Bugs item #3093811, was opened at 2010-10-23 17:42
Message generated for change (Tracker Item Submitted) made by waker
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Category: libcurl
Group: crash
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: waker (waker)
Assigned to: Daniel Stenberg (bagder)
Summary: random segfault

Initial Comment:
curl/libcurl version 7.21.2
OS version: arch linux (latest)

random crash started to happen after upgrade to 7.21.2

there's seems to be a regression, downgrading to 7.21.1 fixes the problem

bracktrace reported by a user of my app (below)
there is only one thread running which uses libcurl.

#4-#6 seem weird, because my mutex_unlock function shouldn't call Curl_resolv_timeout

http_curl_control function is a callback for CURLOPT_PROGRESSFUNCTION

it only calls curl_easy_getinfo

if you need more info - please let me know.

Program received signal SIGSEGV, Segmentation fault.
0xb764602b in addbyter () from /usr/lib/libcurl.so.4
(gdb) bt
#0 0xb764602b in addbyter () from /usr/lib/libcurl.so.4
#1 0xb764528f in dprintf_formatf () from /usr/lib/libcurl.so.4
#2 0xb764609e in curl_mvsnprintf () from /usr/lib/libcurl.so.4
#3 0xb762f927 in Curl_failf () from /usr/lib/libcurl.so.4
#4 0xb7623e2f in Curl_resolv_timeout () from /usr/lib/libcurl.so.4
#5 0x08058271 in mutex_unlock (_mtx=136059256) at threading_pthread.c:152
#6 0xb557cbb9 in http_curl_control (stream=0xbb8, dltotal=5.0893833312885161e-270, dlnow=1.9354898159419373e-317,
    ultotal=-1.0003725070461691e-51, ulnow=0) at vfs_curl.c:470
#7 0xb557bce7 in http_curl_write_wrapper (fp=0x833e800, ptr=0x838a2e0, size=15361) at vfs_curl.c:129
#8 0xb557c499 in http_curl_write (ptr=0x8388108, size=1, nmemb=16384, stream=0x833e800) at vfs_curl.c:295
#9 0xb762ff61 in Curl_client_write () from /usr/lib/libcurl.so.4
#10 0xb764a611 in readwrite_data () from /usr/lib/libcurl.so.4
#11 0xb764adf5 in Curl_readwrite () from /usr/lib/libcurl.so.4
#12 0xb764b89d in Transfer () from /usr/lib/libcurl.so.4
#13 0xb764c653 in Curl_do_perform () from /usr/lib/libcurl.so.4
#14 0xb764c8db in Curl_perform () from /usr/lib/libcurl.so.4
#15 0xb764d10e in curl_easy_perform () from /usr/lib/libcurl.so.4
#16 0xb557d0cf in http_thread_func (ctx=0x833e800) at vfs_curl.c:556
#17 0xb7e12e60 in start_thread () from /lib/libpthread.so.0
#18 0xb7d8ffbe in clone () from /lib/libc.so.6

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Received on 2010-10-23