Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout INFO: task systemd-udevd:11454 blocked for more than 140 seconds. Not tainted 4.14.285-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28712 11454 4627 0x00000304 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 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 blkdev_get+0x88/0x890 fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f038ee9b840 RSP: 002b:00007fff90d179f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055810d35f7c0 RCX: 00007f038ee9b840 RDX: 000055810b713fe3 RSI: 00000000000a0800 RDI: 000055810d35ffd0 RBP: 00007fff90d17b70 R08: 000055810b713670 R09: 0000000000000010 R10: 000055810b713d0c R11: 0000000000000246 R12: 00007fff90d17ac0 R13: 000055810d35fda0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.5:11464 blocked for more than 140 seconds. Not tainted 4.14.285-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D26040 11464 8002 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 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 blkdev_get+0x88/0x890 fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f739e0cf109 RSP: 002b:00007f739ca44168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f739e1e1f60 RCX: 00007f739e0cf109 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020004200 RBP: 00007f739e12905d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffd589541f R14: 00007f739ca44300 R15: 0000000000022000 INFO: task syz-executor.5:11481 blocked for more than 140 seconds. Not tainted 4.14.285-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29048 11481 8002 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 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 __blkdev_get+0x6a9/0x1090 fs/block_dev.c:1515 blkdev_get+0x88/0x890 fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f739e0cf109 RSP: 002b:00007f739ca23168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f739e1e2030 RCX: 00007f739e0cf109 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200044c0 RBP: 00007f739e12905d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffd589541f R14: 00007f739ca23300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1535: #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 2 locks held by agetty/7703: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e3/0x1680 drivers/tty/n_tty.c:2156 1 lock held by systemd-udevd/11454: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 1 lock held by syz-executor.5/11464: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 2 locks held by syz-executor.5/11481: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 #1: (&bdev->bd_mutex/1){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1535 Comm: khungtaskd Not tainted 4.14.285-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: 7701 Comm: rs:main Q:Reg Not tainted 4.14.285-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a4f20140 task.stack: ffff8880a4d70000 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:27 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:49 RSP: 0018:ffff8880a4d773c0 EFLAGS: 00000a06 RAX: 1ffffffff1438ef6 RBX: ffffffff8a1c77b0 RCX: ffffffff81bb9961 RDX: 0000000000000000 RSI: ffffffff8a772ae0 RDI: ffffffff8a1c77b0 RBP: ffffffff8a1c77b0 R08: ffffffff8a772ae0 R09: ffffffff8a772ae6 R10: 000000000002b5f8 R11: 0000000000066071 R12: ffffffff8a1c77b0 R13: ffffffff8a1c77b0 R14: ffffffff8a1c77b0 R15: dffffc0000000000 FS: 00007ff5d8c01700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6ca7423000 CR3: 00000000b417f000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:118 [inline] unwind_next_frame+0x59a/0x17d0 arch/x86/kernel/unwind_orc.c:348 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 kmem_cache_zalloc include/linux/slab.h:651 [inline] alloc_buffer_head+0x20/0x110 fs/buffer.c:3429 alloc_page_buffers+0xb3/0x1f0 fs/buffer.c:874 create_empty_buffers+0x36/0x450 fs/buffer.c:1590 create_page_buffers+0x14d/0x1c0 fs/buffer.c:1707 __block_write_begin_int+0x176/0x1090 fs/buffer.c:2017 ext4_da_write_begin+0x402/0xe70 fs/ext4/inode.c:3141 generic_perform_write+0x1c9/0x420 mm/filemap.c:3055 __generic_file_write_iter+0x227/0x590 mm/filemap.c:3180 ext4_file_write_iter+0x276/0xd20 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ff5db6451cd RSP: 002b:00007ff5d8c00590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff5d000c7c0 RCX: 00007ff5db6451cd RDX: 000000000000040a RSI: 00007ff5d000c7c0 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007ff5d000c520 R13: 00007ff5d8c005b0 R14: 000055b051f507c0 R15: 000000000000040a Code: ec 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 ---------------- Code disassembly (best guess): 0: ec in (%dx),%al 1: 72 4d jb 0x50 3: 4c 89 e0 mov %r12,%rax 6: 48 29 e8 sub %rbp,%rax 9: 48 89 c2 mov %rax,%rdx c: 48 c1 e8 3f shr $0x3f,%rax 10: 48 c1 fa 02 sar $0x2,%rdx 14: 48 01 d0 add %rdx,%rax 17: 48 d1 f8 sar %rax 1a: 48 8d 5c 85 00 lea 0x0(%rbp,%rax,4),%rbx 1f: 48 89 d8 mov %rbx,%rax 22: 48 c1 e8 03 shr $0x3,%rax 26: 42 0f b6 14 38 movzbl (%rax,%r15,1),%edx * 2b: 48 89 d8 mov %rbx,%rax <-- trapping instruction 2e: 83 e0 07 and $0x7,%eax 31: 83 c0 03 add $0x3,%eax 34: 38 d0 cmp %dl,%al 36: 7c 04 jl 0x3c 38: 84 d2 test %dl,%dl 3a: 75 48 jne 0x84 3c: 48 63 03 movslq (%rbx),%rax 3f: 48 rex.W