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From: "jbglaw@lug-owl.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug regression/107997] New: fd8dd6c03849691 probably uncovered an
 issue building the Linux kernel
Date: Tue, 06 Dec 2022 22:24:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107997

            Bug ID: 107997
           Summary: fd8dd6c03849691 probably uncovered an issue building
                    the Linux kernel
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jbglaw@lug-owl.de
  Target Milestone: ---

Hi!

Starting with commit fd8dd6c0384969170e594be34da278a072d5eb76, I see
Linux kernel build errors for the skiroot_defconfig:

[mk all 2022-12-05 19:50:10]   powerpc64-linux-gcc
-Wp,-MMD,drivers/dma-buf/.dma-fence-array.o.d -nostdinc
-I./arch/powerpc/include -I./arch/powerpc/include/generated  -I./include
-I./arch/po
werpc/include/uapi -I./arch/powerpc/include/generated/uapi -I./include/uapi
-I./include/generated/uapi -include ./include/linux/compiler-version.h -inc=
lude
./include/linux/kconfig.h -include=20
./include/linux/compiler_types.h -D__KERNEL__ -I ./arch/powerpc
-DHAVE_AS_ATHIGH=3D1 -fmacro-prefix-map=3D./=3D -Wall -Wundef
-Werror=3Dstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-comm
on -fshort-wchar -fno-PIE -Werror=3Dimplicit-function-declaration
-Werror=3Dimplicit-int -Werror=3Dreturn-type -Wno-format-security -std=3Dgn=
u11
-mlittle-endian -m64 -msoft-float -pipe -mtraceback=3Dno
 -mabi=3Delfv2 -mcmodel=3Dmedium -mno-pointers-to-nested-functions -mcpu=3D=
power8
-mtune=3Dpower10 -mno-prefixed -mno-pcrel -mno-altivec -mno-vsx -mno-mma
-fno-asynchronous-unwind-tables -mno-string=20
-Wa,-maltivec -Wa,-mpower4 -Wa,-many -mno-strict-align -mlittle-endian
-mstack-protector-guard=3Dtls -mstack-protector-guard-reg=3Dr13
-fno-delete-null-pointer-checks -Wno-frame-address -Wno-form
at-truncation -Wno-format-overflow -Wno-address-of-packed-member -Os
-fno-allow-store-data-races -Wframe-larger-than=3D2048 -fstack-protector-st=
rong
-Wno-main -Wno-unused-but-set-variable -Wno-
unused-const-variable -Wno-dangling-pointer -fomit-frame-pointer
-ftrivial-auto-var-init=3Dzero -fno-stack-clash-protection
-Wdeclaration-after-statement -Wvla -Wno-pointer-sign -Wcast-function
-type -Wno-stringop-truncation -Wno-stringop-overflow -Wno-restrict
-Wno-maybe-uninitialized -Wno-alloc-size-larger-than -Wimplicit-fallthrough=
=3D5
-fno-strict-overflow -fno-stack-check -fconse
rve-stack -Werror=3Ddate-time -Werror=3Dincompatible-pointer-types
-Werror=3Ddesignated-init -Wno-packed-not-aligned
-mstack-protector-guard-offset=3D2800=20=20=20
-DKBUILD_MODFILE=3D'"drivers/dma-buf/dma-fe
nce-array"' -DKBUILD_BASENAME=3D'"dma_fence_array"'
-DKBUILD_MODNAME=3D'"dma_fence_array"' -D__KBUILD_MODNAME=3Dkmod_dma_fence_=
array -c
-o drivers/dma-buf/dma-fence-array.o drivers/dma-buf/dma-fenc
e-array.c=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10] drivers/dma-buf/dma-fence-array.c: In function
'dma_fence_array_create':=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10] drivers/dma-buf/dma-fence-array.c:154:25: erro=
r:
control flow in the middle of basic block 12=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20
[mk all 2022-12-05 19:50:10]   154 | struct dma_fence_array
*dma_fence_array_create(int num_fences,=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
[mk all 2022-12-05 19:50:10]       |=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
^~~~~~~~~~~~~~~~~~~~~~=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10] during GIMPLE pass: ivopts=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10] drivers/dma-buf/dma-fence-array.c:154:25: inte=
rnal
compiler error: verify_flow_info failed=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
[mk all 2022-12-05 19:50:10] 0x19ea876 internal_error(char const*, ...)=20=
=20=20=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10]    ???:0=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10] 0x94b00e verify_flow_info()=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10]    ???:0=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10] Please submit a full bug report, with preproce=
ssed
source (by using -freport-bug).=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20
[mk all 2022-12-05 19:50:10] Please include the complete backtrace with any=
 bug
report.=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20
[mk all 2022-12-05 19:50:10] See <https://gcc.gnu.org/bugs/> for instructio=
ns.=20=20


(Cf. https://gcc.gnu.org/pipermail/gcc-patches/2022-December/607874.html)

I'll add the preprocessed sources.=