Bug#399113: xen kernel infinite loop processing core dump

2007-01-13 Thread Loïc Minier 
tags 399113 + confirmed
stop

On Fri, Jan 12, 2007, Knock, Bob wrote:
 If you enable core dumps, I would expect to see the described crash when using
 a broken kernel, and Aborted (core dumped) when using a working one.

 Oh, my mistake, indeed I forgot to follow this step and I reproduce the
 crash now.

-- 
Loïc Minier [EMAIL PROTECTED]

Bug#399113: xen kernel infinite loop processing core dump

2007-01-12 Thread Loïc Minier 
Hi,

On Thu, Nov 30, 2006, Knock, Bob wrote:
 Duplicated with linux-image-2.6.18-3-xen-686.
 Does not occur with the 2.6.16.29-xen kernel pulled from Xen 3.0.3 LiveCD.
 Has anyone else duplicated this? Would there be any benefit to posting a 
 VMWare image?

 Hmm, I tried reproducing your bug in a vmware, and was not able to.  Do
 you still get the bug?

 I installed a vanilla Etch system from the daily business card ISO,
 dist-upgraded to sid, installed xen-linux-system-2.6.18-3-xen-686
 version 2.6.18-8, rebooted, installed build-essential, built crash.c.

 ./crash results in Aborted, and only that, nothing new in dmesg.

   Bye,
-- 
Loïc Minier [EMAIL PROTECTED]

Bug#399113: xen kernel infinite loop processing core dump

2007-01-12 Thread Knock, Bob 
 Hmm, I tried reproducing your bug in a vmware, and was not able to.  Do
 you still get the bug?
Yes, it still happens for me using 2.6.18-8.

 ./crash results in Aborted, and only that, nothing new in dmesg.
It would do that if you failed to enable core dumps via ulimit -c unlimited.

If you enable core dumps, I would expect to see the described crash when using
a broken kernel, and Aborted (core dumped) when using a working one.

Bob

Bug#399113: xen kernel infinite loop processing core dump

2007-01-06 Thread Janusz Krzysztofik 
Dnia piątek, 5 stycznia 2007 02:41, Janusz Krzysztofik napisał:
 I always get:
qemu:~# ./crash
Aborted (core dumped)
qemu:~#
 and nothing in logs.

But on my i386 laptop it realy breaks the system.

Janusz

Bug#399113: xen kernel infinite loop processing core dump

2007-01-05 Thread Knock, Bob 
 I am not able to reproduce this bug on my Core2 Duo (2GB RAM)
 PC running linux-image-2.6.18-3-xen-amd64 with amd64 etch.
 - linux-image-2.6.18-3-i386 and linux-image-2.6.18-3-k7 (2.6.18-7)

Did you try the -xen-686 flavor?

I have not seen anyone actually explicitly confirm that the debian kernel team
reproduced it, but http://lists.debian.org/debian-kernel/2006/12/msg00347.html 
and http://lists.debian.org/debian-kernel/2006/12/msg00488.html indicate they
did, and are able to avoid the problem by enabling PAE.

Bob

Bug#399113: xen kernel infinite loop processing core dump

2007-01-05 Thread Janusz Krzysztofik 
Dnia piątek, 5 stycznia 2007 19:30, Knock, Bob napisał:
  - linux-image-2.6.18-3-i386 and linux-image-2.6.18-3-k7 (2.6.18-7)

 Did you try the -xen-686 flavor?

Yes, I meant -xen-686 and -xen-k7 flawours, sorry for my mistake.

Janusz

Bug#399113: xen kernel infinite loop processing core dump

2007-01-04 Thread Janusz Krzysztofik 
Dnia czwartek, 30 listopada 2006 23:47, Knock, Bob napisał:
 Has anyone else duplicated this?

I am not able to reproduce this bug on my Core2 Duo (2GB RAM)
PC running linux-image-2.6.18-3-xen-amd64 with amd64 etch.
I have also tried to reproduce it on qemu running i386 etch in different 
configurations:
- qemu (Pentium II) and qemu-system-x86_64 (both without kqemu),
- single and dual processor,
- different memory sizes from 128 to 2000 MB,
- linux-image-2.6.18-3-i386 and linux-image-2.6.18-3-k7 (2.6.18-7)

I always get:
   qemu:~# ./crash
   Aborted (core dumped)
   qemu:~# 
and nothing in logs.

Janusz

Bug#399113: xen kernel infinite loop processing core dump

2006-11-30 Thread Knock, Bob 
Duplicated with linux-image-2.6.18-3-xen-686.

Does not occur with the 2.6.16.29-xen kernel pulled from Xen 3.0.3 LiveCD.

Has anyone else duplicated this? Would there be any benefit to posting a VMWare 
image?

Bug#399113: xen kernel infinite loop processing core dump

2006-11-17 Thread Knock, Bob 
Package: linux-image-2.6.18-2-xen-686
Version: 2.6.18-5
Severity: critical

Executing program crash with core dumps enabled (ulimit -c unlimited) results 
in kernel looping the following message:

Bad pte = 0033e0a0, process = crash, vm_flags = 100070, vaddr = b7602000
 [c0144b5d] vm_normal_page+0x98/0xb0
 [c0145116] follow_page+0xe8/0x182
 [c0146b49] get_user_pages+0x288/0x2f1
 [c017b1db] elf_Core_dump+0x972/0xb4b
 [c015ee74] do_coredump+0x4a8/0x4fc
 [c012399c] dequeue_signal+0x15/0x9c
 [c0123fed] get_signal_to_deliver+0x39e/0x3d0
 [c0103ee7] do_notify_resume+0x71/0x5e9
 [c0156153] __fput+0x11c/0x13f
 [c0151fd6] kmem_cache_free+0x44/0x7d
 [c0110b5a] do_page_fault+0x39f/0x7c8
 [c012449f] sys_rt_sigprocmask+0x4b/0xc5
 [c012449f] sys_rt_sigprocmask+0x4b/0xc5
 [c01048b5] work_notifysig+0x13/0x1a

repeats infinitely

The program aborts and dumps core without issue with the kernel from 
linux-image-2.6.18-2-686.

The system is a Sarge machine with enough packages pulled from unstable to 
install xen-linux-system-2.6.18-2-xen-686. I have triggered the problem both in 
Dom0 and a DomU, on both real hardware (opteron) and inside VMWare (p4).

gcc crash.c -o crash -ldl -lpthread

crash.c (any library appears to work equivalently in the dlopen):
-
#include dlfcn.h
#include pthread.h
#include stdlib.h
#include unistd.h

void* crash(void* arg)
{
dlopen(libm.so.6, RTLD_LAZY);
abort();
return 0;
}

int main(int argc, char** argv)
{
pthread_t t;

pthread_create(t, NULL, crash, NULL);

while (1)
{
usleep(10);
}
return (0);
}