================================================================== BUG: KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty write to 0xffff88810d74102c of 4 bytes by task 11019 on cpu 1: ext4_ext_store_pblock fs/ext4/ext4_extents.h:255 [inline] ext4_ext_insert_extent+0x19d5/0x2b50 fs/ext4/extents.c:2116 ext4_ext_map_blocks+0x16a3/0x1fc0 fs/ext4/extents.c:4259 ext4_map_blocks+0x700/0xfc0 fs/ext4/inode.c:628 mpage_map_one_extent+0x10d/0x390 fs/ext4/inode.c:2387 mpage_map_and_submit_extent fs/ext4/inode.c:2440 [inline] ext4_writepages+0xa41/0x1e30 fs/ext4/inode.c:2792 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:422 filemap_write_and_wait_range+0x8b/0x2a0 mm/filemap.c:655 filemap_write_and_wait include/linux/fs.h:2649 [inline] iomap_bmap+0x68/0x110 fs/iomap/fiemap.c:130 ext4_bmap+0x211/0x220 fs/ext4/inode.c:3225 bmap+0x56/0x80 fs/inode.c:1705 ioctl_fibmap fs/ioctl.c:74 [inline] file_ioctl fs/ioctl.c:531 [inline] do_vfs_ioctl+0xd2d/0xec0 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810d74102c of 4 bytes by task 11004 on cpu 0: ext4_do_update_inode fs/ext4/inode.c:5105 [inline] ext4_mark_iloc_dirty+0xdec/0x1650 fs/ext4/inode.c:5712 __ext4_mark_inode_dirty+0x450/0x610 fs/ext4/inode.c:5906 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5942 __mark_inode_dirty+0x74/0x740 fs/fs-writeback.c:2260 mark_inode_dirty include/linux/fs.h:2183 [inline] generic_write_end+0x15e/0x250 fs/buffer.c:2202 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3102 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3340 ext4_buffered_write_iter+0x2e5/0x3d0 fs/ext4/file.c:270 ext4_file_write_iter+0x45e/0x1090 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6d4/0x7c0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 11004 Comm: syz-executor.0 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================