================================================================== BUG: KCSAN: data-race in do_recvmmsg / unix_dgram_poll write to 0xffff8881388e3828 of 4 bytes by task 9767 on cpu 1: do_recvmmsg+0xa24/0xae0 net/socket.c:2824 __sys_recvmmsg net/socket.c:2847 [inline] __do_sys_recvmmsg net/socket.c:2870 [inline] __se_sys_recvmmsg net/socket.c:2863 [inline] __x64_sys_recvmmsg+0xde/0x160 net/socket.c:2863 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881388e3828 of 4 bytes by task 9769 on cpu 0: unix_dgram_poll+0x6e/0x3e0 net/unix/af_unix.c:3171 sock_poll+0x23e/0x260 net/socket.c:1306 vfs_poll include/linux/poll.h:88 [inline] do_pollfd fs/select.c:873 [inline] do_poll fs/select.c:921 [inline] do_sys_poll+0x4b7/0xad0 fs/select.c:1015 __do_sys_ppoll fs/select.c:1121 [inline] __se_sys_ppoll+0x18b/0x1d0 fs/select.c:1101 __x64_sys_ppoll+0x63/0x70 fs/select.c:1101 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000 -> 0x0000000e Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9769 Comm: syz-executor.3 Not tainted 5.17.0-syzkaller-11138-gf022814633e1-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================