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BUG: KCSAN: data-race in dec_zone_page_state / release_pages

write to 0xffffea000405b580 of 8 bytes by task 17200 on cpu 0:
 instrument_write include/linux/instrumented.h:42 [inline]
 __clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:42 [inline]
 __ClearPageLRU include/linux/page-flags.h:320 [inline]
 release_pages+0x439/0x9b0 mm/swap.c:849
 __pagevec_release+0x4d/0x80 mm/swap.c:883
 pagevec_release include/linux/pagevec.h:88 [inline]
 invalidate_mapping_pages+0x667/0x7d0 mm/truncate.c:620
 __generic_file_write_iter+0x352/0x370 mm/filemap.c:3406
 generic_file_write_iter+0x294/0x38e mm/filemap.c:3448
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:693
 do_iter_write fs/read_write.c:998 [inline]
 do_iter_write+0x137/0x3a0 fs/read_write.c:979
 vfs_iter_write+0x56/0x80 fs/read_write.c:1039
 iter_file_splice_write+0x530/0x830 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x97/0xb0 fs/splice.c:1037
 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992
 do_splice_direct+0x152/0x1d0 fs/splice.c:1080
 do_sendfile+0x396/0x810 fs/read_write.c:1520
 __do_sys_sendfile64 fs/read_write.c:1581 [inline]
 __se_sys_sendfile64 fs/read_write.c:1567 [inline]
 __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1567
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea000405b580 of 8 bytes by interrupt on cpu 1:
 page_zone include/linux/mm.h:1221 [inline]
 dec_zone_page_state+0x1d/0xd0 mm/vmstat.c:533
 test_clear_page_writeback+0x33f/0x7e0 mm/page-writeback.c:2757
 end_page_writeback+0x98/0x180 mm/filemap.c:1317
 page_endio+0x92/0x280 mm/filemap.c:1348
 mpage_end_io+0x146/0x1b0 fs/mpage.c:54
 bio_endio+0x2db/0x3e0 block/bio.c:1872
 req_bio_endio block/blk-core.c:245 [inline]
 blk_update_request+0x418/0x7a0 block/blk-core.c:1468
 blk_mq_end_request+0x4e/0x2f0 block/blk-mq.c:546
 lo_complete_rq+0x128/0x190 drivers/block/loop.c:487
 blk_done_softirq+0x1e6/0x250 block/blk-softirq.c:37
 __do_softirq+0x118/0x34a kernel/softirq.c:292
 run_ksoftirqd+0x41/0x60 kernel/softirq.c:603
 smpboot_thread_fn+0x374/0x4a0 kernel/smpboot.c:165
 kthread+0x1cb/0x1f0 kernel/kthread.c:255
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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