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BUG: KASAN: stack-out-of-bounds in csd_lock_record+0xcb/0xe0 kernel/smp.c:118
Read of size 8 at addr ffffc90000d2fbf0 by task syz-fuzzer/6801

CPU: 1 PID: 6801 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+0xcb/0xe0 kernel/smp.c:118
 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: 0033:0x413a98
Code: Bad RIP value.
RSP: 002b:000000c002e392b0 EFLAGS: 00000202
RAX: 000000c024af4500 RBX: 00000000007a6fb0 RCX: 000000c002e39310
RDX: 0000000000a68278 RSI: 000000c002e393b0 RDI: 000000c0000e87a8
RBP: 000000c002e392d8 R08: 0000000000b16f60 R09: 0000000000b16e60
R10: 0000000000000038 R11: 0000000000000011 R12: 0000000000000000
R13: 000000c00002d8e0 R14: 0000000000adc67a R15: 0000000000000000


Memory state around the buggy address:
 ffffc90000d2fa80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
 ffffc90000d2fb00: 00 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3
>ffffc90000d2fb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1
                                                                ^
 ffffc90000d2fc00: f1 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00
 ffffc90000d2fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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