Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout INFO: task syz-executor.1:9791 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28728 9791 7984 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 __rwsem_down_write_failed_common syzkaller/managers/linux-4-14/kernel/kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x343/0x6d0 syzkaller/managers/linux-4-14/kernel/kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 syzkaller/managers/linux-4-14/kernel/arch/x86/lib/rwsem.S:105 __down_write syzkaller/managers/linux-4-14/kernel/./arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 syzkaller/managers/linux-4-14/kernel/kernel/locking/rwsem.c:56 grab_super+0x55/0x140 syzkaller/managers/linux-4-14/kernel/fs/super.c:373 sget_userns+0x2b1/0xc10 syzkaller/managers/linux-4-14/kernel/fs/super.c:504 sget+0xd1/0x110 syzkaller/managers/linux-4-14/kernel/fs/super.c:572 mount_bdev+0xcd/0x360 syzkaller/managers/linux-4-14/kernel/fs/super.c:1107 mount_fs+0x92/0x2a0 syzkaller/managers/linux-4-14/kernel/fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1046 vfs_kern_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1036 [inline] do_new_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2879 SYSC_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465d99 RSP: 002b:00007f5b36679188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465d99 RDX: 0000000020000000 RSI: 00000000200001c0 RDI: 0000000020000240 RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007fff182f19bf R14: 00007f5b36679300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1530: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:4548 2 locks held by syz-executor.1/9791: #0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [] mount_bdev+0x71/0x360 syzkaller/managers/linux-4-14/kernel/fs/super.c:1101 #1: (&type->s_umount_key#52){+.+.}, at: [] grab_super+0x55/0x140 syzkaller/managers/linux-4-14/kernel/fs/super.c:373 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1530 Comm: khungtaskd Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/linux-4-14/kernel/./include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:274 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8 Comm: rcu_preempt Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b5414200 task.stack: ffff8880b5418000 RIP: 0010:__read_once_size syzkaller/managers/linux-4-14/kernel/./include/linux/compiler.h:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x1d/0x50 syzkaller/managers/linux-4-14/kernel/kernel/kcov.c:67 RSP: 0018:ffff8880b541fc70 EFLAGS: 00000046 RAX: ffff8880b5414200 RBX: ffff8880b541fd18 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880b5414a4c RBP: ffff8880b541fd48 R08: ffffffff8b9ada48 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000297 R13: ffff8880ba522ac0 R14: ffff8880b541fd18 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f671446b008 CR3: 00000000a2116000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: del_timer_sync+0x93/0x240 syzkaller/managers/linux-4-14/kernel/kernel/time/timer.c:1236 schedule_timeout+0x4b7/0xe90 syzkaller/managers/linux-4-14/kernel/kernel/time/timer.c:1748 rcu_gp_kthread+0xc0a/0x1e60 syzkaller/managers/linux-4-14/kernel/kernel/rcu/tree.c:2255 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 80 df 01 00 48 85 c0 74 1a 65 8b 15 5b c0 ac 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