INFO: task kworker/0:0:5 blocked for more than 143 seconds. Not tainted 5.8.0-rc6-next-20200720-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:0 D26304 5 2 0x00004000 Workqueue: events nsim_dev_trap_report_work Call Trace: context_switch kernel/sched/core.c:3533 [inline] __schedule+0x908/0x21e0 kernel/sched/core.c:4289 schedule+0xd0/0x2a0 kernel/sched/core.c:4364 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 nsim_dev_trap_report_work+0x5d/0xbe0 drivers/net/netdevsim/dev.c:594 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/u4:1:21 blocked for more than 143 seconds. Not tainted 5.8.0-rc6-next-20200720-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:1 D23664 21 2 0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:3533 [inline] __schedule+0x908/0x21e0 kernel/sched/core.c:4289 schedule+0xd0/0x2a0 kernel/sched/core.c:4364 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 netdev_run_todo+0x705/0xac0 net/core/dev.c:9809 nsim_destroy+0x4a/0x70 drivers/net/netdevsim/netdev.c:342 __nsim_dev_port_del+0x144/0x1e0 drivers/net/netdevsim/dev.c:944 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:957 [inline] nsim_dev_reload_destroy+0xff/0x1e0 drivers/net/netdevsim/dev.c:1133 nsim_dev_reload_down+0x6e/0xd0 drivers/net/netdevsim/dev.c:712 devlink_reload+0xc1/0x3a0 net/core/devlink.c:2952 devlink_pernet_pre_exit+0xfb/0x190 net/core/devlink.c:9626 ops_pre_exit_list net/core/net_namespace.c:176 [inline] cleanup_net+0x451/0xa00 net/core/net_namespace.c:591 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.3:16068 can't die for more than 143 seconds. syz-executor.3 D23296 16068 7125 0x00004006 Call Trace: context_switch kernel/sched/core.c:3533 [inline] __schedule+0x908/0x21e0 kernel/sched/core.c:4289 schedule+0xd0/0x2a0 kernel/sched/core.c:4364 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1884 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x163/0x260 kernel/sched/completion.c:138 __wait_rcu_gp+0x246/0x380 kernel/rcu/update.c:401 synchronize_rcu+0x10a/0x180 kernel/rcu/tree.c:3567 macvlan_hash_del drivers/net/macvlan.c:193 [inline] macvlan_stop+0x3fb/0x4c0 drivers/net/macvlan.c:696 __dev_close_many+0x1b3/0x2e0 net/core/dev.c:1605 __dev_close net/core/dev.c:1617 [inline] __dev_change_flags+0x272/0x660 net/core/dev.c:8287 dev_change_flags+0x8a/0x160 net/core/dev.c:8360 do_setlink+0x87d/0x35c0 net/core/rtnetlink.c:2604 rtnl_group_changelink net/core/rtnetlink.c:3123 [inline] __rtnl_newlink+0xdea/0x1750 net/core/rtnetlink.c:3277 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2362 ___sys_sendmsg+0xf3/0x170 net/socket.c:2416 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2449 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007fd394eb0c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002b5c0 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007fff2341d5bf R14: 00007fd394eb19c0 R15: 000000000078bf0c INFO: task syz-executor.2:16076 blocked for more than 144 seconds. Not tainted 5.8.0-rc6-next-20200720-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28352 16076 1 0x00004004 Call Trace: context_switch kernel/sched/core.c:3533 [inline] __schedule+0x908/0x21e0 kernel/sched/core.c:4289 schedule+0xd0/0x2a0 kernel/sched/core.c:4364 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1994 __do_sys_sendto net/socket.c:2006 [inline] __se_sys_sendto net/socket.c:2002 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2002 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x415eb3 Code: Bad RIP value. RSP: 002b:00007ffe8df61be8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000ca3700 RCX: 0000000000415eb3 RDX: 0000000000000028 RSI: 0000000000ca3750 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe8df61bf0 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000ca3750 R15: 0000000000000003 INFO: task syz-executor.1:16077 blocked for more than 145 seconds. Not tainted 5.8.0-rc6-next-20200720-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28352 16077 1 0x00004004 Call Trace: context_switch kernel/sched/core.c:3533 [inline] __schedule+0x908/0x21e0 kernel/sched/core.c:4289 schedule+0xd0/0x2a0 kernel/sched/core.c:4364 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1994 __do_sys_sendto net/socket.c:2006 [inline] __se_sys_sendto net/socket.c:2002 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2002 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x415eb3 Code: Bad RIP value. RSP: 002b:00007ffd954f9f68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000ca3700 RCX: 0000000000415eb3 RDX: 0000000000000028 RSI: 0000000000ca3750 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd954f9f70 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000ca3750 R15: 0000000000000003 INFO: task syz-executor.0:16078 blocked for more than 145 seconds. Not tainted 5.8.0-rc6-next-20200720-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28352 16078 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:3533 [inline] __schedule+0x908/0x21e0 kernel/sched/core.c:4289 schedule+0xd0/0x2a0 kernel/sched/core.c:4364 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1994 __do_sys_sendto net/socket.c:2006 [inline] __se_sys_sendto net/socket.c:2002 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2002 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x415eb3 Code: Bad RIP value. RSP: 002b:00007ffff7262b78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000ca3700 RCX: 0000000000415eb3 RDX: 0000000000000028 RSI: 0000000000ca3750 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffff7262b80 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000ca3750 R15: 0000000000000003 INFO: task syz-executor.5:16080 can't die for more than 145 seconds. syz-executor.5 D27512 16080 7409 0x00000004 Call Trace: context_switch kernel/sched/core.c:3533 [inline] __schedule+0x908/0x21e0 kernel/sched/core.c:4289 schedule+0xd0/0x2a0 kernel/sched/core.c:4364 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2362 ___sys_sendmsg+0xf3/0x170 net/socket.c:2416 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2449 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f5f57b5bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002b5c0 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffcb8be0cff R14: 00007f5f57b5c9c0 R15: 000000000078bf0c INFO: task syz-executor.5:16080 blocked for more than 146 seconds. Not tainted 5.8.0-rc6-next-20200720-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27512 16080 7409 0x00000004 Call Trace: context_switch kernel/sched/core.c:3533 [inline] __schedule+0x908/0x21e0 kernel/sched/core.c:4289 schedule+0xd0/0x2a0 kernel/sched/core.c:4364 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2362 ___sys_sendmsg+0xf3/0x170 net/socket.c:2416 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2449 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f5f57b5bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002b5c0 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffcb8be0cff R14: 00007f5f57b5c9c0 R15: 000000000078bf0c Showing all locks held in the system: 3 locks held by kworker/0:0/5: #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc90000cbfda8 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffff8880881c0370 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x5d/0xbe0 drivers/net/netdevsim/dev.c:594 6 locks held by kworker/u4:1/21: #0: ffff8880a977d938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880a977d938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880a977d938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880a977d938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880a977d938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880a977d938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc90000dd7da8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffffffff8a8487b0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa00 net/core/net_namespace.c:565 #3: ffffffff8a879248 (devlink_mutex){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x1c/0x190 net/core/devlink.c:9621 #4: ffff8880881c0370 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_port_del_all drivers/net/netdevsim/dev.c:954 [inline] #4: ffff8880881c0370 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_reload_destroy+0x9e/0x1e0 drivers/net/netdevsim/dev.c:1133 #5: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x705/0xac0 net/core/dev.c:9809 1 lock held by khungtaskd/1161: #0: ffffffff89c52bc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5817 1 lock held by in:imklog/6516: #0: ffff88809b92a3f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 2 locks held by kworker/1:7/11416: 3 locks held by kworker/1:9/11418: #0: ffff888214c19d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888214c19d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888214c19d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888214c19d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888214c19d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888214c19d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc900087b7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4543 2 locks held by agetty/19707: #0: ffff888068796098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900026fb2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 3 locks held by kworker/0:11/24343: #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc9001665fda8 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74 3 locks held by kworker/0:1/8170: #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880aa023d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc90008b77da8 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:250 1 lock held by syz-executor.4/16060: #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:705 [inline] #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3423 2 locks held by syz-executor.3/16068: #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 #1: ffffffff89c57228 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff89c57228 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4e8/0x5f0 kernel/rcu/tree_exp.h:836 1 lock held by syz-executor.2/16076: #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 1 lock held by syz-executor.1/16077: #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 1 lock held by syz-executor.0/16078: #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 1 lock held by syz-executor.5/16080: #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8a855648 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1161 Comm: khungtaskd Not tainted 5.8.0-rc6-next-20200720-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16068 Comm: syz-executor.3 Not tainted 5.8.0-rc6-next-20200720-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_next_corpse net/netfilter/nf_conntrack_core.c:2217 [inline] RIP: 0010:nf_ct_iterate_cleanup+0x12f/0x330 net/netfilter/nf_conntrack_core.c:2261 Code: bf 27 45 04 31 ff 89 de e8 9e d3 ff fa 84 db 0f 85 77 01 00 00 e8 51 d7 ff fa 8b 1d 9f 27 45 04 44 89 ee 89 df e8 41 d3 ff fa <44> 39 eb 0f 86 3f ff ff ff e8 33 d7 ff fa 48 8b 15 94 27 45 04 44 RSP: 0018:ffffc900017f6c80 EFLAGS: 00000297 RAX: 0000000000000002 RBX: 0000000000010000 RCX: ffffffff8674691f RDX: 000000000000d431 RSI: ffff88805cd68380 RDI: 0000000000000004 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000010000 R11: 0000000000000000 R12: ffffffff89a64700 R13: 000000000000d431 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fd394eb1700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c001d9b000 CR3: 00000000a6932000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2346 [inline] nf_ct_iterate_cleanup_net+0x113/0x170 net/netfilter/nf_conntrack_core.c:2331 masq_device_event+0xae/0xe0 net/netfilter/nf_nat_masquerade.c:88 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033 call_netdevice_notifiers_extack net/core/dev.c:2045 [inline] call_netdevice_notifiers net/core/dev.c:2059 [inline] __dev_notify_flags+0x1da/0x2b0 net/core/dev.c:8329 dev_change_flags+0x100/0x160 net/core/dev.c:8365 do_setlink+0x87d/0x35c0 net/core/rtnetlink.c:2604 rtnl_group_changelink net/core/rtnetlink.c:3123 [inline] __rtnl_newlink+0xdea/0x1750 net/core/rtnetlink.c:3277 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2362 ___sys_sendmsg+0xf3/0x170 net/socket.c:2416 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2449 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007fd394eb0c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002b5c0 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007fff2341d5bf R14: 00007fd394eb19c0 R15: 000000000078bf0c