wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready INFO: task kworker/0:3:6032 blocked for more than 140 seconds. Not tainted 4.14.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:3 D29112 6032 2 0x80000000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 addrconf_dad_work+0x89/0xef0 net/ipv6/addrconf.c:3917 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task kworker/0:0:7991 blocked for more than 140 seconds. Not tainted 4.14.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:0 D27536 7991 2 0x80000000 Workqueue: events disconnect_work Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 disconnect_work+0x14/0x1d0 net/wireless/sme.c:664 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task kworker/0:2:8043 blocked for more than 140 seconds. Not tainted 4.14.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:2 D30600 8043 2 0x80000000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 linkwatch_event+0xa/0x50 net/core/link_watch.c:236 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Showing all locks held in the system: 1 lock held by khungtaskd/1531: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 3 locks held by kworker/0:3/6032: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&(&ifa->dad_work)->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (rtnl_mutex){+.+.}, at: [] addrconf_dad_work+0x89/0xef0 net/ipv6/addrconf.c:3917 3 locks held by kworker/0:0/7991: #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: (cfg80211_disconnect_work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (rtnl_mutex){+.+.}, at: [] disconnect_work+0x14/0x1d0 net/wireless/sme.c:664 3 locks held by kworker/0:2/8043: #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((linkwatch_work).work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (rtnl_mutex){+.+.}, at: [] linkwatch_event+0xa/0x50 net/core/link_watch.c:236 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8042 Comm: syz-executor030 Not tainted 4.14.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b4e002c0 task.stack: ffff8880951b0000 RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x50 kernel/kcov.c:68 RSP: 0018:ffff8880951b7480 EFLAGS: 00000246 RAX: ffff8880b4e002c0 RBX: ffff888095769580 RCX: 1ffffffff1279ee0 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888095769d60 RBP: ffff8880aa3f9820 R08: 0000000000000000 R09: 0000000000040596 R10: ffff8880b4e00bc0 R11: ffff8880b4e002c0 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880aa3f9800 R15: 0000000000000000 FS: 000000000194a880(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0b73e1a000 CR3: 000000009635a000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_chanctx_radar_detect+0x1b6/0x350 net/mac80211/util.c:3349 ieee80211_check_combinations+0x31d/0x6e0 net/mac80211/util.c:3408 ieee80211_check_concurrent_iface+0x3a6/0x530 net/mac80211/iface.c:311 ieee80211_runtime_change_iftype net/mac80211/iface.c:1558 [inline] ieee80211_if_change_type+0x212/0x470 net/mac80211/iface.c:1596 ieee80211_change_iface+0x26/0x1e0 net/mac80211/cfg.c:156 rdev_change_virtual_intf net/wireless/rdev-ops.h:69 [inline] cfg80211_change_iface+0x246/0x13d0 net/wireless/util.c:1048 nl80211_set_interface+0x588/0x760 net/wireless/nl80211.c:2926 genl_family_rcv_msg+0x572/0xb20 net/netlink/genetlink.c:600 genl_rcv_msg+0xaf/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 genl_rcv+0x24/0x40 net/netlink/genetlink.c:636 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4423f9 RSP: 002b:00007ffef90b5778 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004423f9 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000004 RBP: 000000306e616c77 R08: 0000001300000000 R09: 0000001300000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000dfaed R13: 0000000000000000 R14: 000000000000000c R15: 0000000000000004 Code: 00 00 e9 c6 ed ff ff 90 65 48 8b 04 25 80 df 01 00 48 85 c0 74 1a 65 8b 15 5b a2 aa 7e 81 e2 00 01 1f 00 75 0b 8b 90 58 13 00 00 <83> fa 01 74 01 c3 48 8b 34 24 48 8b 88 60 13 00 00 8b 80 5c 13