Re: SIGSEGV during GC

[David Ponce <david.ponce@wanadoo.fr>]

Hi Stefan,

 >>Since I enabled USE_LSB_TAG, Emacs sometimes crashes after a variable
 >>period of intensive use.
 >
 >
 > I installed another change at around the same time that had to do with
 > mark_kboards, so maybe it's unrelated to USE_LSB_TAG.  I'll investigate
 > on my side, but could you try and see if the bug also shows up if you don't
 > USE_LSB_TAG ?

Since your advice, I used (daily) a version of CVS GNU Emacs built without
USE_LSB_TAG enabled, and didn't experienced any crash.

So today I rebuilt Emacs with USE_LSB_TAG enabled, and after a short
period of use it crashed (SIGSEGV) during GC.

Following is the gdb backtrace I got.  My environment is:

GNU/Linux Fedora Core 1
gcc (GCC) 3.3.2 20031022 (Red Hat Linux 3.3.2-1)

In GNU Emacs 21.3.50.1 (i686-pc-linux-gnu, GTK+ Version 2.2.4)
  of 2004-02-01 on maunakea
configured using `configure '--prefix=/home/ponce' '--with-x-toolkit=gtk''

Important settings:
   value of $LC_ALL: nil
   value of $LC_COLLATE: nil
   value of $LC_CTYPE: nil
   value of $LC_MESSAGES: nil
   value of $LC_MONETARY: nil
   value of $LC_NUMERIC: nil
   value of $LC_TIME: nil
   value of $LANG: en_US.UTF-8
   locale-coding-system: utf-8
   default-enable-multibyte-characters: t

Hope this will help.

David


Starting program: /home/ponce/installs/emacs/src/emacs

Program received signal SIGSEGV, Segmentation fault.
0x0815a058 in mark_object (arg=0) at alloc.c:5040
5040            if (CONS_MARKED_P (ptr)) break;
(gdb) bt
#0  0x0815a058 in mark_object (arg=0) at alloc.c:5040
#1  0x0811f477 in mark_kboards () at keyboard.c:11316
#2  0x08159563 in Fgarbage_collect () at alloc.c:4465
#3  0x0816cb82 in Feval (form=138077792) at eval.c:2077
#4  0x0816a55b in Fprogn (args=470) at eval.c:408
#5  0x0816b021 in FletX (args=165065613) at eval.c:878
#6  0x0816cce1 in Feval (form=138082380) at eval.c:2027
#7  0x0816a55b in Fprogn (args=470) at eval.c:408
#8  0x0816b021 in FletX (args=165224941) at eval.c:878
#9  0x0816cce1 in Feval (form=138082380) at eval.c:2027
#10 0x0816ca81 in Feval (form=164733237) at eval.c:2136
#11 0x0816a55b in Fprogn (args=470) at eval.c:408
#12 0x0816a499 in Fif (args=165065501) at eval.c:357
#13 0x0816cce1 in Feval (form=138082020) at eval.c:2027
#14 0x0816a55b in Fprogn (args=470) at eval.c:408
#15 0x0816d89d in funcall_lambda (fun=165063800, nargs=2,
     arg_vector=0xbff01850) at eval.c:2908
#16 0x0816d6df in apply_lambda (fun=165063805, args=164739021,
     eval_flag=1) at eval.c:2837
#17 0x0816ca14 in Feval (form=165063805) at eval.c:2138
#18 0x0816a55b in Fprogn (args=470) at eval.c:408
#19 0x0816cce1 in Feval (form=138082068) at eval.c:2027
#20 0x0816ad6b in Fdefconst (args=164696333) at eval.c:795
#21 0x0816cce1 in Feval (form=138082332) at eval.c:2027
#22 0x081808b3 in readevalloop (readcharfun=164668188, stream=0x0,
     sourcename=164692827, evalfun=0x816c864 <Feval>, printflag=0,
     unibyte=138358609, readfun=138358609) at lread.c:1376
#23 0x08180b42 in Feval_buffer (buffer=44, printflag=17294826,
     filename=164692827, unibyte=138358609, do_allow_print=135671776)
     at lread.c:1434
#24 0x0816d5a7 in Ffuncall (nargs=6, args=0xbff01c64) at eval.c:2744
#25 0x08195daf in Fbyte_code (bytestr=138651209, vector=5,
     maxdepth=-1074783136) at bytecode.c:689
#26 0x0816d863 in funcall_lambda (fun=136234364, nargs=4,
     arg_vector=0xbff01da4) at eval.c:2915
#27 0x0816d44f in Ffuncall (nargs=5, args=0xbff01da0) at eval.c:2785
#28 0x0816d2cc in call4 (fn=138746265, arg1=164667763, arg2=164692827,
     arg3=138358609, arg4=138358657) at eval.c:2591
#29 0x0817fbfa in Fload (file=164692827, noerror=17294826,
     nomessage=17294832, nosuffix=0, must_suffix=17294832) at
     lread.c:864
#30 0x08176837 in Frequire (feature=164664001, filename=138358609,
     noerror=138358609) at fns.c:3408
#31 0x0816cb98 in Feval (form=138084944) at eval.c:2080
#32 0x081808b3 in readevalloop (readcharfun=164546852, stream=0x0,
     sourcename=164531763, evalfun=0x816c864 <Feval>, printflag=0,
     unibyte=138358609, readfun=138358609) at lread.c:1376
#33 0x08180b42 in Feval_buffer (buffer=44, printflag=17294826,
     filename=164531763, unibyte=138358609, do_allow_print=135671776)
     at lread.c:1434
#34 0x0816d5a7 in Ffuncall (nargs=6, args=0xbff02124) at eval.c:2744
---Type <return> to continue, or q <return> to quit---
#35 0x08195daf in Fbyte_code (bytestr=138651209, vector=5,
     maxdepth=-1074781920) at bytecode.c:689
#36 0x0816d863 in funcall_lambda (fun=136234364, nargs=4,
     arg_vector=0xbff02264) at eval.c:2915
#37 0x0816d44f in Ffuncall (nargs=5, args=0xbff02260) at eval.c:2785
#38 0x0816d2cc in call4 (fn=138746265, arg1=164546155, arg2=164531763,
     arg3=138358609, arg4=138358657) at eval.c:2591
#39 0x0817fbfa in Fload (file=164531763, noerror=17294826,
     nomessage=17294832, nosuffix=0, must_suffix=17294832) at
     lread.c:864
#40 0x08176837 in Frequire (feature=162804329, filename=138358609,
     noerror=138358609) at fns.c:3408
#41 0x0816cb98 in Feval (form=138084944) at eval.c:2080
#42 0x081808b3 in readevalloop (readcharfun=164503060, stream=0x0,
     sourcename=159173547, evalfun=0x816c864 <Feval>, printflag=0,
     unibyte=138358609, readfun=138358609) at lread.c:1376
#43 0x08180b42 in Feval_buffer (buffer=44, printflag=17294826,
     filename=159173547, unibyte=138358609, do_allow_print=135671776)
     at lread.c:1434
#44 0x0816d5a7 in Ffuncall (nargs=6, args=0xbff025e4) at eval.c:2744
#45 0x08195daf in Fbyte_code (bytestr=138651209, vector=5,
     maxdepth=-1074780704) at bytecode.c:689
#46 0x0816d863 in funcall_lambda (fun=136234364, nargs=4,
     arg_vector=0xbff02724) at eval.c:2915
#47 0x0816d44f in Ffuncall (nargs=5, args=0xbff02720) at eval.c:2785
#48 0x0816d2cc in call4 (fn=138746265, arg1=164531379, arg2=159173547,
     arg3=138358609, arg4=138358609) at eval.c:2591
#49 0x0817fbfa in Fload (file=159173547, noerror=17294826,
     nomessage=17294826, nosuffix=0, must_suffix=17294832) at
     lread.c:864
#50 0x0816c774 in do_autoload (fundef=159156061, funname=159164281) at
     eval.c:1925
#51 0x0816d41a in Ffuncall (nargs=1, args=0xbff02950) at eval.c:2788
#52 0x08195daf in Fbyte_code (bytestr=138668673, vector=0,
     maxdepth=-1074779824) at bytecode.c:689
#53 0x0816d863 in funcall_lambda (fun=136334804, nargs=0,
     arg_vector=0xbff02a00) at eval.c:2915
#54 0x0816d6df in apply_lambda (fun=136334804, args=138358609,
     eval_flag=1) at eval.c:2837
#55 0x0816ca14 in Feval (form=136334804) at eval.c:2138
#56 0x0816b8f7 in Fcondition_case (args=138358609) at eval.c:1280
#57 0x08196e15 in Fbyte_code (bytestr=138442825, vector=143,
     maxdepth=-1074779040) at bytecode.c:870
#58 0x0816d863 in funcall_lambda (fun=136327900, nargs=1,
     arg_vector=0xbff02d74) at eval.c:2915
#59 0x0816d44f in Ffuncall (nargs=2, args=0xbff02d70) at eval.c:2785
#60 0x08195daf in Fbyte_code (bytestr=138729353, vector=1, maxdepth=-1074778768) at bytecode.c:689
#61 0x0816d863 in funcall_lambda (fun=136326684, nargs=2,
     arg_vector=0xbff02e94) at eval.c:2915
#62 0x0816d44f in Ffuncall (nargs=3, args=0xbff02e90) at eval.c:2785
#63 0x08195daf in Fbyte_code (bytestr=138616753, vector=2,
     maxdepth=-1074778480) at bytecode.c:689
#64 0x0816d863 in funcall_lambda (fun=136323996, nargs=6,
     arg_vector=0xbff02fa4) at eval.c:2915
#65 0x0816d44f in Ffuncall (nargs=7, args=0xbff02fa0) at eval.c:2785
#66 0x08195daf in Fbyte_code (bytestr=138733297, vector=6,
     maxdepth=-1074778208) at bytecode.c:689
#67 0x0816d863 in funcall_lambda (fun=136321540, nargs=4,
     arg_vector=0xbff030c4) at eval.c:2915
#68 0x0816d44f in Ffuncall (nargs=5, args=0xbff030c0) at eval.c:2785
#69 0x08195daf in Fbyte_code (bytestr=138615953, vector=4,
     maxdepth=-1074777920) at bytecode.c:689
#70 0x0816d863 in funcall_lambda (fun=136315708, nargs=1,
     arg_vector=0xbff03180) at eval.c:2915
#71 0x0816d6df in apply_lambda (fun=136315708, args=159134579,
     eval_flag=1) at eval.c:2837
---Type <return> to continue, or q <return> to quit---
#72 0x0816ca14 in Feval (form=136315708) at eval.c:2138
#73 0x0816a55b in Fprogn (args=470) at eval.c:408
#74 0x0816a499 in Fif (args=159240589) at eval.c:357
#75 0x0816cce1 in Feval (form=138082020) at eval.c:2027
#76 0x0816a55b in Fprogn (args=470) at eval.c:408
#77 0x0816d89d in funcall_lambda (fun=159240464, nargs=1,
     arg_vector=0xbff03450) at eval.c:2908
#78 0x0816d6df in apply_lambda (fun=159240469, args=159134579,
     eval_flag=1) at eval.c:2837
#79 0x0816ca14 in Feval (form=159240469) at eval.c:2138
#80 0x0816a55b in Fprogn (args=470) at eval.c:408
#81 0x0816d89d in funcall_lambda (fun=161076240, nargs=0,
     arg_vector=0xbff03684) at eval.c:2908
#82 0x0816d44f in Ffuncall (nargs=1, args=0xbff03680) at eval.c:2785
#83 0x0816d24a in apply1 (fn=162739689, arg=470) at eval.c:2478
#84 0x08169d50 in Fcall_interactively (function=162739689,
     record_flag=17294826, keys=138415468) at callint.c:414
#85 0x0811ce8b in Fcommand_execute (cmd=162739689,
     record_flag=138358609, keys=138358609, special=0) at
     keyboard.c:9627
#86 0x081121b3 in command_loop_1 () at keyboard.c:1727
#87 0x0816b9fa in internal_condition_case (bfun=0x8111dfc
     <command_loop_1>, handlers=138419489, hfun=0x81119c4 <cmd_error>)
     at eval.c:1333
#88 0x08111cba in command_loop_2 () at keyboard.c:1264
#89 0x0816b56d in internal_catch (tag=0, func=0x8111c9c
     <command_loop_2>, arg=138358609) at eval.c:1094
#90 0x08111c70 in command_loop () at keyboard.c:1243
#91 0x081117a0 in recursive_edit_1 () at keyboard.c:959
#92 0x081118ac in Frecursive_edit () at keyboard.c:1015
#93 0x08110209 in main (argc=1, argv=0xbff03e64) at emacs.c:1666