linux-kernel - Re: [syzbot] [net?] INFO: rcu detected stall in packet

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Message-ID: <000000000000cfa04f0619ab0668@google.com>
Date: Thu, 30 May 2024 05:30:04 -0700
From: syzbot <syzbot+a7d2b1d5d1af83035567@...kaller.appspotmail.com>
To: edumazet@...gle.com, hdanton@...a.com, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, radoslaw.zielonek@...il.com, 
	syzkaller-bugs@...glegroups.com, vinicius.gomes@...el.com, 
	vladimir.oltean@....com
Subject: Re: [syzbot] [net?] INFO: rcu detected stall in packet_release

Hello,

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

lost connection to test machine





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='go1.21.4'
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-build2710826618=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at 4f9530a3b
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:32: run command via tools/syz-env for best compatibility, see:
Makefile:33: 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
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=4f9530a3b62297342999c9097c77dde726522618 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231220-163507'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=4f9530a3b62297342999c9097c77dde726522618 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231220-163507'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=4f9530a3b62297342999c9097c77dde726522618 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231220-163507'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -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 -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"4f9530a3b62297342999c9097c77dde726522618\"



Tested on:

commit:         c53a46b1 net: smc91x: Remove commented out code
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main
kernel config:  https://syzkaller.appspot.com/x/.config?x=98a238b2569af6d
dashboard link: https://syzkaller.appspot.com/bug?extid=a7d2b1d5d1af83035567
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=169aadec980000