================================================================== BUG: KCSAN: data-race in __writeback_single_inode / xas_set_mark write to 0xffff888131f8d4b4 of 4 bytes by task 3402 on cpu 0: xa_mark_set lib/xarray.c:69 [inline] xas_set_mark+0x13e/0x150 lib/xarray.c:889 __test_set_page_writeback+0x27f/0x500 mm/page-writeback.c:2796 set_page_writeback include/linux/page-flags.h:571 [inline] __mpage_writepage+0xec7/0x1080 fs/mpage.c:642 write_cache_pages+0x4d7/0x810 mm/page-writeback.c:2249 mpage_writepages+0x6d/0x120 fs/mpage.c:712 fat_writepages+0x20/0x30 fs/fat/inode.c:205 do_writepages+0x7b/0x150 mm/page-writeback.c:2355 __filemap_fdatawrite_range mm/filemap.c:413 [inline] file_write_and_wait_range+0x180/0x210 mm/filemap.c:792 __generic_file_fsync+0x48/0x140 fs/libfs.c:1088 fat_file_fsync+0x48/0x100 fs/fat/file.c:190 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2981 [inline] generic_file_write_iter+0x103/0x130 mm/filemap.c:3825 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x40a/0x750 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888131f8d4b4 of 4 bytes by task 3413 on cpu 1: xa_marked include/linux/xarray.h:418 [inline] mapping_tagged include/linux/fs.h:489 [inline] __writeback_single_inode+0x209/0x440 fs/fs-writeback.c:1661 writeback_single_inode+0x17b/0x3c0 fs/fs-writeback.c:1723 sync_inode fs/fs-writeback.c:2742 [inline] sync_inode_metadata+0x57/0x80 fs/fs-writeback.c:2762 __generic_file_fsync+0xf5/0x140 fs/libfs.c:1099 fat_file_fsync+0x48/0x100 fs/fat/file.c:190 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2981 [inline] generic_file_write_iter+0x103/0x130 mm/filemap.c:3825 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x40a/0x750 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0a000021 -> 0x04000021 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3413 Comm: syz-executor.1 Tainted: G W 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================