memory grab, with backtrace

[Silvio Levy]

Dear Emacs folks

I posted this a few days ago, and was advised to post it again after
getting a backtrace.  I hope the backtrace (obtained from emacs-snapshot)
is adequate.  

Thank you

Silvio

> To: Emacs help <address@hidden>
> Subject: memory grab causes machine to grind to a halt
> cc: address@hidden
> From: Silvio Levy <address@hidden>
> Date: Sun, 27 Nov 2011 12:54:10 -0800
> 
> I work mostly at home on a laptop, but I keep a window open at all
> times at my employer's ssh server. It runs emacs and I do some of my
> work inside it (usually in shell-mode).
> 
> Problem: when that window dies, emacs remains alive and often -- days
> later -- it suddenly starts grabbing memory, causing the server to
> grind to a halt until the process is killed somehow.
> 
> Any idea what emacs may be doing?  (Note that this is always a process
> that's no longer interactive.)
> 
> Thanks,
> 
> Silvio
> 



neo:; gdb -p 11547
GNU gdb (GDB) 7.1-ubuntu
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This GDB was configured as "i486-linux-gnu".
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<http://www.gnu.org/software/gdb/bugs/>.
Attaching to process 11547
Reading symbols from /usr/bin/emacs-snapshot-gtk...Reading symbols from 
/usr/lib/debug/usr/bin/emacs-snapshot-gtk...done.
done.
Reading symbols from /usr/lib/libgtk-x11-2.0.so.0...(no debugging symbols 
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[Thread debugging using libthread_db enabled]
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Reading symbols from /usr/lib/libatk-1.0.so.0...(no debugging symbols 
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Reading symbols from /usr/lib/libcairo.so.2...(no debugging symbols 
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found)...done.
Loaded symbols for /usr/lib/libgthread-2.0.so.0
Reading symbols from /lib/tls/i686/cmov/librt.so.1...(no debugging symbols 
found)...done.
Loaded symbols for /lib/tls/i686/cmov/librt.so.1
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
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Reading symbols from /lib/tls/i686/cmov/libdl.so.2...(no debugging symbols 
found)...done.
Loaded symbols for /lib/tls/i686/cmov/libdl.so.2
Reading symbols from /usr/lib/libgsf-1.so.114...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libgsf-1.so.114
Reading symbols from /usr/lib/libcroco-0.6.so.3...(no debugging symbols 
found)...done.
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Reading symbols from /usr/lib/libxml2.so.2...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libxml2.so.2
Reading symbols from /usr/lib/libpixman-1.so.0...(no debugging symbols 
found)...done.
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Reading symbols from /usr/lib/libdirectfb-1.2.so.0...(no debugging symbols 
found)...done.
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found)...done.
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found)...done.
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found)...done.
Loaded symbols for /usr/lib/libxcb-render-util.so.0
Reading symbols from /usr/lib/libxcb-render.so.0...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libxcb-render.so.0
Reading symbols from /lib/tls/i686/cmov/libresolv.so.2...(no debugging symbols 
found)...done.
Loaded symbols for /lib/tls/i686/cmov/libresolv.so.2
Reading symbols from /lib/libselinux.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libselinux.so.1
Reading symbols from /usr/lib/libXau.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXau.so.6
Reading symbols from /usr/lib/libXdmcp.so.6...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libXdmcp.so.6
Reading symbols from /lib/libbz2.so.1.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libbz2.so.1.0
Reading symbols from /lib/tls/i686/cmov/libnss_files.so.2...(no debugging 
symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_files.so.2
Reading symbols from /lib/tls/i686/cmov/libnss_compat.so.2...(no debugging 
symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_compat.so.2
Reading symbols from /lib/tls/i686/cmov/libnsl.so.1...(no debugging symbols 
found)...done.
Loaded symbols for /lib/tls/i686/cmov/libnsl.so.1
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found)...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_nis.so.2
0x00acc422 in __kernel_vsyscall ()
(gdb) backtrace full
#0  0x00acc422 in __kernel_vsyscall ()
No symbol table info available.
#1  0x00967f18 in mmap () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2  0x0090b743 in ?? () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#3  0x0090b989 in ?? () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#4  0x0090e0c5 in malloc () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#5  0x08174393 in lisp_align_malloc (nbytes=1124, type=<value optimized out>)
    at alloc.c:1030
        i = <value optimized out>
        aligned = <value optimized out>
        abase = <value optimized out>
#6  0x08175217 in Fcons (car=138099185, cdr=140422844) at alloc.c:2756
        new = <value optimized out>
        val = <value optimized out>
#7  0x0818b663 in specbind (symbol=138289481, value=138099233) at eval.c:3333
        where = <value optimized out>
        current_buffer = 1048576
        ovalue = <value optimized out>
        valcontents = <value optimized out>
#8  0x08142c9e in signal_before_change (start_int=1, end_int=19, 
    preserve_ptr=0xbfc83300) at insdel.c:2168
        start = <value optimized out>
        end = <value optimized out>
        start_marker = <value optimized out>
        end_marker = <value optimized out>
        preserve_marker = 138099185
#9  0x0814312f in prepare_to_modify_buffer (start=1, end=19, 
    preserve_ptr=0xbfc83300) at insdel.c:2087
        base_buffer = 0x0
#10 0x08145f93 in del_range_1 (from=1, to=19, prepare=1, ret_string=0)
    at insdel.c:1806
        from_byte = <value optimized out>
        to_byte = <value optimized out>
        deletion = <value optimized out>
#11 0x08145fe8 in del_range (from=1, to=19) at insdel.c:1781
---Type <return> to continue, or q <return> to quit---
No locals.
#12 0x0807c2df in setup_echo_area_for_printing (multibyte_p=1) at xdisp.c:8512
No locals.
#13 0x081a64d6 in write_string_1 (data=0xbfc8346a "", size=-1, 
    printcharfun=138099233) at print.c:578
        old = 0x85f08e0
        old_point = -1
        start_point = -1
        old_point_byte = -1
        start_point_byte = -1
        free_print_buffer = 0
#14 0x081a8c79 in print_error_message (data=170001277, stream=138099233, 
    context=0xfffffff4 <Address 0xfffffff4 out of bounds>, caller=138099185)
    at print.c:1050
        errname = 170001277
        errmsg = 139349360
        file_error = <value optimized out>
        tail = <value optimized out>
#15 0x081247a3 in cmd_error_internal (data=170001277, context=0xbfc8346a "")
    at keyboard.c:1304
No locals.
#16 0x081248f8 in cmd_error (data=170001277) at keyboard.c:1233
        old_level = 80
        old_length = 80
        macroerror = 
"\000¿\000\000\000\000\000\000\000\000ñ9;\b\231íJ\b\000\027{¡", '\000' <repeats 
12 times>, "\220¡C\b\220¡C\b ¡C\b¸4È¿"
#17 0x0818a304 in internal_condition_case (bfun=0x812c4a0 <command_loop_1>, 
    handlers=138142225, hfun=0x8124810 <cmd_error>) at eval.c:1503
        val = -12
        c = {tag = 138099185, val = 170001277, next = 0xbfc835f8, gcpro = 0x0, 
          jmp = {{__jmpbuf = {138650000, 138650000, 138650016, -1077398088, 
                -1094152051, 535057378}, __mask_was_saved = 0, __saved_mask = {
                __val = {17, 17, 0, 0, 0, 9084704, 225011984, 3217568768, 
                  12151286, 9111497, 134546766, 3217568748, 134544943, 
                  3078405400, 3217555458, 12174736, 134544943, 3078437496, 
                  12230644, 9050572, 24, 3217568908, 12152742, 141051168, 
                  141083924, 141051168, 1024, 3217569472, 3217569168, 
                  3217569472, 3217569320, 135492228}}}}, backlist = 0x0, 
          handlerlist = 0x0, lisp_eval_depth = 0, pdlcount = 2, 
---Type <return> to continue, or q <return> to quit---
          poll_suppress_count = 1, interrupt_input_blocked = 0, 
          byte_stack = 0x0}
        h = {handler = 138142225, var = 138099185, chosen_clause = 138099233, 
          tag = 0xbfc834d4, next = 0x0}
#18 0x08123cf5 in command_loop_2 () at keyboard.c:1359
        val = -12
#19 0x0818a3c1 in internal_catch (tag=138138249, 
    func=0x8123cd0 <command_loop_2>, arg=138099185) at eval.c:1249
        c = {tag = 138138249, val = 138099185, next = 0x0, gcpro = 0x0, jmp = {
            {__jmpbuf = {138650000, 138650000, 138650016, -1077397816, 
                -1094004595, 535178210}, __mask_was_saved = 0, __saved_mask = {
                __val = {3217569460, 3217569608, 135412322, 3217569472, 0, 0, 
                  0, 0, 0, 0, 138124880, 138099185, 138339776, 3217569448, 
                  135774532, 138339777, 138336706, 138099185, 138124880, 0, 
                  9484718, 0, 0, 0, 0, 0, 138099209, 10441840, 14, 3217569564, 
                  138339777, 138099185}}}}, backlist = 0x0, handlerlist = 0x0, 
          lisp_eval_depth = 0, pdlcount = 2, poll_suppress_count = 1, 
          interrupt_input_blocked = 0, byte_stack = 0x0}
#20 0x0812465f in command_loop () at keyboard.c:1338
No locals.
#21 0x08124a0a in recursive_edit_1 () at keyboard.c:953
        val = <value optimized out>
#22 0x08124b32 in Frecursive_edit () at keyboard.c:1015
        buffer = 138099185
#23 0x0811ad78 in main (argc=<value optimized out>, argv=<value optimized out>)
    at emacs.c:1849
        dummy = -1077396904
        stack_bottom_variable = 8 '\b'
        do_initial_setlocale = 138650000
        skip_args = 1
        rlim = {rlim_cur = 8388608, rlim_max = 18446744073709551615}
        no_loadup = 0
        junk = 0x0
        dname_arg = 0x0
(gdb) 
(gdb) quit
A debugging session is active.

        Inferior 1 [process 11547] will be detached.