bisecting fixing commit since 8098bd69bc4e925070313b1b95d03510f4f24738 building syzkaller on d32b0bbf2f8cfe548553c4012e2c0f79040d999f testing commit 8098bd69bc4e925070313b1b95d03510f4f24738 with gcc (GCC) 8.1.0 kernel signature: 372d1b38b84aac8f6d1f02eb8c6a16e60d28d9c4a3eb127342eb6fcea5fbaa08 run #0: crashed: INFO: task hung in addrconf_dad_work run #1: crashed: INFO: task hung in reg_check_chans_work run #2: crashed: INFO: task hung in reg_check_chans_work run #3: crashed: INFO: task hung in linkwatch_event run #4: crashed: INFO: task hung in reg_check_chans_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 addrconf_dad_work run #8: crashed: INFO: task hung in reg_check_chans_work run #9: crashed: INFO: task hung in linkwatch_event testing current HEAD 1f685e6adbbe3c7b1bd9053be771b898d9efa655 testing commit 1f685e6adbbe3c7b1bd9053be771b898d9efa655 with gcc (GCC) 8.1.0 kernel signature: 4a953f48f31ebdadcc93dfce38566a7b6a70435305e752942233125f5074365f run #0: crashed: INFO: task hung in reg_check_chans_work run #1: crashed: INFO: task hung in reg_check_chans_work run #2: crashed: INFO: task hung in reg_check_chans_work run #3: crashed: INFO: task hung in reg_check_chans_work run #4: crashed: INFO: task hung in reg_check_chans_work run #5: crashed: INFO: task hung in addrconf_dad_work run #6: crashed: INFO: task hung in linkwatch_event run #7: crashed: INFO: task hung in addrconf_dad_work run #8: crashed: INFO: task hung in reg_check_chans_work run #9: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor733217738" "root@10.128.15.198:./syz-executor733217738"]: exit status 1 Connection timed out during banner exchange lost connection revisions tested: 2, total time: 26m28.376418762s (build: 10m26.310508231s, test: 15m17.446945605s) the crash still happens on HEAD commit msg: ptp: ptp_ines: prevent build when HAS_IOMEM is not set crash: INFO: task hung in reg_check_chans_work INFO: task kworker/0:1:14 blocked for more than 143 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:1 state:D stack:13480 pid: 14 ppid: 2 flags:0x00004000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 reg_check_chans_work+0x23/0x4b0 net/wireless/reg.c:2404 process_one_work+0x293/0x610 kernel/workqueue.c:2275 worker_thread+0x38/0x380 kernel/workqueue.c:2421 kthread+0x145/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 INFO: task syz-executor.3:6162 blocked for more than 143 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:11624 pid: 6162 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 ieee80211_register_hw+0x556/0xd20 net/mac80211/main.c:1210 mac80211_hwsim_new_radio+0xac0/0x16c0 drivers/net/wireless/mac80211_hwsim.c:3261 hwsim_new_radio_nl+0x2b0/0x400 drivers/net/wireless/mac80211_hwsim.c:3822 genl_family_rcv_msg_doit.isra.17+0x102/0x140 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0xdb/0x1e0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x276/0x4c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 __sys_sendto+0xec/0x160 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:1983 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4178d7 RSP: 002b:00007ffd906bf2b0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 00000000004178d7 RDX: 0000000000000024 RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd906bf2c0 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016a4350 R15: 0000000000000003 INFO: task syz-executor.2:6163 blocked for more than 143 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:11752 pid: 6163 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x117/0x1e0 net/netlink/genetlink.c:798 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x276/0x4c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 __sys_sendto+0xec/0x160 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:1983 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4178d7 RSP: 002b:00007ffcfc532d60 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 00000000004178d7 RDX: 0000000000000028 RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffcfc532d70 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffcfc532dd4 R13: 0000000000000010 R14: 00000000016a4350 R15: 0000000000000003 INFO: task syz-executor.0:6166 blocked for more than 143 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:11624 pid: 6166 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x15e/0x4c0 net/core/rtnetlink.c:5561 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x276/0x4c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 __sys_sendto+0xec/0x160 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:1983 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4178d7 RSP: 002b:00007ffd5afc1fb0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 00000000004178d7 RDX: 0000000000000020 RSI: 00000000016a4350 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007ffd5afc1fc0 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffd5afc202c R13: 0000000000000010 R14: 00000000016a4350 R15: 0000000000000004 INFO: task syz-executor.4:6168 blocked for more than 144 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:11728 pid: 6168 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x117/0x1e0 net/netlink/genetlink.c:798 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x276/0x4c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 __sys_sendto+0xec/0x160 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:1983 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4178d7 RSP: 002b:00007ffda05225f0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 00000000004178d7 RDX: 0000000000000028 RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffda0522600 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffda0522664 R13: 0000000000000010 R14: 00000000016a4350 R15: 0000000000000003 INFO: task syz-executor.5:6170 blocked for more than 144 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:11624 pid: 6170 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x15e/0x4c0 net/core/rtnetlink.c:5561 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x276/0x4c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 __sys_sendto+0xec/0x160 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:1983 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4178d7 RSP: 002b:00007ffebe06acf0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a4300 RCX: 00000000004178d7 RDX: 000000000000002c RSI: 00000000016a4350 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffebe06ad00 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016a4350 R15: 0000000000000003 INFO: task kworker/0:4:7455 blocked for more than 144 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:4 state:D stack:13152 pid: 7455 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 addrconf_dad_work+0x3f/0x550 net/ipv6/addrconf.c:4028 process_one_work+0x293/0x610 kernel/workqueue.c:2275 worker_thread+0x38/0x380 kernel/workqueue.c:2421 kthread+0x145/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 INFO: task kworker/1:4:7464 blocked for more than 144 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:12928 pid: 7464 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 addrconf_dad_work+0x3f/0x550 net/ipv6/addrconf.c:4028 process_one_work+0x293/0x610 kernel/workqueue.c:2275 worker_thread+0x38/0x380 kernel/workqueue.c:2421 kthread+0x145/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 INFO: task syz-executor.1:7530 blocked for more than 144 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:12464 pid: 7530 ppid: 6171 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 tcf_action_init_1+0x238/0x4a0 net/sched/act_api.c:988 tcf_action_init+0xcf/0x1f0 net/sched/act_api.c:1063 tcf_action_add+0x7d/0x190 net/sched/act_api.c:1476 tc_ctl_action+0xdb/0x140 net/sched/act_api.c:1530 rtnetlink_rcv_msg+0x187/0x4c0 net/core/rtnetlink.c:5564 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x276/0x4c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 ____sys_sendmsg+0x1ed/0x230 net/socket.c:2345 ___sys_sendmsg+0x77/0xb0 net/socket.c:2399 __sys_sendmsg+0x52/0xa0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 RSP: 002b:00007f3bfea9cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002e600 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffcd939da5f R14: 00007f3bfea9d9c0 R15: 000000000118bf2c INFO: task syz-executor.1:7536 blocked for more than 145 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:14168 pid: 7536 ppid: 6171 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x429/0x9e0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5202 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x4af/0xa30 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x15e/0x4c0 net/core/rtnetlink.c:5561 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x276/0x4c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 ____sys_sendmsg+0x1ed/0x230 net/socket.c:2345 ___sys_sendmsg+0x77/0xb0 net/socket.c:2399 __sys_sendmsg+0x52/0xa0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 RSP: 002b:00007f3bfea5ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002e600 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000003 RBP: 000000000118c0b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118c07c R13: 00007ffcd939da5f R14: 00007f3bfea5b9c0 R15: 000000000118c07c Showing all locks held in the system: 3 locks held by kworker/0:1/14: #0: ffff888100055f38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff888100055f38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888100055f38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #1: ffffc9000008fe70 ((reg_check_chans).work){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc9000008fe70 ((reg_check_chans).work){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc9000008fe70 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #2: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x23/0x4b0 net/wireless/reg.c:2404 1 lock held by khungtaskd/1183: #0: ffffffff84a13060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x1a6 kernel/locking/lockdep.c:6255 1 lock held by in:imklog/5818: #0: ffff888100b812f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x45/0x50 fs/file.c:947 3 locks held by syz-executor.3/6162: #0: ffffffff84e5b010 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:810 #1: ffffffff84e5b0a8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff84e5b0a8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x117/0x1e0 net/netlink/genetlink.c:798 #2: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: ieee80211_register_hw+0x556/0xd20 net/mac80211/main.c:1210 2 locks held by syz-executor.2/6163: #0: ffffffff84e5b010 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:810 #1: ffffffff84e5b0a8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff84e5b0a8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x117/0x1e0 net/netlink/genetlink.c:798 1 lock held by syz-executor.0/6166: #0: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x15e/0x4c0 net/core/rtnetlink.c:5561 2 locks held by syz-executor.4/6168: #0: ffffffff84e5b010 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:810 #1: ffffffff84e5b0a8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff84e5b0a8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x117/0x1e0 net/netlink/genetlink.c:798 1 lock held by syz-executor.5/6170: #0: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x15e/0x4c0 net/core/rtnetlink.c:5561 3 locks held by kworker/0:4/7455: #0: ffff888106ca5f38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff888106ca5f38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888106ca5f38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #1: ffffc90002213e70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90002213e70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90002213e70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #2: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0x3f/0x550 net/ipv6/addrconf.c:4028 3 locks held by kworker/1:4/7464: #0: ffff888106ca5f38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff888106ca5f38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888106ca5f38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #1: ffffc900022abe70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc900022abe70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc900022abe70 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #2: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0x3f/0x550 net/ipv6/addrconf.c:4028 1 lock held by syz-executor.1/7530: #0: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: tcf_action_init_1+0x238/0x4a0 net/sched/act_api.c:988 1 lock held by syz-executor.1/7531: 1 lock held by syz-executor.1/7536: #0: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff84e37c08 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x15e/0x4c0 net/core/rtnetlink.c:5561 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1183 Comm: khungtaskd Not tainted 5.11.0-rc2-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+0xa3/0xc8 lib/dump_stack.c:120 nmi_cpu_backtrace.cold.8+0x68/0x82 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0xd5/0xf0 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+0x5f1/0x6f0 kernel/hung_task.c:294 kthread+0x145/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 925 Comm: kworker/u4:7 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy6 ieee80211_iface_work RIP: 0010:hlock_class kernel/locking/lockdep.c:210 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4507 [inline] RIP: 0010:__lock_acquire+0x1f6/0x1b30 kernel/locking/lockdep.c:4782 Code: c1 e0 06 48 05 60 1b 52 86 44 0f b7 a8 b8 00 00 00 0f b7 45 20 66 25 ff 1f 0f b7 c0 48 0f a3 05 20 0f 2c 05 0f 83 e5 05 00 00 <48> 8d 04 40 48 c1 e0 06 48 05 60 1b 52 86 66 45 85 ed 8b b3 80 09 RSP: 0018:ffffc90001c43200 EFLAGS: 00000047 RAX: 0000000000000000 RBX: ffff888101724180 RCX: 0000000000000008 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888101724b08 RBP: ffff888101724bd0 R08: 00000000000000c8 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000002 R14: ffffffff86b09268 R15: 000000000000000c FS: 0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd4f1bc3000 CR3: 00000001175d5002 CR4: 00000000001706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0xfb/0x440 kernel/locking/lockdep.c:5437 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x58/0x80 kernel/locking/spinlock.c:159 __debug_object_init+0x6a/0x470 lib/debugobjects.c:564 debug_object_init lib/debugobjects.c:615 [inline] debug_object_activate+0x140/0x240 lib/debugobjects.c:701 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] kvfree_call_rcu+0xa1/0x4f0 kernel/rcu/tree.c:3491 cfg80211_update_known_bss+0x62/0x1f0 net/wireless/scan.c:1651 cfg80211_bss_update+0x6d/0x720 net/wireless/scan.c:1698 cfg80211_inform_single_bss_frame_data+0x22c/0x570 net/wireless/scan.c:2400 cfg80211_inform_bss_frame_data+0x32/0x3b0 net/wireless/scan.c:2433 ieee80211_bss_info_update+0x15a/0x400 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1126 [inline] ieee80211_rx_mgmt_probe_beacon+0x392/0x9c0 net/mac80211/ibss.c:1615 ieee80211_ibss_rx_queued_mgmt+0xcf/0x860 net/mac80211/ibss.c:1642 ieee80211_iface_work+0x292/0x3b0 net/mac80211/iface.c:1423 process_one_work+0x293/0x610 kernel/workqueue.c:2275 worker_thread+0x38/0x380 kernel/workqueue.c:2421 kthread+0x145/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296