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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 ffffc90011d7f550 by task syz-executor.5/21334

CPU: 0 PID: 21334 Comm: syz-executor.5 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 10 ff b4 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d ee 7a c8 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 db 01 63 f9 65 8b 05 44 7a 15 78 85 c0 74 02 5d
RSP: 0018:ffffc900017478c8 EFLAGS: 00000286
RAX: 1ffffffff1369fe2 RBX: ffff88804d218580 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff87ec83ff
RBP: ffff8880ae635e00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880ae635e00
R13: ffff888090ee81c0 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3184 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3284
 context_switch kernel/sched/core.c:3448 [inline]
 __schedule+0x8bc/0x1e80 kernel/sched/core.c:4169
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4427
 idtentry_exit_cond_resched arch/x86/entry/common.c:645 [inline]
 idtentry_exit_cond_rcu+0xc0/0xf0 arch/x86/entry/common.c:692
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:tcp_stream_memory_free+0xf/0x160 include/net/tcp.h:1982
Code: 67 29 be fa 48 c7 c7 a0 5e 07 89 e8 7a 8d a7 fa e9 ed ad ff ff cc cc cc cc cc cc 41 54 41 89 f4 55 53 48 89 fb e8 41 29 be fa <48> 8d bb 7c 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90001747af8 EFLAGS: 00000212
RAX: 0000000000001e33 RBX: ffff88809ac0c200 RCX: ffffc90013d2c000
RDX: 0000000000040000 RSI: ffffffff86b5ddbf RDI: ffff88809ac0c200
RBP: 0000000000004bb0 R08: 0000000000000001 R09: ffffea00016b7c37
R10: 0000000000004bb0 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88809ac0c200 R15: ffff88804aa3ca40
 __sk_stream_memory_free include/net/sock.h:1276 [inline]
 __sk_stream_memory_free include/net/sock.h:1270 [inline]
 sk_stream_memory_free include/net/sock.h:1281 [inline]
 sk_stream_memory_free include/net/sock.h:1279 [inline]
 tcp_sendmsg_locked+0xb1d/0x2d00 net/ipv4/tcp.c:1282
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1441
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:814
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 __sys_sendto+0x21c/0x320 net/socket.c:1995
 __do_sys_sendto net/socket.c:2007 [inline]
 __se_sys_sendto net/socket.c:2003 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2003
 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:00007fa43169cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000502a20 RCX: 000000000045cb29
RDX: 000000000000fe6a RSI: 00000000200012c0 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000027
R10: 0000000000000011 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a4e R14: 00000000004cd338 R15: 00007fa43169d6d4


Memory state around the buggy address:
 ffffc90011d7f400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90011d7f480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90011d7f500: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 f3 f3 f3 f3
                                                    ^
 ffffc90011d7f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90011d7f600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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