================================================================== BUG: KCSAN: data-race in __xa_set_mark / xas_find_marked write to 0xffff8881417166a8 of 8 bytes by task 32035 on cpu 0: instrument_write include/linux/instrumented.h:42 [inline] __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:79 [inline] __test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:95 [inline] node_set_mark lib/xarray.c:93 [inline] xas_set_mark lib/xarray.c:882 [inline] __xa_set_mark+0xef/0x1b0 lib/xarray.c:1898 __set_page_dirty+0x17e/0x1d0 fs/buffer.c:609 mark_buffer_dirty+0x126/0x230 fs/buffer.c:1137 __ext4_handle_dirty_metadata+0x20a/0x590 fs/ext4/ext4_jbd2.c:362 ext4_do_update_inode fs/ext4/inode.c:5144 [inline] ext4_mark_iloc_dirty+0x12dd/0x16e0 fs/ext4/inode.c:5725 __ext4_mark_inode_dirty+0x4cd/0x5d0 fs/ext4/inode.c:5919 ext4_mkdir+0x552/0x730 fs/ext4/namei.c:2824 vfs_mkdir+0x288/0x350 fs/namei.c:3652 do_mkdirat+0x132/0x220 fs/namei.c:3675 __do_sys_mkdir fs/namei.c:3691 [inline] __se_sys_mkdir fs/namei.c:3689 [inline] __x64_sys_mkdir+0x32/0x40 fs/namei.c:3689 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881417166a8 of 8 bytes by task 19941 on cpu 1: xas_find_chunk include/linux/xarray.h:1660 [inline] xas_find_marked+0x22f/0x6b0 lib/xarray.c:1348 xas_next_marked include/linux/xarray.h:1696 [inline] find_get_pages_range_tag+0x406/0x600 mm/filemap.c:2103 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122 write_cache_pages+0x1e9/0x7f0 mm/page-writeback.c:2203 generic_writepages+0x64/0xa0 mm/page-writeback.c:2337 blkdev_writepages+0x19/0x20 fs/block_dev.c:1727 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:422 __filemap_fdatawrite mm/filemap.c:430 [inline] filemap_flush+0x1f/0x30 mm/filemap.c:457 __sync_blockdev+0x69/0x70 fs/block_dev.c:504 __sync_filesystem fs/sync.c:40 [inline] sync_filesystem+0xcb/0x160 fs/sync.c:64 ovl_sync_fs+0x94/0xc0 fs/overlayfs/super.c:286 __sync_filesystem fs/sync.c:39 [inline] sync_filesystem+0x112/0x160 fs/sync.c:67 generic_shutdown_super+0x3c/0x1f0 fs/super.c:448 kill_anon_super+0x23/0x40 fs/super.c:1055 deactivate_locked_super+0x6a/0xb0 fs/super.c:335 deactivate_super+0x85/0x90 fs/super.c:366 cleanup_mnt+0x277/0x2e0 fs/namespace.c:1118 __cleanup_mnt+0x15/0x20 fs/namespace.c:1125 task_work_run+0x8e/0x110 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x16b/0x1a0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19941 Comm: syz-executor.4 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================