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BUG: KCSAN: data-race in __wb_writeout_add / writeout_period

write to 0xffffffff86e8e448 of 8 bytes by interrupt on cpu 0:
 writeout_period+0xa6/0xe0 mm/page-writeback.c:611
 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1421
 expire_timers+0x116/0x240 kernel/time/timer.c:1466
 __run_timers+0x320/0x3d0 kernel/time/timer.c:1734
 run_timer_softirq+0x56/0x60 kernel/time/timer.c:1749
 __do_softirq+0x158/0x2e3 kernel/softirq.c:558
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0x41/0x70 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x8d/0xb0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 copy_user_generic_unrolled+0xac/0xd0
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 _copy_from_user+0x78/0xc0 lib/usercopy.c:16
 copy_from_user include/linux/uaccess.h:152 [inline]
 copy_from_sockptr_offset include/linux/sockptr.h:48 [inline]
 tcp_repair_options_est net/ipv4/tcp.c:3154 [inline]
 do_tcp_setsockopt net/ipv4/tcp.c:3548 [inline]
 tcp_setsockopt+0x1089/0x1be0 net/ipv4/tcp.c:3698
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3505
 __sys_setsockopt+0x212/0x2b0 net/socket.c:2180
 __do_sys_setsockopt net/socket.c:2191 [inline]
 __se_sys_setsockopt net/socket.c:2188 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2188
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff86e8e448 of 8 bytes by task 274 on cpu 1:
 wb_domain_writeout_add mm/page-writeback.c:560 [inline]
 __wb_writeout_add+0x8a/0x1d0 mm/page-writeback.c:581
 __folio_end_writeback+0x2f4/0x540 mm/page-writeback.c:2809
 folio_end_writeback+0x57/0x130 mm/filemap.c:1652
 end_page_writeback+0x3b/0xe0 mm/folio-compat.c:26
 ext4_finish_bio+0x30e/0x3f0 fs/ext4/page-io.c:143
 ext4_release_io_end+0x5f/0x140 fs/ext4/page-io.c:158
 ext4_end_io_end fs/ext4/page-io.c:192 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:257 [inline]
 ext4_end_io_rsv_work+0x206/0x280 fs/ext4/page-io.c:271
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x0000000100001e09 -> 0x0000000100001f35

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 274 Comm: kworker/u4:3 Not tainted 5.18.0-rc2-syzkaller-00050-ga19944809fe9-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
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