Kernel Panic

FisherKing

As I was typing I wondered if that might be the response I would get. It's always amazing what crazy and unexpected things an end user can come up with. :)

This is a test environment, so I test things.
Comp1 = initial CARP master, XMLRPC master
Comp2 = initial CARP slave, XMLRPC slave

I wanted to know what would happen if Comp1 had an issue and Comp2 took over. Could I also make Comp2 become the XMLRPC master since it was acting as the CARP master? I did clear the XMLRPC settings on Comp1 first. I wouldn't have thought that reversing the roles would cause a panic.

jimp

When a master syncs the config to a slave it makes several alterations in the process.

Just flipping a slave to a master in the XMLRPC settings it going to cause you problems because of this.

If you really want to swap their roles, restore the master's config to the slave box and vice versa.

When a CARP slave takes over automatically - if you have configured everything right - it can function that way indefinitely until you bring the master back up, you just can't make any changes to the slave's config you want to keep. But that is all a topic for another thread. It's not the source of the panic - it's just a Bad Thing.

FisherKing

Good to know - I'll avoid doing that in the future.

pwnell

Ok so I waited until I thought this snapshot would be okaish… Within 10 minutes of installing this my machine crashed:

2.0-BETA5 (i386)
built on Fri Feb 4 15:47:28 EST 2011

Pentium(R) Dual-Core CPU E5400 @ 2.70GHz

[2.0-BETA5][root@fw.home]/root(1): uname -a
FreeBSD fw.home 8.1-RELEASE-p2 FreeBSD 8.1-RELEASE-p2 #1: Fri Feb 4 15:45:20 EST 2011 sullrich@FreeBSD_8.0_pfSense_2.0-snaps.pfsense.org:/usr/obj.pfSense/usr/pfSensesrc/src/sys/pfSense_SMP.8 i386

–---------

Did not do anything special on the firewall when it died.

IMG_0233.JPG_thumb

pwnell

Bt backtrace.

IMG_0234.JPG_thumb

LostInIgnorance

Sorry, I haven't had time to exactly test the new snapshots till now. I loaded it up with 2.0-BETA5 (i386) built on Sun Feb 6 23:54:00 EST 2011. Crashed when trying to use openVPN. This is the P4 Dell machine that was described prior.

Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex em0 (EM TX Lock) r = 0 (0xc2f52580) locked @ /usr/pfSensesrc/src/sys/dev/e1000/if_lem.c:1350
KDB: stack backtrace:
db_trace_self_wrapper(c0eb72bd,ccc3ca90,c0a41f05,546,0,...) at db_trace_self_wrapper+0x26
kdb_backtrace(546,0,ffffffff,c145d504,ccc3cac8,...) at kdb_backtrace+0x29
_witness_debugger(c0eb97d5,ccc3cadc,4,1,0,...) at _witness_debugger+0x25
witness_warn(5,0,c0ef7b9a,14,c131b440,...) at witness_warn+0x20d
trap(ccc3cb68) at trap+0x19e
calltrap() at calltrap+0x6
--- trap 0xc, eip = 0xc0a611ca, esp = 0xccc3cba8, ebp = 0xccc3cbb8 ---
m_tag_delete(c341cd00,dedeadc0,c341cd00,c341cd00,ccc3cbf0,...) at m_tag_delete+0x5a
m_tag_delete_chain(c341cd00,0,c0e6e71f,0,c2ed91e0,...) at m_tag_delete_chain+0x3f
mb_dtor_mbuf(c341cd00,100,0,c0a42958,df,...) at mb_dtor_mbuf+0x35
uma_zfree_arg(c1d7e380,c341cd00,0,1e,ccc3cc84,...) at uma_zfree_arg+0x29
m_freem(c341cd00,4,c0e6e71f,b87,c2f4e000,...) at m_freem+0x43
lem_txeof(c2f52580,0,c0e6e71f,546,c2f525bc,...) at lem_txeof+0x158
lem_handle_rxtx(c2f4e000,1,c0eb8b8e,4f,c2edb8d8,...) at lem_handle_rxtx+0x60
taskqueue_run(c2edb8c0,c2edb8d8,c0ea5f47,0,c0eb21ed,...) at taskqueue_run+0x103
taskqueue_thread_loop(c2f525ec,ccc3cd38,c0eaed5c,344,c131b440,...) at taskqueue_thread_loop+0x68
fork_exit(c0a3b180,c2f525ec,ccc3cd38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xccc3cd70, ebp = 0 ---

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address= 0xdedeadc0
fault code= supervisor read, page not present
instruction pointer= 0x20:0xc0a611ca
stack pointer        = 0x28:0xccc3cba8
frame pointer        = 0x28:0xccc3cbb8
code segment= base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags= interrupt enabled, resume, IOPL = 0
current process= 0 (em0 taskq)
[thread]
Stopped at      m_tag_delete+0x5a:      movl    0(%ecx),%eax
db> bt
Tracing pid 0 tid 64050 td 0xc2f4bc80
m_tag_delete(c341cd00,dedeadc0,c341cd00,c341cd00,ccc3cbf0,...) at m_tag_delete+0x5a
m_tag_delete_chain(c341cd00,0,c0e6e71f,0,c2ed91e0,...) at m_tag_delete_chain+0x3f
mb_dtor_mbuf(c341cd00,100,0,c0a42958,df,...) at mb_dtor_mbuf+0x35
uma_zfree_arg(c1d7e380,c341cd00,0,1e,ccc3cc84,...) at uma_zfree_arg+0x29
m_freem(c341cd00,4,c0e6e71f,b87,c2f4e000,...) at m_freem+0x43
lem_txeof(c2f52580,0,c0e6e71f,546,c2f525bc,...) at lem_txeof+0x158
lem_handle_rxtx(c2f4e000,1,c0eb8b8e,4f,c2edb8d8,...) at lem_handle_rxtx+0x60
taskqueue_run(c2edb8c0,c2edb8d8,c0ea5f47,0,c0eb21ed,...) at taskqueue_run+0x103
taskqueue_thread_loop(c2f525ec,ccc3cd38,c0eaed5c,344,c131b440,...) at taskqueue_thread_loop+0x68
fork_exit(c0a3b180,c2f525ec,ccc3cd38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xccc3cd70, ebp = 0 ---
db>

It is kinda nice though that the pfSense now knows it crashed and asks me if I would like to send the error info to the developers.
[quote]We have detected a crash report. Click here for more information.[/quote]
though the only thing the tab shows on the error report is this
[code]Crash report begins.  Anonymous machine information:

i386
8.1-RELEASE-p2
FreeBSD 8.1-RELEASE-p2 #1: Sun Feb  6 23:47:16 EST 2011     sullrich@FreeBSD_8.0_pfSense_2.0-snaps.pfsense.org:/usr/obj.pfSense/usr/pfSensesrc/src/sys/pfSense_Dev.8

Crash report details:

2048
[/code][/thread]

fasteddy

I don't have access to my pfSense box(s) to get crash info at the moment, but I can say I am in the same boat as LostInConfusion - still getting panics when I try to access a pfSense box through the VPN (though in my case it's IPSec, not OpenVPN). This is using the most recent snapshot. For what it's worth, the previously mentioned carp lock issue probably wasn't at the root of the issue I am having, since I am not using any carp functionality whatsoever with my setup…

jimp

@LostInIgnorance:

It is kinda nice though that the pfSense now knows it crashed and asks me if I would like to send the error info to the developers.

We have detected a crash report. Click here for more information.

though the only thing the tab shows on the error report is this
Crash report begins.  Anonymous machine information:

i386
8.1-RELEASE-p2
FreeBSD 8.1-RELEASE-p2 #1: Sun Feb  6 23:47:16 EST 2011     sullrich@FreeBSD_8.0_pfSense_2.0-snaps.pfsense.org:/usr/obj.pfSense/usr/pfSensesrc/src/sys/pfSense_Dev.8

Crash report details:

2048

That one is a false positive.

The actual report would have done a lot more.

If it stops at a db> prompt, it isn't collecting the crash info automatically for whatever reason.

pwnell

@jimp - any ideas about my crash? I assume it is related to this thread…

fasteddy

I'm in the same situation there as well - my pfSense box stops at the 'db>' prompt after a panic, generating similar information-free reports. Also, in contrast to what I believe other folks have reported, my pfSense box doesn't automatically reboot after a panic, but rather sits happily at the db> prompt, patiently - and indefinitely - awaiting my input. (Which is why I am loathe to do any testing unless I'm within arms reach of the particular box in question!) Is there a setting I've missed somewhere that enables this automatic rebooting, or is my pfSense box just that unhappy?

jimp

pwnell,

I don't know, it looks similar to another panic that was already reported over the weekend. Have you tried a new snapshot?

fasteddy,

What type of install are you on? full/nano? i386 or amd64? How much RAM and swap space?

If you can get a capture of the panic (even a picture of it) and the output of 'bt' at the debug prompt it would help.

fasteddy

I am on a full install, i386, 2GB RAM, 80GB Hard drive, 4GB swap space. The panic information, backtrace info, and general situation remain the same as my original post (on page 15 of this thread). http://forum.pfsense.org/index.php/topic,31721.msg170362.html#msg170362

jimp

@fasteddy:

I am on a full install, i386, 2GB RAM, 80GB Hard drive, 4GB swap space. The panic information, backtrace info, and general situation remain the same as my original post (on page 15 of this thread). http://forum.pfsense.org/index.php/topic,31721.msg170362.html#msg170362

Show me the output of:

sysctl debug.ddb

fasteddy

Here goes:

# sysctl debug.ddb
debug.ddb.capture.data:
debug.ddb.capture.bufsize: 49152
debug.ddb.capture.inprogress: 0
debug.ddb.capture.maxbufsize: 5242880
debug.ddb.capture.bufoff: 0
debug.ddb.scripting.unscript:
debug.ddb.scripting.scripts: lockinfo=show locks; show alllocks; show lockedvnods
kdb.enter.panic=textdump set; capture on; run lockinfo; show pcpu; bt; ps; alltrace; capture off; call doadump; reset
kdb.enter.witness=run lockinfo

debug.ddb.textdump.do_version: 1
debug.ddb.textdump.do_panic: 1
debug.ddb.textdump.do_msgbuf: 1
debug.ddb.textdump.do_ddb: 1
debug.ddb.textdump.do_config: 1
debug.ddb.textdump.pending: 0

jimp

That all looks normal, like it should be doing the textdumps…

What about:

cat /boot/kernel/pfsense_kernel.txt

fasteddy

Doesn't have a whole lot to say:

# cat /boot/kernel/pfsense_kernel.txt
UP
#

jimp

It's enough :-)

That's the uniprocessor kernel. I'm running the SMP kernels. Perhaps that is the difference. Can you switch to an SMP kernel and see if the crashes leave you at the debug prompt still? There are instructions earlier in this thread for switching kernels (also you can edit that text file and change it to SMP instead of UP and the next update will use the SMP kernel instead)

pwnell

Installed the latest one available

2.0-BETA5 (i386)
built on Sun Feb 6 23:54:00 EST 2011

I have a 1 hour 15 minute uptime …. Holding thumbs.

LostInIgnorance

JimP,

Did you need me to do anything while I am here working on other projects? Anything I can do to help debug this?

jimp

No, Ermal is going to be the one having to look into the actual panics.

I was just trying to figure out why some people aren't getting the proper crash dumps like they should.