Created attachment 1022939 [details]
File: backtrace

Created attachment 1022940 [details]
File: cgroup

Created attachment 1022941 [details]
File: core_backtrace

Created attachment 1022942 [details]
File: dso_list

Created attachment 1022943 [details]
File: environ

Created attachment 1022944 [details]
File: limits

Created attachment 1022945 [details]
File: maps

Created attachment 1022946 [details]
File: open_fds

Created attachment 1022948 [details]
File: proc_pid_status

Created attachment 1022949 [details]
File: exploitable

Created attachment 1022950 [details]
File: ssdt9.dat

This message is a reminder that Fedora 20 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 20. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '20'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora 20 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events. Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

Created attachment 1033510 [details]
Proposed patch

The attached patch will be sent upstream as a proposed fix; several places use the Target pointer in dmcstyle.c without checking whether or not it is non-null, causing the segfault.  It's not clear this is the proper way to fix this problem, however -- it would appear that Target is not being set in some cases where it should be so perhaps upstream has a better long-term answer.

Would it be possible to get a copy of acpidump output so we can have the full set of tables?  Upstream thinks the issue may be with tables external to this SSDT.  To get these tables, you can do something like this:

   $ sudo acpidump -c -o full.tables

Thanks.

acpica-tools-20150515-2.fc22 has been submitted as an update for Fedora 22.
https://admin.fedoraproject.org/updates/acpica-tools-20150515-2.fc22

acpica-tools-20150515-2.fc21 has been submitted as an update for Fedora 21.
https://admin.fedoraproject.org/updates/acpica-tools-20150515-2.fc21

Created attachment 1034833 [details]
$ sudo acpidump -c -o full.tables

Package acpica-tools-20150515-2.fc22:
* should fix your issue,
* was pushed to the Fedora 22 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing acpica-tools-20150515-2.fc22'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2015-9530/acpica-tools-20150515-2.fc22
then log in and leave karma (feedback).

Modification is not enough

----------------------------------------------------------
[root@localhost acpi]# cat get-acpi-info.sh 
----------------------------------------------------------
#!/bin/sh
# Author: Lekensteyn <lekensteyn>
# This script is released into public domain, do whatever you want with it
# Version history:
# 2012-01-08: Initial release
# 2012-01-08 21:42 UTC: Update bug reporting URL
err=false
if ! dmidecode -V >/dev/null; then
        echo "Please install dmidecode"
        err=true
fi
if ! acpidump -h >/dev/null; then
        echo "Please install acpidump"
        err=true
fi
if ! sudo -V >/dev/null; then
        sudo() {
                echo "Running command as root: $*"
                su -c "$*"
        }
fi
$err && exit

cd "$(mktemp -d)"

echo "Dumping ACPI tables..."
sudo acpidump -c -o acpidump.txt

acpixtract acpidump.txt
# everything can be retrieved from the dump, iasl is not mandatory
iasl -h >/dev/null && for i in *.dat; do iasl -d "$i"; done
# clear the file

echo "Gathering computer model and BIOS version..."
: > dmidecode.txt
info="system-manufacturer system-product-name system-version"
info="$info baseboard-manufacturer baseboard-product-name baseboard-version"
info="$info bios-vendor bios-version bios-release-date"
for key in $info;do printf "%-22s: %s\n" $key "$(sudo dmidecode -s $key)" >>dmidecode.txt;done

echo "Dumping PCI information..."
lspci -vvvnn > lspci.txt
name="$(head -2 dmidecode.txt | sed 's/ *$//;s/^[^:]*: *//;s/[^A-Za-z0-9.,-]/_/g' | tr '\n' - | sed 's/-$//')"
mkdir -p "$name" && cp *.dsl *.txt "$name"

tar czf "$name.tar.gz" "$name"

echo "Please submit the below file on https://bugs.launchpad.net/lpbugreporter/+bug/752542/+addcomment"
ls -l "$PWD/$name.tar.gz"
----------------------------------------------------------

Result: Segmentation fault
...

Reading ACPI table from file  ssdt9.dat - Length 00003102 (0x000C1E)
ACPI: SSDT 0x0000000000000000 000C1E (v01 SgRef  SgPch    00001000 INTL 20120711)
Acpi table [SSDT] successfully installed and loaded
Pass 1 parse of [SSDT]
Pass 2 parse of [SSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)

Parsing completed
ACPI Error: External method arg count mismatch _SB_.PCI0.LPCB.EC0_.WRAM: Current 2, attempted 7 (20150515/dmextern-819)
ACPI Error: External method arg count mismatch _SB_.PCI0.LPCB.EC0_.WRAM: Current 2, attempted 7 (20150515/dmextern-819)
ACPI Error: External method arg count mismatch _SB_.PCI0.LPCB.EC0_.WRAM: Current 2, attempted 5 (20150515/dmextern-819)

Found 4 external control methods, reparsing with new information
Pass 1 parse of [SSDT]
Pass 2 parse of [SSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)

Parsing completed
get-acpi-info.sh: line 31:  2649 Segmentation fault      (core dumped) iasl -d "$i"

...

acpica-tools-20150515-2.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

acpica-tools-20150515-2.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.