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kmem_malloc crash with 4.8

Lamont Lucas <lamont_(_at_)_cluepon_(_dot_)_com> writes:

> Hi.  I've recently borrowed a SuperMicro 6013P-8 from a vendor
> for the purposes of testing it to see if FreeBSD and these machines will
> make a good replacements for our current flock of 11 Netra T1s running
> solaris.  Things are going very well with the tests, with the glaring
> exception of the following crash:
> While doing some significant disk operations: du, deleting a different
> part of the tree and finally running "sync" the machine locked hard
> with the following errors:
> panic: kmem_malloc(4096): kmem_map too small: 230162432 total allocated
> mp_lock = 03000001; cpuid = 3; lapic.id = 07000000
> boot() called on cpu#3
> Then "Synching disks" but no futher output is printed, nor is any
> further progress made.
> This machine was installed off of 4.8-release and was rebuilt under
> -stable as of april 4th, late in the afternoon.  The kernel conf file
> is attached, but biggest changes I made were to enable SMP as well as 
> hyperthreading.  It has 2 gigs of ram and 2 2.4 ghz xeon processors
> capable of hyperthreading.  The drive is a single <SEAGATE ST336753LC 0003>
> controlled by a AIC7902 Ultra 320 scsi adapter.
> I saw the previous discussion about the adaptec U320 controllers and
> scott long's advice about "lower[ing] the tag depth to 32" using
> camcontrol tags.  I'm currently planning on removing hyperthread
> support and rerunning some of my tests to see if I can reproduce the
> error.  I'm also going to try some bonnie tests.  If I can 
> consistantly reproduce the error I'll report back, but I'd appreciate
> knowing what additional debug info I can give back.  I'm not clear
> what would cause this type of error.
> Attached are dmesg as well as the kernel config file.
> Can anybody recommend any other steps to try and eliminate or fix
> this problem?

You might want to reduce the maxusers value...