Message-ID: <6952726d.050a0220.3b1790.000a.GAE@google.com>
Date: Mon, 29 Dec 2025 04:22:05 -0800
From: syzbot <syzbot+05f9cecd28e356241aba@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, penguin-kernel@...ove.sakura.ne.jp, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] INFO: task hung in new_device_store (5)

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 '10.128.1.196' (ED25519) to the list of known hosts.
1970/01/01 00:00:27 parsed 1 programs
[   28.587108][ T6579] cgroup: Unknown subsys name 'net'
[   28.756941][ T6579] cgroup: Unknown subsys name 'cpuset'
[   28.758813][ T6579] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   28.919971][ T6579] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k SS
[   35.516222][ T6589] 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.
[   35.978864][  T159] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   35.978895][  T159] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   36.044988][ T6166] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   36.047088][ T6166] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   36.055304][ T6166] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   36.058255][ T6166] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   36.071648][ T6166] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   36.125812][  T159] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   36.125845][  T159] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   36.374877][ T6626] chnl_net:caif_netlink_parms(): no params data found
[   36.592412][ T6626] bridge0: port 1(bridge_slave_0) entered blocking state
[   36.593249][ T6626] bridge0: port 1(bridge_slave_0) entered disabled state
[   36.593313][ T6626] bridge_slave_0: entered allmulticast mode
[   36.593796][ T6626] bridge_slave_0: entered promiscuous mode
[   36.596258][ T6626] bridge0: port 2(bridge_slave_1) entered blocking state
[   36.596305][ T6626] bridge0: port 2(bridge_slave_1) entered disabled state
[   36.596352][ T6626] bridge_slave_1: entered allmulticast mode
[   36.596819][ T6626] bridge_slave_1: entered promiscuous mode
[   36.619108][ T6626] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   36.621721][ T6626] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   36.634265][ T6626] team0: Port device team_slave_0 added
[   36.636612][ T6626] team0: Port device team_slave_1 added
[   36.644107][ T6626] batman_adv: batadv0: Adding interface: batadv_slave_0
[   36.645329][ T6626] 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.
[   36.649731][ T6626] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   36.652386][ T6626] batman_adv: batadv0: Adding interface: batadv_slave_1
[   36.653590][ T6626] 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.
[   36.655666][ T6626] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   36.666248][ T6626] hsr_slave_0: entered promiscuous mode
[   36.666595][ T6626] hsr_slave_1: entered promiscuous mode
[   36.753120][ T6626] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   36.756203][ T6626] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   36.758279][ T6626] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   36.760667][ T6626] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   36.803479][ T6626] bridge0: port 2(bridge_slave_1) entered blocking state
[   36.803528][ T6626] bridge0: port 2(bridge_slave_1) entered forwarding state
[   36.803722][ T6626] bridge0: port 1(bridge_slave_0) entered blocking state
[   36.803750][ T6626] bridge0: port 1(bridge_slave_0) entered forwarding state
[   36.854884][ T6626] 8021q: adding VLAN 0 to HW filter on device bond0
[   36.859993][  T159] bridge0: port 1(bridge_slave_0) entered disabled state
[   36.861382][  T159] bridge0: port 2(bridge_slave_1) entered disabled state
[   36.865187][ T6626] 8021q: adding VLAN 0 to HW filter on device team0
[   36.867643][ T3491] bridge0: port 1(bridge_slave_0) entered blocking state
[   36.867695][ T3491] bridge0: port 1(bridge_slave_0) entered forwarding state
[   36.870433][  T545] bridge0: port 2(bridge_slave_1) entered blocking state
[   36.870471][  T545] bridge0: port 2(bridge_slave_1) entered forwarding state
[   36.934955][ T6626] 8021q: adding VLAN 0 to HW filter on device batadv0
[   37.167588][ T6626] veth0_vlan: entered promiscuous mode
[   37.175536][ T6626] veth1_vlan: entered promiscuous mode
[   37.191057][ T6626] veth0_macvtap: entered promiscuous mode
[   37.192370][ T6626] veth1_macvtap: entered promiscuous mode
[   37.196843][ T6626] batman_adv: batadv0: Interface activated: batadv_slave_0
[   37.197846][ T6626] batman_adv: batadv0: Interface activated: batadv_slave_1
[   37.200875][  T159] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   37.200992][  T159] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   37.201141][  T159] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   37.201185][  T159] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
1970/01/01 00:00:37 executed programs: 0
[   37.309306][   T53] Bluetooth: hci1: unexpected cc 0x0c03 length: 249 > 1
[   37.309684][   T53] Bluetooth: hci1: unexpected cc 0x1003 length: 249 > 9
[   37.309883][   T53] Bluetooth: hci1: unexpected cc 0x1001 length: 249 > 9
[   37.310161][   T53] Bluetooth: hci1: unexpected cc 0x0c23 length: 249 > 4
[   37.310337][   T53] Bluetooth: hci1: unexpected cc 0x0c38 length: 249 > 2
[   37.514704][ T1366] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   37.554267][ T6682] chnl_net:caif_netlink_parms(): no params data found
[   37.564112][ T1366] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   37.581915][ T6682] bridge0: port 1(bridge_slave_0) entered blocking state
[   37.581991][ T6682] bridge0: port 1(bridge_slave_0) entered disabled state
[   37.582049][ T6682] bridge_slave_0: entered allmulticast mode
[   37.582474][ T6682] bridge_slave_0: entered promiscuous mode
[   37.583268][ T6682] bridge0: port 2(bridge_slave_1) entered blocking state
[   37.583307][ T6682] bridge0: port 2(bridge_slave_1) entered disabled state
[   37.583350][ T6682] bridge_slave_1: entered allmulticast mode
[   37.583760][ T6682] bridge_slave_1: entered promiscuous mode
[   37.595348][ T6682] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   37.596932][ T6682] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   37.604100][ T6682] team0: Port device team_slave_0 added
[   37.604832][ T6682] team0: Port device team_slave_1 added
[   37.617153][ T1366] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   37.619414][ T6682] batman_adv: batadv0: Adding interface: batadv_slave_0
[   37.619437][ T6682] 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.
[   37.619457][ T6682] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   37.622039][ T6682] batman_adv: batadv0: Adding interface: batadv_slave_1
[   37.622049][ T6682] 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.
[   37.622061][ T6682] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   37.639284][ T6682] hsr_slave_0: entered promiscuous mode
[   37.639597][ T6682] hsr_slave_1: entered promiscuous mode
[   37.639790][ T6682] debugfs: 'hsr0' already exists in 'hsr'
[   37.639826][ T6682] Cannot create hsr debugfs directory
[   37.665722][ T1366] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   38.106033][   T53] Bluetooth: hci0: command tx timeout
[   39.385559][   T53] Bluetooth: hci1: command tx timeout
[   40.185525][   T53] Bluetooth: hci0: command tx timeout
[   40.385032][ T1366] bridge_slave_1: left allmulticast mode
[   40.386305][ T1366] bridge_slave_1: left promiscuous mode
[   40.386610][ T1366] bridge0: port 2(bridge_slave_1) entered disabled state
[   40.390053][ T1366] bridge_slave_0: left allmulticast mode
[   40.390074][ T1366] bridge_slave_0: left promiscuous mode
[   40.390267][ T1366] bridge0: port 1(bridge_slave_0) entered disabled state
[   40.539319][ T1366] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   40.567429][ T1366] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   40.596300][ T1366] bond0 (unregistering): Released all slaves
[   40.649297][ T1366] hsr_slave_0: left promiscuous mode
[   40.650623][ T1366] hsr_slave_1: left promiscuous mode
[   40.651942][ T1366] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   40.653153][ T1366] batman_adv: batadv0: Removing interface: batadv_slave_0
[   40.655644][ T1366] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   40.656846][ T1366] batman_adv: batadv0: Removing interface: batadv_slave_1
[   40.666436][ T1366] veth1_macvtap: left promiscuous mode
[   40.667483][ T1366] veth0_macvtap: left promiscuous mode
[   40.668746][ T1366] veth1_vlan: left promiscuous mode
[   40.669606][ T1366] veth0_vlan: left promiscuous mode
[   40.790081][ T1366] team0 (unregistering): Port device team_slave_1 removed
[   40.796560][ T1366] team0 (unregistering): Port device team_slave_0 removed
[   41.003460][ T6682] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   41.007225][ T6682] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   41.009214][ T6682] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   41.011410][ T6682] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   41.037855][ T6682] 8021q: adding VLAN 0 to HW filter on device bond0
[   41.040503][ T6682] 8021q: adding VLAN 0 to HW filter on device team0
[   41.043546][ T3491] bridge0: port 1(bridge_slave_0) entered blocking state
[   41.043578][ T3491] bridge0: port 1(bridge_slave_0) entered forwarding state
[   41.045430][ T3491] bridge0: port 2(bridge_slave_1) entered blocking state
[   41.045446][ T3491] bridge0: port 2(bridge_slave_1) entered forwarding state
[   41.053400][ T6682] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
[   41.053432][ T6682] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
[   41.096928][ T6682] 8021q: adding VLAN 0 to HW filter on device batadv0
[   41.127286][ T6682] veth0_vlan: entered promiscuous mode
[   41.131983][ T6682] veth1_vlan: entered promiscuous mode
[   41.142065][ T6682] veth0_macvtap: entered promiscuous mode
[   41.143005][ T6682] veth1_macvtap: entered promiscuous mode
[   41.146977][ T6682] batman_adv: batadv0: Interface activated: batadv_slave_0
[   41.147898][ T6682] batman_adv: batadv0: Interface activated: batadv_slave_1
[   41.150332][ T3491] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   41.150452][ T3491] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   41.150552][ T3491] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   41.150686][ T3491] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   41.172012][ T3491] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   41.173623][ T3491] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   41.182043][ T6042] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   41.182068][ T6042] 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)


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-build3690632989=/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=arm64 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_arm64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_arm64
aarch64-linux-gnu-g++ -o ./bin/linux_arm64/syz-executor executor/executor.cc \
	-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_arm64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d6526ea3e6ad9081c902859bbb80f9f840377cb4\"
/usr/lib/gcc-cross/aarch64-linux-gnu/12/../../../../aarch64-linux-gnu/bin/ld: /tmp/cctOvHer.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0xd8): 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:         8f0b4cce Linux 6.19-rc1
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
kernel config:  https://syzkaller.appspot.com/x/.config?x=8a8594efdc14f07a
dashboard link: https://syzkaller.appspot.com/bug?extid=05f9cecd28e356241aba
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15d0f894580000

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