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Re: coredump from C-c-ed function


From: xftroxgpx
Subject: Re: coredump from C-c-ed function
Date: Tue, 23 Jan 2018 10:39:20 -0500

‚Äč

-------- Original Message --------
 On January 23, 2018 2:54 PM, Chet Ramey <address@hidden> wrote:

>On 1/23/18 3:30 AM, xftroxgpx wrote:
>
>>Bash Version: 4.4
>> Patch Level: 12
>> Release Status: release
>>Description:
>> bash coredumps by interrupting a called a function via C-c
>>Repeat-By:
>>1. get interactive bash shell
>>
>>2. paste this function definition at command prompt
>> function dv3() {
>> local ec=1
>> time while test "$ec" -ne "0"; do
>> sleep 1
>> ls /$RANDOM
>> ec="$?"
>> done
>> }
>>
>>3. now call it: $ dv3
>>
>>4. C-c at any point
>>
>>
> $ ./bash
> $ echo $BASH_VERSION
> 4.4.12(2)-release
> $ function dv3() {
>>local ec=1
>> time while test "$ec" -ne "0"; do
>> sleep 1
>> ls /$RANDOM
>> ec="$?"
>> done
>> }
>>
>$ type dv3
> dv3 is a function
> dv3 ()
> {
> local ec=1;
> time while test "$ec" -ne "0"; do
> sleep 1;
> /bin/ls -F /$RANDOM;
> ec="$?";
> done
> }
> $ dv3
> /bin/ls: cannot access /10692: No such file or directory
> /bin/ls: cannot access /8614: No such file or directory
> /bin/ls: cannot access /22963: No such file or directory
> ^C
>
> real  0m3.189s
> user  0m0.002s
> sys   0m0.008s
> $
>
> (I have an alias for ls.)
Seems like you hit variant B) here.
where you get to see the prompt but there still was a coredump, which looks 
like this on `journalctl -efa --no-hostname`, for me:
$ type dv3
dv3 is a function
dv3 () 
{ 
    local ec=1;
    time while test "$ec" -ne "0"; do
        sleep 1;
        ls --color=auto /$RANDOM;
        ec="$?";
    done
}
$ dv3
ls: cannot access '/10004': No such file or directory
ls: cannot access '/9610': No such file or directory
^C

real    0m3.001s
user    0m0.001s
sys     0m0.008s
$

#still got prompt
#(in another terminal) partial output of `journalctl -efa --no-hostname` is:
Jan 23 16:19:50 systemd-coredump[2517]: Process 2515 (bash) of user 1000 dumped 
core.

Stack trace of thread 2515:
#0  0x00007f3763d7649d _int_malloc (libc.so.6)
#1  0x00007f3763d782f3 malloc (libc.so.6)
#2  0x000000000047224e xmalloc (bash)
#3  0x000000000042a1c9 make_bare_word (bash)
#4  0x000000000043c8ed copy_word_list (bash)
#5  0x000000000043ce3f copy_command (bash)
#6  0x000000000043ce09 copy_command (bash)
#7  0x000000000043cf5e n/a (bash)
#8  0x000000000043cbb1 copy_command (bash)
#9  0x000000000043cbf9 copy_command (bash)
#10 0x000000000043cc3a copy_command (bash)
#11 0x0000000000434c01 n/a (bash)
#12 0x00000000004310d9 n/a (bash)
#13 0x0000000000431e4c execute_command_internal (bash)
#14 0x000000000047894f parse_and_execute (bash)
#15 0x000000000044dd71 command_substitute (bash)
#16 0x000000000045285e n/a (bash)
#17 0x0000000000453d11 n/a (bash)
#18 0x0000000000455409 expand_prompt_string (bash)
#19 0x000000000041dd74 decode_prompt_string (bash)
#20 0x000000000041e791 n/a (bash)
#21 0x0000000000427c46 yyparse (bash)
#22 0x000000000041c12f parse_command (bash)
#23 0x000000000041c218 read_command (bash)
#24 0x000000000041c3f9 reader_loop (bash)
#25 0x000000000041b1b5 main (bash)
#26 0x00007f3763d16f4a __libc_start_main (libc.so.6)
#27 0x000000000041b6fa _start (bash)
Jan 23 16:19:50 systemd-coredump[2522]: Process 2520 (bash) of user 1000 dumped 
core.

Stack trace of thread 2520:
#0  0x00007f3763d7649d _int_malloc (libc.so.6)
#1  0x00007f3763d782f3 malloc (libc.so.6)
#2  0x000000000047224e xmalloc (bash)
#3  0x000000000042a1c9 make_bare_word (bash)
#4  0x000000000043c8ed copy_word_list (bash)
#5  0x000000000043ce3f copy_command (bash)
#6  0x000000000043cdf4 copy_command (bash)
#7  0x000000000043cbf9 copy_command (bash)
#8  0x000000000043cbe8 copy_command (bash)
#9  0x000000000043cc3a copy_command (bash)
#10 0x0000000000434c01 n/a (bash)
#11 0x00000000004310d9 n/a (bash)
#12 0x0000000000431e4c execute_command_internal (bash)
#13 0x000000000047894f parse_and_execute (bash)
#14 0x000000000044dd71 command_substitute (bash)
#15 0x000000000045285e n/a (bash)
#16 0x0000000000453d11 n/a (bash)
#17 0x0000000000455409 expand_prompt_string (bash)
#18 0x000000000041dd74 decode_prompt_string (bash)
#19 0x000000000041e791 n/a (bash)
#20 0x0000000000427c46 yyparse (bash)
#21 0x000000000041c12f parse_command (bash)
#22 0x000000000041c218 read_command (bash)
#23 0x000000000041c3f9 reader_loop (bash)
#24 0x000000000041b1b5 main (bash)
#25 0x00007f3763d16f4a __libc_start_main (libc.so.6)
#26 0x000000000041b6fa _start (bash)

#continuing in original terminal, where I still got a prompt
$ echo a
a
$

#still got a prompt
#looking at journalctl again:
Jan 23 16:22:44 systemd-coredump[2726]: Process 2724 (bash) of user 1000 dumped 
core.

Stack trace of thread 2724:
#0  0x00007f3763d7649d _int_malloc (libc.so.6)
#1  0x00007f3763d782f3 malloc (libc.so.6)
#2  0x000000000047224e xmalloc (bash)
#3  0x000000000042a1c9 make_bare_word (bash)
#4  0x000000000043c8ed copy_word_list (bash)
#5  0x000000000043ce3f copy_command (bash)
#6  0x000000000043ce09 copy_command (bash)
#7  0x000000000043cf5e n/a (bash)
#8  0x000000000043cbb1 copy_command (bash)
#9  0x000000000043cbf9 copy_command (bash)
#10 0x000000000043cc3a copy_command (bash)
#11 0x0000000000434c01 n/a (bash)
#12 0x00000000004310d9 n/a (bash)
#13 0x0000000000431e4c execute_command_internal (bash)
#14 0x000000000047894f parse_and_execute (bash)
#15 0x000000000044dd71 command_substitute (bash)
#16 0x000000000045285e n/a (bash)
#17 0x0000000000453d11 n/a (bash)
#18 0x0000000000455409 expand_prompt_string (bash)
#19 0x000000000041dd74 decode_prompt_string (bash)
#20 0x000000000041e791 n/a (bash)
#21 0x0000000000427c46 yyparse (bash)
#22 0x000000000041c12f parse_command (bash)
#23 0x000000000041c218 read_command (bash)
#24 0x000000000041c3f9 reader_loop (bash)
#25 0x000000000041b1b5 main (bash)
#26 0x00007f3763d16f4a __libc_start_main (libc.so.6)
#27 0x000000000041b6fa _start (bash)
Jan 23 16:22:44 systemd-coredump[2731]: Process 2729 (bash) of user 1000 dumped 
core.

Stack trace of thread 2729:
#0  0x00007f3763d7649d _int_malloc (libc.so.6)
#1  0x00007f3763d782f3 malloc (libc.so.6)
#2  0x000000000047224e xmalloc (bash)
#3  0x000000000042a1c9 make_bare_word (bash)
#4  0x000000000043c8ed copy_word_list (bash)
#5  0x000000000043ce3f copy_command (bash)
#6  0x000000000043cdf4 copy_command (bash)
#7  0x000000000043cbf9 copy_command (bash)
#8  0x000000000043cbe8 copy_command (bash)
#9  0x000000000043cc3a copy_command (bash)
#10 0x0000000000434c01 n/a (bash)
#11 0x00000000004310d9 n/a (bash)
#12 0x0000000000431e4c execute_command_internal (bash)
#13 0x000000000047894f parse_and_execute (bash)
#14 0x000000000044dd71 command_substitute (bash)
#15 0x000000000045285e n/a (bash)
#16 0x0000000000453d11 n/a (bash)
#17 0x0000000000455409 expand_prompt_string (bash)
#18 0x000000000041dd74 decode_prompt_string (bash)
#19 0x000000000041e791 n/a (bash)
#20 0x0000000000427c46 yyparse (bash)
#21 0x000000000041c12f parse_command (bash)
#22 0x000000000041c218 read_command (bash)
#23 0x000000000041c3f9 reader_loop (bash)
#24 0x000000000041b1b5 main (bash)
#25 0x00007f3763d16f4a __libc_start_main (libc.so.6)
#26 0x000000000041b6fa _start (bash)

#now continuing at the prompt of original terminal
$ dv3

#that causes immediate exit(ie. variant A.) due to the final coredump(and if 
running inside xfce4-terminal, the window is closed only now), as seen in 
journalctl:
Jan 23 16:25:45 systemd-coredump[2893]: Process 2352 (bash) of user 1000 dumped 
core.

Stack trace of thread 2352:
#0  0x00007f3763d7649d _int_malloc (libc.so.6)
#1  0x00007f3763d782f3 malloc (libc.so.6)
#2  0x000000000047224e xmalloc (bash)
#3  0x000000000045b39b unwind_protect_mem (bash)
#4  0x000000000043500a n/a (bash)
#5  0x00000000004310d9 n/a (bash)
#6  0x0000000000431e4c execute_command_internal (bash)
#7  0x0000000000433a6e execute_command (bash)
#8  0x000000000041c492 reader_loop (bash)
#9  0x000000000041b1b5 main (bash)
#10 0x00007f3763d16f4a __libc_start_main (libc.so.6)
#11 0x000000000041b6fa _start (bash)

Sometimes, depending on timing, variant A. happens without variant B. first. (I 
believe this is the one you hit in your subsequent reply here 
https://lists.gnu.org/archive/html/bug-bash/2018-01/msg00063.html ). But 
usually variant B. (then A.) is what happens, as I tried to illustrate above.

If by any chance, more env. stuff is needed to reproduce (at least PS1 is not 
really needed, i tested - but it could modify the stacktraces, maybe) then here 
are my .bashrc, .bash_profile, .extend.bashrc and .second.bashrc , in this 
directory: 
https://github.com/xftroxgpx/a3/tree/864b56c5f0821e2d25a647315168f14739889f98/system/Z575/OSes/3archlinux/on_baremetal/filesystem_now/archlinux/home/xftroxgpx/bin/confHOME/home/xftroxgpx

Thank you for taking a look at this, Chet.
Cheers!

>
>The lyf so short, the craft so long to lerne.'' - ChaucerArs longa, vita 
>brevis'' - Hippocrates
> Chet Ramey, UTech, CWRU address@hidden://tiswww.cwru.edu/~chet/
>




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