INFO: task kworker/u4:0:5 blocked for more than 140 seconds. Not tainted 4.14.104+ #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. audit: type=1400 audit(1551751710.219:12254): avc: denied { map } for pid=27710 comm="blkid" path="/lib/x86_64-linux-gnu/libc-2.13.so" dev="sda1" ino=2784 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 kworker/u4:0 D26088 5 2 0x80000000 audit: type=1400 audit(1551751710.219:12255): avc: denied { map } for pid=27710 comm="blkid" path="/lib/x86_64-linux-gnu/libc-2.13.so" dev="sda1" ino=2784 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Workqueue: netns cleanup_net audit: type=1400 audit(1551751710.269:12256): avc: denied { map } for pid=27710 comm="blkid" path="/lib/x86_64-linux-gnu/libuuid.so.1.3.0" dev="sda1" ino=2819 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3492 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 cleanup_net+0x136/0x860 net/core/net_namespace.c:449 process_one_work+0x7c6/0x14e0 kernel/workqueue.c:2114 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2248 kthread+0x310/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Showing all locks held in the system: FAT-fs (loop2): Unrecognized mount option "fowner=00000000000000000000" or missing value 3 locks held by kworker/u4:0/5: #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x136/0x860 net/core/net_namespace.c:449 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1746: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.4/11465: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/11489: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/11674: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/11694: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/11713: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/11828: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/11977: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12293: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12409: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12526: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12547: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12564: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/12669: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12713: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12818: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/12914: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12942: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/12956: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/12985: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/12996: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13137: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13623: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13722: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13751: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13784: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13835: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13868: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13955: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/13974: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14264: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14477: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14539: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14559: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14592: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14621: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14782: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14838: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/14946: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15032: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15055: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15135: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15157: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15291: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15417: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15634: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15662: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15817: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15933: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15962: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/15982: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16317: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16345: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16467: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16496: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16613: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16630: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/16744: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16745: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16866: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16893: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16931: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16965: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/16990: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17010: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17115: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17141: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17173: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17219: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/17235: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17326: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17374: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/17556: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17564: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17577: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17604: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/17742: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.104+ #23 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11465 Comm: syz-executor.4 Not tainted 4.14.104+ #23 task: ffff8881764caf00 task.stack: ffff8881765d8000 RIP: 0010:unwind_next_frame+0x3f4/0x1800 arch/x86/kernel/unwind_orc.c:332 RSP: 0018:ffff8881765df400 EFLAGS: 00000282 RAX: ffffffff8a62acdc RBX: 1ffff1102ecbbe87 RCX: ffffffff8a62acdc RDX: ffffffff89201fbb RSI: ffffffff8a62acdc RDI: ffffffff8a3d4570 RBP: 0000000000000001 R08: ffffffff8a62ace2 R09: ffffffff8a62acdc R10: 000000000005f18d R11: 000000000001c033 R12: ffff8881765df505 R13: ffff8881765df508 R14: ffff8881765df4d0 R15: ffff8881765df518 FS: 00007f27f522e700(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d121000 CR3: 00000001c4dc6004 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0x7a/0xf0 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slub.c:2723 [inline] slab_alloc mm/slub.c:2731 [inline] kmem_cache_alloc+0xd2/0x2d0 mm/slub.c:2736 kmem_cache_alloc_node include/linux/slab.h:361 [inline] __alloc_skb+0xd7/0x550 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:980 [inline] kobject_uevent_env+0x571/0xc60 lib/kobject_uevent.c:476 Code: df 49 89 f9 49 c1 e9 03 41 0f b6 14 11 84 d2 74 09 80 fa 03 0f 8e 3f 0e 00 00 8b 90 60 02 00 00 4c 89 c7 e8 4f f5 ff ff 48 89 c1 <48> 85 c9 0f 84 21 02 00 00 4c 8d 41 04 48 b8 00 00 00 00 00 fc