Message-ID: <693f3db2.a70a0220.104cf0.0332.GAE@google.com>
Date: Sun, 14 Dec 2025 14:44:02 -0800
From: syzbot <syzbot+1c70732df5fd4f0e4fbb@...kaller.appspotmail.com>
To: eraykrdg1@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] memory leak in adfs_init_fs_context

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 '10.128.1.213' (ED25519) to the list of known hosts.
2025/12/14 22:43:18 parsed 1 programs
[   37.712373][ T5814] cgroup: Unknown subsys name 'net'
[   37.852708][ T5814] cgroup: Unknown subsys name 'cpuset'
[   37.858990][ T5814] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   45.793734][ T5814] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   47.027391][ T5825] 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.
[   47.298490][ T5848] chnl_net:caif_netlink_parms(): no params data found
[   47.317351][ T5848] bridge0: port 1(bridge_slave_0) entered blocking state
[   47.324739][ T5848] bridge0: port 1(bridge_slave_0) entered disabled state
[   47.331833][ T5848] bridge_slave_0: entered allmulticast mode
[   47.338011][ T5848] bridge_slave_0: entered promiscuous mode
[   47.344534][ T5848] bridge0: port 2(bridge_slave_1) entered blocking state
[   47.351584][ T5848] bridge0: port 2(bridge_slave_1) entered disabled state
[   47.358656][ T5848] bridge_slave_1: entered allmulticast mode
[   47.364787][ T5848] bridge_slave_1: entered promiscuous mode
[   47.376139][ T5848] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   47.385864][ T5848] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   47.398694][ T5848] team0: Port device team_slave_0 added
[   47.404689][ T5848] team0: Port device team_slave_1 added
[   47.418227][ T5848] batman_adv: batadv0: Adding interface: batadv_slave_0
[   47.425170][ T5848] 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.
[   47.451033][ T5848] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   47.461955][ T5848] batman_adv: batadv0: Adding interface: batadv_slave_1
[   47.468871][ T5848] 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.
[   47.494836][ T5848] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   47.511287][ T5848] hsr_slave_0: entered promiscuous mode
[   47.517050][ T5848] hsr_slave_1: entered promiscuous mode
[   47.544260][ T5848] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   47.551678][ T5848] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   47.559215][ T5848] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   47.567128][ T5848] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   47.579629][ T5848] bridge0: port 2(bridge_slave_1) entered blocking state
[   47.586718][ T5848] bridge0: port 2(bridge_slave_1) entered forwarding state
[   47.593955][ T5848] bridge0: port 1(bridge_slave_0) entered blocking state
[   47.600960][ T5848] bridge0: port 1(bridge_slave_0) entered forwarding state
[   47.617557][ T5848] 8021q: adding VLAN 0 to HW filter on device bond0
[   47.626433][ T2113] bridge0: port 1(bridge_slave_0) entered disabled state
[   47.634115][ T2113] bridge0: port 2(bridge_slave_1) entered disabled state
[   47.643636][ T5848] 8021q: adding VLAN 0 to HW filter on device team0
[   47.651827][   T58] bridge0: port 1(bridge_slave_0) entered blocking state
[   47.658866][   T58] bridge0: port 1(bridge_slave_0) entered forwarding state
[   47.667451][ T2113] bridge0: port 2(bridge_slave_1) entered blocking state
[   47.674493][ T2113] bridge0: port 2(bridge_slave_1) entered forwarding state
[   47.712493][ T5848] 8021q: adding VLAN 0 to HW filter on device batadv0
[   47.726799][ T5848] veth0_vlan: entered promiscuous mode
[   47.733467][ T5848] veth1_vlan: entered promiscuous mode
[   47.743510][ T5848] veth0_macvtap: entered promiscuous mode
[   47.749952][ T5848] veth1_macvtap: entered promiscuous mode
[   47.758532][ T5848] batman_adv: batadv0: Interface activated: batadv_slave_0
[   47.767484][ T5848] batman_adv: batadv0: Interface activated: batadv_slave_1
[   47.776289][ T2113] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   47.785155][ T2113] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   47.793957][ T2113] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   47.803186][ T2113] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   47.857905][   T35] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   47.893462][   T35] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   47.943714][   T35] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   48.003482][   T35] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   48.014825][   T58] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   48.024771][   T58] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   48.034932][ T1938] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   48.042907][ T1938] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   48.069136][ T5135] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   48.082403][ T5135] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   48.089470][ T5135] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   48.097107][ T5135] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   48.104358][ T5135] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
2025/12/14 22:43:30 executed programs: 0
[   50.851981][   T35] bridge_slave_1: left allmulticast mode
[   50.857735][   T35] bridge_slave_1: left promiscuous mode
[   50.863350][   T35] bridge0: port 2(bridge_slave_1) entered disabled state
[   50.870740][   T35] bridge_slave_0: left allmulticast mode
[   50.876445][   T35] bridge_slave_0: left promiscuous mode
[   50.882278][   T35] bridge0: port 1(bridge_slave_0) entered disabled state
[   50.943824][   T35] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   50.952823][   T35] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   50.961629][   T35] bond0 (unregistering): Released all slaves
[   51.016728][   T35] hsr_slave_0: left promiscuous mode
[   51.022435][   T35] hsr_slave_1: left promiscuous mode
[   51.027855][   T35] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   51.035519][   T35] batman_adv: batadv0: Removing interface: batadv_slave_0
[   51.042948][   T35] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   51.050311][   T35] batman_adv: batadv0: Removing interface: batadv_slave_1
[   51.058439][   T35] veth1_macvtap: left promiscuous mode
[   51.063920][   T35] veth0_macvtap: left promiscuous mode
[   51.069372][   T35] veth1_vlan: left promiscuous mode
[   51.074576][   T35] veth0_vlan: left promiscuous mode
[   51.096386][   T35] team0 (unregistering): Port device team_slave_1 removed
[   51.104418][   T35] team0 (unregistering): Port device team_slave_0 removed
[   53.746742][   T50] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   53.753850][   T50] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   53.760895][   T50] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   53.768537][   T50] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   53.775682][   T50] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   53.808761][ T5985] chnl_net:caif_netlink_parms(): no params data found
[   53.826975][ T5985] bridge0: port 1(bridge_slave_0) entered blocking state
[   53.834029][ T5985] bridge0: port 1(bridge_slave_0) entered disabled state
[   53.841055][ T5985] bridge_slave_0: entered allmulticast mode
[   53.847228][ T5985] bridge_slave_0: entered promiscuous mode
[   53.853510][ T5985] bridge0: port 2(bridge_slave_1) entered blocking state
[   53.861516][ T5985] bridge0: port 2(bridge_slave_1) entered disabled state
[   53.868608][ T5985] bridge_slave_1: entered allmulticast mode
[   53.874881][ T5985] bridge_slave_1: entered promiscuous mode
[   53.885891][ T5985] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   53.895676][ T5985] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   53.908861][ T5985] team0: Port device team_slave_0 added
[   53.914938][ T5985] team0: Port device team_slave_1 added
[   53.924223][ T5985] batman_adv: batadv0: Adding interface: batadv_slave_0
[   53.931143][ T5985] 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.
[   53.957319][ T5985] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   53.968209][ T5985] batman_adv: batadv0: Adding interface: batadv_slave_1
[   53.975179][ T5985] 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.
[   54.001082][ T5985] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   54.017628][ T5985] hsr_slave_0: entered promiscuous mode
[   54.023372][ T5985] hsr_slave_1: entered promiscuous mode
[   54.191291][ T5985] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   54.199056][ T5985] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   54.207354][ T5985] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   54.215704][ T5985] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   54.230450][ T5985] bridge0: port 2(bridge_slave_1) entered blocking state
[   54.237523][ T5985] bridge0: port 2(bridge_slave_1) entered forwarding state
[   54.244770][ T5985] bridge0: port 1(bridge_slave_0) entered blocking state
[   54.251818][ T5985] bridge0: port 1(bridge_slave_0) entered forwarding state
[   54.272254][ T5985] 8021q: adding VLAN 0 to HW filter on device bond0
[   54.282436][   T35] bridge0: port 1(bridge_slave_0) entered disabled state
[   54.289785][   T35] bridge0: port 2(bridge_slave_1) entered disabled state
[   54.300458][ T5985] 8021q: adding VLAN 0 to HW filter on device team0
[   54.309349][  T989] bridge0: port 1(bridge_slave_0) entered blocking state
[   54.316418][  T989] bridge0: port 1(bridge_slave_0) entered forwarding state
[   54.330130][   T35] bridge0: port 2(bridge_slave_1) entered blocking state
[   54.337171][   T35] bridge0: port 2(bridge_slave_1) entered forwarding state
[   54.399081][ T5985] 8021q: adding VLAN 0 to HW filter on device batadv0
[   54.416251][ T5985] veth0_vlan: entered promiscuous mode
[   54.423550][ T5985] veth1_vlan: entered promiscuous mode
[   54.436241][ T5985] veth0_macvtap: entered promiscuous mode
[   54.443995][ T5985] veth1_macvtap: entered promiscuous mode
[   54.453630][ T5985] batman_adv: batadv0: Interface activated: batadv_slave_0
[   54.463191][ T5985] batman_adv: batadv0: Interface activated: batadv_slave_1
[   54.473958][   T35] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   54.485525][   T35] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   54.495458][   T35] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   54.504485][   T35] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   54.524250][  T989] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   54.536235][  T989] wlan0: 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)
[   54.547638][  T989] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   54.555615][  T989] 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-build3573500242=/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/cc0hxglS.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:         8f0b4cce Linux 6.19-rc1
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=d60836e327fd6756
dashboard link: https://syzkaller.appspot.com/bug?extid=1c70732df5fd4f0e4fbb
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=14e1811a580000

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