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: 8337 Comm: syz-executor5 Not tainted 4.15.0-rc2+ #206
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 000000003b953385 task.stack: 00000000e70459f8
RIP: 0010:string+0xb4/0x200 lib/vsprintf.c:595
RSP: 0018:ffff8801d7a7f868 EFLAGS: 00010003
RAX: dffffc0000000000 RBX: fffffffffffffffe RCX: ffffffff85136fbf
RDX: 0ece4cae6cae440d RSI: ffffc90004599000 RDI: ffff8801d7a7f888
RBP: ffff8801d7a7f8b8 R08: ffffed003816a846 R09: ffffed003816a846
R10: 0000000000000002 R11: ffffed003816a845 R12: 7672657365722070
R13: 767265736572206f R14: ffffffffffffffff R15: ffff8801c0b5422a
FS:  00007f69e50ee700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000201a8ff8 CR3: 00000001d8c1d000 CR4: 00000000001426f0
DR0: 0000000020000000 DR1: 0000000020000008 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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
 vfs_readv+0x121/0x1c0 fs/read_write.c:959
 do_preadv+0x11b/0x1a0 fs/read_write.c:1043
 SYSC_preadv fs/read_write.c:1093 [inline]
 SyS_preadv+0x30/0x40 fs/read_write.c:1088
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4529d9
RSP: 002b:00007f69e50edc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f69e50ed950 RCX: 00000000004529d9
RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000013
RBP: 00007f69e50ed940 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7346
R13: 00007f69e50edac8 R14: 00000000004b7351 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: ffff8801d7a7f868
---[ end trace 51ab64baabcbc009 ]---