syzbot

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BUG: KCSAN: data-race in sctp_association_free / sctp_wait_for_connect

write to 0xffff88812fc0f008 of 1 bytes by task 8809 on cpu 1:
 sctp_association_free+0x14c/0x580 net/sctp/associola.c:336
 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1328 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]
 sctp_do_sm+0x2b25/0x3160 net/sctp/sm_sideeffect.c:1170
 sctp_primitive_ABORT+0x75/0x90 net/sctp/primitive.c:104
 sctp_sendmsg_check_sflags+0x199/0x1d0 net/sctp/socket.c:1780
 sctp_sendmsg+0x129c/0x1900 net/sctp/socket.c:2017
 inet_sendmsg+0x63/0x80 net/ipv4/af_inet.c:825
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 ____sys_sendmsg+0x375/0x4c0 net/socket.c:2501
 ___sys_sendmsg net/socket.c:2555 [inline]
 __sys_sendmmsg+0x263/0x500 net/socket.c:2641
 __do_sys_sendmmsg net/socket.c:2670 [inline]
 __se_sys_sendmmsg net/socket.c:2667 [inline]
 __x64_sys_sendmmsg+0x57/0x60 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88812fc0f008 of 1 bytes by task 8808 on cpu 0:
 sctp_wait_for_connect+0x178/0x350 net/sctp/socket.c:9309
 __sctp_connect+0x705/0x780 net/sctp/socket.c:1246
 __sctp_setsockopt_connectx net/sctp/socket.c:1335 [inline]
 sctp_setsockopt_connectx+0xc5/0x120 net/sctp/socket.c:1362
 sctp_setsockopt+0x716/0xe90 net/sctp/socket.c:4609
 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3668
 __sys_setsockopt+0x1c3/0x230 net/socket.c:2271
 __do_sys_setsockopt net/socket.c:2282 [inline]
 __se_sys_setsockopt net/socket.c:2279 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2279
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8808 Comm: syz-executor.3 Not tainted 6.3.0-rc5-syzkaller-00032-g99ddf2254feb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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