Messages in this thread | | | Date | Thu, 16 Jan 2014 08:05:16 +0800 | From | Fengguang Wu <> | Subject | Re: [x86, kaslr] PANIC: early exception 0e rip 10:ffffffff8ae04c6e error 0 cr2 ffffffff81972b28 |
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On Wed, Jan 15, 2014 at 02:32:52PM -0800, Kees Cook wrote: > On Wed, Jan 15, 2014 at 4:24 AM, Fengguang Wu <fengguang.wu@intel.com> wrote: > > Kees, > > > > This script can reproduce the problem. Please modify the -initrd line > > before use. > > > > Usage: > > ./kvm-0day.sh vmlinuz-3.12.0-rc4-00008-g6e6a493 > > > > #!/bin/bash > > > > kernel=$1 > > > > kvm=( > > qemu-system-x86_64 -cpu kvm64 -enable-kvm > > -kernel $kernel > > -initrd /kernel-tests/initrd/yocto-minimal-x86_64.cgz > > # -initrd /kernel-tests/initrd/yocto-minimal-i386.cgz > > # -initrd /kernel-tests/initrd/quantal-core-i386.cgz > > # -initrd /kernel-tests/initrd/quantal-core-x86_64.cgz > > -smp 2 > > -m 256M > > -net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio > > -net user,vlan=0 > > -net nic,vlan=1,model=e1000 > > -net user,vlan=1 > > -boot order=nc > > -no-reboot > > -watchdog i6300esb > > -serial stdio > > -display none > > -monitor null > > ) > > > > append=( > > debug > > sched_debug > > apic=debug > > ignore_loglevel > > # dyndbg=\"func kobject_release +p\" > > sysrq_always_enabled > > panic=10 > > prompt_ramdisk=0 > > earlyprintk=ttyS0,115200 > > console=ttyS0,115200 > > console=tty0 > > vga=normal > > root=/dev/ram0 > > rw > > ) > > > > "${kvm[@]}" --append "${append[*]}" > > Thanks! I'm using your yocto image and this script, but I still am not > encountering the problem. I'm building next-20140114 using the > randconfig you sent in the original report. It looks like you're built > against a slightly different kernel version? Is there some way you can > push the tree you're building to git somewhere for me to fetch?
Kees, judging from the below bisect log, next-20140114 boots fine. If you still have access to commit 82fa9637a2ba285bcc7c5050c73010b2c1b3d803 in the tip tree, it's the right one to test.
git bisect start 6e6a4932b0f569b1a5bb4fcbf5dde1b1a42f01bb v3.11 -- git bisect good b7c09ad4014e3678e8cc01fdf663c9f43b272dc6 # 22:54 20+ 0 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs git bisect good 654fdd041227d7de1594baa61c58f2c87bd0640f # 23:15 20+ 1 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 0b936842c86392dad2c880539e824881e5d8ba77 # 23:35 20+ 0 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc git bisect good 3dbecf0aa9692cffbb71313a380c0ecc606c5920 # 23:56 20+ 0 Merge tag 'xfs-for-linus-v3.12-rc4' of git://oss.sgi.com/xfs/xfs git bisect good 13caa8ed93513dd216ede0c84d833e39fc2e3e2a # 00:06 20+ 0 Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending git bisect good 8ab3820fd5b2896d66da7bb2a906bc382e63e7bc # 00:18 20+ 0 x86, kaslr: Return location from decompress_kernel git bisect bad 82fa9637a2ba285bcc7c5050c73010b2c1b3d803 # 00:18 0- 988 x86, kaslr: Select random position from e820 maps git bisect good 5bfce5ef55cbe78ee2ee6e97f2e26a8a582008f3 # 00:27 20+ 52 x86, kaslr: Provide randomness functions # first bad commit: [82fa9637a2ba285bcc7c5050c73010b2c1b3d803] x86, kaslr: Select random position from e820 maps git bisect good 5bfce5ef55cbe78ee2ee6e97f2e26a8a582008f3 # 00:39 60+ 52 x86, kaslr: Provide randomness functions git bisect good 1955a14a5ba6e3c3b11117812d11dc550ccc37ae # 00:59 60+ 149 Add linux-next specific files for 20140110 git bisect good 8bcd53c437d5fdd04fddd8c7e29ecbdc682e7ce1 # 01:22 60+ 60 Revert "x86, kaslr: Select random position from e820 maps" git bisect good a6da83f98267bc8ee4e34aa899169991eb0ceb93 # 01:38 60+ 42 Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc git bisect good cf1c1d193e37b9f79eedddc6bbd71b9f5f9751e5 # 01:45 72+ 1972 Add linux-next specific files for 20140114 Thanks, Fengguang
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