bisecting fixing commit since 31acccdc877486a649a86d37725a15175fcd5ed6 building syzkaller on cca8798699baeeccbf80af23d234ac19a5d667aa testing commit 31acccdc877486a649a86d37725a15175fcd5ed6 with gcc (GCC) 8.4.1 20210217 kernel signature: 48f7c5762bde4cf651e4c7ab5d6a428ad5f79d69e65c072d97fe7b0f086d6050 all runs: crashed: INFO: task hung in rtnl_lock testing current HEAD fcfbdfe9626edd5bf00c732e093eed249ecdbfa1 testing commit fcfbdfe9626edd5bf00c732e093eed249ecdbfa1 with gcc (GCC) 8.4.1 20210217 kernel signature: 6bfe4dee37cb2e6042e6d1a4fe43c69ebf4fa91053f7c1dc8505d924efb4089e all runs: crashed: INFO: task hung in rtnl_lock revisions tested: 2, total time: 30m30.27866581s (build: 17m39.862852565s, test: 12m0.294437271s) the crash still happens on HEAD commit msg: Linux 4.19.197 crash: INFO: task hung in rtnl_lock Bluetooth: hci3: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout INFO: task kworker/1:2:3614 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:2 D25960 3614 2 0x80000000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 addrconf_dad_work+0xa1/0xf70 net/ipv6/addrconf.c:3989 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task kworker/0:4:7651 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:4 D24568 7651 2 0x80000000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 addrconf_dad_work+0xa1/0xf70 net/ipv6/addrconf.c:3989 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.5:7798 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D23368 7798 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2457 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 __sys_sendto+0x1f2/0x2e0 net/socket.c:1897 __do_sys_sendto net/socket.c:1909 [inline] __se_sys_sendto net/socket.c:1905 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1905 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x418d1c Code: Bad RIP value. RSP: 002b:00007fffd71e2390 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000001494320 RCX: 0000000000418d1c RDX: 0000000000000040 RSI: 0000000001494370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fffd71e23d4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: 0000000001494370 INFO: task syz-executor.1:7802 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D23768 7802 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2457 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 __sys_sendto+0x1f2/0x2e0 net/socket.c:1897 __do_sys_sendto net/socket.c:1909 [inline] __se_sys_sendto net/socket.c:1905 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1905 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x418d1c Code: Bad RIP value. RSP: 002b:00007ffe55d0c880 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000001494320 RCX: 0000000000418d1c RDX: 0000000000000024 RSI: 0000000001494370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe55d0c8c4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: 0000000001494370 INFO: task syz-executor.4:7804 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D23592 7804 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2457 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 __sys_sendto+0x1f2/0x2e0 net/socket.c:1897 __do_sys_sendto net/socket.c:1909 [inline] __se_sys_sendto net/socket.c:1905 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1905 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x418d1c Code: Bad RIP value. RSP: 002b:00007ffd57e39aa0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000001494320 RCX: 0000000000418d1c RDX: 0000000000000040 RSI: 0000000001494370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd57e39ae4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: 0000000001494370 INFO: task syz-executor.3:7805 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D23864 7805 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2457 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 __sys_sendto+0x1f2/0x2e0 net/socket.c:1897 __do_sys_sendto net/socket.c:1909 [inline] __se_sys_sendto net/socket.c:1905 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1905 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x418d1c Code: Bad RIP value. RSP: 002b:00007fffb6573b90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000001494320 RCX: 0000000000418d1c RDX: 0000000000000028 RSI: 0000000001494370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fffb6573bd4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000003 R14: 0000000000000000 R15: 0000000001494370 INFO: task kworker/0:5:7806 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:5 D26288 7806 2 0x80000000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 linkwatch_event+0x9/0x50 net/core/link_watch.c:236 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.0:9240 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27688 9240 7801 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2457 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 __sys_sendto+0x1f2/0x2e0 net/socket.c:1897 __do_sys_sendto net/socket.c:1909 [inline] __se_sys_sendto net/socket.c:1905 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1905 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x418d1c Code: Bad RIP value. RSP: 002b:00007fd8a2771f80 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fd8a27720f0 RCX: 0000000000418d1c RDX: 0000000000000038 RSI: 00007fd8a2772140 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007fd8a2771fc4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000004 R14: 0000000000000000 R15: 00007fd8a2772140 INFO: task syz-executor.0:9272 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28392 9272 7801 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2457 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 __sys_sendto+0x1f2/0x2e0 net/socket.c:1897 __do_sys_sendto net/socket.c:1909 [inline] __se_sys_sendto net/socket.c:1905 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1905 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x418d1c Code: Bad RIP value. RSP: 002b:00007fd8a2751030 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fd8a2751110 RCX: 0000000000418d1c RDX: 0000000000000020 RSI: 00007fd8a2751160 RDI: 0000000000000006 RBP: 0000000000000000 R08: 00007fd8a2751074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000006 R14: 0000000000000000 R15: 00007fd8a2751160 INFO: task syz-executor.0:9273 blocked for more than 140 seconds. Not tainted 4.19.197-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27688 9273 7801 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x4ba/0x1190 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2457 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 __sys_sendto+0x1f2/0x2e0 net/socket.c:1897 __do_sys_sendto net/socket.c:1909 [inline] __se_sys_sendto net/socket.c:1905 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1905 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x418d1c Code: Bad RIP value. RSP: 002b:00007fd8a2730030 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fd8a2730110 RCX: 0000000000418d1c RDX: 0000000000000020 RSI: 00007fd8a2730160 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007fd8a2730074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000004 R14: 0000000000000000 R15: 00007fd8a2730160 Showing all locks held in the system: 1 lock held by khungtaskd/1568: #0: 00000000fa6b02e7 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4443 3 locks held by kworker/1:2/3614: #0: 00000000c8e25e75 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 000000005430895e ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 #2: 0000000051dbf945 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 1 lock held by in:imklog/7217: #0: 00000000b082ad04 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 3 locks held by kworker/0:4/7651: #0: 00000000c8e25e75 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 000000003eadf306 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 #2: 0000000051dbf945 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 2 locks held by syz-executor.5/7798: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/7802: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/7804: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/7805: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 3 locks held by kworker/0:5/7806: #0: 00000000b808912a ((wq_completion)"events"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 0000000018c4b05f ((linkwatch_work).work){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 #2: 0000000051dbf945 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/0:6/7816: #0: 00000000a843b7df ((wq_completion)"events_power_efficient"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 00000000ab8909d3 ((reg_check_chans).work){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 #2: 0000000051dbf945 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 4 locks held by syz-executor.2/9259: 2 locks held by syz-executor.0/9240: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9272: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9273: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9274: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9275: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9277: #0: 000000005a0db16a (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000224ebc38 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1568 Comm: khungtaskd Not tainted 4.19.197-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+0x17c/0x226 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x120 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:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9259 Comm: syz-executor.2 Not tainted 4.19.197-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ieee80211_chanctx_radar_detect+0x1a7/0x330 net/mac80211/util.c:3493 Code: e0 f7 ff ff 49 39 c7 0f 84 90 00 00 00 49 bc 00 00 00 00 00 fc ff df 48 8d bb 48 09 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 20 <84> c0 74 06 0f 8e 06 01 00 00 80 bb 48 09 00 00 00 74 30 48 8d bb RSP: 0018:ffff8881f1e1f2b0 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffff8881d2ba5b00 RCX: 1ffff1103d58a526 RDX: 1ffff1103d58a524 RSI: 0000000000000000 RDI: ffff8881d2ba6448 RBP: ffff8881f1e1f2e0 R08: 1ffff1103d1621d0 R09: ffffed1039c6b57b R10: 0000000000000001 R11: ffff8881ce35abdf R12: dffffc0000000000 R13: 0000000000000000 R14: ffff8881eac52900 R15: ffff8881eac52920 FS: 00007f9443612700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd8a2731718 CR3: 00000001ef9f0002 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_check_combinations+0x3cb/0x7d0 net/mac80211/util.c:3552 ieee80211_check_concurrent_iface+0x3bc/0x670 net/mac80211/iface.c:312 ieee80211_runtime_change_iftype net/mac80211/iface.c:1537 [inline] ieee80211_if_change_type+0x23c/0x540 net/mac80211/iface.c:1581 ieee80211_change_iface+0x29/0x1e0 net/mac80211/cfg.c:157 rdev_change_virtual_intf net/wireless/rdev-ops.h:69 [inline] cfg80211_change_iface+0x200/0xfe0 net/wireless/util.c:979 nl80211_set_interface+0x45e/0x880 net/wireless/nl80211.c:3205 genl_family_rcv_msg+0x599/0x1000 net/netlink/genetlink.c:602 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:627 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2457 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 ___sys_sendmsg+0x647/0x950 net/socket.c:2225 __sys_sendmsg+0xd9/0x180 net/socket.c:2263 __do_sys_sendmsg net/socket.c:2272 [inline] __se_sys_sendmsg net/socket.c:2270 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2270 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9443612188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000055c0f8 RCX: 0000000000465889 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006 RBP: 00000000004af68d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055c0f8 R13: 00007ffc9d55725f R14: 00007f9443612300 R15: 0000000000022000