npviewer.bin exited on signal 6 (core dumped) with www/linux-flashplayer

I don't know whether it's specific to www/linux-flashplayer, but whenever the plug-in loads (in Waterfox or Firefox) there's a dump.

This morning, for example (from dmesg, after a few visits to <https://helpx.adobe.com/flash-player.html>):

pid 34576 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 35395 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 36304 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 36316 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 36359 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 36371 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 36401 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 36414 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 36446 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)
pid 36459 (npviewer.bin), uid 1004: exited on signal 6 (core dumped)

Should I raise a bug against www/linux-flashplayer, or against something else?

----

For one of the exits, with Firefox run in safe mode at the command line:

*** NSPlugin Viewer  *** WARNING: grmpf, despite much effort, I could not determine the actual plugin area size...
Fontconfig warning: "/usr/local/etc/fonts/local.conf", line 1093: saw number, expected matrix
*** glibc detected *** /usr/local/lib/nspluginwrapper/i386/linux/npviewer.bin: free(): invalid next size (fast): 0x08104998 ***
======= Backtrace: =========
/lib/libc.so.6(+0x70bb1)[0x289afbb1]
/lib/libc.so.6(+0x73611)[0x289b2611]
/lib/libstdc++.so.6(_ZdlPv+0x22)[0x2a346df2]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x5951a4)[0x297951a4]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x55e75b)[0x2975e75b]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x55e59c)[0x2975e59c]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x389698)[0x29589698]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x4d499f)[0x296d499f]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x548ab1)[0x29748ab1]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x38448a)[0x2958448a]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x54914c)[0x2974914c]
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so(+0x54fcba)[0x2974fcba]
/usr/local/lib/nspluginwrapper/i386/linux/npviewer.bin[0x8051a1d]
/usr/local/lib/nspluginwrapper/i386/linux/npviewer.bin[0x805a335]
/usr/local/lib/nspluginwrapper/i386/linux/npviewer.bin[0x805ab90]
/usr/local/lib/nspluginwrapper/i386/linux/npviewer.bin[0x8050e32]
/lib/libc.so.6(__libc_start_main+0xe6)[0x28955d26]
/usr/local/lib/nspluginwrapper/i386/linux/npviewer.bin[0x804b311]
======= Memory map: ========
08048000-0806c000 r-xp 00026000 00:00 306218     /usr/local/lib/nspluginwrapper/i386/linux/npviewer.bin
0806c000-080f7000 rw-p 0008b000 00:00 0
080f7000-08127000 rw-p 00030000 00:00 0
2806c000-2808b000 r-xp 00024000 00:00 1874517     /compat/linux/usr/lib/ld-2.12.so
2808b000-2808c000 r--p 00024000 00:00 1874517     /compat/linux/usr/lib/ld-2.12.so
2808c000-2808e000 rw-p 00002000 00:00 0
2808e000-2808f000 r--p 05e98000 00:00 1874710     /compat/linux/usr/lib/locale/locale-archive
2808f000-28090000 r--p 00001000 00:00 1876252     /compat/linux/usr/share/locale/en_GB/LC_MESSAGES/libc.mo
28090000-28095000 r--p 00005000 00:00 499790     /compat/linux/usr/share/locale/en_GB/LC_MESSAGES/gdk-pixbuf.mo
28095000-28096000 rw-p 00001000 00:00 0
28096000-2814e000 r-xp 000bb000 00:00 709315     /compat/linux/usr/lib/libgdk-x11-2.0.so.0.2400.23
2814e000-28151000 rw-p 000bb000 00:00 709315     /compat/linux/usr/lib/libgdk-x11-2.0.so.0.2400.23
28151000-2819c000 r-xp 0004c000 00:00 1874593     /compat/linux/usr/lib/libgobject-2.0.so.0.2800.8
2819c000-2819d000 rw-p 0004c000 00:00 1874593     /compat/linux/usr/lib/libgobject-2.0.so.0.2800.8
2819d000-2819e000 rw-p 00001000 00:00 0
2819e000-281a2000 r-xp 00004000 00:00 1874601     /compat/linux/usr/lib/libgthread-2.0.so.0.2800.8
281a2000-281a3000 rw-p 00004000 00:00 1874601     /compat/linux/usr/lib/libgthread-2.0.so.0.2800.8
281a3000-281a4000 rw-p 00001000 00:00 0
281a4000-281fc000 r-xp 0005b000 00:00 6748     /compat/linux/usr/lib/libXt.so.6.0.0
281fc000-28200000 rw-p 0005b000 00:00 6748     /compat/linux/usr/lib/libXt.so.6.0.0
28200000-286a2000 r-xp 004a8000 00:00 709317     /compat/linux/usr/lib/libgtk-x11-2.0.so.0.2400.23
286a2000-286a8000 rw-p 004a8000 00:00 709317     /compat/linux/usr/lib/libgtk-x11-2.0.so.0.2400.23
286a8000-286a9000 rw-p 00001000 00:00 0
286a9000-287c5000 r-xp 0011d000 00:00 1874583     /compat/linux/usr/lib/libglib-2.0.so.0.2800.8
287c5000-287c6000 rw-p 0011d000 00:00 187*** NSPlugin Wrapper *** ERROR: NPP_Destroy() wait for reply: Connection closed
*** NSPlugin Wrapper *** ERROR: NPObject proxy 0x80a204860 is no longer valid!
JavaScript error: https://d9.flashtalking.com/d9core, line 1: SecurityError: The operation is insecure.