================================================================== BUG: KCSAN: data-race in dec_zone_page_state / release_pages write to 0xffffea000166a980 of 8 bytes by task 6773 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:328 [inline] release_pages+0x3b3/0x8c0 mm/swap.c:897 __pagevec_release+0x96/0xc0 mm/swap.c:931 pagevec_release include/linux/pagevec.h:88 [inline] invalidate_inode_pages2_range+0x69f/0x780 mm/truncate.c:752 iomap_dio_rw+0x3ff/0x8c0 fs/iomap/direct-io.c:484 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x3bc/0x420 fs/ext4/file.c:129 call_read_iter include/linux/fs.h:1902 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:312 do_splice_to fs/splice.c:870 [inline] splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x562/0xb10 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffea000166a980 of 8 bytes by task 21601 on cpu 1: 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+0x3fb/0x480 mm/page-writeback.c:2767 end_page_writeback+0xa7/0x110 mm/filemap.c:1314 ext4_finish_bio+0x429/0x490 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+0x306/0x360 fs/ext4/page-io.c:274 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 21601 Comm: kworker/u4:6 Not tainted 5.8.0-rc5-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 ==================================================================