From Newsgroup: comp.sys.mac.system

benlotto wrote:

void * clvrmnky() wrote:

Benjamin Lotto wrote:

I've never had any problem ssh-ing to other machines from mine, but
recently I've started getting the following error every time I use ssh:

ssh(477) malloc: *** Deallocation of a pointer not malloced: 0x1; This
could be a double free(), or free() called with the middle of an
allocated block; Try setting environment variable MallocHelp to see
tools to help debug

Did this happen with the new system update? Is there some easy fix?
ssh still works fine, but the message is annoying.

What is the output from "ssh -V"?

OpenSSH_3.8.1p1, OpenSSL 0.9.7i 14 Oct 2005

What level of OS X are you running?

10.4.6

I should add that this happens on my office machine and the lab
machines I manage, but not on my iBook (which is also running 10.4.6).

Same as what I'm running. It looks like the OS is unhappy in some
manner with how one or more apps are asking for resources. MallocDebug
is a general purpose memory and stack checking utility available to applications.

If you are technically minded, and would like to collect some info on
this, read <http://devworld.apple.com/technotes/tn2004/tn2124.html> Pay specific attention to the "Guarded Memory Allocator" section.

Otherwise, the usual incantations apply: see if perhaps a softlinked
library is wrong by running Repair Permissions. A bit of a hail-mary, I
know. If no other apps or commands also cause this warning, and/or
Repair Perms does not help, it may be time to look at the specific
libraries that ssh uses.

otool -L /usr/bin/ssh will give you a list of dynamic libs and their
versions. It should look something like this:

clvrmnky@Swizzle:~ # otool -L /usr/bin/ssh
/usr/bin/ssh:
/usr/lib/libcrypto.0.9.7.dylib (compatibility version 0.9.7,
current version 0.9.7)
/usr/lib/libbsm.dylib (compatibility version 1.0.0, current
version 1.0.0)
/usr/lib/libz.1.dylib (compatibility version 1.0.0, current
version 1.2.2)

/System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 222.0.0)

/System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos (compatibility version 5.0.0, current version 5.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0,
current version 88.0.0)
clvrmnky@Swizzle:~ #
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From Newsgroup: comp.sys.mac.system

I ran the gdb command but don't know enough to interpret the output:


GuardMalloc[ssh-1817]: Tried to free pointer at 0xaa5bddd0 which is not currently a pointer to a malloc buffer.
GuardMalloc[ssh-1817]: Explicitly trapping into debugger!!!

Program received signal SIGTRAP, Trace/breakpoint trap.
0x9a5be88c in GMfree ()


Repairing Permissions didn't do anything. I looked at the libraries
that the "otool" command gave me and compared my office computer (which
gives the error) and my iBook (which doesn't). The /usr/lib libraries
appear to be identical (same size) as does the /System/Library/Frameworks/Kerberos.framework libraries, but the /System/Library/Frameworks/Security.framework libraries on the two
computers appear to be different:


ibook% ls -l
/System/Library/Frameworks/Security.framework/Versions/A/Security
-rwxr-xr-x 1 root wheel 3187664 Apr 3 19:35 /System/Library/Frameworks/Security.framework/Versions/A/Security*

office% ls -l
/System/Library/Frameworks/Security.framework/Versions/A/Security
-rwxr-xr-x 1 root wheel 3111108 Apr 7 09:40 /System/Library/Frameworks/Security.framework/Versions/A/Security*


Could this be where the problem is?

Thanks for your help!



In article <AUuZf.17393$43.16348@nnrp.ca.mci.com!nnrp1.uunet.ca>, void
* clvrmnky <clvrmnky.invalid@hotmail.com.invalid> wrote:

Otherwise, the usual incantations apply: see if perhaps a softlinked
library is wrong by running Repair Permissions. A bit of a hail-mary, I know. If no other apps or commands also cause this warning, and/or
Repair Perms does not help, it may be time to look at the specific
libraries that ssh uses.

otool -L /usr/bin/ssh will give you a list of dynamic libs and their versions. It should look something like this:

clvrmnky@Swizzle:~ # otool -L /usr/bin/ssh
/usr/bin/ssh:
/usr/lib/libcrypto.0.9.7.dylib (compatibility version 0.9.7, current version 0.9.7)
/usr/lib/libbsm.dylib (compatibility version 1.0.0, current
version 1.0.0)
/usr/lib/libz.1.dylib (compatibility version 1.0.0, current
version 1.2.2)

/System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 222.0.0)

/System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos (compatibility version 5.0.0, current version 5.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0,
current version 88.0.0)
clvrmnky@Swizzle:~ #

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