==================================================================
BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq

read-write to 0xffff888102f63b80 of 8 bytes by interrupt on cpu 1:
 rtc_handle_legacy_irq drivers/rtc/interface.c:624 [inline]
 rtc_pie_update_irq+0x95/0xf0 drivers/rtc/interface.c:672
 __run_hrtimer kernel/time/hrtimer.c:1739 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1803
 hrtimer_interrupt+0x235/0x4a0 kernel/time/hrtimer.c:1865
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 free_swap_cache mm/swap_state.c:294 [inline]
 free_pages_and_swap_cache+0x204/0x410 mm/swap_state.c:325
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
 tlb_flush_mmu+0x2cf/0x440 mm/mmu_gather.c:373
 zap_pte_range mm/memory.c:1714 [inline]
 zap_pmd_range mm/memory.c:1753 [inline]
 zap_pud_range mm/memory.c:1782 [inline]
 zap_p4d_range mm/memory.c:1803 [inline]
 unmap_page_range+0x1fc8/0x2380 mm/memory.c:1824
 unmap_single_vma+0x142/0x1d0 mm/memory.c:1870
 unmap_vmas+0x18d/0x2b0 mm/memory.c:1914
 exit_mmap+0x18a/0x680 mm/mmap.c:1667
 __mmput+0x28/0x1d0 kernel/fork.c:1353
 mmput+0x4c/0x60 kernel/fork.c:1375
 exit_mm+0xe4/0x190 kernel/exit.c:570
 do_exit+0x55e/0x17f0 kernel/exit.c:925
 do_group_exit+0x102/0x150 kernel/exit.c:1087
 get_signal+0xeb9/0x1000 kernel/signal.c:3017
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x62/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888102f63b80 of 8 bytes by task 9876 on cpu 0:
 rtc_dev_poll+0x76/0xb0 drivers/rtc/dev.c:198
 vfs_poll include/linux/poll.h:84 [inline]
 __io_arm_poll_handler+0x1e5/0xd50 io_uring/poll.c:578
 io_arm_poll_handler+0x3f6/0x5b0 io_uring/poll.c:706
 io_queue_async+0x89/0x320 io_uring/io_uring.c:1924
 io_queue_sqe io_uring/io_uring.c:1953 [inline]
 io_req_task_submit+0xb9/0xc0 io_uring/io_uring.c:1370
 io_handle_tw_list+0x1b9/0x200 io_uring/io_uring.c:1053
 tctx_task_work_run+0x6e/0x1c0 io_uring/io_uring.c:1117
 tctx_task_work+0x40/0x80 io_uring/io_uring.c:1135
 task_work_run+0x13a/0x1a0 kernel/task_work.c:239
 get_signal+0xe78/0x1000 kernel/signal.c:2790
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x62/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000000000ddc0 -> 0x000000000000dec0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9876 Comm: syz.4.1270 Tainted: G        W          6.13.0-rc1-syzkaller-00002-gcdd30ebb1b9f #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================