It happened again, with lyx 2.2.2, here's some data that was written in my
systemd log:

Dec 17 12:25:30 kulshan lyx.desktop[1192]: Buffer.cpp (1552):
/home/ajd/Documents/research/fpp/LFPPdiscrepancy3.lyx.emergency
Dec 17 12:25:30 kulshan lyx.desktop[1192]: lyx: SIGSEGV signal caught!
Dec 17 12:25:30 kulshan lyx.desktop[1192]: Sorry, you have found a bug in
LyX, hope you have not lost any data.
Dec 17 12:25:30 kulshan lyx.desktop[1192]: Please read the bug-reporting
instructions in 'Help->Introduction' and send us a bug report, if
necessary. Thanks!
Dec 17 12:25:30 kulshan lyx.desktop[1192]: Bye.
Dec 17 12:25:30 kulshan lyx.desktop[1192]: Error: LyX crashed!
Dec 17 12:25:30 kulshan lyx.desktop[1192]:
----------------------------------------
Dec 17 12:25:30 kulshan lyx.desktop[1192]: SIGSEGV signal caught!
Dec 17 12:25:30 kulshan lyx.desktop[1192]: Sorry, you have found a bug in
LyX, hope you have not lost any data.
Dec 17 12:25:30 kulshan lyx.desktop[1192]: Please read the bug-reporting
instructions in 'Help->Introduction' and send us a bug report, if
necessary. Thanks!
Dec 17 12:25:30 kulshan lyx.desktop[1192]: Bye.
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  1) lyx: lyx() [0x8de41f]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  2) lyx: lyx() [0x9406ee]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  3) lyx: lyx() [0x8dd0d0]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  4) lyx: lyx() [0x5b6848]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  5) /usr/lib/libc.so.6:
/usr/lib/libc.so.6(+0x330b0) [0x7f0ec4e3a0b0]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  6) /usr/lib/libc.so.6:
/usr/lib/libc.so.6(+0x1289a4) [0x7f0ec4f2f9a4]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  7) /usr/lib/libQt5Core.so.5:
QByteArray::QByteArray(char const*, int)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  8) lyx: lyx() [0x8ff34c]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: (  9) lyx: lyx() [0x8ffa32]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 10) lyx: lyx() [0x619c44]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 11) lyx: lyx() [0x675c7b]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 12) lyx: lyx() [0x6bdf51]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 13) lyx: lyx() [0x6be5f0]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 14) lyx: lyx() [0x8e3fc8]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 15) lyx: lyx() [0x8e49c8]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 16) lyx: lyx() [0x8e503b]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 17) lyx: lyx() [0x932ecc]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 18)
/usr/lib/libQt5Widgets.so.5: QWidget::event(QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 19)
/usr/lib/libQt5Widgets.so.5: QFrame::event(QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 20)
/usr/lib/libQt5Widgets.so.5: QAbstractScrollArea::event(QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 21) lyx: lyx() [0x934c7d]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 22)
/usr/lib/libQt5Widgets.so.5: QApplicationPrivate::notify_helper(QObject*,
QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 23)
/usr/lib/libQt5Widgets.so.5: QApplication::notify(QObject*, QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 24) lyx: lyx() [0x8ef60c]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 25) /usr/lib/libQt5Core.so.5:
QCoreApplication::notifyInternal2(QObject*, QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 26)
/usr/lib/libQt5Widgets.so.5: /usr/lib/libQt5Widgets.so.5(+0x1b775b)
[0x7f0ec6c2f75b]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 27)
/usr/lib/libQt5Widgets.so.5: QApplicationPrivate::notify_helper(QObject*,
QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 28)
/usr/lib/libQt5Widgets.so.5: QApplication::notify(QObject*, QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 29) lyx: lyx() [0x8ef60c]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 30) /usr/lib/libQt5Core.so.5:
QCoreApplication::notifyInternal2(QObject*, QEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 31) /usr/lib/libQt5Gui.so.5:
QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 32) /usr/lib/libQt5Gui.so.5:
QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 33) /usr/lib/libQt5Gui.so.5:
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 34)
/usr/lib/libQt5XcbQpa.so.5: /usr/lib/libQt5XcbQpa.so.5(+0x70390)
[0x7f0ebbd92390]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 35) /usr/lib/libglib-2.0.so.0:
/usr/lib/libglib-2.0.so.0(g_main_context_dispatch+0x2a7) [0x7f0ec4732587]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 36) /usr/lib/libglib-2.0.so.0:
/usr/lib/libglib-2.0.so.0(+0x4a7f0) [0x7f0ec47327f0]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 37) /usr/lib/libglib-2.0.so.0:
/usr/lib/libglib-2.0.so.0(g_main_context_iteration+0x2c) [0x7f0ec473289c]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 38) /usr/lib/libQt5Core.so.5:
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 39) /usr/lib/libQt5Core.so.5:
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 40) /usr/lib/libQt5Core.so.5:
QCoreApplication::exec()
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 41) lyx: lyx() [0x5bec8d]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 42) lyx: lyx() [0x4674a1]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 43) /usr/lib/libc.so.6:
/usr/lib/libc.so.6(__libc_start_main+0xf1) [0x7f0ec4e27291]
Dec 17 12:25:31 kulshan lyx.desktop[1192]: ( 44) lyx: lyx() [0x47015a]


Dec 17 12:25:57 kulshan systemd-coredump[10495]: Process 1192 (lyx) of user
1000 dumped core.

                                                 Stack trace of thread 1192:
                                                 #0  0x00007f0ec4f2f9a4
__memmove_avx_unaligned_erms (libc.so.6)
                                                 #1  0x00007f0ec5d15730
_ZN10QByteArrayC2EPKci (libQt5Core.so.5)
                                                 #2  0x00000000008ff34c n/a
(lyx)
                                                 #3  0x00000000008ffa32 n/a
(lyx)
                                                 #4  0x0000000000619c44 n/a
(lyx)
                                                 #5  0x0000000000675c7b n/a
(lyx)
                                                 #6  0x0000000000675478 n/a
(lyx)
                                                 #7  0x00000000006bd172 n/a
(lyx)
                                                 #8  0x00000000006bd57e n/a
(lyx)
                                                 #9  0x0000000000935212 n/a
(lyx)
                                                 #10 0x00000000009371dc n/a
(lyx)
                                                 #11 0x00000000008dcbf5 n/a
(lyx)
                                                 #12 0x00000000008dfd6c n/a
(lyx)
                                                 #13 0x00007f0ec5ee938f
_ZN24QAbstractEventDispatcher17filterNativeEventERK10QByteArrayPvPl
(libQt5Core.so.5)
                                                 #14 0x00007f0ebbd5dc14
_ZN14QXcbConnection14handleXcbEventEP19xcb_generic_event_t
(libQt5XcbQpa.so.5)
                                                 #15 0x00007f0ebbd5e8a5
_ZN14QXcbConnection16processXcbEventsEv (libQt5XcbQpa.so.5)
                                                 #16 0x00007f0ec5f184c9
_ZN7QObject5eventEP6QEvent (libQt5Core.so.5)
                                                 #17 0x00007f0ec6bcbe0c
_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent
(libQt5Widgets.so.5)
                                                 #18 0x00007f0ec6bd3581
_ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
                                                 #19 0x00000000008ef60c n/a
(lyx)
                                                 #20 0x00007f0ec5eebdf0
_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
                                                 #21 0x00007f0ec5eee57d
_ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData
(libQt5Core.so.5)
                                                 #22 0x00007f0ec5f40313 n/a
(libQt5Core.so.5)
                                                 #23 0x00007f0ec4732587
g_main_context_dispatch (libglib-2.0.so.0)
                                                 #24 0x00007f0ec47327f0 n/a
(libglib-2.0.so.0)
                                                 #25 0x00007f0ec473289c
g_main_context_iteration (libglib-2.0.so.0)
                                                 #26 0x00007f0ec5f4071f
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5)
                                                 #27 0x00007f0ec5eea24a
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
                                                 #28 0x00007f0ec6db86b7
_ZN7QDialog4execEv (libQt5Widgets.so.5)
                                                 #29 0x0000000000a7dcf0 n/a
(lyx)
                                                 #30 0x0000000000a7e08c n/a
(lyx)
                                                 #31 0x00007f0ec5f17669
_ZN11QMetaObject8activateEP7QObjectiiPPv (libQt5Core.so.5)
                                                 #32 0x0000000000a7c75f n/a
(lyx)
                                                 #33 0x00000000008de347 n/a
(lyx)
                                                 #34 0x00000000009406ee n/a
(lyx)
                                                 #35 0x00000000008dd0d0 n/a
(lyx)
                                                 #36 0x00000000005b6848 n/a
(lyx)
                                                 #37 0x00007f0ec4e3a0b0
__restore_rt (libc.so.6)
                                                 #38 0x00007f0ec4f2f9a4
__memmove_avx_unaligned_erms (libc.so.6)
                                                 #39 0x00007f0ec5d15730
_ZN10QByteArrayC2EPKci (libQt5Core.so.5)
                                                 #40 0x00000000008ff34c n/a
(lyx)
                                                 #41 0x00000000008ffa32 n/a
(lyx)
                                                 #42 0x0000000000619c44 n/a
(lyx)
                                                 #43 0x0000000000675c7b n/a
(lyx)
                                                 #44 0x00000000006bdf51 n/a
(lyx)
                                                 #45 0x00000000006be5f0 n/a
(lyx)
                                                 #46 0x00000000008e3fc8 n/a
(lyx)
                                                 #47 0x00000000008e49c8 n/a
(lyx)
                                                 #48 0x00000000008e503b n/a
(lyx)
                                                 #49 0x0000000000932ecc n/a
(lyx)
                                                 #50 0x00007f0ec6c13647
_ZN7QWidget5eventEP6QEvent (libQt5Widgets.so.5)
                                                 #51 0x00007f0ec6cfa5fe
_ZN6QFrame5eventEP6QEvent (libQt5Widgets.so.5)
                                                 #52 0x00007f0ec6d83363
_ZN19QAbstractScrollArea5eventEP6QEvent (libQt5Widgets.so.5)
                                                 #53 0x0000000000934c7d n/a
(lyx)
                                                 #54 0x00007f0ec6bcbe0c
_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent
(libQt5Widgets.so.5)
                                                 #55 0x00007f0ec6bd4f56
_ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
                                                 #56 0x00000000008ef60c n/a
(lyx)
                                                 #57 0x00007f0ec5eebdf0
_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
                                                 #58 0x00007f0ec6c2f75b n/a
(libQt5Widgets.so.5)
                                                 #59 0x00007f0ec6bcbe0c
_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent
(libQt5Widgets.so.5)
                                                 #60 0x00007f0ec6bd3581
_ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
                                                 #61 0x00000000008ef60c n/a
(lyx)
                                                 #62 0x00007f0ec5eebdf0
_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
                                                 #63 0x00007f0ec6436888
_ZN22QGuiApplicationPrivate15processKeyEventEPN29QWindowSystemInterfacePrivate8KeyEventE
(libQt5Gui.so.5)

                                                 Stack trace of thread 1196:
                                                 #0  0x00007f0ec4ee648d
poll (libc.so.6)
                                                 #1  0x00007f0ec4732786 n/a
(libglib-2.0.so.0)
                                                 #2  0x00007f0ec473289c
g_main_context_iteration (libglib-2.0.so.0)
                                                 #3  0x00007f0ec47328e1 n/a
(libglib-2.0.so.0)
                                                 #4  0x00007f0ec475a0d5 n/a
(libglib-2.0.so.0)
                                                 #5  0x00007f0ec51ac454
start_thread (libpthread.so.0)
                                                 #6  0x00007f0ec4eef7df
__clone (libc.so.6)

                                                 Stack trace of thread 1197:
                                                 #0  0x00007f0ec4ee648d
poll (libc.so.6)
                                                 #1  0x00007f0ec4732786 n/a
(libglib-2.0.so.0)
                                                 #2  0x00007f0ec4732b12
g_main_loop_run (libglib-2.0.so.0)
                                                 #3  0x00007f0eb822b316 n/a
(libgio-2.0.so.0)
                                                 #4  0x00007f0ec475a0d5 n/a
(libglib-2.0.so.0)
                                                 #5  0x00007f0ec51ac454
start_thread (libpthread.so.0)
                                                 #6  0x00007f0ec4eef7df
__clone (libc.so.6)

                                                 Stack trace of thread 1195:
                                                 #0  0x00007f0ec4ee648d
poll (libc.so.6)
                                                 #1  0x00007f0ec4732786 n/a
(libglib-2.0.so.0)
                                                 #2  0x00007f0ec473289c
g_main_context_iteration (libglib-2.0.so.0)
                                                 #3  0x00007f0eaf6804bd n/a
(libdconfsettings.so)
                                                 #4  0x00007f0ec475a0d5 n/a
(libglib-2.0.so.0)
                                                 #5  0x00007f0ec51ac454
start_thread (libpthread.so.0)
                                                 #6  0x00007f0ec4eef7df
__clone (libc.so.6)

                                                 Stack trace of thread 1194:
                                                 #0  0x00007f0ec4ee648d
poll (libc.so.6)
                                                 #1  0x00007f0ec120c8e0 n/a
(libxcb.so.1)
                                                 #2  0x00007f0ec120e679
xcb_wait_for_event (libxcb.so.1)
                                                 #3  0x00007f0ebbd5c449 n/a
(libQt5XcbQpa.so.5)
                                                 #4  0x00007f0ec5d11d78 n/a
(libQt5Core.so.5)
                                                 #5  0x00007f0ec51ac454
start_thread (libpthread.so.0)
                                                 #6  0x00007f0ec4eef7df
__clone (libc.so.6)

                                                 Stack trace of thread 1198:
                                                 #0  0x00007f0ec4ee648d
poll (libc.so.6)
                                                 #1  0x00007f0ec4732786 n/a
(libglib-2.0.so.0)
                                                 #2  0x00007f0ec473289c
g_main_context_iteration (libglib-2.0.so.0)
                                                 #3  0x00007f0ec5f4071f
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5)
                                                 #4  0x00007f0ec5eea24a
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
                                                 #5  0x00007f0ec5d0d0f3
_ZN7QThread4execEv (libQt5Core.so.5)
                                                 #6  0x00007f0eb9b9de55 n/a
(libQt5DBus.so.5)
                                                 #7  0x00007f0ec5d11d78 n/a
(libQt5Core.so.5)
                                                 #8  0x00007f0ec51ac454
start_thread (libpthread.so.0)
                                                 #9  0x00007f0ec4eef7df
__clone (libc.so.6)


On Fri, Mar 25, 2016 at 8:52 PM, LyX Ticket Tracker <t...@lyx.org> wrote:

> #10042: LyX crashes in conjunction with find-and-replace
> ---------------------+-------------------------
>  Reporter:  ajd      |       Owner:  lasgouttes
>      Type:  defect   |      Status:  new
>  Priority:  normal   |   Milestone:
> Component:  general  |     Version:  2.1.4
>  Severity:  normal   |  Resolution:
>  Keywords:           |
> ---------------------+-------------------------
>
> Comment (by skostysh):
>
>  Or if you don't run GDB, if you are interested in testing 2.2beta2
>  compiled in development mode, I think that the backtrace is written to the
>  terminal automatically. It is the case for me, but I'm not sure which
>  settings it depends on.
>
> --
> Ticket URL: <http://www.lyx.org/trac/ticket/10042#comment:3>
> The LyX Project <http://www.lyx.org/>
> LyX -- The Document Processor
>

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