Bugs item #1618377, was opened at 2006-12-19 01:41
Message generated for change (Comment added) made by gibigaba
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Category: libcurl
Group: crash
Status: Open
Resolution: None
Priority: 8
Private: No
Submitted By: Mikhail (gibigaba)
Assigned to: Daniel Stenberg (bagder)
Summary: SIGSEGV, when using multi interface

Initial Comment:
Multithread, software, that running for weeks - randomly crashes with SIGSEGV.
Valgrind reports following:

....
==13483== Thread 20:
==13483== Invalid read of size 4
==13483== at 0x4146781: Curl_done (url.c:4039)
==13483== by 0x41583C8: multi_runsingle (multi.c:1020)
==13483== by 0x4158FEE: curl_multi_perform (multi.c:1326)
....
==13483== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==13483==
==13483== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==13483== Access not within mapped region at address 0x0
==13483== at 0x4146781: Curl_done (url.c:4039)
==13483== by 0x41583C8: multi_runsingle (multi.c:1020)
==13483== by 0x4158FEE: curl_multi_perform (multi.c:1326)
......

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>Comment By: Mikhail (gibigaba)
Date: 2006-12-19 15:06

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I'll try, after I check CVS

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Comment By: Daniel Stenberg (bagder)
Date: 2006-12-19 14:20

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Just to clarify: are you using the multi interface in multiple threads?

Can you write up a small source code sample for us that we can work with
that would crash for you (assuming the crash is still present when you've
tested a recent CVS )?

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Comment By: Mikhail (gibigaba)
Date: 2006-12-19 14:17

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It downloads several files via http, through proxy at the same time, using
many threads.
I'll try CVS snapshot this week.

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Comment By: Daniel Stenberg (bagder)
Date: 2006-12-19 13:01

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So tell us more about your application and what we can do in our ends to
repepat this problem. Have you tried with a recent CVS snapshot to see if
it behaves the same?

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Comment By: Mikhail (gibigaba)
Date: 2006-12-19 04:04

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gcc (GCC) 4.1.1

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Comment By: Mikhail (gibigaba)
Date: 2006-12-19 04:03

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Linux testserver 2.6.18.2 #1 SMP Mon Nov 13 08:06:00 CST 2006 i686 i686
i386 GNU/Linux
curl version: libcurl/7.16.0 OpenSSL/0.9.7a zlib/1.2.1.2 c-ares/1.3.2
libidn/0.5.6

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Comment By: Dan Fandrich (dfandrich)
Date: 2006-12-19 01:50

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What libcurl version, platform, OS, OS version, compiler?

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Received on 2006-12-19