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BUG: KCSAN: data-race in do_select / pollwake

write to 0xffffc900015bf9e0 of 4 bytes by interrupt on cpu 0:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xb6/0x100 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+0x52/0x80 kernel/sched/wait.c:173
 sock_def_readable+0x70/0x190 net/core/sock.c:3583
 tcp_data_ready+0x1ab/0x290 net/ipv4/tcp_input.c:5259
 tcp_rcv_established+0xd28/0xef0 net/ipv4/tcp_input.c:6288
 tcp_v4_do_rcv+0x672/0x740 net/ipv4/tcp_ipv4.c:1925
 tcp_v4_rcv+0x1bd7/0x1f60 net/ipv4/tcp_ipv4.c:2363
 ip_protocol_deliver_rcu+0x397/0x780 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x184/0x220 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:317 [inline]
 ip_local_deliver+0xe8/0x1c0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:469 [inline]
 ip_sublist_rcv_finish net/ipv4/ip_input.c:579 [inline]
 ip_list_rcv_finish net/ipv4/ip_input.c:628 [inline]
 ip_sublist_rcv+0x56b/0x650 net/ipv4/ip_input.c:636
 ip_list_rcv+0x261/0x290 net/ipv4/ip_input.c:670
 __netif_receive_skb_list_ptype net/core/dev.c:6020 [inline]
 __netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6067
 __netif_receive_skb_list net/core/dev.c:6119 [inline]
 netif_receive_skb_list_internal+0x487/0x600 net/core/dev.c:6210
 gro_normal_list include/net/gro.h:532 [inline]
 napi_complete_done+0x1a3/0x410 net/core/dev.c:6580
 virtqueue_napi_complete drivers/net/virtio_net.c:737 [inline]
 virtnet_poll+0x18c5/0x1d10 drivers/net/virtio_net.c:3076
 __napi_poll+0x63/0x3a0 net/core/dev.c:7414
 napi_poll net/core/dev.c:7478 [inline]
 net_rx_action+0x391/0x830 net/core/dev.c:7605
 handle_softirqs+0xb7/0x290 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+0x83/0x90 arch/x86/kernel/irq.c:285
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
 __sanitizer_cov_trace_pc+0x0/0x70
 kthread_blkcg+0x3c/0x80 kernel/kthread.c:1716
 blkcg_css block/blk-cgroup.c:107 [inline]
 blk_cgroup_congested+0x15/0xc0 block/blk-cgroup.c:2256
 __folio_throttle_swaprate+0x5d/0x150 mm/swapfile.c:3913
 folio_throttle_swaprate include/linux/swap.h:636 [inline]
 folio_prealloc mm/memory.c:1077 [inline]
 wp_page_copy mm/memory.c:3569 [inline]
 do_wp_page+0x712/0x2400 mm/memory.c:4030
 handle_pte_fault mm/memory.c:6085 [inline]
 __handle_mm_fault mm/memory.c:6212 [inline]
 handle_mm_fault+0x77d/0x2be0 mm/memory.c:6381
 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read to 0xffffc900015bf9e0 of 4 bytes by task 3297 on cpu 1:
 poll_schedule_timeout fs/select.c:240 [inline]
 do_select+0xe48/0xf50 fs/select.c:603
 core_sys_select+0x3d7/0x6e0 fs/select.c:677
 do_pselect fs/select.c:759 [inline]
 __do_sys_pselect6 fs/select.c:802 [inline]
 __se_sys_pselect6+0x216/0x280 fs/select.c:793
 __x64_sys_pselect6+0x78/0x90 fs/select.c:793
 x64_sys_call+0x1caa/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:271
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 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: 1 UID: 0 PID: 3297 Comm: syz-executor Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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