On August 5, 2015 12:20:15 PM HST, Kevin O wrote: >On Wed, Aug 5, 2015 at 1:15 PM, Chris H wrote: > >> On Wed, 05 Aug 2015 09:30:28 -1000 parv >wrote >> >> > On August 5, 2015 4:10:14 AM HST, Ian L >> > wrote: >> > >On Tue, 2015-08-04 at 23:54 -1000, parv wrote: >> > >> Please CC me as I cannot properly use my laptop, Thinkpad X200 >> > >> (i386). >> > >> >> > >> 8-stable has been crashing a lot since source update of Jul >2015[0]. >> > >> After building debug kernel, kgdb shows lock reversal order & in >> > >> ufsdirhash. File systems (/, var, misc) are all UFS, with var & misc >> > >> having soft updates enabled. ... >> > >> Most recent crash ... >> > >> >> > >> http://imagebin.ca/v/2B50NARvIHsH ... >> > >When you say you built a debug kernel, does that include option >> > >WITNESS_KDB? If so, remove that so you can find the real error. LORs >> > >related to ufs_dirhash have been reported for years, and nobody with >> > >the >> > >appropriate skills seems to be interested in fixing them; they just get >> > >declared to be harmless. ... >> > I will try that as soon as I can. Currently after every little fs >> > operation, >> > I am thrown in debugger-reboot-fsck cycle. As such I cannot do anything. ... >> > I tried booting >> > /boot/kernel.old/kernel from boot prompt but that presented debugger soon >> > after boot. >> > >> > BTW is it possible to set kernel.old to boot next time at boot prompt? ... >> It might be somewhat easier to boot from the boot-only/install >> CD/DVD, and then choose rescue mode. >> After you've gotten there. Simply mount "/" in read/write, them open >> it's /boot/loader.conf, and add the following: >> kernel="kernel.old" >> boot_single="YES" >> >> and save it. You can then remove the CD/DVD, and reboot which will >land >> you in single-user mode, from your kernel.old/kernel. >> Assuming it booted to that kernel OK, you can run fsck -f ...
Chris, after spending my mail I was thinking on the same lines. But I delayed due to laziness, till ... >You're working too hard. > >You can drop into the loader prompt and enter "boot kernel.old". This >will >reload both the kernel and modules from /boot/kernel.old. Thanks Kevin. It was the loader prompt, not the boot prompt, that I should have tried. After booting old kernel from loader prompt, functionality was restored (to some workable state). > Also handy and >virtually unknown is that you can build test kernels and not blow away >the >old, working kernel by using "make reinstallkernel" instead of >installkernel. This will keep the existing kernel.old and just replace >the >currently running kernel. Thanks again. >N.B. There is a bug that will cause a failure to re-install >PORTS_MODULES. ... At this point I am not worried about kernel modules built from ports. I just want a working version that won't seemingly randomly crash, leaving no core dump or any other relevant messages. The only thing pointing to a crash are entries in wtmp, which lastlog reports as "crash". Nothing. Else. -- _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
