bisecting fixing commit since 31acccdc877486a649a86d37725a15175fcd5ed6 building syzkaller on cca8798699baeeccbf80af23d234ac19a5d667aa testing commit 31acccdc877486a649a86d37725a15175fcd5ed6 with gcc (GCC) 8.1.0 kernel signature: 4463da964e3d4ed7712d6018b623553a196764e8755f21bf27aa4e1b0c94c721 all runs: crashed: INFO: task hung in rtnl_lock testing current HEAD 4143d798313fffa39f05bf24dd560ace42225c26 testing commit 4143d798313fffa39f05bf24dd560ace42225c26 with gcc (GCC) 8.1.0 kernel signature: 41920df48e8b44e99944309b58d2da8e0065c588f209e087860f649850f011ca all runs: crashed: INFO: task hung in rtnl_lock revisions tested: 2, total time: 28m31.883695756s (build: 16m53.970892289s, test: 11m2.487080746s) the crash still happens on HEAD commit msg: Linux 4.19.165 crash: INFO: task hung in rtnl_lock Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci3: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout INFO: task kworker/1:2:3612 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:2 D25160 3612 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:2155 worker_thread+0x85/0xb60 kernel/workqueue.c:2298 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.1:9334 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28440 9334 7823 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+0x666/0xc50 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: 0033:0x45deb9 Code: Bad RIP value. RSP: 002b:00007fb576276c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002c440 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000004 RBP: 000000000118c008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4 R13: 00007fffbfc9b08f R14: 00007fb5762779c0 R15: 000000000118bfd4 INFO: task syz-executor.1:9360 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28776 9360 7823 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+0x666/0xc50 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: 0033:0x417937 Code: Bad RIP value. RSP: 002b:00007fb576254b40 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fb576254bf0 RCX: 0000000000417937 RDX: 0000000000000020 RSI: 00007fb576254c40 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007fb576254b50 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007fb576254bb4 R13: 0000000000000010 R14: 00007fb576254c40 R15: 0000000000000004 INFO: task syz-executor.1:9361 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28440 9361 7823 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+0x666/0xc50 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: 0033:0x45deb9 Code: Bad RIP value. RSP: 002b:00007fb576234c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002c440 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 RBP: 000000000118c158 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118c124 R13: 00007fffbfc9b08f R14: 00007fb5762359c0 R15: 000000000118c124 INFO: task syz-executor.1:9362 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28776 9362 7823 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+0x666/0xc50 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: 0033:0x417937 Code: Bad RIP value. RSP: 002b:00007fb576212b00 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fb576212be0 RCX: 0000000000417937 RDX: 0000000000000020 RSI: 00007fb576212c30 RDI: 0000000000000005 RBP: 0000000000000000 R08: 00007fb576212b10 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007fb576212b74 R13: 0000000000000010 R14: 00007fb576212c30 R15: 0000000000000005 INFO: task syz-executor.1:9364 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28776 9364 7823 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+0x666/0xc50 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: 0033:0x417937 Code: Bad RIP value. RSP: 002b:00007fb5761d0b40 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fb5761d0bf0 RCX: 0000000000417937 RDX: 0000000000000020 RSI: 00007fb5761d0c40 RDI: 0000000000000007 RBP: 0000000000000000 R08: 00007fb5761d0b50 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007fb5761d0bb4 R13: 0000000000000010 R14: 00007fb5761d0c40 R15: 0000000000000007 INFO: task syz-executor.1:9365 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28440 9365 7823 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+0x666/0xc50 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: 0033:0x45deb9 Code: Bad RIP value. RSP: 002b:00007fb5761b0c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002bf00 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006 RBP: 000000000118c3f8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118c3c4 R13: 00007fffbfc9b08f R14: 00007fb5761b19c0 R15: 000000000118c3c4 INFO: task syz-executor.0:9336 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28776 9336 7828 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+0x666/0xc50 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: 0033:0x417937 Code: Bad RIP value. RSP: 002b:00007feb2fbfbb40 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007feb2fbfbbf0 RCX: 0000000000417937 RDX: 0000000000000020 RSI: 00007feb2fbfbc40 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007feb2fbfbb50 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007feb2fbfbbb4 R13: 0000000000000010 R14: 00007feb2fbfbc40 R15: 0000000000000004 INFO: task syz-executor.0:9337 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27704 9337 7828 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+0x666/0xc50 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: 0033:0x417937 Code: Bad RIP value. RSP: 002b:00007feb2fbdab00 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007feb2fbdabe0 RCX: 0000000000417937 RDX: 0000000000000020 RSI: 00007feb2fbdac30 RDI: 0000000000000005 RBP: 0000000000000000 R08: 00007feb2fbdab10 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007feb2fbdab74 R13: 0000000000000010 R14: 00007feb2fbdac30 R15: 0000000000000005 INFO: task syz-executor.0:9340 blocked for more than 140 seconds. Not tainted 4.19.165-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28776 9340 7828 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+0x666/0xc50 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: 0033:0x417937 Code: Bad RIP value. RSP: 002b:00007feb2fbb9b40 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007feb2fbb9bf0 RCX: 0000000000417937 RDX: 0000000000000020 RSI: 00007feb2fbb9c40 RDI: 0000000000000007 RBP: 0000000000000000 R08: 00007feb2fbb9b50 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007feb2fbb9bb4 R13: 0000000000000010 R14: 00007feb2fbb9c40 R15: 0000000000000007 Showing all locks held in the system: 3 locks held by kworker/0:0/5: #0: 00000000317965df ((wq_completion)"events_power_efficient"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2126 #1: 00000000db372f3f ((reg_check_chans).work){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2130 #2: 0000000024abd746 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/0:1/14: #0: 0000000052d16b0b ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2126 #1: 000000008f0abf5e ((addr_chk_work).work){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2130 #2: 0000000024abd746 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 1 lock held by khungtaskd/1565: #0: 00000000fd977dd9 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 3 locks held by kworker/1:2/3612: #0: 00000000e38b2bed ((wq_completion)"events"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2126 #1: 00000000b794fc46 ((linkwatch_work).work){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2130 #2: 0000000024abd746 (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 1 lock held by in:imklog/7241: #0: 00000000c56b07b7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 4 locks held by syz-executor.1/9333: 2 locks held by syz-executor.1/9334: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9360: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9361: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9362: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9364: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.1/9365: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9336: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9337: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9340: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9344: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9367: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.0/9368: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9339: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9343: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9346: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9349: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9370: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.2/9374: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9342: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9345: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9348: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9352: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9373: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/9375: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9350: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9353: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9355: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9357: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9379: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.3/9381: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9354: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9356: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9358: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9359: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9382: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 2 locks held by syz-executor.4/9384: #0: 000000007862129c (cb_lock){++++}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:637 #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 00000000426102e4 (genl_mutex){+.+.}, at: genl_rcv_msg+0x10e/0x140 net/netlink/genetlink.c:625 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1565 Comm: khungtaskd Not tainted 4.19.165-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/0x22a lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x11a 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: 7 Comm: kworker/u4:0 Not tainted 4.19.165-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:lock_release+0x3f1/0x840 kernel/locking/lockdep.c:3928 Code: 74 01 00 00 65 4c 8b 24 25 80 df 01 00 49 8d bc 24 84 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 92 03 00 00 48 RSP: 0018:ffff8881f527fc60 EFLAGS: 00000807 RAX: dffffc0000000000 RBX: 1ffff1103ea4ff8f RCX: 1ffff1103ea4d947 RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8881f526ca44 RBP: ffff8881f527fd00 R08: 0000000000000000 R09: ffffed103eca4552 R10: ffffed103eca4552 R11: ffff8881f6522a93 R12: ffff8881f526c1c0 R13: 0000000000000002 R14: ffff8881f526ca40 R15: ffff8881f526c1c0 FS: 0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd62081018 CR3: 000000000986d005 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:681 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:423 [inline] batadv_nc_worker+0x191/0x630 net/batman-adv/network-coding.c:730 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2155 worker_thread+0x85/0xb60 kernel/workqueue.c:2298 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415