INFO: task syz-executor.3:7384 blocked for more than 143 seconds. Not tainted 5.3.0-rc7+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28608 7384 1748 0x00004004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:3947 schedule_timeout+0x440/0xb20 kernel/time/timer.c:1807 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion_timeout+0x282/0x3e0 kernel/sched/completion.c:155 usb_start_wait_urb+0x14b/0x2b0 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:101 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152 ld_usb_write+0x856/0xa10 drivers/usb/misc/ldusb.c:577 __vfs_write+0x76/0x100 fs/read_write.c:494 vfs_write+0x262/0x5c0 fs/read_write.c:558 ksys_write+0x1e8/0x250 fs/read_write.c:611 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598e9 Code: 70 c0 00 48 83 fb 10 7c 54 48 89 f7 48 83 fb 20 0f 87 8d 00 00 00 48 8d 44 1e f0 eb 15 f3 0f 6f 0f 66 0f 74 c8 66 0f d7 d1 0f d2 75 25 48 83 c7 10 48 39 c7 72 e6 48 89 c7 f3 0f 6f 08 66 0f RSP: 002b:00007f68d3be3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9 RDX: 00000000000000e1 RSI: 0000000020000f00 RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f68d3be46d4 R13: 00000000004c9a9b R14: 00000000004e11a8 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: 00000000d6e11535 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5254 1 lock held by rsyslogd/1607: #0: 000000000b1152f5 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:801 2 locks held by getty/1697: #0: 000000008db07cec (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000037a6f24d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1699: #0: 00000000f47fcacf (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000e275e7f6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1700: #0: 00000000fb29e675 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000008a6be316 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1701: #0: 00000000a801b96b (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000005aff49b2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1702: #0: 0000000008f4e67e (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000f222b72a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1703: #0: 000000009fbcdf53 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000000da0818 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1704: #0: 0000000088d504e5 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000007053af6f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/7384: #0: 000000009743a915 (&dev->mutex#3){+.+.}, at: ld_usb_write+0x111/0xa10 drivers/usb/misc/ldusb.c:539 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.3.0-rc7+ #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+0xca/0x13e lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x9a4/0xe50 kernel/hung_task.c:289 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1728 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_lockdep_rcu_enabled+0x5a/0x90 kernel/rcu/update.c:236 Code: 85 d2 74 39 48 c7 c0 b4 f6 89 87 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 04 <84> d2 75 20 8b 05 20 4b 5e 06 85 c0 74 05 e9 43 ff ff ff 31 c0 c3 RSP: 0018:ffff8881d34c77b8 EFLAGS: 00000002 RAX: 0000000000000007 RBX: 1ffff1103a698efb RCX: 1ffffffff0f13ed6 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8789e738 RBP: ffff8881db232dd8 R08: ffffffff88d20c00 R09: fffffbfff0f13ce8 R10: fffffbfff0f13ce7 R11: ffffffff8789e73f R12: ffffffff811d83cd R13: ffff8881d4bfb000 R14: 0000000000000000 R15: 0000000000000000 FS: 000000c420040c90(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001d3b2c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4ec/0x6b0 kernel/locking/lockdep.c:4430 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:166 [inline] _raw_spin_unlock_irq+0x17/0x30 kernel/locking/spinlock.c:199 finish_lock_switch kernel/sched/core.c:3004 [inline] finish_task_switch+0x11d/0x5a0 kernel/sched/core.c:3104 context_switch kernel/sched/core.c:3257 [inline] __schedule+0x70b/0x1440 kernel/sched/core.c:3880 schedule+0xca/0x250 kernel/sched/core.c:3947 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x2fc/0x5e0 kernel/futex.c:2629 futex_wait+0x1f3/0x5a0 kernel/futex.c:2735 do_futex+0x15d/0x1b80 kernel/futex.c:3646 __do_sys_futex kernel/futex.c:3707 [inline] __se_sys_futex kernel/futex.c:3675 [inline] __x64_sys_futex+0x376/0x4f0 kernel/futex.c:3675 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b153 Code: cc cc cc cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 4c 8b 54 24 18 4c 8b 44 24 20 44 8b 4c 24 28 b8 ca 00 00 00 0f 05 <89> 44 24 30 c3 cc cc cc cc cc cc cc cc 8b 7c 24 08 48 8b 74 24 10 RSP: 002b:000000c4200396a0 EFLAGS: 00000202 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000003b98097c RCX: 000000000045b153 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000017e63a0 RBP: 000000c4200396e8 R08: 0000000000000000 R09: 0000000000000000 R10: 000000c4200396d8 R11: 0000000000000202 R12: 00000069bd7dd742 R13: 0000000000000001 R14: 000000c420138600 R15: 0000000000000001