crash during calling pollTimer slot function by QTimer trigger

I have embedded linux environment and sometimes during stress testing we are getting crash with following backtrace:

PC: /usr/lib/libQt5Network.so.5(_ZN35QNetworkConfigurationManagerPrivate11pollEnginesEv+0x9c)
LR: /usr/lib/libQt5Network.so.5(_ZN35QNetworkConfigurationManagerPrivate11pollEnginesEv+0x30)

Backtrace:
/usr/lib/libQt5Network.so.5(_ZN35QNetworkConfigurationManagerPrivate11pollEnginesEv+0x9c)
/usr/lib/libQt5Network.so.5(+0xf53b0)
/usr/lib/libQt5Core.so.5(_ZN11QMetaObject8activateEP7QObjectiiPPv+0x728)
/usr/lib/libQt5Core.so.5(_ZN6QTimer10timerEventEP11QTimerEvent+0x30)
/usr/lib/libQt5Core.so.5(_ZN7QObject5eventEP6QEvent+0x164)
/usr/lib/libQt5Core.so.5(_ZN23QCoreApplicationPrivate13notify_helperEP7QObjectP6QEvent+0x50)
/usr/lib/libQt5Core.so.5(_ZN16QCoreApplication6notifyEP7QObjectP6QEvent+0x54)
/usr/lib/libQt5Core.so.5(_ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent+0x74)
/usr/lib/libQt5Core.so.5(_ZN14QTimerInfoList14activateTimersEv+0x5a8)
/usr/lib/libQt5Core.so.5(+0x27e854)
/usr/lib/libglib-2.0.so.0(g_main_context_dispatch+0x130)
/usr/lib/libglib-2.0.so.0(+0x45fac)
/usr/lib/libglib-2.0.so.0(g_main_context_iteration+0x2c)
/usr/lib/libQt5Core.so.5(_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE+0x60)
/usr/lib/libQt5Core.so.5(_ZN10QEventLoop13processEventsE6QFlagsINS_17ProcessEventsFlagEE+0x24)
/usr/lib/libQt5Core.so.5(_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE+0x14c)
/usr/lib/libQt5Core.so.5(_ZN7QThread4execEv+0x80)
/usr/lib/libQt5Core.so.5(+0x793a0)
/lib/libpthread.so.0(+0x6e64)
/lib/libc.so.6(+0xccc30)