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BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 fs/proc/base.c:2274
Read of size 8 at addr ffffffff853431f8 by task syz-executor7/4761

CPU: 1 PID: 4761 Comm: syz-executor7 Not tainted 4.15.0-rc2+ #126
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: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
 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
 C_SYSC_sendfile fs/read_write.c:1489 [inline]
 compat_SyS_sendfile+0xea/0x1a0 fs/read_write.c:1478
 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: 0023:0xf7f4ac79
RSP: 002b:00000000f774608c EFLAGS: 00000296 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 000000000000001b RCX: 000000000000001b
RDX: 0000000020eeeff8 RSI: 0000000000000091 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the variable:
 nstr.44444+0x18/0x40

Memory state around the buggy address:
 ffffffff85343080: fa fa fa fa 00 00 00 fa fa fa fa fa 00 06 fa fa
 ffffffff85343100: fa fa fa fa 07 fa fa fa fa fa fa fa 05 fa fa fa
>ffffffff85343180: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 fa
                                                                ^
 ffffffff85343200: fa fa fa fa 00 fa fa fa fa fa fa fa 07 fa fa fa
 ffffffff85343280: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
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