Re: [syzbot] [ntfs3?] KMSAN: uninit-value in longest_match_std (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

no output from test machine



Warning: Permanently added '10.128.0.13' (ED25519) to the list of known hosts.
2025/02/03 08:08:22 ignoring optional flag "sandboxArg"="0"
2025/02/03 08:08:24 parsed 1 programs
[  208.007169][ T5774] cgroup: Unknown subsys name 'net'
[  208.124779][ T5774] cgroup: Unknown subsys name 'cpuset'
[  208.138415][ T5774] cgroup: Unknown subsys name 'rlimit'
[  224.374733][ T1279] ieee802154 phy0 wpan0: encryption failed: -22
[  224.381757][ T1279] ieee802154 phy1 wpan1: encryption failed: -22
[  252.636791][ T5774] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[  256.615109][ T5788] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@xxxxxxxxx if you depend on this functionality.
[  259.280546][   T34] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  259.289550][   T34] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  259.306947][   T80] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  259.314983][   T80] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  285.809674][ T1279] ieee802154 phy0 wpan0: encryption failed: -22
[  285.816368][ T1279] ieee802154 phy1 wpan1: encryption failed: -22
[  347.249425][ T1279] ieee802154 phy0 wpan0: encryption failed: -22
[  347.256185][ T1279] ieee802154 phy1 wpan1: encryption failed: -22
[  408.689264][ T1279] ieee802154 phy0 wpan0: encryption failed: -22
[  408.696057][ T1279] ieee802154 phy1 wpan1: encryption failed: -22


syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.22.7'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build569088624=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at f3558dbf03
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
go fmt ./sys/... >/dev/null
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=f3558dbf032eab2b77c1cb11b9ce2baffe7838d3 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20250103-110009'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"f3558dbf032eab2b77c1cb11b9ce2baffe7838d3\"
/usr/bin/ld: /tmp/ccVC8SPt.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking



Tested on:

commit:         2014c95a Linux 6.14-rc1
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=facc04d1f62a4ae1
dashboard link: https://syzkaller.appspot.com/bug?extid=08d8956768c96a2c52cf
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15911764580000