page fault kernel panics after 2.5.2 upgrade

doubledgedboard

Well I haven't had any more crashes for the past few days...

What did I do?

Unplugged the keyboard/mouse and monitor cable. I suspect one of those peripherals was leading to an occasional hiccup. I don't have a KVM so I have a single KB/Mouse for two server machines, and usually I'm manually swapping them around on occasion.

My theory is that I was usually leaving it connected to the other server, but changed and left it connected to the router server, and perhaps this was leading to crashes over time due to instability with the peripherals or the video driver.

Anyway, hopefully I don't post in this again which means that was the problem and I solved it, otherwise I'll post back again if it wasn't

stephenw10

Hmm, well that would be odd but one of those troubleshooting cases where the cause comes from some seemingly unrelated thing. Leaky microwave, vacuum cleaner in the UPS etc.

doubledgedboard

@stephenw10

Whelp it crashed again, I guess it was wishful thinking after all. I got lucky with a few days without crashes

stephenw10

Same backtrace?

doubledgedboard

@stephenw10 Yeah probably, attached

db:0:kdb.enter.default>  bt
Tracing pid 63867 tid 100290 td 0xfffff8009646f740
kdb_enter() at kdb_enter+0x37/frame 0xfffffe009e822980
vpanic() at vpanic+0x197/frame 0xfffffe009e8229d0
panic() at panic+0x43/frame 0xfffffe009e822a30
trap_fatal() at trap_fatal+0x391/frame 0xfffffe009e822a90
trap_pfault() at trap_pfault+0x4f/frame 0xfffffe009e822ae0
trap() at trap+0x410/frame 0xfffffe009e822bf0
calltrap() at calltrap+0x8/frame 0xfffffe009e822bf0
--- trap 0xc, rip = 0x8002867c0, rsp = 0x7fffffffe9a0, rbp = 0x7fffffffe9a0 ---

textdump.4.tar

stephenw10

Mmm, still nothing leading up to the trap and nothing show on the console.
Hard to say what that might be with nothing to go on really.

doubledgedboard

I may have solved the issue, although I'm probably tempting fate by claiming it so soon.

The issue persisted for some time, at first it was very periodic, approximately three days between panics, which is why I wasn't completely sold on a hardware problem yet.

I tried seeing if restarting "ahead of schedule" would give me three extra days (from last normal restart), but it still panic'd only a day later.

Eventually it naturally restarted sooner than three days.

Last night it started restarting every few minutes, and then suddenly it was restarting before it could even finish booting.

Aha!

Classic symptoms of a power supply issue...

I replaced the PSU (circa 2004) and it's been online ever since. I'll check back in a week and if it still hasn't panicked then I'll call that the issue.

doubledgedboard

I just can't win...

It rebooted last night. It wasn't the power supply.

doubledgedboard

I'm about to hit 7 days uptime so I think I finally found the issue.

I started pulling memory sticks out one by one and waiting for it to restart.

I suspect I have at least one bad stick of ram.

Posting this for posterity for anyone else who runs into this type of issue.

MrPete

@doubledgedboard For future browsers: it's always a good idea to do an intense RAM test.

FWIW, the folks at memtest86 dot com have recently done massive updates / upgrades to the (free) RAM tester.

I recently had a situation where RAM passed a few-years-old version of memtest... but with the latest version, it immediately was detected as bad.

I strongly encourage everybody to grab a current version :)

doubledgedboard

@mrpete Oh for sure, I've been using memtest and variants for years

the issue here is that the system required near 24/7 uptime and I didn't have the time to take it down to run 8+ hour long memory tests, so I had to do what I could while maintaining uptime

(and for posterity, I'm back up to 88 days of uptime now )

Schoolofhardknocks

I had something similar that happened to me and it happened during the boot sequence, so I had to reinstall pfsense altogether because I couldn't finish booting or restore a recent configuration, but the dump was more...

Tracing pid 431 tid 100111 td 0xfffff800055f2000
kdb_enter() at kdb_enter+0x37/frame 0xfffffe00005a4620
vpanic() at vpanic+0x197/frame 0xfffffe00005a4670
panic() at panic+0x43/frame 0xfffffe00005a46d0
ffs_valloc() at ffs_valloc+0x8f3/frame 0xfffffe00005a4760
ufs_makeinode() at ufs_makeinode+0xa3/frame 0xfffffe00005a48f0
ufs_create() at ufs_create+0x34/frame 0xfffffe00005a4910
VOP_CREATE_APV() at VOP_CREATE_APV+0x75/frame 0xfffffe00005a4940
vn_open_cred() at vn_open_cred+0x2d9/frame 0xfffffe00005a4a90
kern_openat() at kern_openat+0x213/frame 0xfffffe00005a4c00
amd64_syscall() at amd64_syscall+0x387/frame 0xfffffe00005a4d30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe00005a4d30
--- syscall (5, FreeBSD ELF64, sys_open), rip = 0x800b34e0a, rsp = 0x7fffffffd168, rbp = 0x7fffffffd1a0 ---

Then it proceeded with...

Tracing command sleep pid 96166 tid 100128 td 0xfffff800056c7740
sched_switch() at sched_switch+0x630/frame 0xfffffe00005f9a00
mi_switch() at mi_switch+0xd4/frame 0xfffffe00005f9a30
sleepq_catch_signals() at sleepq_catch_signals+0x403/frame 0xfffffe00005f9a80
sleepq_timedwait_sig() at sleepq_timedwait_sig+0x14/frame 0xfffffe00005f9ac0
_sleep() at _sleep+0x1b3/frame 0xfffffe00005f9b40
kern_clock_nanosleep() at kern_clock_nanosleep+0x1d2/frame 0xfffffe00005f9bc0
sys_nanosleep() at sys_nanosleep+0x3b/frame 0xfffffe00005f9c00
amd64_syscall() at amd64_syscall+0x387/frame 0xfffffe00005f9d30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe00005f9d30
--- syscall (240, FreeBSD ELF64, sys_nanosleep), rip = 0x80038b6aa, rsp = 0x7fffffffec18, rbp = 0x7fffffffec60 ---

It repeated these same sleep system calls for a long time and then forced a reboot.
After reinstalling everything the crash was occurring within the pfSense webConfigurator. Its still happening, not sure why, but its not rebooting my box anymore..at least.

Schoolofhardknocks

@schoolofhardknocks

I also did some testing and when I reroot the device from WebConfigurator, it triggers the same crash dump. I see it launching on my COM.

stephenw10

@schoolofhardknocks said in page fault kernel panics after 2.5.2 upgrade:

panic() at panic+0x43/frame 0xfffffe00005a46d0
ffs_valloc() at ffs_valloc+0x8f3/frame 0xfffffe00005a4760
ufs_makeinode() at ufs_makeinode+0xa3/frame 0xfffffe00005a48f0
ufs_create() at ufs_create+0x34/frame 0xfffffe00005a4910

That's a filesystem error in UFS. You can probably recover by running a filesystem check:
https://docs.netgate.com/pfsense/en/latest/troubleshooting/filesystem-check.html#manual-filesystem-check

Steve

MrPete

@stephenw10 @Schoolofhardknocks fsck is great for some filesystems... but if you have ZFS, a different set of tools is used. (Or, am I being dumb, and the fact that it is a UFS panic proves fsck is needed? ;) )

Expanding on the ZFS note on the linked page:

An advantage of ZFS: you can do the equivalent of fsck while up and running!

I do:

zpool status (shows name of your pool(s), any past errors, and current scrub status)
(assuming no HW error - use smartctl -x <device> to check the raw drives!***
zpool scrub <poolname> to do a live scrub
zpool clear to clear old errors (again, assuming it is not a HW error!)

*** The documentation describes SMART tools... not clear to me if the most extensive info is made available in the gui. smartctl -x shows quite a bit more... was added to the smart system a few years ago.

stephenw10

@mrpete said in page fault kernel panics after 2.5.2 upgrade:

the fact that it is a UFS panic proves fsck is needed?

Yes, that. You would not see that panic if ZFS was used.

Steve