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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 ffffc90001837578 by task syz-executor.3/8754

CPU: 0 PID: 8754 Comm: syz-executor.3 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+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
 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:orc_find arch/x86/kernel/unwind_orc.c:163 [inline]
RIP: 0010:unwind_next_frame+0x280/0x1f90 arch/x86/kernel/unwind_orc.c:446
Code: 89 54 24 20 48 89 4c 24 18 e8 cc 66 80 00 4c 8b 44 24 30 48 8b 74 24 28 44 8b 54 24 20 48 8b 4c 24 18 46 8b 1c 85 c0 d4 9b 8b <44> 8d 46 01 48 ba 00 00 00 00 00 fc ff df 4a 8d 3c 85 c0 d4 9b 8b
RSP: 0018:ffffc90001867910 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff9200030cf2a RCX: ffffffff862e867e
RDX: 0000000000000003 RSI: 0000000000052e86 RDI: ffffffff8bb08ed8
RBP: 0000000000000001 R08: 0000000000052e86 R09: 0000000000000000
R10: 000000000007201e R11: 000000000010f303 R12: ffffc90001867a30
R13: ffffc90001867a1d R14: ffffc90001867a38 R15: ffffc900018679e8
 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:494
 slab_post_alloc_hook mm/slab.h:535 [inline]
 slab_alloc mm/slab.c:3316 [inline]
 kmem_cache_alloc+0x148/0x550 mm/slab.c:3486
 sock_alloc_inode+0x18/0x1c0 net/socket.c:253
 alloc_inode+0x61/0x230 fs/inode.c:232
 new_inode_pseudo+0x14/0xe0 fs/inode.c:928
 sock_alloc+0x3c/0x260 net/socket.c:573
 __sock_create+0xb9/0x740 net/socket.c:1392
 sock_create net/socket.c:1479 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1521
 __do_sys_socket net/socket.c:1530 [inline]
 __se_sys_socket net/socket.c:1528 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1528
 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:00007fbb47d5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000508520 RCX: 000000000045cb29
RDX: 0000000000000000 RSI: 4000000000000001 RDI: 0000000000000002
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000bba R14: 00000000004ce1c4 R15: 00007fbb47d5d6d4


Memory state around the buggy address:
 ffffc90001837400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90001837480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90001837500: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 f3 f3 f3 f3
                                                                ^
 ffffc90001837580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90001837600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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