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.2:9839 blocked for more than 140 seconds. Not tainted 4.19.154-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28696 9839 8144 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 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1801 __down_common kernel/locking/semaphore.c:221 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:238 down+0x57/0x80 kernel/locking/semaphore.c:62 console_lock+0x25/0x80 kernel/printk/printk.c:2275 do_fb_ioctl+0x33e/0xb50 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1230 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45deb9 Code: f9 00 48 8d 15 88 7e 61 01 48 89 14 24 e8 cf ce fa ff 0f b6 44 24 2f 3c 00 0f 85 10 01 00 00 e8 7d 7e fd ff 48 8d 05 ba 45 50 <00> 48 89 04 24 48 c7 44 24 08 11 00 00 00 e8 a4 87 fd ff 8b 44 24 RSP: 002b:00007f9fdc9f9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e300 RCX: 000000000045deb9 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004 RBP: 000000000118c008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4 R13: 00007ffc841e91bf R14: 00007f9fdc9fa9c0 R15: 000000000118bfd4 Showing all locks held in the system: 1 lock held by khungtaskd/1566: #0: 000000009fb88021 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/7807: #0: 0000000045419e56 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 5 locks held by syz-executor.3/9772: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1566 Comm: khungtaskd Not tainted 4.19.154-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+0x33f/0x460 kernel/kthread.c:259 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: 9772 Comm: syz-executor.3 Not tainted 4.19.154-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x50 kernel/kcov.c:106 Code: 65 8b 15 fc 0f 9d 7e 81 e2 00 01 1f 00 75 2b 8b 90 d8 12 00 00 83 fa 02 75 20 48 8b 88 e0 12 00 00 8b 80 dc 12 00 00 48 8b 11 <48> 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 RSP: 0018:ffff888055c570b0 EFLAGS: 00000246 RAX: 0000000000040000 RBX: 0000000000000050 RCX: ffffc9000c14a000 RDX: 000000000003ffff RSI: ffffffff83a82f40 RDI: 0000000000000004 RBP: 0000000000000036 R08: 0000000000000010 R09: 0000000000000050 R10: 0000000000000004 R11: 0000000000000000 R12: ffff8880000a0036 R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000ee1226c5 FS: 00007f10adbd3700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558b70805ed8 CR3: 00000000b074a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: writeb arch/x86/include/asm/io.h:65 [inline] vga16fb_fillrect+0x9c0/0x1940 drivers/video/fbdev/vga16fb.c:923 bit_clear+0x382/0x4d0 drivers/video/fbdev/core/bitblit.c:74 fbcon_clear+0x5d6/0x690 drivers/video/fbdev/core/fbcon.c:1258 fbcon_scroll+0x42e/0x3440 drivers/video/fbdev/core/fbcon.c:1756 con_scroll+0x5f8/0x720 drivers/tty/vt/vt.c:637 lf+0x262/0x2b0 drivers/tty/vt/vt.c:1491 do_con_write+0x133e/0x1d90 drivers/tty/vt/vt.c:2768 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3145 process_output_block drivers/tty/n_tty.c:593 [inline] n_tty_write+0x3c0/0xff0 drivers/tty/n_tty.c:2331 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x496/0x810 drivers/tty/tty_io.c:1044 __vfs_write+0xf7/0x770 fs/read_write.c:485 __kernel_write+0x109/0x370 fs/read_write.c:506 write_pipe_buf+0x153/0x1f0 fs/splice.c:798 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x389/0x800 fs/splice.c:627 splice_from_pipe fs/splice.c:662 [inline] default_file_splice_write+0xd8/0x180 fs/splice.c:810 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1025 splice_direct_to_actor+0x33f/0x8d0 fs/splice.c:980 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45deb9 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f10adbd2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000027f40 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000009 RBP: 000000000118bf68 R08: 0000000000000000 R09: 0000000000000000 R10: 0800000080004103 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffdc81744cf R14: 00007f10adbd39c0 R15: 000000000118bf2c