This e-mail was previously posted on freebsd-stable.
I recently received a panic in vm_page_remove() which got me looking for similar panics in the past for other people. From this search, I came across a change that was made to fix a similar problem and was quickly reverted afterwards.
My system experienced panics in the past, but I may or may not have fixed it. More recently my system has been freezing providing no clue for the reason. Fortunately, I was on the console when it died as opposed to within X, although X was running with some applications. I believe this allowed the kernel to at least fall into DDB.
Fix: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/i386/pmap.c.diff?r1=1.250.2.19&r2=1.250.2.20&only_with_tag=RELENG_4&f=h
Regression?: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/i386/pmap.c.diff?r1=1.250.2.20&r2=1.250.2.21&only_with_tag=RELENG_4&f=h
Mention of patch to remove the change: http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&selm=bilo8r%241vbn%241%40FreeBSD.csie.NCTU.edu.tw&rnum=14
Panic (function trace) as scribbled from DDB: vm_page_remove vm_page_free_toq vm_page_alloc vm_hold_load_pages allocbuf geteblk bwrite vop_stdbwrite vop_defaultop spec_vnoperate ufs_vnoperatespec bawrite softdep_fsync_mountdev ffs_fsync sched_sync fork_trampoline
Uname: FreeBSD thor.farley.org 4.10-STABLE FreeBSD 4.10-STABLE #2: Tue Aug 3 17:37:38 CDT 2004 [EMAIL PROTECTED]:/usr/obj/usr/src/sys/THOR i386
Kernel message some time (longer than several minutes but unknown): Aug 21 18:46:36 thor /kernel: handle_workitem_freeblocks: block count
While RELENG_4 and RELENG_5 are fairly close in that section of code, RELENG_5 has the assignment of pte within the for-loop, uses pmap_pte_quick() instead of pmap_pte() and performs a slightly different check against pte.
memtest86 has been run on this system for longer than a day without any problems.
Does anyone know if it was reverted back on purpose? Should it be more similar to RELENG_5. I am fairly good at C; I just do not know the kernel all that well. :)
Sean ----------------------- [EMAIL PROTECTED] _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
