Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci3: command 0x0406 tx timeout INFO: task syz-executor.4:10004 blocked for more than 140 seconds. Not tainted 4.19.138-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27824 10004 6909 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 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+0x60c/0x6f0 kernel/rcu/tree_exp.h:667 synchronize_net+0x37/0x50 net/core/dev.c:9265 nfnetlink_net_exit_batch+0x94/0x150 net/netfilter/nfnetlink.c:608 ops_exit_list+0xf9/0x150 net/core/net_namespace.c:156 setup_net+0x3d1/0x720 net/core/net_namespace.c:332 copy_net_ns+0x1f7/0x335 net/core/net_namespace.c:438 create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107 copy_namespaces+0x325/0x3c0 kernel/nsproxy.c:165 copy_process.part.0+0x3e13/0x7f40 kernel/fork.c:1900 copy_process kernel/fork.c:1694 [inline] _do_fork+0x22f/0xf30 kernel/fork.c:2207 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ccd9 Code: 6c 24 38 48 83 c4 40 c3 31 c0 eb ee b8 01 00 00 00 eb e7 48 8b 44 24 30 48 89 04 24 48 8d 0d 55 fd 4c 00 48 89 4c 24 08 48 c7 <44> 24 10 08 00 00 00 e8 6b 56 fa ff 0f b6 4c 24 18 48 8b 44 24 28 RSP: 002b:00007f572682ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000001f00 RCX: 000000000045ccd9 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000064000103 RBP: 000000000078c310 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c2cc R13: 00007ffe2607df1f R14: 00007f572682f9c0 R15: 000000000078c2cc Showing all locks held in the system: 4 locks held by kworker/u4:1/23: 1 lock held by khungtaskd/1076: #0: 00000000e8a9c9b3 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6104: #0: 000000008710315a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.4/10004: #0: 0000000057937e14 (pernet_ops_rwsem){++++}, at: copy_net_ns+0x1d8/0x335 net/core/net_namespace.c:434 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1076 Comm: khungtaskd Not tainted 4.19.138-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+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 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+0x991/0xe60 kernel/hung_task.c:287 kthread+0x30b/0x410 kernel/kthread.c:246 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: 10 Comm: rcu_preempt Not tainted 4.19.138-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lockdep_hardirqs_off+0x44/0x2c0 kernel/locking/lockdep.c:2894 Code: 48 89 fd 48 c1 e9 03 53 83 c0 03 0f b6 14 11 65 48 8b 1c 25 40 ee 01 00 38 d0 7c 08 84 d2 0f 85 02 02 00 00 8b 3d 8c cd ca 07 <85> ff 0f 84 97 01 00 00 65 4c 8b 24 25 40 ee 01 00 49 8d bc 24 84 RSP: 0018:ffff8880a9f17b18 EFLAGS: 00000097 RAX: 0000000000000003 RBX: ffff8880a9f04280 RCX: 1ffffffff1238d04 RDX: 0000000000000004 RSI: ffffffff816ee614 RDI: 0000000000000001 RBP: ffffffff873d4486 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000286 R13: ffff8880a9f17cc0 R14: ffffed10153e2f9c R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fee717ab008 CR3: 0000000093f7e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] _raw_spin_lock_irqsave+0x66/0xc0 kernel/locking/spinlock.c:152 lock_timer_base+0x55/0x1b0 kernel/time/timer.c:950 try_to_del_timer_sync+0x7a/0x110 kernel/time/timer.c:1237 del_timer_sync+0x1a4/0x270 kernel/time/timer.c:1305 schedule_timeout+0x4d7/0xfe0 kernel/time/timer.c:1826 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415