On Jul 29, 2025, at 1:18 PM, Pip Cet <pipcet@protonmail.com> wrote:

"Sean Devlin" <spd@toadstyle.org> writes:

Hi folks,

I left Emacs idle overnight, and I found a crash log when I returned in
the morning. Please see the attached file.

I'm using the IGC branch, and it looks like a related assertion failed.

I have igc-step-interval set to 0.05, but no other configuration related to GC.

I don’t know how to reproduce the error.

Thanks!

Thanks for the report. I'm afraid we don't have very much to go on: this
assertion in trace.c in MPS failed:

   AVER(RefSetSub(ScanStateUnfixedSummary(ss), SegSummary(seg))); /* <design/check/#.common> */

I think that means a memory structure internal to MPS must have been
corrupted; either the ScanState on the stack, or the segment
information.

A core dump might help us figure out more, but I don't think there is
one, right?

Pip