Public bug reported:

After upgrading to Jaunty when booting with the 2.6.28 kernel some applications 
starts to crash in different ways and sometimes resulting in that 
the computer freezes. Booting with 2.6.27 there is none of those problems.


1)
$ lsb_release -rd
Description:    Ubuntu 9.04
Release:        9.04

$ uname -a
Linux markuz 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC 2009 
x86_64 GNU/Linux

2)
$ apt-cache policy linux-image-generic
linux-image-generic:
  Installed: 2.6.28.11.15
  Candidate: 2.6.28.11.15
  Version table:
 *** 2.6.28.11.15 0
        500 http://se.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status

$ apt-cache policy firefox
firefox:
  Installed: 3.0.10+nobinonly-0ubuntu0.9.04.1
  Candidate: 3.0.10+nobinonly-0ubuntu0.9.04.1
  Version table:
 *** 3.0.10+nobinonly-0ubuntu0.9.04.1 0
        500 http://se.archive.ubuntu.com jaunty-updates/main Packages
        500 http://security.ubuntu.com jaunty-security/main Packages
        100 /var/lib/dpkg/status
     3.0.8+nobinonly-0ubuntu3 0
        500 http://se.archive.ubuntu.com jaunty/main Packages

$ apt-cache policy thunderbird
thunderbird:
  Installed: 2.0.0.21+nobinonly-0ubuntu1.9.04.1
  Candidate: 2.0.0.21+nobinonly-0ubuntu1.9.04.1
  Version table:
 *** 2.0.0.21+nobinonly-0ubuntu1.9.04.1 0
        500 http://se.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status

3) What I expected to happen:
        Firefox and thunderbird should run without crashing as when using the 
2.6.27 kernel.

4) What happened instead:

        After some (random) time firefox and thunderbird (and sometimes some 
other applications but I have 
        not been able to reproduce that) stops working either by a segfault, 
illegal instruction, trap invalid op code, 
        dumping ftrace and/or computer freeze with or without flashing 
caps/scroll lock buttons.


Crash 1)
$ firefox
Some pages loaded then the computer freezed with Caps lock and scroll lock 
flashing. Pressed the power button to shutdown.

Nothing special in /var/log/messages. Last message was:
May 16 17:26:59 markuz syslogd 1.5.0#5ubuntu3: restart.


Crash 2)
$ firefox
After some longer time the computer freezed again, this time without flashing 
lights.
This time with ftrace buffer dumpted in syslog.


Crash 3)
$ firefox
Directly after choosen firefox profile:
Illegal instruction

$ firefox
Illegal instruction

$ firefox
Illegal instruction

Got 2 invalid opcode messages in dmesg.

$ thunderbird&
[2] 5355
After looked at some e-mails:
Segmentation fault
[2]+  Exit 139                thunderbird

$ thunderbird &
[2] 5604
Segmentation fault
[2]+  Exit 139                thunderbird

$ thunderbird &
Segmentation fault
[2]+  Exit 139                thunderbird


I rebooted Ubuntu using the menu as I could not use firefox and thunderbird.


Crash 4)
$ firefox
After choosen firefox profile:
[2]+  Segmentation fault      firefox


$ firefox &
[2] 5104
[2]+  Segmentation fault      firefox

$ firefox &
[2] 5118
[2]+  Segmentation fault      firefox

$ gdb /usr/lib/firefox-3.0.10/firefox
(see attachment)
gdb crashed with Segmentation fault

/var/log/messages:
May 16 19:00:06 markuz kernel: [  897.120652] gdb[5189]: segfault at 0 ip 
000000000046b557 sp 00007fff7581b028 error 6 in gdb[400000+360000]
May 16 19:01:02 markuz kernel: [  953.392252] gdb[5435]: segfault at 0 ip 
000000000046b557 sp 00007fffda8df118 error 6 in gdb[400000+360000]


Crash 5)
$ firefox &
After some longer time (had time to almost write the whole bugreport) the 
computer freezed with flashing caps and scroll lock.

Some ACPI errors and this in syslog:
[ 1299.617487] npviewer.bin[6006]: segfault at ff9bea2c ip 00000000ff9bea2c sp 
00000000ffa0880c error 14

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
segfaults in firefox, thunderbird, computer freezes and illegal instructions 
with 2.6.28-11-generic kernel in jaunty
https://bugs.launchpad.net/bugs/377530
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