Crash while unlock screen dialog
This happened maybe 5 times in 3 months. After a period of inactivity you move the mouse or press a key to use your computer again. The unlock screen password prompt appears, you normally fill this in. However if instead of filling in the password I type Esc in a quick succession (or other keys) this will make the password dialog dissapear/reappear and eventually I get a crash. It's unpleasant since this brings down Lightdm and all apps you have running.
Arch Linux, gnome-flashback 3.42.1-2
Process 1008 (gnome-flashback) of user 1000 dumped core.
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Stack trace of thread 132099:
#0 0x00007f9d61c9f34c __pthread_kill_implementation (libc.so.6 + 0x8f34c)
#1 0x00007f9d61c524b8 raise (libc.so.6 + 0x424b8)
#2 0x00007f9d61c3c534 abort (libc.so.6 + 0x2c534)
#3 0x00007f9d61e4e064 n/a (libglib-2.0.so.0 + 0x1d064)
#4 0x00007f9d61eabfd1 g_assertion_message_expr (libglib-2.0.so.0 + 0x7afd1)
#5 0x0000564f7c4be2b8 n/a (gnome-flashback + 0x812b8)
#6 0x00007f9d61e27d65 pam_vprompt (libpam.so.0 + 0x8d65)
#7 0x00007f9d61e27fbb pam_prompt (libpam.so.0 + 0x8fbb)
#8 0x00007f9d503c90cc pam_sm_authenticate (pam_faillock.so + 0x30cc)
#9 0x00007f9d61e2291a n/a (libpam.so.0 + 0x391a)
#10 0x00007f9d61e22181 pam_authenticate (libpam.so.0 + 0x3181)
#11 0x0000564f7c4be554 n/a (gnome-flashback + 0x81554)
#12 0x00007f9d62070c13 n/a (libgio-2.0.so.0 + 0xa7c13)
#13 0x00007f9d61eb87e7 n/a (libglib-2.0.so.0 + 0x877e7)
#14 0x00007f9d61eb5815 n/a (libglib-2.0.so.0 + 0x84815)
#15 0x00007f9d61c9d5c2 start_thread (libc.so.6 + 0x8d5c2)
#16 0x00007f9d61d22584 __clone (libc.so.6 + 0x112584)