================================================================== BUG: KCSAN: data-race in do_select / pollwake read to 0xffffc900126f79e0 of 4 bytes by task 9791 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 write to 0xffffc900126f79e0 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+0x66/0xb0 kernel/sched/wait.c:127 bpf_ringbuf_notify+0x22/0x30 kernel/bpf/ringbuf.c:155 irq_work_single kernel/irq_work.c:221 [inline] irq_work_run_list kernel/irq_work.c:252 [inline] irq_work_run+0xe2/0x2d0 kernel/irq_work.c:261 __sysvec_irq_work+0x22/0x170 arch/x86/kernel/irq_work.c:22 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x66/0x80 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 __wrmsrq arch/x86/include/asm/msr.h:80 [inline] native_write_msr arch/x86/include/asm/msr.h:137 [inline] wrmsrq arch/x86/include/asm/msr.h:199 [inline] native_apic_msr_write+0x3d/0x60 arch/x86/include/asm/apic.h:212 apic_write arch/x86/include/asm/apic.h:405 [inline] x2apic_send_IPI_self+0x10/0x20 arch/x86/kernel/apic/x2apic_phys.c:107 __apic_send_IPI_self arch/x86/include/asm/apic.h:455 [inline] arch_irq_work_raise+0x46/0x50 arch/x86/kernel/irq_work.c:31 irq_work_raise kernel/irq_work.c:84 [inline] __irq_work_queue_local+0x10f/0x2c0 kernel/irq_work.c:112 irq_work_queue+0x70/0x100 kernel/irq_work.c:124 bpf_ringbuf_commit kernel/bpf/ringbuf.c:-1 [inline] ____bpf_ringbuf_submit kernel/bpf/ringbuf.c:512 [inline] bpf_ringbuf_submit+0xce/0xf0 kernel/bpf/ringbuf.c:510 bpf_prog_a526332ed0a73e3c+0x4b/0x4f bpf_dispatcher_nop_func include/linux/bpf.h:1322 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2258 [inline] bpf_trace_run2+0x104/0x1c0 kernel/trace/bpf_trace.c:2299 __bpf_trace_sys_enter+0x10/0x30 include/trace/events/syscalls.h:18 __do_trace_sys_enter include/trace/events/syscalls.h:18 [inline] trace_sys_enter+0x86/0x110 include/trace/events/syscalls.h:18 syscall_trace_enter+0x13e/0x1e0 kernel/entry/common.c:61 syscall_enter_from_user_mode_work include/linux/entry-common.h:170 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:200 [inline] do_syscall_64+0xac/0x200 arch/x86/entry/syscall_64.c:90 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000001 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3776 Comm: udevd Not tainted 6.16.0-rc5-syzkaller-00276-g5d5d62298b8b #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================