================================================================== BUG: KCSAN: data-race in pollwake / pollwake write to 0xffffc90000703c30 of 4 bytes by interrupt on cpu 1: __pollwake fs/select.c:198 [inline] pollwake+0xbe/0x110 fs/select.c:218 __wake_up_common+0xb3/0x130 kernel/sched/wait.c:107 __wake_up_common_lock kernel/sched/wait.c:138 [inline] __wake_up_sync_key+0x82/0xc0 kernel/sched/wait.c:213 sock_def_readable+0x70/0x1b0 net/core/sock.c:3338 tcp_data_ready+0x1aa/0x280 net/ipv4/tcp_input.c:5128 tcp_data_queue+0x11c9/0x2d70 net/ipv4/tcp_input.c:5208 tcp_rcv_established+0x8fc/0xef0 net/ipv4/tcp_input.c:6155 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:5570 [inline] __netif_receive_skb_list_core+0x356/0x460 net/core/dev.c:5618 __netif_receive_skb_list net/core/dev.c:5670 [inline] netif_receive_skb_list_internal+0x4e6/0x660 net/core/dev.c:5761 gro_normal_list include/net/gro.h:439 [inline] napi_complete_done+0x1cb/0x450 net/core/dev.c:6101 virtqueue_napi_complete drivers/net/virtio_net.c:440 [inline] virtnet_poll+0x7c0/0xae0 drivers/net/virtio_net.c:2158 __napi_poll+0x60/0x3b0 net/core/dev.c:6531 napi_poll net/core/dev.c:6600 [inline] net_rx_action+0x32b/0x750 net/core/dev.c:6733 __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:636 __sanitizer_cov_trace_const_cmp2+0x8/0x90 kernel/kcov.c:298 ext4_fill_raw_inode+0x5a6/0xe90 fs/ext4/inode.c:4289 ext4_do_update_inode fs/ext4/inode.c:5094 [inline] ext4_mark_iloc_dirty+0x2e9/0xe10 fs/ext4/inode.c:5724 __ext4_mark_inode_dirty+0x314/0x440 fs/ext4/inode.c:5928 ext4_evict_inode+0x819/0xdc0 fs/ext4/inode.c:251 evict+0x1aa/0x410 fs/inode.c:664 iput_final fs/inode.c:1775 [inline] iput+0x42c/0x5b0 fs/inode.c:1801 do_unlinkat+0x282/0x4c0 fs/namei.c:4389 __do_sys_unlink fs/namei.c:4430 [inline] __se_sys_unlink fs/namei.c:4428 [inline] __x64_sys_unlink+0x30/0x40 fs/namei.c:4428 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b write to 0xffffc90000703c30 of 4 bytes by task 3093 on cpu 0: __pollwake fs/select.c:198 [inline] pollwake+0xbe/0x110 fs/select.c:218 __wake_up_common+0xb3/0x130 kernel/sched/wait.c:107 __wake_up_common_lock kernel/sched/wait.c:138 [inline] __wake_up_sync_key+0x82/0xc0 kernel/sched/wait.c:213 pipe_write+0x962/0xd20 fs/pipe.c:605 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x48a/0x790 fs/read_write.c:584 ksys_write+0xeb/0x1a0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b value changed: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 3093 Comm: syz-fuzzer Not tainted 6.6.0-syzkaller-10265-gbabe393974de #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 ==================================================================