NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.2:17537 blocked for more than 140 seconds. Not tainted 4.14.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D26928 17537 6368 0x80000006 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x946/0xe40 kernel/time/timer.c:1723 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common kernel/sched/completion.c:123 [inline] wait_for_completion+0x241/0x390 kernel/sched/completion.c:144 _rcu_barrier+0x285/0x400 kernel/rcu/tree.c:3611 netdev_run_todo+0xed/0x710 net/core/dev.c:7912 tun_detach drivers/net/tun.c:587 [inline] tun_chr_close+0x46/0x60 drivers/net/tun.c:2671 __fput+0x25f/0x790 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+0x9f2/0x2b00 kernel/exit.c:858 do_group_exit+0x100/0x310 kernel/exit.c:955 get_signal+0x385/0x1ca0 kernel/signal.c:2423 do_signal+0x7c/0x1690 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x159/0x220 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+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007f0beb010c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffff2 RBX: 00007f0beb0116d4 RCX: 000000000045c889 RDX: 0000000020000100 RSI: 00000000000089a0 RDI: 0000000000000003 RBP: 000000000076c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006b0 R14: 00000000004c96f6 R15: 000000000076c04c INFO: task syz-executor.3:17542 blocked for more than 140 seconds. Not tainted 4.14.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27568 17542 6372 0x00000004 Call Trace: 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+0x73c/0x1470 kernel/locking/mutex.c:893 sock_ioctl+0x239/0x450 net/socket.c:1036 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007fc9b2e14c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc9b2e156d4 RCX: 000000000045c889 RDX: 0000000020000100 RSI: 00000000000089a0 RDI: 0000000000000003 RBP: 000000000076c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006b0 R14: 00000000004c96f6 R15: 000000000076c04c INFO: task syz-executor.5:17578 blocked for more than 140 seconds. Not tainted 4.14.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D30624 17578 6371 0x00000004 Call Trace: 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+0x73c/0x1470 kernel/locking/mutex.c:893 sock_ioctl+0x239/0x450 net/socket.c:1036 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007ff558482c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff5584836d4 RCX: 000000000045c889 RDX: 0000000020000100 RSI: 00000000000089a0 RDI: 0000000000000004 RBP: 000000000076c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006b0 R14: 00000000004c96f6 R15: 000000000076c04c INFO: task syz-executor.1:17612 blocked for more than 140 seconds. Not tainted 4.14.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29280 17612 6369 0x00000004 Call Trace: 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+0x73c/0x1470 kernel/locking/mutex.c:893 sock_ioctl+0x239/0x450 net/socket.c:1036 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007f263e8f2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f263e8f36d4 RCX: 000000000045c889 RDX: 00000000200000c0 RSI: 00000000000089a1 RDI: 0000000000000004 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006b3 R14: 00000000004c9749 R15: 000000000076bf0c INFO: task syz-executor.1:17613 blocked for more than 140 seconds. Not tainted 4.14.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D30624 17613 6369 0x00000004 Call Trace: 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+0x73c/0x1470 kernel/locking/mutex.c:893 sock_ioctl+0x239/0x450 net/socket.c:1036 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007f263e8d1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f263e8d26d4 RCX: 000000000045c889 RDX: 0000000020000100 RSI: 00000000000089a0 RDI: 0000000000000004 RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006b0 R14: 00000000004c96f6 R15: 000000000076bfac Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 3 locks held by kworker/u4:5/3268: #0: ("%s""netns"){+.+.}, at: [] work_static include/linux/workqueue.h:199 [inline] #0: ("%s""netns"){+.+.}, at: [] set_work_data kernel/workqueue.c:619 [inline] #0: ("%s""netns"){+.+.}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x727/0x1540 kernel/workqueue.c:2087 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x761/0x1540 kernel/workqueue.c:2091 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x123/0x820 net/core/net_namespace.c:450 2 locks held by syz-executor.4/17558: #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: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:145 [inline] #1: (cpu_hotplug_lock.rw_sem){++++}, at: [] flush_all_backlogs net/core/dev.c:4653 [inline] #1: (cpu_hotplug_lock.rw_sem){++++}, at: [] rollback_registered_many+0x3f4/0xa70 net/core/dev.c:7191 1 lock held by syz-executor.2/17537: #0: (rcu_preempt_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x56/0x400 kernel/rcu/tree.c:3546 1 lock held by syz-executor.3/17542: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x450 net/socket.c:1036 2 locks held by syz-executor.5/17560: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x450 net/socket.c:1036 #1: (rcu_preempt_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x56/0x400 kernel/rcu/tree.c:3546 1 lock held by syz-executor.5/17578: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x450 net/socket.c:1036 1 lock held by syz-executor.1/17612: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x450 net/socket.c:1036 1 lock held by syz-executor.1/17613: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x450 net/socket.c:1036 3 locks held by kworker/0:1/17625: #0: ("events"){+.+.}, at: [] work_static include/linux/workqueue.h:199 [inline] #0: ("events"){+.+.}, at: [] set_work_data kernel/workqueue.c:619 [inline] #0: ("events"){+.+.}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ("events"){+.+.}, at: [] process_one_work+0x727/0x1540 kernel/workqueue.c:2087 #1: ((linkwatch_work).work){+.+.}, at: [] process_one_work+0x761/0x1540 kernel/workqueue.c:2091 #2: (rtnl_mutex){+.+.}, at: [] linkwatch_event+0xa/0x50 net/core/link_watch.c:236 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 4.14.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e2/0xb80 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16004 Comm: syz-executor.0 Not tainted 4.14.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88808bca6000 task.stack: ffff888049730000 RIP: 0010:lock_acquire+0xc/0x3f0 kernel/locking/lockdep.c:3983 RSP: 0000:ffff888049737b40 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 1ffff110092e6f76 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88808bca67d8 RBP: ffff88808bca67c0 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88808bca68a8 R11: ffff88808bca6000 R12: 0000000000000082 R13: ffff88808bca67c0 R14: dffffc0000000000 R15: ffff88808bca6010 FS: 00007f61d2f76700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000003affdcb8 CR3: 000000008c24e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:160 try_to_wake_up+0x6a/0xef0 kernel/sched/core.c:1997 signal_wake_up_state+0x1e/0x40 kernel/signal.c:685 signal_wake_up include/linux/sched/signal.h:351 [inline] complete_signal+0x2e3/0x660 kernel/signal.c:1020 __send_signal+0x688/0x1280 kernel/signal.c:1147 specific_send_sig_info kernel/signal.c:1208 [inline] force_sig_info+0x240/0x340 kernel/signal.c:1260 force_sig_info_fault.constprop.0+0x185/0x260 arch/x86/mm/fault.c:225 __bad_area_nosemaphore+0x1d9/0x2a0 arch/x86/mm/fault.c:940 __do_page_fault+0x859/0xb40 arch/x86/mm/fault.c:1412 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1122 RIP: 0bed:0x4ce150 RSP: d2f766d4:000000000076c0e0 EFLAGS: ffffffff Code: ff 48 c7 c7 00 1a 66 8a e8 82 62 3d 00 e9 7b fe ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 57 <41> 89 cf 41 56 45 89 c6 41 55 41 89 d5 41 54 41 89 f4 55 48 89