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SubjectPROBLEM: reading large volumes of data from a Segate Baracuda
When attempting to read large volumes of data from a Segate Baracuda, I
encounter some strage problems. Under kernel version 2.2.14 the system
completely crashes, locks up and the console is filled with debugging
information (I do not know of a way to capture this since the machine is no
longer responding). Under kernel 2.3.47 the console briefly displays
similiar debugging information (for about 0.5sec) and resumes normal
operation. The following however is logged to the system log:

Output from /var/log/syslog under kernel 2.3.47
--
Feb 27 14:58:21 darth-vader kernel: kmem_free: Bad obj addr (objp=c3bfd980,
name=buffer_head)
Feb 27 14:58:21 darth-vader kernel: kernel BUG at slab.c:1651!
Feb 27 14:58:21 darth-vader kernel: invalid operand: 0000
Feb 27 14:58:21 darth-vader kernel: CPU: 0
--

keywords: ide disk io, memory (slab.c was found in the mm directory)

darth-vader:/usr/src/linux# cat /proc/version
Linux version 2.3.47 (root@darth-vader) (gcc version 2.7.2.3) #1 Sun Feb 27
14:3 8:40 EST 2000

darth-vader:/usr/src/linux/scripts# ./ver_linux
-- Versions installed: (if some fields are empty or look
-- unusual then possibly you have very old versions)
Linux darth-vader 2.3.47 #1 Sun Feb 27 14:38:40 EST 2000 i586 unknown
Kernel modules 2.1.121
Gnu C 2.7.2.3
Binutils 2.9.1.0.19
Linux C Library 2.0.7
Dynamic linker ldd: version 1.9.10
Procps 1.2.9
Mount 2.9g
Net-tools 2.01
Kbd 0.96
Sh-utils 1.16
Modules Loaded

darth-vader:/proc# cat cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 5
model : 4
model name : Pentium MMX
stepping : 3
cpu MHz : 200.456217
fdiv_bug : no
hlt_bug : no
sep_bug : no
f00f_bug : yes
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr mce cx8 mmx
bogomips : 399.77

darth-vader:/proc# cat /proc/modules
darth-vader:/proc#

(hdc is the disk that the problem occurs on)

darth-vader:/proc/ide/hdc# cat driver
ide-disk version 1.09

darth-vader:/proc/ide/hdc# cat settings
name value min max
mode
---- ----- --- ---
----
bios_cyl 39761 0 65535 rw
bios_head 16 0 255 rw
bios_sect 63 0 63 rw
breada_readahead 4 0 127 rw
bswap 0 0 1 r
file_readahead 0 0 2097151 rw
ide_scsi 0 0 1 rw
io_32bit 0 0 3 rw
keepsettings 0 0 1 rw
max_kb_per_request 64 1 127 rw
multcount 0 0 8 rw
nice1 1 0 1 rw
nowerr 0 0 1 rw
pio_mode write-only 0 255 w
slow 0 0 1 rw
unmaskirq 0 0 1 rw
using_dma 0 0 1 rw


darth-vader:/proc/ide/hdc# cat geometry
physical 39761/16/63
logical 39761/16/63

darth-vader:/proc/ide/hdc# cat model
ST320430A

darth-vader:/proc# cat slabinfo
slabinfo - version: 1.0
kmem_cache 37 62 124
nfs_wreq 0 0 284
nfs_dcookie 0 0 60
nfs_fh 0 0 60
tcp_tw_bucket 1 42 92
tcp_bind_bucket 14 127 28
tcp_open_request 0 63 60
inet_peer_cache 0 63 60
ip_fib_hash 15 127 28
ip_dst_cache 18 25 156
arp_cache 3 31 124
skbuff_head_cache 279 300 156
sock 35 40 796
filp 263 294 92
inode_cache 3127 3135 348
bdev_cache 5 63 60
signal_queue 2 29 132
kiobuf 0 0 220
buffer_head 46721 47616 124
mm_struct 22 50 156
vm_area_struct 377 504 60
dentry_cache 3531 3534 124
files_cache 21 27 444
uid_cache 3 127 28
size-131072 0 0 131072
size-65536 0 0 65536
size-32768 0 0 32768
size-16384 0 0 16384
size-8192 0 0 8192
size-4096 8 8 4096
size-2048 106 112 2048
size-1024 19 24 1024
size-512 38 40 512
size-256 33 42 284
size-128 615 625 156
size-64 98 126 92
size-32 322 378 60
slab_cache 40 63 60


I will be happy to provide any further information required to debug this
problem. Thanks!

Regards, Simon

Simon Blainey
Infrastructure and Open Technologies
IBM Global Services Australia
+61-402-036-347 sblainey@au1.ibm.com



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