================================================================== BUG: KCSAN: data-race in complete_signal / do_group_exit read to 0xffff8880adf43b74 of 4 bytes by task 23274 on cpu 1: do_group_exit+0x7b/0x1c0 kernel/exit.c:904 __do_sys_exit_group kernel/exit.c:932 [inline] __se_sys_exit_group kernel/exit.c:930 [inline] __x64_sys_exit_group+0x2e/0x30 kernel/exit.c:930 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff8880adf43b74 of 4 bytes by task 23307 on cpu 0: complete_signal+0x530/0x5e0 kernel/signal.c:1039 __send_signal+0x5ea/0x870 kernel/signal.c:1175 send_signal+0x224/0x2b0 kernel/signal.c:1236 do_send_sig_info+0x5f/0xc0 kernel/signal.c:1285 send_sig_info kernel/signal.c:1604 [inline] send_sig+0x5f/0x80 kernel/signal.c:1614 sk_stream_error+0xa3/0xe0 net/core/stream.c:188 tcp_sendmsg_locked+0x162e/0x1fb0 net/ipv4/tcp.c:1420 tcp_sendmsg+0x39/0x60 net/ipv4/tcp.c:1436 inet6_sendmsg+0x6d/0x90 net/ipv6/af_inet6.c:576 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0x9f/0xc0 net/socket.c:657 sock_write_iter+0x16b/0x210 net/socket.c:989 call_write_iter include/linux/fs.h:1895 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 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: 23307 Comm: syz-executor.1 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================