DragonFlyBSD

System panics under following conditions:

1. sysctl dsched
   dsched.policies: noop fq
   dsched.debug: 0
   dsched.policy.default: fq
   dsched.policy.md0: noop
   dsched.policy.acd0: noop
   dsched.policy.10092514011426: noop
   dsched.policy.da0: fq
   dsched.policy.da1: fq
   dsched.policy._____WD-WCAT1H582396: fq
   dsched.policy.cd0: noop
   dsched.policy._____WD-WCAT1H604215: fq
   dsched.fq.version: 1.1

1. cat ioprio_test.sh
   #!/bin/sh
   rm -f ioprio1 ioprio9 data_file1 data_file9
   dd if=/dev/random bs=1m count=1000 of=data_file1
   dd if=/dev/random bs=1m count=1000 of=data_file9
   time sh -c 'ioprio -n 1 dd if=data_file1 bs=1m count=1000 of=ioprio1; sync; echo ioprio1 done' &
   time sh -c 'ioprio -n 9 dd if=data_file9 bs=1m count=1000 of=ioprio9; sync; echo ioprio9 done' &

1. ./ioprio_test.sh

(panics here)

Issue is reproducible. Using unmodified 3.6-RELEASE with HAMMER FS. Hardware is Dell PowerEdge R415 with LSI (mpt0) RAID card.

1. uname -a
   DragonFly NNINPABE1NB02 3.6-RELEASE DragonFly v3.6.0-RELEASE #8: Fri Nov 22 13:22:00 PST 2013 root@pkgbox64.dragonflybsd.org:/usr/obj/build/home/justin/src/sys/X86_64_GENERIC x86_64

core.txt.0 and info.0 attached. vmcore.0 can be uploaded upon request.