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[Bug-gnuzilla] IceCat-38.8.0 does not work on Fedora 24

From: Antonio Trande
Subject: [Bug-gnuzilla] IceCat-38.8.0 does not work on Fedora 24
Date: Sat, 25 Jun 2016 22:39:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1

Hi all,

currently IceCat-38.8.0 does not work on Fedora 24; we have open a
related bug report:

Crash report from GDB:

0x00007ffff4873bb3 in nsLayoutUtils::GetLastSibling
(aFrame=0xe5e5e5e5e5e5e5e5) at
1586      if (!aFrame) {

That's the code where the crash happens:
// static
nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) {
  if (!aFrame) {
    return nullptr;

  nsIFrame* next;
  while ((next = aFrame->GetNextSibling()) != nullptr) {
    aFrame = next;
  return aFrame;

It looks lke icecat crashes, because it tries to access uninitialised
memory (0xe5e5e5e5e5e5e5e5) and checks the memory against NULL
(!aFrame), that must crash.
But I don't know the cause might be gcc6 related.

Any help is welcome.

Antonio Trande
mailto: sagitter 'at' fedoraproject 'dot' org
GPG Key: 0x6CE6D08A
Check on https://keys.fedoraproject.org/

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