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BUG: KCSAN: data-race in __delayacct_blkio_end / __delayacct_blkio_start

write to 0xffff88812aa4afa8 of 8 bytes by task 8650 on cpu 1:
 __delayacct_blkio_start+0x35/0x40 kernel/delayacct.c:61
 delayacct_blkio_start include/linux/delayacct.h:119 [inline]
 __schedule+0x18d/0x560 kernel/sched/core.c:4140
 schedule+0x91/0xd0 kernel/sched/core.c:4253
 io_schedule+0x3b/0x50 kernel/sched/core.c:5897
 wait_on_page_bit_common+0x484/0x760 mm/filemap.c:1150
 __lock_page_killable mm/filemap.c:1367 [inline]
 lock_page_maybe_drop_mmap mm/filemap.c:2342 [inline]
 filemap_fault+0x7f2/0x11e0 mm/filemap.c:2503
 ext4_filemap_fault+0x4b/0x60 fs/ext4/inode.c:6060
 __do_fault mm/memory.c:3464 [inline]
 do_read_fault+0x41f/0x730 mm/memory.c:3857
 do_fault mm/memory.c:3985 [inline]
 handle_pte_fault mm/memory.c:4225 [inline]
 __handle_mm_fault mm/memory.c:4357 [inline]
 handle_mm_fault+0x135d/0x1930 mm/memory.c:4394
 do_user_addr_fault+0x393/0x810 arch/x86/mm/fault.c:1295
 handle_page_fault arch/x86/mm/fault.c:1365 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565

read to 0xffff88812aa4afa8 of 8 bytes by task 8646 on cpu 0:
 delayacct_end kernel/delayacct.c:48 [inline]
 __delayacct_blkio_end+0x70/0x100 kernel/delayacct.c:82
 delayacct_blkio_end include/linux/delayacct.h:125 [inline]
 try_to_wake_up+0x109/0x4d0 kernel/sched/core.c:2590
 autoremove_wake_function+0xc/0x50 kernel/sched/wait.c:389
 wake_page_function+0xb5/0xe0 mm/filemap.c:1027
 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:93
 wake_up_page_bit+0xa4/0x190 mm/filemap.c:1047
 unlock_page+0x5e/0x70 mm/filemap.c:1292
 do_read_fault+0x56b/0x730 mm/memory.c:3862
 do_fault mm/memory.c:3985 [inline]
 handle_pte_fault mm/memory.c:4225 [inline]
 __handle_mm_fault mm/memory.c:4357 [inline]
 handle_mm_fault+0x135d/0x1930 mm/memory.c:4394
 do_user_addr_fault+0x393/0x810 arch/x86/mm/fault.c:1295
 handle_page_fault arch/x86/mm/fault.c:1365 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8646 Comm: syz-fuzzer Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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