================================================================== BUG: KCSAN: data-race in do_sys_poll / pollwake read to 0xffffc90003cafbd0 of 4 bytes by task 27748 on cpu 1: poll_schedule_timeout fs/select.c:243 [inline] do_poll fs/select.c:965 [inline] do_sys_poll+0x9b4/0xc10 fs/select.c:1016 __do_sys_ppoll fs/select.c:1122 [inline] __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1102 __x64_sys_ppoll+0x67/0x80 fs/select.c:1102 x64_sys_call+0x2c71/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:272 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffffc90003cafbd0 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+0x65/0xb0 kernel/sched/wait.c:127 bpf_ringbuf_notify+0x22/0x30 kernel/bpf/ringbuf.c:152 irq_work_single kernel/irq_work.c:221 [inline] irq_work_run_list kernel/irq_work.c:252 [inline] irq_work_run+0xdf/0x2c0 kernel/irq_work.c:261 __sysvec_irq_work+0x23/0x1a0 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 native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline] __default_send_IPI_shortcut arch/x86/kernel/apic/ipi.c:166 [inline] default_send_IPI_self+0x67/0x70 arch/x86/kernel/apic/ipi.c:247 __apic_send_IPI_self arch/x86/include/asm/apic.h:458 [inline] arch_irq_work_raise+0x48/0x50 arch/x86/kernel/irq_work.c:31 irq_work_raise kernel/irq_work.c:84 [inline] __irq_work_queue_local+0x82/0x1d0 kernel/irq_work.c:112 irq_work_queue+0x85/0x120 kernel/irq_work.c:124 ____bpf_ringbuf_submit kernel/bpf/ringbuf.c:500 [inline] bpf_ringbuf_submit+0xc8/0xe0 kernel/bpf/ringbuf.c:498 ___bpf_prog_run+0x9ab/0x46c0 kernel/bpf/core.c:1997 __bpf_prog_run32+0x74/0xa0 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:650 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run3+0x111/0x140 kernel/trace/bpf_trace.c:2421 __bpf_trace_hrtimer_init+0x28/0x40 include/trace/events/timer.h:193 __traceiter_hrtimer_init+0x5c/0xa0 include/trace/events/timer.h:193 trace_hrtimer_init include/trace/events/timer.h:193 [inline] debug_init kernel/time/hrtimer.c:472 [inline] hrtimer_init_sleeper+0x1c0/0x220 kernel/time/hrtimer.c:2017 hrtimer_init_sleeper_on_stack include/linux/hrtimer.h:254 [inline] schedule_hrtimeout_range_clock+0xb1/0x210 kernel/time/hrtimer.c:2307 schedule_hrtimeout_range+0x29/0x40 kernel/time/hrtimer.c:2359 poll_schedule_timeout fs/select.c:244 [inline] do_poll fs/select.c:965 [inline] do_sys_poll+0xa1f/0xc10 fs/select.c:1016 __do_sys_ppoll fs/select.c:1122 [inline] __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1102 __x64_sys_ppoll+0x67/0x80 fs/select.c:1102 x64_sys_call+0x2c71/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:272 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000001 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 27755 Comm: syz-executor.1 Not tainted 6.9.0-rc3-syzkaller-00365-g399f4dae683a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ==================================================================