INFO: task kworker/0:0:10789 blocked for more than 143 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:0 D26512 10789 2 0x80004000 Workqueue: events nsim_dev_trap_report_work Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4227 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 nsim_dev_trap_report_work+0x5d/0xbc0 drivers/net/netdevsim/dev.c:585 process_one_work+0x965/0x16a0 kernel/workqueue.c:2266 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task kworker/u4:1:14489 blocked for more than 144 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:1 D24792 14489 2 0x80004000 Workqueue: netns cleanup_net Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4227 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 devlink_pernet_pre_exit+0x1c/0x190 net/core/devlink.c:9229 ops_pre_exit_list net/core/net_namespace.c:176 [inline] cleanup_net+0x47a/0xa50 net/core/net_namespace.c:591 process_one_work+0x965/0x16a0 kernel/workqueue.c:2266 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task syz-executor.3:19389 blocked for more than 144 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28416 19389 7263 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4227 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x763/0xdf0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c889 Code: Bad RIP value. RSP: 002b:00007f13f78acc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f13f78ad6d4 RCX: 000000000045c889 RDX: 0000000000000000 RSI: 0000000020000800 RDI: 0000000000000006 RBP: 000000000076c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000903 R14: 00000000004cbad0 R15: 000000000076c0ec INFO: task syz-executor.3:19390 blocked for more than 145 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28416 19390 7263 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4227 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x763/0xdf0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x416541 Code: Bad RIP value. RSP: 002b:00007f13f788b9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f13f788ba58 RCX: 0000000000416541 RDX: 0000000000000000 RSI: 00007f13f788ba00 RDI: 0000000000000007 RBP: 0000000000000007 R08: 0000000000000008 R09: 0000000000000000 R10: 00007f13f788c9d0 R11: 0000000000000293 R12: 00007f13f788ba40 R13: 0000000000000bb6 R14: 00000000004d7ee8 R15: 000000000076c18c INFO: task syz-executor.5:19408 blocked for more than 147 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28216 19408 7513 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4227 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x763/0xdf0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x416541 Code: Bad RIP value. RSP: 002b:00007f213d2019c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f213d201a58 RCX: 0000000000416541 RDX: 0000000000000000 RSI: 00007f213d201a00 RDI: 0000000000000006 RBP: 0000000000000006 R08: 0000000000000009 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f213d201a40 R13: 0000000000000bbd R14: 00000000004d7fe8 R15: 000000000076bf0c Showing all locks held in the system: 1 lock held by khungtaskd/1138: #0: ffffffff899bbbc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5743 1 lock held by in:imklog/6706: #0: ffff8880a3bec8b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 3 locks held by kworker/u4:6/8880: 3 locks held by kworker/1:27/10547: #0: ffff8882150ac538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8882150ac538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8882150ac538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8882150ac538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8882150ac538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8882150ac538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8882150ac538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2237 #1: ffffc90001977dc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2241 #2: ffffffff8a576128 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xa9/0x1280 net/ipv6/addrconf.c:4043 5 locks held by kworker/1:0/29366: 3 locks held by kworker/0:0/10789: #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2237 #1: ffffc900016c7dc0 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2241 #2: ffff88809c152370 (&nsim_dev->port_list_lock#2){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x5d/0xbc0 drivers/net/netdevsim/dev.c:585 4 locks held by kworker/u4:1/14489: #0: ffff8880a9775938 ((wq_completion)netns){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880a9775938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880a9775938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880a9775938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880a9775938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880a9775938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880a9775938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2237 #1: ffffc90001777dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2241 #2: ffffffff8a56a230 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 net/core/net_namespace.c:565 #3: ffffffff8a5965e8 (devlink_mutex){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x1c/0x190 net/core/devlink.c:9229 6 locks held by syz-executor.3/19379: #0: ffffffff8a5cd510 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:745 #1: ffffffff8a5cd5c8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff8a5cd5c8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x763/0xdf0 net/netlink/genetlink.c:733 #2: ffffffff8a5965e8 (devlink_mutex){+.+.}-{3:3}, at: devlink_nl_pre_doit+0x27/0x6c0 net/core/devlink.c:401 #3: ffff88809c152370 (&nsim_dev->port_list_lock#2){+.+.}-{3:3}, at: nsim_dev_port_del_all+0x28/0xe0 drivers/net/netdevsim/dev.c:944 #4: ffffffff8a576128 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x2b/0x60 drivers/net/netdevsim/netdev.c:329 #5: ffffffff899bfc20 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #5: ffffffff899bfc20 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x501/0x620 kernel/rcu/tree_exp.h:856 2 locks held by syz-executor.3/19389: #0: ffffffff8a5cd510 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:745 #1: ffffffff8a5cd5c8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff8a5cd5c8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x763/0xdf0 net/netlink/genetlink.c:733 2 locks held by syz-executor.3/19390: #0: ffffffff8a5cd510 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:745 #1: ffffffff8a5cd5c8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff8a5cd5c8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x763/0xdf0 net/netlink/genetlink.c:733 2 locks held by syz-executor.5/19408: #0: ffffffff8a5cd510 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:745 #1: ffffffff8a5cd5c8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff8a5cd5c8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x763/0xdf0 net/netlink/genetlink.c:733 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1138 Comm: khungtaskd Not tainted 5.6.0-syzkaller #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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 29366 Comm: kworker/1:0 Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events ipvlan_process_multicast RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:754 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:776 [inline] RIP: 0010:lock_is_held_type+0x84/0x350 kernel/locking/lockdep.c:4956 Code: 02 00 00 48 c7 c0 d8 92 94 89 48 b9 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 08 00 0f 85 c3 02 00 00 48 83 3d 94 e9 3b 08 00 <0f> 84 ff 01 00 00 9c 58 0f 1f 44 00 00 48 b9 00 00 00 00 00 fc ff RSP: 0018:ffffc90000da8478 EFLAGS: 00000282 RAX: 1ffffffff132925b RBX: ffff88808fdb45c0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88808fdb4e84 RBP: ffffc90000da85a8 R08: ffff88808fdb45c0 R09: ffffed1015ce7104 R10: ffff8880ae73881b R11: ffffed1015ce7103 R12: ffff8880975218af R13: 0000000000000001 R14: ffff8880975218a0 R15: ffffffff899bbbc0 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f533bd45000 CR3: 000000009a2df000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:406 [inline] rcu_read_lock_held kernel/rcu/update.c:307 [inline] rcu_read_lock_held+0x9c/0xb0 kernel/rcu/update.c:301 __in6_dev_get include/net/addrconf.h:312 [inline] ip6_ignore_linkdown include/net/addrconf.h:403 [inline] find_match+0x2f3/0xc90 net/ipv6/route.c:749 __find_rr_leaf+0x136/0x690 net/ipv6/route.c:837 find_rr_leaf net/ipv6/route.c:858 [inline] rt6_select net/ipv6/route.c:902 [inline] fib6_table_lookup+0x629/0xcc0 net/ipv6/route.c:2167 ip6_pol_route+0x1c9/0x950 net/ipv6/route.c:2203 fib6_rule_lookup+0x112/0x750 net/ipv6/fib6_rules.c:114 ip6_route_input+0x5f0/0xa40 net/ipv6/route.c:2442 ip6_rcv_finish_core.isra.0+0x168/0x580 net/ipv6/ip6_input.c:63 ip6_rcv_finish+0x176/0x310 net/ipv6/ip6_input.c:74 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0xf8/0x3f0 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core+0xf5/0x160 net/core/dev.c:5187 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5301 process_backlog+0x21e/0x7a0 net/core/dev.c:6133 napi_poll net/core/dev.c:6571 [inline] net_rx_action+0x4c2/0x1070 net/core/dev.c:6639 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.0+0x10f/0x160 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x20e/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] ipvlan_process_multicast+0x7e6/0xca0 drivers/net/ipvlan/ipvlan_core.c:279 process_one_work+0x965/0x16a0 kernel/workqueue.c:2266 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352