panic: kmem_malloc(131072): kmem_map too small (AMD64)

[Chuck Swiger]

On Sep 26, 2007, at 11:00 PM, Dag-Erling Smørgrav wrote:
> Chuck Swiger <cswiger at mac.com> writes:
>> I'm not certain whether FreeBSD's kernel memory allocator [malloc(9),
>> zone(9)] even supports the notion of allocating pageable memory
>> rather than memory taken from the fixed KVA region.  The manpage
>> implies that calling kernel malloc with M_WAITOK will always return a
>> valid pointer and not NULL, but I'm not convinced this is will be
>> true if you try allocating something larger than the size of KVA and/
>> or the amount of physical RAM available in the system.
>
> malloc(M_WAITOK) will panic if the request is not satisfiable.   
> Where do
> you think "kmem_map too small" comes from?

Indeed-- an excellent point that would be nifty to find in the docs:

--- src/share/man/man9/malloc.9~   2005-02-22 12:20:20.000000000 -0500
+++ src/share/man/man9/malloc.9    2007-09-27 13:00:36.000000000 -0400
@@ -289,7 +289,9 @@
.Dv NULL
if the request could not be satisfied (implying that
.Dv M_NOWAIT
-was set).
+was set).  However, if
+.Dv M_WAITOK
+is set and the request could not be satisfied, the kernel will panic.
.Sh DIAGNOSTICS
A kernel compiled with the
.Dv INVARIANTS

...?

-- 
-Chuck