kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3088 Comm: syzkaller158965 Not tainted 4.15.0-rc2+ #116
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 000000000f5cd13f task.stack: 000000004a45c4a4
RIP: 0010:string+0xb4/0x200 lib/vsprintf.c:595
RSP: 0018:ffff8801cce776c8 EFLAGS: 00010003
RAX: dffffc0000000000 RBX: fffffffffffffffe RCX: ffffffff85136fbf
RDX: 0ece4cae6cae440d RSI: 1ffff100399cee01 RDI: ffff8801cce776e8
RBP: ffff8801cce77718 R08: ffffed00396b44b6 R09: ffffed00396b44b6
R10: 0000000000000002 R11: ffffed00396b44b5 R12: 7672657365722070
R13: 767265736572206f R14: ffffffffffffffff R15: ffff8801cb5a25aa
FS:  0000000000000000(0000) GS:ffff8801db400000(0063) knlGS:00000000091fe840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020460ffc CR3: 00000001d784b000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vsnprintf+0x863/0x1900 lib/vsprintf.c:2282
 seq_vprintf+0xe3/0x1a0 fs/seq_file.c:397
 seq_printf+0xb3/0xe0 fs/seq_file.c:412
 show_timer+0x1ee/0x2b0 fs/proc/base.c:2274
 seq_read+0x385/0x13d0 fs/seq_file.c:234
 do_loop_readv_writev fs/read_write.c:673 [inline]
 do_iter_read+0x3db/0x5b0 fs/read_write.c:897
 compat_readv+0x1bf/0x270 fs/read_write.c:1140
 do_compat_preadv64+0xdc/0x100 fs/read_write.c:1189
 C_SYSC_preadv fs/read_write.c:1209 [inline]
 compat_SyS_preadv+0x3b/0x50 fs/read_write.c:1203
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f06c79
RSP: 002b:00000000ff8f677c EFLAGS: 00000217 ORIG_RAX: 000000000000014d
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000205e2ff0
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000020f6afa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 01 00 00 e8 7f 88 5c fc 4d 85 f6 0f 84 10 01 00 00 e8 71 88 5c fc 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 4d 8d 65 01 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 ec 00 00 
RIP: string+0xb4/0x200 lib/vsprintf.c:595 RSP: ffff8801cce776c8
---[ end trace f4d7a4daa827a3d2 ]---