syzbot hit the following crash on upstream commit
f2d285669aae656dfeafa0bf25e86bbbc5d22329 (Tue Apr 3 17:45:39 2018 +0000)
Merge tag 'pm-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=75397ee3df5c70164154

Unfortunately, I don't have any reproducer for this crash yet.
Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5265497960480768
Kernel config: https://syzkaller.appspot.com/x/.config?id=686016073509112605
compiler: gcc (GCC) 7.1.1 20170620
user-space arch: i386

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Reported-by: syzbot+75397ee3df5c70164...@syzkaller.appspotmail.com
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cache_from_obj: Wrong slab cache. names_cache but object is from kmalloc-96
WARNING: CPU: 0 PID: 11100 at mm/slab.h:378 cache_from_obj mm/slab.h:376 [inline] WARNING: CPU: 0 PID: 11100 at mm/slab.h:378 kmem_cache_free+0x226/0x2a0 mm/slab.c:3736
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 11100 Comm: syz-executor3 Not tainted 4.16.0+ #288
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1a7/0x27d lib/dump_stack.c:53
 panic+0x1f8/0x42c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x1f4/0x2b0 lib/bug.c:186
 fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:991
RIP: 0010:cache_from_obj mm/slab.h:376 [inline]
RIP: 0010:kmem_cache_free+0x226/0x2a0 mm/slab.c:3736
RSP: 0018:ffff8801933a7970 EFLAGS: 00010282
RAX: 000000000000004b RBX: ffff8801dad7e600 RCX: 0000000000000000
RDX: 000000000000004b RSI: ffffc90002a2d000 RDI: ffffed0032674f22
RBP: ffff8801933a7990 R08: ffffed003b604f99 R09: ffffed003b604f99
R10: 0000000000000000 R11: ffffed003b604f98 R12: ffff880199ec2000
R13: ffff8801dad7e600 R14: ffff8801d08585dc R15: 00000000ffffffd8
 putname+0xc8/0x130 fs/namei.c:255
 filename_lookup+0x315/0x500 fs/namei.c:2324
 user_path_at_empty+0x40/0x50 fs/namei.c:2569
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x15f/0x2b90 fs/namespace.c:2787
 C_SYSC_mount fs/compat.c:195 [inline]
 compat_SyS_mount+0xd0/0x1070 fs/compat.c:160
 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f47c99
RSP: 002b:00000000f5f42c6c EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000080eff11 RCX: 0000000020000000
RDX: 0000000000000000 RSI: 00000000080d6b6d RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

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