INFO: task syz-executor.5:2121 blocked for more than 140 seconds. Not tainted 4.9.168+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27832 2121 2078 0x00000004 ffff8801d0465f00 0000000000000000 ffff8801db621000 ffffffff83031180 ffff8801db621018 ffff8801d3867680 ffffffff8280028e 0000000000000246 ffff8801d0465f00 0000000000000000 ffff8801db6218f0 1ffff1003a70cebf Call Trace: [<00000000fbd6b8bf>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000bc75801d>] __rt_mutex_slowlock+0x99/0x290 kernel/locking/rtmutex.c:1221 [<0000000040d18a94>] rt_mutex_slowlock+0x199/0x4c0 kernel/locking/rtmutex.c:1293 [<000000005e09478c>] rt_mutex_fastlock kernel/locking/rtmutex.c:1439 [inline] [<000000005e09478c>] rt_mutex_lock+0x2d/0x40 kernel/locking/rtmutex.c:1499 [<000000009c54ea94>] process_notifier drivers/misc/uid_sys_stats.c:636 [inline] [<000000009c54ea94>] process_notifier+0x96/0x670 drivers/misc/uid_sys_stats.c:625 [<000000007e55d0bc>] notifier_call_chain+0xb4/0x1d0 kernel/notifier.c:93 [<000000005b69ae03>] __blocking_notifier_call_chain kernel/notifier.c:317 [inline] [<000000005b69ae03>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] [<000000005b69ae03>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] [<000000005b69ae03>] blocking_notifier_call_chain+0x80/0xa0 kernel/notifier.c:325 [<000000001acc09fc>] profile_task_exit+0x1f/0x30 kernel/profile.c:140 [<000000002995a3e0>] do_exit+0x90/0x2aa0 kernel/exit.c:744 [<000000002c71ee1e>] do_group_exit+0x111/0x300 kernel/exit.c:945 [<000000003d36b628>] get_signal+0x348/0x1aa0 kernel/signal.c:2380 [<000000004ff44464>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:807 [<0000000072188295>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:158 [<000000004cc4f7a1>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] [<000000004cc4f7a1>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline] [<000000004cc4f7a1>] do_syscall_64+0x3f7/0x570 arch/x86/entry/common.c:290 [<0000000072535d65>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 1 lock held by kworker/dying/23: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<00000000345b091d>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [<00000000345b091d>] watchdog+0x13c/0xae0 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [<0000000033a79339>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 2 locks held by getty/2040: #0: (&tty->ldisc_sem){++++++}, at: [<0000000043e9dd2e>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<000000006f70544e>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.5/2121: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.3/2122: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.0/2123: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by kworker/dying/4049: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/4315: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 2 locks held by kworker/u4:12/7160: #0: ("events_unbound"){.+.+.+}, at: [<000000009204988d>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 #1: ((&sub_info->work)){+.+.+.}, at: [<0000000068a457ee>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 1 lock held by kworker/dying/7538: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by kworker/dying/8343: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/21922: #0: (&sig->cred_guard_mutex){+.+.+.}, at: [<000000009f4c82d1>] prepare_bprm_creds+0x55/0x120 fs/exec.c:1369 1 lock held by getty/23967: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23971: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23977: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23978: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23980: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by getty/23981: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.3/24288: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.3/24291: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.3/24306: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.3/24317: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.0/24313: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.0/24314: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.2/24320: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/24328: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/24333: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/24338: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/24341: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by syz-executor.5/24345: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 1 lock held by true/24348: #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:316 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain kernel/notifier.c:328 [inline] #0: ((task_exit_notifier).rwsem){.+.+..}, at: [<0000000063363fc5>] blocking_notifier_call_chain+0x6a/0xa0 kernel/notifier.c:325 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.168+ #39 ffff8801d98d7cc8 ffffffff81b4f5d1 0000000000000000 0000000000000000 0000000000000000 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5a86c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<00000000d13ba055>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000d13ba055>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000dd7ef0da>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000a343ad1a>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000bb65c5f3>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000324519f8>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000324519f8>] check_hung_task kernel/hung_task.c:125 [inline] [<00000000324519f8>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [<00000000324519f8>] watchdog+0x661/0xae0 kernel/hung_task.c:239 [<00000000d2986dba>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000ac55a136>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8280f302