Tracing bug

1 files changed, 15 insertions, 0 deletions

diff --git a/isa/BUGS b/isa/BUGS
index 068e7fa9..b874a599 100644
--- a/isa/BUGS
+++ b/isa/BUGS
@@ -5,6 +5,21 @@
 See also ../BUGS for generic bugs.
 
 
+** Issues with tracing mode 
+
+1. Large volumes of output can cause Emacs to hog CPU spending
+all its time processing the output (esp with fontifying and X-symbol
+decoding).   It becomes difficult to use normal editing commands,
+even C-c C-c to interrupt the prover.  Workaround: hitting C-g,
+the Emacs quit key, will interrupt the prover in this state.
+See manual for further description of this.
+
+2. Interrupt response may be lost in large volumes of output, when
+using pty communication.  Symptom is interrupt on C-g, but PG thinks
+the prover is still busy.  Workaround: hit return in the shell buffer,
+or set proof-shell-process-connection-type to nil to use piped
+communication.
+
 ** set proof_timing is problematic
 
 It will make the goals display disappear during proof.  This is