INFO: task kworker/0:0:5 blocked for more than 143 seconds. Not tainted 5.3.0-rc8+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:0 D27096 5 2 0x80004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4006 __mutex_lock_common kernel/locking/mutex.c:1007 [inline] __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1077 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1092 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 linkwatch_event+0xf/0x70 net/core/link_watch.c:242 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task kworker/u4:2:29 blocked for more than 143 seconds. Not tainted 5.3.0-rc8+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:2 D24280 29 2 0x80004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 exp_funnel_lock kernel/rcu/tree_exp.h:308 [inline] synchronize_rcu_expedited+0x544/0x5b0 kernel/rcu/tree_exp.h:816 synchronize_net+0x3b/0x60 net/core/dev.c:9266 rollback_registered_many+0x57a/0xdd0 net/core/dev.c:8188 unregister_netdevice_many.part.0+0x1b/0x1f0 net/core/dev.c:9311 unregister_netdevice_many+0x3b/0x50 net/core/dev.c:9310 ip_tunnel_delete_nets+0x41e/0x5f0 net/ipv4/ip_tunnel.c:1113 vti_exit_batch_net+0x23/0x30 net/ipv4/ip_vti.c:474 ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:175 cleanup_net+0x4e2/0xa60 net/core/net_namespace.c:594 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task syz-executor.5:21245 blocked for more than 143 seconds. Not tainted 5.3.0-rc8+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28304 21245 9687 0x00000004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 exp_funnel_lock kernel/rcu/tree_exp.h:308 [inline] synchronize_rcu_expedited+0x544/0x5b0 kernel/rcu/tree_exp.h:816 synchronize_net+0x3b/0x60 net/core/dev.c:9266 packet_set_ring+0x23c/0x1b60 net/packet/af_packet.c:4377 packet_setsockopt+0x530/0x2df0 net/packet/af_packet.c:3689 __sys_setsockopt+0x261/0x4c0 net/socket.c:2084 __do_sys_setsockopt net/socket.c:2100 [inline] __se_sys_setsockopt net/socket.c:2097 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598e9 Code: Bad RIP value. RSP: 002b:00007f2a434fcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004598e9 RDX: 000000000000000d RSI: 0000000000000107 RDI: 0000000000000008 RBP: 000000000075bfc8 R08: 000000000000fd91 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 00007f2a434fd6d4 R13: 00000000004c82e9 R14: 00000000004decd0 R15: 00000000ffffffff INFO: task syz-executor.1:21249 blocked for more than 144 seconds. Not tainted 5.3.0-rc8+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25960 21249 9674 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4006 __mutex_lock_common kernel/locking/mutex.c:1007 [inline] __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1077 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1092 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 ip_tunnel_init_net+0x363/0x9e0 net/ipv4/ip_tunnel.c:1059 vti_init_net+0x2f/0x370 net/ipv4/ip_vti.c:463 ops_init+0xb3/0x420 net/core/net_namespace.c:137 setup_net+0x2cc/0x880 net/core/net_namespace.c:334 copy_net_ns+0x290/0x41f net/core/net_namespace.c:475 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:103 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:202 ksys_unshare+0x444/0x980 kernel/fork.c:2841 __do_sys_unshare kernel/fork.c:2909 [inline] __se_sys_unshare kernel/fork.c:2907 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2907 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598e9 Code: Bad RIP value. RSP: 002b:00007f1a02035c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00000000004598e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1a020366d4 R13: 00000000004c9090 R14: 00000000004e0290 R15: 00000000ffffffff INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc8+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x9d0/0xef0 kernel/hung_task.c:289 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60