syzbot

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BUG: KCSAN: data-race in unix_dgram_connect / unix_dgram_poll

write to 0xffff8881066cde30 of 4 bytes by task 10041 on cpu 1:
 unix_dgram_disconnected net/unix/af_unix.c:486 [inline]
 unix_dgram_connect+0x792/0x860 net/unix/af_unix.c:1190
 __sys_connect_file net/socket.c:1852 [inline]
 __sys_connect+0x245/0x280 net/socket.c:1869
 __do_sys_connect net/socket.c:1879 [inline]
 __se_sys_connect net/socket.c:1876 [inline]
 __x64_sys_connect+0x3d/0x50 net/socket.c:1876
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881066cde30 of 4 bytes by task 10031 on cpu 0:
 unix_dgram_poll+0x6e/0x3b0 net/unix/af_unix.c:2692
 sock_poll+0x188/0x1a0 net/socket.c:1265
 vfs_poll include/linux/poll.h:90 [inline]
 ep_item_poll fs/eventpoll.c:885 [inline]
 ep_send_events_proc+0x227/0x5f0 fs/eventpoll.c:1742
 ep_scan_ready_list+0x13e/0x330 fs/eventpoll.c:712
 ep_send_events fs/eventpoll.c:1786 [inline]
 ep_poll fs/eventpoll.c:1942 [inline]
 do_epoll_wait+0x4b2/0x810 fs/eventpoll.c:2323
 __do_sys_epoll_wait fs/eventpoll.c:2333 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2330 [inline]
 __x64_sys_epoll_wait+0x4d/0x60 fs/eventpoll.c:2330
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10031 Comm: syz-executor.3 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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