==================================================================
BUG: KCSAN: data-race in do_select / pollwake

write to 0xffffc90000ef3a00 of 4 bytes by task 12700 on cpu 0:
 __pollwake fs/select.c:198 [inline]
 pollwake+0xbe/0x110 fs/select.c:218
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up_sync_key+0x51/0x80 kernel/sched/wait.c:173
 sctp_data_ready+0x70/0x1b0 net/sctp/socket.c:9277
 sctp_ulpq_tail_event+0x8e5/0x960 net/sctp/ulpqueue.c:254
 do_ulpq_tail_event+0x92/0xc0 net/sctp/stream_interleave.c:1295
 sctp_datamsg_destroy net/sctp/chunk.c:108 [inline]
 sctp_datamsg_put+0x28c/0x310 net/sctp/chunk.c:128
 sctp_chunk_free+0x34/0x50 net/sctp/sm_make_chunk.c:1515
 __sctp_outq_teardown+0x40c/0x510 net/sctp/outqueue.c:257
 sctp_outq_free+0x15/0x20 net/sctp/outqueue.c:277
 sctp_association_free+0x15c/0x590 net/sctp/associola.c:339
 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1330 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
 sctp_do_sm+0x2afc/0x31a0 net/sctp/sm_sideeffect.c:1169
 sctp_primitive_SHUTDOWN+0x75/0x90 net/sctp/primitive.c:89
 sctp_shutdown+0xb1/0xd0 net/sctp/socket.c:5160
 inet_shutdown+0x17e/0x210 net/ipv4/af_inet.c:923
 __sys_shutdown_sock net/socket.c:2425 [inline]
 __sys_shutdown net/socket.c:2437 [inline]
 __do_sys_shutdown net/socket.c:2445 [inline]
 __se_sys_shutdown+0x102/0x150 net/socket.c:2443
 __x64_sys_shutdown+0x31/0x40 net/socket.c:2443
 x64_sys_call+0x1fce/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:49
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffc90000ef3a00 of 4 bytes by task 12676 on cpu 1:
 poll_schedule_timeout fs/select.c:243 [inline]
 do_select+0xeb0/0xfa0 fs/select.c:607
 core_sys_select+0x362/0x530 fs/select.c:681
 do_pselect fs/select.c:763 [inline]
 __do_sys_pselect6 fs/select.c:804 [inline]
 __se_sys_pselect6+0x213/0x280 fs/select.c:795
 __x64_sys_pselect6+0x78/0x90 fs/select.c:795
 x64_sys_call+0xe7b/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:271
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12676 Comm: syz-executor.1 Not tainted 6.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
==================================================================
xt_time: unknown flags 0xc