kern/84656: kernel panic when kern.maxdsiz is => hw.physmem

Hans Meyer asstech at
Sun Aug 7 21:50:11 GMT 2005

>Number:         84656
>Category:       kern
>Synopsis:       kernel panic when kern.maxdsiz is => hw.physmem
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Aug 07 21:50:09 GMT 2005
>Originator:     Hans Meyer
>Release:        5.4R - 5.3R 4.11R
FreeBSD 5.4-RELEASE FreeBSD 5.4-RELEASE #5: Fri Aug  5 11:42:14 BRST 2005    hmm at  i386
I saw the other PRs

when setting kern.maxdsiz in /boot/loader.conf to a higher value than hw.physmem a kernel panic right after the kernel load when real memory and available memory should appear.

this appearently is hardware related because it happens on Sempron and other P4/Asus motherboards but not on AMD XP/Asus MBs. Memory amount does not matter, I get it on 1 to 4GB RAM. On AMD the higher value is accepted and the machine runs fine even when swapping after.

Compiling MAXDSIZ or setting in loader.conf makes no diference as well as acpi enable or not

The panic messages are cannot allocate virtual memory

there is no core 

remove /boot/loder.conf

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