renice with negative value

[GoogleCodeExporter]

What steps will reproduce the problem?
1.r9623, nonvga_debug/x86
2.abnormal behavior:
Starting shell [tish] at device [uart]
root@embox:/#renice 1 0
root@embox:/#top
PID USER  PR COMMAND
0   0      1 kernel
1   0      1 top
root@embox:/#renice 0 0

(WAITING)
----------------------------
or so:
Starting shell [tish] at device [uart]
root@embox:/#
root@embox:/#
root@embox:/#renice 1 0
root@embox:/#renice 1 0

ASSERTION FAILED at src/kernel/task/multi.c : 203,
    in function task_exit:

critical_allows(CRITICAL_SCHED_LOCK)
kernel debug panic

Backtrace:

     sp        pc         func + offset
     --------  --------  --------------------------
  8  00697ec8  001a110d  <__assertion_handle_failure+0x73>
  7  00697f08  001411ab  <task_exit+0x3c>
  6  00697f58  00141351  <task_set_priority+0x0>
  5  00697f88  00110344  <thread_trampoline+0x85>
  4  00697fb8  00000000
  3  00697ea8  00000085
  2  00000085  53f000ff  <sqrtl+0x53d51f7a>

QEMU: Terminated

Original issue reported on code.google.com by ki.stfu on 20 Apr 2013 at 1:50

[GoogleCodeExporter]

second bug fixed by r9624

Original comment by ki.stfu on 20 Apr 2013 at 2:01

[GoogleCodeExporter]

fixed by r9630

Original comment by ki.stfu on 20 Apr 2013 at 3:23

• Changed state: Fixed