pending/2442: gdb gnats Problem Report: 2353

["Doug Toppin" <dougtoppin at gmail dot com>]

>Number:         2442
>Category:       pending
>Synopsis:       gdb gnats Problem Report: 2353
>Confidential:   yes
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   unknown
>Arrival-Date:   Thu Apr 03 17:28:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     
>Release:        
>Organization:
>Environment:
>Description:
 i built gdb-6.8 last night and cored it while debugging something this
 morning.   i checked gnats and found what appears to be the same
 issue( Problem Report: 2353)  but with a different cause.  i was able
 to reproduce it and the cause appears to be adding a variable name to
 the frame command as such 'f 2 variable'.  i think that the
 '(gdb) f 2 prr_p
 #0  0x00000002 in ?? ()'  in the below output indicates the issue
 where the variable is in the current frame but but doesn't exist in
 the frame being referenced.
 
 i just wanted to pass this info along in case it was useful.  i may
 try to look at the gdb source this weekend to see if i can identify
 what's happening.
 
 doug
 
 the commands i entered (output deleted) were:
 
 $ gdb xxxxx
 GNU gdb 6.8
 Copyright (C) 2008 Free Software Foundation, Inc.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
 and "show warranty" for details.
 This GDB was configured as "i686-pc-linux-gnu"...
 (gdb) attach 8913
 Attaching to program: xxxxxx, process 8913
 Reading symbols from /lib/libcrypt.so.1...done.
 Loaded symbols for /lib/libcrypt.so.1
 Reading symbols from /lib/libm.so.6...done.
 Loaded symbols for /lib/libm.so.6
 Reading symbols from /lib/libc.so.6...done.
 Loaded symbols for /lib/libc.so.6
 Reading symbols from /lib/ld-linux.so.2...done.
 Loaded symbols for /lib/ld-linux.so.2
 Reading symbols from /lib/libnss_files.so.2...done.
 Loaded symbols for /lib/libnss_files.so.2
 Reading symbols from /lib/libnss_dns.so.2...done.
 Loaded symbols for /lib/libnss_dns.so.2
 Reading symbols from /lib/libresolv.so.2...done.
 Loaded symbols for /lib/libresolv.so.2
 0xb75395be in poll () from /lib/libc.so.6
 (gdb) cont
 Continuing.
 
 Program received signal SIGINT, Interrupt.
 0xb75395be in poll () from /lib/libc.so.6
 (gdb) break xxxxxxxxxx
 Breakpoint 1 at 0x808e0af: file xxxxx, line xxx.
 (gdb) cont
 Continuing.
 
 Breakpoint 1, xxxxxxxxxxxx
 856        xxxxxxx
 (gdb) bt
 #0
 #1
 #2
 #3
 #4
 #5
 #6
 #7
 
 #8
 #9
 #10
 #11
 #12
 #13
 
 (gdb) f 2
 #2  xxxxxx
 xxxxxxxxx
 (gdb) f 2 prr_p
 #0  0x00000002 in ?? ()
 (gdb) info f 2
 Stack frame at 0xbfffc920:
  eip = 0x808d78e in xxxxxx; saved eip 0x80a42fd
  called by frame at 0xbfffc960, caller of frame at 0xbfffc8c0
  source language c.
  Arglist at 0xbfffc918, args: zdb_p=0xc959290, prr_p=0xb1c6bab0
  Locals at 0xbfffc918, Previous frame's sp is 0xbfffc920
  Saved registers:
   ebx at 0xbfffc914, ebp at 0xbfffc918, eip at 0xbfffc91c
 (gdb) help info f
 All about selected stack frame, or frame at ADDR.
 (gdb) info  frame
 Stack level 0, frame at 0x2:
  eip = 0x2; saved eip
 dwarf2-frame.c:860: internal-error: dwarf2_frame_cache: Assertion `fde
 != NULL' failed.
 A problem internal to GDB has been detected,
 further debugging may prove unreliable.
 Quit this debugging session? (y or n) y
 dwarf2-frame.c:860: internal-error: dwarf2_frame_cache: Assertion `fde
 != NULL' failed.
 A problem internal to GDB has been detected,
 further debugging may prove unreliable.
 Create a core file of GDB? (y or n) y
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: