hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: hidraw0: HID v0.00 Device [syz1] on syz1 INFO: task syz-executor4:5838 blocked for more than 140 seconds. Not tainted 4.20.0-rc1+ #327 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D18568 5838 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:364 fuse_lookup+0x8f/0x3a0 fs/fuse/dir.c:350 __lookup_slow+0x2b5/0x540 fs/namei.c:1671 lookup_slow+0x57/0x80 fs/namei.c:1688 walk_component+0x92b/0x2590 fs/namei.c:1810 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_mountpoint+0x103/0x2180 fs/namei.c:2694 filename_mountpoint+0x245/0x460 fs/namei.c:2717 user_path_mountpoint_at+0x37/0x40 fs/namei.c:2747 ksys_umount+0x1c9/0x12a0 fs/namespace.c:1639 __do_sys_umount fs/namespace.c:1665 [inline] __se_sys_umount fs/namespace.c:1663 [inline] __x64_sys_umount+0x54/0x80 fs/namespace.c:1663 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459fb7 Code: Bad RIP value. RSP: 002b:00007ffc60e17698 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000043b1c RCX: 0000000000459fb7 RDX: 0000000000402e70 RSI: 0000000000000002 RDI: 00007ffc60e17740 RBP: 0000000000000119 R08: 0000000000000000 R09: 000000000000000f R10: 000000000000000a R11: 0000000000000206 R12: 00007ffc60e187d0 R13: 0000000002723940 R14: 0000000000000000 R15: 0000000000000004 Showing all locks held in the system: 1 lock held by khungtaskd/1007: #0: 00000000d990c94e (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 1 lock held by rsyslogd/5603: #0: 000000002867c95e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5693: #0: 0000000030a28a0e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000ec0a614c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5694: #0: 000000004169d0a9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000096b2d324 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5695: #0: 00000000d46420ba (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000f0771aeb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5696: #0: 0000000018b8d834 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000bcfe8596 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5697: #0: 000000003fb59346 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000076cea4c2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5698: #0: 000000002da44ccd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000077e04b6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5699: #0: 00000000e07390dd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000006aa6d03a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by syz-executor4/5838: #0: 000000003933a71b (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:767 [inline] #0: 000000003933a71b (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 #1: 000000000731b5ba (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:364 2 locks held by syz-executor4/7549: #0: 000000003933a71b (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:767 [inline] #0: 000000003933a71b (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 #1: 000000000731b5ba (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:364 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1007 Comm: khungtaskd Not tainted 4.20.0-rc1+ #327 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+0x244/0x39d lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xb51/0x1060 kernel/hung_task.c:289 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57