bisecting fixing commit since f40ddce88593482919761f74910f42f4b84c004b building syzkaller on 98682e5e2aefc9aad61354f4f3ac93be96002a2a testing commit f40ddce88593482919761f74910f42f4b84c004b with gcc (GCC) 10.2.1 20210217 kernel signature: 31380acbde5081ebcc03b8b1cc92921ed4a81eb7f97a79d4e8ce6ac16d2b8953 run #0: crashed: INFO: task hung in addrconf_dad_work run #1: crashed: INFO: task hung in cfg80211_event_work run #2: crashed: INFO: task hung in addrconf_dad_work run #3: crashed: INFO: task hung in linkwatch_event run #4: crashed: INFO: task hung in addrconf_dad_work run #5: crashed: INFO: task hung in addrconf_dad_work run #6: crashed: INFO: task hung in addrconf_dad_work run #7: crashed: INFO: task hung in disconnect_work run #8: crashed: INFO: task hung in linkwatch_event run #9: crashed: INFO: task hung in addrconf_dad_work run #10: crashed: INFO: task hung in linkwatch_event run #11: crashed: INFO: task hung in addrconf_dad_work run #12: crashed: INFO: task hung in linkwatch_event run #13: crashed: INFO: task hung in addrconf_dad_work run #14: crashed: INFO: task hung in linkwatch_event run #15: crashed: INFO: task hung in linkwatch_event run #16: crashed: INFO: task hung in addrconf_dad_work run #17: crashed: INFO: task hung in linkwatch_event run #18: crashed: INFO: task hung in disconnect_work run #19: crashed: INFO: task hung in disconnect_work testing current HEAD 70585216fe7730d9fb5453d3e2804e149d0fe201 testing commit 70585216fe7730d9fb5453d3e2804e149d0fe201 with gcc (GCC) 10.2.1 20210217 kernel signature: 3b8945125597aa9c361f9be34c1a3857f3c409e12303f6ee2e2fe4a910083f16 run #0: crashed: INFO: task hung in addrconf_dad_work run #1: crashed: INFO: task hung in linkwatch_event run #2: crashed: INFO: task hung in linkwatch_event run #3: crashed: INFO: task hung in addrconf_dad_work run #4: crashed: INFO: task hung in addrconf_dad_work run #5: crashed: INFO: task hung in disconnect_work run #6: crashed: INFO: task hung in addrconf_dad_work run #7: crashed: INFO: task hung in addrconf_dad_work run #8: crashed: INFO: task hung in addrconf_dad_work run #9: crashed: INFO: task hung in linkwatch_event revisions tested: 2, total time: 26m44.303346487s (build: 13m40.402208665s, test: 12m12.437016159s) the crash still happens on HEAD commit msg: Merge branch 'akpm' (patches from Andrew) crash: INFO: task hung in linkwatch_event INFO: task kworker/0:1:7 blocked for more than 143 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:1 state:D stack:27072 pid: 7 ppid: 2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 linkwatch_event+0x5/0x50 net/core/link_watch.c:250 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2276 worker_thread+0x598/0xf80 kernel/workqueue.c:2422 kthread+0x36f/0x450 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/1:1:36 blocked for more than 143 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:1 state:D stack:27512 pid: 36 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 addrconf_dad_work+0x9f/0x11a0 net/ipv6/addrconf.c:4031 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2276 worker_thread+0x598/0xf80 kernel/workqueue.c:2422 kthread+0x36f/0x450 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.1:8781 blocked for more than 143 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:24456 pid: 8781 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5561 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 __sys_sendto+0x1a4/0x270 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:1985 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41922c RSP: 002b:00007ffc376967c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000014a4320 RCX: 000000000041922c RDX: 000000000000002c RSI: 00000000014a4370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffc37696804 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: 00000000014a4370 INFO: task syz-executor.5:8785 blocked for more than 144 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:24184 pid: 8785 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5561 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 __sys_sendto+0x1a4/0x270 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:1985 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41922c RSP: 002b:00007ffcc87fff00 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000014a4320 RCX: 000000000041922c RDX: 0000000000000028 RSI: 00000000014a4370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffcc87fff44 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: 00000000014a4370 INFO: task syz-executor.2:8787 blocked for more than 144 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:24096 pid: 8787 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5561 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 __sys_sendto+0x1a4/0x270 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:1985 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41922c RSP: 002b:00007fff9562d110 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000014a4320 RCX: 000000000041922c RDX: 000000000000002c RSI: 00000000014a4370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fff9562d154 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: 00000000014a4370 INFO: task syz-executor.4:8788 blocked for more than 144 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:24424 pid: 8788 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5561 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 __sys_sendto+0x1a4/0x270 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:1985 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41922c RSP: 002b:00007ffece524b90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000014a4320 RCX: 000000000041922c RDX: 0000000000000028 RSI: 00000000014a4370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffece524bd4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: 00000000014a4370 INFO: task syz-executor.0:8789 blocked for more than 145 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:24456 pid: 8789 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 nl80211_pre_doit+0x1d/0x480 net/wireless/nl80211.c:14819 genl_family_rcv_msg_doit+0x1bc/0x2f0 net/netlink/genetlink.c:734 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x27a/0x4a0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 __sys_sendto+0x1a4/0x270 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:1985 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41922c RSP: 002b:00007ffd9f19a710 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000014a4320 RCX: 000000000041922c RDX: 0000000000000040 RSI: 00000000014a4370 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd9f19a754 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: 00000000014a4370 INFO: task kworker/0:6:10053 blocked for more than 145 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:6 state:D stack:27376 pid:10053 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 addrconf_dad_work+0x9f/0x11a0 net/ipv6/addrconf.c:4031 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2276 worker_thread+0x598/0xf80 kernel/workqueue.c:2422 kthread+0x36f/0x450 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/0:8:10089 blocked for more than 145 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:8 state:D stack:27752 pid:10089 ppid: 2 flags:0x00004000 Workqueue: events disconnect_work Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 disconnect_work+0xf/0x1b0 net/wireless/sme.c:663 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2276 worker_thread+0x598/0xf80 kernel/workqueue.c:2422 kthread+0x36f/0x450 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.3:10138 blocked for more than 146 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:26520 pid:10138 ppid: 8782 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x8de/0x2390 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104 nl80211_pre_doit+0x1d/0x480 net/wireless/nl80211.c:14819 genl_family_rcv_msg_doit+0x1bc/0x2f0 net/netlink/genetlink.c:734 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x27a/0x4a0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2350 ___sys_sendmsg+0xd3/0x150 net/socket.c:2404 __sys_sendmsg+0xb2/0x140 net/socket.c:2433 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465d99 RSP: 002b:00007fadf33a5188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465d99 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffdf121e3df R14: 00007fadf33a5300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/0:1/7: #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2247 #1: ffffc90000cdfdb0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2251 #2: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0x5/0x50 net/core/link_watch.c:250 3 locks held by kworker/1:1/36: #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2247 #1: ffffc90000e87db0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2251 #2: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0x9f/0x11a0 net/ipv6/addrconf.c:4031 1 lock held by khungtaskd/1653: #0: ffffffff8a96f740 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333 3 locks held by kworker/0:3/4858: #0: ffff88800f070d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800f070d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88800f070d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88800f070d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff88800f070d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff88800f070d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2247 #1: ffffc90001337db0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2251 #2: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x74/0xa30 net/wireless/reg.c:2416 1 lock held by in:imklog/8093: #0: ffff888018b4e370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:974 1 lock held by syz-executor.1/8781: #0: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5561 1 lock held by syz-executor.5/8785: #0: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5561 1 lock held by syz-executor.2/8787: #0: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5561 1 lock held by syz-executor.4/8788: #0: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5561 2 locks held by syz-executor.0/8789: #0: ffffffff8c05d1b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:810 #1: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x1d/0x480 net/wireless/nl80211.c:14819 3 locks held by kworker/0:6/10053: #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888025ab2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2247 #1: ffffc9000a157db0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2251 #2: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0x9f/0x11a0 net/ipv6/addrconf.c:4031 3 locks held by kworker/0:8/10089: #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff88800f063d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2247 #1: ffffc9000a567db0 (cfg80211_disconnect_work){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2251 #2: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: disconnect_work+0xf/0x1b0 net/wireless/sme.c:663 2 locks held by syz-executor.3/10138: #0: ffffffff8c05d1b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:810 #1: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x1d/0x480 net/wireless/nl80211.c:14819 4 locks held by syz-executor.3/10141: 2 locks held by syz-executor.3/10142: #0: ffffffff8c05d1b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:810 #1: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x1d/0x480 net/wireless/nl80211.c:14819 2 locks held by syz-executor.3/10143: #0: ffffffff8c05d1b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:810 #1: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x1d/0x480 net/wireless/nl80211.c:14819 2 locks held by syz-executor.3/10144: #0: ffffffff8c05d1b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:810 #1: ffffffff8bfd2dc8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x1d/0x480 net/wireless/nl80211.c:14819 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1653 Comm: khungtaskd Not tainted 5.13.0-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:79 [inline] dump_stack+0x93/0xc2 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x11f/0x170 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+0x956/0xc30 kernel/hung_task.c:294 kthread+0x36f/0x450 kernel/kthread.c:313 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: 10141 Comm: syz-executor.3 Not tainted 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ieee80211_chanctx_radar_detect+0x1cb/0x340 net/mac80211/util.c:4323 Code: 98 80 f6 ff ff 49 39 c5 0f 84 96 00 00 00 48 bd 00 00 00 00 00 fc ff df 48 8d bb c8 0a 00 00 48 89 f8 48 c1 e8 03 0f b6 04 28 <84> c0 74 06 0f 8e 0a 01 00 00 80 bb c8 0a 00 00 00 74 38 48 8d bb RSP: 0018:ffffc9000a9f7300 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffff888025d48c00 RCX: 0000000000000001 RDX: 1ffff1100270c064 RSI: ffffffff88aaff20 RDI: ffff888025d496c8 RBP: dffffc0000000000 R08: 0000000000000003 R09: ffff888036ea2a37 R10: ffffed1006dd4546 R11: ffff888036ea0c68 R12: 0000000000000000 R13: ffff888013860320 R14: ffff888013860300 R15: ffff888013860340 FS: 00007fadf3384700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa0e50b2000 CR3: 00000000399d4000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_check_combinations+0x329/0x700 net/mac80211/util.c:4382 ieee80211_check_concurrent_iface+0x3a6/0x4c0 net/mac80211/iface.c:306 ieee80211_runtime_change_iftype net/mac80211/iface.c:1630 [inline] ieee80211_if_change_type+0x1dd/0x660 net/mac80211/iface.c:1676 ieee80211_change_iface+0x23/0x1d0 net/mac80211/cfg.c:157 rdev_change_virtual_intf net/wireless/rdev-ops.h:69 [inline] cfg80211_change_iface+0x24a/0xc40 net/wireless/util.c:1070 nl80211_set_interface+0x435/0x840 net/wireless/nl80211.c:3918 genl_family_rcv_msg_doit+0x1e4/0x2f0 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x27a/0x4a0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2350 ___sys_sendmsg+0xd3/0x150 net/socket.c:2404 __sys_sendmsg+0xb2/0x140 net/socket.c:2433 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465d99 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:00007fadf3384188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465d99 RDX: 0000000004000004 RSI: 00000000200000c0 RDI: 0000000000000005 RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffdf121e3df R14: 00007fadf3384300 R15: 0000000000022000