================================================================== BUG: KCSAN: data-race in pollwake / pollwake write to 0xffffc90000f5bc30 of 4 bytes by interrupt 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+0x50/0x80 kernel/sched/wait.c:173 sock_def_readable+0x70/0x1b0 net/core/sock.c:3346 tcp_data_ready+0x1aa/0x280 net/ipv4/tcp_input.c:5150 tcp_data_queue+0x11c9/0x2d70 net/ipv4/tcp_input.c:5230 tcp_rcv_established+0x8fc/0xef0 net/ipv4/tcp_input.c:6177 tcp_v4_do_rcv+0x2d4/0x630 net/ipv4/tcp_ipv4.c:1906 tcp_v4_rcv+0x1aae/0x1d40 net/ipv4/tcp_ipv4.c:2329 ip_protocol_deliver_rcu+0x356/0x6d0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x13c/0x1a0 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] ip_local_deliver+0xec/0x1c0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0x4f0/0x5c0 net/ipv4/ip_input.c:639 ip_list_rcv+0x25e/0x290 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5575 [inline] __netif_receive_skb_list_core+0x356/0x460 net/core/dev.c:5623 __netif_receive_skb_list net/core/dev.c:5675 [inline] netif_receive_skb_list_internal+0x4e6/0x660 net/core/dev.c:5766 gro_normal_list include/net/gro.h:439 [inline] napi_complete_done+0x1cb/0x450 net/core/dev.c:6106 virtqueue_napi_complete drivers/net/virtio_net.c:450 [inline] virtnet_poll+0x7c0/0xae0 drivers/net/virtio_net.c:2171 __napi_poll+0x60/0x3b0 net/core/dev.c:6536 napi_poll net/core/dev.c:6605 [inline] net_rx_action+0x32b/0x750 net/core/dev.c:6738 __do_softirq+0xc4/0x279 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0x3b/0x90 kernel/softirq.c:644 common_interrupt+0x7f/0x90 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:640 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:705 __get_vma_policy mm/mempolicy.c:1751 [inline] get_vma_policy mm/mempolicy.c:1775 [inline] vma_alloc_folio+0x39/0x2b0 mm/mempolicy.c:2171 wp_page_copy mm/memory.c:3138 [inline] do_wp_page+0x61b/0x1f20 mm/memory.c:3525 handle_pte_fault mm/memory.c:5160 [inline] __handle_mm_fault mm/memory.c:5285 [inline] handle_mm_fault+0xb80/0x27b0 mm/memory.c:5450 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline] handle_page_fault arch/x86/mm/fault.c:1507 [inline] exc_page_fault+0x3ff/0x6d0 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 write to 0xffffc90000f5bc30 of 4 bytes by task 3873 on cpu 1: __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+0x50/0x80 kernel/sched/wait.c:173 pipe_write+0x962/0xd20 fs/pipe.c:612 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x430/0x6b0 fs/read_write.c:590 ksys_write+0xeb/0x1a0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b value changed: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3873 Comm: syz-fuzzer Not tainted 6.7.0-syzkaller-01727-gab27740f7665 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 ==================================================================