On Tue, Jan 14, 2014 at 02:33:15PM -0800, Kees Cook wrote: > On Tue, Jan 14, 2014 at 5:31 AM, Fengguang Wu <[email protected]> wrote: > > Greetings, > > > > I got the below dmesg and the first bad commit is > > > > commit 82fa9637a2ba285bcc7c5050c73010b2c1b3d803 > > Author: Kees Cook <[email protected]> > > AuthorDate: Thu Oct 10 17:18:16 2013 -0700 > > Commit: H. Peter Anvin <[email protected]> > > CommitDate: Sun Oct 13 03:12:19 2013 -0700 > > > > x86, kaslr: Select random position from e820 maps > > > > Counts available alignment positions across all e820 maps, and chooses > > one randomly for the new kernel base address, making sure not to collide > > with unsafe memory areas. > > > > Signed-off-by: Kees Cook <[email protected]> > > Link: > > http://lkml.kernel.org/r/[email protected] > > Signed-off-by: H. Peter Anvin <[email protected]> > > > > Note that there are many other warning/errors and it's not very > > reproducible, so this report might be wrong. > > > > =================================================== > > PARENT COMMIT NOT CLEAN. LOOK OUT FOR WRONG BISECT! > > =================================================== > > > > +-----------------------------------------------------------+--------------+--------------+ > > | | 5bfce5ef55cb > > | 1955a14a5ba6 | > > +-----------------------------------------------------------+--------------+--------------+ > > | boot_successes | 3948 > > | 0 | > > | boot_failures | 52 > > | 89 | > > | page_allocation_failure:order:,mode | 48 > > | 2 | > > | Out_of_memory:Kill_process | 7 > > | | > > | BUG:kernel_early_hang_without_any_printk_output | 1 > > | | > > | BUG:soft_lockup-CPU_stuck_for_s | 1 > > | | > > | WARNING:CPU:PID:at_kernel/locking/lockdep.c:check_flags() | 0 > > | 85 | > > | general_protection_fault:SMP_SMP | 0 > > | 1 | > > | RIP:__lock_acquire | 0 > > | 1 | > > | Kernel_panic-not_syncing:Fatal_exception | 0 > > | 1 | > > | BUG:kernel_boot_hang | 0 > > | 2 | > > | BUG:kernel_boot_crashed | 0 > > | 1 | > > +-----------------------------------------------------------+--------------+--------------+ > > > > The last dmesg is > > > > [ 0.803796] Initramfs unpacking failed: junk in compressed archive > > Can you tell me how the initrd for quantal-core-x86_64.cgz was built > in the qemu instances you're using? It seems like all the failures > point to a problem with how kASLR is interacting with the initrd.
That Initramfs unpacking error is much harder to reproduce, but anyway here's how I create the image file: quantal-core-x86_64.cgz is based on the ubuntu-core images files: http://cdimage.ubuntu.com/ubuntu-core/releases/quantal/release/ Download one image and extract files to quantal-core-x86_64/ and run the below script in parent dir ./create-cpio.sh quantal-core-x86_64 #!/bin/bash core=$1 [[ $1 ]] || exit cd $core || exit [[ -d ../addon ]] && cp -a ../addon/* . mkdir initrd ln -s sbin/init init find . | grep -v -e usr/doc \ -e usr/man \ -e usr/info \ -e sbin/modprobe \ -e usr/share/doc \ -e usr/share/man \ -e usr/share/info \ -e usr/share/i18n \ -e usr/share/locales \ -e usr/lib/x86_64-linux-gnu/gconv \ -e var/lib/apt/lists \ -e var/lib/dpkg/info \ -e var/cache/apt/archives | cpio -o -H newc | gzip -n -9 > ../$core.cgz -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
