Message-ID: <69174abf.a70a0220.3124cb.0061.GAE@google.com>
Date: Fri, 14 Nov 2025 07:29:03 -0800
From: syzbot <syzbot+ad45f827c88778ff7df6@...kaller.appspotmail.com>
To: frank.li@...o.com, glaubitz@...sik.fu-berlin.de, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	mehdi.benhadjkhelifa@...il.com, slava@...eyko.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hfs?] memory leak in hfs_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 '10.128.1.80' (ED25519) to the list of known hosts.
2025/11/14 15:28:16 parsed 1 programs
[   40.296558][ T5813] cgroup: Unknown subsys name 'net'
[   40.388732][ T5813] cgroup: Unknown subsys name 'cpuset'
[   40.395379][ T5813] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   48.529645][ T5813] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   49.725319][ T5826] 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.
[   50.124830][ T5874] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   50.132081][ T5874] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   50.139390][ T5874] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   50.146668][ T5874] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   50.153951][ T5874] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   50.211546][ T5881] chnl_net:caif_netlink_parms(): no params data found
[   50.232138][ T5881] bridge0: port 1(bridge_slave_0) entered blocking state
[   50.239234][ T5881] bridge0: port 1(bridge_slave_0) entered disabled state
[   50.246331][ T5881] bridge_slave_0: entered allmulticast mode
[   50.252736][ T5881] bridge_slave_0: entered promiscuous mode
[   50.259377][ T5881] bridge0: port 2(bridge_slave_1) entered blocking state
[   50.266469][ T5881] bridge0: port 2(bridge_slave_1) entered disabled state
[   50.273698][ T5881] bridge_slave_1: entered allmulticast mode
[   50.279872][ T5881] bridge_slave_1: entered promiscuous mode
[   50.291361][ T5881] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   50.301121][ T5881] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   50.314859][ T5881] team0: Port device team_slave_0 added
[   50.321138][ T5881] team0: Port device team_slave_1 added
[   50.337350][ T5881] batman_adv: batadv0: Adding interface: batadv_slave_0
[   50.344455][ T5881] 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.
[   50.370408][ T5881] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   50.381546][ T5881] batman_adv: batadv0: Adding interface: batadv_slave_1
[   50.388602][ T5881] 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.
[   50.414701][ T5881] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   50.432432][ T5881] hsr_slave_0: entered promiscuous mode
[   50.438187][ T5881] hsr_slave_1: entered promiscuous mode
[   50.464974][ T5881] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   50.472557][ T5881] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   50.480523][ T5881] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   50.488191][ T5881] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   50.501383][ T5881] bridge0: port 2(bridge_slave_1) entered blocking state
[   50.508462][ T5881] bridge0: port 2(bridge_slave_1) entered forwarding state
[   50.515715][ T5881] bridge0: port 1(bridge_slave_0) entered blocking state
[   50.522863][ T5881] bridge0: port 1(bridge_slave_0) entered forwarding state
[   50.540612][ T5881] 8021q: adding VLAN 0 to HW filter on device bond0
[   50.549623][   T31] bridge0: port 1(bridge_slave_0) entered disabled state
[   50.557084][   T31] bridge0: port 2(bridge_slave_1) entered disabled state
[   50.566000][ T5881] 8021q: adding VLAN 0 to HW filter on device team0
[   50.574224][   T74] bridge0: port 1(bridge_slave_0) entered blocking state
[   50.581282][   T74] bridge0: port 1(bridge_slave_0) entered forwarding state
[   50.589909][   T31] bridge0: port 2(bridge_slave_1) entered blocking state
[   50.596984][   T31] bridge0: port 2(bridge_slave_1) entered forwarding state
[   50.635045][ T5881] 8021q: adding VLAN 0 to HW filter on device batadv0
[   50.648984][ T5881] veth0_vlan: entered promiscuous mode
[   50.655799][ T5881] veth1_vlan: entered promiscuous mode
[   50.666178][ T5881] veth0_macvtap: entered promiscuous mode
[   50.672895][ T5881] veth1_macvtap: entered promiscuous mode
[   50.681496][ T5881] batman_adv: batadv0: Interface activated: batadv_slave_0
[   50.690818][ T5881] batman_adv: batadv0: Interface activated: batadv_slave_1
[   50.699598][   T74] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   50.708503][   T74] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   50.717969][   T74] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   50.727859][   T31] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   50.770674][   T31] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   50.781957][  T989] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   50.790035][  T989] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   50.800571][   T12] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   50.808621][   T12] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   50.816550][   T31] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   50.869426][   T31] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   50.899153][   T31] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
2025/11/14 15:28:29 executed programs: 0
[   53.832316][   T31] bridge_slave_1: left allmulticast mode
[   53.838115][   T31] bridge_slave_1: left promiscuous mode
[   53.843745][   T31] bridge0: port 2(bridge_slave_1) entered disabled state
[   53.851578][   T31] bridge_slave_0: left allmulticast mode
[   53.857222][   T31] bridge_slave_0: left promiscuous mode
[   53.862866][   T31] bridge0: port 1(bridge_slave_0) entered disabled state
[   53.918713][   T31] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   53.927986][   T31] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   53.936965][   T31] bond0 (unregistering): Released all slaves
[   53.989491][   T31] hsr_slave_0: left promiscuous mode
[   53.995049][   T31] hsr_slave_1: left promiscuous mode
[   54.000970][   T31] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   54.008418][   T31] batman_adv: batadv0: Removing interface: batadv_slave_0
[   54.015806][   T31] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   54.023374][   T31] batman_adv: batadv0: Removing interface: batadv_slave_1
[   54.031704][   T31] veth1_macvtap: left promiscuous mode
[   54.037164][   T31] veth0_macvtap: left promiscuous mode
[   54.042886][   T31] veth1_vlan: left promiscuous mode
[   54.048139][   T31] veth0_vlan: left promiscuous mode
[   54.071579][   T31] team0 (unregistering): Port device team_slave_1 removed
[   54.079731][   T31] team0 (unregistering): Port device team_slave_0 removed
[   56.471062][ T5135] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   56.478199][ T5135] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   56.485237][ T5135] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   56.492501][ T5135] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   56.499741][ T5135] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   56.533269][ T5987] chnl_net:caif_netlink_parms(): no params data found
[   56.551048][ T5987] bridge0: port 1(bridge_slave_0) entered blocking state
[   56.558200][ T5987] bridge0: port 1(bridge_slave_0) entered disabled state
[   56.565306][ T5987] bridge_slave_0: entered allmulticast mode
[   56.571616][ T5987] bridge_slave_0: entered promiscuous mode
[   56.578339][ T5987] bridge0: port 2(bridge_slave_1) entered blocking state
[   56.585394][ T5987] bridge0: port 2(bridge_slave_1) entered disabled state
[   56.592725][ T5987] bridge_slave_1: entered allmulticast mode
[   56.599055][ T5987] bridge_slave_1: entered promiscuous mode
[   56.609383][ T5987] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   56.619214][ T5987] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   56.633179][ T5987] team0: Port device team_slave_0 added
[   56.639450][ T5987] team0: Port device team_slave_1 added
[   56.649461][ T5987] batman_adv: batadv0: Adding interface: batadv_slave_0
[   56.656391][ T5987] 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.
[   56.682534][ T5987] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   56.693636][ T5987] batman_adv: batadv0: Adding interface: batadv_slave_1
[   56.700652][ T5987] 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.
[   56.726541][ T5987] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   56.742791][ T5987] hsr_slave_0: entered promiscuous mode
[   56.748575][ T5987] hsr_slave_1: entered promiscuous mode
[   56.899621][ T5987] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   56.907406][ T5987] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   56.916005][ T5987] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   56.923914][ T5987] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   56.936978][ T5987] bridge0: port 2(bridge_slave_1) entered blocking state
[   56.944085][ T5987] bridge0: port 2(bridge_slave_1) entered forwarding state
[   56.951366][ T5987] bridge0: port 1(bridge_slave_0) entered blocking state
[   56.958429][ T5987] bridge0: port 1(bridge_slave_0) entered forwarding state
[   56.978679][ T5987] 8021q: adding VLAN 0 to HW filter on device bond0
[   56.988116][   T31] bridge0: port 1(bridge_slave_0) entered disabled state
[   56.995621][   T31] bridge0: port 2(bridge_slave_1) entered disabled state
[   57.009787][ T5987] 8021q: adding VLAN 0 to HW filter on device team0
[   57.019929][   T31] bridge0: port 1(bridge_slave_0) entered blocking state
[   57.026986][   T31] bridge0: port 1(bridge_slave_0) entered forwarding state
[   57.035013][   T31] bridge0: port 2(bridge_slave_1) entered blocking state
[   57.042090][   T31] bridge0: port 2(bridge_slave_1) entered forwarding state
[   57.091660][ T5987] 8021q: adding VLAN 0 to HW filter on device batadv0
[   57.108045][ T5987] veth0_vlan: entered promiscuous mode
[   57.115202][ T5987] veth1_vlan: entered promiscuous mode
[   57.128314][ T5987] veth0_macvtap: entered promiscuous mode
[   57.135072][ T5987] veth1_macvtap: entered promiscuous mode
[   57.144855][ T5987] batman_adv: batadv0: Interface activated: batadv_slave_0
[   57.153327][ T5987] batman_adv: batadv0: Interface activated: batadv_slave_1
[   57.163642][   T74] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   57.175835][   T74] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   57.187129][   T74] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   57.200636][   T74] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   57.217417][   T12] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   57.227482][   T12] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   57.228996][   T74] wlan1: Created IBSS using preconfigured 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)
[   57.243335][   T74] 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-build3285272391=/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 4e1406b4d
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/ccvacM34.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:         6da43bbe Merge tag 'vfio-v6.18-rc6' of https://github...
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb128cd5cb439809
dashboard link: https://syzkaller.appspot.com/bug?extid=ad45f827c88778ff7df6
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=140237cd980000

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