Re: [syzbot] [mmc?] WARNING: ODEBUG bug in vub300_disconnect

[syzbot <syzbot+f4a0159ce6802a0a4774@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 '[localhost]:50937' (ED25519) to the list of known hosts.
2026/09/15 02:54:08 parsed 1 programs
2026/09/15 02:54:08 serving rpc on tcp://40509
[   51.018830][ T5747] cgroup: Unknown subsys name 'net'
[   51.127646][ T5747] cgroup: Unknown subsys name 'cpuset'
[   51.131500][ T5747] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   52.520450][ T5747] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   55.451428][ T5757] 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.
[   55.490979][   T46] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   55.490999][   T46] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   55.492341][ T5757] ebtables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   55.510392][ T5757] arp_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   55.641838][   T46] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   55.641860][   T46] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   56.829529][   T66] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   56.830575][   T66] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   56.831401][   T66] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   56.832139][   T66] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   56.832528][   T66] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   56.932617][ T5802] ip_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   56.932896][ T5802] ip6_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[   57.032911][ T5769] bridge0: port 1(bridge_slave_0) entered blocking state
[   57.033003][ T5769] bridge0: port 1(bridge_slave_0) entered disabled state
[   57.033119][ T5769] bridge_slave_0: entered allmulticast mode
[   57.034729][ T5769] bridge_slave_0: entered promiscuous mode
[   57.039314][ T5769] bridge0: port 2(bridge_slave_1) entered blocking state
[   57.039361][ T5769] bridge0: port 2(bridge_slave_1) entered disabled state
[   57.039450][ T5769] bridge_slave_1: entered allmulticast mode
[   57.040442][ T5769] bridge_slave_1: entered promiscuous mode
[   57.119251][ T5769] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   57.137264][ T5769] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   57.350160][ T5769] team0: Port device team_slave_0 added
[   57.362939][ T5769] team0: Port device team_slave_1 added
[   57.417359][ T5769] batman_adv: batadv0: Adding interface: batadv_slave_0
[   57.417377][ T5769] 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.
[   57.417396][ T5769] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   57.430308][ T5769] batman_adv: batadv0: Adding interface: batadv_slave_1
[   57.430327][ T5769] 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.
[   57.430354][ T5769] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   57.605499][ T5769] hsr_slave_0: entered promiscuous mode
[   57.606694][ T5769] hsr_slave_1: entered promiscuous mode
[   57.976208][ T5769] netdevsim netdevsim5 netdevsim0: renamed from eth0
[   57.987128][ T5769] 8021q: adding VLAN 0 to HW filter on device netdevsim0
[   57.988702][ T5769] netdevsim netdevsim5 netdevsim1: renamed from eth1
[   57.992159][ T5769] 8021q: adding VLAN 0 to HW filter on device netdevsim1
[   57.993845][ T5769] netdevsim netdevsim5 netdevsim2: renamed from eth2
[   58.000578][ T5769] 8021q: adding VLAN 0 to HW filter on device netdevsim2
[   58.004100][ T5769] netdevsim netdevsim5 netdevsim3: renamed from eth3
[   58.012316][ T5769] 8021q: adding VLAN 0 to HW filter on device netdevsim3
[   58.103684][ T5769] 8021q: adding VLAN 0 to HW filter on device bond0
[   58.119294][ T5769] 8021q: adding VLAN 0 to HW filter on device team0
[   58.128805][   T37] bridge0: port 1(bridge_slave_0) entered blocking state
[   58.128939][   T37] bridge0: port 1(bridge_slave_0) entered forwarding state
[   58.131296][   T37] bridge0: port 2(bridge_slave_1) entered blocking state
[   58.131377][   T37] bridge0: port 2(bridge_slave_1) entered forwarding state
[   58.510343][ T5769] 8021q: adding VLAN 0 to HW filter on device batadv0
[   58.677549][ T5769] veth0_vlan: entered promiscuous mode
[   58.685197][ T5769] veth1_vlan: entered promiscuous mode
[   58.711173][ T5769] veth0_macvtap: entered promiscuous mode
[   58.715695][ T5769] veth1_macvtap: entered promiscuous mode
[   58.730261][ T5769] batman_adv: batadv0: Interface activated: batadv_slave_0
[   58.738604][ T5769] batman_adv: batadv0: Interface activated: batadv_slave_1
[   58.775395][   T13] netdevsim netdevsim5 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   58.776413][   T13] netdevsim netdevsim5 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   58.776445][   T13] netdevsim netdevsim5 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   58.776473][   T13] netdevsim netdevsim5 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   58.837077][ T5784] netdevsim netdevsim5 netdevsim3 (unregistering): unset [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)
execution of simple program fails: NOTFAIL: arptable checkpoint: getsockopt(ARPT_SO_GET_ENTRIES) failed. table=filter (errno 22: Invalid argument).
[   59.005630][ T5784] netdevsim netdevsim5 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   59.117565][ T5784] netdevsim netdevsim5 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   59.176795][ T5784] netdevsim netdevsim5 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   60.017438][ T5784] bridge_slave_1: left allmulticast mode
[   60.017469][ T5784] bridge_slave_1: left promiscuous mode
[   60.018373][ T5784] bridge0: port 2(bridge_slave_1) entered disabled state
[   60.023532][ T5784] bridge_slave_0: left allmulticast mode
[   60.023546][ T5784] bridge_slave_0: left promiscuous mode
[   60.023645][ T5784] bridge0: port 1(bridge_slave_0) entered disabled state
[   60.151598][ T5784] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   60.156955][ T5784] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   60.158031][ T5784] bond0 (unregistering): Released all slaves
[   60.230072][ T5784] hsr_slave_0: left promiscuous mode
[   60.230565][ T5784] hsr_slave_1: left promiscuous mode
[   60.230997][ T5784] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   60.231012][ T5784] batman_adv: batadv0: Removing interface: batadv_slave_0
[   60.231870][ T5784] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   60.231879][ T5784] batman_adv: batadv0: Removing interface: batadv_slave_1
[   60.237922][ T5784] veth1_macvtap: left promiscuous mode
[   60.238016][ T5784] veth0_macvtap: left promiscuous mode
[   60.238146][ T5784] veth1_vlan: left promiscuous mode
[   60.238231][ T5784] veth0_vlan: left promiscuous mode
[   60.377488][ T5784] team0 (unregistering): Port device team_slave_1 removed
[   60.388544][ T5784] team0 (unregistering): Port device team_slave_0 removed
[   60.447040][ T5451] 8021q: adding VLAN 0 to HW filter on device eth2
[   60.654287][ T5451] 8021q: adding VLAN 0 to HW filter on device eth4
[   60.861929][ T5451] 8021q: adding VLAN 0 to HW filter on device eth3
[   61.026589][ T5451] 8021q: adding VLAN 0 to HW filter on device eth5


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-build1170068323=/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 1fe56c0af80
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=1fe56c0af80df10ab9f07819d9fa709dc9971ae1 -X github.com/google/syzkaller/prog.gitRevisionDate=20260910-094642"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=1fe56c0af80df10ab9f07819d9fa709dc9971ae1 -X github.com/google/syzkaller/prog.gitRevisionDate=20260910-094642"  ./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=1fe56c0af80df10ab9f07819d9fa709dc9971ae1 -X github.com/google/syzkaller/prog.gitRevisionDate=20260910-094642"  -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=\"1fe56c0af80df10ab9f07819d9fa709dc9971ae1\"
/usr/bin/ld: /tmp/ccbm6IKO.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=85bc5cc2fc7394d9
dashboard link: https://syzkaller.appspot.com/bug?extid=f4a0159ce6802a0a4774
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14978df9580000