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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113724] [14 Regression][OpenMP] ICE (segfault) when mapping a struct in omp_gather_mapping_groups_1
Date: Wed, 07 Feb 2024 18:51:28 +0000	[thread overview]
Message-ID: <bug-113724-4-WZhGnQk8hz@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-113724-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113724

--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Inside omp_build_struct_sibling_lists, the following assignment:

11654           grp->grp_start = new_next;

has on the LHS the [3] array with value:

(gdb) p *grp
$147 = {grp_start = 0x7ffff71f9688, grp_end = 0x7ffff71f9630, mark = UNVISITED,
deleted = true, reprocess_struct = false, fragile = false, sibling = 0x0, next
= 0x0}

while

(gdb) p new_next
$146 = (tree *) 0x7ffff71f96d0

which causes the alias issue we are seeing. Before the assignment:

(gdb) p debug(*(tree*)0x7ffff71f9688)
map(tofrom:S1.b) map(tofrom:S1.p) map(tofrom:*S1.p [len: 400])
map(attach_detach:S1.p [bias: 0])

(gdb) p debug(*(tree*)0x7ffff71f96d0)
map(tofrom:S1.p) map(tofrom:*S1.p [len: 400]) map(attach_detach:S1.p [bias: 0])

  parent reply	other threads:[~2024-02-07 18:51 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-02 15:39 [Bug middle-end/113724] New: " burnus at gcc dot gnu.org
2024-02-05  8:51 ` [Bug middle-end/113724] " rguenth at gcc dot gnu.org
2024-02-06 12:04 ` burnus at gcc dot gnu.org
2024-02-07 18:21 ` burnus at gcc dot gnu.org
2024-02-07 18:51 ` burnus at gcc dot gnu.org [this message]
2024-02-10 11:51 ` burnus at gcc dot gnu.org
2024-02-10 18:08 ` burnus at gcc dot gnu.org
2024-02-13 10:40 ` burnus at gcc dot gnu.org
2024-03-07 20:42 ` law at gcc dot gnu.org
2024-03-26 10:52 ` rguenth at gcc dot gnu.org
2024-03-26 10:58 ` rguenth at gcc dot gnu.org
2024-04-18 15:23 ` [Bug middle-end/113724] [14 Regression][OpenMP] ICE (segfault) when mapping a struct in omp_gather_mapping_groups_1 since r14-6515 jakub at gcc dot gnu.org
2024-04-26  8:41 ` jakub at gcc dot gnu.org
2024-05-07  7:44 ` [Bug middle-end/113724] [14/15 " rguenth at gcc dot gnu.org

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