audit: type=1400 audit(1564692318.352:673): avc: denied { write } for pid=16726 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1564692321.042:674): avc: denied { create } for pid=16805 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1564692321.042:675): avc: denied { write } for pid=16805 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 INFO: task init:14112 blocked for more than 140 seconds. Not tainted 4.9.186+ #12 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29128 14112 1 0x00000000 0000000000000087 ffff8801c770df00 ffff8801d0843180 ffff8801db621000 ffff8801d2a32f80 ffff8801db621018 ffff8801d6b5f758 ffffffff8280c55e ffff8801d6b5f698 ffffffff81247eb1 00ff8801d6b5f750 ffff8801db6218f0 Call Trace: [<00000000fc0b4da9>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000a3962944>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<0000000037379e46>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<0000000037379e46>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000000facbe93>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] [<000000000facbe93>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 [<000000008d3c899d>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<0000000080c12f17>] do_dentry_open+0x422/0xd20 fs/open.c:772 [<00000000d34d64f8>] vfs_open+0x105/0x230 fs/open.c:885 [<00000000a2365bea>] do_last fs/namei.c:3457 [inline] [<00000000a2365bea>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<0000000064fdf9b7>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<000000006fd76ff4>] do_sys_open+0x2f0/0x610 fs/open.c:1078 [<000000001f9904b3>] SYSC_open fs/open.c:1096 [inline] [<000000001f9904b3>] SyS_open+0x2d/0x40 fs/open.c:1091 [<00000000f75a5453>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000009f712e9e>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by kworker/u4:0/5: #0: ("events_unbound"){.+.+.+}, at: [<00000000b1fb12fa>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 #1: ((&sub_info->work)){+.+.+.}, at: [<000000000db1751e>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<00000000463780fa>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000463780fa>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<0000000040602d5b>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1892: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000e7276864>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2020: #0: (&tty->ldisc_sem){++++++}, at: [<00000000d5ff5b5d>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<0000000023ed152e>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by kworker/u4:4/2115: #0: ("events_unbound"){.+.+.+}, at: [<00000000b1fb12fa>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 #1: ((&sub_info->work)){+.+.+.}, at: [<000000000db1751e>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 1 lock held by init/14112: #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/14136: #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/14140: #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/14143: #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/14145: #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<000000000facbe93>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by syz-executor.1/16813: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<000000008feb7798>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.186+ #12 ffff8801d98efcc8 ffffffff81b5a0b1 0000000000000001 0000000000000000 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98efd00 ffffffff81b6534c 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000cbeaff1d>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000cbeaff1d>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000fea19eda>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000009abccd18>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<000000009c08392a>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000089533fd4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000089533fd4>] check_hung_task kernel/hung_task.c:126 [inline] [<0000000089533fd4>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<0000000089533fd4>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000005f883ec4>] kthread+0x278/0x310 kernel/kthread.c:211 [<0000000094cd5894>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16808 Comm: syz-executor.1 Not tainted 4.9.186+ #12 task: 00000000e249fab9 task.stack: 0000000028212864 RIP: 0010:[] c [<00000000a2aa0c8e>] trace_lock_acquire include/trace/events/lock.h:12 [inline] RIP: 0010:[] c [<00000000a2aa0c8e>] lock_acquire+0xe0/0x3d0 kernel/locking/lockdep.c:3755 RSP: 0018:ffff8801c954fac8 EFLAGS: 00000047 RAX: 0000000000000000 RBX: 0000000000000046 RCX: 0000000000000000 RDX: ffff8801ab9817c0 RSI: 0000000000000000 RDI: ffff8801ab98206c RBP: ffff8801c954fb30 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff830e0788 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 FS: 0000000002115940(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020323000 CR3: 00000001d5dee000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffff8801ab9820b8c ffff8801ab982068c ffff880100000001c 0000000000000000c ffff8801c954fdd0c ffff8801c954fdd0c ffff8801db61c500c 0000000000000000c 0000000000000093c 00000000000f4240c 000000000000c350c 00000000000f4240c Call Trace: [<00000000d4f51713>] seqcount_lockdep_reader_access include/linux/seqlock.h:80 [inline] [<00000000d4f51713>] read_seqcount_begin include/linux/seqlock.h:163 [inline] [<00000000d4f51713>] ktime_get kernel/time/timekeeping.c:760 [inline] [<00000000d4f51713>] ktime_get+0x6f/0x1c0 kernel/time/timekeeping.c:750 [<000000004bb2e49a>] hrtimer_start_range_ns+0x155/0x1380 kernel/time/hrtimer.c:984 [<00000000b091de44>] hrtimer_start_expires include/linux/hrtimer.h:407 [inline] [<00000000b091de44>] do_nanosleep+0x175/0x4a0 kernel/time/hrtimer.c:1494 [<0000000036eb099d>] hrtimer_nanosleep+0x20e/0x540 kernel/time/hrtimer.c:1566 [<00000000efa80fff>] SYSC_nanosleep kernel/time/hrtimer.c:1604 [inline] [<00000000efa80fff>] SyS_nanosleep+0xcc/0x120 kernel/time/hrtimer.c:1593 [<00000000f75a5453>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000009f712e9e>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c00 c00 cc7 c82 cac c08 c00 c00 c01 c00 c00 c00 c8b c05 cd1 c4c c1d c02 c85 cc0 c0f c8f cfe c00 c00 c00 c65 c8b c05 c8a c5b ce0 c7e c89 cc0 c48 c0f ca3 c05 c88 cf3 c1d c02 c<0f> c82 ca4 c00 c00 c00 cc7 c44 c24 c18 c00 c00 c00 c00 c49 c89 cd9 c4c c89 ce7 c44 c