IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: stack-out-of-bounds in __read_once_size include/linux/compiler.h:178 [inline]
BUG: KASAN: stack-out-of-bounds in update_stack_state+0x5d9/0x670 arch/x86/kernel/unwind_frame.c:270
Read of size 8 at addr ffff8801d8266a18 by task syz-executor1/3788

CPU: 0 PID: 3788 Comm: syz-executor1 Not tainted 4.14.0-syzkaller #0
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+0x145/0x1f0 lib/dump_stack.c:53
 print_address_description+0x6c/0x20b mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.7+0x11a/0x2d3 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:178 [inline]
 update_stack_state+0x5d9/0x670 arch/x86/kernel/unwind_frame.c:270
 __unwind_start+0xf9/0x330 arch/x86/kernel/unwind_frame.c:404
 unwind_start arch/x86/include/asm/unwind.h:51 [inline]
 perf_callchain_kernel+0x23f/0x5a0 arch/x86/events/core.c:2350
 get_perf_callchain+0x436/0xe10 kernel/events/callchain.c:220
 perf_callchain+0x125/0x170 kernel/events/callchain.c:193
 perf_prepare_sample+0xdb6/0x1940 kernel/events/core.c:6004
 __perf_event_output kernel/events/core.c:6120 [inline]
 perf_event_output_forward+0xdb/0x210 kernel/events/core.c:6138
 __perf_event_overflow+0x1f1/0x4d0 kernel/events/core.c:7370
 perf_swevent_overflow+0x1e9/0x310 kernel/events/core.c:7446
 perf_swevent_event+0x15e/0x2f0 kernel/events/core.c:7474
 do_perf_sw_event kernel/events/core.c:7587 [inline]
 ___perf_sw_event+0x3e5/0x620 kernel/events/core.c:7618
 perf_sw_event_sched include/linux/perf_event.h:1043 [inline]
 perf_event_task_sched_out include/linux/perf_event.h:1081 [inline]
 prepare_task_switch kernel/sched/core.c:2592 [inline]
 context_switch kernel/sched/core.c:2764 [inline]
 __schedule+0xff3/0x1f70 kernel/sched/core.c:3375
 schedule+0xef/0x430 kernel/sched/core.c:3434
 freezable_schedule include/linux/freezer.h:172 [inline]
 futex_wait_queue_me+0x3ce/0x850 kernel/futex.c:2494
 futex_wait+0x3e7/0x930 kernel/futex.c:2609
 do_futex+0x8b1/0x2620 kernel/futex.c:3491
 SYSC_futex kernel/futex.c:3551 [inline]
 SyS_futex+0xf0/0x3e7 kernel/futex.c:3519
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x453ef9
RSP: 002b:00007f97d0f81ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000072bec8 RCX: 0000000000453ef9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8
RBP: 0000000000000086 R08: 0000000000000000 R09: 000000000072bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc823a31df R14: 00007f97d0f829c0 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0007609980 count:0 mapcount:0 mapping:          (null) index:0xffff8801d8266980
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 ffff8801d8266980 00000000ffffffff
raw: 0000000000000000 dead000000000200 ffff8801dac00dc0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d8266900: 00 00 00 00 00 00 f2 f3 f3 f3 f3 00 00 00 00 00
 ffff8801d8266980: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2
>ffff8801d8266a00: f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2 f2 f2 f2 00 00
                            ^
 ffff8801d8266a80: 00 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
 ffff8801d8266b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
==================================================================