Message-ID: <6916ab24.050a0220.3565dc.0039.GAE@google.com>
Date: Thu, 13 Nov 2025 20:08:04 -0800
From: syzbot <syzbot+9c47ad18f978d4394986@...kaller.appspotmail.com>
To: eslam.medhat1993@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] memory leak in do_timer_create

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


Warning: Permanently added '10.128.0.161' (ED25519) to the list of known hosts.
2025/11/14 04:06:56 parsed 1 programs
[   44.794762][ T5813] cgroup: Unknown subsys name 'net'
[   44.916181][ T5813] cgroup: Unknown subsys name 'cpuset'
[   44.923078][ T5813] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   53.639357][ T5813] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   55.177789][ T5824] 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.
[   55.235590][ T5830] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   55.243035][ T5830] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   55.250812][ T5830] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   55.258701][ T5830] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   55.266968][ T5830] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   55.703638][  T799] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   55.712021][  T799] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   55.723063][ T3505] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   55.731244][ T3505] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   55.862606][ T5886] chnl_net:caif_netlink_parms(): no params data found
[   55.884445][ T5886] bridge0: port 1(bridge_slave_0) entered blocking state
[   55.891932][ T5886] bridge0: port 1(bridge_slave_0) entered disabled state
[   55.899980][ T5886] bridge_slave_0: entered allmulticast mode
[   55.907339][ T5886] bridge_slave_0: entered promiscuous mode
[   55.913841][ T5886] bridge0: port 2(bridge_slave_1) entered blocking state
[   55.921571][ T5886] bridge0: port 2(bridge_slave_1) entered disabled state
[   55.929497][ T5886] bridge_slave_1: entered allmulticast mode
[   55.935959][ T5886] bridge_slave_1: entered promiscuous mode
[   55.948855][ T5886] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   55.958993][ T5886] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   55.972977][ T5886] team0: Port device team_slave_0 added
[   55.979392][ T5886] team0: Port device team_slave_1 added
[   55.992814][ T5886] batman_adv: batadv0: Adding interface: batadv_slave_0
[   56.000997][ T5886] 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.
[   56.028043][ T5886] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   56.039720][ T5886] batman_adv: batadv0: Adding interface: batadv_slave_1
[   56.046966][ T5886] 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.
[   56.073435][ T5886] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   56.094211][ T5886] hsr_slave_0: entered promiscuous mode
[   56.100458][ T5886] hsr_slave_1: entered promiscuous mode
[   56.138732][ T5886] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   56.147296][ T5886] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   56.155698][ T5886] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   56.164728][ T5886] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   56.182358][ T5886] bridge0: port 2(bridge_slave_1) entered blocking state
[   56.189842][ T5886] bridge0: port 2(bridge_slave_1) entered forwarding state
[   56.197265][ T5886] bridge0: port 1(bridge_slave_0) entered blocking state
[   56.204609][ T5886] bridge0: port 1(bridge_slave_0) entered forwarding state
[   56.224823][ T5886] 8021q: adding VLAN 0 to HW filter on device bond0
[   56.234962][  T799] bridge0: port 1(bridge_slave_0) entered disabled state
[   56.242843][  T799] bridge0: port 2(bridge_slave_1) entered disabled state
[   56.253310][ T5886] 8021q: adding VLAN 0 to HW filter on device team0
[   56.262879][ T4088] bridge0: port 1(bridge_slave_0) entered blocking state
[   56.270547][ T4088] bridge0: port 1(bridge_slave_0) entered forwarding state
[   56.280312][  T799] bridge0: port 2(bridge_slave_1) entered blocking state
[   56.288611][  T799] bridge0: port 2(bridge_slave_1) entered forwarding state
[   56.349969][ T5886] 8021q: adding VLAN 0 to HW filter on device batadv0
[   56.369518][ T5886] veth0_vlan: entered promiscuous mode
[   56.378056][ T5886] veth1_vlan: entered promiscuous mode
[   56.391688][ T5886] veth0_macvtap: entered promiscuous mode
[   56.399665][ T5886] veth1_macvtap: entered promiscuous mode
[   56.409561][ T5886] batman_adv: batadv0: Interface activated: batadv_slave_0
[   56.419564][ T5886] batman_adv: batadv0: Interface activated: batadv_slave_1
[   56.429430][ T4088] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   56.438542][ T4088] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   56.448810][ T4088] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   56.458768][ T4088] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   56.508005][ T3505] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   56.566660][ T3505] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   56.626800][ T3505] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   56.661754][ T3505] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
2025/11/14 04:07:11 executed programs: 0
[   59.609579][ T3505] bridge_slave_1: left allmulticast mode
[   59.615426][ T3505] bridge_slave_1: left promiscuous mode
[   59.621249][ T3505] bridge0: port 2(bridge_slave_1) entered disabled state
[   59.629795][ T3505] bridge_slave_0: left allmulticast mode
[   59.635793][ T3505] bridge_slave_0: left promiscuous mode
[   59.641606][ T3505] bridge0: port 1(bridge_slave_0) entered disabled state
[   59.686984][ T3505] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   59.696872][ T3505] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   59.706397][ T3505] bond0 (unregistering): Released all slaves
[   59.766608][ T3505] hsr_slave_0: left promiscuous mode
[   59.772314][ T3505] hsr_slave_1: left promiscuous mode
[   59.778134][ T3505] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   59.785926][ T3505] batman_adv: batadv0: Removing interface: batadv_slave_0
[   59.793421][ T3505] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   59.800982][ T3505] batman_adv: batadv0: Removing interface: batadv_slave_1
[   59.809400][ T3505] veth1_macvtap: left promiscuous mode
[   59.815590][ T3505] veth0_macvtap: left promiscuous mode
[   59.821279][ T3505] veth1_vlan: left promiscuous mode
[   59.827043][ T3505] veth0_vlan: left promiscuous mode
[   59.854694][ T3505] team0 (unregistering): Port device team_slave_1 removed
[   59.864443][ T3505] team0 (unregistering): Port device team_slave_0 removed
[   62.773039][ T5134] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   62.780656][ T5134] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   62.788115][ T5134] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   62.795522][ T5134] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   62.802757][ T5134] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   62.843777][ T5986] chnl_net:caif_netlink_parms(): no params data found
[   62.865722][ T5986] bridge0: port 1(bridge_slave_0) entered blocking state
[   62.873096][ T5986] bridge0: port 1(bridge_slave_0) entered disabled state
[   62.880487][ T5986] bridge_slave_0: entered allmulticast mode
[   62.886927][ T5986] bridge_slave_0: entered promiscuous mode
[   62.894424][ T5986] bridge0: port 2(bridge_slave_1) entered blocking state
[   62.901897][ T5986] bridge0: port 2(bridge_slave_1) entered disabled state
[   62.909417][ T5986] bridge_slave_1: entered allmulticast mode
[   62.915886][ T5986] bridge_slave_1: entered promiscuous mode
[   62.929191][ T5986] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   62.939350][ T5986] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   62.953231][ T5986] team0: Port device team_slave_0 added
[   62.959588][ T5986] team0: Port device team_slave_1 added
[   62.970025][ T5986] batman_adv: batadv0: Adding interface: batadv_slave_0
[   62.977198][ T5986] 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.
[   63.004432][ T5986] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   63.016146][ T5986] batman_adv: batadv0: Adding interface: batadv_slave_1
[   63.023370][ T5986] 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.
[   63.050199][ T5986] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   63.068827][ T5986] hsr_slave_0: entered promiscuous mode
[   63.074768][ T5986] hsr_slave_1: entered promiscuous mode
[   63.270626][ T5986] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   63.279475][ T5986] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   63.287689][ T5986] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   63.296051][ T5986] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   63.309900][ T5986] bridge0: port 2(bridge_slave_1) entered blocking state
[   63.317471][ T5986] bridge0: port 2(bridge_slave_1) entered forwarding state
[   63.324775][ T5986] bridge0: port 1(bridge_slave_0) entered blocking state
[   63.332055][ T5986] bridge0: port 1(bridge_slave_0) entered forwarding state
[   63.356494][ T5986] 8021q: adding VLAN 0 to HW filter on device bond0
[   63.366968][   T12] bridge0: port 1(bridge_slave_0) entered disabled state
[   63.374534][   T12] bridge0: port 2(bridge_slave_1) entered disabled state
[   63.385713][ T5986] 8021q: adding VLAN 0 to HW filter on device team0
[   63.395204][   T12] bridge0: port 1(bridge_slave_0) entered blocking state
[   63.402380][   T12] bridge0: port 1(bridge_slave_0) entered forwarding state
[   63.413862][ T3505] bridge0: port 2(bridge_slave_1) entered blocking state
[   63.421039][ T3505] bridge0: port 2(bridge_slave_1) entered forwarding state
[   63.480639][ T5986] 8021q: adding VLAN 0 to HW filter on device batadv0
[   63.499969][ T5986] veth0_vlan: entered promiscuous mode
[   63.507992][ T5986] veth1_vlan: entered promiscuous mode
[   63.521865][ T5986] veth0_macvtap: entered promiscuous mode
[   63.529847][ T5986] veth1_macvtap: entered promiscuous mode
[   63.540597][ T5986] batman_adv: batadv0: Interface activated: batadv_slave_0
[   63.550698][ T5986] batman_adv: batadv0: Interface activated: batadv_slave_1
[   63.560492][ T3505] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   63.577114][ T3505] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   63.593044][ T3505] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   63.606395][ T3505] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   63.615277][ T3505] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   63.623464][ T3505] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
SYZFAIL: failed to recv rpc
[   63.637976][   T12] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   63.646104][   T12] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
fd=3 want=4 recv=0 n=0


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-build3477257999=/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 4e1406b4def
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/ccvZzLPE.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=9c47ad18f978d4394986
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=14d69c12580000

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