INFO: task syz-executor1:31869 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc8+ #32
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D13784 31869   4053 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]
 path_removexattr+0x3c/0x150 fs/xattr.c:700
 __do_sys_lremovexattr fs/xattr.c:725 [inline]
 __se_sys_lremovexattr fs/xattr.c:722 [inline]
 __x64_sys_lremovexattr+0x1c/0x30 fs/xattr.c:722
 do_syscall_64+0x61/0x90 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x456d89
Code: 08 00 01 48 8b 3d 87 08 00 01 49 89 c8 48 29 d9 48 c1 e9 0d 48 39 f9 73 2e 48 8b 0c ce 48 85 c9 74 09 48 8b 59 18 49 39 d8 73 <05> 4c 89 c1 eb 90 48 8b 99 80 00 00 00 49 39 d8 73 ef 0f b6 49 64 
RSP: 002b:00007fe86ac21c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6
RAX: ffffffffffffffda RBX: 00007fe86ac226d4 RCX: 0000000000456d89
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000020000040
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d1cf0 R14: 00000000004c75a2 R15: 0000000000000001
NMI backtrace for cpu 0
CPU: 0 PID: 678 Comm: khungtaskd Not tainted 4.18.0-rc8+ #32
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