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BUG: KCSAN: data-race in __xa_clear_mark / find_get_pages_range_tag

write to 0xffff88810efd2470 of 8 bytes by interrupt on cpu 1:
 instrument_write include/linux/instrumented.h:42 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:79 [inline]
 __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:109 [inline]
 node_clear_mark lib/xarray.c:100 [inline]
 xas_clear_mark lib/xarray.c:911 [inline]
 __xa_clear_mark+0xff/0x1e0 lib/xarray.c:1916
 test_clear_page_writeback+0x321/0x520 mm/page-writeback.c:2739
 end_page_writeback+0xd7/0x260 mm/filemap.c:1498
 ext4_finish_bio+0x429/0x480 fs/ext4/page-io.c:143
 ext4_end_bio+0x1ba/0x310 fs/ext4/page-io.c:364
 bio_endio+0x28d/0x350 block/bio.c:1450
 req_bio_endio block/blk-core.c:264 [inline]
 blk_update_request+0x4f5/0xb40 block/blk-core.c:1462
 scsi_end_request+0x4d/0x460 drivers/scsi/scsi_lib.c:570
 scsi_io_completion+0x104/0x1000 drivers/scsi/scsi_lib.c:969
 scsi_finish_command+0x26e/0x2b0 drivers/scsi/scsi.c:214
 scsi_softirq_done+0xdf/0x440 drivers/scsi/scsi_lib.c:1449
 blk_done_softirq+0x145/0x190 block/blk-mq.c:588
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:420
 common_interrupt+0xb5/0x130 arch/x86/kernel/irq.c:239
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:620
 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
 arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
 acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
 acpi_idle_do_entry drivers/acpi/processor_idle.c:516 [inline]
 acpi_idle_enter+0x25b/0x2e0 drivers/acpi/processor_idle.c:647
 cpuidle_enter_state+0x2b6/0x7c0 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:158 [inline]
 cpuidle_idle_call kernel/sched/idle.c:239 [inline]
 do_idle+0x193/0x230 kernel/sched/idle.c:299
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:396
 secondary_startup_64_no_verify+0xb0/0xbb

read to 0xffff88810efd2470 of 8 bytes by task 4843 on cpu 0:
 xas_find_chunk include/linux/xarray.h:1660 [inline]
 xas_next_marked include/linux/xarray.h:1691 [inline]
 find_get_pages_range_tag+0x35c/0x600 mm/filemap.c:2107
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122
 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:519
 filemap_fdatawait_range_keep_errors+0x21/0x90 mm/filemap.c:576
 jbd2_journal_finish_inode_data_buffers+0x4c/0x60 fs/jbd2/commit.c:274
 ext4_journal_finish_inode_data_buffers+0x41/0x60 fs/ext4/super.c:543
 journal_finish_inode_data_buffers fs/jbd2/commit.c:299 [inline]
 jbd2_journal_commit_transaction+0x1635/0x32b0 fs/jbd2/commit.c:786
 kjournald2+0x263/0x480 fs/jbd2/journal.c:213
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4843 Comm: jbd2/sda1-8 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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