syzbot

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BUG: KCSAN: data-race in tcp_update_metrics / tcp_update_metrics

read to 0xffff888135bf17c4 of 4 bytes by task 32649 on cpu 0:
 tcp_metric_get net/ipv4/tcp_metrics.c:68 [inline]
 tcp_update_metrics+0x182/0x6c0 net/ipv4/tcp_metrics.c:351
 tcp_time_wait+0x4a3/0x580 net/ipv4/tcp_minisocks.c:347
 tcp_rcv_state_process+0x74d/0x1de0
 tcp_v6_do_rcv+0x98a/0xb70 net/ipv6/tcp_ipv6.c:1509
 sk_backlog_rcv include/net/sock.h:1115 [inline]
 __release_sock+0xe5/0x240 net/core/sock.c:2970
 release_sock+0x44/0x110 net/core/sock.c:3507
 mptcp_subflow_shutdown+0xfb/0x310 net/mptcp/protocol.c:2788
 mptcp_check_send_data_fin net/mptcp/protocol.c:2839 [inline]
 __mptcp_wr_shutdown net/mptcp/protocol.c:2855 [inline]
 __mptcp_close+0x5fe/0x660 net/mptcp/protocol.c:2941
 mptcp_close+0x28/0xf0 net/mptcp/protocol.c:2997
 inet_release+0xc9/0xf0 net/ipv4/af_inet.c:427
 inet6_release+0x3e/0x50 net/ipv6/af_inet6.c:480
 __sock_release net/socket.c:654 [inline]
 sock_close+0x70/0x150 net/socket.c:1386
 __fput+0x303/0x600 fs/file_table.c:384
 ____fput+0x15/0x20 fs/file_table.c:412
 task_work_run+0x135/0x1a0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff888135bf17c4 of 4 bytes by task 3361 on cpu 1:
 tcp_metric_set net/ipv4/tcp_metrics.c:75 [inline]
 tcp_update_metrics+0x1ed/0x6c0 net/ipv4/tcp_metrics.c:363
 tcp_time_wait+0x4a3/0x580 net/ipv4/tcp_minisocks.c:347
 tcp_rcv_state_process+0x74d/0x1de0
 tcp_v6_do_rcv+0x98a/0xb70 net/ipv6/tcp_ipv6.c:1509
 sk_backlog_rcv include/net/sock.h:1115 [inline]
 __release_sock+0xe5/0x240 net/core/sock.c:2970
 __tcp_close+0x692/0xfa0 net/ipv4/tcp.c:2843
 tcp_close+0x26/0x90 net/ipv4/tcp.c:2919
 inet_release+0xc9/0xf0 net/ipv4/af_inet.c:427
 inet6_release+0x3e/0x50 net/ipv6/af_inet6.c:480
 __sock_release net/socket.c:654 [inline]
 sock_release+0x44/0xe0 net/socket.c:682
 rds_tcp_accept_one+0xd4/0x680 net/rds/tcp_listen.c:230
 rds_tcp_accept_worker+0x25/0x70 net/rds/tcp.c:532
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296

value changed: 0x00000847 -> 0x000007f7

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3361 Comm: kworker/u4:15 Not tainted 6.5.0-rc1-syzkaller-00248-gb6e6cc1f78c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Workqueue: krdsd rds_tcp_accept_worker
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