================================================================== BUG: KCSAN: data-race in __xa_set_mark / find_get_pages_range_tag write to 0xffff8881190d5228 of 8 bytes by task 3663 on cpu 0: instrument_write include/linux/instrumented.h:42 [inline] __test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:71 [inline] node_set_mark lib/xarray.c:93 [inline] xas_set_mark lib/xarray.c:879 [inline] __xa_set_mark+0x233/0x330 lib/xarray.c:1708 __set_page_dirty+0x17e/0x1d0 fs/buffer.c:609 mark_buffer_dirty+0x12e/0x260 fs/buffer.c:1137 __block_commit_write fs/buffer.c:2084 [inline] block_write_end+0x13d/0x220 fs/buffer.c:2162 generic_write_end+0x5c/0x250 fs/buffer.c:2176 ext4_da_write_end+0x57e/0x760 fs/ext4/inode.c:3092 generic_perform_write+0x23b/0x390 mm/filemap.c:3414 ext4_buffered_write_iter+0x2cc/0x3b0 fs/ext4/file.c:270 ext4_file_write_iter+0x57b/0x1000 fs/ext4/file.c:498 call_write_iter include/linux/fs.h:1882 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x665/0x6f0 fs/read_write.c:578 ksys_write+0xce/0x180 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:640 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881190d5228 of 8 bytes by task 3627 on cpu 1: xas_find_chunk include/linux/xarray.h:1625 [inline] xas_next_marked include/linux/xarray.h:1656 [inline] find_get_pages_range_tag+0x30c/0x5b0 mm/filemap.c:1976 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122 mpage_prepare_extent_to_map+0x19c/0x650 fs/ext4/inode.c:2559 ext4_writepages+0x97d/0x1ef0 fs/ext4/inode.c:2780 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:422 __filemap_fdatawrite mm/filemap.c:430 [inline] filemap_flush+0x1f/0x30 mm/filemap.c:457 ext4_alloc_da_blocks+0x4c/0x130 fs/ext4/inode.c:3146 ext4_release_file+0x5b/0x1c0 fs/ext4/file.c:142 __fput+0x246/0x4d0 fs/file_table.c:281 ____fput+0x11/0x20 fs/file_table.c:314 task_work_run+0x8e/0x110 kernel/task_work.c:141 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:139 [inline] exit_to_user_mode_prepare+0x1b2/0x210 kernel/entry/common.c:166 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:241 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: 3627 Comm: syz-executor.0 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================