[Bug 1850529] Re: Crash after update to 71.0~b5+build1-0ubuntu0.16.04.1

Tue Nov 12 11:15:27 UTC 2019

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On 2019-11-07T11:04:38+00:00 Mats-l wrote:

Starting it under gdb shows that it crashes due to infinite recursion
copying a string:

(gdb) bt
#0  0x00007fffe443ab5d in mozilla::detail::nsTStringRepr<char>::nsTStringRepr(char*, unsigned int, mozilla::detail::StringDataFlags, mozilla::detail::StringClassFlags) (this=<optimized out>, aData=0x7fffea2099c4 <gNullChar> "", aLength=0, aDataFlags=mozilla::detail::StringDataFlags::TERMINATED, aClassFlags=mozilla::detail::StringClassFlags::NULL_TERMINATED) at xpcom/string/nsTStringRepr.h:322
#1  0x00007fffe443ab5d in nsTSubstring<char>::nsTSubstring(mozilla::detail::StringClassFlags) (this=<optimized out>, aClassFlags=mozilla::detail::StringClassFlags::NULL_TERMINATED) at xpcom/string/nsTSubstring.h:1142
#2  0x00007fffe443ab5d in nsTString<char>::nsTString(nsTSubstringTuple<char> const&) (this=<optimized out>, aTuple=...) at xpcom/string/nsTString.h:95
#3  0x00007fffe443ab5d in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&, std::nothrow_t const&) (this=0x7fffdf6bf040, aTuple=..., aFallible=...) at xpcom/string/nsTSubstring.cpp:556
#4  0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTSubstring.cpp:546
#5  0x00007fffe443ab82 in nsTString<char>::nsTString(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTString.h:96
#6  0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&, std::nothrow_t const&) (this=0x7fffdf6bf090, aTuple=..., aFallible=...) at xpcom/string/nsTSubstring.cpp:556
#7  0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTSubstring.cpp:546
#8  0x00007fffe443ab82 in nsTString<char>::nsTString(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTString.h:96
#9  0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&, std::nothrow_t const&) (this=0x7fffdf6bf0e0, aTuple=..., aFallible=...) at xpcom/string/nsTSubstring.cpp:556
#10 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTSubstring.cpp:546
#11 0x00007fffe443ab82 in nsTString<char>::nsTString(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTString.h:96
#12 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&, std::nothrow_t const&) (this=0x7fffdf6bf130, aTuple=..., aFallible=...) at xpcom/string/nsTSubstring.cpp:556
#13 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTSubstring.cpp:546
#14 0x00007fffe443ab82 in nsTString<char>::nsTString(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTString.h:96
#15 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&, std::nothrow_t const&) (this=0x7fffdf6bf180, aTuple=..., aFallible=...) at xpcom/string/nsTSubstring.cpp:556
#16 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTSubstring.cpp:546
#17 0x00007fffe443ab82 in nsTString<char>::nsTString(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTString.h:96
#18 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&, std::nothrow_t const&) (this=0x7fffdf6bf1d0, aTuple=..., aFallible=...) at xpcom/string/nsTSubstring.cpp:556
#19 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTSubstring.cpp:546
#20 0x00007fffe443ab82 in nsTString<char>::nsTString(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTString.h:96
#21 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&, std::nothrow_t const&) (this=0x7fffdf6bf220, aTuple=..., aFallible=...) at xpcom/string/nsTSubstring.cpp:556
#22 0x00007fffe443ab82 in nsTSubstring<char>::Assign(nsTSubstringTuple<char> const&) (this=0x7fffea2099c4 <gNullChar>, aTuple=...) at xpcom/string/nsTSubstring.cpp:546

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1850529/comments/19

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On 2019-11-07T11:08:01+00:00 Mats-l wrote:

I'm guessing the above code is miscompiled for some reason.
I use the default clang on my system.  Is this version not supported anymore?

```
# /usr/bin/clang --version
clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
```

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1850529/comments/20

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On 2019-11-07T11:16:46+00:00 Mats-l wrote:

This is on "Ubuntu 18.04.3 LTS".

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1850529/comments/21

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On 2019-11-07T12:15:09+00:00 Mats-l wrote:

Problem solved by removing:
```
export CC=/usr/bin/clang
export CXX=/usr/bin/clang++
```
from my .mozconfig file.  Then the build defaulted to use a newer clang I had under `$HOME/.mozbuild/clang/bin/`

I'll leave this bug open anyway in case clang-6 is supposed to be
supported.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1850529/comments/22

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On 2019-11-07T20:27:02+00:00 Erahm wrote:

dmajor pointed out that there are known miscompilation issues with
clang-6 that we've [patched for our version](https://hg.mozilla.org
/mozilla-central/log/5f1704e88fa79ad4156497de208c87c58a228ca2/build
/build-clang/clang-6-linux64.json) that we use in automation. I'm not
sure there's much to do here but maybe add a check for clang-6.0.0 and
refuse to build?

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1850529/comments/23

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On 2019-11-07T20:29:23+00:00 Dmajor-1 wrote:

If the clang-6 is one from taskcluster (say, if it's in .mozbuild) then
it might still work...

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1850529/comments/24

** Changed in: firefox
       Status: Unknown => Confirmed

** Changed in: firefox
   Importance: Unknown => Medium

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Title:
  Crash after update to 71.0~b5+build1-0ubuntu0.16.04.1

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