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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This archive was generated by hypermail 2b29 : Tue Feb 29 2000 - 21:00:16 EST