usercopy: Kernel memory overwrite attempt detected to SLAB object 'names_cache' (offset 1628, size 4068)!
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kernel BUG at mm/usercopy.c:100!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
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Modules linked in:
CPU: 0 PID: 17832 Comm: syz-executor1 Not tainted 4.16.0-rc6+ #287
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:usercopy_abort+0xae/0xd0 mm/usercopy.c:88
RSP: 0018:ffff8801b698fab8 EFLAGS: 00010286
RAX: 0000000000000069 RBX: ffffffff880b966c RCX: 0000000000000000
RDX: 0000000000000069 RSI: 1ffff10036d31f0c RDI: ffffed0036d31f4b
RBP: ffff8801b698fb10 R08: 0000000000000000 R09: 1ffff10036d31eb3
R10: 000000000000059c R11: ffffffff88583118 R12: ffffffff87520540
R13: ffffffff875237e0 R14: 000000000000065c R15: 0000000000000fe4
FS:  0000000002715940(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004ba18d CR3: 00000001d757b001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __check_heap_object+0xb5/0xc0 mm/slab.c:4430
 check_heap_object mm/usercopy.c:236 [inline]
 __check_object_size+0x272/0x530 mm/usercopy.c:259
 check_object_size include/linux/thread_info.h:112 [inline]
 strncpy_from_user+0xf4/0x430 lib/strncpy_from_user.c:116
 getname_flags+0x10e/0x580 fs/namei.c:149
 getname fs/namei.c:209 [inline]
 SYSC_symlinkat fs/namei.c:4121 [inline]
 SyS_symlinkat fs/namei.c:4112 [inline]
 SYSC_symlink fs/namei.c:4145 [inline]
 SyS_symlink+0x7d/0x240 fs/namei.c:4143
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454ba7
RSP: 002b:0000000000a3eab8 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 000000000000019f RCX: 0000000000454ba7
RDX: 0000000000000000 RSI: 00000000004ba1a3 RDI: 0000000000a3f830
RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000002715940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001380
Code: e8 f8 32 c1 ff 48 8b 45 c0 4c 8b 45 c8 4d 89 e9 48 8b 55 d0 41 57 48 89 d9 41 56 4c 89 e6 48 c7 c7 e0 06 52 87 50 e8 1a d9 aa ff <0f> 0b 49 c7 c5 80 04 52 87 4c 89 e8 4d 89 e8 e9 76 ff ff ff 0f 
RIP: usercopy_abort+0xae/0xd0 mm/usercopy.c:88 RSP: ffff8801b698fab8
---[ end trace e956b06abf3f0a94 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..