Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci0: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout INFO: task syz-executor.1:9498 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28488 9498 8116 0x00000004 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 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 grab_super+0xa2/0x350 fs/super.c:383 sget_userns+0x352/0xcd0 fs/super.c:511 sget+0x102/0x140 fs/super.c:570 mount_bdev+0xf8/0x3b0 fs/super.c:1131 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f72cda2aae9 Code: Bad RIP value. RSP: 002b:00007f72caf7f188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f72cdb3e020 RCX: 00007f72cda2aae9 RDX: 0000000020000180 RSI: 0000000020000140 RDI: 0000000020000100 RBP: 00007f72cda84f6d R08: 00000000200001c0 R09: 0000000000000000 R10: 0000000001000004 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd117d809f R14: 00007f72caf7f300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1562: #0: 0000000073d9b855 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7803: #0: 00000000acaa7ea2 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.1/9495: 2 locks held by syz-executor.1/9498: #0: 00000000893ded54 (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x90/0x3b0 fs/super.c:1125 #1: 000000007b28716a (&type->s_umount_key#49){+.+.}, at: grab_super+0xa2/0x350 fs/super.c:383 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1562 Comm: khungtaskd Not tainted 4.19.211-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/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 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+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: kworker/u4:1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:mark_lock+0x2f/0x1160 kernel/locking/lockdep.c:3099 Code: 00 00 fc ff df 41 57 89 d1 41 89 d7 41 56 4c 8d 76 20 4c 89 f2 41 55 49 89 fd 41 54 48 c1 ea 03 41 bc 01 00 00 00 55 41 d3 e4 <48> 89 f5 53 48 83 ec 18 0f b6 04 02 84 c0 74 08 3c 01 0f 8e f1 07 RSP: 0018:ffff8880b5047b98 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 1ffff11016a079d5 RSI: ffff8880b503ce88 RDI: ffff8880b503c600 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 R13: ffff8880b503c600 R14: ffff8880b503cea8 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f29f9a99fd8 CR3: 00000000a1a89000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_held_locks+0xa6/0xf0 kernel/locking/lockdep.c:2810 __trace_hardirqs_on_caller kernel/locking/lockdep.c:2831 [inline] lockdep_hardirqs_on+0x288/0x5c0 kernel/locking/lockdep.c:2884 __local_bh_enable_ip+0x159/0x270 kernel/softirq.c:194 spin_unlock_bh include/linux/spinlock.h:374 [inline] batadv_nc_purge_paths+0x22d/0x310 net/batman-adv/network-coding.c:482 batadv_nc_worker+0x731/0xd50 net/batman-adv/network-coding.c:733 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: df 41 57 filds 0x57(%rcx) 3: 89 d1 mov %edx,%ecx 5: 41 89 d7 mov %edx,%r15d 8: 41 56 push %r14 a: 4c 8d 76 20 lea 0x20(%rsi),%r14 e: 4c 89 f2 mov %r14,%rdx 11: 41 55 push %r13 13: 49 89 fd mov %rdi,%r13 16: 41 54 push %r12 18: 48 c1 ea 03 shr $0x3,%rdx 1c: 41 bc 01 00 00 00 mov $0x1,%r12d 22: 55 push %rbp 23: 41 d3 e4 shl %cl,%r12d * 26: 48 89 f5 mov %rsi,%rbp <-- trapping instruction 29: 53 push %rbx 2a: 48 83 ec 18 sub $0x18,%rsp 2e: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 32: 84 c0 test %al,%al 34: 74 08 je 0x3e 36: 3c 01 cmp $0x1,%al 38: 0f .byte 0xf 39: 8e f1 mov %ecx,%? 3b: 07 (bad)