Using vanilla-sources compiled with ARCH=um. According to the instructions at http://www.gentoo.org/doc/en/uml.xml: # mount -o loop /path/to/install-<TAB>.iso /mnt/loop # cp /mnt/loop/isolinux/gentoo.igz . # linux load_ramdisk=1 prompt_ramdisk=0 ramdisk_size=22000 \ > initrd=rescue.gz root=/dev/ram0 ubd0=root_fs ubd1=swap_fs \ > ubd2=/dev/cdroms/cdrom0 eth0=tuntap,,,192.168.0.254 There is no rescue.gz on 2005.1 livecd, so I copied gentoo.igz and did: linux load_ramdisk=1 prompt_ramdisk=0 ramdisk_size=24000 initrd=gentoo root=/dev/initrd I get: UML running in TT mode Checking PROT_EXEC mmap in /tmp...OK tracing thread pid = 5722 Here it seems to hang. Can anyone confirm that you can/can't boot the iso initrd on 2.6.13 user mode linux? If you can, what are your CFLAGS/USE (nptl?) and do you have any config options set in the kernel other than Block devices->initrd support?
I discovered the stderr=1 command line option - it should be mentioned on the gentoo doc page. New output: UML running in TT mode Checking PROT_EXEC mmap in /tmp...OK tracing thread pid = 6745 Linux version 2.6.13 (root@xenmaster) (gcc version 3.4.4 (Gentoo 3.4.4-r1, ssp-3.4.4-1.0, pie-8.7.8)) #7 SMP Thu Sep 22 17:07:12 BST 2005 Built 1 zonelists Kernel command line: load_ramdisk=1 prompt_ramdisk=0 ramdisk_size=24000 initrd=gentoo.gz root=dev/ram ubd0=/dev/vg/cbc0 ubd2=install-x86-minimal-2005.1.iso stderr=1 PID hash table entries: 256 (order: 8, 4096 bytes) Dentry cache hash table entries: 8192 (order: 3, 32768 bytes) Inode-cache hash table entries: 4096 (order: 2, 16384 bytes) Memory: 12312k available Mount-cache hash table entries: 512 Checking for host processor cmov support...Yes Checking for host processor xmm support...No Checking that ptrace can change system call numbers...OK Checking syscall emulation patch for ptrace...missing Checking that host ptys support output SIGIO...Yes Checking that host ptys support SIGIO on close...No, enabling workaround Checking for /dev/anon on the host...Not available (open failed with errno 2) Brought up 1 CPUs checking if image is initramfs... it is Then hangs. Is there something odd about the gentoo 2005.1 initrd?
It appears initramfs is probably broken in user mode linux.
Paolo, do you have any ideas on this? (UML guest boot freezing at "checking if image is initramfs... it is")
I already have received this report (probably this exact one), but I haven't had yet the time to do any testing / debugging - 2.6.14 is approaching. Plus, I have currently no idea about what the problem may be. However, I'll study the issue.
I've just added usermode-sources-2.6.14 to portage (2.6.14-bs1). Please confirm that the issue still exists there.
Created attachment 72606 [details] config-2.6.14-usermode I can't get it to compile. gcc -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -ffreestanding -O2 -fomit-frame-pointer -D__arch_um__ -DSUBARCH =\"i386\" -Iarch/um/include -I/usr/src/linux-2.6.14-usermode/arch/um/kernel/skas/include -Dvmap=kernel_vmap -Din6addr_loopback=kernel_in6addr_loopback -D errno=kernel_errno -Dsigprocmask=kernel_sigprocmask -fno-unit-at-a-time -U__i386__ -Ui386 -D_LARGEFILE64_SOURCE -Wdeclaration-after-statement -nostdinc -isystem /usr/lib/gcc/i686-pc-linux-gnu/3.4.4/include -D__KERNEL__ -Iinclude -S -o arch/um/kernel-offsets.s arch/um/sys-i386/kernel-offsets.c In file included from include/asm/thread_info.h:17, from include/linux/thread_info.h:21, from include/linux/spinlock.h:53, from include/linux/capability.h:45, from include/linux/sched.h:7, from arch/um/sys-i386/kernel-offsets.c:3: include/asm/processor.h:69: error: `CONFIG_X86_L1_CACHE_SHIFT' undeclared here (not in a function) include/asm/processor.h:69: error: requested alignment is not a constant In file included from include/linux/sched.h:12, from arch/um/sys-i386/kernel-offsets.c:3: include/linux/jiffies.h:27:5: warning: "CONFIG_HZ" is not defined include/linux/jiffies.h:29:7: warning: "CONFIG_HZ" is not defined include/linux/jiffies.h:31:7: warning: "CONFIG_HZ" is not defined Config attached.
Just added usermode-sources-2.6.14-r1 (2.6.14-bs3) to portage. Is that any better?
Please reopen when you test with a newer kernel. I'd suggest gentoo-sources-2.6.15 (I think/hope most of the important usermode stuff is merged there now).
I don't know for 2.6.15, but I didn't have time to work on this problem, sorry. However, for your compile error (comment #6), that was (likely) because you did some build command without ARCH=um - you need a make mrproper ARCH=um before proceeding (save your old .config, but it's likely for x86). In detail, that error is almost always because include/asm points to asm-i386.
