Bug 1377020

Summary:	Damangler error when debugging WebKit
Product:	[Fedora] Fedora	Reporter:	Michael Catanzaro <mcatanzaro+wrong-account-do-not-cc>
Component:	gdb	Assignee:	Jan Kratochvil <jan.kratochvil>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	unspecified
Version:	24	CC:	gbenson, jan.kratochvil, palves, pmuldoon, sergiodj, tom
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Hardware:	x86_64
OS:	Linux
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Last Closed:	2016-09-18 22:26:12 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Michael Catanzaro 2016-09-17 15:07:27 UTC

Description of problem: Demangler error when debugging any program that uses WebKit trunk

Version-Release number of selected component (if applicable): gdb-7.11.1-75.fc24

How reproducible: Always

Steps to Reproduce:
1. Build WebKit from trunk (sorry :S it's terrible but that's my reproducer)
2. gdb epiphany

Maybe the bug will occur with F25's WebKit, that would be a way easier reproducer. But I haven't tested with F25 yet. Since this is a demangler error, I'm hoping the bug report will be useful anyway.

Actual results:

../../gdb/cp-support.c:1595: demangler-warning: unable to demangle '_ZSt7forwardIRZN6WebKit29NetworkConnectionToWebProcess26writeBlobsToTemporaryFilesERKN3WTF6VectorINS2_6StringELm0ENS2_15CrashOnOverflowELm16EEEmEUlRT_E_EOS9_RNSt16remove_referenceIS9_E4typeE' (demangler failed with signal 11)
Unable to dump core, use `ulimit -c unlimited' before executing GDB next time.
Missing separate debuginfos, use: dnf debuginfo-install avahi-gobject-0.6.32-4.fc24.x86_64 avahi-libs-0.6.32-4.fc24.x86_64 sqlite-libs-3.13.0-1.fc24.x86_64
../../gdb/cp-support.c:1608: demangler-warning: unable to demangle '_ZSt7forwardIRZN6WebKit29NetworkConnectionToWebProcess26writeBlobsToTemporaryFilesERKN3WTF6VectorINS2_6StringELm0ENS2_15CrashOnOverflowELm16EEEmEUlRT_E_EOS9_RNSt16remove_referenceIS9_E4typeE' (demangler failed with signal 11)
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) n

This is a bug, please report it. For instructions, see:
<http://www.gnu.org/software/gdb/bugs/>.

Expected results: No demangler error

Additional info:

Comment 1 Michael Catanzaro 2016-09-17 15:10:55 UTC

Ah, here's a much better reproducer (from the upstream bug):

echo '_ZSt7forwardIRZZN6WebKit29NetworkConnectionToWebProcess26writeBlobsToTemporaryFilesERKN3WTF6VectorINS2_6StringELm0ENS2_15CrashOnOverflowELm16EEEmENUlRT_E_clIS7_EEDaSA_EUlvE_EOS9_RNSt16remove_referenceIS9_E4typeE' | c++filt

Comment 2 Jan Kratochvil 2016-09-18 22:26:12 UTC

All Bug duplicates to be verified after the upstream GCC Bug gets fixed.

*** This bug has been marked as a duplicate of bug 1367131 ***