On 14/03/2016 17:16, Gordan Bobic wrote:
On 2016-03-14 17:13, Michael Howard wrote:
On 14/03/2016 16:56, Gordan Bobic wrote:
On 2016-03-14 15:00, Gordan Bobic wrote:
On 2016-03-01 22:32, Michael Howard wrote:
On 01/03/2016 22:26, Richard W.M. Jones wrote:
On Mon, Feb 29, 2016 at 03:20:03PM +0000, Michael Howard wrote: > Just to let you know, I can't get this to work. aarch64 is supposed > to be binary compatible, with the correct libraries installed, but > I'm thinking the cpu isn't. > > All I get is 'cannot execute binary file: Exec format error', > regardless of what I try. As I understand it the problem is page size - 64K was chosen by Red Hat for aarch64, where as 4K is the norm on armv7.
Anyway, you can run a 32 bit VM and it works well -- in fact a lot faster than regular 32 bit armv7 hardware.
Yes, with CONFIG_ARM64_4K_PAGES=y and CONFIG_COMPAT=y, 32 bit binaries run fine.
I built a kernel with these options enabled, but chrooting into an armv5tel subtree segfaults immediately. :-(
# grep -E "CONFIG_COMPAT=|CONFIG_ARM64_4K_PAGES=" /boot/config-4.4.5 CONFIG_ARM64_4K_PAGES=y CONFIG_COMPAT=y
# chroot /orcone/docker/rsel6/ Segmentation fault
The chroot is armv5tel soft-float, which I think should work. Oddly, I see no mention of a segfault in dmesg or in /var/log/messages on the host...
# strace chroot /orcone/docker/media/ execve("/sbin/chroot", ["chroot", "/orcone/docker/media/"], [/* 18 vars */]) = 0 brk(0) = 0x153eb000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f98108000 faccessat(AT_FDCWD, "/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=23876, ...}) = 0 mmap(NULL, 23876, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f98102000 close(3) = 0 openat(AT_FDCWD, "/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\270\r\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1801536, ...}) = 0 mmap(NULL, 1528796, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f97f66000 mprotect(0x7f980c2000, 65536, PROT_NONE) = 0 mmap(0x7f980d2000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x15c000) = 0x7f980d2000 mmap(0x7f980d8000, 13276, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f980d8000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f98101000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f98100000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f980ff000 mprotect(0x7f980d2000, 16384, PROT_READ) = 0 mprotect(0x41f000, 4096, PROT_READ) = 0 mprotect(0x7f9810b000, 4096, PROT_READ) = 0 munmap(0x7f98102000, 23876) = 0 brk(0) = 0x153eb000 brk(0x1540c000) = 0x1540c000 brk(0) = 0x1540c000 openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=109669264, ...}) = 0 mmap(NULL, 109669264, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f916cf000 close(3) = 0 chroot("/orcone/docker/media/") = 0 chdir("/") = 0 execve("/bin/bash", ["/bin/bash", "-i"], [/* 18 vars */]) = -1053305918634065933 --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} --- +++ killed by SIGSEGV +++ Segmentation fault
What am I doing differently?
Just to make sure we are as much on the same page as possible, here is the minimal chroot I am trying: http://ftp.redsleeve.org/pub/el6-staging/rootfs/rsel6-minimal.tar.xz
Built from the latest RedSleeve 6 binaries using: yum --installroot=/some/path install @core
Can you extract that into an empty folder and chroot into it from your aarch64 CentOS 7 install? Does it work for you or does it segfault?
If it works for you, any chance you could post your kernel config somewhere? It's the only thing I can think of that could plausibly be causeing the discrepancy (I am on 4.4.5 and IIRC you were on 4.5rc).
Downloading now but it will be a couple of hours before I can check it out.
Thanks, most appreciated. You may want to re-download, as I literally just replaced with tar ball with a more compressed version. If that happened during your download, what you get may end up being corrupted (check whether it matches the md5 checksum).
I did re-download, just in case. It all works here as expected.
[root@mp30 ~]# chroot ~/CHROOT2 [root@mp30 ~]# echo "nameserver 192.168.1.2" > /etc/resolv.conf [root@mp30 /]# yum search linux base | 3.8 kB 00:00 updates | 3.0 kB 00:00 ============================== N/S Matched: linux ============================== libselinux.armv5tel : SELinux library and simple utilities libselinux-utils.armv5tel : SELinux libselinux utilies python-linux-procfs.noarch : Linux /proc abstraction classes selinux-policy.noarch : SELinux policy configuration selinux-policy-doc.noarch : SELinux policy documentation selinux-policy-minimum.noarch : SELinux minimum base policy selinux-policy-mls.noarch : SELinux mls base policy selinux- SELinux policy compiler epel-release.noarch : Extra Packages for Enterprise Linux repository : configuration filesystem.armv5tel : The basic directory layout for a Linux system iptables.armv5tel : Tools for managing Linux kernel packet filtering : capabilities libsemanage.armv5tel : SELinux binary policy manipulation library libsepol.armv5tel : SELinux binary policy manipulation library man-pages.noarch : Man (manual) pages from the Linux Documentation Project man-pages-cs.noarch : Czech man pages from the Linux Documentation Project man-pages-es.noarch : Spanish man pages from the Linux Documentation Project man-pages-fr.noarch : French version of the Linux man-pages man-pages-it.noarch : Italian man (manual) pages from the Linux Documentation : Project man-pages-pl.noarch : Polish man pages from the Linux Documentation Project man-pages-ru.noarch : Russian man pages from the Linux Documentation Project man-pages-uk.noarch : Ukrainian man pages from the Linux Documentation Project policycoreutils.armv5tel : SELinux policy core utilities redhat-bookmarks.noarch : Red Hat Enterprise Linux bookmarks redhat-indexhtml.noarch : Browser default start page for Red Hat Enterprise : Linux redsleeve-release.armv5tel : Red Sleeve Enterprise Linux release file rhel-guest-image-6.noarch : Red Hat Enterprise Linux Guest Images util-linux-ng.armv5tel : A collection of basic system utilities
Name and summary matches only, use "search all" for everything. [root@mp30 /]# exit [root@mp30 ~]#