INFO: task syz-executor6:15463 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc8+ #31
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6   D14408 15463   4058 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2857 [inline]
 __schedule+0x62a/0x870 kernel/sched/core.c:3507
 schedule kernel/sched/core.c:3551 [inline]
 schedule_preempt_disabled+0x57/0x80 kernel/sched/core.c:3609
 __mutex_lock_common kernel/locking/mutex.c:834 [inline]
 __mutex_lock+0x1ed/0x420 kernel/locking/mutex.c:894
 __mutex_lock_slowpath+0xe/0x10 kernel/locking/mutex.c:1155
 mutex_lock+0x34/0x40 kernel/locking/mutex.c:242
 fuse_lock_inode+0x35/0x40 fs/fuse/inode.c:363
 fuse_lookup+0x27/0x150 fs/fuse/dir.c:359
 __lookup_slow+0x105/0x190 fs/namei.c:1630
 lookup_slow fs/namei.c:1647 [inline]
 walk_component+0x107/0x210 fs/namei.c:1769
 lookup_last fs/namei.c:2237 [inline]
 path_lookupat+0x1bf/0x360 fs/namei.c:2287
 filename_lookup+0xbb/0x280 fs/namei.c:2321
 user_path_at_empty+0x40/0x50 fs/namei.c:2584
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx fs/stat.c:185 [inline]
 vfs_stat include/linux/fs.h:3102 [inline]
 __do_sys_newstat fs/stat.c:337 [inline]
 __se_sys_newstat+0x41/0x270 fs/stat.c:333
 __x64_sys_newstat+0x1a/0x20 fs/stat.c:333
 do_syscall_64+0x61/0x90 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x456c99
Code: 8b 52 20 48 89 0c 24 48 89 5c 24 08 48 89 54 24 10 e8 1b a8 fb ff 8b 05 45 75 01 01 48 8b 4c 24 18 85 c0 75 12 48 8b 44 24 20 <48> 89 08 48 8b 6c 24 28 48 83 c4 30 c3 48 8b 44 24 20 48 89 04 24 
RSP: 002b:00007f6fb2e4fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00007f6fb2e506d4 RCX: 0000000000456c99
RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000020000180
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d59c8 R14: 00000000004dbc9b R15: 0000000000000001
NMI backtrace for cpu 0
CPU: 0 PID: 677 Comm: khungtaskd Not tainted 4.18.0-rc8+ #31
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+0xae/0xf0 lib/dump_stack.c:113
 nmi_cpu_backtrace lib/nmi_backtrace.c:103 [inline]
 nmi_trigger_cpumask_backtrace+0xdd/0x1e0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:138
 check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline]
 watchdog+0x4be/0x4d0 kernel/hung_task.c:252
 kthread+0x127/0x140 kernel/kthread.c:247
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:55 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:97 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0x76/0xf0 arch/x86/kernel/process.c:500