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    SubjectRe: [uml-devel] [UML] Problems building and running 2.6.17-rc4 on x86-64
    On Sun, May 14, 2006 at 03:25:41PM -0300, Alberto Bertogli wrote:
    > So I copied them from sysdeps/x86_64/jmpbuf-offsets.h, and building went
    > on. Probably, the same happens under i386.

    The current patch for this is

    I need to redo it, but that works for now.

    > Then, it built fine, but at the end several errors showed up:
    > WARNING: vmlinux - Section mismatch: reference to .init.text:do_mount_root from .bss between '__guard@@GLIBC_2.3.2' (at offset 0x603c5688) and 'stdout@@GLIBC_2.2.5'

    I have no idea what these mean, but they seem not to affect the
    viability of the resulting kernel.

    > It begins to boot, but panics right after mounting root:
    > [42949373.800000] kjournald starting. Commit interval 5 seconds
    > [42949373.800000] EXT3-fs: mounted filesystem with ordered data mode.
    > [42949373.800000] VFS: Mounted root (ext3 filesystem) readonly.
    > [42949373.800000] Kernel panic - not syncing: handle_trap - failed to wait at end of syscall, errno = 0, status = 2943

    This is a segfault happening when it shouldn't.

    Can you disassemble stub_segv_handler and send me the output? If
    you're unfamiliar with gdb, it works like this:

    % gdb linux
    GNU gdb Red Hat Linux (
    Copyright 2004 Free Software Foundation, Inc.
    GDB is free software, covered by the GNU General Public License, and you are
    welcome to change it and/or distribute copies of it under certain conditions.
    Type "show copying" to see the conditions.
    `There is absolutely no warranty for GDB. Type "show warranty" for details.
    This GDB was configured as "x86_64-redhat-linux-gnu"...Using host libthread_db library "/lib64/".

    (gdb) disas stub_segv_handler
    Dump of assembler code for function stub_segv_handler:
    0x00000000601610c8 <stub_segv_handler+0>: push %rbp
    0x00000000601610c9 <stub_segv_handler+1>: mov %rsp,%rbp
    0x00000000601610cc <stub_segv_handler+4>: mov %rdx,%r8

    There was a bug like this a month or so ago, but it has been in
    mainline for a while, so this should be something different.

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      Last update: 2006-05-15 05:41    [W:0.046 / U:4.004 seconds]
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