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Re: emacs segfault on bootstrap
From: |
Chong Yidong |
Subject: |
Re: emacs segfault on bootstrap |
Date: |
Sun, 29 Jan 2006 14:09:03 -0500 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) |
OK, now I can reproduce this (I had to reinstall gcc-3.4 -- the bug
doesn't show up for gcc4, or for -O2 and below).
I managed to get a backtrace. A Lisp_Int was passed to print_object,
but, for some reason, print_object is in the Lisp_Vectorlike case
statement instead.
A cursory inspection did not reveal any bugs in print_object. Smells
like a compiler bug.
Program received signal SIGSEGV, Segmentation fault.
0x0819c3be in print_object (obj=58, printcharfun=137788457, escapeflag=1)
at print.c:2009
2009 switch (XMISCTYPE (obj))
(gdb) bt
#0 0x0819c3be in print_object (obj=58, printcharfun=137788457, escapeflag=1)
at print.c:2009
#1 0x0819c4c5 in print_object (obj=137726760, printcharfun=137788457,
escapeflag=1) at print.c:1999
#2 0x0819e989 in Fprin1 (object=137726764, printcharfun=137788457)
at print.c:1295
#3 0x0819eedd in print_error_message (data=142518805, stream=137788457,
context=0x2 <Address 0x2 out of bounds>, caller=142518437) at print.c:1097
#4 0x08112a1a in cmd_error_internal (data=142518805, context=0xbfcfffb0 "")
at keyboard.c:1263
#5 0x08112bae in cmd_error (data=142518805) at keyboard.c:1200
#6 0x081856fc in internal_condition_case (bfun=0x811c420 <command_loop_1>,
handlers=137832193, hfun=0x8112ad0 <cmd_error>) at eval.c:1455
#7 0x0810cda6 in command_loop_2 () at keyboard.c:1323
#8 0x0818564a in internal_catch (tag=2, func=0x810cd80 <command_loop_2>,
arg=137788409) at eval.c:1211
#9 0x0810cc3d in recursive_edit_1 () at keyboard.c:1302
#10 0x0810cd3c in Frecursive_edit () at keyboard.c:1056
#11 0x0810bff3 in main (argc=3, argv=0xbfd00574) at emacs.c:1789
(gdb) f 1
#1 0x0819c4c5 in print_object (obj=137726760, printcharfun=137788457,
escapeflag=1) at print.c:1999
1999 print_object (tem, printcharfun, escapeflag);
(gdb) p tem
$3 = 2
(gdb) p size
$4 = 10
(gdb) p obj
$5 = 137726760
(gdb) xtype
Lisp_Int
(gdb) xvector
$6 = (struct Lisp_Vector *) 0x8358b28
0
(gdb) p $6->contents[0]
$11 = 58