audit: type=1800 audit(1591039452.386:262): pid=1703 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="sda1" ino=16377 res=0 audit: type=1800 audit(1591039452.536:263): pid=1708 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="sda1" ino=16370 res=0 INFO: task kworker/0:1:24 blocked for more than 140 seconds. Not tainted 4.14.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:1 D25520 24 2 0x80000000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 linkwatch_event+0xa/0x50 net/core/link_watch.c:236 process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task systemd-udevd:3641 blocked for more than 140 seconds. Not tainted 4.14.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D26320 3641 1 0x00000100 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 blkdev_get+0x84/0x8a0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0xb68/0x2aa0 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x292/0x3e0 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f63fba2b840 RSP: 002b:00007fff260561f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff26056290 RCX: 00007f63fba2b840 RDX: 0000563f7aaeafe3 RSI: 00000000000a0800 RDI: 0000563f7b305380 RBP: 00007fff26056700 R08: 0000563f7aaea670 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff260563a0 R13: 0000563f7b253a60 R14: 0000563f7b3067f0 R15: 00007fff26056270 INFO: task syz-executor.1:18641 blocked for more than 140 seconds. Not tainted 4.14.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28336 18641 6355 0x80000002 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459 loop_clr_fd+0x49e/0xac0 drivers/block/loop.c:1069 __lo_release drivers/block/loop.c:1660 [inline] lo_release+0xff/0x190 drivers/block/loop.c:1678 __blkdev_put+0x4ec/0x6a0 fs/block_dev.c:1791 blkdev_close+0x86/0xb0 fs/block_dev.c:1863 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9fb/0x2ae0 kernel/exit.c:858 do_group_exit+0x100/0x2e0 kernel/exit.c:955 get_signal+0x385/0x1c90 kernel/signal.c:2423 do_signal+0x7c/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45ca69 RSP: 002b:00007f9e7cf44cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078c188 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078c188 RBP: 000000000078c180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c18c R13: 00007fff9587591f R14: 00007f9e7cf459c0 R15: 000000000078c18c INFO: task syz-executor.1:717 blocked for more than 140 seconds. Not tainted 4.14.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27088 717 6355 0x80000002 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459 kobject_cleanup lib/kobject.c:633 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put+0x178/0x1f0 lib/kobject.c:692 net_rx_queue_update_kobjects+0x2df/0x3e0 net/core/net-sysfs.c:967 remove_queue_kobjects net/core/net-sysfs.c:1431 [inline] netdev_unregister_kobject+0x138/0x1d0 net/core/net-sysfs.c:1570 rollback_registered_many+0x620/0xa70 net/core/dev.c:7230 rollback_registered+0xd6/0x180 net/core/dev.c:7248 unregister_netdevice_queue net/core/dev.c:8262 [inline] unregister_netdevice_queue+0x1a1/0x220 net/core/dev.c:8255 unregister_netdevice include/linux/netdevice.h:2442 [inline] __tun_detach+0xaa2/0xcf0 drivers/net/tun.c:576 tun_detach drivers/net/tun.c:586 [inline] tun_chr_close+0x41/0x60 drivers/net/tun.c:2671 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9fb/0x2ae0 kernel/exit.c:858 do_group_exit+0x100/0x2e0 kernel/exit.c:955 get_signal+0x385/0x1c90 kernel/signal.c:2423 do_signal+0x7c/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45ca69 RSP: 002b:00007f9e7cf65c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000116 RAX: fffffffffffffe00 RBX: 000000000050a3c0 RCX: 000000000045ca69 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 000000000078c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c55 R14: 00000000004cea35 R15: 00007f9e7cf666d4 Showing all locks held in the system: 3 locks held by kworker/0:1/24: #0: ("events"){+.+.}, at: [] process_one_work+0x6d8/0x14c0 kernel/workqueue.c:2087 #1: ((linkwatch_work).work){+.+.}, at: [] process_one_work+0x70e/0x14c0 kernel/workqueue.c:2091 #2: (rtnl_mutex){+.+.}, at: [] linkwatch_event+0xa/0x50 net/core/link_watch.c:236 1 lock held by khungtaskd/1049: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by systemd-udevd/3641: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 2 locks held by agetty/6262: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16e0 drivers/tty/n_tty.c:2156 4 locks held by syz-executor.1/18641: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0x9e/0x6a0 fs/block_dev.c:1778 #1: (loop_index_mutex){+.+.}, at: [] lo_release+0x1b/0x190 drivers/block/loop.c:1677 #2: (&lo->lo_ctl_mutex){+.+.}, at: [] __lo_release drivers/block/loop.c:1654 [inline] #2: (&lo->lo_ctl_mutex){+.+.}, at: [] lo_release+0x7f/0x190 drivers/block/loop.c:1678 #3: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459 3 locks held by kworker/0:2/31338: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] process_one_work+0x6d8/0x14c0 kernel/workqueue.c:2087 #1: ((addr_chk_work).work){+.+.}, at: [] process_one_work+0x70e/0x14c0 kernel/workqueue.c:2091 #2: (rtnl_mutex){+.+.}, at: [] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4412 2 locks held by syz-executor.1/717: #0: (rtnl_mutex){+.+.}, at: [] tun_detach drivers/net/tun.c:585 [inline] #0: (rtnl_mutex){+.+.}, at: [] tun_chr_close+0x34/0x60 drivers/net/tun.c:2671 #1: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459 3 locks held by kworker/1:4/1733: #0: ("events"){+.+.}, at: [] process_one_work+0x6d8/0x14c0 kernel/workqueue.c:2087 #1: (deferred_process_work){+.+.}, at: [] process_one_work+0x70e/0x14c0 kernel/workqueue.c:2091 #2: (rtnl_mutex){+.+.}, at: [] switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150 =============================================