==================================================================
BUG: KCSAN: data-race in dccp_poll / dccp_rcv_reset

write to 0xffff8881086b1428 of 4 bytes by interrupt on cpu 1:
 dccp_rcv_reset+0x9a/0x190 net/dccp/input.c:149
 dccp_rcv_state_process+0x2fb/0x4d0 net/dccp/input.c:662
 dccp_v4_do_rcv+0x8f/0xe0 net/dccp/ipv4.c:696
 sk_backlog_rcv include/net/sock.h:1051 [inline]
 __sk_receive_skb+0x22e/0x590 net/core/sock.c:542
 dccp_v4_rcv+0xc55/0xe90 net/dccp/ipv4.c:890
 ip_protocol_deliver_rcu+0x23b/0x480 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x126/0x160 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip_local_deliver+0x100/0x1b0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:437 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip_rcv+0x1b1/0x260 net/ipv4/ip_input.c:556
 __netif_receive_skb_one_core net/core/dev.c:5405 [inline]
 __netif_receive_skb+0x8b/0x1b0 net/core/dev.c:5519
 process_backlog+0x23f/0x3b0 net/core/dev.c:5847
 __napi_poll+0x65/0x390 net/core/dev.c:6413
 napi_poll net/core/dev.c:6480 [inline]
 net_rx_action+0x29e/0x650 net/core/dev.c:6567
 __do_softirq+0x158/0x2e3 kernel/softirq.c:558
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0x41/0x70 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x8d/0xb0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
 arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
 acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
 acpi_idle_do_entry drivers/acpi/processor_idle.c:551 [inline]
 acpi_idle_enter+0x27b/0x300 drivers/acpi/processor_idle.c:686
 cpuidle_enter_state+0x2ee/0x7a0 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x1b2/0x250 kernel/sched/idle.c:303
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400
 start_secondary+0x78/0x80 arch/x86/kernel/smpboot.c:266
 secondary_startup_64_no_verify+0xc4/0xcb

read to 0xffff8881086b1428 of 4 bytes by task 11268 on cpu 0:
 dccp_poll+0xbb/0x3c0 net/dccp/proto.c:323
 sock_poll+0x23e/0x260 net/socket.c:1306
 vfs_poll include/linux/poll.h:88 [inline]
 io_poll_check_events+0x20e/0x520 fs/io_uring.c:6912
 io_apoll_task_func+0x36/0x2f0 fs/io_uring.c:6985
 handle_tw_list fs/io_uring.c:2938 [inline]
 tctx_task_work+0x8bc/0xc00 fs/io_uring.c:2967
 task_work_run+0x8e/0x110 kernel/task_work.c:177
 get_signal+0xeca/0x1020 kernel/signal.c:2641
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x0000006f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11268 Comm: syz-executor.2 Not tainted 5.18.0-syzkaller-00511-g140e40e39a29-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================