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BUG: KASAN: out-of-bounds in csd_lock_record+0xcb/0xe0 kernel/smp.c:118
Read of size 8 at addr ffffc900023a7830 by task syz-executor.0/25754

CPU: 1 PID: 25754 Comm: syz-executor.0 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:
 <IRQ>
 __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
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_call_function_single+0xe0/0x120 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:604
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x19/0x60 kernel/kcov.c:197
Code: 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 c0 fe 01 00 65 8b 05 70 f7 8d 7e a9 00 01 ff 00 48 8b 34 24 <74> 0f f6 c4 01 74 35 8b 82 0c 14 00 00 85 c0 74 2b 8b 82 e8 13 00
RSP: 0018:ffffc90008df7818 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 000000000000000d RCX: ffffffff83646097
RDX: ffff888044ef4300 RSI: ffffffff836460aa RDI: 0000000000000005
RBP: ffff8880a32dd680 R08: 0000000000000001 R09: ffffffff8cad1e87
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000100
R13: 000000000000039e R14: dffffc0000000000 R15: 0000000000000000
 tomoyo_domain_quota_is_ok+0x31a/0x550 security/tomoyo/util.c:1070
 tomoyo_supervisor+0x2d4/0xeb0 security/tomoyo/common.c:2089
 tomoyo_audit_mount_log security/tomoyo/mount.c:32 [inline]
 tomoyo_mount_acl+0x524/0x840 security/tomoyo/mount.c:166
 tomoyo_mount_permission+0x151/0x3f0 security/tomoyo/mount.c:237
 security_sb_mount+0x66/0xc0 security/security.c:916
 do_mount+0x1bf/0x1df0 fs/namespace.c:3179
 __do_sys_mount fs/namespace.c:3447 [inline]
 __se_sys_mount fs/namespace.c:3424 [inline]
 __x64_sys_mount+0x18f/0x230 fs/namespace.c:3424
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:367
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007fd6e8835c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000004f75e0 RCX: 000000000045cb29
RDX: 0000000020000400 RSI: 0000000020000000 RDI: 0000000000400000
RBP: 000000000078bf00 R08: 0000000020000300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000077d R14: 00000000004ca74e R15: 00007fd6e88366d4


Memory state around the buggy address:
 ffffc900023a7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900023a7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900023a7800: f1 f1 f1 f1 00 00 00 00 f3 f3 f3 f3 00 00 00 00
                                        ^
 ffffc900023a7880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900023a7900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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