x96/0x670 drivers/misc/uid_sys_stats.c:625 [<00000000cbfadcc7>] notifier_call_chain+0xb4/0x1d0 kernel/notifier.c:93 [<00000000db8d2182>] __blocking_notifier_call_chain kernel/notifier.c:317 [inline] [<00000000db8d2182>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] [<00000000db8d2182>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] [<00000000db8d2182>] blocking_notifier_call_chain+0x80/0xa0 kernel/notifier.c:325 [<0000000076ee5975>] profile_task_exit+0x1f/0x30 kernel/profile.c:140 [<0000000013d6778a>] do_exit+0x90/0x2aa0 kernel/exit.c:744 [<00000000c1710df1>] do_group_exit+0x111/0x300 kernel/exit.c:945 [<00000000b35fc376>] SYSC_exit_group kernel/exit.c:956 [inline] [<00000000b35fc376>] SyS_exit_group+0x1d/0x20 kernel/exit.c:954 [<0000000017851c1c>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000801226ac>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<000000009a94eacc>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<000000009a94eacc>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<00000000f0c74333>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by udevd/582: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by udevd/584: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by rsyslogd/1893: #0: (&f->f_pos_lock){+.+.+.}, at: [<000000004f12b232>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2021: #0: (&tty->ldisc_sem){++++++}, at: [<00000000042f1704>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000231a59a3>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.5/2066: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.3/2067: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/2068: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.1/2069: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.4/2070: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.0/2071: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by kworker/dying/2077: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by udevd/3036: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by udevd/3432: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by kworker/dying/22865: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by kworker/dying/9806: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by kworker/dying/10511: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/17405: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/17410: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.1/17406: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.1/17408: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/17409: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/17411: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/17421: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/17422: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.0/17413: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.0/17414: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.3/17416: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.3/17417: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.4/17420: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000a3e2bc0f>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.177+ #9 ffff8801d98d7cc8 ffffffff81b56f41 0000000000000001 0000000000000000 0000000000000001 ffffffff81099801 dffffc0000000000 ffff8801d98d7d00 ffffffff81b621dc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000868b7086>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000868b7086>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000b0ec1b08>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000006b0cb368>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000093ea3f51>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000008d3d0073>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000008d3d0073>] check_hung_task kernel/hung_task.c:126 [inline] [<000000008d3d0073>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000008d3d0073>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000008b47de3b>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000c2c8f109>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff82817c51