Behdad Esfahbod wrote:
Oh, my bad. That was against an old fontconfig. With new one I see malloc
failures, perhaps because of a memory corruption... Investigating.
Yes, that sounds more like it.
On Solaris, it depends on what malloc library I use. With the default
malloc (non-scalable but threadsafe allocator), the crashes are often
inside malloc. With libmtmalloc (multi-threaded allocator), they are
often in FcStrListNext, called from FcConfigSubstituteWithPat, like:
sun2:fontconfig)dbx simple-pthread-test core
[...]
t@2 (l@2) terminated by signal SEGV (no mapping at the fault address)
Current function is FcStrListNext
1258 return list->set->strs[list->n++];
(dbx) where
current thread: t@2
=>[1] FcStrListNext(list = 0x8161960), line 1258 in "fcstr.c"
[2] FcConfigSubstituteWithPat(config = 0x8065088, p = 0x8161948,
p_pat = (nil), kind = FcMatchPattern), line 1508 in "fccfg.c"
[3] FcConfigSubstitute(config = (nil), p = 0x8161948, kind =
FcMatchPattern), line 1729 in "fccfg.c"
[4] test_match(thr_num = 1, test_num = 40), line 53 in
"simple-pthread-test.c"
[5] run_test_in_thread(arg = 0x8046e0c), line 68 in
"simple-pthread-test.c"
[6] _thr_setup(0xfe720200), at 0xfee4875b
[7] _lwp_start(0x0, 0x8161964, 0x8161960, 0xfe82ef6c, 0xfeeefc1f,
0x8161960), at 0xfee48a60
This is also what I have now seen on another box (FreeBSD 8.3, 8 core
Opteron, 32 bit ABI, clang 3.0 -- which supports the GCC builtins --
with unmodified Git master):
bsd1:fontconfig)gdb simple-pthread-test simple-pthread-test.core
[...]
#0 0x280afc1c in IA__FcStrListNext (list=Variable "list" is not available.
) at fcstr.c:1258
[...]
(gdb) where
#0 0x280afc1c in IA__FcStrListNext (list=Variable "list" is not available.
) at fcstr.c:1258
#1 0x28096a41 in IA__FcConfigSubstituteWithPat (config=Unhandled dwarf
expression opcode 0x0
) at fccfg.c:1508
#2 0x28097534 in IA__FcConfigSubstitute (config=0x7e0e5f30, p=0x7e0e5f30,
kind=2114871088) at fccfg.c:1729
#3 0x08048886 in test_match (thr_num=39, test_num=243)
at simple-pthread-test.c:53
#4 0x080488ff in run_test_in_thread (arg=0x7fbfe8e4) at
simple-pthread-test.c:68
#5 0x280cb76f in pthread_getprio () from /lib/libthr.so.3
#6 0x00000000 in ?? ()
-Raimund
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