==================================================================
BUG: KCSAN: data-race in dec_zone_page_state / release_pages

write to 0xffffea00046cafc0 of 8 bytes by task 9127 on cpu 1:
 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:328 [inline]
 release_pages+0x39a/0x860 mm/swap.c:898
 __pagevec_release+0x96/0xc0 mm/swap.c:932
 pagevec_release include/linux/pagevec.h:88 [inline]
 truncate_inode_pages_range+0x507/0xef0 mm/truncate.c:370
 truncate_inode_pages mm/truncate.c:476 [inline]
 truncate_pagecache+0x4f/0x70 mm/truncate.c:817
 ext4_setattr+0xaea/0xeb0 fs/ext4/inode.c:5403
 notify_change+0x7d4/0xa20 fs/attr.c:336
 do_truncate+0xe0/0x120 fs/open.c:64
 handle_truncate fs/namei.c:2901 [inline]
 do_open fs/namei.c:3247 [inline]
 path_openat+0x1a4c/0x20e0 fs/namei.c:3360
 do_filp_open+0xbd/0x1d0 fs/namei.c:3387
 do_sys_openat2+0x33c/0x4a0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 __do_sys_openat fs/open.c:1209 [inline]
 __se_sys_openat fs/open.c:1204 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1204
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea00046cafc0 of 8 bytes by task 19026 on cpu 0:
 page_to_nid include/linux/mm.h:1276 [inline]
 page_zone include/linux/mm.h:1418 [inline]
 dec_zone_page_state+0x13/0xd0 mm/vmstat.c:533
 test_clear_page_writeback+0x3b6/0x440 mm/page-writeback.c:2767
 end_page_writeback+0x8e/0xf0 mm/filemap.c:1314
 ext4_finish_bio+0x419/0x480 fs/ext4/page-io.c:146
 ext4_release_io_end+0x98/0x200 fs/ext4/page-io.c:161
 ext4_end_io_end fs/ext4/page-io.c:195 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline]
 ext4_end_io_rsv_work+0x2f6/0x350 fs/ext4/page-io.c:274
 process_one_work+0x3cb/0x990 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x210/0x220 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19026 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
==================================================================