[uml-devel] No Bug Here: [Was: Expected SIGSTOP persists in 2.4.26-3um ]

["D. Bahi" <dbahi@enterasys.com>]

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I withdraw this error report against 2.4.26-3um
against any plain vanilla UML kernel for that matter.

I've launched 2.4.26-3um about 200 times (50 at once
even, with the script attached its easy to stress test!)
and never seen this in a kernel that we haven't modified
ourselves... still if anyone has any ideas....

Thanks for your patience.

D. Bahi wrote:
> launching UMLs with nice seems to aggravate this problem --
> but it also has been seen w/o adding that irritant.
> 
> status is 0x1c7f - which maps to 0x1c (SIGWINCH    28 right?)
> 
> here it is trying to panic and generates a segfault
> 
> #4  0x08051270 in main (argc=11, argv=0xbfffd3e4, envp=0xbfffd414) at 
> arch/um/main.c:148
> #3  0x080dd2f4 in linux_main (argc=11, argv=0xbfffd3e4) at um_arch.c:332
> #2  0x080d9154 in can_do_skas () at process.c:255
> #1  0x080d9058 in stop_ptraced_child (pid=21301, stack=0x40001000, 
> exitcode=1) at process.c:182
> #0  0x0805628c in panic (fmt=0x81c8080 "check_ptrace : child exited with 
> status 0x%x") at panic.c:67
> 
> values for locals and parameters in stop_ptraced_child are:
> 
> (gdb) print errno
> $1 = 0
> (gdb) print n
> $2 = -1073774592
> (gdb) print pid
> $3 = 21301
> (gdb) print status
> $4 = 7295
> (gdb) print exitcode
> $5 = 1
> (gdb) set radix 16
> (gdb) print status
> $6 = 0x1c7f
> (gdb) print n
> $7 = 0xbfff8000
> 
> also have seen:
> 
> 2.4.24-1um + reboot-signals
> 
>   Checking for the skas3 patch in the host...found
>   Checking for /proc/mm...found
>   CONFIG_HIGHMEM not enabled - physical memory shrunk to 499122176 bytes
>   Kernel virtual memory size shrunk to 32505856 bytes
>   capture_stack : Expected SIGSTOP, got status = 0x1c7f
> 
> 
> 2.4.26-3um
> 
>   Checking for the skas3 patch in the host...found
>   Checking for /proc/mm...found
>   capture_stack : Expected SIGSTOP, got status = 0x1c7f
> 
> 

-- 
Damn it! Morons don't learn until they die! -- Faye Valentine, _Cowboy Bebop, The 
Movie_.

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#!/bin/bash 

declare -i idx= first=1

rm -rf   /local/target0/umltest
mkdir -p /local/umltest/cow
mkdir -p /local/umltest/hostfs

if (( $# < 1 )); then
    idx=1
else
    idx=$1
fi

root="/local/dbahi/root_fs.rh-9-full"
swap="/local/dbahi/swap_fs.256"
pipe="/local/umltest/pipe"

linux="/view/dmerrill_linux/ccase/linux24/src/linux"

if [[ ! -x "${linux}" ]]; then
  echo -ne "${linux}\n\nnot found or not executable!!!!\n"
  exit
fi

pause=5
mem="128M"
nice="nice"
screen="screen -DmS"
xterm="xterm -e screen -r"
tunctl="tunctl -b -u $USER"

echo -ne "\n#  Will launch $idx UML(s)...\n#\n#"
echo -ne "\n#  Launching tunctl for tap interface with command:\n#"
echo -ne "\n#     ${tunctl}\n#\n#"

tapdev=$(${tunctl})

umlxcmd="/usr/bin/uml_switch -unix ${pipe} -tap ${tapdev}"
tunrm="tunctl -d ${tapdev}"

echo -ne "\n#  Launching uml_switch with command:\n#"
echo -ne "\n#     ${screen} uml_switch -t uml_switch ${umlxcmd}\n#\n#"
echo -ne "\n#  Attaching uml_switch with command:\n#"
echo -ne "\n#     ${xterm} uml_switch\n#\n#"

${screen} uml_switch -t uml_switch ${umlxcmd} &
${xterm} uml_switch &

cur=1
while (( $cur <= $idx )); do
    umid="uml_${cur}"
    mac=$(echo "ibase=10; obase=16; ${cur}" | bc)
    ubd0cow="/local/umltest/cow/ubd0_${cur}"
    ubd1cow="/local/umltest/cow/ubd1_${cur}"
    hfsdir="/local/umltest/hostfs/host_${cur}"
    eth="daemon,fe:fd:00:00:00:${mac},unix,${pipe}"

    cmd="${nice} ${linux} umid=${umid} ubd0=${ubd0cow},${root} ubd1=${ubd1cow},${swap} hostfs=${hfsdir} mem=${mem} eth0=${eth}"

    if (( $first > 0 )); then
        first=0
        echo -ne "\n#  Launching UML with commands like:\n#"
        echo -ne "\n#     ${screen} ${umid} -t ${umid} ${cmd}\n#\n#"
        echo -ne "\n#  Attaching UML with commands like:\n#"
        echo -ne "\n#     ${xterm} ${umid}\n#\n#"
        echo -ne "\n#  Use the following to shutdown:\n\n\n"
        echo -ne "pkill uml_switch\n\n"
    fi
    echo -ne "uml_mconsole ${umid} halt"

    mkdir -p ${hfsdir}
    ${screen} ${umid} -t ${umid} ${cmd} &
    ${xterm} ${umid} &

    if (( $cur < $idx )); then
        echo -ne "    # pausing .";
        slept=0
        while (( $slept < $pause )); do
            sleep 1
            echo -ne "."
            slept=$((slept + 1))
        done
    fi
    echo -ne "\n"
    cur=$((cur + 1))
done

echo -ne "\n$tunrm\n"

echo -ne "\n\n#  Done.\n"

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