Bug#333004: bash fails badly with long brace expansion.
Package: bash
Version: 3.0-16
Severity: normal
The following brace expansion:
echo
{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}
Fails with the following error:
bash: xmalloc: ../bash/make_cmd.c:167: cannot allocate 8 bytes (0 bytes
allocated)
And then the shell dies (crash).
I'm quite sure that on older versions of the shell this worked OK.
I used pdksh to execute the same command and see if it was running
out of memory, but it worked fine.
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.8-2-686
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages bash depends on:
ii base-files3.1.7 Debian base system miscellaneous f
ii libc6 2.3.5-6GNU C Library: Shared libraries an
ii libncurses5 5.4-9 Shared libraries for terminal hand
hi passwd1:4.0.3-35 change and administer password and
bash recommends no packages.
-- no debconf information
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Bug#333004: bash fails badly with long brace expansion.
On Sun, Oct 09, 2005 at 04:15:22PM -0700, John Darrah wrote:
The following brace expansion: echo
{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}
Fails with the following error: bash: xmalloc:
../bash/make_cmd.c:167: cannot allocate 8 bytes (0 bytes allocated)
And then the shell dies (crash).
Do you see high memory usage beforehand? (I don't know if linux
malloc/realloc EVER fail initially, but they can fail after the
fact, with OOM killer).
I'm quite sure that on older versions of the shell this worked OK.
Do you know when or what versions?
I don't know if this is a bug; I was able to duplicate the error, but
with high memory usage. If bash's implementation requires high memory
usage, then its not a bug (though a wishlist to not require such
large ammounts of memory would certainly be legitimate).
--
Clear skies,
Justin
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Bug#333004: bash fails badly with long brace expansion.
On Sun, Oct 09, 2005 at 07:37:23PM -0400, Justin Pryzby wrote:
On Sun, Oct 09, 2005 at 04:15:22PM -0700, John Darrah wrote:
The following brace expansion: echo
{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}
Fails with the following error: bash: xmalloc:
../bash/make_cmd.c:167: cannot allocate 8 bytes (0 bytes allocated)
And then the shell dies (crash).
Do you see high memory usage beforehand? (I don't know if linux
malloc/realloc EVER fail initially, but they can fail after the
fact, with OOM killer).
Shouldn't I see the result of an OOM using dmesg or does the
kernel just kill the process silently??
I answered my own question using pdksh on a huge brace
expansion. yes OOM is reported in a dmesg... so in
conclusion bash is failing before memory exhaustion. I have
2G of swap and it takes a while to get there with pdksh, but
with bash it fails just after a few seconds.
I'm quite sure that on older versions of the shell this worked OK.
Do you know when or what versions?
No... but I'm sure it was the 2.x shell i'm refering to because it's been
a while since i've used brace expansion to generate large lists.
I don't know if this is a bug; I was able to duplicate the error, but
with high memory usage. If bash's implementation requires high memory
usage, then its not a bug (though a wishlist to not require such
large ammounts of memory would certainly be legitimate).
I still think there is something funny going on here.
--
Clear skies,
Justin
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