<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<p>Dear Troy,</p>
<p>Thank you so much for the help and all your work on this.
Unfortunately the issue is still not resolved for me based on your
latest commits.<br>
</p>
<p>I have n threads that all run InstallMgr::refreshRemoteSource. n
corresponds to the number of repositories available, so it's
currently 10.<br>
The operation works until at some point things start hanging
again. Sometime it happens after ten consecutive calls of the
update function, sometimes already after three times and I also
had it hanging after only one attempt.<br>
In the calling function the hanging occurs when I join the threads
(waiting for them to complete).<br>
<br>
Looking at details in gdb I find this at the point of hanging:</p>
<p><tt>(gdb) info threads</tt><tt><br>
</tt><tt> Id Target Id Frame </tt><tt><br>
</tt><tt> 102 Thread 0x7f8e3cdd1700 (LWP 46520) "node_sword_cli"
0x000056411eacb46c in sword::FileMgr::sysOpen(sword::FileDesc*)
()</tt><tt><br>
</tt><tt> 95 Thread 0x7f8e37fff700 (LWP 46514) "node_sword_cli"
0x000056411eacb283 in sword::FileMgr::sysOpen(sword::FileDesc*)
()</tt><tt><br>
</tt><tt> 93 Thread 0x7f8e3ddf6700 (LWP 46511) "node_sword_cli"
0x000056411eacb283 in sword::FileMgr::sysOpen(sword::FileDesc*)
()</tt><tt><br>
</tt><tt> 91 Thread 0x7f8e2bfff700 (LWP 46510) "node_sword_cli"
0x000056411eacb46c in sword::FileMgr::sysOpen(sword::FileDesc*)
()</tt><tt><br>
</tt><tt>* 90 Thread 0x7f8e2b7fe700 (LWP 46509) "node_sword_cli"
0x000056411eacb296 in sword::FileMgr::sysOpen(sword::FileDesc*)
()</tt><tt><br>
</tt><tt> 1 Thread 0x7f8e3ddf9e00 (LWP 46380) "node_sword_cli"
0x00007f8e40d98cd7 in __pthread_clockjoin_ex () from
/lib/x86_64-linux-gnu/libpthread.so.0</tt><tt><br>
</tt></p>
<p><tt>And this stacktrace for each individual thread (relevant
portion):</tt><tt><br>
</tt><tt>#0 0x000056411eacb46c in
sword::FileMgr::sysOpen(sword::FileDesc*) ()</tt><tt><br>
</tt><tt>#1 0x000056411eab4b0b in sword::FileDesc::getFd() ()</tt><tt><br>
</tt><tt>#2 0x000056411eb2fb70 in
sword::ZipCompress::unTarGZ(sword::FileDesc*, char const*) ()</tt><tt><br>
</tt><tt>#3 0x000056411eae4437 in
sword::InstallMgr::refreshRemoteSource(sword::InstallSource*) ()</tt><br>
</p>
<p>I'm not sure whether all of these threads here are now hanging or
only one of them. It could be just the one that the main function
tries to join right now.</p>
<p>Another observation is that I am getting random output like this
during the process (it happens with different conf files, not this
one all the time):</p>
<p><tt>error writing
/home/tobi/.sword/installMgr/20120711005000/mods.d/ngu_BL_1987.conf
skipping...</tt><br>
<br>
I didn't get these error messages with earlier SVN revisions.<br>
</p>
<p>To be sure I just once more tested with SVN Rev. 3759 and there I
consistently get 20 out of 20 attempts successful.<br>
</p>
<p>Best regards,<br>
Tobias<br>
</p>
<div class="moz-cite-prefix">On 10/15/20 8:09 PM, Troy A. Griffitts
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5a02225c-4948-818d-8a0d-b0b8c3310835@crosswire.org">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Dear Tobias,</p>
<p>Thank you for all the great information. This enabled me to
isolate the change which caused the issue.</p>
<p>So, for a bit of background, SWORD has no calls to mark
critical sections which might be problematic for re-entrant
usage. This has been due to the many implementations of
threading across many different platforms over the years, before
C++11. But, as a policy to support clients which desire to use
SWORD in a multithreaded manner, we do our best to make this
safe by advising clients to use separate SWMgr instances per
thread. There are still some shared objects in this scenario,
but we do our best to do all the writing to these shared objects
upon initialization. We broke this rule in commit 2760, which
is what caused your problem. SWORD have a facility to pool open
file handles, to help OSs which have small open file handle
limits. This work is done in FileMgr. Recently, to support
Windows Unicode path names (the commit you found which breaks
your multithreaded use), we rounded up all remaining native file
IO calls and replaced them to used FileMgr for the IO and then
extended FileMgr to handle Windows Unicode paths in a
Windows-specific manner. One of these changes was in
CURLFTPTransport, which is where you are having the issue. The
problem is that, where previously this class was directly
opening a FILE to do its writing, commit 2760 changed this to
use FileMgr to open the file, which involved the SWORD-wide file
handle pool, and since we are create a new file, we are always
writing to this shared pool container, which is not threadsafe.
My guess is that you have two threads trying to update the pool
container at exactly the same time. Using the file handle pool
is usually safe, because SWMgr "opens" all of its file handles
on initialization (these are not actually opening OS file
handles, but instead updating the file handle pool container
with proxy objects which delay actual OS open to on-demand, but
the point is this instance of shared file handle pool container
writing is done on creation of the SWMgr, afterward, the shared
resource file handle pool is only read and each object in the
pool is owned by only 1 thread if the "each thread must have its
own SWMgr" rule is followed.<br>
</p>
<p>Regardless of the details. I believe I have committed a fix
for you. In short, I have changed CURLFTPTransport to follow
our rule to avoid writing to shared objects when we might be
re-entrant. Here we now use FileMgr's methods which isolate OS
implementation, but not FileMgr's file handle pool (as it did
not previously use the pool before this commit). This should
allow this to still take advantage of the Windows OS-specific
implementation, and also avoid the critical section. Can you
please try SVN head and let me know if we are back to 20 out of
20 successes?</p>
<p>Thanks again for the very helpful debug log and exact revision
where failure began.</p>
<p>Troy<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 10/13/20 10:08 PM, Tobias Klein
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:3258796d-a77a-0009-b0b3-821cda1c89a4@tklein.info">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>I managed to get a backtrace to a segmentation fault using
GDB.</p>
<p>It seems like the crash is happening in sword::FileMgr::open(
...</p>
<p>The starting point is sword::InstallMgr::refreshRemoteSource
as I was writing before.</p>
<p>Best regards,<br>
Tobias<br>
</p>
<p>Program received signal SIGSEGV, Segmentation fault.<br>
[Switching to Thread 0x7f1af3fff700 (LWP 220833)]<br>
0x00007f1b027045a4 in sword::FileMgr::open(char const*, int,
int, bool) () from
/home/tobi/dev/ezra_project/node-sword-interface-git/build/Release/node_sword_interface.node<br>
(gdb) backtrace<br>
#0 0x00007f1b027045a4 in sword::FileMgr::open(char const*,
int, int, bool) () from
/home/tobi/dev/ezra_project/node-sword-interface-git/build/Release/node_sword_interface.node<br>
#1 0x00007f1b0276ad7b in sword::(anonymous
namespace)::my_fwrite(void*, unsigned long, unsigned long,
void*) ()<br>
from
/home/tobi/dev/ezra_project/node-sword-interface-git/build/Release/node_sword_interface.node<br>
#2 0x00007f1b180626bf in ?? () from
/usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4<br>
#3 0x00007f1b18074a2b in ?? () from
/usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4<br>
#4 0x00007f1b1807e2e4 in ?? () from
/usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4<br>
#5 0x00007f1b1807f6f9 in curl_multi_perform () from
/usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4<br>
#6 0x00007f1b18075d13 in curl_easy_perform () from
/usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4<br>
#7 0x00007f1b0276b683 in sword::CURLFTPTransport::getURL(char
const*, char const*, sword::SWBuf*) () from
/home/tobi/dev/ezra_project/node-sword-interface-git/build/Release/node_sword_interface.node<br>
#8 0x00007f1b0271d5d2 in
sword::InstallMgr::remoteCopy(sword::InstallSource*, char
const*, char const*, bool, char const*) ()<br>
from
/home/tobi/dev/ezra_project/node-sword-interface-git/build/Release/node_sword_interface.node<br>
#9 0x00007f1b0271edc7 in
sword::InstallMgr::refreshRemoteSource(sword::InstallSource*)
() from
/home/tobi/dev/ezra_project/node-sword-interface-git/build/Release/node_sword_interface.node<br>
#10 0x00007f1b026ad734 in
RepositoryInterface::refreshIndividualRemoteSource(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::function<void (unsigned int)>*) ()<br>
from
/home/tobi/dev/ezra_project/node-sword-interface-git/build/Release/node_sword_interface.node<br>
#11 0x00007f1b026b17dd in
std::thread::_State_impl<std::thread::_Invoker<std::tuple<int
(RepositoryInterface::*)(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::function<void (unsigned int)>*),
RepositoryInterface*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::function<void (unsigned int)>*> >
>::_M_run() ()<br>
from
/home/tobi/dev/ezra_project/node-sword-interface-git/build/Release/node_sword_interface.node<br>
#12 0x00007f1b1d622cb4 in ?? () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6<br>
#13 0x00007f1b1e20a609 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0<br>
#14 0x00007f1b1e131103 in clone () from
/lib/x86_64-linux-gnu/libc.so.6<br>
</p>
<div class="moz-cite-prefix">On 10/13/20 1:07 PM, Tobias Klein
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:03bca06c-8c98-434a-ff32-3947e285961a@tklein.info">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Hi Troy,</p>
<p>I tested more SVN revisions of SWORD trunk (starting from
my stable version until I hit the bug) and I can now say
that</p>
<p>SVN Rev. 3759 is the last SVN revision that works without
hanging for the below mentioned scenario. (20 out of 20
tests successful)<br>
</p>
<p>SVN Rev. 3760 is the first SVN revision where the hanging
occurs. The commit message is "First cut at better isolation
of FileIO to FileMgr and providing a WIN32 impl with works
with wchar_t".</p>
<p>Modified files:<br>
include/filemgr.h<br>
include/swbuf.h<br>
lib/bcppmake/libsword.bpr<br>
src/mgr/curlftpt.cpp<br>
src/mgr/curlhttpt.cpp<br>
src/mgr/filemgr.cpp<br>
src/mgr/installmgr.cpp<br>
src/mgr/swmgr.cpp<br>
src/utilfuns/utilstr.cpp<br>
<br>
Maybe this helps to find the root-cause.<br>
<br>
Best regards,<br>
Tobias<br>
</p>
<div class="moz-cite-prefix">On 10/12/20 9:20 PM, Tobias Klein
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:fcc4672a-feaf-4eec-9f7c-a0acdc57faf0@tklein.info">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>I'll see whether I can collect a stack trace. It may take
some time until I have it.</p>
<p>The multi-threaded "remote source refreshing" worked
without issues until recently.<br>
</p>
<p>Here is the code of the function that does the actual
work in a thread.<br>
See <a class="moz-txt-link-freetext"
href="https://github.com/tobias-klein/node-sword-interface/blob/787160ccb4b3bab2a762d22f74031c7237edc803/src/sword_backend/repository_interface.cpp#L105"
moz-do-not-send="true">https://github.com/tobias-klein/node-sword-interface/blob/787160ccb4b3bab2a762d22f74031c7237edc803/src/sword_backend/repository_interface.cpp#L105</a>.</p>
<div style="color: #d4d4d4;background-color: #1e1e1e;font-family: 'Droid Sans Mono', 'monospace', monospace, 'Droid Sans Fallback';font-weight: normal;font-size: 14px;line-height: 19px;white-space: pre;"><div><span style="color: #569cd6;">int</span><span style="color: #d4d4d4;"> </span><span style="color: #4ec9b0;">RepositoryInterface</span><span style="color: #d4d4d4;">::</span><span style="color: #dcdcaa;">refreshIndividualRemoteSource</span><span style="color: #d4d4d4;">(</span><span style="color: #4ec9b0;">string</span><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">remoteSourceName</span><span style="color: #d4d4d4;">, </span><span style="color: #4ec9b0;">std</span><span style="color: #d4d4d4;">::</span><span style="color: #4ec9b0;">function</span><span style="color: #d4d4d4;"><</span><span style="color: #569cd6;">void</span><span style="color: #d4d4d4;">(</span><span style="color: #569cd6;">unsigned</span><span style="color: #d4d4d4;"> </span><span style="color: #569cd6;">int</span><span style="color: #d4d4d4;"> </span><span style="color: #4ec9b0;">progress</span><span style="color: #d4d4d4;">)></span><span style="color: #569cd6;">*</span><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">progressCallback</span><span style="color: #d4d4d4;">)</span></div><div><span style="color: #d4d4d4;">{</span></div><div><span style="color: #6a9955;"> //cout << "Refreshing source " << remoteSourceName << endl << flush;</span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #4ec9b0;">InstallSource</span><span style="color: #d4d4d4;">* </span><span style="color: #9cdcfe;">source</span><span style="color: #d4d4d4;"> = </span><span style="color: #569cd6;">this</span><span style="color: #d4d4d4;">-></span><span style="color: #dcdcaa;">getRemoteSource</span><span style="color: #d4d4d4;">(</span><span style="color: #9cdcfe;">remoteSourceName</span><span style="color: #d4d4d4;">);</span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #569cd6;">int</span><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">result</span><span style="color: #d4d4d4;"> = </span><span style="color: #569cd6;">this</span><span style="color: #d4d4d4;">-></span><span style="color: #9cdcfe;">_installMgr</span><span style="color: #d4d4d4;">-></span><span style="color: #dcdcaa;">refreshRemoteSource</span><span style="color: #d4d4d4;">(</span><span style="color: #9cdcfe;">source</span><span style="color: #d4d4d4;">);</span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #c586c0;">if</span><span style="color: #d4d4d4;"> (</span><span style="color: #9cdcfe;">result</span><span style="color: #d4d4d4;"> != </span><span style="color: #b5cea8;">0</span><span style="color: #d4d4d4;">) {</span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">cerr</span><span style="color: #d4d4d4;"> </span><span style="color: #dcdcaa;"><<</span><span style="color: #d4d4d4;"> </span><span style="color: #ce9178;">"Failed to refresh source "</span><span style="color: #d4d4d4;"> </span><span style="color: #dcdcaa;"><<</span><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">remoteSourceName</span><span style="color: #d4d4d4;"> </span><span style="color: #dcdcaa;"><<</span><span style="color: #d4d4d4;"> </span><span style="color: #dcdcaa;">endl</span><span style="color: #d4d4d4;"> </span><span style="color: #dcdcaa;"><<</span><span style="color: #d4d4d4;"> </span><span style="color: #dcdcaa;">flush</span><span style="color: #d4d4d4;">;</span></div><div><span style="color: #d4d4d4;"> }</span></div>
<div><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">remoteSourceUpdateMutex</span><span style="color: #d4d4d4;">.</span><span style="color: #dcdcaa;">lock</span><span style="color: #d4d4d4;">();</span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #569cd6;">this</span><span style="color: #d4d4d4;">-></span><span style="color: #9cdcfe;">_remoteSourceUpdateCount</span><span style="color: #d4d4d4;">++;</span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #569cd6;">unsigned</span><span style="color: #d4d4d4;"> </span><span style="color: #569cd6;">int</span><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">totalPercent</span><span style="color: #d4d4d4;"> = (</span><span style="color: #569cd6;">unsigned</span><span style="color: #d4d4d4;"> </span><span style="color: #569cd6;">int</span><span style="color: #d4d4d4;">)</span><span style="color: #dcdcaa;">calculateIntPercentage</span><span style="color: #d4d4d4;"><</span><span style="color: #569cd6;">double</span><span style="color: #d4d4d4;">>(</span><span style="color: #569cd6;">this</span><span style="color: #d4d4d4;">-></span><span style="color: #9cdcfe;">_remoteSourceUpdateCount</span><span style="color: #d4d4d4;">,</span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #569cd6;">this</span><span style="color: #d4d4d4;">-></span><span style="color: #9cdcfe;">_remoteSourceCount</span><span style="color: #d4d4d4;">);</span></div><div><span style="color: #d4d4d4;"> </span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #c586c0;">if</span><span style="color: #d4d4d4;"> (</span><span style="color: #9cdcfe;">progressCallback</span><span style="color: #d4d4d4;"> != </span><span style="color: #b5cea8;">0</span><span style="color: #d4d4d4;">) {</span></div><div><span style="color: #d4d4d4;"> (*</span><span style="color: #9cdcfe;">progressCallback</span><span style="color: #d4d4d4;">)</span><span style="color: #dcdcaa;">(</span><span style="color: #9cdcfe;">totalPercent</span><span style="color: #dcdcaa;">)</span><span style="color: #d4d4d4;">;</span></div><div><span style="color: #d4d4d4;"> }</span></div><div><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">remoteSourceUpdateMutex</span><span style="color: #d4d4d4;">.</span><span style="color: #dcdcaa;">unlock</span><span style="color: #d4d4d4;">();</span></div>
<div><span style="color: #d4d4d4;"> </span><span style="color: #c586c0;">return</span><span style="color: #d4d4d4;"> </span><span style="color: #9cdcfe;">result</span><span style="color: #d4d4d4;">;</span></div><div><span style="color: #d4d4d4;">}</span></div></div>
<p>Best regards,<br>
Tobias<br>
</p>
<div class="moz-cite-prefix">On 10/12/20 9:01 PM, Troy A.
Griffitts wrote:<br>
</div>
<blockquote type="cite"
cite="mid:36F83DB3-F6C4-4D15-9146-40A6C5B762A0@crosswire.org">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
Any luck getting a stack trace on crash?<br>
<br>
Regarding the "multitheaded mode", I'd have to get a bit
more information as to exactly how you are sharing SWORD
objects across your threads. Generally, as a rule, you
shouldn't. We recommend a separate instance of SWMgr per
thread and that probably goes for InstallMgr, as well.<br>
<br>
Troy<br>
<br>
<div class="gmail_quote">On October 12, 2020 8:29:31 PM
GMT+02:00, Tobias Klein <a
class="moz-txt-link-rfc2396E"
href="mailto:contact@tklein.info"
moz-do-not-send="true"><contact@tklein.info></a>
wrote:
<blockquote class="gmail_quote" style="margin: 0pt 0pt
0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<p>Hi Troy,</p>
<p>I'm using curl on all three platforms.</p>
<p>Regarding the timeout configuration I have not
changed anything yet, to make this configurable in
Ezra Project is still on my todo list.</p>
<p>I just checked on Linux.<br>
With the old version (May 18th 2020) no hanging or
crash in 10 out of 10 times.<br>
WIth the new version (latest trunk / SWORD 1.9 RC3)
I get 1 x crash, 2 x hanging, 7 x working.</p>
<p>I'm running the InstallMgr::refreshRemoteSource "in
a multi-threaded mode".<br>
</p>
<p>Best regards,<br>
Tobias<br>
</p>
<div class="moz-cite-prefix">On 10/12/20 6:59 PM, Troy
A. Griffitts wrote:<br>
</div>
<blockquote type="cite"
cite="mid:E1689B41-6534-4EE4-9267-22BE9F59941E@crosswire.org">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
Hi Tobias,<br>
<br>
What transport library are you building with? ftplib
or curl?<br>
<br>
Have you changed the value of our new timeout from
the default, I believe we decided on, 10 seconds?<br>
<br>
Troy<br>
<br>
<div class="gmail_quote">On October 12, 2020 6:46:54
PM GMT+02:00, Tobias Klein <a
class="moz-txt-link-rfc2396E"
href="mailto:contact@tklein.info"
moz-do-not-send="true"><contact@tklein.info></a>
wrote:
<blockquote class="gmail_quote" style="margin: 0pt
0pt 0pt 0.8ex; border-left: 1px solid rgb(204,
204, 204); padding-left: 1ex;">
<pre class="k9mail">Hi Troy,
In my latest Ezra Project builds using SWORD trunk I’ve been noticing random „hangs“ and crashes related to "updating remote sources“. I suppose it must be around InstallMgr::refreshRemoteSource.
This was still rock solid when using SWORD trunk from May 18th 2020, but not so any more with the recent SWORD trunk.
Unfortunately I cannot pinpoint this more specifically. I just wanted to first share this observation, because it’s worrying me.
I’ve been noticing this regression both on Windows and macOS. Need to check later whether this also happens on Linux, cannot recall it right now.
Best regards,
Tobias<hr>sword-devel mailing list: <a class="moz-txt-link-abbreviated" href="mailto:sword-devel@crosswire.org" moz-do-not-send="true">sword-devel@crosswire.org</a>
<a href="http://crosswire.org/mailman/listinfo/sword-devel" moz-do-not-send="true">http://crosswire.org/mailman/listinfo/sword-devel</a>
Instructions to unsubscribe/change your settings at above page</pre>
</blockquote>
</div>
<br>
-- <br>
Sent from my Android device with K-9 Mail. Please
excuse my brevity. </blockquote>
</blockquote>
</div>
<br>
-- <br>
Sent from my Android device with K-9 Mail. Please excuse
my brevity. </blockquote>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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