================================================================== BUG: KCSAN: data-race in tick_nohz_handler / tick_nohz_idle_stop_tick write to 0xffffffff8652ebb0 of 4 bytes by interrupt on cpu 0: tick_sched_do_timer kernel/time/tick-sched.c:224 [inline] tick_nohz_handler+0x2bc/0x2d0 kernel/time/tick-sched.c:287 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x214/0x5e0 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x210/0x7b0 kernel/time/hrtimer.c:1818 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x5c/0x1a0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __filemap_add_folio+0x4/0x700 mm/filemap.c:853 filemap_add_folio+0x70/0x160 mm/filemap.c:947 __filemap_get_folio+0x2f1/0x5b0 mm/filemap.c:1934 ext4_da_write_begin+0x2ef/0x550 fs/ext4/inode.c:2885 generic_perform_write+0x1d5/0x410 mm/filemap.c:3974 ext4_buffered_write_iter+0x1f6/0x380 fs/ext4/file.c:299 ext4_file_write_iter+0x29f/0xe30 __kernel_write_iter+0x265/0x490 fs/read_write.c:523 dump_emit_page fs/coredump.c:890 [inline] dump_user_range+0x3a7/0x550 fs/coredump.c:951 elf_core_dump+0x1aa6/0x1bc0 fs/binfmt_elf.c:2077 do_coredump+0x1033/0x1890 fs/coredump.c:764 get_signal+0xdc1/0x1080 kernel/signal.c:2896 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x94/0x130 kernel/entry/common.c:231 irqentry_exit+0x12/0x50 kernel/entry/common.c:334 exc_general_protection+0x33d/0x4d0 arch/x86/kernel/traps.c:644 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:617 read to 0xffffffff8652ebb0 of 4 bytes by task 0 on cpu 1: tick_nohz_stop_tick kernel/time/tick-sched.c:1009 [inline] tick_nohz_idle_stop_tick+0x19e/0x640 kernel/time/tick-sched.c:1217 cpuidle_idle_call kernel/sched/idle.c:232 [inline] do_idle+0x178/0x230 kernel/sched/idle.c:332 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:430 start_secondary+0x94/0xa0 arch/x86/kernel/smpboot.c:313 common_startup_64+0x12c/0x137 value changed: 0xffffffff -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W 6.9.0-rc2-syzkaller-00385-g104db052b62d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ==================================================================