================================================================== BUG: KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty write to 0xffff888125111488 of 4 bytes by task 27741 on cpu 0: ext4_ext_insert_extent+0x1a40/0x2c70 fs/ext4/extents.c:2119 ext4_ext_map_blocks+0x167d/0x1f00 fs/ext4/extents.c:4266 ext4_map_blocks+0x70d/0xef0 fs/ext4/inode.c:638 mpage_map_one_extent+0x10d/0x360 fs/ext4/inode.c:2395 mpage_map_and_submit_extent fs/ext4/inode.c:2448 [inline] ext4_writepages+0xc1a/0x1d10 fs/ext4/inode.c:2800 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 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:2987 [inline] ext4_buffered_write_iter+0x39c/0x3f0 fs/ext4/file.c:277 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519 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:1319 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xa9/0x130 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 0xffff888125111488 of 4 bytes by task 27729 on cpu 1: ext4_do_update_inode fs/ext4/inode.c:5109 [inline] ext4_mark_iloc_dirty+0xd4d/0x1750 fs/ext4/inode.c:5724 __ext4_mark_inode_dirty+0x4db/0x5b0 fs/ext4/inode.c:5918 ext4_dirty_inode+0x86/0xa0 fs/ext4/inode.c:5947 __mark_inode_dirty+0x77/0x680 fs/fs-writeback.c:2398 mark_inode_dirty include/linux/fs.h:2403 [inline] generic_write_end+0x157/0x180 fs/buffer.c:2198 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3110 generic_perform_write+0x22a/0x3c0 mm/filemap.c:3667 ext4_buffered_write_iter+0x2f2/0x3f0 fs/ext4/file.c:269 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519 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: 0x000000b0 -> 0x000000c0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 27729 Comm: syz-executor.3 Tainted: G W 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================