INFO: task kworker/0:0:5 blocked for more than 143 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:13480 pid: 5 ppid: 2 flags:0x00004000 Workqueue: events switchdev_deferred_process_work Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 switchdev_deferred_process_work+0x5/0x10 net/switchdev/switchdev.c:74 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/1:0:17 blocked for more than 143 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:13464 pid: 17 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 addrconf_dad_work+0x3f/0x500 net/ipv6/addrconf.c:4027 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/0:2:2688 blocked for more than 143 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack:13544 pid: 2688 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 addrconf_dad_work+0x3f/0x500 net/ipv6/addrconf.c:4027 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.0:6966 blocked for more than 143 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:11832 pid: 6966 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 netlink_rcv_skb+0x41/0x110 net/netlink/af_netlink.c:2470 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x248/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:671 __sys_sendto+0xec/0x160 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417817 Code: Bad RIP value. RSP: 002b:00007ffeeda45700 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 0000000000417817 RDX: 0000000000000028 RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffeeda45710 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016a4350 R15: 0000000000000003 INFO: task syz-executor.2:6967 blocked for more than 143 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:11832 pid: 6967 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 netlink_rcv_skb+0x41/0x110 net/netlink/af_netlink.c:2470 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x248/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:671 __sys_sendto+0xec/0x160 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417817 Code: Bad RIP value. RSP: 002b:00007fffb6e50680 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 0000000000417817 RDX: 0000000000000028 RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fffb6e50690 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016a4350 R15: 0000000000000003 INFO: task syz-executor.4:6969 blocked for more than 144 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:11832 pid: 6969 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 netlink_rcv_skb+0x41/0x110 net/netlink/af_netlink.c:2470 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x248/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:671 __sys_sendto+0xec/0x160 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417817 Code: Bad RIP value. RSP: 002b:00007ffdc21d5730 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 0000000000417817 RDX: 0000000000000040 RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffdc21d5740 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016a4350 R15: 0000000000000003 INFO: task syz-executor.3:6971 blocked for more than 144 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:11736 pid: 6971 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 netlink_rcv_skb+0x41/0x110 net/netlink/af_netlink.c:2470 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x248/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:671 __sys_sendto+0xec/0x160 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417817 Code: Bad RIP value. RSP: 002b:00007ffe1473fbf0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 0000000000417817 RDX: 0000000000000040 RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe1473fc00 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016a4350 R15: 0000000000000003 INFO: task syz-executor.5:6972 blocked for more than 144 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:11592 pid: 6972 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 netlink_rcv_skb+0x41/0x110 net/netlink/af_netlink.c:2470 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x248/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:671 __sys_sendto+0xec/0x160 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417817 Code: Bad RIP value. RSP: 002b:00007ffe6a0c9930 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 0000000000417817 RDX: 000000000000002c RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe6a0c9940 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016a4350 R15: 0000000000000003 INFO: task kworker/0:4:7374 blocked for more than 144 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:4 state:D stack:13160 pid: 7374 ppid: 2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x418/0x910 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 kernel/locking/mutex.c:1103 linkwatch_event+0x5/0x30 net/core/link_watch.c:250 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 3 locks held by kworker/0:0/5: #0: ffff88812bc55738 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88812bc55738 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88812bc55738 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #1: ffffc90000c93e70 (deferred_process_work){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90000c93e70 (deferred_process_work){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90000c93e70 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #2: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0x5/0x10 net/switchdev/switchdev.c:74 3 locks held by kworker/1:0/17: #0: ffff88812542ed38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88812542ed38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88812542ed38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #1: ffffc90000cfbe70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90000cfbe70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90000cfbe70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #2: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0x3f/0x500 net/ipv6/addrconf.c:4027 1 lock held by khungtaskd/657: #0: ffffffff84518fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x17a kernel/locking/lockdep.c:5853 3 locks held by kworker/0:2/2688: #0: ffff88812542ed38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88812542ed38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88812542ed38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #1: ffffc90005b93e70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90005b93e70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90005b93e70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #2: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0x3f/0x500 net/ipv6/addrconf.c:4027 1 lock held by in:imklog/6361: #0: ffff88812b2704f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x45/0x50 fs/file.c:930 3 locks held by kworker/0:3/6395: #0: ffff88812bc55f38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88812bc55f38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88812bc55f38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #1: ffffc9000340fe70 ((reg_check_chans).work){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc9000340fe70 ((reg_check_chans).work){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc9000340fe70 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #2: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x23/0x4a0 net/wireless/reg.c:2199 1 lock held by syz-executor.0/6966: #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 1 lock held by syz-executor.2/6967: #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 1 lock held by syz-executor.4/6969: #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 1 lock held by syz-executor.3/6971: #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 1 lock held by syz-executor.5/6972: #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x14a/0x480 net/core/rtnetlink.c:5560 3 locks held by kworker/0:4/7374: #0: ffff88812bc55738 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88812bc55738 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88812bc55738 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #1: ffffc90001053e70 ((linkwatch_work).work){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90001053e70 ((linkwatch_work).work){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90001053e70 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x1de/0x5f0 kernel/workqueue.c:2240 #2: ffffffff8486f408 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0x5/0x30 net/core/link_watch.c:250 2 locks held by syz-executor.1/8302: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 657 Comm: khungtaskd Not tainted 5.9.0-rc6-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+0xa3/0xcc lib/dump_stack.c:118 nmi_cpu_backtrace.cold.8+0x3e/0x58 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xd5/0xec lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0x58e/0x680 kernel/hung_task.c:295 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_preemption_disabled+0x21/0xd0 lib/smp_processor_id.c:55 Code: 01 0f 00 00 00 c3 cc cc cc 41 55 41 54 55 53 65 8b 1d f3 f2 dd 7c 65 8b 05 0c 5e de 7c a9 ff ff ff 7f 74 09 89 d8 5b 5d 41 5c <41> 5d c3 48 83 3d 14 fd 2a 01 00 0f 84 98 00 00 00 9c 58 0f 1f 44 RSP: 0018:ffffc90000d1fd50 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffc90000d1fd8f RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8424c83e RDI: ffffffff84086c09 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88812b0de580 R11: b552eb836fb04bcd R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff84518fe0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e72bb6000 CR3: 000000010eee2000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:326 [inline] rcu_is_watching+0x11/0x70 kernel/rcu/tree.c:1111 rcu_read_lock_held_common+0x1c/0x40 kernel/rcu/update.c:119 rcu_read_lock_sched_held+0x1e/0x80 kernel/rcu/update.c:134 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x37d/0x400 kernel/locking/lockdep.c:5003 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline] batadv_nc_worker+0x66/0x240 net/batman-adv/network-coding.c:718 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x148/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294