Debian Bug report logs - #1104745
gcc-15 ICE compiling linux kernel 6.14.5 with CONFIG_RANDSTRUCT

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Message #5 received at [email protected] (full text, mbox, reply):

From: Ingo Saitz <[email protected]>

To: Debian Bug Tracking System <[email protected]>

Subject: gcc-15 ICE compiling linux kernel 6.14.5 with CONFIG_RANDSTRUCT

Date: Mon, 05 May 2025 17:40:57 +0200

[Message part 1 (text/plain, inline)]

Package: gcc-15
Version: 15.1.0-3
Severity: normal

Dear Maintainer,

When compiling the linux kernel (tested on 6.15-rc5 and 6.14.5 from
kernel.org) with CONFIG_RANDSTRUCT enabled, gcc-15 throws an ICE:

arch/x86/kernel/cpu/proc.c:174:14: internal compiler error: in comptypes_check_enum_int, at c/c-typeck.cc:1516
  174 | const struct seq_operations cpuinfo_op = {
      |              ^~~~~~~~~~~~~~

I have attached a minmal config for 6.14.5 (make allnoconfig and then
enable CONFIG_RANDSTRUCT_PERFORMANCE) that exibits this behaviour plus
the full dump produced by gcc-15 -freport-bug. I build the kernel with

    make CC="gcc-15 -freport-bug" HOSTCC=gcc-15 V=1

Also CONFIG_RANDSTRUCT_FULL produces the same dump, the only
difference being the option
"-fplugin-arg-randomize_layout_plugin-performance-mode" left out.

The same config build on gcc-14 (Debian 14.2.0-19) 14.2.0 without ICE.

Thanks
    Ingo

-- System Information:
Distributor ID:	Devuan
Description:	Devuan GNU/Linux 6 (excalibur/ceres)
Release:	6
Codename:	excalibur ceres
Architecture: x86_64

Kernel: Linux 6.14.2-spatz20250410 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND, TAINT_OOT_MODULE, TAINT_RANDSTRUCT
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages gcc-15 depends on:
ii  binutils                 2.44-3
ii  cpp-15                   15.1.0-3
ii  gcc-15-base              15.1.0-3
ii  gcc-15-x86-64-linux-gnu  15.1.0-3

Versions of packages gcc-15 recommends:
ii  libc6-dev  2.41-7

Versions of packages gcc-15 suggests:
pn  gcc-15-doc       <none>
pn  gcc-15-locales   <none>
pn  gcc-15-multilib  <none>

-- no debconf information

[config (text/plain, attachment)]

[arch_x86_kernel_cpu_proc.out (text/plain, attachment)]

Message #10 received at [email protected] (full text, mbox, reply):

From: Ingo Saitz <[email protected]>

To: [email protected]

Subject: Re: Bug#1104745: Acknowledgement (gcc-15 ICE compiling linux kernel 6.14.5 with CONFIG_RANDSTRUCT)

Date: Fri, 9 May 2025 09:13:37 +0200

[Message part 1 (text/plain, inline)]

I can build the Linux 6.14.5 kernel with CONFIG_RANDSTRUCT_PERFORMANCE
successfully using upstream gcc 15.1.0, so the bug seems to be
introduced by some of Debians patches (or pulls from upstream
development). See attached build.log and minimal config.

    Ingo
-- 
const_cast<long double>(Λ)

[build.log (application/octet-stream, attachment)]

[config (text/plain, attachment)]

Message #15 received at [email protected] (full text, mbox, reply):

From: Matthias Klose <[email protected]>

To: [email protected], Ingo Saitz <[email protected]>

Subject: Re: Bug#1104745: Acknowledgement (gcc-15 ICE compiling linux kernel 6.14.5 with CONFIG_RANDSTRUCT)

Date: Mon, 12 May 2025 14:25:24 +0200

Control: tags -1 + moreinfo

from the attached preprocessed source ...

please can you report the issue, where you got this plugin from?

// gcc version 15.1.0 (Debian 15.1.0-3)
//
// *** WARNING *** there are active plugins, do not report this as a bug 
unless you can reproduce it without enabling any plugins.
// Event                            | Plugins
// PLUGIN_FINISH_TYPE               | randomize_layout_plugin
// PLUGIN_FINISH_DECL               | randomize_layout_plugin
// PLUGIN_ATTRIBUTES                | randomize_layout_plugin
// PLUGIN_ALL_IPA_PASSES_START      | randomize_layout_plugin
// arch/x86/kernel/cpu/proc.c:174:14: internal compiler error: in 
comptypes_check_enum_int, at c/c-typeck.cc:1516
//   174 | const struct seq_operations cpuinfo_op = {
//       |              ^~~~~~~~~~~~~~
// 0x1cf8479 internal_error(char const*, ...)
// 	../../src/gcc/diagnostic-global-context.cc:517
// 0x1cf85eb fancy_abort(char const*, int, char const*)
// 	../../src/gcc/diagnostic.cc:1749
// 0x750e68 comptypes_check_enum_int(tree_node*, tree_node*, bool*)
// 	../../src/gcc/c/c-typeck.cc:1516
// 0x750e68 comptypes_check_enum_int(tree_node*, tree_node*, bool*)
// 	../../src/gcc/c/c-typeck.cc:1510
// 0x24161fd diagnose_mismatched_decls
// 	../../src/gcc/c/c-decl.cc:2170
// 0x24148ff duplicate_decls
// 	../../src/gcc/c/c-decl.cc:3169
// 0x1d93668 pushdecl(tree_node*)
// 	../../src/gcc/c/c-decl.cc:3376
// 0x1df85c4 start_decl(c_declarator*, c_declspecs*, bool, tree_node*, 
bool, unsigned long*)
// 	../../src/gcc/c/c-decl.cc:5773
// 0x2409a09 c_parser_declaration_or_fndef
// 	../../src/gcc/c/c-parser.cc:2846
// 0x2408fbc c_parser_external_declaration
// 	../../src/gcc/c/c-parser.cc:2105
// 0x2405314 c_parser_translation_unit
// 	../../src/gcc/c/c-parser.cc:1959
// 0x2405314 c_parse_file()
// 	../../src/gcc/c/c-parser.cc:29790
// 0x240237d c_common_parse_file()
// 	../../src/gcc/c-family/c-opts.cc:1379

Message #22 received at [email protected] (full text, mbox, reply):

From: Ingo Saitz <[email protected]>

To: Matthias Klose <[email protected]>

Cc: [email protected]

Subject: Re: Bug#1104745: Acknowledgement (gcc-15 ICE compiling linux kernel 6.14.5 with CONFIG_RANDSTRUCT)

Date: Mon, 12 May 2025 18:21:08 +0200

On Mon, May 12, 2025 at 02:25:24PM +0200, Matthias Klose wrote:
> Control: tags -1 + moreinfo
> 
> from the attached preprocessed source ...
> 
> please can you report the issue, where you got this plugin from?

The plugin is part of the linux kernel compilation process to randomize
structure layout. This plugin was from vanilla 6.14.5 linux kernel sources,
in scripts/gcc-plugins/randomize_layout_plugin.c . It gets build and used
automatically when CONFIG_RANDSTRUCT_PERFORMANCE (or _FULL) is enabled.

    Ingo
-- 
const_cast<long double>(Λ)

Message #27 received at [email protected] (full text, mbox, reply):

From: Matthias Klose <[email protected]>

To: Ingo Saitz <[email protected]>

Cc: [email protected]

Subject: Re: Bug#1104745: Acknowledgement (gcc-15 ICE compiling linux kernel 6.14.5 with CONFIG_RANDSTRUCT)

Date: Tue, 13 May 2025 10:33:09 +0200

Control: reassign -1 src:linux

On 12.05.25 18:21, Ingo Saitz wrote:
> On Mon, May 12, 2025 at 02:25:24PM +0200, Matthias Klose wrote:
>> Control: tags -1 + moreinfo
>>
>> from the attached preprocessed source ...
>>
>> please can you report the issue, where you got this plugin from?
> 
> The plugin is part of the linux kernel compilation process to randomize
> structure layout. This plugin was from vanilla 6.14.5 linux kernel sources,
> in scripts/gcc-plugins/randomize_layout_plugin.c . It gets build and used
> automatically when CONFIG_RANDSTRUCT_PERFORMANCE (or _FULL) is enabled.
> 
>      Ingo

according to GCC upstream developers, this should be forwarded upstream 
for linux.

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