[I'm tracking this issue here: https://bugzilla.redhat.com/show_bug.cgi?id=808421] febootstrap uses the ext2fs library to construct an ext2 filesystem. Since we updated to the latest version in git, febootstrap segfaults in ext2fs_find_first_zero_generic_bmap (called from ext2fs_new_inode). There's a complete stack trace in the bug above. I'm not claiming that we are calling this library correctly, but, you know, "it always worked until now". Here is the calling code: https://github.com/libguestfs/febootstrap/blob/636a80b5a70382f21da47c44a0acd3efa2bc7fcf/helper/ext2.c#L142 git bisect points to this change being the one which causes the problem: c1a1e7fc24d6e37f931bbb8eeb29c90243f0a55d is the first bad commit commit c1a1e7fc24d6e37f931bbb8eeb29c90243f0a55d Author: Sami Liedes <sami.liedes@xxxxxx> Date: Sat Mar 10 22:36:12 2012 +0200 libext2fs: Implement ext2fs_find_first_zero_generic_bmap(). This function searches a bitmap for the first zero bit within a range. It checks if there is a bitmap backend specific implementation available (if the relevant field in bitmap_ops is non-NULL). If not, it uses a generic and slow method by repeatedly calling test_bmap() in a loop. Also change ext2fs_new_inode() to use this new function. This change in itself does not result in a large speedup, rather it refactors the code in preparation for the introduction of a faster find_first_zero() for bitarray based bitmaps. Signed-off-by: Sami Liedes <sami.liedes@xxxxxx> Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
