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From: jack.miller@pioneer-pdt.com (Jack Miller)
To: "Linux-Mips" <linux-mips@linux-mips.org>
Subject: kernel BUG at sched.c:784!
Date: Fri, 18 Jul 2003 09:57:01 -0700
Message-ID: <JCELLCFDJLFKPOBFKGFNGEKJCFAA.jack.miller@pioneer-pdt.com>
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  We are developing a system based around a NEC VR5432 CPU and Broadcom
BCM703X System Controller. When the system is running with the intended
application and drivers we intermittently experience a kernel OOPS in the
scheduler.  Would someone please provide some insight to the following OOPS
?  It appears (with my limited understanding of the scheduler) that the
scheduler is trying to schedule the 'idle' task.  What condition prevails to
cause this to happen ?

  Using a J-TAG Debugger, I "walked" the task list (in both directions) and
everthing appears to be in order.

  Thanks in advance for your help.

  Regards,
    Jack


Linux version 2.4.17 (jack@saturn) (gcc version 3.2.2 20030322 (Pioneer
Voyager)) #1 Fri May 30 14:55:32 PDT 2003
ksymoops 2.4.6 on mips 2.4.17.  Options used
     -v vmlinux (specified)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.17/ (default)
     -m System.map (specified)
     -T 32

root@stb2073:~# kernel BUG at sched.c:784!
Unable to handle kernel paging request at virtual address 00000000, epc ==
8001524c, ra == 8001524c
$0 : 00000000 b001f800 0000001b 00000000 ffffff9d 80008000 0000001f 828f4a20
$8 : 00000001 ffffd890 00001890 801cb119 00000000 00000000 fffffff9 ffffffff
$16: 00000000 00000000 809ae000 828f4a20 80008000 00000000 80008000 1001ccf8
$24: 0000000a 00000002                   809ae000 809afe90 809afe90 8001524c
epc  : 8001524c    Tainted: P
Using defaults from ksymoops -t elf32-tradbigmips -a mips:3000
Status: b001f803
Cause : 8000c40c
Process pvrd (pid: 331, stackpage=809ae000)
Stack: 8016eda8 8016edc0 00000310 fffffc18 00138f80 00000002 809afed8
00000070
       00000000 1001cd00 1001ccfc 809afec8 80014e74 80014e6c 00000400
00000200
       c008422b 80bd4160 00000000 00000000 00138f80 809ae000 80014dd4
2aac2000
       00000000 809aff18 00001807 7edffa50 8002242c 00000070 00000000
8016c290
       00000000 00000000 00000000 00989680 7edffa40 00000000 8000f7c4
8000f7c4
       00000000 ...
Call Trace: [<8016eda8>] [<8016edc0>] [<80014e74>] [<80014e6c>] [<c008422b>]
[<80014dd4>]
 [<8002242c>] [<8016c290>] [<8000f7c4>] [<8000f7c4>]
Code: 24a5edc0  0c0062f7  24060310 <08005485> ae200000  40016000  00000000
3421001f  3821001e


>>RA;  8001524c <schedule+33c/47c>
>>$1; b001f800 <_end+2fe2aea0/3fe2a6a0>
>>$5; 80008000 <init_task_union+0/0>
>>$7; 828f4a20 <_end+27000c0/3fe2a6a0>
>>$11; 801cb119 <printk_buf.4+19/400>
>>$18; 809ae000 <_end+7b96a0/3fe2a6a0>
>>$19; 828f4a20 <_end+27000c0/3fe2a6a0>
>>$20; 80008000 <init_task_union+0/0>
>>$22; 80008000 <init_task_union+0/0>
>>$23; 1001ccf8 <_binary_ramdisk_gz_size+1001a6da/7fffe9e2>
>>$28; 809ae000 <_end+7b96a0/3fe2a6a0>
>>$29; 809afe90 <_end+7bb530/3fe2a6a0>
>>$30; 809afe90 <_end+7bb530/3fe2a6a0>
>>$31; 8001524c <schedule+33c/47c>

>>PC;  8001524c <schedule+33c/47c>   <=====

Trace; 8016eda8 <mips_io_port_base+d08/1c30>
Trace; 8016edc0 <mips_io_port_base+d20/1c30>
Trace; 80014e74 <schedule_timeout+74/e4>
Trace; 80014e6c <schedule_timeout+6c/e4>
Trace; c008422b <[bcm7030]scard_interrupt+f/340>
Trace; 80014dd4 <process_timeout+0/2c>
Trace; 8002242c <sys_nanosleep+170/1fc>
Trace; 8016c290 <mips_hwi4_dispatch+70/78>
Trace; 8000f7c4 <stack_done+1c/38>
Trace; 8000f7c4 <stack_done+1c/38>

Code;  80015240 <schedule+330/47c>
00000000 <_PC>:
Code;  80015240 <schedule+330/47c>
   0:   24a5edc0  addiu   a1,a1,-4672
Code;  80015244 <schedule+334/47c>
   4:   0c0062f7  jal     18bdc <_PC+0x18bdc> 8002de1c
<generic_file_direct_IO+294/2d8>
Code;  80015248 <schedule+338/47c>
   8:   24060310  li      a2,784
Code;  8001524c <schedule+33c/47c>   <=====
   c:   08005485  j       15214 <_PC+0x15214> 8002a454 <__vma_link+9c/e0>
<=====
Code;  80015250 <schedule+340/47c>
  10:   ae200000  sw      zero,0(s1)
Code;  80015254 <schedule+344/47c>
  14:   40016000  mfc0    at,$12
Code;  80015258 <schedule+348/47c>
  18:   00000000  nop
Code;  8001525c <schedule+34c/47c>
  1c:   3421001f  ori     at,at,0x1f
Code;  80015260 <schedule+350/47c>
  20:   3821001e  xori    at,at,0x1e


Jack Miller <jack.miller@pioneer-pdt.com>
Pioneer Digital Technologies, Inc.
6170 Cornerstone Court East
Suite 330
San Diego, CA 92121-3767
vox: (858)824-0790 x356
fax: (858)824-0796