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BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq

read-write to 0xffff888102f32380 of 8 bytes by interrupt on cpu 0:
 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
 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705
 try_to_unmap_one+0x3c3/0x14e0 mm/rmap.c:1697
 rmap_walk_file+0x272/0x3c0 mm/rmap.c:2708
 try_to_unmap+0xc3/0x110
 shrink_folio_list+0xddf/0x2710 mm/vmscan.c:1311
 reclaim_folio_list+0x81/0x2f0 mm/vmscan.c:2150
 reclaim_pages+0x215/0x270 mm/vmscan.c:2187
 madvise_cold_or_pageout_pte_range+0xeb7/0xf30 mm/madvise.c:558
 walk_pmd_range mm/pagewalk.c:130 [inline]
 walk_pud_range mm/pagewalk.c:226 [inline]
 walk_p4d_range mm/pagewalk.c:264 [inline]
 walk_pgd_range+0x7e4/0x1110 mm/pagewalk.c:305
 __walk_page_range+0xed/0x350 mm/pagewalk.c:412
 walk_page_range_mm+0x395/0x4e0 mm/pagewalk.c:505
 walk_page_range+0x56/0x70 mm/pagewalk.c:584
 madvise_pageout_page_range mm/madvise.c:617 [inline]
 madvise_pageout mm/madvise.c:644 [inline]
 madvise_vma_behavior mm/madvise.c:1261 [inline]
 madvise_walk_vmas mm/madvise.c:1497 [inline]
 do_madvise+0x1da8/0x2a70 mm/madvise.c:1684
 __do_sys_madvise mm/madvise.c:1700 [inline]
 __se_sys_madvise mm/madvise.c:1698 [inline]
 __x64_sys_madvise+0x61/0x70 mm/madvise.c:1698
 x64_sys_call+0x23ab/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:29
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888102f32380 of 8 bytes by task 4607 on cpu 1:
 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_poll_add+0x6b/0xf0 io_uring/poll.c:891
 io_issue_sqe+0x150/0xc10 io_uring/io_uring.c:1740
 io_queue_sqe io_uring/io_uring.c:1950 [inline]
 io_req_task_submit+0x6a/0xc0 io_uring/io_uring.c:1374
 io_poll_task_func+0x5fa/0x7c0
 io_handle_tw_list+0xe3/0x200 io_uring/io_uring.c:1057
 tctx_task_work_run+0x6e/0x1c0 io_uring/io_uring.c:1121
 tctx_task_work+0x40/0x80 io_uring/io_uring.c:1139
 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: 0x000000000002b5c0 -> 0x000000000002b6c0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4607 Comm: syz.6.333 Tainted: G        W          6.13.0-rc5-syzkaller-00198-g9244696b34f2 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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