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From: "sliwa at ifpan dot edu.pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/105769] New: program segmentation fault with
 -ftree-vectorize and nested lambdas
Date: Sun, 29 May 2022 21:24:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105769

            Bug ID: 105769
           Summary: program segmentation fault with -ftree-vectorize and
                    nested lambdas
           Product: gcc
           Version: 11.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sliwa at ifpan dot edu.pl
  Target Milestone: ---

Created attachment 53050
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53050&action=3Dedit
sample program demonstrating undefined behavior

The attached program triggers undefined behavior with g++ (the resulting bi=
nary
segfaults in the manager code of a functor wrapper) when compiled as follows
(minimal flags to trigger):

g++ -flto -O1 -ftree-vectorize tst.cc

This may be related to memory alignment of data (I see a crash with long
double, but not with double). Other things to check is the capture of funct=
or
est in program line 57 (adding an ampersand eliminates the issue). Even
changing the data in lines 81-82 (for example to 0) affects the outcome.

Platform: amd64, RHEL or Gentoo Linux.=