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BUG: KCSAN: data-race in do_sys_poll / pollwake

read to 0xffffc90011543bd0 of 4 bytes by task 6563 on cpu 0:
 poll_schedule_timeout fs/select.c:240 [inline]
 do_poll fs/select.c:964 [inline]
 do_sys_poll+0x986/0xc10 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1121 [inline]
 __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1101
 __x64_sys_ppoll+0x67/0x80 fs/select.c:1101
 x64_sys_call+0xe71/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:272
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffffc90011543bd0 of 4 bytes by task 6581 on cpu 1:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xbe/0x110 fs/select.c:215
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up+0x65/0xb0 kernel/sched/wait.c:127
 __sctp_write_space+0x175/0x1e0 net/sctp/socket.c:9092
 sctp_wake_up_waiters net/sctp/socket.c:9138 [inline]
 sctp_wfree+0x436/0x4c0 net/sctp/socket.c:9182
 skb_orphan include/linux/skbuff.h:3256 [inline]
 sctp_clear_owner_w+0x41/0x90 net/sctp/socket.c:150
 sctp_for_each_tx_datachunk+0x57d/0x600 net/sctp/socket.c:190
 sctp_sock_migrate+0x8bb/0x980 net/sctp/socket.c:9646
 sctp_accept+0x35b/0x450 net/sctp/socket.c:4899
 inet_accept+0x62/0xc0 net/ipv4/af_inet.c:783
 do_accept+0x2d9/0x390 net/socket.c:1948
 __sys_accept4_file net/socket.c:1988 [inline]
 __sys_accept4+0xc4/0x150 net/socket.c:2018
 __do_sys_accept4 net/socket.c:2029 [inline]
 __se_sys_accept4 net/socket.c:2026 [inline]
 __x64_sys_accept4+0x53/0x60 net/socket.c:2026
 x64_sys_call+0x23e6/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:289
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6581 Comm: syz.2.1389 Not tainted 6.11.0-syzkaller-10547-g684a64bf32b6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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