Message-ID: <6969aa2b.050a0220.58bed.0038.GAE@google.com>
Date: Thu, 15 Jan 2026 19:02:03 -0800
From: syzbot <syzbot+3f2d46b6e62b8dd546d3@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hams?] memory leak in nr_add_node

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)


Warning: Permanently added '10.128.0.92' (ED25519) to the list of known hosts.
2026/01/16 03:01:03 parsed 1 programs
[   43.274917][ T5817] cgroup: Unknown subsys name 'net'
[   43.453971][ T5817] cgroup: Unknown subsys name 'cpuset'
[   43.460625][ T5817] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   51.660653][ T5817] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   52.936056][ T5823] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@...ck.org if you depend on this functionality.
[   53.185904][   T50] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   53.193118][   T50] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   53.200458][   T50] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   53.208221][   T50] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   53.215870][   T50] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   53.301342][ T5855] chnl_net:caif_netlink_parms(): no params data found
[   53.323226][ T5855] bridge0: port 1(bridge_slave_0) entered blocking state
[   53.332459][ T5855] bridge0: port 1(bridge_slave_0) entered disabled state
[   53.340240][ T5855] bridge_slave_0: entered allmulticast mode
[   53.347229][ T5855] bridge_slave_0: entered promiscuous mode
[   53.354632][ T5855] bridge0: port 2(bridge_slave_1) entered blocking state
[   53.362940][ T5855] bridge0: port 2(bridge_slave_1) entered disabled state
[   53.370681][ T5855] bridge_slave_1: entered allmulticast mode
[   53.377466][ T5855] bridge_slave_1: entered promiscuous mode
[   53.389405][ T5855] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   53.400348][ T5855] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   53.416700][ T5855] team0: Port device team_slave_0 added
[   53.423294][ T5855] team0: Port device team_slave_1 added
[   53.433309][ T5855] batman_adv: batadv0: Adding interface: batadv_slave_0
[   53.440612][ T5855] 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.
[   53.467851][ T5855] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   53.481327][ T5855] batman_adv: batadv0: Adding interface: batadv_slave_1
[   53.488635][ T5855] 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.
[   53.516002][ T5855] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   53.535524][ T5855] hsr_slave_0: entered promiscuous mode
[   53.541713][ T5855] hsr_slave_1: entered promiscuous mode
[   53.574372][ T5855] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   53.583517][ T5855] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   53.591751][ T5855] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   53.600646][ T5855] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   53.614549][ T5855] bridge0: port 2(bridge_slave_1) entered blocking state
[   53.622088][ T5855] bridge0: port 2(bridge_slave_1) entered forwarding state
[   53.630043][ T5855] bridge0: port 1(bridge_slave_0) entered blocking state
[   53.637781][ T5855] bridge0: port 1(bridge_slave_0) entered forwarding state
[   53.660522][ T5855] 8021q: adding VLAN 0 to HW filter on device bond0
[   53.670073][ T3650] bridge0: port 1(bridge_slave_0) entered disabled state
[   53.678501][ T3650] bridge0: port 2(bridge_slave_1) entered disabled state
[   53.688598][ T5855] 8021q: adding VLAN 0 to HW filter on device team0
[   53.697705][ T1326] bridge0: port 1(bridge_slave_0) entered blocking state
[   53.704973][ T1326] bridge0: port 1(bridge_slave_0) entered forwarding state
[   53.714642][ T1326] bridge0: port 2(bridge_slave_1) entered blocking state
[   53.721984][ T1326] bridge0: port 2(bridge_slave_1) entered forwarding state
[   53.763780][ T5855] 8021q: adding VLAN 0 to HW filter on device batadv0
[   53.780112][ T5855] veth0_vlan: entered promiscuous mode
[   53.787498][ T5855] veth1_vlan: entered promiscuous mode
[   53.799529][ T5855] veth0_macvtap: entered promiscuous mode
[   53.807519][ T5855] veth1_macvtap: entered promiscuous mode
[   53.818491][ T5855] batman_adv: batadv0: Interface activated: batadv_slave_0
[   53.829013][ T5855] batman_adv: batadv0: Interface activated: batadv_slave_1
[   53.839887][ T1326] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   53.850698][ T1326] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   53.861035][ T1326] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   53.871232][ T1326] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   53.906896][ T1326] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   53.966995][ T1326] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   53.995814][ T1326] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   54.034202][ T1326] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   54.159038][ T2114] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   54.167245][ T2114] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   54.178245][ T2114] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   54.186557][ T2114] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
2026/01/16 03:01:16 executed programs: 0
[   56.923092][ T1326] bridge_slave_1: left allmulticast mode
[   56.928869][ T1326] bridge_slave_1: left promiscuous mode
[   56.934672][ T1326] bridge0: port 2(bridge_slave_1) entered disabled state
[   56.942646][ T1326] bridge_slave_0: left allmulticast mode
[   56.948885][ T1326] bridge_slave_0: left promiscuous mode
[   56.954803][ T1326] bridge0: port 1(bridge_slave_0) entered disabled state
[   57.005555][ T1326] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   57.016763][ T1326] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   57.026927][ T1326] bond0 (unregistering): Released all slaves
[   57.095657][ T1326] hsr_slave_0: left promiscuous mode
[   57.101342][ T1326] hsr_slave_1: left promiscuous mode
[   57.107620][ T1326] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   57.115348][ T1326] batman_adv: batadv0: Removing interface: batadv_slave_0
[   57.123767][ T1326] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   57.131458][ T1326] batman_adv: batadv0: Removing interface: batadv_slave_1
[   57.140538][ T1326] veth1_macvtap: left promiscuous mode
[   57.146257][ T1326] veth0_macvtap: left promiscuous mode
[   57.152195][ T1326] veth1_vlan: left promiscuous mode
[   57.157593][ T1326] veth0_vlan: left promiscuous mode
[   57.181303][ T1326] team0 (unregistering): Port device team_slave_1 removed
[   57.191493][ T1326] team0 (unregistering): Port device team_slave_0 removed
[   60.054828][ T5138] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   60.062525][ T5138] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   60.070581][ T5138] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   60.078714][ T5138] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   60.086705][ T5138] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   60.122310][ T5991] chnl_net:caif_netlink_parms(): no params data found
[   60.142671][ T5991] bridge0: port 1(bridge_slave_0) entered blocking state
[   60.151380][ T5991] bridge0: port 1(bridge_slave_0) entered disabled state
[   60.159631][ T5991] bridge_slave_0: entered allmulticast mode
[   60.166599][ T5991] bridge_slave_0: entered promiscuous mode
[   60.173566][ T5991] bridge0: port 2(bridge_slave_1) entered blocking state
[   60.180823][ T5991] bridge0: port 2(bridge_slave_1) entered disabled state
[   60.188212][ T5991] bridge_slave_1: entered allmulticast mode
[   60.194588][ T5991] bridge_slave_1: entered promiscuous mode
[   60.206157][ T5991] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   60.216527][ T5991] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   60.230103][ T5991] team0: Port device team_slave_0 added
[   60.236725][ T5991] team0: Port device team_slave_1 added
[   60.246712][ T5991] batman_adv: batadv0: Adding interface: batadv_slave_0
[   60.254114][ T5991] 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.
[   60.281073][ T5991] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   60.292352][ T5991] batman_adv: batadv0: Adding interface: batadv_slave_1
[   60.299876][ T5991] 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.
[   60.326817][ T5991] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   60.344691][ T5991] hsr_slave_0: entered promiscuous mode
[   60.350528][ T5991] hsr_slave_1: entered promiscuous mode
[   60.547249][ T5991] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   60.556770][ T5991] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   60.565261][ T5991] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   60.574345][ T5991] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   60.595999][ T5991] bridge0: port 2(bridge_slave_1) entered blocking state
[   60.603416][ T5991] bridge0: port 2(bridge_slave_1) entered forwarding state
[   60.610769][ T5991] bridge0: port 1(bridge_slave_0) entered blocking state
[   60.617975][ T5991] bridge0: port 1(bridge_slave_0) entered forwarding state
[   60.640024][ T5991] 8021q: adding VLAN 0 to HW filter on device bond0
[   60.651654][ T1326] bridge0: port 1(bridge_slave_0) entered disabled state
[   60.661595][ T1326] bridge0: port 2(bridge_slave_1) entered disabled state
[   60.672035][ T5991] 8021q: adding VLAN 0 to HW filter on device team0
[   60.681942][ T3533] bridge0: port 1(bridge_slave_0) entered blocking state
[   60.689121][ T3533] bridge0: port 1(bridge_slave_0) entered forwarding state
[   60.700374][ T3533] bridge0: port 2(bridge_slave_1) entered blocking state
[   60.707777][ T3533] bridge0: port 2(bridge_slave_1) entered forwarding state
[   60.765855][ T5991] 8021q: adding VLAN 0 to HW filter on device batadv0
[   60.785272][ T5991] veth0_vlan: entered promiscuous mode
[   60.794067][ T5991] veth1_vlan: entered promiscuous mode
[   60.813474][ T5991] veth0_macvtap: entered promiscuous mode
[   60.820492][ T5991] veth1_macvtap: entered promiscuous mode
[   60.830830][ T5991] batman_adv: batadv0: Interface activated: batadv_slave_0
[   60.844272][ T5991] batman_adv: batadv0: Interface activated: batadv_slave_1
[   60.859022][ T1326] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   60.868601][ T1326] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   60.882791][ T1326] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   60.895230][ T1326] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
[   60.917026][ T1326] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   60.930526][ T1326] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   60.943597][ T3533] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   60.951565][ T3533] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50


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-build224329181=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
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'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at d6526ea3e
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=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  ./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=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  -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   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d6526ea3e6ad9081c902859bbb80f9f840377cb4\"
/usr/bin/ld: /tmp/cczh2cP8.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
./tools/check-syzos.sh 2>/dev/null



Tested on:

commit:         983d014a kernel: modules: Add SPDX license identifier ..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=87bc41cae23d2144
dashboard link: https://syzkaller.appspot.com/bug?extid=3f2d46b6e62b8dd546d3
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16cae39a580000

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