Segmentation Fault in Sandbox

[gatoWololo]

Hello, I'm trying to use the sandbox. When running it on a very simple bash script it seems to segfault once in a while, but not every time. ./sandbox /lib64/ld-linux-x86-64.so.2 /bin/bash breakWithShell.sh

breakWithShell.sh:

#!/bin/bash
/bin/bash ./breakWithShell2.sh
wait

breakWithShell2.sh:

#!/bin/bash
echo "Hello from child shell!"

Error: ./sandbox /lib64/ld-linux-x86-6…” terminated by signal SIGSEGV (Address boundary error).

From /var/log/kern.log:

kernel: [ 1437.685581] sandbox[2215]: segfault at ffffffffffffff78 ip 0000000070005a0e sp ffffffffffffff80 error 7 in sandbox[70000000+f000]

The instruction pointer points to __dune_retry as expected.

Running it multiple times under gdb I can eventually cause an ever worse error that creates an unkillable process. The OS refuses to restart and a hard reset on the computer is required.

The /var/long/kern.log output is pretty long (attached).

This is a minimal example of this bug that I have witnessed in other places as well. Any feedback on what might be causing the bug is greatly appreciated.

kernelBug.txt

[kkaffes]

Unfortunately, I haven't been able to reproduce your error on my machine. What do you mean by once in a while?

[gatoWololo]

The command won't always segfault, it segfaults about half the time? The half it runs just fine. I'm using Kernel Version 4.4.1

I'll keep digging into it. I'll post anything I find.