https://bugzilla.redhat.com/show_bug.cgi?id=1142421 kernel-3.17.0-0.rc5.git0.1.fc22.x86_64 btrfs-progs-3.16-1.fc21.x86_64 Steps to Reproduce: 1. mkfs.btrfs /dev/sdc 2. btrfs check --subvol-extents /dev/sdc Results: Segmentation fault (core dumped) [ 632.749774] btrfs[692]: segfault at 0 ip 00007fc9963fdd77 sp 00007fff93450880 error 4 in libc-2.19.90.so[7fc9963c2000+1bd000] Eric Sandeed writes in the bugzilla that this was broken by commit d34cbe76c723a05a14bbcfdc46e8ede789c3f1f9 which drops the requirement to specify a subvolid, but still does arg_strtou64(optarg) -> arg_strtou64(NULL) so it crashes. Chris Murphy-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html