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BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 fs/proc/base.c:2303
Read of size 8 at addr ffffffff853437f8 by task syzkaller929580/3091

CPU: 0 PID: 3091 Comm: syzkaller929580 Not tainted 4.15.0-rc2-next-20171205+ #59
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+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x178/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 show_timer+0x278/0x2b0 fs/proc/base.c:2303
 traverse+0x248/0xa00 fs/seq_file.c:111
 seq_read+0x96a/0x13d0 fs/seq_file.c:189
 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
 kernel_readv fs/splice.c:361 [inline]
 default_file_splice_read+0x508/0xae0 fs/splice.c:416
 do_splice_to+0x110/0x170 fs/splice.c:880
 splice_direct_to_actor+0x242/0x820 fs/splice.c:952
 do_splice_direct+0x2a7/0x3d0 fs/splice.c:1061
 do_sendfile+0x5d5/0xe90 fs/read_write.c:1413
 SYSC_sendfile64 fs/read_write.c:1468 [inline]
 SyS_sendfile64+0xbd/0x160 fs/read_write.c:1460
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x440149
RSP: 002b:00007ffe329cf008 EFLAGS: 00000213 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ffe329cedb0 RCX: 0000000000440149
RDX: 0000000020480ff8 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 000000000000007f R08: 0000000000000011 R09: 65732f636f72702f
R10: 00000000000000ff R11: 0000000000000213 R12: 00007ffe329cf010
R13: 00000000004a15b7 R14: 00007ffe329cef28 R15: 0000000000000001

The buggy address belongs to the variable:
 nstr.44331+0x18/0x40

Memory state around the buggy address:
 ffffffff85343680: fa fa fa fa 00 00 00 fa fa fa fa fa 00 06 fa fa
 ffffffff85343700: fa fa fa fa 07 fa fa fa fa fa fa fa 05 fa fa fa
>ffffffff85343780: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 fa
                                                                ^
 ffffffff85343800: fa fa fa fa 00 fa fa fa fa fa fa fa 07 fa fa fa
 ffffffff85343880: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
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