audit: type=1400 audit(1539401583.176:38834): avc: denied { net_admin } for pid=10248 comm="syz-executor4" capability=12 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 ip6_tunnel: ip6tnl3 xmit: Local address not yet configured! ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! INFO: task init:10668 blocked for more than 140 seconds. Not tainted 4.9.132+ #103 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D28848 10668 1 0x00000000 ffff8801b28d97c0 ffff8801b12ef900 ffff88013f21ac00 ffff8801c89b97c0 ffff8801db621018 ffff8801b3ef7580 ffffffff827f36e2 ffff8801b28da070 000000000000015d 0000000000000000 0000000000000000 ffff8801db6218f0 Call Trace: [] schedule+0x7f/0x1b0 kernel/sched/core.c:3553 [] schedule_timeout+0x735/0xe20 kernel/time/timer.c:1771 [] __down_common kernel/locking/semaphore.c:221 [inline] [] __down+0x191/0x2b0 kernel/locking/semaphore.c:238 [] down+0x5e/0x80 kernel/locking/semaphore.c:61 [] console_lock+0x2c/0x80 kernel/printk/printk.c:2212 [] console_device+0x1c/0xc0 kernel/printk/printk.c:2549 [] tty_lookup_driver drivers/tty/tty_io.c:2003 [inline] [] tty_open_by_driver drivers/tty/tty_io.c:2048 [inline] [] tty_open+0x6f5/0xdf0 drivers/tty/tty_io.c:2125 [] chrdev_open+0x22d/0x5c0 fs/char_dev.c:392 [] do_dentry_open+0x3ef/0xc90 fs/open.c:766 [] vfs_open+0x11c/0x210 fs/open.c:879 [] do_last fs/namei.c:3410 [inline] [] path_openat+0x542/0x2790 fs/namei.c:3534 [] do_filp_open+0x197/0x270 fs/namei.c:3568 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 [] SYSC_open fs/open.c:1090 [inline] [] SyS_open+0x2d/0x40 fs/open.c:1085 [] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285 [] 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: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1899: #0: (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/2026: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142 1 lock held by init/10668: #0: (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] #0: (tty_mutex){+.+.+.}, at: [] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125 1 lock held by init/10669: #0: (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] #0: (tty_mutex){+.+.+.}, at: [] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125 1 lock held by init/10670: #0: (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] #0: (tty_mutex){+.+.+.}, at: [] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125 1 lock held by init/10671: #0: (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] #0: (tty_mutex){+.+.+.}, at: [] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125 1 lock held by init/10672: #0: (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] #0: (tty_mutex){+.+.+.}, at: [] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125 1 lock held by init/10675: #0: (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] #0: (tty_mutex){+.+.+.}, at: [] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125 1 lock held by syz-executor2/10823: #0: (tty_mutex){+.+.+.}, at: [] ptmx_open+0xf7/0x310 drivers/tty/pty.c:753 1 lock held by syz-executor2/10825: #0: (tty_mutex){+.+.+.}, at: [] ptmx_open+0xf7/0x310 drivers/tty/pty.c:753 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.132+ #103 ffff8801d9907d08 ffffffff81b371b9 0000000000000000 0000000000000001 0000000000000001 0000000000000001 ffffffff810984f0 ffff8801d9907d40 ffffffff81b422c9 0000000000000001 0000000000000000 0000000000000004 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99 [] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6ad/0xa20 kernel/hung_task.c:239 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] 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 CPU: 0 PID: 9776 Comm: syz-executor0 Not tainted 4.9.132+ #103 task: ffff8801cefc2f80 task.stack: ffff8801d5e30000 RIP: 0033:[<00000000004015bb>] c [<00000000004015bb>] 0x4015bb RSP: 002b:00007fba8eb8ab50 EFLAGS: 00000216 RAX: 000000007f5e1800 RBX: 0000000000000ff4 RCX: 0000000000457569 RDX: 0000000000410f61 RSI: 0000000000a44bf0 RDI: 0000000000000043 RBP: 00000000004bc231 R08: 000000000000000e R09: 0000000000000000 R10: 00007fba8eb8b700 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000004c3023 R14: 00000000004d50d0 R15: 00000000ffffffff FS: 00007fba8eb8b700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c424b49000 CR3: 00000001c65f8000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400