Original bug ID: 7168
Reporter: @jhjourdan
Status: closed (set by @damiendoligez on 2016-04-15T09:30:00Z)
Resolution: fixed
Priority: normal
Severity: crash
Platform: amd64
OS: Linux
Version: 4.03.0+dev / +beta1
Target version: 4.03.0+dev / +beta1
Fixed in version: 4.03.0+dev / +beta1
Category: runtime system and C interface

Bug description

When compiling and running the attached program in bytecode mode, I get a libc error (free(): invalid pointer).

The reason is that the interpreter stack is exceeded without being reallocated. The estimation of stack usage computed in bytegen.ml is too optimistic in some cases. The situation is even worsened by Setup_for_event, which can use up to 6 stack slots at any time.

I can see two solutions: either we implement a precise stack usage approximation, but this can be difficult to take into account all the situations, or I suggest using a large security margin when allocation the stack buffer (e.g. 1k word).

File attachments

• bug.ml