INFO: task kworker/u4:3:14025 blocked for more than 140 seconds. Not tainted 4.14.110+ #49 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:3 D26536 14025 2 0x80000000 Workqueue: netns cleanup_net Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __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+0x7c6/0x1510 kernel/workqueue.c:2134 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2271 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: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [<0000000011472cb4>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 1 lock held by rsyslogd/1629: #0: (&f->f_pos_lock){+.+.}, at: [<00000000526dfd7f>] __fdget_pos+0xa6/0xc0 fs/file.c:768 2 locks held by getty/1757: #0: (&tty->ldisc_sem){++++}, at: [<00000000ec7d50fd>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000078d3f094>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/1844: #0: (&bdev->bd_mutex){+.+.}, at: [<0000000041d8b978>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 2 locks held by syz-executor.3/1845: #0: (&bdev->bd_mutex){+.+.}, at: [<0000000041d8b978>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 #1: (loop_index_mutex){+.+.}, at: [<0000000027fd4b8b>] lo_open+0x19/0xb0 drivers/block/loop.c:1624 2 locks held by syz-executor.5/1865: #0: (&bdev->bd_mutex){+.+.}, at: [<0000000087f015bc>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778 #1: (loop_index_mutex){+.+.}, at: [<000000002eddc4ff>] lo_release+0x19/0x190 drivers/block/loop.c:1667 3 locks held by kworker/u4:3/14025: #0: ("%s""netns"){+.+.}, at: [<0000000009ced370>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105 #1: (net_cleanup_work){+.+.}, at: [<00000000c2901073>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109 #2: (net_mutex){+.+.}, at: [<000000000d56d526>] cleanup_net+0x136/0x860 net/core/net_namespace.c:449 1 lock held by syz-executor.4/5842: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/5860: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.0/5886: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/5888: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/5896: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/5928: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/5942: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/5988: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6023: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6055: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6102: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6141: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6190: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6231: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6274: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6311: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6354: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6386: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6454: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6480: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6520: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/6527: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/6538: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6572: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6619: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6657: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/6658: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6712: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6782: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/6833: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/6879: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/6923: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/6929: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7069: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7145: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7191: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7280: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7378: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7479: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7563: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7605: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7651: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7713: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7765: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7821: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/7835: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7908: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/7937: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/7950: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/7961: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/7991: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8015: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/8049: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8069: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/8087: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8102: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/8159: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/8247: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8466: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8495: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8537: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8558: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8618: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8719: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8755: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8780: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/8792: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8812: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8852: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8891: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8922: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/8963: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/9008: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/9132: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/9161: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/9205: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/9236: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.4/9269: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/14305: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/14341: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/14391: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/14397: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/14435: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.1/14505: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.2/14539: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/14547: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by syz-executor.3/14577: #0: (net_mutex){+.+.}, at: [<00000000fd039150>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 1 lock held by blkid/16572: #0: (&bdev->bd_mutex){+.+.}, at: [<0000000041d8b978>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.110+ #49 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16564 Comm: syz-executor.4 Not tainted 4.14.110+ #49 task: 00000000b9f57568 task.stack: 0000000008eec1b2 RIP: 0010:zap_pte_range mm/memory.c:1341 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1444 [inline] RIP: 0010:zap_pud_range mm/memory.c:1473 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1494 [inline] RIP: 0010:unmap_page_range+0x9ff/0x12f0 mm/memory.c:1515 RSP: 0018:ffff888174d1f738 EFLAGS: 00000a06 RAX: 1ffff1102e9a3f06 RBX: 0000000000000000 RCX: ffff888174d1f950 RDX: 0000000000000000 RSI: ffff888174d1f950 RDI: ffff888174d1f830 RBP: 00007f15a0dc2000 R08: 0000000000000001 R09: 0000000000000001 R10: ffff888194036658 R11: 0000000000000001 R12: 00007f15a0dc3000 R13: ffffea00069af240 R14: dffffc0000000000 R15: ffff88819467ee10 FS: 00007f15a0179700(0000) GS:ffff8881db800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcd2488bd8 CR3: 0000000079626005 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unmap_single_vma+0x118/0x170 mm/memory.c:1560 unmap_vmas+0x43/0xa0 mm/memory.c:1590 exit_mmap+0x213/0x440 mm/mmap.c:3067 __mmput kernel/fork.c:929 [inline] mmput kernel/fork.c:950 [inline] mmput+0xc8/0x350 kernel/fork.c:945 exit_mm kernel/exit.c:544 [inline] do_exit+0x84e/0x2960 kernel/exit.c:860 Code: 1b 48 c1 eb 13 c1 e3 1f c1 fb 1f 83 e3 03 e8 59 35 e4 ff 48 8b 44 24 50 48 63 db 48 8d 3c 98 48 89 f8 48 c1 e8 03 42 0f b6 14 30 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3b 07 00 00