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    SubjectRe: boot failure, "DWARF2 unwinder stuck at 0xc0100199"
    On Sat, 19 Aug 2006 21:31:21 -0400
    "J. Bruce Fields" <bfields@fieldses.org> wrote:

    > As of 2.6.18-rc3, one of my test machines stopped booting. I'm not
    > seeing the whole OOPS (I could probably set up a serial console if
    > necessary), but it ends in something like:
    >
    > trace_hardirqs_on
    > idesci_pc_intr
    > ide_intr
    > handle_IRQ_event
    > __do_IRQ
    > do_IRQ
    > common_interrupt
    > default_idle
    > apm_cpu_idle
    > cpu_idle
    > rest_init
    > start_kernel
    > 0xc0100199
    > DWARF2 unwinder stuck at 0xc0100199
    > Leftover inexact backtrace:
    > =======================
    > BUG: unable to handle kernel paging request at virtual address 0000b034
    > printing eip:
    > c0103712
    > *pde = 00000000
    > Recursive die() failure, output suppressed
    > <0>Kernel panic - not syncing: Fatal exception in interrupt
    >
    > Bisecting, it looks like this starts happening after c97d20a...,
    > "[PATCH] i386: Do backtrace fallback too", though it's a little tricky
    > since the compile is broken near there for a little while.
    >
    > Kernel config appended; let me know if anything else would be useful.

    I think there were some unwinder fixes post-2.6.18-rc3.

    We need to work out what's causing this oops asap, please. Testing
    2.6.8-r4-git1 (which should be available within the day) would be useful,
    please. If it crashes, it'll be serial console time.
    -
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