================================================================== BUG: KCSAN: data-race in find_get_pages_range_tag / xas_init_marks write to 0xffff888102286fa8 of 8 bytes by task 18446 on cpu 1: instrument_write include/linux/instrumented.h:42 [inline] __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:85 [inline] node_clear_mark lib/xarray.c:100 [inline] xas_clear_mark lib/xarray.c:908 [inline] xas_init_marks+0x17e/0x310 lib/xarray.c:941 xas_store+0x213/0xce0 lib/xarray.c:803 page_cache_delete_batch mm/filemap.c:336 [inline] delete_from_page_cache_batch+0x3f7/0x7f0 mm/filemap.c:357 truncate_inode_pages_range+0x472/0xef0 mm/truncate.c:366 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] ksys_open include/linux/syscalls.h:1388 [inline] __do_sys_creat fs/open.c:1263 [inline] __se_sys_creat fs/open.c:1261 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1261 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888102286fa8 of 8 bytes by task 8374 on cpu 0: xas_find_chunk include/linux/xarray.h:1625 [inline] xas_next_marked include/linux/xarray.h:1656 [inline] find_get_pages_range_tag+0x2fc/0x570 mm/filemap.c:1908 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1120 mpage_prepare_extent_to_map+0x197/0x600 fs/ext4/inode.c:2559 ext4_writepages+0x7e2/0x1cb0 fs/ext4/inode.c:2736 do_writepages+0x7b/0x150 mm/page-writeback.c:2354 __writeback_single_inode+0x81/0x610 fs/fs-writeback.c:1452 writeback_sb_inodes+0x5b8/0xe00 fs/fs-writeback.c:1716 __writeback_inodes_wb+0xb2/0x240 fs/fs-writeback.c:1785 wb_writeback+0x2e0/0x730 fs/fs-writeback.c:1894 wb_check_start_all fs/fs-writeback.c:2018 [inline] wb_do_writeback+0x429/0x600 fs/fs-writeback.c:2044 wb_workfn+0xb8/0x430 fs/fs-writeback.c:2078 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: 8374 Comm: kworker/u4:5 Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================