[ktorrent] [Bug 523761] libktorrent segfault on authenticationFinished

https://bugs.kde.org/show_bug.cgi?id=523761

--- Comment #3 from [email protected] ---
I made the following changes over e5636364de1642f222528c3e16b849b55843ce70 and
got some interesting outputs over 2 days...

```
diff --git a/src/peer/peerconnector.cpp b/src/peer/peerconnector.cpp
index c1b41258..a514beeb 100644
--- a/src/peer/peerconnector.cpp
+++ b/src/peer/peerconnector.cpp
@@ -4,6 +4,7 @@
     SPDX-License-Identifier: GPL-2.0-or-later
 */

+#include <QDebug>
 #include "peerconnector.h"
 #include "authenticationmonitor.h"
 #include "peermanager.h"
@@ -34,6 +35,7 @@ public:

     ~Private()
     {
+   qDebug () << QDateTime::currentDateTime () << "deleting
PeerConnector::Private " << this << " of PeerConnector: " << p;
         if (auth.data()) {
             stopping = true;
             auth.data()->stop();
@@ -61,10 +63,12 @@ PeerConnector::PeerConnector(const net::Address &addr, bool
local, bt::PeerManag
     : Resource(&half_open_connections,
pman.getTorrent().getInfoHash().toString())
     , d(std::make_unique<Private>(this, addr, local, pman, std::move(token)))
 {
+   qDebug () << QDateTime::currentDateTime () << "creating PeerConnector: " <<
this << " Private: " << d.get ();
 }

 PeerConnector::~PeerConnector()
 {
+   qDebug () << QDateTime::currentDateTime () << "deleting PeerConnector: " <<
this;
 }

 void PeerConnector::setMaxActive(Uint32 mc)
@@ -105,6 +109,7 @@ void PeerConnector::acquired()

 void PeerConnector::authenticationFinished(Authenticate *auth, bool ok)
 {
+   qDebug () << QDateTime::currentDateTime () << "using PeerConnector::Private
" << d.get () << "of PeerConnector" << this;
     d->authenticationFinished(auth, ok);
 }

```

SAMPLES
The whole outputs are in MBs, so I'll spare you the effort and just give the
part right before the crash.

1.
QDateTime(2026-08-07 00:58:00.056 IST Qt::LocalTime) creating PeerConnector: 
0x557d77e3fb80  Private:  0x557d77e3fbc0
...
QDateTime(2026-08-07 00:58:07.047 IST Qt::LocalTime) using
PeerConnector::Private  0x557d77e3fbc0 of PeerConnector 0x557d77e3fb80
QDateTime(2026-08-07 00:58:07.047 IST Qt::LocalTime) deleting PeerConnector: 
0x557d77e3fb80
QDateTime(2026-08-07 00:58:07.047 IST Qt::LocalTime) deleting
PeerConnector::Private  0x557d77e3fbc0  of PeerConnector:  0x557d77e3fb80
QDateTime(2026-08-07 00:58:07.047 IST Qt::LocalTime) using
PeerConnector::Private  0x740020006e006f of PeerConnector 0x557d77e3fb80
KCrash: Application 'ktorrent' crashing... crashRecursionCounter = 2
./run.sh: line 10: 115433 Segmentation fault         (core dumped) bin/ktorrent
--verbose

✘ SEGV  16m 47s 

2.
QDateTime(2026-08-07 00:40:41.035 IST Qt::LocalTime) creating PeerConnector: 
0x556819b22eb0  Private:  0x556815de3cd0
...
QDateTime(2026-08-07 00:40:48.026 IST Qt::LocalTime) using
PeerConnector::Private  0x556815de3cd0 of PeerConnector 0x556819b22eb0
QDateTime(2026-08-07 00:40:48.026 IST Qt::LocalTime) deleting PeerConnector: 
0x556819b22eb0
QDateTime(2026-08-07 00:40:48.026 IST Qt::LocalTime) deleting
PeerConnector::Private  0x556815de3cd0  of PeerConnector:  0x556819b22eb0
QDateTime(2026-08-07 00:40:48.026 IST Qt::LocalTime) using
PeerConnector::Private  0x740020006e006f of PeerConnector 0x556819b22eb0
KCrash: Application 'ktorrent' crashing... crashRecursionCounter = 2
./run.sh: line 10: 93251 Segmentation fault         (core dumped) bin/ktorrent
--verbose

✘ SEGV  17m 26s

3.
QDateTime(2026-08-06 10:12:58.062 IST Qt::LocalTime) creating PeerConnector: 
0x55e08e3449d0  Private:  0x55e08ca6a570
...
QDateTime(2026-08-06 10:13:05.052 IST Qt::LocalTime) using
PeerConnector::Private  0x55e08ca6a570 of PeerConnector 0x55e08e3449d0
QDateTime(2026-08-06 10:13:05.052 IST Qt::LocalTime) deleting PeerConnector: 
0x55e08e3449d0
QDateTime(2026-08-06 10:13:05.052 IST Qt::LocalTime) deleting
PeerConnector::Private  0x55e08ca6a570  of PeerConnector:  0x55e08e3449d0
QDateTime(2026-08-06 10:13:05.052 IST Qt::LocalTime) using
PeerConnector::Private  0x0 of PeerConnector 0x55e08e3449d0
KCrash: Application 'ktorrent' crashing... crashRecursionCounter = 2
./run.sh: line 10: 2072844 Segmentation fault         (core dumped)
bin/ktorrent --verbose

✘ SEGV  12m 40s

___

Do note that I have built (and run) this with kconfig 6.28.0-1 and kcoreaddons
6.28.0-1 , so in case you think that the problem might be with the version,
then feel free to ignore this. I will consider using kdesrc-build/kde-builder
in case this might be the reason.

This is indeed weird, though.
I will try reverting bae6085261a6c1571a880ae1e053746270af6b8d and
d6dec56102cd26ba837fe6f5e5956170eaf97b0d and come back with any interesting
results.

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