group.of.nepali.translators team mailing list archive

[Jeremy Bicha <jeremy@xxxxxxxxx>]

I am closing the webkit2gtk part of this bug.

It was mentioned that someone might set a virtual memory limit for their
entire system. I don't think setting that makes sense on a desktop and
it's my understanding that doing so will also break Java apps for a
similar reason.

To test the impact of this, I added this to my ~/.profile

ulimit -v 4000000

After logging out and logging back in, I was still able to run GNOME
Shell (although presumably the Captive Portal feature won't work). Any
webkit using apps won't work (and that includes Epiphany, gnome-control-
center, evolution, etc.).

At least the systemd journal records this basic error message:

org.gnome.Epiphany.desktop[12949]: FATAL: Could not allocate gigacage
memory with maxAlignment = 34359738368, totalSize = 103079215104.

.

The next upstream release of webkit2gtk will also add this to that error
message: "Make sure you have not set a virtual memory limit."

So the remaining task here is to provide a deja-dup update to all
supported Ubuntu releases so that we can safely provide webkit2gtk
security updates there.

** No longer affects: webkit2gtk (Ubuntu Bionic)

** Changed in: webkit2gtk (Ubuntu)
       Status: Triaged => Invalid

** No longer affects: webkit2gtk (Ubuntu Xenial)

** No longer affects: webkit2gtk (Ubuntu Artful)

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https://bugs.launchpad.net/bugs/1751460

Title:
  [regression] deja-dup-monitor crashed with SIGSEGV in
  Gigacage::<lambda()>::operator()

Status in Déjà Dup:
  New
Status in WebKit:
  Fix Released
Status in deja-dup package in Ubuntu:
  Fix Released
Status in webkit2gtk package in Ubuntu:
  Invalid
Status in deja-dup source package in Xenial:
  Triaged
Status in deja-dup source package in Artful:
  Triaged
Status in deja-dup source package in Bionic:
  Fix Released

Bug description:
  Impact
  ------
  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.

  Test Case
  ---------
  Install the deja-dup update.
  Install the webkit2gtk update from a PPA (not prepared yet).
  Log out. Log in.
  After a few minutes, check /var/crash/ for any Deja Dup crash reports.

  Regression Potential
  --------------------
  This could reintroduce the memory leak bug, but otherwise this is a minimal fix. Even if that happens, it's better than the service refusing to run.

  Other Info
  ----------
  https://errors.ubuntu.com/problem/27441b78823246dd5392ee29ac30546f6464289e

  ProblemType: Crash
  DistroRelease: Ubuntu 18.04
  Package: deja-dup 37.1-1fakesync1
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: GNOME
  Date: Sat Feb 24 14:30:47 2018
  ExecutablePath: /usr/lib/deja-dup/deja-dup-monitor
  InstallationDate: Installed on 2017-12-27 (59 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  ProcCmdline: /usr/lib/deja-dup/deja-dup-monitor
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7ff1c3dda588:	movl   $0x0,(%rax)
   PC (0x7ff1c3dda588) ok
   source "$0x0" ok
   destination "(%rax)" (0xbbadbeef) not located in a known VMA region (needed writable region)!
  SegvReason: writing unknown VMA
  Signal: 11
  SourcePackage: deja-dup
  StacktraceTop:
   ?? () from /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18
   __pthread_once_slow (once_control=0x7ff1c404202c, init_routine=0x7ff1baec0490 <__once_proxy>) at pthread_once.c:116
   Gigacage::ensureGigacage() () from /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18
   bmalloc::Heap::Heap(bmalloc::HeapKind, std::lock_guard<bmalloc::StaticMutex>&) () from /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18
   bmalloc::PerProcess<bmalloc::PerHeapKind<bmalloc::Heap> >::getSlowCase() () from /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18
  Title: deja-dup-monitor crashed with SIGSEGV in __pthread_once_slow()
  UpgradeStatus: Upgraded to bionic on 2018-02-24 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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