audit: type=1400 audit(2000000269.109:153): avc: denied { ioctl } for pid=11270 comm="syz-executor.5" path="socket:[146998]" dev="sockfs" ino=146998 ioctlcmd=0x5411 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:usbtty_device_t:s0 tclass=sock_file permissive=1 IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready INFO: task syz-executor.2:2224 blocked for more than 140 seconds. Not tainted 4.9.186+ #10 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28984 2224 29072 0x00000000 0000000000000083 ffff8801ab0d2f80 0000000000000000 ffff8801db621000 ffffffff83031180 ffff8801db621018 ffff8801aca8f6b0 ffffffff8280c5ee ffffffff815673fa ffff8801d7676a48 00ff8801aca8f600 ffff8801db6218f0 Call Trace: [<00000000aa38cb23>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<000000004d6486bb>] d_wait_lookup fs/dcache.c:2449 [inline] [<000000004d6486bb>] d_alloc_parallel+0x10af/0x1720 fs/dcache.c:2531 [<0000000092660b77>] lookup_slow+0x1b0/0x480 fs/namei.c:1691 [<00000000d3e20215>] walk_component+0x71e/0xce0 fs/namei.c:1825 [<00000000ae660aff>] lookup_last fs/namei.c:2307 [inline] [<00000000ae660aff>] path_lookupat.isra.0+0x18f/0x3f0 fs/namei.c:2324 [<00000000ac32c149>] filename_lookup+0x1a1/0x3b0 fs/namei.c:2358 [<00000000e091193f>] user_path_at_empty+0x43/0x50 fs/namei.c:2619 [<00000000df21c4e9>] user_path_at include/linux/namei.h:55 [inline] [<00000000df21c4e9>] vfs_fstatat+0xc6/0x170 fs/stat.c:106 [<00000000ac5606e8>] vfs_lstat fs/stat.c:129 [inline] [<00000000ac5606e8>] SYSC_newlstat fs/stat.c:283 [inline] [<00000000ac5606e8>] SyS_newlstat+0x97/0x110 fs/stat.c:277 [<00000000b6e7032a>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000d41cacc5>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 3 locks held by kworker/u4:0/5: #0: ("%s""netns"){.+.+.+}, at: [<00000000b2174aa3>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 #1: (net_cleanup_work){+.+.+.}, at: [<00000000649e3e4c>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 #2: (net_mutex){+.+.+.}, at: [<00000000594b3b65>] cleanup_net+0x131/0x8a0 net/core/net_namespace.c:440 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<0000000084373f62>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<0000000084373f62>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<0000000032ef5479>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 2 locks held by getty/2033: #0: (&tty->ldisc_sem){++++++}, at: [<00000000f741fc99>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000058d4e0a8>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.2/2202: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<0000000043370c20>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<0000000043370c20>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<000000003df44e46>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 1 lock held by syz-executor.2/2224: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<0000000043370c20>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<0000000043370c20>] lookup_slow+0x160/0x480 fs/namei.c:1686 1 lock held by syz-executor.5/11323: #0: (net_mutex){+.+.+.}, at: [<00000000b1885128>] copy_net_ns+0x15b/0x340 net/core/net_namespace.c:407 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.186+ #10 ffff8801d98d7cc8 ffffffff81b5a0b1 0000000000000001 0000000000000000 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6534c 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000fc8998c5>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000fc8998c5>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<0000000072c8c26e>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000c2cb3e05>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000d7ec94ff>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000009c4eb60c>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000009c4eb60c>] check_hung_task kernel/hung_task.c:126 [inline] [<000000009c4eb60c>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000009c4eb60c>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000d13024fb>] kthread+0x278/0x310 kernel/kthread.c:211 [<0000000093a9ccdc>] 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: 353 Comm: kworker/0:1H Not tainted 4.9.186+ #10 Workqueue: kblockd blk_mq_run_work_fnc task: 000000004aa38474 task.stack: 00000000682a020f RIP: 0010:[] c [<00000000cda35762>] blk_mq_run_work_fn+0x1/0x20 block/blk-mq.c:990 RSP: 0018:ffff8801d53b7bd8 EFLAGS: 00000246 RAX: ffffffff81b18090 RBX: ffff8801db620b40 RCX: ffff8801d53a88b0 RDX: 1ffff1003aa3baa3 RSI: ffffffff811324b0 RDI: ffff8801abdbf200 RBP: ffff8801d53b7cf8 R08: 0000000000000001 R09: 000000000000357d R10: ffff8801d53a88d8 R11: 0000000000000001 R12: ffff8801abdbf200 R13: ffff8801d53b7c70 R14: ffff8801db620b40 R15: ffff8801d51dd500 FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2bf26000 CR3: 00000001ac66c000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffff8801d53b7cf8c ffffffff811324dbc ffffffff8113241ec ffff8801d51dd548c ffff8801d981a000c ffffffff00000000c ffff8801d51dd510c ffff8801d51dd520c ffff8801d51dd508c 1ffff1003aa76f8ac 00000000e63c4e77c ffff8801db626e08c Call Trace: [<000000005e6b8d02>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251 [<00000000d13024fb>] kthread+0x278/0x310 kernel/kthread.c:211 [<0000000093a9ccdc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Code: c8d c80 cff c4c c8d ca3 c88 cfe cff cff c4c c89 ce7 ce8 c18 cf0 cff cff ce8 c33 c8d c80 cff c5b c41 c5c c5d cc3 c0f c1f c40 c00 c66 c2e c0f c1f c84 c00 c00 c00 c00 c00 c55 c<48> c89 ce5 c53 c48 c89 cfb ce8 c13 c8d c80 cff c48 c8d c7b c80 ce8 cea cef cff cff c