Hello,

syzbot found the following crash on:

HEAD commit:    ee1c7bd3 Merge tag 'tpmdd-next-20190813' of git://git.infr..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=153f3422600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3ff364e429585cf2
dashboard link: https://syzkaller.appspot.com/bug?extid=b64df836ad08c8e31a47
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=176c385a600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12482e86600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b64df836ad08c8e31...@syzkaller.appspotmail.com

INFO: task init:1 blocked for more than 143 seconds.
      Not tainted 5.3.0-rc4+ #101
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D23792     1      0 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xa8/0x270 kernel/sched/core.c:3944
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4003
 __mutex_lock_common kernel/locking/mutex.c:1007 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1077
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1092
 fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:362
 fuse_lookup+0x8e/0x360 fs/fuse/dir.c:335
 __lookup_slow+0x279/0x500 fs/namei.c:1669
 lookup_slow+0x58/0x80 fs/namei.c:1686
 walk_component+0x747/0x2000 fs/namei.c:1808
 link_path_walk.part.0+0x9a4/0x1340 fs/namei.c:2139
 link_path_walk fs/namei.c:2267 [inline]
 path_lookupat.isra.0+0xe3/0x8d0 fs/namei.c:2315
 filename_lookup+0x1b0/0x410 fs/namei.c:2346
 user_path_at_empty+0x43/0x50 fs/namei.c:2606
 user_path_at include/linux/namei.h:60 [inline]
 vfs_statx+0x129/0x200 fs/stat.c:187
 vfs_stat include/linux/fs.h:3188 [inline]
 __do_sys_newstat+0xa4/0x130 fs/stat.c:341
 __se_sys_newstat fs/stat.c:337 [inline]
 __x64_sys_newstat+0x54/0x80 fs/stat.c:337
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7eff41718c65
Code: 00 00 00 e8 5d 01 00 00 48 83 c4 18 c3 90 90 90 90 90 90 90 90 83 ff 01 48 89 f0 77 18 48 89 c7 48 89 d6 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 17 f3 c3 90 48 8b 05 a1 51 2b 00 64 c7 00 16
RSP: 002b:00007fff34a35eb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00007fff34a360f0 RCX: 00007eff41718c65
RDX: 00007fff34a360f0 RSI: 00007fff34a360f0 RDI: 0000000000407545
RBP: 0000000000000000 R08: 000000000159cb60 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00007fff34a365f0 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor205:11118 blocked for more than 143 seconds.
      Not tainted 5.3.0-rc4+ #101
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor205 D27656 11118  11116 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xa8/0x270 kernel/sched/core.c:3944
 d_wait_lookup fs/dcache.c:2506 [inline]
 d_alloc_parallel+0x12cd/0x1c30 fs/dcache.c:2588
 __lookup_slow+0x1ab/0x500 fs/namei.c:1652
 lookup_slow+0x58/0x80 fs/namei.c:1686
 walk_component+0x747/0x2000 fs/namei.c:1808
 link_path_walk.part.0+0x9a4/0x1340 fs/namei.c:2139
 link_path_walk fs/namei.c:2070 [inline]
 path_openat+0x202/0x4630 fs/namei.c:3532
 do_filp_open+0x1a1/0x280 fs/namei.c:3563
 do_sys_open+0x3fe/0x5d0 fs/open.c:1089
 __do_sys_open fs/open.c:1107 [inline]
 __se_sys_open fs/open.c:1102 [inline]
 __x64_sys_open+0x7e/0xc0 fs/open.c:1102
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x444ca0
Code: Bad RIP value.
RSP: 002b:00007ffec1436ed0 EFLAGS: 00000202 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444ca0
RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00000000004ae91e
RBP: 0000000000002b72 R08: 0000000000002b6e R09: 0000555556c39880
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffec1437100
R13: 00000000004075d0 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor205:11122 blocked for more than 144 seconds.
      Not tainted 5.3.0-rc4+ #101
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor205 D28336 11122  11118 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xa8/0x270 kernel/sched/core.c:3944
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4003
 __mutex_lock_common kernel/locking/mutex.c:1007 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1077
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1092
 fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:362
 fuse_lookup+0x8e/0x360 fs/fuse/dir.c:335
 __lookup_slow+0x279/0x500 fs/namei.c:1669
 lookup_slow+0x58/0x80 fs/namei.c:1686
 walk_component+0x747/0x2000 fs/namei.c:1808
 link_path_walk.part.0+0x9a4/0x1340 fs/namei.c:2139
 link_path_walk fs/namei.c:2070 [inline]
 path_openat+0x202/0x4630 fs/namei.c:3532
 do_filp_open+0x1a1/0x280 fs/namei.c:3563
 do_sys_open+0x3fe/0x5d0 fs/open.c:1089
 __do_sys_open fs/open.c:1107 [inline]
 __se_sys_open fs/open.c:1102 [inline]
 __x64_sys_open+0x7e/0xc0 fs/open.c:1102
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x405810
Code: 00 48 85 c0 75 e8 8b 15 2e 33 20 00 83 e2 fb 89 15 25 33 20 00 f7 c2 00 00 00 10 74 4b 48 8b 05 c6 30 20 00 48 85 c0 75 15 eb <31> 0f 1f 80 00 00 00 00 48 8b 80 c0 00 00 00 48 85 c0 74 18 83 78
RSP: 002b:00007ffec1436bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffec1436c04 RCX: 0000000000405810
RDX: 00007ffec1436c0a RSI: 0000000000080001 RDI: 00000000004ae93c
RBP: 00007ffec1436c00 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000407540
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc4+ #101
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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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+0x9d0/0xef0 kernel/hung_task.c:289
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60


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