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Subject[CRASH] gdth / __block_prepare_write: zeroing uptodate buffer! / NMI Watchdog detected LOCKUP

i have been looking for deadlocks we are experiencing on a couple of
SMP machines (Dual Celeron and Dual PIII). After a night stressing a
spare machine with dbench/bonnie++/tcpspray the machine locked up 30
minutes after i killed the test. The last messages on the console were:

__block_prepare_write: zeroing uptodate buffer!

15 times - Machine was answering ping first but stopped after a couple
of minutes. Another couple of minutes later the nmi_watchdog stepped in
and produced an oops:

ksymoops 2.3.4 on i686 2.4.18-pre4. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.18-pre4/ (default)
-m /boot/ (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

NMI Watchdog detected LOCKUP on CPU0, registers:
CPU: 0
EIP: 0010:[<c01cc34d>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00000086
eax: c0094000 ebx: c0096d2c ecx: 00000002 edx: 00000000
esi: f880a000 edi: c0094084 ebp: c0094084 esp: f7ddbe80
ds: 0018 es: 0018 ss: 0018
Process scsi_eh_2 (pid: 8, stackpage=f7ddb000)
Stack: 0000001e f880a000 c0094084 00000000 00000001 00000009 c0096c16 00000086
f880a000 c0094084 00000000 c01cb2b2 00000000 000186a0 c0094084 00000000
00000002 00000000 00000018 c01c8e74 00000012 c0094084 00000000 c0094084
Call Trace: [<c01cb2b2>] [<c01c8e74>] [<c01c9036>] [<c01cbde4>] [<c01b7e25>]
[<c01b85a7>] [<c01b8b1b>] [<c01056f4>]
Code: 7e f9 e9 4f d0 ff ff 80 3f 00 f3 90 7e f9 e9 53 da ff ff 80

>>EIP; c01cc34d <_text_lock_gdth+e1/154> <=====
Trace; c01cb2b2 <gdth_interrupt+6ce/6d8>
Trace; c01c8e74 <gdth_wait+5c/ac>
Trace; c01c9036 <gdth_internal_cmd+172/1b8>
Trace; c01cbde4 <gdth_eh_bus_reset+1b4/36c>
Trace; c01b7e25 <scsi_try_bus_reset+89/118>
Trace; c01b85a7 <scsi_unjam_host+357/72c>
Trace; c01b8b1b <scsi_error_handler+19f/1f9>
Trace; c01056f4 <kernel_thread+28/38>
Code; c01cc34d <_text_lock_gdth+e1/154>
00000000 <_EIP>:
Code; c01cc34d <_text_lock_gdth+e1/154> <=====
0: 7e f9 jle fffffffb <_EIP+0xfffffffb> c01cc348 <_text_lock_gdth+dc/154> <=====
Code; c01cc34f <_text_lock_gdth+e3/154>
2: e9 4f d0 ff ff jmp ffffd056 <_EIP+0xffffd056> c01c93a3 <gdth_next+53/b5c>
Code; c01cc354 <_text_lock_gdth+e8/154>
7: 80 3f 00 cmpb $0x0,(%edi)
Code; c01cc357 <_text_lock_gdth+eb/154>
a: f3 90 repz nop
Code; c01cc359 <_text_lock_gdth+ed/154>
c: 7e f9 jle 7 <_EIP+0x7> c01cc354 <_text_lock_gdth+e8/154>
Code; c01cc35b <_text_lock_gdth+ef/154>
e: e9 53 da ff ff jmp ffffda66 <_EIP+0xffffda66> c01c9db3 <gdth_next+a63/b5c>
Code; c01cc360 <_text_lock_gdth+f4/154>
13: 80 00 00 addb $0x0,(%eax)

1 warning issued. Results may not be reliable.

Software: 2.4.18-pre4, ext2 filesystems, no highmem
Hardware: Dual PIII 1GHz, 1GB Ram,
ICP Vortex GDT6523RS ( 6 Disks with hardware raid 1 )
GDTH Firmware is latest 2.28.06-R049

I am now booting with 2.4.19-pre1 and will try to crash it again

Florian Lohoff +49-5201-669912
Nine nineth on september the 9th Welcome to the new billenium
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