================================================================== BUG: KCSAN: data-race in skb_queue_tail / unix_dgram_poll write to 0xffff888090f238e0 of 4 bytes by task 27929 on cpu 1: __skb_insert include/linux/skbuff.h:1896 [inline] __skb_queue_before include/linux/skbuff.h:2001 [inline] __skb_queue_tail include/linux/skbuff.h:2034 [inline] skb_queue_tail+0x80/0xa0 net/core/skbuff.c:3144 unix_dgram_sendmsg+0x1003/0x1500 net/unix/af_unix.c:1806 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x360/0x4d0 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmmsg+0x322/0x4b0 net/socket.c:2496 __do_sys_sendmmsg net/socket.c:2525 [inline] __se_sys_sendmmsg net/socket.c:2522 [inline] __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2522 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888090f238e0 of 4 bytes by task 27935 on cpu 0: skb_queue_len include/linux/skbuff.h:1827 [inline] unix_recvq_full net/unix/af_unix.c:194 [inline] unix_dgram_poll+0x30a/0x3b0 net/unix/af_unix.c:2733 sock_poll+0x185/0x1a0 net/socket.c:1266 vfs_poll include/linux/poll.h:90 [inline] do_pollfd fs/select.c:869 [inline] do_poll fs/select.c:917 [inline] do_sys_poll+0x606/0xbc0 fs/select.c:1011 __do_sys_ppoll fs/select.c:1111 [inline] __se_sys_ppoll+0x169/0x1b0 fs/select.c:1091 __x64_sys_ppoll+0x63/0x70 fs/select.c:1091 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 27935 Comm: syz-executor.2 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================