================================================================== BUG: KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty write to 0xffff8880b690b998 of 4 bytes by task 20275 on cpu 0: ext4_ext_insert_extent+0x8c9/0x25f0 fs/ext4/extents.c:2105 ext4_ext_map_blocks+0xbd1/0x1fb0 fs/ext4/extents.c:4238 ext4_map_blocks+0x230/0xcf0 fs/ext4/inode.c:621 mpage_map_one_extent fs/ext4/inode.c:2364 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2417 [inline] ext4_writepages+0x10c4/0x1e10 fs/ext4/inode.c:2770 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x1bb/0x220 mm/filemap.c:421 file_write_and_wait_range+0xfb/0x160 mm/filemap.c:760 ext4_sync_file+0x26e/0x8b0 fs/ext4/fsync.c:153 vfs_fsync_range+0x7c/0x150 fs/sync.c:197 generic_write_sync include/linux/fs.h:2872 [inline] ext4_buffered_write_iter+0x211/0x280 fs/ext4/file.c:277 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x137/0x3a0 fs/read_write.c:980 vfs_iter_write+0x56/0x80 fs/read_write.c:1040 iter_file_splice_write+0x530/0x830 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0x97/0xb0 fs/splice.c:1037 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992 do_splice_direct+0x152/0x1d0 fs/splice.c:1080 do_sendfile+0x380/0x800 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880b690b998 of 4 bytes by task 20270 on cpu 1: ext4_do_update_inode fs/ext4/inode.c:5023 [inline] ext4_mark_iloc_dirty+0xa37/0x1580 fs/ext4/inode.c:5603 ext4_mark_inode_dirty+0xe6/0x420 fs/ext4/inode.c:5796 ext4_dirty_inode+0xad/0xd0 fs/ext4/inode.c:5827 __mark_inode_dirty+0x5b7/0x940 fs/fs-writeback.c:2258 mark_inode_dirty include/linux/fs.h:2189 [inline] generic_write_end+0x24c/0x290 fs/buffer.c:2193 ext4_da_write_end+0x162/0x690 fs/ext4/inode.c:3090 generic_perform_write+0x1d7/0x320 mm/filemap.c:3313 ext4_buffered_write_iter+0x14e/0x280 fs/ext4/file.c:270 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x137/0x3a0 fs/read_write.c:980 vfs_iter_write+0x56/0x80 fs/read_write.c:1040 iter_file_splice_write+0x530/0x830 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0x97/0xb0 fs/splice.c:1037 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992 do_splice_direct+0x152/0x1d0 fs/splice.c:1080 do_sendfile+0x380/0x800 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 20270 Comm: syz-executor.3 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================