-(root@abyss)-(~)- # gdb mdadm
GNU gdb 6.2
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This GDB was configured as "i686-pc-linux-gnu"...Using host libthread_db
library "/lib/libthread_db.so.1".
(gdb) b 'Manage_subdevs'
Breakpoint 1 at 0x804fcb6: file Manage.c, line 174.
(gdb) run --manage --add /dev/md0 /dev/sdaa
Starting program: /sbin/mdadm --manage --add /dev/md0 /dev/sdaa
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
Breakpoint 1, Manage_subdevs (devname=0xbfe0de75 "/dev/md0", fd=7,
devlist=0x8067018) at Manage.c:174
174 void *dsuper = NULL;
(gdb) n
176 if (ioctl(fd, GET_ARRAY_INFO, &array)) {
(gdb) n
181 for (dv = devlist ; dv; dv=dv->next) {
(gdb) n
182 if (stat(dv->devname, &stb)) {
(gdb) n
187 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
(gdb) n
192 switch(dv->disposition){
(gdb) n
200 tfd = open(dv->devname, O_RDONLY|O_EXCL);
(gdb) n
201 if (tfd < 0) {
(gdb) n
206 close(tfd);
(gdb) n
210 if (md_get_version(fd)%100 < 2) {
(gdb) n
212 if (ioctl(fd, HOT_ADD_DISK,
(gdb) n
219 fprintf(stderr, Name ": hot add
failed for %s: %s\n",
(gdb) n
mdadm: hot add failed for /dev/sdaa: Invalid argument
221 return 1;
(gdb) n
307 }
(gdb) n
main (argc=5, argv=0xbfe0cb14) at mdadm.c:810
810 if (!rv && readonly < 0)
(gdb) n
812 if (!rv && runstop)
(gdb) n
1072 exit(rv);
(gdb) n
Program exited with code 01.
-- David M. Strang
----- Original Message -----
From: Neil Brown
To: David M. Strang
Cc: linux-raid@xxxxxxxxxxxxxxx
Sent: Sunday, July 17, 2005 9:06 PM
Subject: Re: Raid5 Failure
On Sunday July 17, dstrang@xxxxxxxxxxxxxx wrote:
I'm not real good with GDB... but I'm giving it a shot.
(gdb) run -a /dev/md0 /dev/sdaa
Starting program: /sbin/mdadm -a /dev/md0 /dev/sdaa
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
Breakpoint 1, Manage_subdevs (devname=0xbfe75e5f "/dev/md0", fd=7,
devlist=0x8067018) at Manage.c:174
174 void *dsuper = NULL;
(gdb) c
At this point you need to use 'n' for 'next', to step through the code
one statement at a time.
When you see:
176 if (ioctl(fd, GET_ARRAY_INFO, &array)) {
enter 'n' again, to execute that, then
print array
to print the 'array' structure.
Then continue with 'n' repeatedly.
NeilBrown
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