Bug 3697

Summary:	gdb cannot read part of fcore core files (can read notes)
Product:	frysk	Reporter:	Phil Muldoon <pmuldoon>
Component:	general	Assignee:	Phil Muldoon <pmuldoon>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	P2
Version:	unspecified
Target Milestone:	---
Host:		Target:
Build:		Last reconfirmed:
Project(s) to access:		ssh public key:
Bug Depends on:
Bug Blocks:	2243
Attachments:	fcore elf section dump gcore section dump cat of /proc/maps

Description Phil Muldoon 2006-12-11 18:42:21 UTC

[pmuldoon@localhost frysk_bin]$ ~/frysk_bin/frysk-core/frysk/bindir/fcore 3109
&& gcore 3109 && cat /proc/3109/maps >& bash_maps

[pmuldoon@localhost frysk_bin]$ eu-readelf -a core.3109 > gcore_elf
[pmuldoon@localhost frysk_bin]$ eu-readelf -a fcore.3109 > fcore_elf

(will add these files as attachments, in further comments)

Comment 1 Phil Muldoon 2006-12-11 18:43:52 UTC

Created attachment 1452 [details]
fcore elf section dump

Comment 2 Phil Muldoon 2006-12-11 18:44:29 UTC

Created attachment 1453 [details]
gcore section dump

Comment 3 Phil Muldoon 2006-12-11 18:45:12 UTC

Created attachment 1454 [details]
cat of /proc/maps

Comment 4 Phil Muldoon 2006-12-11 18:46:23 UTC

Output from loading in a gcore core file:

[pmuldoon@localhost frysk_bin]$ gdb
GNU gdb Red Hat Linux (6.5-13.fc6rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu".
(gdb) set debug target 1
(gdb) core-file core.3109 
core:target_xfer_partial (4, (null), 0x8a0c720,  0x0,  0x0, 512) = 144, bytes =
 20 00 00 00 00 14 ef 00 21 00 00 00 00 10 ef 00 ...
core:target_xfer_partial (2, (null), 0xbf8cead4,  0x0,  0xef1000, 52) = 52,
bytes = 7f 45 4c 46 01 01 01 00 00 00 00 00 ...
core:target_xfer_partial (2, (null), 0x8a0c868,  0x0,  0xef1034, 128) = 128,
bytes = 01 00 00 00 00 00 00 00 ...
core:target_xfer_partial (2, (null), 0x8a0c970,  0x0,  0xef1000, 2192) = 2192,
bytes =
 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 ...
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
Core was generated by `/bin/bash'.
target_fetch_registers (-1)
#0  0x00ef1402 in __kernel_vsyscall ()

Comment 5 Phil Muldoon 2006-12-11 18:47:39 UTC

Output from reading in a fcore file.

[pmuldoon@localhost frysk_bin]$ gdb
GNU gdb Red Hat Linux (6.5-13.fc6rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu".
(gdb) set debug target 1
(gdb) core-file fcore.3109 
core:target_xfer_partial (4, (null), 0x90aa6b8,  0x0,  0x0, 512) = 144, bytes =
20 00 00 00 00 14 ef 00 ...
core:target_xfer_partial (2, (null), 0xbfd4bf44,  0x0,  0xef1000, 52) = 52,
bytes = 7f 45 4c 46 00 00 00 00 00 00 00 00 ...
target_terminal_ours ()
Failed to read a valid object file image from memory.
Core was generated by `bash'.
target_fetch_registers (-1)
core:target_xfer_partial (2, (null), 0xbfd4bef0,  0x0,  0xef1402, 8) = 8, bytes =
 00 00 00 00 00 00 00 00
core:target_xfer_partial (2, (null), 0xbfd4bef1,  0x0,  0xef1402, 7) = 7, bytes
= 00 00 00 00 00 00 00
#0  0x00ef1402 in ?? ()

Comment 6 Phil Muldoon 2006-12-11 22:59:19 UTC

Caused by incomplete memory transger via PtraceByteBuffer.get()

2006-12-11  Phil Muldoon  <pmuldoon@redhat.com>

	* eio/ByteBuffer.java (get): Change to use peekFully over peek.

Comment 7 Phil Muldoon 2006-12-11 23:00:15 UTC

Closed, as upstream bug closed.