Message-ID: <69539d7b.050a0220.329c0f.0569.GAE@google.com>
Date: Tue, 30 Dec 2025 01:38:03 -0800
From: syzbot <syzbot+05f9cecd28e356241aba@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	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 '10.128.1.232' (ED25519) to the list of known hosts.
1970/01/01 00:00:31 parsed 1 programs
[   32.471623][ T6575] cgroup: Unknown subsys name 'net'
[   32.602037][ T6575] cgroup: Unknown subsys name 'cpuset'
[   32.604289][ T6575] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   32.779944][ T6575] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k SS
[   36.840617][ T6590] 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.
[   36.909920][  T599] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   36.911765][  T599] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   36.968895][ T6612] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   36.970758][ T6612] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   36.972197][ T6612] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   36.973473][   T13] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   36.973485][   T13] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   36.978733][ T6612] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   36.999923][ T6612] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   37.087028][ T6617] chnl_net:caif_netlink_parms(): no params data found
[   37.291730][ T6617] bridge0: port 1(bridge_slave_0) entered blocking state
[   37.293670][ T6617] bridge0: port 1(bridge_slave_0) entered disabled state
[   37.295614][ T6617] bridge_slave_0: entered allmulticast mode
[   37.297924][ T6617] bridge_slave_0: entered promiscuous mode
[   37.313046][ T6617] bridge0: port 2(bridge_slave_1) entered blocking state
[   37.314522][ T6617] bridge0: port 2(bridge_slave_1) entered disabled state
[   37.314662][ T6617] bridge_slave_1: entered allmulticast mode
[   37.317432][ T6617] bridge_slave_1: entered promiscuous mode
[   37.342493][ T6617] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   37.364082][ T6617] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   37.393439][ T6617] team0: Port device team_slave_0 added
[   37.445234][ T6617] team0: Port device team_slave_1 added
[   37.530482][ T6617] batman_adv: batadv0: Adding interface: batadv_slave_0
[   37.530542][ T6617] 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.
[   37.530571][ T6617] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   37.531578][ T6617] batman_adv: batadv0: Adding interface: batadv_slave_1
[   37.531585][ T6617] 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.
[   37.531597][ T6617] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   37.613066][ T6617] hsr_slave_0: entered promiscuous mode
[   37.613546][ T6617] hsr_slave_1: entered promiscuous mode
[   37.935809][ T6617] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   37.938615][ T6617] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   37.944230][ T6617] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   37.955917][ T6617] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   37.986946][ T6617] 8021q: adding VLAN 0 to HW filter on device bond0
[   37.994296][ T6617] 8021q: adding VLAN 0 to HW filter on device team0
[   37.996204][ T3257] bridge0: port 1(bridge_slave_0) entered blocking state
[   37.996240][ T3257] bridge0: port 1(bridge_slave_0) entered forwarding state
[   38.001927][   T13] bridge0: port 2(bridge_slave_1) entered blocking state
[   38.001962][   T13] bridge0: port 2(bridge_slave_1) entered forwarding state
[   38.157489][ T6617] 8021q: adding VLAN 0 to HW filter on device batadv0
[   38.225710][ T6617] veth0_vlan: entered promiscuous mode
[   38.227497][ T6617] veth1_vlan: entered promiscuous mode
[   38.234578][ T6617] veth0_macvtap: entered promiscuous mode
[   38.235624][ T6617] veth1_macvtap: entered promiscuous mode
[   38.239734][ T6617] batman_adv: batadv0: Interface activated: batadv_slave_0
[   38.240999][ T6617] batman_adv: batadv0: Interface activated: batadv_slave_1
[   38.245343][   T13] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   38.246933][   T13] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   38.248857][   T13] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   38.251096][   T13] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
1970/01/01 00:00:38 executed programs: 0
[   38.386255][   T53] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   38.388034][   T53] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   38.389544][   T53] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   38.391680][   T53] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   38.393243][   T53] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   38.625250][ T6681] chnl_net:caif_netlink_parms(): no params data found
[   38.878994][ T3257] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   38.881792][ T6681] bridge0: port 1(bridge_slave_0) entered blocking state
[   38.881870][ T6681] bridge0: port 1(bridge_slave_0) entered disabled state
[   38.881988][ T6681] bridge_slave_0: entered allmulticast mode
[   38.882458][ T6681] bridge_slave_0: entered promiscuous mode
[   38.883287][ T6681] bridge0: port 2(bridge_slave_1) entered blocking state
[   38.883307][ T6681] bridge0: port 2(bridge_slave_1) entered disabled state
[   38.883360][ T6681] bridge_slave_1: entered allmulticast mode
[   38.883761][ T6681] bridge_slave_1: entered promiscuous mode
[   38.896150][ T6681] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   38.897081][ T6681] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   38.905934][ T6681] team0: Port device team_slave_0 added
[   38.907754][ T6681] team0: Port device team_slave_1 added
[   38.915307][ T6681] batman_adv: batadv0: Adding interface: batadv_slave_0
[   38.915331][ T6681] 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.
[   38.915350][ T6681] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   38.915856][ T6681] batman_adv: batadv0: Adding interface: batadv_slave_1
[   38.915862][ T6681] 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.
[   38.915874][ T6681] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   38.936180][ T6681] hsr_slave_0: entered promiscuous mode
[   38.936515][ T6681] hsr_slave_1: entered promiscuous mode
[   38.936718][ T6681] debugfs: 'hsr0' already exists in 'hsr'
[   38.936758][ T6681] Cannot create hsr debugfs directory
[   38.943893][ T3257] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   38.985257][ T3257] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   39.035979][ T3257] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   40.430477][   T53] Bluetooth: hci0: command tx timeout
[   41.570853][ T3257] bridge_slave_1: left allmulticast mode
[   41.572709][ T3257] bridge_slave_1: left promiscuous mode
[   41.574227][ T3257] bridge0: port 2(bridge_slave_1) entered disabled state
[   41.577301][ T3257] bridge_slave_0: left allmulticast mode
[   41.577324][ T3257] bridge_slave_0: left promiscuous mode
[   41.577479][ T3257] bridge0: port 1(bridge_slave_0) entered disabled state
[   41.722713][ T3257] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   41.771484][ T3257] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   41.790991][ T3257] bond0 (unregistering): Released all slaves
[   41.865272][ T3257] hsr_slave_0: left promiscuous mode
[   41.866254][ T3257] hsr_slave_1: left promiscuous mode
[   41.866541][ T3257] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   41.866558][ T3257] batman_adv: batadv0: Removing interface: batadv_slave_0
[   41.867038][ T3257] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   41.867047][ T3257] batman_adv: batadv0: Removing interface: batadv_slave_1
[   41.872015][ T3257] veth1_macvtap: left promiscuous mode
[   41.872060][ T3257] veth0_macvtap: left promiscuous mode
[   41.872108][ T3257] veth1_vlan: left promiscuous mode
[   41.872153][ T3257] veth0_vlan: left promiscuous mode
[   41.995869][ T3257] team0 (unregistering): Port device team_slave_1 removed
[   42.002376][ T3257] team0 (unregistering): Port device team_slave_0 removed
[   42.386710][ T6681] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   42.391513][ T6681] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   42.394382][ T6681] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   42.397224][ T6681] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   42.435096][ T6681] 8021q: adding VLAN 0 to HW filter on device bond0
[   42.446667][ T6681] 8021q: adding VLAN 0 to HW filter on device team0
[   42.451278][  T819] bridge0: port 1(bridge_slave_0) entered blocking state
[   42.451317][  T819] bridge0: port 1(bridge_slave_0) entered forwarding state
[   42.453888][  T666] bridge0: port 2(bridge_slave_1) entered blocking state
[   42.453907][  T666] bridge0: port 2(bridge_slave_1) entered forwarding state
[   42.500707][   T53] Bluetooth: hci0: command tx timeout
[   42.511046][ T6681] 8021q: adding VLAN 0 to HW filter on device batadv0
[   42.521729][ T6681] veth0_vlan: entered promiscuous mode
[   42.524564][ T6681] veth1_vlan: entered promiscuous mode
[   42.533888][ T6681] veth0_macvtap: entered promiscuous mode
[   42.534904][ T6681] veth1_macvtap: entered promiscuous mode
[   42.538062][ T6681] batman_adv: batadv0: Interface activated: batadv_slave_0
[   42.541051][ T6681] batman_adv: batadv0: Interface activated: batadv_slave_1
[   42.544378][  T819] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   42.545881][  T819] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   42.547594][  T819] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   42.548994][  T819] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   42.575303][  T819] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   42.577497][  T819] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   42.585352][  T666] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   42.586324][  T666] 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-build1911780612=/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/ccHJUo9o.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:         8640b745 Merge tag 'kbuild-fixes-6.19-1' of git://git...
git tree:       upstream
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=1067949a580000

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