i386/179112: 9.1 installer panics with a kmem_malloc() failure on i386 embedded systems

[Majdi S. Abbas]

>Number:         179112
>Category:       i386
>Synopsis:       9.1 installer panics with a kmem_malloc() failure on i386 embedded systems
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu May 30 16:10:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Majdi S. Abbas
>Release:        9.1-RELEASE
>Organization:
Lattice, L.L.C.
>Environment:
9.1 GENERIC/i386 as bundled in the USB installer
>Description:
The 9.1 installer panics when kmem_malloc() fails on smaller embedded i386 architecture systems due to an autoscaling problem and CTL.  This is 100% reproducible until certain parameters are set via the loader during install:

 FreeBSD Installer
 ÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒ


                ÏÒÒÒÒÒÒÒÒÒÒÒÒArchive ExtractionÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÎ
                ¯                                             ¯
                ¯ base.txz                     [    57%     ] ¯
                ¯ kernel.txz                   [  Pending   ]panic: kmem_malloc(
4096): kmem_map too small: 38060032 total allocated           ¯
cpuid = 0       ¯ Extracting distribution files...            ¯
KDB: stack backtrace:                                         ¯
#0 0xc0af3aff at kdb_backtrace+0x4fssÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÎ  ¯
#1 0xc0ac052f at panic+0x16f          53%                  ¯  ¯
#2 0xc0d2caea at kmem_malloc+0x28aÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÍ  ¯
#3 0xc0d202b7 at page_alloc+0x27ÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÒÍ
#4 0xc0d22bca at keg_alloc_slab+0x10a
#5 0xc0d23164 at keg_fetch_slab+0xd4
#6 0xc0d234ec at zone_fetch_slab+0x4c
#7 0xc0d24ade at uma_zalloc_arg+0x4ae
#8 0xc0aab29a at malloc+0x5a
#9 0xc0ce922a at newjsegdep+0x2a
#10 0xc0cf5a89 at newjaddref+0x69
#11 0xc0cf5b16 at softdep_setup_inomapdep+0x56
#12 0xc0cd9398 at ffs_nodealloccg+0x728
#13 0xc0cd3d91 at ffs_hashalloc+0x41
#14 0xc0cd8913 at ffs_valloc+0x4a3
#15 0xc0d15c14 at ufs_makeinode+0xa4
#16 0xc0d164a0 at ufs_create+0x30
#17 0xc0e48412 at VOP_CREATE_APV+0x42
Uptime: 8m5s
Automatic reboot in 15 seconds - press a key on the console to abort
--> Press a key on the console to reboot,
--> or switch off the system now.
>How-To-Repeat:
- Install FreeBSD 9.1/i386 from the USB installer image onto any i386 system with less than about 256 or 384M of DRAM.

>Fix:
Set these parameters via the loader before booting the install image, and the install succeeds:

kern.cam.ctl.disable=1
vm.kmem_size_scale=1

Neither parameter, by itself, is enough for the install to complete, both are required.  Autoscaling appears to fail on smaller platforms.

>Release-Note:
>Audit-Trail:
>Unformatted: