On 10/10/2021 1:01 AM, Yafang Shao wrote:
On Sat, Oct 9, 2021 at 8:05 PM kernel test robot <lkp@xxxxxxxxx> wrote:
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
head: b2d5b9cec60fecc72a13191c2c6c05acf60975a5
commit: 60f2415e19d3948641149ac6aca137a7be1d1952 [14/47] sched: Make schedstats helpers independent of fair sched class
config: nds32-randconfig-s031-20211009 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 11.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4
# https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=60f2415e19d3948641149ac6aca137a7be1d1952
git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
git fetch --no-tags tip sched/core
git checkout 60f2415e19d3948641149ac6aca137a7be1d1952
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=nds32
Hi kernel test robot,
When I'm trying to reproduce it, I find there're lots of "Segmentation
fault sparse" errors even without my commit,
Hi Yafang,
Thanks for reporting this issue.
We got the same "sparse segfault" errors when reproducing locally.
We also tried to use gdb to locate the segfault position, and got below output:
Program received signal SIGSEGV, Segmentation fault.
0x000055555556945c in copy_expression (expr=0x7ffff3df7710) at inline.c:158
158 if (expr->cast_expression->type == EXPR_INITIALIZER) {
We did some simple investigation and found that it is caused by a null pointer:
...
expr: 0x7ffff3eb20d0 expr->cast_expression: 0x7ffff3eb2110
expr: 0x7ffff3eb28d0 expr->cast_expression: 0x7ffff3eb2910
expr: 0x7ffff3f58050 expr->cast_expression: 0x7ffff3f58090
expr: 0x7ffff3f58850 expr->cast_expression: 0x7ffff3f58890
expr: 0x7ffff3df7710 expr->cast_expression: (nil)
Hi Luc and linux-sparse folks,
We got above "sparse segfault" errors when running "make C=1 ARCH=nds32" on this kernel commit.
We are using sparse v0.6.4.
Could you please help to give some advice about this issue? Thanks.
Regards,
Yujie
for example,
/bin/sh: line 1: 85051 Segmentation fault (core dumped) sparse
-D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise
-Wno-return-void -Wno-unknown-attribute -fdiagnostic-prefix
-D__CHECK_ENDIAN__ -D__NDS32_EB__ --arch=nds32 -mbig-endian -m32
-Wp,-MMD,init/.main.o.d -nostdinc -isystem
/root/0day/gcc-11.2.0-nolibc/nds32le-linux/bin/../lib/gcc/nds32le-linux/11.2.0/include
-I./arch/nds32/include -I./arch/nds32/include/generated -I./include
-I./arch/nds32/include/uapi -I./arch/nds32/include/generated/uapi
-I./include/uapi -I./include/generated/uapi -include
./include/linux/compiler-version.h -include ./include/linux/kconfig.h
-include ./include/linux/compiler_types.h -D__KERNEL__
-fmacro-prefix-map=./= -Wall -Wundef -Werror=strict-prototypes
-Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE
-Werror=implicit-function-declaration -Werror=implicit-int
-Werror=return-type -Wno-format-security -std=gnu89
-mno-sched-prolog-epilog -mcmodel=large -mno-ext-fpu-sp
-mno-ext-fpu-dp -mfloat-abi=soft -EB -fno-delete-null-pointer-checks
-Wno-frame-address -Wno-format-truncation -Wno-format-overflow
-Wno-address-of-packed-member -O2 -fno-allow-store-data-races
-fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
-Wframe-larger-than=1024 -fno-stack-protector -Wimplicit-fallthrough=5
-Wno-main -Wno-unused-but-set-variable -Wno-unused-const-variable
-fomit-frame-pointer -fno-stack-clash-protection
-fzero-call-used-regs=used-gpr -fno-inline-functions-called-once
-falign-functions=64 -Wdeclaration-after-statement -Wvla
-Wno-pointer-sign -Wno-stringop-truncation -Wno-zero-length-bounds
-Wno-array-bounds -Wno-stringop-overflow -Wno-restrict
-Wno-maybe-uninitialized -fno-strict-overflow -fno-stack-check
-fconserve-stack -Werror=date-time -Werror=incompatible-pointer-types
-Werror=designated-init -Wno-packed-not-aligned -fno-function-sections
-fno-data-sections -DKBUILD_MODFILE='"init/main"'
-DKBUILD_BASENAME='"main"' -DKBUILD_MODNAME='"main"'
-D__KBUILD_MODNAME=kmod_main init/main.c
/bin/sh: line 1: 88064 Segmentation fault (core dumped) sparse
-D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise
-Wno-return-void -Wno-unknown-attribute -fdiagnostic-prefix
-D__CHECK_ENDIAN__ -D__NDS32_EB__ --arch=nds32 -mbig-endian -m32
-Wp,-MMD,kernel/events/.core.o.d -nostdinc -isystem
/root/0day/gcc-11.2.0-nolibc/nds32le-linux/bin/../lib/gcc/nds32le-linux/11.2.0/include
-I./arch/nds32/include -I./arch/nds32/include/generated -I./include
-I./arch/nds32/include/uapi -I./arch/nds32/include/generated/uapi
-I./include/uapi -I./include/generated/uapi -include
./include/linux/compiler-version.h -include ./include/linux/kconfig.h
-include ./include/linux/compiler_types.h -D__KERNEL__
-fmacro-prefix-map=./= -Wall -Wundef -Werror=strict-prototypes
-Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE
-Werror=implicit-function-declaration -Werror=implicit-int
-Werror=return-type -Wno-format-security -std=gnu89
-mno-sched-prolog-epilog -mcmodel=large -mno-ext-fpu-sp
-mno-ext-fpu-dp -mfloat-abi=soft -EB -fno-delete-null-pointer-checks
-Wno-frame-address -Wno-format-truncation -Wno-format-overflow
-Wno-address-of-packed-member -O2 -fno-allow-store-data-races
-fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
-Wframe-larger-than=1024 -fno-stack-protector -Wimplicit-fallthrough=5
-Wno-main -Wno-unused-but-set-variable -Wno-unused-const-variable
-fomit-frame-pointer -fno-stack-clash-protection
-fzero-call-used-regs=used-gpr -fno-inline-functions-called-once
-falign-functions=64 -Wdeclaration-after-statement -Wvla
-Wno-pointer-sign -Wno-stringop-truncation -Wno-zero-length-bounds
-Wno-array-bounds -Wno-stringop-overflow -Wno-restrict
-Wno-maybe-uninitialized -fno-strict-overflow -fno-stack-check
-fconserve-stack -Werror=date-time -Werror=incompatible-pointer-types
-Werror=designated-init -Wno-packed-not-aligned
-DKBUILD_MODFILE='"kernel/events/core"' -DKBUILD_BASENAME='"core"'
-DKBUILD_MODNAME='"core"' -D__KBUILD_MODNAME=kmod_core
kernel/events/core.c
/bin/sh: line 1: 88141 Segmentation fault (core dumped) sparse
-D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise
-Wno-return-void -Wno-unknown-attribute -fdiagnostic-prefix
-D__CHECK_ENDIAN__ -D__NDS32_EB__ --arch=nds32 -mbig-endian -m32
-Wp,-MMD,mm/.balloon_compaction.o.d -nostdinc -isystem
/root/0day/gcc-11.2.0-nolibc/nds32le-linux/bin/../lib/gcc/nds32le-linux/11.2.0/include
-I./arch/nds32/include -I./arch/nds32/include/generated -I./include
-I./arch/nds32/include/uapi -I./arch/nds32/include/generated/uapi
-I./include/uapi -I./include/generated/uapi -include
./include/linux/compiler-version.h -include ./include/linux/kconfig.h
-include ./include/linux/compiler_types.h -D__KERNEL__
-fmacro-prefix-map=./= -Wall -Wundef -Werror=strict-prototypes
-Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE
-Werror=implicit-function-declaration -Werror=implicit-int
-Werror=return-type -Wno-format-security -std=gnu89
-mno-sched-prolog-epilog -mcmodel=large -mno-ext-fpu-sp
-mno-ext-fpu-dp -mfloat-abi=soft -EB -fno-delete-null-pointer-checks
-Wno-frame-address -Wno-format-truncation -Wno-format-overflow
-Wno-address-of-packed-member -O2 -fno-allow-store-data-races
-fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
-Wframe-larger-than=1024 -fno-stack-protector -Wimplicit-fallthrough=5
-Wno-main -Wno-unused-but-set-variable -Wno-unused-const-variable
-fomit-frame-pointer -fno-stack-clash-protection
-fzero-call-used-regs=used-gpr -fno-inline-functions-called-once
-falign-functions=64 -Wdeclaration-after-statement -Wvla
-Wno-pointer-sign -Wno-stringop-truncation -Wno-zero-length-bounds
-Wno-array-bounds -Wno-stringop-overflow -Wno-restrict
-Wno-maybe-uninitialized -fno-strict-overflow -fno-stack-check
-fconserve-stack -Werror=date-time -Werror=incompatible-pointer-types
-Werror=designated-init -Wno-packed-not-aligned
-DKBUILD_MODFILE='"mm/balloon_compaction"'
-DKBUILD_BASENAME='"balloon_compaction"'
-DKBUILD_MODNAME='"balloon_compaction"'
-D__KBUILD_MODNAME=kmod_balloon_compaction mm/balloon_compaction.c
....
And those Segmentation fault of sparse can also be found in dmesg,
[ 5540.785485] sparse[91520]: segfault at 0 ip 0000000000417bff sp
00007ffe318f1e80 error 4 in sparse[400000+53000]
[ 5540.785489] Code: ff ff ff e9 dc fd ff ff 0f 1f 00 48 8b 7f 20 e8
97 fc ff ff 48 3b 43 20 48 89 c5 0f 85 3f fd ff ff e9 be fd ff ff 48
8b 6f 28 <80> 7d 00 18 0f 85 9b fd ff ff 4c 8b 77 08 4c 8b 6f 20 31 ff
e8 38
[ 5541.924384] sparse[91643]: segfault at 0 ip 0000000000417bff sp
00007ffc4f408a30 error 4 in sparse[400000+53000]
[ 5541.924389] Code: ff ff ff e9 dc fd ff ff 0f 1f 00 48 8b 7f 20 e8
97 fc ff ff 48 3b 43 20 48 89 c5 0f 85 3f fd ff ff e9 be fd ff ff 48
8b 6f 28 <80> 7d 00 18 0f 85 9b fd ff ff 4c 8b 77 08 4c 8b 6f 20 31 ff
e8 38
[ 5542.836875] sparse[91748]: segfault at 0 ip 0000000000417bff sp
00007ffdebd5d880 error 4 in sparse[400000+53000]
[ 5542.836881] Code: ff ff ff e9 dc fd ff ff 0f 1f 00 48 8b 7f 20 e8
97 fc ff ff 48 3b 43 20 48 89 c5 0f 85 3f fd ff ff e9 be fd ff ff 48
8b 6f 28 <80> 7d 00 18 0f 85 9b fd ff ff 4c 8b 77 08 4c 8b 6f 20 31 ff
e8 38
[ 5543.763152] sparse[91855]: segfault at 0 ip 0000000000417bff sp
00007ffd4b9789c0 error 4 in sparse[400000+53000]
[ 5543.763158] Code: ff ff ff e9 dc fd ff ff 0f 1f 00 48 8b 7f 20 e8
97 fc ff ff 48 3b 43 20 48 89 c5 0f 85 3f fd ff ff e9 be fd ff ff 48
8b 6f 28 <80> 7d 00 18 0f 85 9b fd ff ff 4c 8b 77 08 4c 8b 6f 20 31 ff
e8 38
[ 5545.193189] sparse[91999]: segfault at 0 ip 0000000000417bff sp
00007ffcfa153710 error 4 in sparse[400000+53000]
[ 5545.193216] Code: ff ff ff e9 dc fd ff ff 0f 1f 00 48 8b 7f 20 e8
97 fc ff ff 48 3b 43 20 48 89 c5 0f 85 3f fd ff ff e9 be fd ff ff 48
8b 6f 28 <80> 7d 00 18 0f 85 9b fd ff ff 4c 8b 77 08 4c 8b 6f 20 31 ff
e8 38
....
Doesn't that mean there is a bug in the sparse ?
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All errors (new ones prefixed by >>):
kernel/sched/fair.c: note: in included file (through include/linux/ww_mutex.h, include/linux/seqlock.h, include/linux/hrtimer.h, ...):
include/linux/rtmutex.h:70:65: sparse: sparse: Expected ) in function declarator
include/linux/rtmutex.h:70:65: sparse: sparse: got $
kernel/sched/fair.c: note: in included file (through include/linux/sched.h, kernel/sched/sched.h):
include/linux/seccomp.h:96:63: sparse: sparse: Expected ) in function declarator
include/linux/seccomp.h:96:63: sparse: sparse: got $
include/linux/seccomp.h:99:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/seccomp.h:99:1: sparse: sparse: got }
include/linux/seccomp.h:103:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/seccomp.h:103:1: sparse: sparse: got }
include/linux/seccomp.h:116:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/seccomp.h:116:1: sparse: sparse: got }
include/linux/seccomp.h:122:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/seccomp.h:122:1: sparse: sparse: got }
kernel/sched/fair.c: note: in included file (through include/linux/nodemask.h, include/linux/sched.h, kernel/sched/sched.h):
include/linux/numa.h:50:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/numa.h:50:1: sparse: sparse: got }
include/linux/numa.h:54:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/numa.h:54:1: sparse: sparse: got }
include/linux/numa.h:58:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/numa.h:58:1: sparse: sparse: got }
kernel/sched/fair.c: note: in included file (through include/linux/sched.h, kernel/sched/sched.h):
include/linux/nodemask.h:98:54: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:98:54: sparse: sparse: got }
include/linux/nodemask.h:99:19: sparse: sparse: Expected ; at end of declaration
include/linux/nodemask.h:99:19: sparse: sparse: got _unused_nodemask_arg_
include/linux/nodemask.h:109:68: sparse: sparse: Expected ) in function declarator
include/linux/nodemask.h:109:68: sparse: sparse: got *
include/linux/nodemask.h:112:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:112:1: sparse: sparse: got }
include/linux/nodemask.h:116:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:116:1: sparse: sparse: got }
include/linux/nodemask.h:131:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:131:1: sparse: sparse: got }
include/linux/nodemask.h:137:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:137:1: sparse: sparse: got }
include/linux/nodemask.h:143:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:143:1: sparse: sparse: got }
include/linux/nodemask.h:149:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:149:1: sparse: sparse: got }
include/linux/nodemask.h:159:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:159:1: sparse: sparse: got }
include/linux/nodemask.h:167:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:167:1: sparse: sparse: got }
include/linux/nodemask.h:175:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:175:1: sparse: sparse: got }
include/linux/nodemask.h:183:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:183:1: sparse: sparse: got }
include/linux/nodemask.h:191:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:191:1: sparse: sparse: got }
include/linux/nodemask.h:199:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:199:1: sparse: sparse: got }
include/linux/nodemask.h:207:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:207:1: sparse: sparse: got }
include/linux/nodemask.h:215:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:215:1: sparse: sparse: got }
include/linux/nodemask.h:223:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:223:1: sparse: sparse: got }
include/linux/nodemask.h:229:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:229:1: sparse: sparse: got }
include/linux/nodemask.h:235:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:235:1: sparse: sparse: got }
include/linux/nodemask.h:241:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:241:1: sparse: sparse: got }
include/linux/nodemask.h:249:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:249:1: sparse: sparse: got }
include/linux/nodemask.h:257:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:257:1: sparse: sparse: got }
include/linux/nodemask.h:265:16: sparse: sparse: Expected ) in nested declarator
include/linux/nodemask.h:265:16: sparse: sparse: got <
include/linux/nodemask.h:265:16: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:265:16: sparse: sparse: got }
include/linux/nodemask.h:266:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:266:1: sparse: sparse: got }
include/linux/nodemask.h:271:16: sparse: sparse: Expected ) in nested declarator
include/linux/nodemask.h:271:16: sparse: sparse: got <
include/linux/nodemask.h:271:16: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:271:16: sparse: sparse: got }
include/linux/nodemask.h:272:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:272:1: sparse: sparse: got }
include/linux/nodemask.h:281:53: sparse: sparse: Expected ) in function declarator
include/linux/nodemask.h:281:53: sparse: sparse: got *
include/linux/nodemask.h:284:9: sparse: sparse: Expected ) in function declarator
include/linux/nodemask.h:284:9: sparse: sparse: got (
include/linux/nodemask.h:285:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:285:1: sparse: sparse: got }
include/linux/nodemask.h:301:16: sparse: sparse: Expected ) in nested declarator
include/linux/nodemask.h:301:16: sparse: sparse: got <
include/linux/nodemask.h:301:16: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:301:16: sparse: sparse: got }
include/linux/nodemask.h:303:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:303:1: sparse: sparse: got }
include/linux/nodemask.h:337:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:337:1: sparse: sparse: got }
include/linux/nodemask.h:343:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:343:1: sparse: sparse: got }
include/linux/nodemask.h:351:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:351:1: sparse: sparse: got }
include/linux/nodemask.h:359:1: sparse: sparse: Expected ; at the end of type declaration
include/linux/nodemask.h:359:1: sparse: sparse: too many errors
/bin/bash: line 1: 21320 Segmentation fault sparse -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise -Wno-return-void -Wno-unknown-attribute -fdiagnostic-prefix -D__CHECK_ENDIAN__ -D__NDS32_EB__ --arch=nds32 -mbig-endian -m32 -Wp,-MMD,kernel/sched/.fair.o.d -nostdinc -isystem /opt/cross/gcc-11.2.0-nolibc/nds32le-linux/bin/../lib/gcc/nds32le-linux/11.2.0/include -Iarch/nds32/include -I./arch/nds32/include/generated -Iinclude -I./include -Iarch/nds32/include/uapi -I./arch/nds32/include/generated/uapi -Iinclude/uapi -I./include/generated/uapi -include include/linux/compiler-version.h -include include/linux/kconfig.h -include include/linux/compiler_types.h -D__KERNEL__ -fmacro-prefix-map== -DKBUILD_EXTRA_WARN1 -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Wno-format-security -std=gnu89 -mno-sched-prolog-epilog -mcmodel=large -
mno-ext-fpu-sp -mno-ext-fpu-dp -mfloat-abi=soft -EB -fno-delete-null-pointer-checks -Wno-frame-address -Wno-format-truncation -Wno-format-overflow -Wno-address-of-packed-member -O2 -fno-allow-store-data-races -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining -Wframe-larger-than=1024 -fno-stack-protector -Wimplicit-fallthrough=5 -Wno-main -Wno-unused-but-set-variable -Wno-unused-const-variable -fomit-frame-pointer -fno-stack-clash-protection -fzero-call-used-regs=used-gpr -fno-inline-functions-called-once -falign-functions=64 -Wdeclaration-after-statement -Wvla -Wno-pointer-sign -Wno-stringop-truncation -Wno-zero-length-bounds -Wno-array-bounds -Wno-stringop-overflow -Wno-restrict -Wno-maybe-uninitialized -fno-strict-overflow -fno-stack-check -fconserve-stack -Werror=date-time -Werror=incompatible-pointer-types -Werror=designated-init -Wno-packed-not-aligned -Wextra -Wunused -Wno-unused-parameter -Wmissing-declarations -Wmissing-format-attribute -Wmissing-prototypes -Wold-s
tyle-definition -Wmissing-include-dirs -Wunused-but-set-variable -Wunused-const-variable -Wpacked-not-aligned -Wstringop-truncation -Wno-missing-field-initializers -Wno-sign-compare -Wno-type-limits -I kernel/sched -I ./kernel/sched -DKBUILD_MODFILE='"kernel/sched/fair"' -DKBUILD_BASENAME='"fair"' -DKBUILD_MODNAME='"fair"' -D__KBUILD_MODNAME=kmod_fair kernel/sched/fair.c
---
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