==================================================================
BUG: KCSAN: data-race in packet_do_bind / packet_getname

write to 0xffff8880a01afcc4 of 4 bytes by task 18923 on cpu 1:
 packet_do_bind+0x1da/0x630 net/packet/af_packet.c:3135
 packet_bind+0xab/0xf0 net/packet/af_packet.c:3199
 __sys_bind+0x1df/0x220 net/socket.c:1647
 __do_sys_bind net/socket.c:1658 [inline]
 __se_sys_bind net/socket.c:1656 [inline]
 __x64_sys_bind+0x4c/0x60 net/socket.c:1656
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a01afcc4 of 4 bytes by task 18925 on cpu 0:
 packet_getname+0xb6/0x1b0 net/packet/af_packet.c:3473
 __sys_getsockname+0xbd/0x1a0 net/socket.c:1862
 __do_sys_getsockname net/socket.c:1877 [inline]
 __se_sys_getsockname net/socket.c:1874 [inline]
 __x64_sys_getsockname+0x4c/0x60 net/socket.c:1874
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18925 Comm: syz-executor.3 Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 18925 Comm: syz-executor.3 Not tainted 5.4.0-rc7+ #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+0x11d/0x181 lib/dump_stack.c:118
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0xd kernel/kcsan/report.c:315
 kcsan_setup_watchpoint+0x3fe/0x460 kernel/kcsan/core.c:423
 check_access kernel/kcsan/core.c:466 [inline]
 __tsan_read4 kernel/kcsan/core.c:595 [inline]
 __tsan_read4+0xc6/0x100 kernel/kcsan/core.c:595
 packet_getname+0xb6/0x1b0 net/packet/af_packet.c:3473
 __sys_getsockname+0xbd/0x1a0 net/socket.c:1862
 __do_sys_getsockname net/socket.c:1877 [inline]
 __se_sys_getsockname net/socket.c:1874 [inline]
 __x64_sys_getsockname+0x4c/0x60 net/socket.c:1874
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45a639
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f951a18ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000033
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000020000140 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f951a18f6d4
R13: 00000000004c1508 R14: 00000000004d4738 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..