================================================================== BUG: KCSAN: data-race in ext4_writepages / xas_set_mark write to 0xffff88812c321cac of 4 bytes by task 2247 on cpu 1: xa_mark_set lib/xarray.c:69 [inline] xas_set_mark+0x13e/0x150 lib/xarray.c:889 tag_pages_for_writeback+0xad/0x2f0 mm/page-writeback.c:2133 ext4_writepages+0x6c3/0x1d70 fs/ext4/inode.c:2744 do_writepages+0x26b/0x3c0 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:400 [inline] __filemap_fdatawrite_range mm/filemap.c:433 [inline] file_write_and_wait_range+0x1ae/0x240 mm/filemap.c:810 ext4_sync_file+0x105/0x670 fs/ext4/fsync.c:151 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2955 [inline] ext4_buffered_write_iter+0x3af/0x400 fs/ext4/file.c:277 ext4_file_write_iter+0x2e7/0x11f0 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729 do_iter_write+0x192/0x5c0 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 iter_file_splice_write+0x43a/0x790 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+0x106/0x190 fs/splice.c:979 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88812c321cac of 4 bytes by task 2229 on cpu 0: xa_marked include/linux/xarray.h:418 [inline] mapping_tagged include/linux/fs.h:496 [inline] ext4_writepages+0x15e/0x1d70 fs/ext4/inode.c:2674 do_writepages+0x26b/0x3c0 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:400 [inline] __filemap_fdatawrite_range mm/filemap.c:433 [inline] filemap_write_and_wait_range+0x238/0x3c0 mm/filemap.c:704 __iomap_dio_rw+0x4ca/0x1010 fs/iomap/direct-io.c:540 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xa59/0x11f0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729 do_iter_write+0x192/0x5c0 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 iter_file_splice_write+0x43a/0x790 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+0x106/0x190 fs/splice.c:979 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x02000021 -> 0x0e000021 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 2229 Comm: syz-executor.4 Tainted: G W 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================