syzbot

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BUG: KCSAN: data-race in sctp_association_free / sctp_wait_for_connect

write to 0xffff888143ed301c of 1 bytes by task 18644 on cpu 0:
 sctp_association_free+0x153/0x590 net/sctp/associola.c:339
 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:940 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1324 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
 sctp_do_sm+0x2935/0x2f80 net/sctp/sm_sideeffect.c:1166
 sctp_primitive_ABORT+0x71/0x80 net/sctp/primitive.c:104
 sctp_sendmsg_check_sflags+0x18a/0x1c0 net/sctp/socket.c:1778
 sctp_sendmsg+0x11e6/0x1ad0 net/sctp/socket.c:2018
 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0x39a/0x510 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmmsg+0x267/0x4c0 net/socket.c:2549
 __do_sys_sendmmsg net/socket.c:2578 [inline]
 __se_sys_sendmmsg net/socket.c:2575 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2575
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888143ed301c of 1 bytes by task 18638 on cpu 1:
 sctp_wait_for_connect+0x177/0x360 net/sctp/socket.c:9295
 __sctp_connect+0x981/0xa80 net/sctp/socket.c:1244
 __sctp_setsockopt_connectx net/sctp/socket.c:1333 [inline]
 sctp_setsockopt_connectx net/sctp/socket.c:1360 [inline]
 sctp_setsockopt+0x2e4e/0x8870 net/sctp/socket.c:4611
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3478
 __sys_setsockopt+0x209/0x2a0 net/socket.c:2176
 __do_sys_setsockopt net/socket.c:2187 [inline]
 __se_sys_setsockopt net/socket.c:2184 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2184
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18638 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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