Unwind fails on Win32/x86

Bug #1072739 reported by David Lichteblau on 2012-10-29
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

The attached test case fails on Win32/x86 (on both SBCL's master branch and the unofficial Windows branch, but not on Win32/amd64). Presumably amd64 is unaffected because it doesn't do anything fancy with SEH and RtlUnwind at all.

The problem is a regression introduced somewhere between SBCL 1.0 and 1.0.2, and looking at changes in those versions, likely/possibly in or

Possible approaches:

  1. just remove all our SEH tricks -- doing so would be a simplification and would bring x86 in line with amd64

  2. Or is this the "well-known" ordering problem? If so, how can we fix it?

Thanks to Elliott Slaughter for the report.


(load "test-form-1.lisp")

;;; [... legitimate warnings pruned from output... ]

debugger invoked on a SIMPLE-ERROR in thread
#<THREAD "main thread" RUNNING {23ED1979}>:
  An exception occurred in context #.(SB-SYS:INT-SAP #X0022E270): #.(SB-SYS:INT-
SAP #X0022E3A0). (Exception code: 3221225513)

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

Paul Khuong (pvk) on 2013-06-28
Changed in sbcl:
status: New → In Progress
assignee: nobody → Paul Khuong (pvk)
importance: Undecided → Medium
Paul Khuong (pvk) wrote :

Should be fixed in ba39d16 (Pack (mostly) stack TNs according to lexical scope information).

Changed in sbcl:
status: In Progress → Fix Committed
assignee: Paul Khuong (pvk) → nobody
Paul Khuong (pvk) wrote :

I don't have access to a windows box, but I've had confirmation that ordering catch blocks correctly fixes the issue (well, at least, the test case here).

Changed in sbcl:
status: Fix Committed → Fix Released
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