Re: ax25 rose Re: kernel panic linux-2.6.27-rc7

["Bernard, f6bvp" <f6bvp@free.fr>]

Hi Jarek,

Finally I am able to access the faulty 2.6.27-rc7 f6bvp-9 system via
ssh.
I can read /var/log/kernel/message file immediately after a kernel
failure and a reboot. 
When this is done, the system is stable until I start FPAC suite
applications (fpad, fpacwpd ...) as shown below.

Oct  2 16:50:00 f6bvp-9 kernel: AX25_DBG: c36fc338, 00000000, 1, 0, 0
Oct  2 16:50:00 f6bvp-9 kernel: AX25_DBG: c36fc008, 00000000, 1, 1, 0
Oct  2 16:50:00 f6bvp-9 kernel: AX25_DBG: c36fc338, 00000000, 1, 0, 0
Oct  2 16:50:00 f6bvp-9 kernel: AX25_DBG: c36fc008, 00000000, 1, 1, 0
Oct  2 16:50:09 f6bvp-9 fpad: starting FPAD
Oct  2 16:50:09 f6bvp-9 kernel: AX25_DBG: c691a688, 00000000, 2, 2, 17
Oct  2 16:50:09 f6bvp-9 kernel: AX25_DBG: c15245f0, 00000000, 11, 5, 0
Oct  2 16:50:09 f6bvp-9 kernel: AX25_DBG: c691a688, 00000000, 2, 2, 17
Oct  2 16:50:09 f6bvp-9 kernel: AX25_DBG: c691a688, 00000000, 2, 2, 17
Oct  2 16:50:09 f6bvp-9 fpad: FPAD becomes a daemon 
Oct  2 16:50:09 f6bvp-9 fpacwpd[5169]: Starting
Oct  2 16:50:09 f6bvp-9 kernel: AX25_DBG: c691a688, 00000000, 2, 2, 17
Oct  2 16:50:10 f6bvp-9 last message repeated 6 times
Oct  2 16:50:10 f6bvp-9 ax25ipd: assemble_kiss: dumped - control byte
non-zero 
Oct  2 16:50:10 f6bvp-9 kernel: mkiss: ax4: Trying crc-smack
Oct  2 16:50:10 f6bvp-9 kernel: AX25_DBG: c691a688, 00000000, 2, 2, 17
Oct  2 16:50:10 f6bvp-9 last message repeated 7 times
Oct  2 16:50:10 f6bvp-9 fpad: FPAD opened WP service 
Oct  2 16:50:11 f6bvp-9 ax25ipd: assemble_kiss: dumped - control byte
non-zero 
Oct  2 16:50:11 f6bvp-9 kernel: mkiss: ax4: Trying crc-flexnet
Oct  2 16:50:11 f6bvp-9 kernel: mkiss: ax0: Trying crc-smack
Oct  2 16:50:13 f6bvp-9 kernel: AX25_DBG: c1520630, 00000000, 11, 5, 0
Oct  2 16:50:16 f6bvp-9 ax25ipd: from_kiss: dumped - cannot figure out
where to send this! 
Oct  2 16:50:16 f6bvp-9 kernel: mkiss: ax0: Trying crc-flexnet
Oct  2 16:50:18 f6bvp-9 ax25ipd: from_kiss: dumped - cannot figure out
where to send this! 
Oct  2 16:50:21 f6bvp-9 kernel: AX25_DBG: c36090e0, 00000000, 3, 2, 207
Oct  2 16:50:21 f6bvp-9 kernel: mkiss: ax1: Trying crc-smack
Oct  2 16:50:22 f6bvp-9 ax25ipd: from_kiss: dumped - cannot figure out
where to send this! 
Oct  2 16:50:25 f6bvp-9 kernel: AX25_DBG: c14662d0, 00000000, 11, 5, 0
Oct  2 16:50:26 f6bvp-9 kernel: mkiss: ax1: Trying crc-flexnet
Oct  2 16:50:28 f6bvp-9 kernel: AX25_DBG: c4cd0a68, 00000000, 11, 5, 0
Oct  2 16:50:28 f6bvp-9 ax25ipd: from_kiss: dumped - cannot figure out
where to send this! 
Oct  2 16:50:30 f6bvp-9 kernel: AX25_DBG: c691a688, 00000000, 2, 2, 17
Oct  2 16:50:30 f6bvp-9 last message repeated 2 times
Oct  2 16:50:31 f6bvp-9 ax25ipd: from_kiss: dumped - cannot figure out
where to send this! 
Oct  2 16:50:31 f6bvp-9 kernel: AX25_DBG: c146a5d0, 00000000, 11, 5, 0
Oct  2 16:50:31 f6bvp-9 kernel: AX25_DBG: c36090e0, 00000000, 3, 2, 207
Oct  2 16:50:31 f6bvp-9 kernel: mkiss: ax3: Trying crc-smack
Oct  2 16:50:33 f6bvp-9 ax25ipd: from_kiss: dumped - cannot figure out
where to send this! 
Oct  2 16:53:21 f6bvp-9 syslogd 1.4.2: restart.
Oct  2 16:53:22 f6bvp-9 kernel: klogd 1.4.2, log source = /proc/kmsg
started.
Oct  2 16:53:23 f6bvp-9 kernel: Linux version 2.6.27-rc7 (root@f6bvp-9)
(gcc version 4.2.2 20071128 (prerelease) (4.2.2-3.1mdv2008.0)) #3 Tue
Sep 30 10:55:01 CEST 2008
Oct  2 16:53:23 f6bvp-9 kernel: BIOS-provided physical RAM map:
Oct  2 16:53:23 f6bvp-9 kernel:  BIOS-e820: 0000000000000000 -
00000000000a0000 (usable)
Oct  2 16:53:23 f6bvp-9 kernel:  BIOS-e820: 00000000000f0000 -
0000000000100000 (reserved)
Oct  2 16:53:23 f6bvp-9 kernel:  BIOS-e820: 0000000000100000 -
0000000008000000 (usable)
Oct  2 16:53:23 f6bvp-9 kernel:  BIOS-e820: 00000000ffff0000 -
0000000100000000 (reserved)
Oct  2 16:53:23 f6bvp-9 kernel: last_pfn = 0x8000 max_arch_pfn =
0x100000
Oct  2 16:53:23 f6bvp-9 kernel: RAMDISK: 07f2a000 - 07fef581
 
Although I did not change anything, and contrarily to my previous
observation, the system instability as shown above occurs
systematically.
There was no problem with Kernel 2.6.25-10 I was using before (with
patches for AX25 and ROSE that are now included in 2.6.27-rc7).
I did not try 2.6.26 on this machine, thus I cannot tell if the bug was
already present.
Would it be worth to test 2.6.26 ?   
With the SSH limited access I have from my remote site, can I continue
this debuging effort constructively, or do we wait until I am back in
front of the local console ?

Bernard  

Le mercredi 01 octobre 2008 à 05:58 +0000, Jarek Poplawski a écrit :
> On Wed, Oct 01, 2008 at 12:49:02AM +0200, Bernard Pidoux F6BVP wrote:
> > Jarek,
> >
> > With the patch #2, there have been only one reboot after the machine was  
> > frozen. I did not notice that was happening for there was no kernel  
> > panic message but a frozen display only.
> > Then I could only write down partially the values displayed after  
> > AX25_DBG: c446c220, c..... 3, 5, 240
> > Second number was not 000000 as it is most of the time.
> > The machine rebooted after the usual 60 seconds delay and since then  
> > there was no kernel panic.
> > This is the first time kernel 2.6.27-rc7 does not panic within a minute.
> > The system is up since about 20 minutes now with frequent AX25_DBG messages.
> 
> Hmm... Since this was intended mainly for debugging something went
> wrong. (I expected to get at least one warning.)
> 
> >
> > I am sorry that I must go to sleep now to be at work early in the morning.
> > I will be away from my Linux box for a few days.
> > Then we should probably interrupt this interesting bug hunting.
> > I will send more results when I am back.
> 
> OK, I'll try to look at this in the meantime.
> 
> Cheers,
> Jarek P.
>