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Re: kern/45369: reproducable crash when running out of disk space

The following reply was made to PR kern/45369; it has been noted by GNATS.

From: Martin Husemann <>
Subject: Re: kern/45369: reproducable crash when running out of disk space
Date: Sat, 17 Sep 2011 10:12:37 +0200

 Here is a how to repeat it manually, without qemu. For easy of example
 I assume you have run the mentioned anita command already, so all files
 are in place (if not: workdir/download contains an amd64/ directory which
 then contains the binary and the installation directory ...)
 # create an empty test directory
 mkdir /tmp/test
 # create empty (and too small) disk image file
 dd if=/dev/zero bs=1m count=512 of=/tmp/test/wd0.img
 # create CD image for install sets
 makefs -t cd9660 -o rockridge /tmp/test/inst.iso workdir/download
 # invoke qemu with boot floppy
 qemu-system-x86_64 -nographic -m 256M -cdrom /tmp/test/inst.iso -drive 
file=/tmp/test/wd0.img,if=ide,index=0,media=disk -fda 
 # wait for disk change prompt, then use Ctrl-A c to switch from console to
 # monitor and enter:
 change floppy0 workdir/download/amd64/installation/floppy/boot2.fs
 # verify the result:
 info block
 # return to console by another Ctrl-A c
 # press enter, watch spinning...
 # repeat for other floppies
 # ...
 # now sysinst shows up, ack "English" and "unchanged"
 # select "Install"
 # select "Yes"
 # Hit enter to continue
 # Custom installation
 # select the following sets:
 # kernel (GENERIC), modules, base, system, compiler tools,
 # miscellaneous, test programs.
 # install sets
 # ack geometry
 # use entire disk
 # install bootcode
 # set size of partitions
 # accept suggested defaults
 # ack partitions
 # ack disk name
 # select Yes to continue
 # use serial port com 0 for bootblocks
 # use CDROM
 voila: crash happens when disk image fills up. Unfortunately the install
 kernel on the boot floppies is stripped:
 kernel diagnostic assertion "!pmap_extract(pmap_kernel(), va + 
UBC_UMAP_ADDR(umap), NULL)" failed: file 
"/home/builds/ab/HEAD/src/sys/uvm/uvm_bio.c", line 800
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 rip ffffffff80251e55 cs 8 rflags 246 cr2  ffff800012944000 
cpl 0 rsp ffff800013254980
 Stopped in pid 3023.1 (tar) at  ffffffff80251e55:       leave
 db{0}> bt
 ?() at ffffffff80251e55
 ?() at ffffffff806a1263
 ?() at ffffffff80803599
 ?() at ffffffff8076f2ac
 ?() at ffffffff8077e928
 ?() at ffffffff8079d273
 ?() at ffffffff8079e0b6
 ?() at ffffffff80721526
 ?() at ffffffff807b0371
 ?() at ffffffff8079a3af
 ?() at ffffffff806ba62c
 but it should be easy to modify the above procedure by using the bootable CD
 image instead, key point only is the too small target disk image.

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