================================================================== BUG: KCSAN: data-race in __writeback_single_inode / xas_set_mark write to 0xffff8881250c5d94 of 4 bytes by task 13882 on cpu 1: xa_mark_set lib/xarray.c:69 [inline] xas_set_mark lib/xarray.c:886 [inline] xas_set_mark+0x14d/0x160 lib/xarray.c:870 __test_set_page_writeback+0x610/0x7d0 mm/page-writeback.c:2785 set_page_writeback include/linux/page-flags.h:542 [inline] ext4_bio_write_page+0x157/0xb79 fs/ext4/page-io.c:458 mpage_submit_page+0xe4/0x1a0 fs/ext4/inode.c:2074 mpage_process_page_bufs+0x3e5/0x400 fs/ext4/inode.c:2188 mpage_prepare_extent_to_map+0x48b/0x760 fs/ext4/inode.c:2597 ext4_writepages+0x585/0x1d40 fs/ext4/inode.c:2725 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:760 ext4_sync_file+0x266/0x8c0 fs/ext4/fsync.c:153 vfs_fsync_range+0x82/0x150 fs/sync.c:197 generic_write_sync include/linux/fs.h:2867 [inline] ext4_buffered_write_iter+0x222/0x290 fs/ext4/file.c:277 ext4_file_write_iter+0xfa/0xd70 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1901 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:998 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:979 vfs_iter_write+0x5c/0x80 fs/read_write.c:1039 iter_file_splice_write+0x536/0x850 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1520 __do_sys_sendfile64 fs/read_write.c:1575 [inline] __se_sys_sendfile64 fs/read_write.c:1567 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1567 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881250c5d94 of 4 bytes by task 13877 on cpu 0: mapping_tagged include/linux/fs.h:521 [inline] __writeback_single_inode+0x367/0x8e0 fs/fs-writeback.c:1502 writeback_single_inode+0x232/0x310 fs/fs-writeback.c:1565 sync_inode fs/fs-writeback.c:2602 [inline] sync_inode_metadata+0x74/0xa0 fs/fs-writeback.c:2622 ext4_fsync_nojournal fs/ext4/fsync.c:94 [inline] ext4_sync_file+0x470/0x8c0 fs/ext4/fsync.c:172 vfs_fsync_range+0x82/0x150 fs/sync.c:197 generic_write_sync include/linux/fs.h:2867 [inline] ext4_buffered_write_iter+0x222/0x290 fs/ext4/file.c:277 ext4_file_write_iter+0xfa/0xd70 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1901 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:998 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:979 vfs_iter_write+0x5c/0x80 fs/read_write.c:1039 iter_file_splice_write+0x536/0x850 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1520 __do_sys_sendfile64 fs/read_write.c:1575 [inline] __se_sys_sendfile64 fs/read_write.c:1567 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1567 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 13877 Comm: syz-executor.5 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================