Package: x2goclient Version: 4.1.1.1

This seems to be a new issue with 4.1.1.1.

On EL7.4:

Program terminated with signal 11, Segmentation fault. #0 0x00007fdec5cb2d7b in ssh_poll_set_events (p=0x7fdea400c0c0, events=4) at /usr/src/debug/libssh-0.7.1/src/poll.c:349 349 p->ctx->pollfds[p->x.idx].events = events; gdb) thr app all bt

Thread 3 (Thread 0x7fdeaa1b7700 (LWP 15963)): #0 0x00007fdec340fa3d in poll () at ../sysdeps/unix/syscall-template.S:81 #1 0x00007fdec42d0dc8 in qt_safe_poll(pollfd*, int, int, bool) (__timeout=-1, __nfds=1, __fds=0x7fdeaa1b6d20) at /usr/include/bits/poll2.h:46 #2 0x00007fdec42d0dc8 in qt_safe_poll(pollfd*, int, int, bool) (fds=fds@entry=0x7fdeaa1b6d20, nfds=nfds@entry=1, timeout_ms=timeout_ms@entry=-1, retry_eintr=retry_eintr@entry=false) at kernel/qcore_unix.cpp:121 #3 0x00007fdec4280c88 in QProcessManager::run() (this= 0x7fdec460b520 <processManager()::processManager>) at io/qprocess_unix.cpp:240 #4 0x00007fdec419d11f in QThreadPrivate::start(void*) (arg=0x7fdec460b520 <processManager()::processManager>) at thread/qthread_unix.cpp:338 #5 0x00007fdec3f0ce25 in start_thread (arg=0x7fdeaa1b7700) at pthread_create.c:308 #6 0x00007fdec341a34d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7fdec6ae58c0 (LWP 15927)): #0 0x00007fdec340fa3d in poll () at ../sysdeps/unix/syscall-template.S:81 #1 0x00007fdebfb277ac in g_main_context_iterate.isra.21 () at /lib64/libglib-2.0.so.0 #2 0x00007fdebfb278cc in g_main_context_iteration () at /lib64/libglib-2.0.so.0 #3 0x00007fdec42d35d5 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0xbdd630, flags=...) at kernel/qeventdispatcher_glib.cpp:425 #4 0x00007fdec4bbcb26 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:207 #5 0x00007fdec42a365f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffca4e35600, flags=...) at kernel/qeventloop.cpp:149 #6 0x00007fdec42a39ad in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffca4e35600, flags=...) at kernel/qeventloop.cpp:204 #7 0x00007fdec42a8eb9 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1221 #8 0x00007fdec4b1922c in QApplication::exec() () at kernel/qapplication.cpp:3826 #9 0x000000000050d1d1 in x2goMain(int, char**) (argc=1, argv=<optimized out>) at ../src/ongetpass.cpp:114 #10 0x000000000053d53e in fork_helper(int, char**) (argv=0x7ffca4e359e8, argc=1) at ../src/x2goclient.cpp:36 #11 0x000000000053d53e in fork_helper(int, char**) (argc=argc@entry=1, argv=argv@entry=0x7ffca4e359e8) at ../src/x2goclient.cpp:89 #12 0x000000000041d60e in main(int, char**) (argc=1, argv=0x7ffca4e359e8) at ../src/x2goclient.cpp:123

Thread 1 (Thread 0x7fdeaa9b8700 (LWP 15934)): #0 0x00007fdec5cb2d7b in ssh_poll_set_events (p=0x7fdea400c0c0, events=4) at /usr/src/debug/libssh-0.7.1/src/poll.c:349 #1 0x00007fdec5cb62eb in ssh_socket_nonblocking_flush (len=<optimized out>, buffer=<optimized out>, s=0x7fdea40038e0) at /usr/src/debug/libssh-0.7.1/src/socket.c:568 #2 0x00007fdec5cb62eb in ssh_socket_nonblocking_flush (s=s@entry=0x7fdea40038e0) at /usr/src/debug/libssh-0.7.1/src/socket.c:661 #3 0x00007fdec5cb63d4 in ssh_socket_write (s=0x7fdea40038e0, buffer=<optimized out>, len=len@entry=52) at /usr/src/debug/libssh-0.7.1/src/socket.c:622 #4 0x00007fdec5cad5ff in packet_send2 (session=0x7fdea4002f90, session=0x7fdea4002f90) at /usr/src/debug/libssh-0.7.1/src/packet.c:509 #5 0x00007fdec5cad5ff in packet_send2 (session=session@entry=0x7fdea4002f90) at /usr/src/debug/libssh-0.7.1/src/packet.c:579 #6 0x00007fdec5cadfe5 in packet_send (session=session@entry=0x7fdea4002f90) at /usr/src/debug/libssh-0.7.1/src/packet.c:604 #7 0x00007fdec5c9c16a in channel_write_common (channel=0x7fdea400e5b0, data=0x7fdeaa937b20, len=9, is_stderr=0) at /usr/src/debug/libssh-0.7.1/src/channels.c:1321 #8 0x00000000004d6f11 in SshMasterConnection::channelLoop() (this=this@entry=0xf97710) at ../src/sshmasterconnection.cpp:2320 #9 0x00000000004da13d in SshMasterConnection::run() (this=0xf97710) at ../src/sshmasterconnection.cpp:791 #10 0x00007fdec419d11f in QThreadPrivate::start(void*) (arg=0xf97710) at thread/qthread_unix.cpp:338 #11 0x00007fdec3f0ce25 in start_thread (arg=0x7fdeaa9b8700) at pthread_create.c:308 #12 0x00007fdec341a34d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

(gdb) print *p->ctx $3 = {pollptrs = 0x0, pollfds = 0x45, polls_allocated = 140594210989168, polls_used = 0, chunk_size = 15}

so pollfds is not valid.

Happens with certain users/certain configs. Seen on EL7 and Fedora 27 though with different call stacks.

Fedora 27 - https://bugzilla.redhat.com/show_bug.cgi?id=1562168

-- Orion Poplawski Manager of NWRA Technical Systems 720-772-5637 NWRA, Boulder/CoRA Office FAX: 303-415-9702 3380 Mitchell Lane orion@nwra.com Boulder, CO 80301 https://www.nwra.com/