1500862 – DW_AT_decl_file and DW_AT_decl_line incorrectly generated

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Bug 1500862 - DW_AT_decl_file and DW_AT_decl_line incorrectly generated

Summary: DW_AT_decl_file and DW_AT_decl_line incorrectly generated

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Fedora
Classification:	Fedora
Component:	gcc
Sub Component:
Version:	26
Hardware:	Unspecified
OS:	Linux
Priority:	unspecified
Severity:	unspecified
Target Milestone:	---
Assignee:	Jakub Jelinek
QA Contact:	Fedora Extras Quality Assurance
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2017-10-11 15:34 UTC by Yauheni Kaliuta
Modified:	2018-02-06 15:32 UTC (History)
CC List:	9 users (show)
Fixed In Version:	gcc-7.3.1-2.fc26 gcc-7.3.1-2.fc27
Doc Type:	If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed:	2018-02-06 10:51:05 UTC
Type:	Bug
Embargoed:
Dependent Products:

Attachments	(Terms of Use)
Preprocessed source (2.15 MB, text/plain) 2017-10-11 16:23 UTC, Yauheni Kaliuta	no flags	Details
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Links
System	ID	Private	Priority	Status	Summary	Last Updated
GNU Compiler Collection	83550	0	None	None	None	2018-01-01 12:42:54 UTC

Description Yauheni Kaliuta 2017-10-11 15:34:56 UTC

Looks like we hit a bug pretty similar to the old one  https://bugzilla.redhat.com/show_bug.cgi?id=1423460

With the current Fedora (26) gcc (gcc (GCC) 7.2.1 20170915 (Red Hat 7.2.1-2)) at least during the kernel build for some symbols in some CUs the attributes point to the forward declaration:

$ readelf --debug-dump kernel/fork.o:

 <1><7ccd>: Abbrev Number: 72 (DW_TAG_structure_type)
    <7cce>   DW_AT_name        : (indirect string, offset: 0x72c4): user_namespace
    <7cd2>   DW_AT_byte_size   : 480
    <7cd4>   DW_AT_decl_file   : 165
    <7cd5>   DW_AT_decl_line   : 17
    <7cd6>   DW_AT_sibling     : <0x7dc6>
...

  165   2       0       0       uidgid.h

The source code is (include/linux/uidgid.h):

14 #include <linux/types.h>
15 #include <linux/highuid.h>
16
17 struct user_namespace;
18 extern struct user_namespace init_user_ns;

(in the final vmlinux it points to the same file)


When with the RHEL gcc it points to include/linux/user_namespace.h:47 (correctly).

Comment 1 Jakub Jelinek 2017-10-11 15:40:04 UTC

Please provide preprocessed source (fork.i) and gcc options used to compile that file.

Comment 2 Yauheni Kaliuta 2017-10-11 16:23:11 UTC

Created attachment 1337297 [details]
Preprocessed source

fork.i generation:

make -f scripts/Makefile.build obj=kernel kernel/fork.i
  gcc -E -Wp,-MD,kernel/.fork.i.d  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/7/include -I./arch/x86/include -Iarch/x86/include/generated  -Iinclude -I./arch/x86/include/uapi -Iarch/x86/include/generated/uapi -I./include/uapi -Iinclude/generated/uapi -include ./include/linux/kconfig.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -std=gnu89 -O2 -m64 -mno-mmx -mno-sse -mpreferred-stack-boundary=3 -mtune=generic -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -Wframe-larger-than=2048 -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1 -DCONFIG_AS_AVX512=1 -DCONFIG_AS_SHA1_NI=1 -DCONFIG_AS_SHA256_NI=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -Wframe-larger-than=2048 -fstack-protector-strong -Wno-unused-but-set-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -g -pg -mfentry -DCC_USING_FENTRY -fno-inline-functions-called-once -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack -DCC_HAVE_ASM_GOTO    -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(fork)"  -D"KBUILD_MODNAME=KBUILD_STR(fork)" -o kernel/fork.i kernel/fork.c


fork.o generation

make -f scripts/Makefile.build obj=kernel kernel/fork.o
  gcc -Wp,-MD,kernel/.fork.o.d  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/7/include -I./arch/x86/include -Iarch/x86/include/generated  -Iinclude -I./arch/x86/include/uapi -Iarch/x86/include/generated/uapi -I./include/uapi -Iinclude/generated/uapi -include ./include/linux/kconfig.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -std=gnu89 -O2 -m64 -mno-mmx -mno-sse -mpreferred-stack-boundary=3 -mtune=generic -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -Wframe-larger-than=2048 -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1 -DCONFIG_AS_AVX512=1 -DCONFIG_AS_SHA1_NI=1 -DCONFIG_AS_SHA256_NI=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -Wframe-larger-than=2048 -fstack-protector-strong -Wno-unused-but-set-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -g -pg -mfentry -DCC_USING_FENTRY -fno-inline-functions-called-once -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack -DCC_HAVE_ASM_GOTO    -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(fork)"  -D"KBUILD_MODNAME=KBUILD_STR(fork)" -c -o kernel/.tmp_fork.o kernel/fork.c
  if [ "-pg" = "-pg" ]; then if [ kernel/fork.o != "scripts/mod/empty.o" ]; then ./scripts/recordmcount  "kernel/fork.o"; fi; fi;

Comment 3 Fedora Update System 2018-01-31 07:49:55 UTC

gcc-7.3.1-2.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2018-75d88970d0

Comment 4 Fedora Update System 2018-01-31 07:56:19 UTC

gcc-7.3.1-2.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-aa879be08e

Comment 5 Fedora Update System 2018-01-31 18:43:30 UTC

gcc-7.3.1-2.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-aa879be08e

Comment 6 Fedora Update System 2018-01-31 22:46:23 UTC

gcc-7.3.1-2.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-75d88970d0

Comment 7 Fedora Update System 2018-02-06 10:51:05 UTC

gcc-7.3.1-2.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2018-02-06 15:32:30 UTC

gcc-7.3.1-2.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.

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