CUSE: unknown device info "" CUSE: zero length info key specified CUSE: unknown device info "`" CUSE: DEVNAME unspecified INFO: task syz-executor4:14934 blocked for more than 140 seconds. Not tainted 4.20.0-rc6+ #374 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. CUSE: unknown device info "" syz-executor4 D24048 14934 6232 0x00000000 IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 IPVS: stopping master sync thread 28675 ... CUSE: zero length info key specified CUSE: unknown device info "" Call Trace: CUSE: unknown device info "" context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 CUSE: DEVNAME unspecified CUSE: unknown device info "" CUSE: zero length info key specified IPVS: stopping master sync thread 28686 ... CUSE: unknown device info "" IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 CUSE: zero length info key specified CUSE: DEVNAME unspecified schedule+0xfe/0x460 kernel/sched/core.c:3516 d_wait_lookup fs/dcache.c:2408 [inline] d_alloc_parallel+0x1478/0x1f40 fs/dcache.c:2490 CUSE: unknown device info "" CUSE: unknown device info "" CUSE: unknown device info "" CUSE: zero length info key specified CUSE: zero length info key specified CUSE: DEVNAME unspecified CUSE: unknown device info "" CUSE: unknown device info "" CUSE: unknown device info "" CUSE: zero length info key specified CUSE: DEVNAME unspecified IPVS: stopping master sync thread 28711 ... IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 CUSE: zero length info key specified IPVS: stopping master sync thread 28714 ... Unknown ioctl 1074816016 IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 __lookup_slow+0x1e6/0x540 fs/namei.c:1654 lookup_slow+0x57/0x80 fs/namei.c:1688 walk_component+0x92b/0x2590 fs/namei.c:1810 CUSE: DEVNAME unspecified CUSE: DEVNAME unspecified CUSE: unknown device info "" CUSE: unknown device info "" CUSE: zero length info key specified CUSE: zero length info key specified CUSE: unknown device info "" CUSE: unknown device info "" CUSE: zero length info key specified CUSE: zero length info key specified link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141 IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 IPVS: stopping master sync thread 28732 ... CUSE: DEVNAME unspecified CUSE: DEVNAME unspecified link_path_walk fs/namei.c:2269 [inline] path_lookupat.isra.43+0xf7/0xc00 fs/namei.c:2317 IPVS: stopping master sync thread 28737 ... IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 CUSE: unknown device info "" filename_lookup+0x26a/0x520 fs/namei.c:2348 CUSE: zero length info key specified CUSE: unknown device info "" cgroup: fork rejected by pids controller in /syz1 CUSE: zero length info key specified user_path_at_empty+0x40/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x129/0x210 fs/stat.c:185 vfs_lstat include/linux/fs.h:3170 [inline] __do_sys_newlstat+0x8f/0x110 fs/stat.c:352 __se_sys_newlstat fs/stat.c:346 [inline] __x64_sys_newlstat+0x54/0x80 fs/stat.c:346 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: Bad RIP value. RSP: 002b:00007fe3a9c93c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000600 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe3a9c946d4 R13: 00000000004c2ca2 R14: 00000000004d4ee0 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1020: #0: 0000000048b8a428 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 1 lock held by rsyslogd/5995: 2 locks held by getty/6085: #0: 000000000aed14d7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000004e6151a1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6086: #0: 000000003cd46f76 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000005ff7f983 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6087: #0: 000000000af13711 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000ccd09fdc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6088: #0: 00000000e7dc0577 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000052006105 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6089: #0: 000000008c8e1289 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000de535a4b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6090: #0: 000000003cc69935 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000b1653710 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6091: #0: 000000007cb5e39c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000005fe41224 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 1 lock held by syz-executor4/14934: #0: 00000000ba33812c (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:767 [inline] #0: 00000000ba33812c (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 2 locks held by syz-executor4/14979: #0: 00000000ba33812c (&type->i_mutex_dir_key#8){++++}, at: inode_lock_shared include/linux/fs.h:767 [inline] #0: 00000000ba33812c (&type->i_mutex_dir_key#8){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 #1: 00000000b65f48ae (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:364 1 lock held by syz-executor1/28690: #0: 00000000a67f76da (event_mutex){+.+.}, at: perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:236 ============================================= CUSE: DEVNAME unspecified CUSE: unknown device info "" NMI backtrace for cpu 0 IPVS: stopping master sync thread 28758 ... CPU: 0 PID: 1020 Comm: khungtaskd Not tainted 4.20.0-rc6+ #374 CUSE: zero length info key specified 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:146 [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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6158 Comm: syz-executor2 Not tainted 4.20.0-rc6+ #374 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:lock_acquire+0x18d/0x520 kernel/locking/lockdep.c:3843 Code: e9 03 0f b6 0c 01 48 89 f8 83 e0 07 83 c0 03 38 c8 7c 08 84 c9 0f 85 c5 02 00 00 c7 82 7c 08 00 00 01 00 00 00 cc 1f 44 00 00 <65> 8b 05 5c ac 9f 7e 83 f8 3f 0f 87 87 02 00 00 89 c0 48 0f a3 05 RSP: 0018:ffff8881c2dff448 EFLAGS: 00000046 RAX: 0000000000000007 RBX: 1ffff110385bfe8e RCX: 0000000000000000 RDX: ffff8881c2df44c0 RSI: 0000000000000000 RDI: ffff8881c2df4d3c RBP: ffff8881c2dff538 R08: 0000000000000001 R09: 0000000000000000 R10: ffffed103b5e5908 R11: ffff8881daf2c843 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000001179940(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd03bd1020 CR3: 00000001c2c0c000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 try_to_wake_up+0xdc/0x1440 kernel/sched/core.c:1965 wake_up_process+0x10/0x20 kernel/sched/core.c:2129 wake_up_worker+0x112/0x190 kernel/workqueue.c:838 insert_work+0x3d8/0x4c0 kernel/workqueue.c:1311 __queue_work+0x64e/0x1440 kernel/workqueue.c:1461 queue_work_on+0x19a/0x1e0 kernel/workqueue.c:1486 queue_work include/linux/workqueue.h:512 [inline] schedule_work include/linux/workqueue.h:570 [inline] free_object lib/debugobjects.c:273 [inline] debug_object_free+0x36f/0x690 lib/debugobjects.c:652 destroy_hrtimer_on_stack kernel/time/hrtimer.c:442 [inline] hrtimer_nanosleep+0x304/0x620 kernel/time/hrtimer.c:1757 __do_sys_nanosleep kernel/time/hrtimer.c:1776 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1763 [inline] __x64_sys_nanosleep+0x1e7/0x280 kernel/time/hrtimer.c:1763 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x483160 Code: 00 00 48 c7 c0 d4 ff ff ff 64 c7 00 16 00 00 00 31 c0 eb be 66 0f 1f 44 00 00 83 3d 11 33 5c 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 d4 f8 f8 ff c3 48 83 ec 08 e8 ba 70 fd ff RSP: 002b:0000000000a3fd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 0000000000079a42 RCX: 0000000000483160 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a3fd80 RBP: 0000000000000806 R08: 0000000000000001 R09: 0000000001179940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000079a15 R14: 0000000000000234 R15: 0000000000000002 CUSE: DEVNAME unspecified CUSE: unknown device info "" CUSE: unknown device info "" kobject: 'loop2' (0000000072b596a7): kobject_uevent_env kobject: 'loop2' (0000000072b596a7): fill_kobj_path: path = '/devices/virtual/block/loop2' CUSE: zero length info key specified kobject: 'loop4' (000000006c261a1f): kobject_uevent_env CUSE: zero length info key specified IPVS: stopping master sync thread 28774 ... CUSE: unknown device info "" kobject: 'loop4' (000000006c261a1f): fill_kobj_path: path = '/devices/virtual/block/loop4' CUSE: zero length info key specified IPVS: stopping master sync thread 28780 ...