Bug 165039

Summary:	GDB intermittently fails with gcj-generated (BC-ABI) .sos.
Product:	[Fedora] Fedora	Reporter:	Andrew Cagney <cagney>
Component:	gcc	Assignee:	Jakub Jelinek <jakub>
Status:	CLOSED RAWHIDE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4	CC:	cagney, overholt
Target Milestone:	---
Target Release:	---
Hardware:	powerpc
OS:	Linux
Whiteboard:
Fixed In Version:	4.0.1-7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-08-09 07:57:16 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	165025
Bug Blocks:

Description Andrew Cagney 2005-08-03 19:22:12 UTC

+++ This bug was initially created as a clone of Bug #165025 +++

Description of problem:
GDB intermittently fails with gcj-generated (BC-ABI) .sos.

Version-Release number of selected component (if applicable):
gdb-6.3.0.0-1.24.ppc

How reproducible:
Always ... although no small test case unfortunately.

Steps to Reproduce:
1. start eclipse
2. gdb /usr/bin/java <pid>
3. thread apply all bt (or almost any command ... it happens quite frequently)
  
Actual results:
../../gdb-6.3/gdb/dwarf2-frame.c:454: internal-error: Unknown CFI 47 encountered.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y
../../gdb-6.3/gdb/dwarf2-frame.c:454: internal-error: Unknown CFI 47 encountered.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) n

Expected results:
No gdb failures.

Additional info:
Andrew Cagney has looked into this and knows what the problem is.

Comment 1 Andrew Cagney 2005-08-03 19:25:43 UTC

[is there a gcj category?]

GCJ (libffi) needs to be updated to use DW_CFA_offset_extended_sf instead of
DW_CFA_GNU_negative_offset_extended.

libffi/src/powerpc/sysv.S:172:      .byte     0x2f     /* 
DW_CFA_GNU_negative_offset_extended */
libffi/src/powerpc/ppc_closure.S:244:   .byte   0x2f     #
DW_CFA_GNU_negative_offset_extended

Comment 2 Jakub Jelinek 2005-08-06 09:34:11 UTC

I'll change this.  On the other side, GDB really should handle
DW_CFA_GNU_negative_offset_extended, as there are plenty of binaries/libraries
still using them.

Comment 3 Jakub Jelinek 2005-08-06 10:25:51 UTC

http://gcc.gnu.org/ml/gcc-patches/2005-08/msg00377.html

Comment 4 Andrew Cagney 2005-08-09 14:35:10 UTC

(In reply to comment #2)
> On the other side, GDB really should handle
> DW_CFA_GNU_negative_offset_extended, as there are plenty of binaries/libraries
> still using them.

That's why I cloned the bug, I've got the patch for the GDB side pending.