Hi,

 I am getting a reproducable Oops+Aiee when trying to mount a ATAPI 
CDROM via the ide-scsi interface under 2.4.20-pre5-ac4. Works OK 
without ide-scsi.

First the Oops from mount:

knobi:/tmp # ksymoops -m /System.map < warn
ksymoops 2.4.3 on i686 2.4.20-pre5-ac4.  Options used
     -V (default)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.20-pre5-ac4/ (default)
     -m /System.map (specified)

Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_register not 
found in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_restore not 
found in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_set not found 
in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_setmax not 
found in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_unregister not 
found in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_idle_cpu not found in 
System.map.  Ignoring ksyms_base entry
kernel BUG at 
/scratch/linux-kernel/linux-2.4.20-pre5-ac4/include/linux/blkdev.h:153!
invalid operand: 0000
CPU:    0
EIP:    0010:[ide_build_sglist+77/396]    Not tainted
EFLAGS: 00010206
eax: 0000005a   ebx: c16cf000   ecx: c03636f4   edx: db657f60
esi: 00000000   edi: db657f60   ebp: d7d31d18   esp: d7d31cf8
ds: 0018   es: 0018   ss: 0018
Process mount (pid: 1307, stackpage=d7d31000)
Stack: c16cf000 c03637a4 db657f60 db657f60 00000003 00000297 dbc85e34 
c16cc000
       d7d31d44 c02009da c03636f4 db657f60 c03636f4 c03637a4 db657f60 
df48a06c
       00000000 00000000 c03636f4 d7d31d64 c0200e92 c03637a4 db657f60 
c03637a4
Call Trace:    [ide_build_dmatable+86/396] [__ide_dma_read+42/284] 
[yenta_socket:__insmod_yenta_socket_O/lib/modules/2.4.20-pre5-ac4/kernel/+-325121/96] 
[yenta_socket:__insmod_yenta_socket_O/lib/modules/2.4.20-pre5-ac4/kernel/+-324740/96] 
[start_request+370/460]
Code: 0f 0b 99 00 80 64 2b c0 8b 45 08 c7 80 24 04 00 00 01 00 00
Using defaults from ksymoops -t elf32-i386 -a i386

Code;  00000000 Before first symbol
00000000 <_EIP>:
Code;  00000000 Before first symbol
   0:   0f 0b                     ud2a
Code;  00000002 Before first symbol
   2:   99                        cltd
Code;  00000002 Before first symbol
   3:   00 80 64 2b c0 8b         add    %al,0x8bc02b64(%eax)
Code;  00000008 Before first symbol
   9:   45                        inc    %ebp
Code;  0000000a Before first symbol
   a:   08 c7                     or     %al,%bh
Code;  0000000c Before first symbol
   c:   80 24 04 00               andb   $0x0,(%esp,%eax,1)
Code;  00000010 Before first symbol
  10:   00 01                     add    %al,(%ecx)


6 warnings issued.  Results may not be reliable.

 After a few 10 seconds I get scsi reset messages and then the Aiee:

knobi:/tmp # ksymoops -m /System.map < aiee
ksymoops 2.4.3 on i686 2.4.20-pre5-ac4.  Options used
     -V (default)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.20-pre5-ac4/ (default)
     -m /System.map (specified)

Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_register not 
found in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_restore not 
found in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_set not found 
in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_setmax not 
found in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_cpufreq_unregister not 
found in System.map.  Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol GPLONLY_idle_cpu not found in 
System.map.  Ignoring ksyms_base entry
Oops: 0000
CPU: 0
EIP: 0010:[<c011554a>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010002
eax: c167efa0 ebx: d7d31f2c ecx: 00000000 edx: 00000000
esi: 00000000 edi: 00000286 ebp: c031ddec esp: c031ddd8
ds: 0018 es: 0018 ss: 0018
Process swapper (pid:0, stackpage=c031d000)
Stack: c1515eec c167efa0 c02e037c 00000003 c167efa0 c031de00 c0128337 
d7d35200
       00000202 c1515eec c031de14 c013807e d7d35200 df48a0b8 00000004 
c031de34
       c020bb45 d7d35200 00000001 df48a000 00000000 df48a000 df667a14 
c031de7c
Call Trace: [<c0128337>] [<c013807e>] [<c020bb45>] [<c020bea3>] 
[<c02116b4>]
            [<c020b6e4>] [<c020b16c>] [<e19b0571>] [<e19b0660>] 
[<c01f7976>]
            [<e19b05bc>] [<c0109d26>] [<c0109ec2>] [<c0105000>] 
[<c010c0f8>]
            [<c0107010>] [<c0105000>] [<c0107036>] [<c010708b>] 
[<c0105016>]
Code: 8b 02 85 45 f8 74 ef 6a 00 52 e8 97 f8 ff ff 83 c4 08 85 c0

>>EIP; c011554a <__wake_up+2a/5c>   <=====
Trace; c0128336 <unlock_page+7a/84>
Trace; c013807e <end_buffer_io_async+76/84>
Trace; c020bb44 <__scsi_end_request+78/134>
Trace; c020bea2 <scsi_io_completion+1ba/3d0>
Trace; c02116b4 <rw_intr+17c/188>
Trace; c020b6e4 <update_timeout+28/40>
Trace; c020b16c <scsi_old_done+5e0/5f0>
Trace; e19b0570 <[ide-scsi]idescsi_end_request+208/254>
Trace; e19b0660 <[ide-scsi]idescsi_pc_intr+a4/2e8>
Trace; c01f7976 <ide_intr+c2/118>
Trace; e19b05bc <[ide-scsi]idescsi_pc_intr+0/2e8>
Trace; c0109d26 <handle_IRQ_event+2e/5c>
Trace; c0109ec2 <do_IRQ+96/d4>
Trace; c0105000 <_stext+0/0>
Trace; c010c0f8 <call_do_IRQ+6/e>
Trace; c0107010 <default_idle+0/30>
Trace; c0105000 <_stext+0/0>
Trace; c0107036 <default_idle+26/30>
Trace; c010708a <cpu_idle+22/30>
Trace; c0105016 <rest_init+16/20>
Code;  c011554a <__wake_up+2a/5c>
00000000 <_EIP>:
Code;  c011554a <__wake_up+2a/5c>   <=====
   0:   8b 02                     mov    (%edx),%eax   <=====
Code;  c011554c <__wake_up+2c/5c>
   2:   85 45 f8                  test   %eax,0xfffffff8(%ebp)
Code;  c011554e <__wake_up+2e/5c>
   5:   74 ef                     je     fffffff6 <_EIP+0xfffffff6> 
c0115540 <__wake_up+20/5c>
Code;  c0115550 <__wake_up+30/5c>
   7:   6a 00                     push   $0x0
Code;  c0115552 <__wake_up+32/5c>
   9:   52                        push   %edx
Code;  c0115554 <__wake_up+34/5c>
   a:   e8 97 f8 ff ff            call   fffff8a6 <_EIP+0xfffff8a6> 
c0114df0 <try_to_wake_up+0/118>
Code;  c0115558 <__wake_up+38/5c>
   f:   83 c4 08                  add    $0x8,%esp
Code;  c011555c <__wake_up+3c/5c>
  12:   85 c0                     test   %eax,%eax


6 warnings issued.  Results may not be reliable.


 Since I moved from new with 2.4.20-pre5-ac4 (compared to 2.4.19-ac4) 
are also the following messages in dmesg:

yenta 02:05.0: no resource of type 100 available, trying to continue...
yenta 02:05.0: no resource of type 100 available, trying to continue...
yenta 02:05.1: no resource of type 100 available, trying to continue...
yenta 02:05.1: no resource of type 100 available, trying to continue...

 My .config is included.

Martin
-- 
Martin Knoblauch
Senior System Architect
MSC.software GmbH
Am Moosfeld 13
D-81829 Muenchen, Germany

e-mail: martin.knoblauch@mscsoftware.com
http://www.mscsoftware.com
Phone/Fax: +49-89-431987-189 / -7189
Mobile: +49-174-3069245