bisecting fixing commit since 31acccdc877486a649a86d37725a15175fcd5ed6 building syzkaller on cca8798699baeeccbf80af23d234ac19a5d667aa testing commit 31acccdc877486a649a86d37725a15175fcd5ed6 with gcc (GCC) 8.4.1 20210217 kernel signature: 8fb462b0c4119b489adb709c17b92ef9c0c62441a3c1f8457b5573e7dbb13b95 all runs: crashed: INFO: task hung in rtnl_lock testing current HEAD 2cae3e25b70668fd413311277d56b6fe41900789 testing commit 2cae3e25b70668fd413311277d56b6fe41900789 with gcc (GCC) 8.4.1 20210217 kernel signature: e67e6556841e2b928225521dd5edcaef63c0a80fb16d7438a0ea87306a17eec3 all runs: crashed: INFO: task hung in rtnl_lock revisions tested: 2, total time: 29m30.435055042s (build: 16m36.660431812s, test: 12m16.748768727s) the crash still happens on HEAD commit msg: Linux 4.19.179 crash: INFO: task hung in rtnl_lock Bluetooth: hci3: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci0: command 0x0406 tx timeout INFO: task kworker/1:3:7640 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:3 D25048 7640 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2152 worker_thread+0x85/0xb60 kernel/workqueue.c:2295 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.2:9323 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28440 9323 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: Bad RIP value. RSP: 002b:00007f0c5b9e0188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000055bfa8 RCX: 0000000000465889 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000004 RBP: 00000000004af68d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bfa8 R13: 00007ffd8561d6df R14: 00007f0c5b9e0300 R15: 0000000000022000 INFO: task syz-executor.2:9349 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28776 9349 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 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:00007f0c5b9be030 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f0c5b9be110 RCX: 0000000000418d1c RDX: 0000000000000020 RSI: 00007f0c5b9be160 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007f0c5b9be074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000004 R14: 0000000000000000 R15: 00007f0c5b9be160 INFO: task syz-executor.2:9350 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28440 9350 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: Bad RIP value. RSP: 002b:00007f0c5b99e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000055c0f8 RCX: 0000000000465889 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 RBP: 00000000004af68d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055c0f8 R13: 00007ffd8561d6df R14: 00007f0c5b99e300 R15: 0000000000022000 INFO: task syz-executor.2:9351 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28776 9351 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 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:00007f0c5b97bfd0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f0c5b97c0f0 RCX: 0000000000418d1c RDX: 0000000000000020 RSI: 00007f0c5b97c140 RDI: 0000000000000005 RBP: 0000000000000000 R08: 00007f0c5b97c014 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000005 R14: 0000000000000000 R15: 00007f0c5b97c140 INFO: task syz-executor.2:9353 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28776 9353 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 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:00007f0c5b93a030 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f0c5b93a110 RCX: 0000000000418d1c RDX: 0000000000000020 RSI: 00007f0c5b93a160 RDI: 0000000000000007 RBP: 0000000000000000 R08: 00007f0c5b93a074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000007 R14: 0000000000000000 R15: 00007f0c5b93a160 INFO: task syz-executor.2:9354 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28440 9354 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465889 Code: Bad RIP value. RSP: 002b:00007f0c5b91a188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000055c398 RCX: 0000000000465889 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006 RBP: 00000000004af68d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055c398 R13: 00007ffd8561d6df R14: 00007f0c5b91a300 R15: 0000000000022000 INFO: task syz-executor.3:9325 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28776 9325 7806 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 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:00007ff6b369f030 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007ff6b369f110 RCX: 0000000000418d1c RDX: 0000000000000020 RSI: 00007ff6b369f160 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007ff6b369f074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000004 R14: 0000000000000000 R15: 00007ff6b369f160 INFO: task syz-executor.3:9328 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27688 9328 7806 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 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:00007ff6b367dfd0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007ff6b367e0f0 RCX: 0000000000418d1c RDX: 0000000000000020 RSI: 00007ff6b367e140 RDI: 0000000000000005 RBP: 0000000000000000 R08: 00007ff6b367e014 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000005 R14: 0000000000000000 R15: 00007ff6b367e140 INFO: task syz-executor.3:9331 blocked for more than 140 seconds. Not tainted 4.19.179-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28776 9331 7806 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:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 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:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 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:00007ff6b365d030 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007ff6b365d110 RCX: 0000000000418d1c RDX: 0000000000000020 RSI: 00007ff6b365d160 RDI: 0000000000000007 RBP: 0000000000000000 R08: 00007ff6b365d074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 R13: 0000000000000007 R14: 0000000000000000 R15: 00007ff6b365d160 Showing all locks held in the system: 3 locks held by kworker/0:0/5: #0: 00000000312425d3 ((wq_completion)"events_power_efficient"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 00000000d0d4b46f ((reg_check_chans).work){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 #2: 00000000fc077ae8 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 1 lock held by khungtaskd/1556: #0: 00000000cc125a31 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 1 lock held by in:imklog/7233: #0: 00000000d705b643 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 3 locks held by kworker/1:3/7640: #0: 00000000ae7c3085 ((wq_completion)"events"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 0000000080eb68f1 ((linkwatch_work).work){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 #2: 00000000fc077ae8 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/0:4/7839: #0: 0000000040cd6ce4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 000000009b38b83f ((addr_chk_work).work){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 #2: 00000000fc077ae8 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 4 locks held by syz-executor.2/9322: 2 locks held by syz-executor.2/9323: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9349: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9350: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9351: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9353: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9354: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9325: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9328: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9331: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9336: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9356: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9358: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9327: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9332: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9337: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9340: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9359: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9363: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9330: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9335: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9339: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9342: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9361: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9365: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9334: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9338: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9341: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9345: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9366: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9369: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9344: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9346: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9347: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9348: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9372: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9373: #0: 00000000a60e8e23 (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000009d6d8279 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1556 Comm: khungtaskd Not tainted 4.19.179-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9113 Comm: kworker/u4:7 Not tainted 4.19.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy15 ieee80211_iface_work RIP: 0010:hlock_class kernel/locking/lockdep.c:152 [inline] RIP: 0010:mark_lock+0x89/0x12f0 kernel/locking/lockdep.c:3105 Code: 89 c1 48 c1 e9 03 0f b6 14 11 84 d2 74 09 80 fa 03 0f 8e 98 04 00 00 25 ff 1f 00 00 4c 69 e0 50 01 00 00 49 81 ec 50 01 00 00 <49> 81 c4 40 35 5f 8b 49 8d 7c 24 30 48 b8 00 00 00 00 00 fc ff df RSP: 0018:ffff8881deaefa98 EFLAGS: 00000006 RAX: 0000000000000642 RBX: ffff8881f1baad70 RCX: 1ffff1103e3755b2 RDX: 0000000000000000 RSI: ffff8881f1baad70 RDI: ffff8881f1baa4c0 RBP: ffff8881deaefae0 R08: ffff8881f1baad90 R09: 0000000000000001 R10: ffff8881f1baad70 R11: ffff8881f1baad34 R12: 0000000000083550 R13: 0000000000000040 R14: 0000000000000006 R15: ffff8881f1baa4c0 FS: 0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff1b6567000 CR3: 000000000986d006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_irqflags kernel/locking/lockdep.c:3027 [inline] __lock_acquire+0x732/0x47c0 kernel/locking/lockdep.c:3372 lock_acquire+0x180/0x3a0 kernel/locking/lockdep.c:3907 process_one_work+0x76c/0x15a0 kernel/workqueue.c:2128 worker_thread+0x85/0xb60 kernel/workqueue.c:2295 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415