Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci0: command 0x0406 tx timeout Bluetooth: hci3: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout INFO: task syz-executor.4:10854 blocked for more than 140 seconds. Not tainted 4.19.150-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28608 10854 6525 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline] _synchronize_rcu_expedited+0x667/0x7b0 kernel/rcu/tree_exp.h:667 synchronize_rcu+0xd5/0x170 kernel/rcu/tree_plugin.h:818 synchronize_net+0x47/0x50 net/core/dev.c:9268 packet_release+0x973/0xb70 net/packet/af_packet.c:3069 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x8a0 fs/file_table.c:278 task_work_run+0x141/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x269/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x57c/0x670 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4177b1 Code: 00 31 c0 48 8b 4c 24 28 e9 b3 fe ff ff 31 f6 e9 53 fe ff ff 48 8b 5a 20 eb 03 48 8b 1b 48 85 db 74 29 8d 41 fe 39 43 58 0f 85 <5d> 01 00 00 8d 71 ff f0 0f b1 73 58 40 0f 94 c6 40 84 f6 0f 85 aa RSP: 002b:00007ffc7f328b60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004177b1 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000001190220 R09: 0000000000000000 R10: 00007ffc7f328c30 R11: 0000000000000293 R12: ffffffffffffffff R13: 0000000000000000 R14: 0000000000000005 R15: 000000000118bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1095: #0: 0000000066b47083 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x291 kernel/locking/lockdep.c:4440 1 lock held by syz-executor.4/10854: #0: 00000000041bc006 (&sb->s_type->i_mutex_key#14){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000041bc006 (&sb->s_type->i_mutex_key#14){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1095 Comm: khungtaskd Not tainted 4.19.150-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+0x22c/0x33e lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x18/0x3d lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0xa62/0x1020 kernel/hung_task.c:287 kthread+0x33f/0x460 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: 3717 Comm: systemd-journal Not tainted 4.19.150-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x7ff3b5fa4c77 Code: 89 cf 48 89 d9 4c 89 4c 24 08 e8 b4 cf ff ff 84 c0 4c 8b 4c 24 08 0f 84 87 02 00 00 49 8b 41 28 80 78 0c 00 0f 85 e5 03 00 00 <41> 0f b6 51 08 44 0f b6 34 24 89 d0 83 e2 fd d0 e8 41 09 c6 41 83 RSP: 002b:00007ffd1fceb120 EFLAGS: 00000246 RAX: 000055a60bdcbdc0 RBX: 000000000011a4a8 RCX: 000000000011a4a8 RDX: 0000000000800000 RSI: 0000000000000010 RDI: 000055a60bdcc140 RBP: 000055a60bdc8060 R08: 000000000011a4b8 R09: 000055a60bdcc140 R10: 0001d8d7df83af0c R11: 00007ff3b37954d8 R12: 0000000000000006 R13: 0000000000000003 R14: 0000000000000010 R15: 000055a60bdcc440 FS: 00007ff3b636b8c0 GS: 0000000000000000