INFO: task udevd:587 blocked for more than 140 seconds. Not tainted 4.9.169+ #44 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. udevd D28024 587 470 0x00000000 ffff8801d07e5f00 ffff8801cf8bee00 ffff8801db621000 ffff8801d07e4740 ffff8801db621018 ffff8801cf9df990 ffffffff8280152e 0000000000000246 ffff8801d07e5f00 0000000000000000 ffff8801db6218f0 1ffff10039f3bf21 Call Trace: [<0000000053d5ee20>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000075536ae>] __rt_mutex_slowlock+0x99/0x290 kernel/locking/rtmutex.c:1221 [<0000000082579464>] rt_mutex_slowlock+0x199/0x4c0 kernel/locking/rtmutex.c:1293 [<00000000db19fb0e>] rt_mutex_fastlock kernel/locking/rtmutex.c:1439 [inline] [<00000000db19fb0e>] rt_mutex_lock+0x2d/0x40 kernel/locking/rtmutex.c:1499 [<000000007d90ed24>] process_notifier drivers/misc/uid_sys_stats.c:636 [inline] [<000000007d90ed24>] process_notifier+0x96/0x670 drivers/misc/uid_sys_stats.c:625 [<0000000078ebfbb4>] notifier_call_chain+0xb4/0x1d0 kernel/notifier.c:93 [<000000004a9053ff>] __blocking_notifier_call_chain kernel/notifier.c:317 [inline] [<000000004a9053ff>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] [<000000004a9053ff>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] [<000000004a9053ff>] blocking_notifier_call_chain+0x80/0xa0 kernel/notifier.c:325 [<000000008c7733b9>] profile_task_exit+0x1f/0x30 kernel/profile.c:140 [<0000000082902e8e>] do_exit+0x90/0x2aa0 kernel/exit.c:744 [<00000000ceabf7b8>] do_group_exit+0x111/0x300 kernel/exit.c:945 [<0000000051e4ddc6>] SYSC_exit_group kernel/exit.c:956 [inline] [<0000000051e4ddc6>] SyS_exit_group+0x1d/0x20 kernel/exit.c:954 [<000000001f620346>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 [<000000009dee7616>] 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: [<00000000c56b0e12>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [<00000000c56b0e12>] watchdog+0x13c/0xae0 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [<0000000096f1e851>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 1 lock held by udevd/587: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by udevd/588: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by rsyslogd/1899: #0: (&f->f_pos_lock){+.+.+.}, at: [<0000000097e821a9>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2026: #0: (&tty->ldisc_sem){++++++}, at: [<00000000cbfead85>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<000000001b7bdf35>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/2110: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/2111: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.1/2112: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.4/2113: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/2114: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by udevd/3006: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by kworker/dying/15863: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23474: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23484: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23493: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23508: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23515: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23519: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.0/23831: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.4/23840: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.4/23846: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.1/23854: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.1/23856: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.1/23868: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/23858: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/23859: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/23878: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/23873: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/23874: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/23880: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/23876: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<00000000f5e5a781>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.169+ #44 ffff8801d98d7cc8 ffffffff81b4f7f1 0000000000000001 0000000000000000 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5aa8c 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000d9fb1f20>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000d9fb1f20>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000c71358ec>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000bfd5ced4>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000055e92872>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000008bae09dd>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000008bae09dd>] check_hung_task kernel/hung_task.c:125 [inline] [<000000008bae09dd>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [<000000008bae09dd>] watchdog+0x661/0xae0 kernel/hung_task.c:239 [<000000006d256464>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000e72f6eb4>] 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 0xffffffff828105a2