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BUG: KCSAN: data-race in do_select / pollwake

write to 0xffffc9000130f9d0 of 4 bytes by interrupt on cpu 1:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xc1/0x110 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_sync_key+0x51/0x80 kernel/sched/wait.c:173
 sock_def_readable+0x70/0x1b0 net/core/sock.c:3533
 tcp_data_ready+0x1ad/0x290 net/ipv4/tcp_input.c:5250
 tcp_rcv_established+0xca2/0xe90 net/ipv4/tcp_input.c:6279
 tcp_v4_do_rcv+0x665/0x740 net/ipv4/tcp_ipv4.c:1925
 tcp_v4_rcv+0x1a1d/0x1dd0 net/ipv4/tcp_ipv4.c:2363
 ip_protocol_deliver_rcu+0x36c/0x760 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x180/0x210 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_local_deliver+0x102/0x1e0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:469 [inline]
 ip_sublist_rcv_finish net/ipv4/ip_input.c:578 [inline]
 ip_list_rcv_finish net/ipv4/ip_input.c:627 [inline]
 ip_sublist_rcv+0x55d/0x650 net/ipv4/ip_input.c:635
 ip_list_rcv+0x25f/0x290 net/ipv4/ip_input.c:669
 __netif_receive_skb_list_ptype net/core/dev.c:5930 [inline]
 __netif_receive_skb_list_core+0x4f4/0x520 net/core/dev.c:5977
 __netif_receive_skb_list net/core/dev.c:6029 [inline]
 netif_receive_skb_list_internal+0x4e6/0x670 net/core/dev.c:6120
 gro_normal_list include/net/gro.h:532 [inline]
 napi_complete_done+0x1bf/0x440 net/core/dev.c:6490
 virtqueue_napi_complete drivers/net/virtio_net.c:737 [inline]
 virtnet_poll+0x1cf7/0x2150 drivers/net/virtio_net.c:3053
 __napi_poll+0x63/0x3c0 net/core/dev.c:7324
 napi_poll net/core/dev.c:7388 [inline]
 net_rx_action+0x3a3/0x800 net/core/dev.c:7510
 handle_softirqs+0xbf/0x280 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:680
 common_interrupt+0x81/0x90 arch/x86/kernel/irq.c:285
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705
 slab_free_hook mm/slub.c:2333 [inline]
 slab_free mm/slub.c:4656 [inline]
 kmem_cache_free+0xe4/0x2e0 mm/slub.c:4758
 putname+0xe1/0x100 fs/namei.c:297
 vfs_fstatat+0xe3/0x150 fs/stat.c:373
 __do_sys_newfstatat fs/stat.c:536 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:530
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:530
 x64_sys_call+0x2d6f/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffc9000130f9d0 of 4 bytes by task 3292 on cpu 0:
 poll_schedule_timeout fs/select.c:240 [inline]
 do_select+0xeba/0xfc0 fs/select.c:603
 core_sys_select+0x4c3/0x6d0 fs/select.c:677
 do_pselect fs/select.c:759 [inline]
 __do_sys_pselect6 fs/select.c:802 [inline]
 __se_sys_pselect6+0x212/0x270 fs/select.c:793
 __x64_sys_pselect6+0x78/0x90 fs/select.c:793
 x64_sys_call+0x1c26/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:271
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3292 Comm: syz-executor Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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