[pacman-dev] [BUG] alpm_list_remove need an initalized pointer for void **data

Dan McGee dpmcgee at gmail.com
Thu Aug 7 10:59:10 EDT 2008

On Thu, Aug 7, 2008 at 9:07 AM, Xavier <shiningxc at gmail.com> wrote:
> On Thu, Aug 7, 2008 at 3:41 PM, Dan McGee <dpmcgee at gmail.com> wrote:
>> (gdb) p d1
>> $1 = (const void *) 0x97b60f0
>> (gdb) p d2
>> $2 = (const void *) 0x97b60f0
>> (gdb) p d1->treename
>> Attempt to dereference a generic pointer.
>> (gdb) p ((pmdb_t)d1)->treename
>> $3 = 0x97b60f0 "\020a{\t0a{\t\220p{\t"
>> (gdb) p ((pmdb_t)d2)->treename
>> $4 = 0x0
> wtf, how is that even possible?

I'm not sure, I feel like GDB is doing something odd here considering
d1 and d2 are identical addresses.

Oh shoot, I see something now. :) I de-refed the instance type, not a
pointer type.

(gdb) p ((pmdb_t*)d1)->treename
$1 = 0x891d130 "extra"
(gdb) p ((pmdb_t*)d2)->treename
$2 = 0x891d130 "extra"

That makes more sense, but with those values, I have no idea why it is
segfaulting. Anyone? I thought it might be due to strcmp() not liking
the same exact string for both inputs, but a quick test put that fear
to rest.


More information about the pacman-dev mailing list