possible bug? (or my buggy hardware more likely)

[Dom]

hi, im running debian woody and i did this:

localhost:/mnt# cat /dev/sg0
Segmentation fault

then cat segfaulted.  i played with it and could not
get it to reproduce itself except one time.  at the
time i was messing with ide-scsi in the kernel (2.6.1)


i did however manage to run an strace as the next
thing i did, here is the result:

execve("/bin/cat", ["cat", "/dev/sg0"], [/* 16 vars
*/]) = 0
uname({sys="Linux", node="localhost", ...}) = 0
brk(0)                                  = 0x804c000
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40017000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT
(No such file or directory)
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT
(No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=51254, ...})
= 0
old_mmap(NULL, 51254, PROT_READ, MAP_PRIVATE, 3, 0) =
0x40018000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT
(No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY)    = 3
read(3,
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\200X\1"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1270908,
...}) = 0
old_mmap(NULL, 1281292, PROT_READ|PROT_EXEC,
MAP_PRIVATE, 3, 0) = 0x40025000
old_mmap(0x40153000, 36864, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED, 3, 0x12d000) = 0x40153000
old_mmap(0x4015c000, 7436, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) =
0x4015c000
close(3)                                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4015e000
shutdown(-1073743580, 1 /* send */)     = 0
munmap(0x40018000, 51254)               = 0
brk(0)                                  = 0x804c000
brk(0x806d000)                          = 0x806d000
brk(0) fstat64(1, {st_mode=S_IFCHR|0600,
st_rdev=makedev(136, 0), ...}) = 0
open("/dev/sg0", O_RDONLY|O_LARGEFILE)  = 3
fstat64(3, {st_mode=S_IFCHR|0600, st_rdev=makedev(21,
0), ...}) = 0
read(3,  <unfinished ...>
+++ killed by SIGSEGV +++
localhost:/mnt# strace cat /dev/sg0
execve("/bin/cat", ["cat", "/dev/sg0"], [/* 16 vars
*/]) = 0
uname({sys="Linux", node="localhost", ...}) = 0
brk(0)                                  = 0x804c000
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40017000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT
(No such file or directory)
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT
(No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=51254, ...})
= 0
old_mmap(NULL, 51254, PROT_READ, MAP_PRIVATE, 3, 0) =
0x40018000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT
(No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY)    = 3
read(3,
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\200X\1"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1270908,
...}) = 0
old_mmap(NULL, 1281292, PROT_READ|PROT_EXEC,
MAP_PRIVATE, 3, 0) = 0x40025000
                                 = 0x806d000
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4015e000
shutdown(-1073743580, 1 /* send */)     = 0
munmap(0x40018000, 51254)               = 0
brk(0)                                  = 0x804c000
brk(0x806d000)                          = 0x806d000
brk(0)                                  = 0x806d000
fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136,
0), ...}) = 0
open("/dev/sg0", O_RDONLY|O_LARGEFILE)  = 3
fstat64(3, {st_mode=S_IFCHR|0600, st_rdev=makedev(21,
0), ...}) = 0
read(3,  <unfinished ...>
+++ killed by SIGSEGV +++


localhost:/mnt# cat --version
cat (GNU textutils) 2.0

weird.. but now if i do cat /dev/sg0 nothing bad
happens i just get 'no such device'  i suspect it is
my hardware or kernel and not the cat program itself,
but i found it suspicious that it would cause a
segfault/

later
-Dom

=====
Dominic C. [binary1230(AT)yahoo.com]
http://einsteinsbreakfast.com

__________________________________
Do you Yahoo!?
Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes
http://hotjobs.sweepstakes.yahoo.com/signingbonus