[uml-devel] UML kernel panic

[uml-devel] UML kernel panic

[Frank Sorenson]

I'm getting a UML kernel panic whenever I run the j2eesdk (Java with EJB -
http://java.sun.com/j2ee/1.4/download.html#sdk) installer.  The panic is 
"Segfault with no mm".

I tried running the latest supported version (2.4.24-2), and I got several
backtraces of the crash:
http://sco.tuxrocks.com/uml/trace5.txt
http://sco.tuxrocks.com/uml/trace6.txt
http://sco.tuxrocks.com/uml/trace7.txt

The config file is at http://sco.tuxrocks.com/uml/config

Any ideas or suggestions?  Any help would be greatly appreciated.

Thanks,

Frank
---------------------------------------------------------------------------
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank@tuxrocks.com



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Re: [uml-devel] UML kernel panic

[roland]

hi!
yesterday in installed tomcat on a uml 2.6.4 with suse9 rootfs.
tomcat needs jre1.4 and jdk1.4 rpm`s.
all demo jsp`s and demo servlets run fine - so basically java works.
are there any known uml java issues besides the ones reported by frank ?
i would like to create an development environment for some programmers, 
where everybody should have his own machine with his own tomcat - so 
i`m a little bit unsure, if it is stable enough. 

regards
roland


----- Original Message ----- 
From: "Frank Sorenson" <frank@tuxrocks.com>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Saturday, May 01, 2004 10:49 PM
Subject: [uml-devel] UML kernel panic


> I'm getting a UML kernel panic whenever I run the j2eesdk (Java with EJB -
> http://java.sun.com/j2ee/1.4/download.html#sdk) installer.  The panic is 
> "Segfault with no mm".
> 
> I tried running the latest supported version (2.4.24-2), and I got several
> backtraces of the crash:
> http://sco.tuxrocks.com/uml/trace5.txt
> http://sco.tuxrocks.com/uml/trace6.txt
> http://sco.tuxrocks.com/uml/trace7.txt
> 
> The config file is at http://sco.tuxrocks.com/uml/config
> 
> Any ideas or suggestions?  Any help would be greatly appreciated.
> 
> Thanks,
> 
> Frank
> ---------------------------------------------------------------------------
> Frank Sorenson - KD7TZK
> Systems Manager, Computer Science Department
> Brigham Young University
> frank@tuxrocks.com
> 
> 
> 
> -------------------------------------------------------
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Re: [uml-devel] UML kernel panic

[Frank Sorenson]

On Sat, 1 May 2004, roland wrote:

> hi!
> yesterday in installed tomcat on a uml 2.6.4 with suse9 rootfs.
> tomcat needs jre1.4 and jdk1.4 rpm`s.
> all demo jsp`s and demo servlets run fine - so basically java works.
> are there any known uml java issues besides the ones reported by frank ?
> i would like to create an development environment for some programmers, 
> where everybody should have his own machine with his own tomcat - so 
> i`m a little bit unsure, if it is stable enough. 

This is very similar to the environment that I'm working on, which is a
java development environment for students to design and build "Enterprise"  
systems.  Other than this particular bug, I've found UML to be quite
stable.

Any ideas on what's causing UML kernel panics, and thoughts on how to fix
it would be greatly appreciated.  Can the UML kernel panics be caused by
host kernel or system problems, or is it likely a UML kernel problem, or
is there something else?

Thanks,

Frank
---------------------------------------------------------------------------
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank@tuxrocks.com



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Re: [uml-devel] UML kernel panic

[Henrik Nordstrom]

On Mon, 3 May 2004, Frank Sorenson wrote:

> Any ideas on what's causing UML kernel panics, and thoughts on how to fix
> it would be greatly appreciated.  Can the UML kernel panics be caused by
> host kernel or system problems, or is it likely a UML kernel problem, or
> is there something else?

What does the panics say? Preferably including a gdb backtrace..

Regards
Henrik



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Re: [uml-devel] UML kernel panic

[Frank Sorenson]

On Mon, 3 May 2004, Henrik Nordstrom wrote:
> On Mon, 3 May 2004, Frank Sorenson wrote:
> 
> > Any ideas on what's causing UML kernel panics, and thoughts on how to fix
> > it would be greatly appreciated.  Can the UML kernel panics be caused by
> > host kernel or system problems, or is it likely a UML kernel problem, or
> > is there something else?
> 
> What does the panics say? Preferably including a gdb backtrace..

The panics are "Segfault with no mm"

gdb backtraces can be found here:
http://sco.tuxrocks.com/uml/trace6.txt
http://sco.tuxrocks.com/uml/trace7.txt

A copy of the config file (2.4.24-2 UML kernel) is here:
http://sco.tuxrocks.com/uml/config


Thanks for the help,

Frank
---------------------------------------------------------------------------
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank@tuxrocks.com



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Re: [uml-devel] UML kernel panic

[Henrik Nordstrom]

On Mon, 3 May 2004, Frank Sorenson wrote:

> The panics are "Segfault with no mm"
> 
> gdb backtraces can be found here:
> http://sco.tuxrocks.com/uml/trace6.txt
> http://sco.tuxrocks.com/uml/trace7.txt

Unfortunately both of these traces are incomplete and only shows what 
happened after the segfault, not where the segfault occurred.

But it does look like a UML problem. The reason to panic is a segfault 
while trying to resolve a VM page fault. But it would be interesting to 
know what/where triggered the first page fault.

Regards
Henrik



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Re: [uml-devel] UML kernel panic

[Frank Sorenson]

On Mon, 3 May 2004, Henrik Nordstrom wrote:
> On Mon, 3 May 2004, Frank Sorenson wrote:
> 
> > The panics are "Segfault with no mm"
> > 
> > gdb backtraces can be found here:
> > http://sco.tuxrocks.com/uml/trace6.txt
> > http://sco.tuxrocks.com/uml/trace7.txt
> 
> Unfortunately both of these traces are incomplete and only shows what 
> happened after the segfault, not where the segfault occurred.
> 
> But it does look like a UML problem. The reason to panic is a segfault 
> while trying to resolve a VM page fault. But it would be interesting to 
> know what/where triggered the first page fault.

I believe I know why the traces didn't have more information.  Reminder to
trace the binary, not a symlink pointing to it.

This time, I got a different panic while doing the same thing as before:
Kernel panic: Kernel mode fault at addr 0xfffe0012, ip 0x40000c20

A trace is at http://sco.tuxrocks.com/uml/trace10.txt 
(http://sco.tuxrocks.com/uml/trace9.txt may also be helpful).

The kernel panics occur while running the j2eesdk installer, and happen at 
the same point each time:
[root@uml12 tmp]# ./j2eesdk-1_4-linux.bin -console
Checking available disk space...
Checking Java(TM) 2 Runtime Environment...
Extracting Java(TM) 2 Runtime Environment files...
Extracting installation files...
Launching Java(TM) 2 Runtime Environment...
Kernel panic: Kernel mode fault at addr 0xfffe0012, ip 0x40000c20

The odd thing is that often (not always), the system appears to hang after
"Launching Java(TM) 2 Runtime Environment...", until I ssh into the UML.  
When I hit enter after typing the root password, the panic occurs.  The 
rest of the time, ssh works just fine.

Thanks for the help,

Frank
---------------------------------------------------------------------------
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank@tuxrocks.com



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Re: [uml-devel] UML kernel panic

[Frank Sorenson]

On Mon, 3 May 2004, Frank Sorenson wrote:
<snip>
> The odd thing is that often (not always), the system appears to hang after
> "Launching Java(TM) 2 Runtime Environment...", until I ssh into the UML.  
> When I hit enter after typing the root password, the panic occurs.  The 
> rest of the time, ssh works just fine.

Okay, it's not ssh.  Once the system gets into the odd state (appears to 
hang), the panic occurs when the first process is created (ls, ps, ssh 
forking, etc.).  Prior to this time, though, everything seems okay.

Idling while waiting for me to create a new process:
http://sco.tuxrocks.com/uml/trace14.txt

As soon as a new process is created (well, as soon as the system _tries_ 
to create a new process), it seems to panic:
http://sco.tuxrocks.com/uml/trace13.txt
http://sco.tuxrocks.com/uml/trace15.txt


Frank
---------------------------------------------------------------------------
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank@tuxrocks.com




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Re: [uml-devel] UML kernel panic

[roland]

hi!
installed j2eesdk-1_4-linux.bin

no problem here!

uml:
kernel: linux-2.6.4-uml2641-pomng20040311-gcc333-fixed-coredump
(from http://www.stearns.org/uml/)
rootfs: suse9

host:
suse9 + skas

regards
roland


----- Original Message ----- 
From: "Frank Sorenson" <frank@tuxrocks.com>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Monday, May 03, 2004 7:02 PM
Subject: Re: [uml-devel] UML kernel panic


> On Mon, 3 May 2004, Henrik Nordstrom wrote:
> > On Mon, 3 May 2004, Frank Sorenson wrote:
> > 
> > > The panics are "Segfault with no mm"
> > > 
> > > gdb backtraces can be found here:
> > > http://sco.tuxrocks.com/uml/trace6.txt
> > > http://sco.tuxrocks.com/uml/trace7.txt
> > 
> > Unfortunately both of these traces are incomplete and only shows what 
> > happened after the segfault, not where the segfault occurred.
> > 
> > But it does look like a UML problem. The reason to panic is a segfault 
> > while trying to resolve a VM page fault. But it would be interesting to 
> > know what/where triggered the first page fault.
> 
> I believe I know why the traces didn't have more information.  Reminder to
> trace the binary, not a symlink pointing to it.
> 
> This time, I got a different panic while doing the same thing as before:
> Kernel panic: Kernel mode fault at addr 0xfffe0012, ip 0x40000c20
> 
> A trace is at http://sco.tuxrocks.com/uml/trace10.txt 
> (http://sco.tuxrocks.com/uml/trace9.txt may also be helpful).
> 
> The kernel panics occur while running the j2eesdk installer, and happen at 
> the same point each time:
> [root@uml12 tmp]# ./j2eesdk-1_4-linux.bin -console
> Checking available disk space...
> Checking Java(TM) 2 Runtime Environment...
> Extracting Java(TM) 2 Runtime Environment files...
> Extracting installation files...
> Launching Java(TM) 2 Runtime Environment...
> Kernel panic: Kernel mode fault at addr 0xfffe0012, ip 0x40000c20
> 
> The odd thing is that often (not always), the system appears to hang after
> "Launching Java(TM) 2 Runtime Environment...", until I ssh into the UML.  
> When I hit enter after typing the root password, the panic occurs.  The 
> rest of the time, ssh works just fine.
> 
> Thanks for the help,
> 
> Frank
> ---------------------------------------------------------------------------
> Frank Sorenson - KD7TZK
> Systems Manager, Computer Science Department
> Brigham Young University
> frank@tuxrocks.com
> 
> 
> 
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Re: [uml-devel] UML kernel panic

[Jeff Dike]

frank@tuxrocks.com said:
> I'm getting a UML kernel panic whenever I run the j2eesdk (Java with
> EJB - http://java.sun.com/j2ee/1.4/download.html#sdk) installer.  The
> panic is  "Segfault with no mm". 

Can you disable CONFIG_GCOV and see if that makes the problem go away?  And
mentioning that you had enabled it would have been a good idea.

This is still a bug, but I'd like to make sure that this is the cause.

				Jeff



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Re: [uml-devel] UML kernel panic

[Frank Sorenson]

On Mon, 3 May 2004, Jeff Dike wrote:
> frank@tuxrocks.com said:
> > I'm getting a UML kernel panic whenever I run the j2eesdk (Java with
> > EJB - http://java.sun.com/j2ee/1.4/download.html#sdk) installer.  The
> > panic is  "Segfault with no mm". 
> 
> Can you disable CONFIG_GCOV and see if that makes the problem go away?  And
> mentioning that you had enabled it would have been a good idea.
> 
> This is still a bug, but I'd like to make sure that this is the cause.

I've tried it with and without CONFIG_GCOV, and didn't realize it was on 
currently.  Sorry about that.

Here are several gdb backtraces with CONFIG_GCOV off:
http://sco.tuxrocks.com/uml/trace17.txt [200K]
http://sco.tuxrocks.com/uml/trace18.txt [300K]

When I run the j2eesdk installer under strace, it detects an exception, 
and crashes the VM: http://sco.tuxrocks.com/uml/vm-crash1.txt
(it doesn't seem to panic the UML kernel, though)

The strace is (compressed): http://sco.tuxrocks.com/uml/strace1.txt.gz 
[1.9M]

Thanks for the help,

Frank
---------------------------------------------------------------------------
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank@tuxrocks.com



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[uml-devel] UML kernel panic

[Leigh Porter]

Hiya,

I have UML 2.6.4-1 on a stock SuSE 8.1 box (also tried on 8.1) running 
2.4.19

The system boots fine an dnetworking comes up and works. The system
starts sshd, apache etc however, when the system starts bind9 the
UML kernel panics. This only happens when networking has not been 
brought up,
with networking started named starts fine.

Kernel panic: Kernel mode fault at addr 0x4, ip 0xa0030643
 <6>SysRq : Show Regs

EIP: 0023:[<a0030643>] CPU: 0 Not tainted ESP: 002b:a0b8b8f4 EFLAGS: 
00010202
    Not tainted
EAX: 00000000 EBX: a1e56498 ECX: 00000001 EDX: a1e56504
ESI: a1e56498 EDI: a1c53990 EBP: a0b8b90c DS: 002b ES: 002b
Call Trace: [<a018345e>] [<a001c45f>] [<a008b5f8>] [<a0045b56>] [<a0030643>]
   [<a0037945>] [<a00379c7>] [<a0030643>] [<a001b600>] [<a0030643>] 
[<a001b76d>]
   [<a0030643>] [<a001bce0>] [<a0205505>] [<a00194dd>] [<a001bace>] 
[<a0030643>]
   [<a001ba22>] [<a001f9ac>] [<a001fa25>] [<a001bce0>] [<a02053d8>] 
[<a0030643>]
   [<a0205505>] [<a0019743>] [<a0031b68>] [<a0205505>] [<a00194dd>] 
[<a0205505>]
   [<a001956b>] [<a0205505>] [<a0205505>] [<a00194dd>] [<a0205505>] 
[<a0019648>]
   [<a0094756>] [<a0094935>] [<a0086199>] [<a00864aa>] [<a007a51c>] 
[<a006a4f2>]
   [<a006b69f>] [<a007787d>] [<a0044224>] [<a0045080>] [<a001952d>] 
[<a001947b>]
   [<a001884a>] [<a001e678>] [<a001a28e>] [<a0018a81>] [<a001e801>] 
[<a0016b5a>]
   [<a001f9ac>] [<a001f9f5>] [<a001bce0>] [<a02053d8>]


The gdb bt is:

(gdb) bt
#0  panic (fmt=0xa0257de0 "Kernel mode fault at addr 0x%lx, ip 0x%lx")
    at kernel/panic.c:58
#1  0xa001b76d in segv (address=4, ip=2684552771, is_write=0, is_user=0,
    sc=0xa0932f88) at arch/um/kernel/trap_kern.c:151
#2  0xa001bace in segv_handler (sig=11, regs=0xa0932f88)
    at arch/um/kernel/trap_user.c:67
#3  0xa001f9ac in sig_handler_common_tt (sig=11, sc_ptr=0x58)
    at arch/um/kernel/tt/trap_user.c:37
#4  0xa001bce0 in sig_handler (sig=0, sc=
      {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds = 43,
__dsh = 0, edi = 2696380512, esi = 2716447384, ebp = 2714630412, esp =
2714630388, ebx = 2716447384, edx = 2716447492, ecx = 1, eax = 0, trapno =
14, err = 4, eip = 2684552771, cs = 35, __csh = 0, eflags = 66050,
esp_at_signal = 2714630388, ss = 43, __ssh = 0, fpstate = 0x0, oldmask =
201392128, cr2 = 4})
    at arch/um/kernel/trap_user.c:102
#5  <signal handler called>
#6  0xa0030643 in dump_fpu (regs=0x0, fpu=0xa1e9b298)
    at arch/um/sys-i386/ptrace.c:329
#7  0xa0094756 in elf_dump_thread_status (signr=6, p=0xa0b78060,
    thread_list=0xa1cdf9f4) at include/linux/elfcore.h:115
(gdb)

I can supply a disk image and kernel if required.

Thanks,
Leigh




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