Joey Hess wrote:
> Tried building curl from source to get a useful backtrace, but that
> build didn't have the problem.
>
> Since that build was done using gcc 4.9.2-4, it may be another hint in
> the direction of the recent gcc transitions.
Indeed, I built curl with gcc 5.2.1-4 and it has the problem.
So, the gcc upgrade led to this problem.
Here is the backtrace:
joey@kite:~/tmp/curl-7.44.0/debian>LD_LIBRARY_PATH=./build/lib/.libs/ gdb /lib64/ld-linux-x86-64.so.2
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Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/ld-2.19.so...done.
done.
(gdb) run ./build/src/.libs/curl
Starting program: /lib64/ld-linux-x86-64.so.2 ./build/src/.libs/curl
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
fputc (c=99, fp=0x0) at fputc.c:37
37 fputc.c: No such file or directory.
(gdb) bt
#0 fputc (c=99, fp=0x0) at fputc.c:37
#1 0x00007ffff7b7cd9f in dprintf_formatf (data=<optimized out>,
stream=0x7ffff73d7470 <fputc>, format=<optimized out>,
ap_save=ap_save@entry=0x7fffffffe060) at mprintf.c:616
#2 0x00007ffff7b7e58e in curl_mfprintf (whereto=<optimized out>,
format=<optimized out>) at mprintf.c:1121
#3 0x00007ffff7ddae51 in ?? ()
#4 0x0000000000000000 in ?? ()
The code here is quite horrible, kind of looks like the FILE * has
been somehow optimised out, perhaps wrongly?
static int dprintf_formatf(
void *data, /* untouched by format(), just sent to the stream() function in
the second argument */
/* function pointer called for each output character */
int (*stream)(int, FILE *),
OUTCHAR(*f);
#define OUTCHAR(x) \
do{ \
if(stream((unsigned char)(x), (FILE *)data) != -1) \
done++; \
else \
return done; /* return immediately on failure */ \
} WHILE_FALSE
--
see shy jo
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