[Bug 259218] Fatal trap 12: page fault while in kernel mode

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259218

--- Comment #19 from Dennis Clarke <dclarke@blastwave.org> ---

Follow up. The little VIA Eden Esther 7F4K1G2E-LF board is running fine
for a week now.  At the very least it is walking briskly. Managed to
perform a buildworld and buildkernel. The buildworld required a bit more
than 7 days and 8 hours :


esther# /usr/bin/time -p /usr/bin/nice -n +18 make buildworld
.
.
.
cc -target i386-unknown-freebsd14.0 --sysroot=/usr/obj/usr/src/i386.i386/tmp
-B/usr/obj/usr/src/i386.i386/tmp/usr/bin -O2 -pipe -fno-common -g -gz=zlib
-std=gnu99 -Wno-format-zero-length -fstack-protector-strong -Wsystem-headers
-Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings
-Wswitch -Wshadow -Wunused-parameter -Wcast-align -Wchar-subscripts
-Wnested-externs -Wredundant-decls -Wold-style-definition -Wno-pointer-sign
-Wmissing-variable-declarations -Wthread-safety -Wno-empty-body
-Wno-string-plus-int -Wno-unused-const-variable -Qunused-arguments   -o
shared_shadow_inval_test.full shared_shadow_inval_test.o  -lprivateatf-c
objcopy --only-keep-debug shared_shadow_inval_test.full
shared_shadow_inval_test.debug
objcopy --strip-debug --add-gnu-debuglink=shared_shadow_inval_test.debug 
shared_shadow_inval_test.full shared_shadow_inval_test
===> tests/sys/vmm (all)
echo '#! /usr/libexec/atf-sh' > vmm_cred_jail.tmp
cat /usr/src/tests/sys/vmm/vmm_cred_jail.sh >>vmm_cred_jail.tmp
chmod +x vmm_cred_jail.tmp
mv vmm_cred_jail.tmp vmm_cred_jail
===> etc (all)
===> etc/sendmail (all)
rm -f freebsd.cf
m4 -D_CF_DIR_=/usr/src/contrib/sendmail/cf/ -D_NO_MAKEINFO_   
/usr/src/contrib/sendmail/cf/m4/cf.m4 /usr/src/etc/sendmail/freebsd.mc >
freebsd.cf
chmod 444 freebsd.cf
rm -f freebsd.submit.cf
m4 -D_CF_DIR_=/usr/src/contrib/sendmail/cf/ -D_NO_MAKEINFO_   
/usr/src/contrib/sendmail/cf/m4/cf.m4 /usr/src/etc/sendmail/freebsd.submit.mc >
freebsd.submit.cf
chmod 444 freebsd.submit.cf
    83844.82 real     75910.18 user      5317.98 sys

--------------------------------------------------------------
>>> World build completed on Fri Oct 29 09:14:59 GMT 2021
>>> World built in 634489 seconds, ncpu: 1
--------------------------------------------------------------
real 634499.23
user 599593.08
sys 21475.68
You have new mail.
esther# 


At times it seems to get "stuck" while doing installworld and hitting
the SIGINFO ( CTRL - T ) on the console would report : 

    load: 11.40  cmd: install 14225 [runnable] 2562.09r 0.00u 0.25s 0% 
    1368k mi_switch+0x1ca critical_exit_preempt+0x5d  
    __stop_set_sysinit_set+0xe3c01df7 ll+0x7

Then it would seem to gather its wits and resume. 

esther# uname -apKU 
FreeBSD esther 14.0-CURRENT FreeBSD 14.0-CURRENT #2
main-n250207-3b5331dd8d4-dirty: Fri Oct 29 16:54:01 GMT 2021    
root@esther:/usr/obj/usr/src/i386.i386/sys/GENERIC  i386 i386 1400039 1400039
esther#

Seems perfectly stable and slow.

-- 
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
GreyBeard and suspenders optional

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