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BUG: KASAN: stack-out-of-bounds in csd_lock_record+0xd2/0xe0 kernel/smp.c:119
Read of size 8 at addr ffffc90001647918 by task syz-fuzzer/6795

CPU: 0 PID: 6795 Comm: syz-fuzzer Not tainted 5.8.0-rc3-next-20200703-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 csd_lock_record+0xd2/0xe0 kernel/smp.c:119
 flush_smp_call_function_queue+0x285/0x730 kernel/smp.c:391
 __sysvec_call_function_single+0x98/0x490 arch/x86/kernel/smp.c:248
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 sysvec_call_function_single+0x4f/0x120 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:604
RIP: 0033:0x42055c
Code: Bad RIP value.
RSP: 002b:000000c0000dbea8 EFLAGS: 00000246
RAX: 0000000000203001 RBX: 00007f61bf983304 RCX: 000000c000066480
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 00007f61bf8e5790
RBP: 000000c0000dbf28 R08: 00007f61bfb1cfff R09: 000000c004cc6080
R10: 00000000000000f0 R11: 00000000000000ef R12: 0000000000000074
R13: 0000000000002000 R14: 0000000000000002 R15: 0000000000000002


Memory state around the buggy address:
 ffffc90001647800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90001647880: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
>ffffc90001647900: 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00 00 00
                               ^
 ffffc90001647980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90001647a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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