Hi Ben, Many thanks for taking the trouble to reproduce this. On 8 January 2018 at 15:44, Ben Coman <btc@openinworld.com> wrote:

On 7 January 2018 at 20:38, Alistair Grant <akgrant0710@gmail.com> wrote:

...

Hi Ben,

On 7 January 2018 at 05:22, Ben Coman <btc@openinworld.com> wrote:

...

Ubuntu 16.04 64bit Build information: Pharo-7.0+alpha.build.409.sha.bb4eaaf976e3fb148b33b6d87598022b77329768 (64 Bit) Virtual Machine: Pharo64/lib/pharo/5.0-201712211450/pharo

I've mostly ignored 64 bit Pharo because I can't get Iceberg stable enough. Since you're also using Ubuntu 16.04, could I ask you to try (obviously somewhere it is OK to crash the vm :-)):

Now first up, is it just Ubuntu 16.04 with this problem? Can other Linux users report what they get for this?

...

| pharoRepository |

Iceberg enableMetacelloIntegration: true. Metacello new repository: 'github://akgrant43/pharo-akgosprocess/mc'; baseline: 'AKGOSProcess'; load. pharoRepository := IceRepository registry detect: [ :each | each name = 'pharo-akgosprocess' ]. pharoRepository pull.

And let me know the result. I get:

pharo: malloc.c:2394: sysmalloc: Assertion `(old_top == initial_top (av) && old_size == 0) || ((unsigned long) (old_size) >= MINSIZE && prev_inuse (old_top) && ((unsigned long) old_end & (pagesize - 1)) == 0)' failed. /snap/pharo7/x1/usr/bin/pharo: line 43: 21304 Aborted (core dumped) $pharoexe $origargs

Downloaded and unzipped... http://files.pharo.org/vm/pharo-spur64/linux/pharo-linux-x86_64threaded-2017... http://files.pharo.org/image/70/Pharo-7.0.0-alpha.build.412.sha.2e40948.arch...

Ran your script and Pharo crashed with the following in the console shell...

https://github.com/OpenSmalltalk/opensmalltalk-vm/releases/tag/r3732#linux pharo: malloc.c:2394: sysmalloc: Assertion `(old_top == initial_top (av) && old_size == 0) || ((unsigned long) (old_size) >= MINSIZE && prev_inuse (old_top) && ((unsigned long) old_end & (pagesize - 1)) == 0)' failed. Aborted (core dumped)

Also, anther case... Tools > Iceberg > Clone repository Remote url = git@github.com:bencoman/pharo.git Local directory = /home/ben/Apps/Pharo64/pharo-local/iceberg Code sub directory = src clicked <Create Repository> After "pharo master" row appears, right-clicked on "pharo" and clicked <Synchronise> added a comment and clicked <Commit on master> and Pharo crashed with the following on console...

*** Error in `./lib/pharo/5.0-201712211450/pharo': corrupted size vs. prev_size: 0x00007fe23c020120 *** ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7fe241a407e5] /lib/x86_64-linux-gnu/libc.so.6(+0x7e9dc)[0x7fe241a479dc] /lib/x86_64-linux-gnu/libc.so.6(+0x82246)[0x7fe241a4b246] /lib/x86_64-linux-gnu/libc.so.6(__libc_calloc+0xba)[0x7fe241a4ddca] ./lib/pharo/5.0-201712211450/libgit2.so(+0x6cd9e)[0x7fe23cc77d9e] ./lib/pharo/5.0-201712211450/libgit2.so(+0x6eda2)[0x7fe23cc79da2] ./lib/pharo/5.0-201712211450/libgit2.so(git_diff_tree_to_tree+0x224)[0x7fe23cc55461] ./lib/pharo/5.0-201712211450/pharo[0x4c947e] ./lib/pharo/5.0-201712211450/pharo[0x457c27] ./lib/pharo/5.0-201712211450/pharo[0x459c97] ./lib/pharo/5.0-201712211450/pharo(ceSendsupertonumArgs+0x25c)[0x45ba9c] [0xf00100]

I get the same crash dump if I follow the steps you detailed above. My C debugging skills have accumulated more than 20 years of rust and debris, but I'm almost at the point where I'll try building a debug version of the VM and have a look at this. Thanks again, Alistair