Re: [PATCH v5 0/8] unwind, arm64: add sframe unwinder for kernel
Brian Norris <[email protected]> Wed, 15 Jul 2026 09:20:55 -0700
| Newsgroups | org.kernel.vger.linux-toolchains,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel,org.kernel.vger.live-patching |
|---|---|
| Message-ID | <[email protected]> |
Hi Jens,
Thanks for looking! Lots more output below. Feel free to ask for more
info you tink could help.`
On Wed, Jul 15, 2026 at 10:06:20AM +0200, Jens Remus wrote:
> On 7/14/2026 2:28 AM, Brian Norris wrote:
> > On Tue, May 19, 2026 at 01:05:23PM +0200, Jens Remus wrote:
>=20
> > I also work at the same company as Dylan and Mostafa, and am therefore
> > probably using the same company-maintained Linux distribution.
> >=20
> >> On 5/18/2026 7:55 PM, Dylan Hatch wrote:
> >>> On Fri, May 15, 2026 at 4:32=E2=80=AFAM Mostafa Saleh <smostafa@googl=
e.com> wrote:
> >>>> Not sure if related, but after updating my toolchain
> >>>> (aarch64-linux-gnu-gcc (Debian 15.2.0-4) 15.2.0), I hit link errors:
> >>>> ld.lld: error: arch/arm64/kernel/vdso/vgettimeofday.o:(.sframe) is b=
eing placed in '.sframe'
> >>>> ld.lld: error: arch/arm64/kernel/vdso/vgetrandom.o:(.sframe) is bein=
g placed in '.sframe`
>=20
> My understanding of above message is that the linker complains that the
> input object (e.g. vgettimeofday.o) has an .sframe section for which
> the linker script does not have any rule, so that it defaults to place
> it in .sframe in the output, which could not be the desired result.
Not sure if it's obvious to you, but I also found a few more details:
* This is most noticeable with CONFIG_WERROR=3Dy, which turns the linker
warning into an error.
* It appears both with LD=3Dld.lld and with the default (bfd linker). bfd
shows:
/usr/bin/aarch64-linux-gnu-ld.bfd: error: unplaced orphan section `.sframe'=
from `arch/arm64/kernel/vdso/vgettimeofday.o'
/usr/bin/aarch64-linux-gnu-ld.bfd: error: unplaced orphan section `.sframe'=
from `arch/arm64/kernel/vdso/vgetrandom.o'
Otherwise, I don't have to do much special to hit this. Just
cross-compile ARCH=3Darm64 defconfig.
> > I've also been hitting this for some time, and I'd like to see if I can
> > figure out what's going wrong. My current workaround is:
> >=20
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -946,6 +946,8 @@ ifdef CONFIG_CC_IS_GCC
> > KBUILD_CFLAGS +=3D $(call cc-option,--param=3Dallow-store-data-races=
=3D0)
> > KBUILD_CFLAGS +=3D $(call cc-option,-fno-allow-store-data-races)
> > endif
> > +# No sframe generation for kernel if enabled by default
> > +KBUILD_CFLAGS +=3D $(call cc-option,-Xassembler --gsframe=3Dno)
> > =20
> > ifdef CONFIG_READABLE_ASM
> > # Disable optimizations that make assembler listings hard to read.
> >=20
> >>> Previously when developing against the SFrame V2 format, I had fixed
> >>> these warnings with the VDSO Makefile change currently in this series:
> >>>
> >>> diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso=
/Makefile
> >>> index 7dec05dd33b7..c60ef921956f 100644
> >>> --- a/arch/arm64/kernel/vdso/Makefile
> >>> +++ b/arch/arm64/kernel/vdso/Makefile
> >>> @@ -38,7 +38,7 @@ ccflags-y +=3D -DDISABLE_BRANCH_PROFILING -DBUILD_V=
DSO
> >>> CC_FLAGS_REMOVE_VDSO :=3D $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) \
> >>> $(RANDSTRUCT_CFLAGS) $(KSTACK_ERASE_CFLAGS) \
> >>> $(GCC_PLUGINS_CFLAGS) \
> >>> - $(CC_FLAGS_LTO) $(CC_FLAGS_CFI) \
> >>> + $(CC_FLAGS_LTO) $(CC_FLAGS_CFI) $(CC_FLAGS_SF=
RAME) \
> >>> -Wmissing-prototypes -Wmissing-declarations
> >>>
> >>> CC_FLAGS_ADD_VDSO :=3D -O2 -mcmodel=3Dtiny -fasynchronous-unwind-tab=
les
> >>>
> >>> But the warnings seem to have returned after upgrading my toolchain,
> >>> possibly due to SFrame V3 or some confounding change in GCC. The
> >>> --gsframe in the assembler should be set to 'no' by default, so
> >>> perhaps GCC is providing an override --gsframe internally?
> >>
> >> Could it be that your build of binutils was configured with
> >> --enable-default-sframe, so that the GNU assembler defaults to generate
> >> .sframe? AFAIK this configure option was meant for distributors and
> >> package maintainers.
> >>
> >> You can check as follows whether --gsframe defaults to "no" or "yes":
> >>
> >> $ as --help | grep -A1 gsframe
> >> --gsframe[=3D{no|yes}] whether to generate SFrame stack trace inf=
ormation
> >> (default: no)
> >> ...
> >=20
> > $ aarch64-linux-gnu-as --help | grep -A1 gsframe
> > --gsframe[=3D{no|yes}] whether to generate SFrame stack trace info=
rmation
> > (default: no)
> > --
> > --gsframe-<N> generate SFrame version <N> information. 3 =
=3D=3D <N>
> > --scfi=3Dexperimental Synthesize DWARF CFI for hand-written asm
> >=20
> >> Maybe build the VDSO separately with V=3D1 to see what assembler/compi=
ler
> >> options are effectively used (e.g. for vgettimeofday.o and vgetrandom.o
> >> mentioned in the linker error message above)?
> >=20
> > A slightly tweaked version of my vgetrandom.o build line:
> >=20
> > # CC arch/arm64/kernel/vdso/vgetrandom.o
> > aarch64-linux-gnu-gcc -Wp,-MMD,arch/arm64/kernel/vdso/.vgetrandom.o.d=
-nostdinc -I./arch/arm64/include -I./arch/arm64/include/generated -I./incl=
ude -I./include -I./arch/arm64/include/uapi -I./arch/arm64/include/generate=
d/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux=
/compiler-version.h -include ./include/linux/kconfig.h -include ./include/l=
inux/compiler_types.h -D__KERNEL__ -mlittle-endian -DCC_USING_PATCHABLE_FUN=
CTION_ENTRY -DKASAN_SHADOW_SCALE_SHIFT=3D -Werror -fshort-wchar -funsigned-=
char -fno-common -fno-PIE -fno-strict-aliasing -std=3Dgnu11 -fms-extensions=
-mgeneral-regs-only -DCONFIG_CC_HAS_K_CONSTRAINT=3D1 -Wno-psabi -mabi=3Dlp=
64 -fno-asynchronous-unwind-tables -fno-unwind-tables -mbranch-protection=
=3Dpac-ret -Wa,-march=3Darmv8.5-a -DARM64_ASM_ARCH=3D'"armv8.5-a"' -DKASAN_=
SHADOW_SCALE_SHIFT=3D -fno-delete-null-pointer-checks -O2 -fno-allow-store-=
data-races -fstack-protector-strong -fno-omit-frame-pointer -fno-optimize-s=
ibling-calls -ftrivial-auto-var-init=3Dzero -fzero-init-padding-bits=3Dall =
-fno-stack-clash-protection -fno-inline-functions-called-once -fmin-functio=
n-alignment=3D8 -fstrict-flex-arrays=3D3 -fno-strict-overflow -fno-stack-ch=
eck -fconserve-stack -fno-builtin-wcslen -Wall -Wextra -Wundef -Werror=3Dim=
plicit-function-declaration -Werror=3Dimplicit-int -Werror=3Dreturn-type -W=
error=3Dstrict-prototypes -Wno-format-security -Wno-trigraphs -Wno-frame-ad=
dress -Wno-address-of-packed-member -Wframe-larger-than=3D2048 -Wno-main -W=
no-type-limits -Wno-dangling-pointer -Wvla-larger-than=3D1 -Wno-pointer-sig=
n -Wcast-function-type -Wno-unterminated-string-initialization -Wno-array-b=
ounds -Wno-stringop-overflow -Wno-alloc-size-larger-than -Wimplicit-fallthr=
ough=3D5 -Werror=3Ddate-time -Werror=3Dincompatible-pointer-types -Werror=
=3Ddesignated-init -Wenum-conversion -Wunused -Wno-unused-but-set-variable =
-Wno-unused-const-variable -Wno-packed-not-aligned -Wno-format-overflow -Wn=
o-format-truncation -Wno-stringop-truncation -Wno-override-init -Wno-missin=
g-field-initializers -Wno-shift-negative-value -Wno-maybe-uninitialized -Wn=
o-sign-compare -Wno-unused-parameter -g -mstack-protector-guard=3Dsysreg -m=
stack-protector-guard-reg=3Dsp_el0 -mstack-protector-guard-offset=3D1344 -f=
no-common -fno-builtin -fno-stack-protector -ffixed-x18 -DDISABLE_BRANCH_PR=
OFILING -DBUILD_VDSO -O2 -mcmodel=3Dtiny -fasynchronous-unwind-tables -incl=
ude ./lib/vdso/getrandom.c -I./arch/arm64/kernel/vdso -Iarch/arm64/kernel=
/vdso -DKBUILD_MODFILE=3D'"arch/arm64/kernel/vdso/vgetrandom"' -DKBUILD_=
BASENAME=3D'"vgetrandom"' -DKBUILD_MODNAME=3D'"vgetrandom"' -D__KBUILD_MODN=
AME=3Dvgetrandom -c -o arch/arm64/kernel/vdso/vgetrandom.o ./arch/arm64/ker=
nel/vdso/vgetrandom.c
>=20
> That command line does not have any --gsframe[-3] (e.g. -Wa,--gsframe).
> I am not aware of any binutils release / repository state where the
> --gsframe default was broken.
FWIW, I'm usually testing on both v7.1 and approx v7.2-rc3, to make sure
my results are consistent, and it's not already somehow fixed.
> @Indu: Do you have any idea what could be going on?
>=20
> > I mostly don't know what I'm looking for w.r.t. gsframe features, but
> > I'm willing to poke at my compiler/assembler/build-process.
>=20
> Could it be that your gcc injects --gsframe e.g. via its spec file?
> Maybe that would show up if you run above command manually and append
> gcc option -v?
I've dumped most of the output below. I see that the 'as' invocation
includes --gsframe, but I'm not sure why.
$ aarch64-linux-gnu-gcc -Wp,-MMD,arch/arm64/kernel/vdso/.vgetrandom.o.d -no=
stdinc -I./arch/arm64/include -I./arch/arm64/include/generated -I./include =
-I./include -I./arch/arm64/include/uapi -I./arch/arm64/include/generated/ua=
pi -I./include/uapi -I./include/generated/uapi -include ./include/linux/com=
piler-version.h -include ./include/linux/kconfig.h -include ./include/linux=
/compiler_types.h -D__KERNEL__ -mlittle-endian -DKASAN_SHADOW_SCALE_SHIFT=
=3D -Werror -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-=
aliasing -std=3Dgnu11 -fms-extensions -mgeneral-regs-only -DCONFIG_CC_HAS_K=
_CONSTRAINT=3D1 -Wno-psabi -mabi=3Dlp64 -fno-asynchronous-unwind-tables -fn=
o-unwind-tables -mbranch-protection=3Dpac-ret -Wa,-march=3Darmv8.5-a -DARM6=
4_ASM_ARCH=3D'"armv8.5-a"' -DKASAN_SHADOW_SCALE_SHIFT=3D -fno-delete-null-p=
ointer-checks -O2 -fno-allow-store-data-races -fstack-protector-strong -fno=
-omit-frame-pointer -fno-optimize-sibling-calls -ftrivial-auto-var-init=3Dz=
ero -fzero-init-padding-bits=3Dall -fno-stack-clash-protection -fmin-functi=
on-alignment=3D4 -fstrict-flex-arrays=3D3 -fno-strict-overflow -fno-stack-c=
heck -fconserve-stack -fno-builtin-wcslen -Wall -Wextra -Wundef -Werror=3Di=
mplicit-function-declaration -Werror=3Dimplicit-int -Werror=3Dreturn-type -=
Werror=3Dstrict-prototypes -Wno-format-security -Wno-trigraphs -Wno-frame-a=
ddress -Wno-address-of-packed-member -Wframe-larger-than=3D2048 -Wno-main -=
Wno-type-limits -Wno-dangling-pointer -Wvla-larger-than=3D1 -Wno-pointer-si=
gn -Wcast-function-type -Wno-unterminated-string-initialization -Wno-array-=
bounds -Wno-stringop-overflow -Wno-alloc-size-larger-than -Wimplicit-fallth=
rough=3D5 -Werror=3Ddate-time -Werror=3Dincompatible-pointer-types -Werror=
=3Ddesignated-init -Wenum-conversion -Wunused -Wno-unused-but-set-variable =
-Wno-unused-const-variable -Wno-packed-not-aligned -Wno-format-overflow -Wn=
o-format-truncation -Wno-stringop-truncation -Wno-override-init -Wno-missin=
g-field-initializers -Wno-shift-negative-value -Wno-maybe-uninitialized -Wn=
o-sign-compare -Wno-unused-parameter -g -fno-var-tracking -femit-struct-deb=
ug-baseonly -mstack-protector-guard=3Dsysreg -mstack-protector-guard-reg=3D=
sp_el0 -mstack-protector-guard-offset=3D1344 -fno-common -fno-builtin -fno-=
stack-protector -ffixed-x18 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO -O2 -mc=
model=3Dtiny -fasynchronous-unwind-tables -include $LINUX/lib/vdso/getrando=
m.c -DKBUILD_MODFILE=3D'"arch/arm64/kernel/vdso/vgetrandom"' -DKBUILD_BA=
SENAME=3D'"vgetrandom"' -DKBUILD_MODNAME=3D'"vgetrandom"' -D__KBUILD_MODNAM=
E=3Dvgetrandom -c -o arch/arm64/kernel/vdso/vgetrandom.o arch/arm64/kernel/=
vdso/vgetrandom.c -v
Using built-in specs.
COLLECT_AS_OPTIONS=3D'-march=3Darmv8.5-a'
COLLECT_GCC=3Daarch64-linux-gnu-gcc
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion=3D'Debian 15.2.0-4' =
--with-bugurl=3Dfile:///usr/share/doc/gcc-15/README.Bugs --enable-languages=
=3Dc,ada,c++,go,d,fortran,objc,obj-c++,m2,cobol,algol68 --prefix=3D/usr --w=
ith-gcc-major-version-only --program-suffix=3D-15 --enable-shared --enable-=
linker-build-id --libexecdir=3D/usr/libexec --without-included-gettext --en=
able-threads=3Dposix --libdir=3D/usr/lib --enable-nls --with-sysroot=3D/ --=
enable-clocale=3Dgnu --enable-libstdcxx-debug --enable-libstdcxx-time=3Dyes=
--with-default-libstdcxx-abi=3Dnew --enable-libstdcxx-backtrace --enable-g=
nu-unique-object --disable-libquadmath --disable-libquadmath-support --enab=
le-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checki=
ng=3Drelease --without-target-system-zlib --enable-multiarch --enable-fix-c=
ortex-a53-843419 --disable-werror --enable-checking=3Drelease --build=3Dx86=
_64-linux-gnu --host=3Dx86_64-linux-gnu --target=3Daarch64-linux-gnu --prog=
ram-prefix=3Daarch64-linux-gnu- --includedir=3D/usr/aarch64-linux-gnu/inclu=
de --with-build-config=3Dbootstrap-lto-lean --enable-link-serialization=3D32
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.2.0 (Debian 15.2.0-4)
COLLECT_GCC_OPTIONS=3D'-nostdinc' '-I' './arch/arm64/include' '-I' './arch/=
arm64/include/generated' '-I' './include' '-I' './include' '-I' './arch/arm=
64/include/uapi' '-I' './arch/arm64/include/generated/uapi' '-I' './include=
/uapi' '-I' './include/generated/uapi' '-include' './include/linux/compiler=
-version.h' '-include' './include/linux/kconfig.h' '-include' './include/li=
nux/compiler_types.h' '-D' '__KERNEL__' '-mlittle-endian' '-D' 'KASAN_SHADO=
W_SCALE_SHIFT=3D' '-Werror' '-fshort-wchar' '-funsigned-char' '-fno-PIE' '-=
fno-strict-aliasing' '-std=3Dgnu11' '-fms-extensions' '-mgeneral-regs-only'=
'-D' 'CONFIG_CC_HAS_K_CONSTRAINT=3D1' '-Wno-psabi' '-mabi=3Dlp64' '-fno-un=
wind-tables' '-mbranch-protection=3Dpac-ret' '-D' 'ARM64_ASM_ARCH=3D"armv8.=
5-a"' '-D' 'KASAN_SHADOW_SCALE_SHIFT=3D' '-fno-delete-null-pointer-checks' =
'-O2' '-fno-allow-store-data-races' '-fstack-protector-strong' '-fno-omit-f=
rame-pointer' '-fno-optimize-sibling-calls' '-ftrivial-auto-var-init=3Dzero=
' '-fzero-init-padding-bits=3Dall' '-fno-stack-clash-protection' '-fmin-fun=
ction-alignment=3D4' '-fstrict-flex-arrays=3D3' '-fno-strict-overflow' '-fs=
tack-check=3Dno' '-fconserve-stack' '-fno-builtin-wcslen' '-Wall' '-Wextra'=
'-Wundef' '-Werror=3Dimplicit-function-declaration' '-Werror=3Dimplicit-in=
t' '-Werror=3Dreturn-type' '-Werror=3Dstrict-prototypes' '-Wno-format-secur=
ity' '-Wno-trigraphs' '-Wno-frame-address' '-Wno-address-of-packed-member' =
'-Wframe-larger-than=3D2048' '-Wno-main' '-Wno-type-limits' '-Wdangling-poi=
nter=3D0' '-Wvla-larger-than=3D1' '-Wno-pointer-sign' '-Wcast-function-type=
' '-Wno-unterminated-string-initialization' '-Warray-bounds=3D0' '-Wstringo=
p-overflow=3D0' '-Walloc-size-larger-than=3D$XXX' '-Wimplicit-fallthrough=
=3D5' '-Werror=3Ddate-time' '-Werror=3Dincompatible-pointer-types' '-Werror=
=3Ddesignated-init' '-Wenum-conversion' '-Wunused' '-Wno-unused-but-set-var=
iable' '-Wunused-const-variable=3D0' '-Wno-packed-not-aligned' '-Wformat-ov=
erflow=3D0' '-Wformat-truncation=3D0' '-Wno-stringop-truncation' '-Wno-over=
ride-init' '-Wno-missing-field-initializers' '-Wno-shift-negative-value' '-=
Wno-maybe-uninitialized' '-Wno-sign-compare' '-Wno-unused-parameter' '-g' '=
-fno-var-tracking' '-femit-struct-debug-baseonly' '-mstack-protector-guard=
=3Dsysreg' '-mstack-protector-guard-reg=3Dsp_el0' '-mstack-protector-guard-=
offset=3D1344' '-fno-common' '-fno-builtin' '-fno-stack-protector' '-ffixed=
-x18' '-D' 'DISABLE_BRANCH_PROFILING' '-D' 'BUILD_VDSO' '-O2' '-mcmodel=3Dt=
iny' '-fasynchronous-unwind-tables' '-include' '$LINUX/lib/vdso/getrandom.c=
' '-D' 'KBUILD_MODFILE=3D"arch/arm64/kernel/vdso/vgetrandom"' '-D' 'KBUILD_=
BASENAME=3D"vgetrandom"' '-D' 'KBUILD_MODNAME=3D"vgetrandom"' '-D' '__KBUIL=
D_MODNAME=3Dvgetrandom' '-c' '-o' 'arch/arm64/kernel/vdso/vgetrandom.o' '-v=
' '-dumpdir' 'arch/arm64/kernel/vdso/'
/usr/libexec/gcc-cross/aarch64-linux-gnu/15/cc1 -quiet -nostdinc -v -I ./a=
rch/arm64/include -I ./arch/arm64/include/generated -I ./include -I ./inclu=
de -I ./arch/arm64/include/uapi -I ./arch/arm64/include/generated/uapi -I .=
/include/uapi -I ./include/generated/uapi -imultiarch aarch64-linux-gnu -D =
__KERNEL__ -D KASAN_SHADOW_SCALE_SHIFT=3D -D CONFIG_CC_HAS_K_CONSTRAINT=3D1=
-D ARM64_ASM_ARCH=3D"armv8.5-a" -D KASAN_SHADOW_SCALE_SHIFT=3D -D DISABLE_=
BRANCH_PROFILING -D BUILD_VDSO -D KBUILD_MODFILE=3D"arch/arm64/kernel/vdso/=
vgetrandom" -D KBUILD_BASENAME=3D"vgetrandom" -D KBUILD_MODNAME=3D"vgetrand=
om" -D __KBUILD_MODNAME=3Dvgetrandom -include ./include/linux/compiler-vers=
ion.h -include ./include/linux/kconfig.h -include ./include/linux/compiler_=
types.h -include /usr/local/google/home/briannorris/git/linux/lib/vdso/getr=
andom.c -MMD arch/arm64/kernel/vdso/.vgetrandom.o.d arch/arm64/kernel/vdso/=
vgetrandom.c -quiet -dumpdir arch/arm64/kernel/vdso/ -dumpbase vgetrandom.c=
-dumpbase-ext .c -mlittle-endian -mgeneral-regs-only -mabi=3Dlp64 -mbranch=
-protection=3Dpac-ret -mstack-protector-guard=3Dsysreg -mstack-protector-gu=
ard-reg=3Dsp_el0 -mstack-protector-guard-offset=3D1344 -mcmodel=3Dtiny -g -=
O2 -O2 -Werror -Wno-psabi -Wall -Wextra -Wundef -Werror=3Dimplicit-function=
-declaration -Werror=3Dimplicit-int -Werror=3Dreturn-type -Werror=3Dstrict-=
prototypes -Wno-format-security -Wno-trigraphs -Wno-frame-address -Wno-addr=
ess-of-packed-member -Wframe-larger-than=3D2048 -Wno-main -Wno-type-limits =
-Wdangling-pointer=3D0 -Wvla-larger-than=3D1 -Wno-pointer-sign -Wcast-funct=
ion-type -Wno-unterminated-string-initialization -Warray-bounds=3D0 -Wstrin=
gop-overflow=3D0 -Walloc-size-larger-than=3D18446744073709551615EiB -Wimpli=
cit-fallthrough=3D5 -Werror=3Ddate-time -Werror=3Dincompatible-pointer-type=
s -Werror=3Ddesignated-init -Wenum-conversion -Wunused -Wno-unused-but-set-=
variable -Wunused-const-variable=3D0 -Wno-packed-not-aligned -Wformat-overf=
low=3D0 -Wformat-truncation=3D0 -Wno-stringop-truncation -Wno-override-init=
-Wno-missing-field-initializers -Wno-shift-negative-value -Wno-maybe-unini=
tialized -Wno-sign-compare -Wno-unused-parameter -std=3Dgnu11 -version -fsh=
ort-wchar -funsigned-char -fno-PIE -fno-strict-aliasing -fms-extensions -fn=
o-unwind-tables -fno-delete-null-pointer-checks -fno-allow-store-data-races=
-fstack-protector-strong -fno-omit-frame-pointer -fno-optimize-sibling-cal=
ls -ftrivial-auto-var-init=3Dzero -fzero-init-padding-bits=3Dall -fno-stack=
-clash-protection -fmin-function-alignment=3D4 -fstrict-flex-arrays=3D3 -fn=
o-strict-overflow -fstack-check=3Dno -fconserve-stack -fno-builtin-wcslen -=
fno-var-tracking -femit-struct-debug-baseonly -fno-common -fno-builtin -fno=
-stack-protector -ffixed-x18 -fasynchronous-unwind-tables -fasynchronous-un=
wind-tables -o /tmp/cc6nO0fY.s
GNU C11 (Debian 15.2.0-4) version 15.2.0 (aarch64-linux-gnu)
compiled by GNU C version 15.2.0, GMP version 6.3.0, MPFR version 4.2.2, M=
PC version 1.3.1, isl version isl-0.27-GMP
GGC heuristics: --param ggc-min-expand=3D100 --param ggc-min-heapsize=3D131=
072
ignoring duplicate directory "./include"
#include "..." search starts here:
#include <...> search starts here:
./arch/arm64/include
./arch/arm64/include/generated
./include
./arch/arm64/include/uapi
./arch/arm64/include/generated/uapi
./include/uapi
./include/generated/uapi
End of search list.
Compiler executable checksum: 2014541e26adcb350b182f07eff54ec5
COLLECT_GCC_OPTIONS=3D'-nostdinc' '-I' './arch/arm64/include' '-I' './arch/=
arm64/include/generated' '-I' './include' '-I' './include' '-I' './arch/arm=
64/include/uapi' '-I' './arch/arm64/include/generated/uapi' '-I' './include=
/uapi' '-I' './include/generated/uapi' '-include' './include/linux/compiler=
-version.h' '-include' './include/linux/kconfig.h' '-include' './include/li=
nux/compiler_types.h' '-D' '__KERNEL__' '-mlittle-endian' '-D' 'KASAN_SHADO=
W_SCALE_SHIFT=3D' '-Werror' '-fshort-wchar' '-funsigned-char' '-fno-PIE' '-=
fno-strict-aliasing' '-std=3Dgnu11' '-fms-extensions' '-mgeneral-regs-only'=
'-D' 'CONFIG_CC_HAS_K_CONSTRAINT=3D1' '-Wno-psabi' '-mabi=3Dlp64' '-fno-un=
wind-tables' '-mbranch-protection=3Dpac-ret' '-D' 'ARM64_ASM_ARCH=3D"armv8.=
5-a"' '-D' 'KASAN_SHADOW_SCALE_SHIFT=3D' '-fno-delete-null-pointer-checks' =
'-O2' '-fno-allow-store-data-races' '-fstack-protector-strong' '-fno-omit-f=
rame-pointer' '-fno-optimize-sibling-calls' '-ftrivial-auto-var-init=3Dzero=
' '-fzero-init-padding-bits=3Dall' '-fno-stack-clash-protection' '-fmin-fun=
ction-alignment=3D4' '-fstrict-flex-arrays=3D3' '-fno-strict-overflow' '-fs=
tack-check=3Dno' '-fconserve-stack' '-fno-builtin-wcslen' '-Wall' '-Wextra'=
'-Wundef' '-Werror=3Dimplicit-function-declaration' '-Werror=3Dimplicit-in=
t' '-Werror=3Dreturn-type' '-Werror=3Dstrict-prototypes' '-Wno-format-secur=
ity' '-Wno-trigraphs' '-Wno-frame-address' '-Wno-address-of-packed-member' =
'-Wframe-larger-than=3D2048' '-Wno-main' '-Wno-type-limits' '-Wdangling-poi=
nter=3D0' '-Wvla-larger-than=3D1' '-Wno-pointer-sign' '-Wcast-function-type=
' '-Wno-unterminated-string-initialization' '-Warray-bounds=3D0' '-Wstringo=
p-overflow=3D0' '-Walloc-size-larger-than=3D$XXX' '-Wimplicit-fallthrough=
=3D5' '-Werror=3Ddate-time' '-Werror=3Dincompatible-pointer-types' '-Werror=
=3Ddesignated-init' '-Wenum-conversion' '-Wunused' '-Wno-unused-but-set-var=
iable' '-Wunused-const-variable=3D0' '-Wno-packed-not-aligned' '-Wformat-ov=
erflow=3D0' '-Wformat-truncation=3D0' '-Wno-stringop-truncation' '-Wno-over=
ride-init' '-Wno-missing-field-initializers' '-Wno-shift-negative-value' '-=
Wno-maybe-uninitialized' '-Wno-sign-compare' '-Wno-unused-parameter' '-g' '=
-fno-var-tracking' '-femit-struct-debug-baseonly' '-mstack-protector-guard=
=3Dsysreg' '-mstack-protector-guard-reg=3Dsp_el0' '-mstack-protector-guard-=
offset=3D1344' '-fno-common' '-fno-builtin' '-fno-stack-protector' '-ffixed=
-x18' '-D' 'DISABLE_BRANCH_PROFILING' '-D' 'BUILD_VDSO' '-O2' '-mcmodel=3Dt=
iny' '-fasynchronous-unwind-tables' '-include' '/usr/local/google/home/bria=
nnorris/git/linux/lib/vdso/getrandom.c' '-D' 'KBUILD_MODFILE=3D"arch/arm64/=
kernel/vdso/vgetrandom"' '-D' 'KBUILD_BASENAME=3D"vgetrandom"' '-D' 'KBUILD=
_MODNAME=3D"vgetrandom"' '-D' '__KBUILD_MODNAME=3Dvgetrandom' '-c' '-o' 'ar=
ch/arm64/kernel/vdso/vgetrandom.o' '-v' '-dumpdir' 'arch/arm64/kernel/vdso/'
/usr/lib/gcc-cross/aarch64-linux-gnu/15/../../../../aarch64-linux-gnu/bin/=
as -v -I ./arch/arm64/include -I ./arch/arm64/include/generated -I ./includ=
e -I ./include -I ./arch/arm64/include/uapi -I ./arch/arm64/include/generat=
ed/uapi -I ./include/uapi -I ./include/generated/uapi --gsframe --gdwarf-5 =
-EL -mabi=3Dlp64 -march=3Darmv8.5-a -o arch/arm64/kernel/vdso/vgetrandom.o =
/tmp/cc6nO0fY.s
GNU assembler version 2.46.50 (aarch64-linux-gnu) using BFD version (GNU Bi=
nutils for Debian) 2.46.50.20260617
COMPILER_PATH=3D/usr/libexec/gcc-cross/aarch64-linux-gnu/15/:/usr/libexec/g=
cc-cross/aarch64-linux-gnu/15/:/usr/libexec/gcc-cross/aarch64-linux-gnu/:/u=
sr/lib/gcc-cross/aarch64-linux-gnu/15/:/usr/lib/gcc-cross/aarch64-linux-gnu=
/:/usr/lib/gcc-cross/aarch64-linux-gnu/15/../../../../aarch64-linux-gnu/bin/
LIBRARY_PATH=3D/usr/lib/gcc-cross/aarch64-linux-gnu/15/:/usr/lib/gcc-cross/=
aarch64-linux-gnu/15/../../../../aarch64-linux-gnu/lib/../lib/:/lib/aarch64=
-linux-gnu/:/lib/../lib/:/usr/lib/aarch64-linux-gnu/:/usr/lib/../lib/:/usr/=
lib/gcc-cross/aarch64-linux-gnu/15/../../../../aarch64-linux-gnu/lib/:/lib/=
:/usr/lib/
COLLECT_GCC_OPTIONS=3D'-nostdinc' '-I' './arch/arm64/include' '-I' './arch/=
arm64/include/generated' '-I' './include' '-I' './include' '-I' './arch/arm=
64/include/uapi' '-I' './arch/arm64/include/generated/uapi' '-I' './include=
/uapi' '-I' './include/generated/uapi' '-include' './include/linux/compiler=
-version.h' '-include' './include/linux/kconfig.h' '-include' './include/li=
nux/compiler_types.h' '-D' '__KERNEL__' '-mlittle-endian' '-D' 'KASAN_SHADO=
W_SCALE_SHIFT=3D' '-Werror' '-fshort-wchar' '-funsigned-char' '-fno-PIE' '-=
fno-strict-aliasing' '-std=3Dgnu11' '-fms-extensions' '-mgeneral-regs-only'=
'-D' 'CONFIG_CC_HAS_K_CONSTRAINT=3D1' '-Wno-psabi' '-mabi=3Dlp64' '-fno-un=
wind-tables' '-mbranch-protection=3Dpac-ret' '-D' 'ARM64_ASM_ARCH=3D"armv8.=
5-a"' '-D' 'KASAN_SHADOW_SCALE_SHIFT=3D' '-fno-delete-null-pointer-checks' =
'-O2' '-fno-allow-store-data-races' '-fstack-protector-strong' '-fno-omit-f=
rame-pointer' '-fno-optimize-sibling-calls' '-ftrivial-auto-var-init=3Dzero=
' '-fzero-init-padding-bits=3Dall' '-fno-stack-clash-protection' '-fmin-fun=
ction-alignment=3D4' '-fstrict-flex-arrays=3D3' '-fno-strict-overflow' '-fs=
tack-check=3Dno' '-fconserve-stack' '-fno-builtin-wcslen' '-Wall' '-Wextra'=
'-Wundef' '-Werror=3Dimplicit-function-declaration' '-Werror=3Dimplicit-in=
t' '-Werror=3Dreturn-type' '-Werror=3Dstrict-prototypes' '-Wno-format-secur=
ity' '-Wno-trigraphs' '-Wno-frame-address' '-Wno-address-of-packed-member' =
'-Wframe-larger-than=3D2048' '-Wno-main' '-Wno-type-limits' '-Wdangling-poi=
nter=3D0' '-Wvla-larger-than=3D1' '-Wno-pointer-sign' '-Wcast-function-type=
' '-Wno-unterminated-string-initialization' '-Warray-bounds=3D0' '-Wstringo=
p-overflow=3D0' '-Walloc-size-larger-than=3D$XXX' '-Wimplicit-fallthrough=
=3D5' '-Werror=3Ddate-time' '-Werror=3Dincompatible-pointer-types' '-Werror=
=3Ddesignated-init' '-Wenum-conversion' '-Wunused' '-Wno-unused-but-set-var=
iable' '-Wunused-const-variable=3D0' '-Wno-packed-not-aligned' '-Wformat-ov=
erflow=3D0' '-Wformat-truncation=3D0' '-Wno-stringop-truncation' '-Wno-over=
ride-init' '-Wno-missing-field-initializers' '-Wno-shift-negative-value' '-=
Wno-maybe-uninitialized' '-Wno-sign-compare' '-Wno-unused-parameter' '-g' '=
-fno-var-tracking' '-femit-struct-debug-baseonly' '-mstack-protector-guard=
=3Dsysreg' '-mstack-protector-guard-reg=3Dsp_el0' '-mstack-protector-guard-=
offset=3D1344' '-fno-common' '-fno-builtin' '-fno-stack-protector' '-ffixed=
-x18' '-D' 'DISABLE_BRANCH_PROFILING' '-D' 'BUILD_VDSO' '-O2' '-mcmodel=3Dt=
iny' '-fasynchronous-unwind-tables' '-include' '/usr/local/google/home/bria=
nnorris/git/linux/lib/vdso/getrandom.c' '-D' 'KBUILD_MODFILE=3D"arch/arm64/=
kernel/vdso/vgetrandom"' '-D' 'KBUILD_BASENAME=3D"vgetrandom"' '-D' 'KBUILD=
_MODNAME=3D"vgetrandom"' '-D' '__KBUILD_MODNAME=3Dvgetrandom' '-c' '-o' 'ar=
ch/arm64/kernel/vdso/vgetrandom.o' '-v' '-dumpdir' 'arch/arm64/kernel/vdso/=
vgetrandom.'
> Does the intermediate source or assembler source have any
> ".cfi_section .sframe" statement?
>=20
> $ make arch/arm64/kernel/vdso/vgetrandom.i
This fails to build with WERROR, because it seems to require the linker
step that fails, so I have to disable WERROR. Afterward:
$ grep -i sframe arch/arm64/kernel/vdso/vgetrandom.i
// (empty)
> $ make arch/arm64/kernel/vdso/vgetrandom.s
This fails to build.
$ make CROSS_COMPILE=3D'ccache aarch64-linux-gnu-' ARCH=3Darm64 -j80 arch/a=
rm64/kernel/vdso/vgetrandom.s
CC arch/arm64/kernel/vdso/vgetrandom.s
arch/arm64/kernel/vdso/vgetrandom.c:5:8: error: =E2=80=98__cvdso_getrandom=
=E2=80=99 undeclared here (not in a function)
5 | typeof(__cvdso_getrandom) __kernel_getrandom;
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/vdso/vgetrandom.c:7:1: error: unknown type name =E2=80=98=
ssize_t=E2=80=99
7 | ssize_t __kernel_getrandom(void *buffer, size_t len, unsigned int f=
lags, void *opaque_state, size_t opaque_len)
| ^~~~~~~
arch/arm64/kernel/vdso/vgetrandom.c:7:42: error: unknown type name =E2=80=
=98size_t=E2=80=99
7 | ssize_t __kernel_getrandom(void *buffer, size_t len, unsigned int f=
lags, void *opaque_state, size_t opaque_len)
| ^~~~~~
arch/arm64/kernel/vdso/vgetrandom.c:4:1: note: =E2=80=98size_t=E2=80=99 is =
defined in header =E2=80=98<stddef.h>=E2=80=99; this is probably fixable by=
adding =E2=80=98#include <stddef.h>=E2=80=99
3 | #include <uapi/asm-generic/errno.h>
+++ |+#include <stddef.h>
4 |
arch/arm64/kernel/vdso/vgetrandom.c:7:94: error: unknown type name =E2=80=
=98size_t=E2=80=99
7 | ssize_t __kernel_getrandom(void *buffer, size_t len, unsigned int f=
lags, void *opaque_state, size_t opaque_len)
| =
^~~~~~
arch/arm64/kernel/vdso/vgetrandom.c:7:94: note: =E2=80=98size_t=E2=80=99 is=
defined in header =E2=80=98<stddef.h>=E2=80=99; this is probably fixable b=
y adding =E2=80=98#include <stddef.h>=E2=80=99
make[4]: *** [scripts/Makefile.build:184: arch/arm64/kernel/vdso/vgetrandom=
=2Es] Error 1
make[3]: *** [scripts/Makefile.build:549: arch/arm64/kernel] Error 2
make[2]: *** [scripts/Makefile.build:549: arch/arm64] Error 2
> Can you please verify that your arch/arm64/kernel/vdso/vgetrandom.o
> actually contains an .sframe section:
>=20
> $ readelf -WS arch/arm64/kernel/vdso/vgetrandom.o
$ readelf -WS arch/arm64/kernel/vdso/vgetrandom.o | grep -i sframe
[22] .sframe GNU_SFRAME 0000000000000000 002438 000083 00 =
A 0 0 8
[23] .rela.sframe RELA 0000000000000000 003988 000018 18 =
I 24 22 8
Brian