[Bug 227116] CURRENT doesn't boot with integer divide fault in uma_startup_count

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227116

--- Comment #18 from Daniel Kolesa <daniel at octaforge.org> ---
Created attachment 192014
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192014&action=edit
patched kernel

I built the kernel on my server and replaced it in the installer image, but it
still fails at the same place. Backtrace photo in attachment, kgdb here:

(kgdb) list *uma_startup_count+0xd6
0xffffffff80e3e7b6 is in uma_startup_count (/usr/src/sys/vm/uma_core.c:1827).
1822            /* Memory for the rest of startup zones, UMA and VM, ... */
1823            if (roundup2(zsize, UMA_BOOT_ALIGN) > UMA_SLAB_SIZE)
1824                    pages += (zones + vm_zones) *
1825                        howmany(roundup2(zsize, UMA_BOOT_ALIGN),
UMA_SLAB_SIZE);
1826            else
1827                    pages += howmany(zones,
1828                        UMA_SLAB_SPACE / roundup2(zsize, UMA_BOOT_ALIGN));
1829    
1830            /* ... and their kegs. Note that zone of zones allocates a keg!
*/
1831            pages += howmany(zones + 1,

As you can see from the source, it still fails in the very same place, and you
can also see how I patched it. You can also see from the uname in the photo
that it is indeed the patched kernel.

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