================================================================== BUG: KCSAN: data-race in dec_zone_page_state / release_pages write to 0xffffea000480d780 of 8 bytes by task 23786 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_inode_pages2_range+0xa08/0xab0 mm/truncate.c:752 iomap_dio_rw+0x540/0x9a0 fs/iomap/direct-io.c:481 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter fs/ext4/file.c:129 [inline] ext4_file_read_iter+0x2b4/0x360 fs/ext4/file.c:114 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x2df/0x470 fs/splice.c:313 do_splice_to+0xc7/0x100 fs/splice.c:892 splice_direct_to_actor+0x1b9/0x540 fs/splice.c:971 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 0xffffea000480d780 of 8 bytes by task 2468 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 ext4_finish_bio+0x430/0x540 fs/ext4/page-io.c:148 ext4_release_io_end+0xc5/0x270 fs/ext4/page-io.c:163 ext4_end_io_end fs/ext4/page-io.c:197 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:262 [inline] ext4_end_io_rsv_work+0x159/0x400 fs/ext4/page-io.c:276 process_one_work+0x424/0x930 kernel/workqueue.c:2264 worker_thread+0x9a/0x7e0 kernel/workqueue.c:2410 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: 2468 Comm: kworker/u4:3 Not tainted 5.6.0-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 ==================================================================