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Re: Bash crashes with trapped SIGCHLD and read -t.


From: konsolebox
Subject: Re: Bash crashes with trapped SIGCHLD and read -t.
Date: Fri, 25 Jan 2013 00:40:03 +0800

Hi. Thanks for the attention. Here's a backtrace:

summon.
:
disown.
read.
*** glibc detected *** /bin/bash: double free or corruption (fasttop):
0x00000000006caa60 ***

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff740c685 in ?? () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff740c685 in ?? () from /lib64/libc.so.6
#1  0x00007ffff740e2c4 in ?? () from /lib64/libc.so.6
#2  0x00007ffff7412298 in calloc () from /lib64/libc.so.6
#3  0x00007ffff7de5a6f in ?? () from /lib64/ld-linux-x86-64.so.2
#4  0x00007ffff7de10e6 in ?? () from /lib64/ld-linux-x86-64.so.2
#5  0x00007ffff7de2f06 in ?? () from /lib64/ld-linux-x86-64.so.2
#6  0x00007ffff7ded799 in ?? () from /lib64/ld-linux-x86-64.so.2
#7  0x00007ffff7de92a6 in ?? () from /lib64/ld-linux-x86-64.so.2
#8  0x00007ffff7ded23a in ?? () from /lib64/ld-linux-x86-64.so.2
#9  0x00007ffff74b3af2 in ?? () from /lib64/libc.so.6
#10 0x00007ffff7de92a6 in ?? () from /lib64/ld-linux-x86-64.so.2
#11 0x00007ffff74b3b8f in ?? () from /lib64/libc.so.6
#12 0x00007ffff74b3c01 in __libc_dlopen_mode () from /lib64/libc.so.6
#13 0x00007ffff748e925 in ?? () from /lib64/libc.so.6
#14 0x00007ffff748ea6d in backtrace () from /lib64/libc.so.6
#15 0x00007ffff7406e77 in ?? () from /lib64/libc.so.6
#16 0x00007ffff740c375 in ?? () from /lib64/libc.so.6
#17 0x0000000000471aac in read_builtin ()
#18 0x000000000042ba92 in ?? ()
#19 0x000000000042f32c in execute_command_internal ()
#20 0x000000000043167a in ?? ()
#21 0x000000000042d214 in execute_command_internal ()
#22 0x0000000000430ede in execute_command ()
#23 0x00000000004312f5 in ?? ()
#24 0x000000000042d233 in execute_command_internal ()
#25 0x0000000000430ede in execute_command ()
#26 0x000000000041ba31 in reader_loop ()
#27 0x000000000041add5 in main ()

On Fri, Jan 25, 2013 at 12:28 AM, Chet Ramey <address@hidden> wrote:

> On 1/24/13 8:35 AM, konsolebox wrote:
> > Hi. Is there a way to prevent this segmentation fault in Bash? I'm not
> sure
> > where the fault happens but when there's a function that handles a trap
> and
> > when a signal is caught during a session of read with -t, Bash crashes.
> An
> > example code that makes this happen is this:
>
> I ran this script through around 6000 cycles on RHEL 5 using bash-4.2.42,
> built with and without the bash malloc, and didn't see a crash.
>
> How about a stack traceback from one of the crashes you get?
>
> Chet
>
> --
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
>                  ``Ars longa, vita brevis'' - Hippocrates
> Chet Ramey, ITS, CWRU    address@hidden
> http://cnswww.cns.cwru.edu/~chet/
>


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