Bluetooth: hci3: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout INFO: task syz-executor.1:10785 blocked for more than 140 seconds. Not tainted 4.19.146-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28200 10785 6520 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0xa2e/0x1320 kernel/time/timer.c:1801 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 flush_workqueue+0x435/0x1410 kernel/workqueue.c:2715 nbd_start_device_ioctl drivers/block/nbd.c:1267 [inline] __nbd_ioctl drivers/block/nbd.c:1338 [inline] nbd_ioctl+0x7f1/0xc90 drivers/block/nbd.c:1378 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x5cb/0x1a7e block/ioctl.c:601 block_ioctl+0xe9/0x130 fs/block_dev.c:1896 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+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d5f9 Code: Bad RIP value. RSP: 002b:00007f009b5e4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000012a40 RCX: 000000000045d5f9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000118d0b8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d08c R13: 00007ffc6018335f R14: 00007f009b5e59c0 R15: 000000000118d08c Showing all locks held in the system: 1 lock held by khungtaskd/1095: #0: 00000000ad1b6543 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x291 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6178: #0: 0000000016d07dd3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767 2 locks held by kworker/u5:5/6552: #0: 00000000e5ea2693 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: process_one_work+0x692/0x14e0 kernel/workqueue.c:2126 #1: 0000000001023757 ((work_completion)(&args->work)){+.+.}, at: process_one_work+0x6c8/0x14e0 kernel/workqueue.c:2130 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1095 Comm: khungtaskd Not tainted 4.19.146-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+0x22c/0x33e lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x18/0x3d 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+0xa62/0x1020 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: 3710 Comm: systemd-journal Not tainted 4.19.146-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x214/0x3ff0 kernel/locking/lockdep.c:3325 Code: 20 8b 2d 8d 45 8b 9e 80 08 00 00 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 0f b6 0c 11 48 c7 c2 20 8b 2d 8d 83 e2 07 83 c2 03 <38> ca 7c 08 84 c9 0f 85 16 2a 00 00 41 83 fb 2f 44 8b 2d 35 fa d5 RSP: 0018:ffff888093dd7ad0 EFLAGS: 00000006 RAX: ffff888093dcaf80 RBX: 0000000000000000 RCX: 0000000000000004 RDX: 0000000000000003 RSI: 0000000000000004 RDI: ffffffff8cdf49f8 RBP: 0000000000000000 R08: ffffffff8cdf48c0 R09: fffffbfff19be93f R10: ffffffff8cdf49fb R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff888093dca700 R15: ffffffff8d446760 FS: 00007f76a46398c0(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f76a1b42018 CR3: 0000000093e1e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3907 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x90/0xe0 kernel/locking/spinlock.c:152 __debug_check_no_obj_freed lib/debugobjects.c:776 [inline] debug_check_no_obj_freed+0xb5/0x482 lib/debugobjects.c:817 kfree+0xb9/0x250 mm/slab.c:3821 security_cred_free+0x6d/0xb0 security/security.c:1009 put_cred_rcu+0x122/0x4a0 kernel/cred.c:117 __put_cred+0x1de/0x280 kernel/cred.c:151 put_cred include/linux/cred.h:276 [inline] do_faccessat+0x691/0x7f0 fs/open.c:438 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f76a38f59c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff3561bdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007fff3561edf0 RCX: 00007f76a38f59c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055d15fa0a9a3 RBP: 00007fff3561bf10 R08: 000055d15fa003e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000055d1609a58c0 R15: 00007fff3561c400