Re: [syzbot] [fs?] WARNING in nsproxy_ns_active_put

syzbot
2025-11-11T11:02:03Z

Hello,

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

SYZFAIL: failed to recv rpc

SYZFAIL: failed to recv rpc

Warning: Permanently added '10.128.1.29' (ED25519) to the list of known hosts.
2025/11/11 11:01:12 parsed 1 programs
[ 92.366829][ T894] cfg80211: failed to load regulatory.db
[ 94.101317][ T5831] cgroup: Unknown subsys name 'net'
[ 94.208868][ T5831] cgroup: Unknown subsys name 'cpuset'
[ 94.218695][ T5831] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[ 95.913996][ T5831] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k
[ 99.210494][ T5845] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
[ 99.368014][ T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 99.376801][ T52] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[ 99.385991][ T52] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[ 99.394090][ T52] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[ 99.403295][ T52] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[ 99.760048][ T67] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 99.769465][ T67] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 99.812956][ T13] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 99.820978][ T13] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 101.094305][ T5880] chnl_net:caif_netlink_parms(): no params data found
[ 101.244059][ T5880] bridge0: port 1(bridge_slave_0) entered blocking state
[ 101.252746][ T5880] bridge0: port 1(bridge_slave_0) entered disabled state
[ 101.261818][ T5880] bridge_slave_0: entered allmulticast mode
[ 101.270392][ T5880] bridge_slave_0: entered promiscuous mode
[ 101.283473][ T5880] bridge0: port 2(bridge_slave_1) entered blocking state
[ 101.291198][ T5880] bridge0: port 2(bridge_slave_1) entered disabled state
[ 101.298667][ T5880] bridge_slave_1: entered allmulticast mode
[ 101.307108][ T5880] bridge_slave_1: entered promiscuous mode
[ 101.360560][ T5880] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 101.373330][ T5880] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 101.413565][ T5880] team0: Port device team_slave_0 added
[ 101.422832][ T5880] team0: Port device team_slave_1 added
[ 101.463069][ T5880] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 101.470261][ T5880] 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.
[ 101.497282][ T5880] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 101.511788][ T5880] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 101.518889][ T5880] 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.
[ 101.545058][ T5880] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 101.590841][ T5880] hsr_slave_0: entered promiscuous mode
[ 101.597434][ T5880] hsr_slave_1: entered promiscuous mode
[ 101.741572][ T5880] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 101.754163][ T5880] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 101.764799][ T5880] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 101.774770][ T5880] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 101.805511][ T5880] bridge0: port 2(bridge_slave_1) entered blocking state
[ 101.812788][ T5880] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 101.820983][ T5880] bridge0: port 1(bridge_slave_0) entered blocking state
[ 101.828371][ T5880] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 101.843110][ T13] bridge0: port 1(bridge_slave_0) entered disabled state
[ 101.851795][ T13] bridge0: port 2(bridge_slave_1) entered disabled state
[ 101.904027][ T5880] 8021q: adding VLAN 0 to HW filter on device bond0
[ 101.928006][ T5880] 8021q: adding VLAN 0 to HW filter on device team0
[ 101.942529][ T3448] bridge0: port 1(bridge_slave_0) entered blocking state
[ 101.950392][ T3448] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 101.964563][ T13] bridge0: port 2(bridge_slave_1) entered blocking state
[ 101.971799][ T13] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 102.152983][ T5880] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 102.197805][ T5880] veth0_vlan: entered promiscuous mode
[ 102.210102][ T5880] veth1_vlan: entered promiscuous mode
[ 102.244663][ T5880] veth0_macvtap: entered promiscuous mode
[ 102.254634][ T5880] veth1_macvtap: entered promiscuous mode
[ 102.273656][ T5880] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 102.289496][ T5880] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 102.304731][ T67] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 102.314238][ T67] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 102.324278][ T67] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 102.334159][ T67] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 102.469673][ T67] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 102.543054][ T67] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 102.622429][ T67] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 102.698368][ T67] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
2025/11/11 11:01:26 executed programs: 0
[ 104.788606][ T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 104.799432][ T52] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[ 104.807512][ T52] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[ 104.816410][ T52] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[ 104.824560][ T52] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[ 104.982601][ T5940] chnl_net:caif_netlink_parms(): no params data found
[ 105.059249][ T5940] bridge0: port 1(bridge_slave_0) entered blocking state
[ 105.066542][ T5940] bridge0: port 1(bridge_slave_0) entered disabled state
[ 105.073685][ T5940] bridge_slave_0: entered allmulticast mode
[ 105.081124][ T5940] bridge_slave_0: entered promiscuous mode
[ 105.089124][ T5940] bridge0: port 2(bridge_slave_1) entered blocking state
[ 105.096583][ T5940] bridge0: port 2(bridge_slave_1) entered disabled state
[ 105.104018][ T5940] bridge_slave_1: entered allmulticast mode
[ 105.111771][ T5940] bridge_slave_1: entered promiscuous mode
[ 105.143334][ T5940] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 105.155734][ T5940] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 105.191407][ T5940] team0: Port device team_slave_0 added
[ 105.201031][ T5940] team0: Port device team_slave_1 added
[ 105.235802][ T5940] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 105.242802][ T5940] 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.
[ 105.269608][ T5940] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 105.296300][ T5940] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 105.303516][ T5940] 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.
[ 105.331738][ T5940] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 105.417552][ T5940] hsr_slave_0: entered promiscuous mode
[ 105.424204][ T5940] hsr_slave_1: entered promiscuous mode
[ 105.430828][ T5940] debugfs: 'hsr0' already exists in 'hsr'
[ 105.437317][ T5940] Cannot create hsr debugfs directory
[ 105.454873][ T67] bridge_slave_1: left allmulticast mode
[ 105.460813][ T67] bridge_slave_1: left promiscuous mode
[ 105.467853][ T67] bridge0: port 2(bridge_slave_1) entered disabled state
[ 105.479304][ T67] bridge_slave_0: left allmulticast mode
[ 105.485065][ T67] bridge_slave_0: left promiscuous mode
[ 105.491001][ T67] bridge0: port 1(bridge_slave_0) entered disabled state
[ 105.729562][ T67] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[ 105.741503][ T67] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[ 105.752583][ T67] bond0 (unregistering): Released all slaves
[ 105.835828][ T67] hsr_slave_0: left promiscuous mode
[ 105.842862][ T67] hsr_slave_1: left promiscuous mode
[ 105.849433][ T67] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[ 105.857469][ T67] batman_adv: batadv0: Removing interface: batadv_slave_0
[ 105.865850][ T67] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[ 105.873344][ T67] batman_adv: batadv0: Removing interface: batadv_slave_1
[ 105.890846][ T67] veth1_macvtap: left promiscuous mode
[ 105.897610][ T67] veth0_macvtap: left promiscuous mode
[ 105.903553][ T67] veth1_vlan: left promiscuous mode
[ 105.910171][ T67] veth0_vlan: left promiscuous mode
[ 106.222498][ T67] team0 (unregistering): Port device team_slave_1 removed
[ 106.255035][ T67] team0 (unregistering): Port device team_slave_0 removed
[ 106.849861][ T52] Bluetooth: hci0: command tx timeout
[ 107.366951][ T5940] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 107.390747][ T5940] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 107.409101][ T5940] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 107.429220][ T5940] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 107.687917][ T5940] 8021q: adding VLAN 0 to HW filter on device bond0
[ 107.729157][ T5940] 8021q: adding VLAN 0 to HW filter on device team0
[ 107.757652][ T1309] bridge0: port 1(bridge_slave_0) entered blocking state
[ 107.764863][ T1309] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 107.814393][ T1309] bridge0: port 2(bridge_slave_1) entered blocking state
[ 107.821819][ T1309] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 108.188295][ T5940] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 108.234481][ T5940] veth0_vlan: entered promiscuous mode
[ 108.246943][ T5940] veth1_vlan: entered promiscuous mode
[ 108.277479][ T5940] veth0_macvtap: entered promiscuous mode
[ 108.288108][ T5940] veth1_macvtap: entered promiscuous mode
[ 108.306578][ T5940] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 108.321859][ T5940] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 108.336901][ T1322] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 108.346834][ T1322] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 108.358941][ T1322] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 108.368475][ T1322] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 108.430497][ T1309] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 108.438794][ T1309] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 108.474331][ T67] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 108.484170][ T67] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
SYZFAIL: failed to recv rpc

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-build3388558029=/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='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 4e1406b4def
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=4e1406b4defac0e2a9d9424c70706f79a7750cf3 -X github.com/google/syzkaller/prog.gitRevisionDate=20251106-151142" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=4e1406b4defac0e2a9d9424c70706f79a7750cf3 -X github.com/google/syzkaller/prog.gitRevisionDate=20251106-151142" ./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=4e1406b4defac0e2a9d9424c70706f79a7750cf3 -X github.com/google/syzkaller/prog.gitRevisionDate=20251106-151142" -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=\"4e1406b4defac0e2a9d9424c70706f79a7750cf3\"
/usr/bin/ld: /tmp/ccimHo7N.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: ae901e5e Merge patch series "ns: fixes for namespace i..
git tree: https://github.com/brauner/linux.git namespace-6.19.fixes
kernel config: https://syzkaller.appspot.com/x/.config?x=7b0bf36f88602817
dashboard link: https://syzkaller.appspot.com/bug?extid=0b2e79f91ff6579bfa5b
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Note: no patches were applied.