Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout INFO: task syz-executor.0:9894 blocked for more than 140 seconds. Not tainted 4.14.282-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D26720 9894 8005 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x343/0x6d0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write_nested+0x51/0x90 kernel/locking/rwsem.c:174 inode_lock_nested include/linux/fs.h:754 [inline] lock_rename+0xd4/0x280 fs/namei.c:2894 SYSC_renameat2 fs/namei.c:4594 [inline] SyS_renameat2+0x5ab/0xad0 fs/namei.c:4533 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fe98c6fd109 RSP: 002b:00007fe98b072168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007fe98c80ff60 RCX: 00007fe98c6fd109 RDX: 0000000000000006 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 00007fe98c7570ad R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcd36308cf R14: 00007fe98b072300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1534: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7700: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 4 locks held by syz-executor.0/9894: #0: (sb_writers#13){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#13){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&type->s_vfs_rename_key){+.+.}, at: [] lock_rename+0x54/0x280 fs/namei.c:2889 #2: (&type->i_mutex_dir_key#8/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #2: (&type->i_mutex_dir_key#8/1){+.+.}, at: [] lock_rename+0xa0/0x280 fs/namei.c:2893 #3: (&type->i_mutex_dir_key#8/2){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #3: (&type->i_mutex_dir_key#8/2){+.+.}, at: [] lock_rename+0xd4/0x280 fs/namei.c:2894 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.282-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+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.14.282-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_long gc_worker task: ffff8880b5fe80c0 task.stack: ffff8880b5ff0000 RIP: 0010:task_irq_context kernel/locking/lockdep.c:3101 [inline] RIP: 0010:__lock_acquire+0x435/0x3f20 kernel/locking/lockdep.c:3436 RSP: 0018:ffff8880b5ff7ab0 EFLAGS: 00000803 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 1ffff11016bfd132 RDI: ffff8880b5fe8934 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: ffff8880b5fe8998 R11: ffff8880b5fe80c0 R12: ffff8880b5fe89b0 R13: 0000000000000012 R14: 0000000000000012 R15: ffffffff8bed1d40 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6be0d28000 CR3: 00000000a1e75000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] gc_worker+0x12e/0xb50 net/netfilter/nf_conntrack_core.c:1084 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 83 54 08 00 00 49 8d bb 74 08 00 00 ba 02 00 00 00 48 89 f9 85 c0 0f 45 c2 48 c1 e9 03 48 ba 00 00 00 00 00 fc ff df 0f b6 0c 11 <48> 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 dd 25 00 00 ---------------- Code disassembly (best guess): 0: 83 54 08 00 00 adcl $0x0,0x0(%rax,%rcx,1) 5: 49 8d bb 74 08 00 00 lea 0x874(%r11),%rdi c: ba 02 00 00 00 mov $0x2,%edx 11: 48 89 f9 mov %rdi,%rcx 14: 85 c0 test %eax,%eax 16: 0f 45 c2 cmovne %edx,%eax 19: 48 c1 e9 03 shr $0x3,%rcx 1d: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 24: fc ff df 27: 0f b6 0c 11 movzbl (%rcx,%rdx,1),%ecx * 2b: 48 89 fa mov %rdi,%rdx <-- trapping instruction 2e: 83 e2 07 and $0x7,%edx 31: 83 c2 03 add $0x3,%edx 34: 38 ca cmp %cl,%dl 36: 7c 08 jl 0x40 38: 84 c9 test %cl,%cl 3a: 0f 85 dd 25 00 00 jne 0x261d