================================================================== BUG: KCSAN: data-race in __writeback_single_inode / xas_set_mark write to 0xffff8880b747e8d4 of 4 bytes by task 10250 on cpu 0: xa_mark_set lib/xarray.c:68 [inline] xas_set_mark lib/xarray.c:885 [inline] xas_set_mark+0x14d/0x160 lib/xarray.c:869 __test_set_page_writeback+0x612/0x7d0 mm/page-writeback.c:2785 set_page_writeback include/linux/page-flags.h:542 [inline] ext4_bio_write_page+0x157/0xb90 fs/ext4/page-io.c:424 mpage_submit_page+0xeb/0x170 fs/ext4/inode.c:2222 mpage_process_page_bufs+0x3b4/0x3d0 fs/ext4/inode.c:2336 mpage_prepare_extent_to_map+0x48b/0x760 fs/ext4/inode.c:2694 ext4_writepages+0x94f/0x2300 fs/ext4/inode.c:2822 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x1c5/0x230 mm/filemap.c:421 file_write_and_wait_range+0xfd/0x160 mm/filemap.c:782 __generic_file_fsync+0x59/0x190 fs/libfs.c:1000 ext4_sync_file+0x48e/0xb00 fs/ext4/fsync.c:120 vfs_fsync_range+0x82/0x150 fs/sync.c:197 generic_write_sync include/linux/fs.h:2853 [inline] ext4_file_write_iter+0x45b/0xa00 fs/ext4/file.c:279 call_write_iter include/linux/fs.h:1895 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x4c0/0x7f0 fs/splice.c:746 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1020 splice_direct_to_actor+0x215/0x510 fs/splice.c:975 do_splice_direct+0x161/0x1e0 fs/splice.c:1063 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880b747e8d4 of 4 bytes by task 10247 on cpu 1: mapping_tagged include/linux/fs.h:521 [inline] __writeback_single_inode+0x367/0x8e0 fs/fs-writeback.c:1499 writeback_single_inode+0x232/0x310 fs/fs-writeback.c:1562 sync_inode fs/fs-writeback.c:2599 [inline] sync_inode_metadata+0x74/0xa0 fs/fs-writeback.c:2619 __generic_file_fsync+0x122/0x190 fs/libfs.c:1011 ext4_sync_file+0x48e/0xb00 fs/ext4/fsync.c:120 vfs_fsync_range+0x82/0x150 fs/sync.c:197 generic_write_sync include/linux/fs.h:2853 [inline] ext4_file_write_iter+0x45b/0xa00 fs/ext4/file.c:279 call_write_iter include/linux/fs.h:1895 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x4c0/0x7f0 fs/splice.c:746 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1020 splice_direct_to_actor+0x215/0x510 fs/splice.c:975 do_splice_direct+0x161/0x1e0 fs/splice.c:1063 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10247 Comm: syz-executor.1 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================