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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 ffffc90000cbf970 by task syz-executor.4/6845

CPU: 1 PID: 6845 Comm: syz-executor.4 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:lock_acquire+0x270/0xad0 kernel/locking/lockdep.c:4962
Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d 6d c1 5a 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7
RSP: 0018:ffffc900018a7c88 EFLAGS: 00000282
RAX: 1ffffffff1369fe0 RBX: ffff8880904be480 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5a7acf
R10: fffffbfff18b4f59 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880956323e0 R14: 0000000000000000 R15: ffff8880904be480
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:354 [inline]
 tcp_close+0x6e3/0x11f0 net/ipv4/tcp.c:2503
 inet_release+0xe4/0x1f0 net/ipv4/af_inet.c:428
 __sock_release+0xcd/0x280 net/socket.c:605
 sock_close+0x18/0x20 net/socket.c:1278
 __fput+0x33c/0x880 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:135
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:222 [inline]
 __prepare_exit_to_usermode+0x1e9/0x1f0 arch/x86/entry/common.c:252
 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:376
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x416700
Code: Bad RIP value.
RSP: 002b:00007ffea8cfa948 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007ffea8cfaa50 RCX: 0000000000416700
RDX: 00000000000000e0 RSI: 00007ffea8cfae30 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000006000 R09: 0000000000004000
R10: 00007ffea8cfaa50 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffea8cfb0d0 R14: 0000000000194091 R15: 00007ffea8cfb0e0


Memory state around the buggy address:
 ffffc90000cbf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90000cbf880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90000cbf900: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00
                                                                ^
 ffffc90000cbf980: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90000cbfa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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