Description:
------
webkit2gtk 2.20 adds a new security feature called the Gigacage that uses an extremely large virtual memory address space (much larger than available physical memory).

Deja Dup's monitor background service had "ulimit -v 1000000" (that's 1 GB) set as a workaround for a memory leak issue that the developer was unable to reproduce.

After upgrading to the new webkit2gtk version, Deja Dup's monitor service will crash because of that virtual memory limit.

Additional info:
* deja-dup 36.3-3
* config and/or log files etc.:
Mär 28 14:25:48 ThinkPad.fritz.box systemd-coredump[27722]: Process 27680 (deja-dup-monito) of user 1001 dumped core.

Stack trace of thread 27680:
#0 0x00007f2745d56f24 n/a (libjavascriptcoregtk-4.0.so.18)
#1 0x00007f274a4c8def __pthread_once_slow (libpthread.so.0)
#2 0x00007f2745d565ee _ZN8Gigacage14ensureGigacageEv (libjavascriptcoregtk-4.0.so.18)
#3 0x00007f2745d5792e _ZN7bmalloc4HeapC1ENS_8HeapKindERSt10lock_guardINS_11StaticMutexEE (libjavascriptcoregtk-4.0.so.18)
#4 0x00007f2745d55022 _ZN7bmalloc10PerProcessINS_11PerHeapKindINS_4HeapEEEE11getSlowCaseEv (libjavascriptcoregtk-4.0.so.18)
#5 0x00007f2745d54685 _ZN7bmalloc5CacheC2ENS_8HeapKindE (libjavascriptcoregtk-4.0.so.18)
#6 0x00007f2745d54aba _ZN7bmalloc5Cache25allocateSlowCaseNullCacheENS_8HeapKindEm (libjavascriptcoregtk-4.0.so.18)
#7 0x00007f2745d2ee37 _ZN3WTF10StringImpl17createFromLiteralEPKcj (libjavascriptcoregtk-4.0.so.18)
#8 0x00007f2745d2eec3 _ZN3WTF10StringImpl17createFromLiteralEPKc (libjavascriptcoregtk-4.0.so.18)
#9 0x00007f2745d40ce1 _ZN3WTF6StringC2ENS_12ASCIILiteralE (libjavascriptcoregtk-4.0.so.18)
#10 0x00007f274651d598 n/a (libwebkit2gtk-4.0.so.37)
#11 0x00007f274b23c47a call_init.part.0 (ld-linux-x86-64.so.2)
#12 0x00007f274b23c586 _dl_init (ld-linux-x86-64.so.2)
#13 0x00007f274b22df6a _dl_start_user (ld-linux-x86-64.so.2)
-- Subject: Speicherabbild für Prozess 27680 (@COREDUMP_COMM) generiert
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Documentation: man:core(5)
--
-- Prozess 27680 (deja-dup-monito) ist abgebrochen worden und
-- ein Speicherabbild wurde generiert.
--
-- Üblicherweise ist dies ein Hinweis auf einen Programmfehler und sollte
-- als Fehler dem jeweiligen Hersteller gemeldet werden.

There is a fix on the DejaDup-Launchpad:
https://bugs.launchpad.net/deja-dup/+bug/1751460



Steps to reproduce:
Test Case
---------
Install the deja-dup
Install the webkit2gtk
Log out. Log in.
After a few minutes, check 'journalctl -p 0..3 -xn' for any Deja Dup crash reports.