Re: [syzbot] [batman?] WARNING in batadv_iv_ogm_process_per_outif

[syzbot <syzbot+a079f084653164a652d1@syzkaller.appspotmail.com>]

Hello,

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

SYZFAIL: failed to recv rpc

SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
execution of simple program fails: NOTFAIL: arptable checkpoint: getsockopt(ARPT_SO_GET_ENTRIES) failed. table=filter (errno 22: Invalid argument).


Warning: Permanently added '10.128.1.177' (ED25519) to the list of known hosts.
2026/09/15 10:36:35 parsed 1 programs
2026/09/15 10:36:35 serving rpc on tcp://36671
[   97.008320][ T5631] cgroup: Unknown subsys name 'net'
[   97.146437][ T5631] cgroup: Unknown subsys name 'cpuset'
[   97.150104][ T5631] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   97.577622][   T10] cfg80211: failed to load regulatory.db
[   98.952704][ T5631] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[  102.463188][ T5645] soft_limit_in_bytes is deprecated and will be removed. Writing any value to this file has no effect. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
[  102.468100][ T5645] ebtables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[  102.468498][ T5645] arp_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[  102.468788][ T5645] ip_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[  102.469155][ T5645] ip6_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[  104.670974][ T5680] bridge0: port 1(bridge_slave_0) entered blocking state
[  104.671498][ T5680] bridge0: port 1(bridge_slave_0) entered disabled state
[  104.671624][ T5680] bridge_slave_0: entered allmulticast mode
[  104.676501][ T5680] bridge_slave_0: entered promiscuous mode
[  104.701324][ T5680] bridge0: port 2(bridge_slave_1) entered blocking state
[  104.701462][ T5680] bridge0: port 2(bridge_slave_1) entered disabled state
[  104.701645][ T5680] bridge_slave_1: entered allmulticast mode
[  104.707565][ T5680] bridge_slave_1: entered promiscuous mode
[  104.755188][ T5680] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[  104.758093][ T5680] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[  104.801186][ T5680] team0: Port device team_slave_0 added
[  104.808350][ T5680] team0: Port device team_slave_1 added
[  104.836597][ T5680] batman_adv: batadv0: Adding interface: batadv_slave_0
[  104.836612][ T5680] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[  104.836639][ T5680] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[  104.838815][ T5680] batman_adv: batadv0: Adding interface: batadv_slave_1
[  104.838832][ T5680] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[  104.838864][ T5680] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[  104.961449][ T5680] hsr_slave_0: entered promiscuous mode
[  104.963188][ T5680] hsr_slave_1: entered promiscuous mode
[  105.141888][ T5680] netdevsim netdevsim1 netdevsim0: renamed from eth0
[  105.155219][ T5680] 8021q: adding VLAN 0 to HW filter on device netdevsim0
[  105.156750][ T5680] netdevsim netdevsim1 netdevsim1: renamed from eth1
[  105.161486][ T5680] 8021q: adding VLAN 0 to HW filter on device netdevsim1
[  105.163701][ T5680] netdevsim netdevsim1 netdevsim2: renamed from eth2
[  105.195893][ T5680] 8021q: adding VLAN 0 to HW filter on device netdevsim2
[  105.197198][ T5680] netdevsim netdevsim1 netdevsim3: renamed from eth3
[  105.209126][ T5680] 8021q: adding VLAN 0 to HW filter on device netdevsim3
[  105.255166][ T5680] bridge0: port 2(bridge_slave_1) entered blocking state
[  105.255262][ T5680] bridge0: port 2(bridge_slave_1) entered forwarding state
[  105.255686][ T5680] bridge0: port 1(bridge_slave_0) entered blocking state
[  105.255772][ T5680] bridge0: port 1(bridge_slave_0) entered forwarding state
[  105.350068][ T5680] 8021q: adding VLAN 0 to HW filter on device bond0
[  105.378361][   T12] bridge0: port 1(bridge_slave_0) entered disabled state
[  105.379845][   T12] bridge0: port 2(bridge_slave_1) entered disabled state
[  105.415939][ T5680] 8021q: adding VLAN 0 to HW filter on device team0
[  105.433157][   T80] bridge0: port 1(bridge_slave_0) entered blocking state
[  105.433259][   T80] bridge0: port 1(bridge_slave_0) entered forwarding state
[  105.441920][   T12] bridge0: port 2(bridge_slave_1) entered blocking state
[  105.442026][   T12] bridge0: port 2(bridge_slave_1) entered forwarding state
[  105.562918][ T5680] 8021q: adding VLAN 0 to HW filter on device batadv0
[  105.619871][ T5680] veth0_vlan: entered promiscuous mode
[  105.636147][ T5680] veth1_vlan: entered promiscuous mode
[  105.676296][ T5680] veth0_macvtap: entered promiscuous mode
[  105.681087][ T5680] veth1_macvtap: entered promiscuous mode
[  105.711601][ T5680] batman_adv: batadv0: Interface activated: batadv_slave_0
[  105.729189][ T5680] batman_adv: batadv0: Interface activated: batadv_slave_1
[  105.765089][   T42] netdevsim netdevsim1 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[  105.770453][   T42] netdevsim netdevsim1 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[  105.770501][   T42] netdevsim netdevsim1 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[  105.832641][   T80] netdevsim netdevsim1 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[  105.974888][   T80] netdevsim netdevsim1 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  106.097260][   T80] netdevsim netdevsim1 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  106.189599][   T80] netdevsim netdevsim1 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  106.656817][   T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[  106.657692][   T52] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[  106.658215][   T52] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[  106.659613][   T52] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[  106.660392][   T52] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[  107.325697][   T80] netdevsim netdevsim1 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  107.446452][   T50] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  107.446481][   T50] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  107.505920][   T50] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  107.505944][   T50] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
execution of simple program fails: NOTFAIL: arptable checkpoint: getsockopt(ARPT_SO_GET_ENTRIES) failed. table=filter (errno 22: Invalid argument).
[  108.836631][   T80] bridge_slave_1: left allmulticast mode
[  108.836678][   T80] bridge_slave_1: left promiscuous mode
[  108.838492][   T80] bridge0: port 2(bridge_slave_1) entered disabled state
[  108.845622][   T80] bridge_slave_0: left allmulticast mode
[  108.845707][   T80] bridge_slave_0: left promiscuous mode
[  108.846394][   T80] bridge0: port 1(bridge_slave_0) entered disabled state
[  109.026958][   T80] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[  109.029905][   T80] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[  109.031739][   T80] bond0 (unregistering): Released all slaves
[  109.123743][   T80] hsr_slave_0: left promiscuous mode
[  109.124600][   T80] hsr_slave_1: left promiscuous mode
[  109.125726][   T80] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[  109.125760][   T80] batman_adv: batadv0: Removing interface: batadv_slave_0
[  109.126927][   T80] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[  109.126946][   T80] batman_adv: batadv0: Removing interface: batadv_slave_1
[  109.181999][   T80] veth1_macvtap: left promiscuous mode
[  109.188497][   T80] veth0_macvtap: left promiscuous mode
[  109.188647][   T80] veth1_vlan: left promiscuous mode
[  109.189658][   T80] veth0_vlan: left promiscuous mode
[  109.566173][   T80] team0 (unregistering): Port device team_slave_1 removed
[  109.599106][   T80] team0 (unregistering): Port device team_slave_0 removed
[  109.788679][ T5279] 8021q: adding VLAN 0 to HW filter on device eth1
[  110.520208][ T5279] 8021q: adding VLAN 0 to HW filter on device eth2
[  111.351931][ T5279] 8021q: adding VLAN 0 to HW filter on device eth3
[  111.769916][ T5279] 8021q: adding VLAN 0 to HW filter on device eth4


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1226858570=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at b6a5eeb7114
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}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=b6a5eeb7114b1887514b0d74ca39167dfbfa4603 -X github.com/google/syzkaller/prog.gitRevisionDate=20260911-102446"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=b6a5eeb7114b1887514b0d74ca39167dfbfa4603 -X github.com/google/syzkaller/prog.gitRevisionDate=20260911-102446"  ./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
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=b6a5eeb7114b1887514b0d74ca39167dfbfa4603 -X github.com/google/syzkaller/prog.gitRevisionDate=20260911-102446"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_386
x86_64-linux-gnu-g++ -o ./bin/linux_386/syz-executor executor/executor.cc \
	-m32 -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   -DGOOS_linux=1 -DGOARCH_386=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"b6a5eeb7114b1887514b0d74ca39167dfbfa4603\"
/usr/bin/ld: /tmp/ccItziqN.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x145): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null
[INFO] Unsupported architecture '386', skipping check.



Tested on:

commit:         58785836 Merge tag 'nfsd-7.3-1' of git://git.kernel.or..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=5e4e3a0e188a497e
dashboard link: https://syzkaller.appspot.com/bug?extid=a079f084653164a652d1
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: i386
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13707df9580000