AHA 2940 error when using DAT-streamer

[Christoph Müller]

Hi all,

I have an Adaptec 2940 Controller and in the various ways
I have tried to use it, it never really functioned.
Errors always occur when making backups to an HP-SCSI-streamer,
to be exact errors occur during verify from the streamer.

I have used Linux versions from 2.0.30 through 2.0.34

I used to have an IBM 1 GB disc, now I have a Quantum 3210S 3.2 GB

I checked cabling and termination.

I reduced speed, disabled and enabled disconnection and syncmode.

I used a seperat controller (Adaptec 1502) for the streamer.

Nothing seems to have any effect. Using the controller normally
is ok, but verifying a backup on tape brings always brings up the 
same error, which is totally reproduceable.
In the meantime I am using an old Adaptec 1502 controller with no
problems at all, it is just a little bit slow.

Below this is listed what kind of error-messages I get, the content
of the error message varies, depending on the settings, sometimes 
it says something about timeouts, bad waiting queus etc. The error
itself always leads to a system crash, sometimes I can still shutdown
the system, sometimes I have to use the power switch.

Any suggustions on what to do would be very welcome.

Thanks in advance,

Christoph Mueller
mueller-dlg at t-online.de

typical error message when verifying a tape backup (about an hour
after starting).

Jun 21 14:12:34 linux kernel: Unable to handle kernel NULL pointer 
                dereference at virtual address c0000006
Jun 21 14:12:34 linux kernel: current->tss.cr3 = 00101000, Xr3 = 00101000
Jun 21 14:12:34 linux kernel: *pde = 00102067
Jun 21 14:12:34 linux kernel: *pte = 00000000
Jun 21 14:12:34 linux kernel: Oops: 0002
Jun 21 14:12:34 linux kernel: CPU:    0
Jun 21 14:12:34 linux kernel: EIP:    0010:[try_to_free_buffer+19/640]
Jun 21 14:12:34 linux kernel: EFLAGS: 00010246
Jun 21 14:12:34 linux kernel: eax: 00006fb8   ebx: 00000006   ecx: 00000006
                              edx: 01330100
Jun 21 14:12:34 linux kernel: esi: 000000f7   edi: 00000006   ebp: 00006fb8
                              esp: 00006f84
Jun 21 14:12:34 linux kernel: ds: 0018   es: 0018   fs: 0018   gs: 0018   
                              ss: 0018
Jun 21 14:12:34 linux kernel: Process kswapd (pid: 3, process nr: 3, 
                              stackpage=00006000)
Jun 21 14:12:34 linux kernel: Stack: 00265858 000000f7 000007f3 
                              00002000 0011e4fc 01330198 00006fb8 00000006
Jun 21 14:12:34 linux kernel:        00000006 00000001 00000003 
                              00000000 00000000 01330198 00121f48 00000006
Jun 21 14:12:34 linux kernel:        00000000 00000001 00000003 
                              0009afdc 00000000 00009000 00122171 00000003
Jun 21 14:12:34 linux kernel: Call Trace: [shrink_mmap+444/528] 
      [try_to_free_page+88/208] [kswapd+321/336] [init+70/624] [kswapd+0/336]
Jun 21 14:12:34 linux kernel: Code: 89 2f 8b 7d 24 81 e7 00 f0 ff ff 89 7c 
                                    24 10 89 ee 85 f6 75
Jun 21 14:12:34 linux kernel: Unable to handle kernel NULL pointer 
                              dereference at virtual address c000006
Jun 21 14:12:34 linux kernel: current->tss.cr3 = 0179d000, Xr3 = 0179d000
Jun 21 14:12:34 linux kernel: *pde = 00102067
Jun 21 14:12:34 linux kernel: *pte = 00000000
Jun 21 14:12:34 linux kernel: Oops: 0002
Jun 21 14:12:34 linux kernel: CPU:    0
Jun 21 14:12:34 linux kernel: EIP:    0010:[try_to_free_buffer+19/640]
Jun 21 14:12:34 linux kernel: EFLAGS: 00010246
Jun 21 14:12:34 linux kernel: eax: 01a19ed4   ebx: 00000006   ecx: 00000006   edx: 01330100
Jun 21 14:12:34 linux kernel: esi: 000000ff   edi: 00000006   ebp: 01a19ed4   esp: 01a19ea0
Jun 21 14:12:34 linux kernel: ds: 0018   es: 0018   fs: 002b   gs: 002b   ss: 0018
Jun 21 14:12:34 linux kernel: Process tar (pid: 429, process nr: 61, stackpage=01a19000)
Jun 21 14:12:34 linux kernel: Stack: 00265858 000000ff 000007ff 00002000 0011e4fc 01330198 01a19ed4 00000006 
Jun 21 14:12:34 linux kernel:        00000006 00000001 00000000 00000000 01adf000 01330198 00121f48 00000006 
Jun 21 14:12:34 linux kernel:        00000000 00000001 00000003 00000058 00000000 01adf000 00122a76 00000003 
Jun 21 14:12:34 linux kernel: Call Trace: [shrink_mmap+444/528] [try_to_free_page+88/208] [__get_free_pages+438/464] [try_to_read_ahead+40/304] [generic_file_read+704/1584] [sys_read+204/256] [system_call+85/128] 
Jun 21 14:12:34 linux kernel: Code: 89 2f 8b 7d 24 81 e7 00 f0 ff ff 89 7c 24 10 89 ee 85 f6 75 



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