curl-library
segfault with gzip encoding support
Date: Mon, 22 Dec 2003 16:54:43 -0800 (PST)
Hi,
We have been having problems with using multiple threads and downloading
websites with 'gzip' content-encoding support. A backtrace from gdb is
pasted below. This happens on a FreeBSD machine [4.8-release, 2gb ram].
I then wrote a simple python program which does nothing else except create
threads and each thread uses pycurl which uses curl-7.10.8 and does a
simple get with encoding set to 'gzip'. The program segfaults. (zlib
version 1.1.4)
I am not sure whether the problem is with libcurl or with pycurl. Have
there been any other problems reported with gzip encoding support and
multiple threads (esp on freebsd machines)? Any suggestions ? Thanks.
Vikram
-----------------------------------------------------------------
first backtrace:
#0 0x884eb302 in zmemcpy (
dest=0xbfaedd6c ' ' <repeats 13 times>, "<html> <head>
<title>Welcome to AdWords</title> <link href=\"AdsLater.css\"
rel=\"stylesheet\"> <style type=\"text/css\"><!--\n\n
div.buttonborder {\n width: auto;\n border: 2"...,
source=0x8503000 ' ' <repeats 13 times>, "<html> <head>
<title>Welcome to AdWords</title> <link href=\"AdsLater.css\"
rel=\"stylesheet\"> <style type=\"text/css\"><!--\n\n
div.buttonborder {\n width: auto;\n border: 2"..., len=5074)
at zutil.c:68
#1 0x884ee5cd in inflate_flush (s=0x8471900, z=0x83c93bc, r=0) at
infutil.c:50
#2 0x884ee46a in inflate_codes (s=0x8471900, z=0x83c93bc, r=0) at
infcodes.c:237
#3 0x884ecd55 in inflate_blocks (s=0x8471900, z=0x83c93bc, r=0) at
infblock.c:340
#4 0x884eb908 in inflate (z=0x83c93bc, f=2) at inflate.c:221
#5 0x883beb2b in Curl_unencode_gzip_write (data=0x8356000, k=0x83c9358,
nread=1572) at content_encoding.c:326
#6 0x883bb300 in Curl_readwrite (conn=0x83c9000, done=0xbfafdf23 "") at
transfer.c:990
#7 0x883bbe04 in Transfer (conn=0x83c9000) at transfer.c:1401
#8 0x883bc563 in Curl_perform (data=0x8356000) at transfer.c:1875
#9 0x883bc8d9 in curl_easy_perform (curl=0x8356000) at easy.c:261
#10 0x88397953 in do_curl_perform (self=0x833c40c, args=0x815f02c) at
pycurl.c:651
#11 0x80f7344 in PyCFunction_Call ()
#12 0x80b2cb2 in call_function ()
#13 0x80b017c in eval_frame ()
#14 0x80b16f1 in PyEval_EvalCodeEx ()
-----------------------------------------------------------------------------
second backtrace:
#0 0x88383915 in Curl_unencode_gzip_write (data=0x82d8000, k=0x8284b58,
nread=1294) at content_encoding.c:210
#1 0x88380300 in Curl_readwrite (conn=0x8284800, done=0xbfafe843 "") at
transfer.c:990
#2 0x88380e04 in Transfer (conn=0x8284800) at transfer.c:1401
#3 0x88381563 in Curl_perform (data=0x82d8000) at transfer.c:1875
#4 0x883818d9 in curl_easy_perform (curl=0x82d8000) at easy.c:261
#5 0x8835c953 in do_curl_perform (self=0x82cfc0c, args=0x815f02c) at
pycurl.c:651
#6 0x80f7344 in PyCFunction_Call ()
#7 0x80b2cb2 in call_function ()
#8 0x80b017c in eval_frame ()
#9 0x80b16f1 in PyEval_EvalCodeEx ()
#10 0x80b2fcd in fast_function ()
#11 0x80b2d85 in call_function ()
#12 0x80b017c in eval_frame ()
#13 0x80b16f1 in PyEval_EvalCodeEx ()
#14 0x80b2fcd in fast_function ()
#15 0x80b2d85 in call_function ()
#16 0x80b017c in eval_frame ()
#17 0x80b16f1 in PyEval_EvalCodeEx ()
#18 0x80f6c5e in function_call ()
#19 0x805ace7 in PyObject_Call ()
#20 0x80b2950 in PyEval_CallObjectWithKeywords ()
#21 0x80daf37 in t_bootstrap ()
#22 0x8816a0a8 in _thread_start () from /usr/lib/libc_r.so.4
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Received on 2003-12-23