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BUG: KCSAN: data-race in __wb_writeout_add / writeout_period

write to 0xffffffff86efbd90 of 8 bytes by interrupt on cpu 0:
 writeout_period+0xa6/0xe0 mm/page-writeback.c:614
 call_timer_fn+0x37/0x2f0 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x46c/0x650 kernel/time/timer.c:2022
 run_timer_softirq+0x31/0x40 kernel/time/timer.c:2037
 __do_softirq+0xc4/0x279 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0x3b/0x90 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x6d/0x80 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:705
 vsnprintf+0x4cf/0xe20 lib/vsprintf.c:2852
 audit_log_vformat+0x1ff/0x490 kernel/audit.c:1962
 audit_log_format+0x8b/0xb0 kernel/audit.c:1996
 audit_seccomp+0xfa/0x120 kernel/auditsc.c:3011
 seccomp_log kernel/seccomp.c:1003 [inline]
 __seccomp_filter+0xffa/0x1170 kernel/seccomp.c:1324
 __secure_computing+0x9e/0x1b0 kernel/seccomp.c:1354
 syscall_trace_enter kernel/entry/common.c:72 [inline]
 __syscall_enter_from_user_work kernel/entry/common.c:94 [inline]
 syscall_enter_from_user_mode+0xb4/0x190 kernel/entry/common.c:112
 do_syscall_64+0x25/0x110 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff86efbd90 of 8 bytes by task 20624 on cpu 1:
 wb_domain_writeout_add mm/page-writeback.c:563 [inline]
 __wb_writeout_add+0x8a/0x1d0 mm/page-writeback.c:584
 __folio_end_writeback+0x21b/0x4a0 mm/page-writeback.c:2963
 folio_end_writeback+0x74/0x1f0 mm/filemap.c:1598
 ext4_finish_bio+0x45c/0x8c0 fs/ext4/page-io.c:145
 ext4_release_io_end+0x8c/0x1e0 fs/ext4/page-io.c:160
 ext4_end_io_end fs/ext4/page-io.c:194 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
 ext4_end_io_rsv_work+0x2d3/0x360 fs/ext4/page-io.c:273
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
 worker_thread+0x525/0x730 kernel/workqueue.c:2784
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

value changed: 0x0000000100022683 -> 0x00000001000227af

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20624 Comm: kworker/u4:41 Not tainted 6.7.0-rc1-syzkaller-00304-g23dfa043f6d5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
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