About crash on CentOS

[Novik]

See http://libtorrent.rakshasa.no/ticket/2115 for details.

In gdb wee may to see:

(gdb) s
rak::cacheline_allocator<rak::priority_item*>::alloc_size (size=8)
    at ../rak/allocators.h:79
79          pointer ptr = NULL;
(gdb) n
80          int __UNUSED result = posix_memalign((void**)&ptr, LT_SMP_CACHE_BYTES, size);
(gdb) n
82          return ptr;
(gdb) p result
$6 = 22
(gdb) p ptr
$7 = (rak::priority_item **) 0x0
(gdb) p size
$8 = 8
(gdb) p LT_SMP_CACHE_BYTES
$9 = 1
(gdb) bt
#0  rak::cacheline_allocator<rak::priority_item*>::alloc_size (size=8)
    at ../rak/allocators.h:82
#1  0x00002aaaaaf6c5e7 in rak::cacheline_allocator<rak::priority_item*>::allocate (this=0x2aaaab2ca680, num=1, hint=0x0) at ../rak/allocators.h:76
#2  0x00002aaaaaf6c60f in std::_Vector_base<rak::priority_item*, rak::cacheline_allocator<rak::priority_item*> >::_M_allocate (this=0x2aaaab2ca680, __n=1)
    at /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/stl_vector.h:127
#3  0x00002aaaaaf6c79c in std::vector<rak::priority_item*, rak::cacheline_allocator<rak::priority_item*> >::_M_insert_aux (this=0x2aaaab2ca680, __position=Cannot access memory at address 0x0
)
    at /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/vector.tcc:275
#4  0x00002aaaaaf6c9f0 in std::vector<rak::priority_item*, rak::cacheline_allocator<rak::priority_item*> >::push_back (this=0x2aaaab2ca680,
    __x=@0x7fffffffe290)
    at /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/stl_vector.h:610
#5  0x00002aaaaaf6ca10 in rak::priority_queue<rak::priority_item*, rak::priority_compare, std::equal_to<rak::priority_item*>, rak::cacheline_allocator<rak::priority_item*> >::push (this=0x2aaaab2ca680, value=@0x7fffffffe290)
    at ../rak/priority_queue.h:77
#6  0x00002aaaaaf6cf8e in rak::priority_queue_insert (queue=0x2aaaab2ca680,
    item=0x820d98, t=...) at ../rak/priority_queue_default.h:116
#7  0x00002aaaaaf69571 in torrent::Manager::Manager (this=0x820d20)
    at manager.cc:89
#8  0x00002aaaaaf8aa54 in torrent::initialize (poll=0x8124b0) at torrent.cc:104
#9  0x0000000000412aab in main (argc=1, argv=0x7fffffffe998) at main.cc:198

e.q. LT_SMP_CACHE_BYTES is setted to 1, this is a invalid value.

And yes, in config.h (after configure) we may to see:

#define LT_SMP_CACHE_BYTES 1

For avoid this you must remove the superfluous comma in files libtorrent/scripts/common.m4 and rtorrent/scripts/common.m4, e.q. replace lines

AC_DEFINE(LT_SMP_CACHE_BYTES, 128, Largest L1 cache size we know of, should work on all archs.)

to

AC_DEFINE(LT_SMP_CACHE_BYTES, 128, Largest L1 cache size we know of)

and all will be OK.

[rakshasa]

Fixed. (and deleted the old ticket due to spam)