Message-ID: <692e01d3.a70a0220.2ea503.00ba.GAE@google.com>
Date: Mon, 01 Dec 2025 13:00:03 -0800
From: syzbot <syzbot+641eec6b7af1f62f2b99@...kaller.appspotmail.com>
To: axboe@...nel.dk, io-uring@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] memory leak in io_submit_sqes (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 '10.128.1.13' (ED25519) to the list of known hosts.
2025/12/01 20:59:35 parsed 1 programs
[   45.094356][ T5813] cgroup: Unknown subsys name 'net'
[   45.202443][ T5813] cgroup: Unknown subsys name 'cpuset'
[   45.208862][ T5813] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   53.863046][ T5813] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   55.317007][ 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.
[   55.448849][ T5830] chnl_net:caif_netlink_parms(): no params data found
[   55.468796][ T5830] bridge0: port 1(bridge_slave_0) entered blocking state
[   55.476764][ T5830] bridge0: port 1(bridge_slave_0) entered disabled state
[   55.484104][ T5830] bridge_slave_0: entered allmulticast mode
[   55.490494][ T5830] bridge_slave_0: entered promiscuous mode
[   55.497389][ T5830] bridge0: port 2(bridge_slave_1) entered blocking state
[   55.504651][ T5830] bridge0: port 2(bridge_slave_1) entered disabled state
[   55.511920][ T5830] bridge_slave_1: entered allmulticast mode
[   55.518298][ T5830] bridge_slave_1: entered promiscuous mode
[   55.530562][ T5830] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   55.540621][ T5830] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   55.555225][ T5830] team0: Port device team_slave_0 added
[   55.561419][ T5830] team0: Port device team_slave_1 added
[   55.571641][ T5830] batman_adv: batadv0: Adding interface: batadv_slave_0
[   55.578610][ T5830] 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.
[   55.604931][ T5830] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   55.616342][ T5830] batman_adv: batadv0: Adding interface: batadv_slave_1
[   55.623586][ T5830] 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.
[   55.649758][ T5830] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   55.667015][ T5830] hsr_slave_0: entered promiscuous mode
[   55.672837][ T5830] hsr_slave_1: entered promiscuous mode
[   55.702718][ T5830] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   55.710523][ T5830] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   55.718180][ T5830] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   55.726058][ T5830] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   55.738320][ T5830] bridge0: port 2(bridge_slave_1) entered blocking state
[   55.745549][ T5830] bridge0: port 2(bridge_slave_1) entered forwarding state
[   55.752892][ T5830] bridge0: port 1(bridge_slave_0) entered blocking state
[   55.759930][ T5830] bridge0: port 1(bridge_slave_0) entered forwarding state
[   55.777110][ T5830] 8021q: adding VLAN 0 to HW filter on device bond0
[   55.786285][   T12] bridge0: port 1(bridge_slave_0) entered disabled state
[   55.793904][   T12] bridge0: port 2(bridge_slave_1) entered disabled state
[   55.803960][ T5830] 8021q: adding VLAN 0 to HW filter on device team0
[   55.812453][   T59] bridge0: port 1(bridge_slave_0) entered blocking state
[   55.819693][   T59] bridge0: port 1(bridge_slave_0) entered forwarding state
[   55.831755][   T59] bridge0: port 2(bridge_slave_1) entered blocking state
[   55.838825][   T59] bridge0: port 2(bridge_slave_1) entered forwarding state
[   55.879152][ T5830] 8021q: adding VLAN 0 to HW filter on device batadv0
[   55.894511][ T5830] veth0_vlan: entered promiscuous mode
[   55.901971][ T5830] veth1_vlan: entered promiscuous mode
[   55.913067][ T5830] veth0_macvtap: entered promiscuous mode
[   55.919675][ T5830] veth1_macvtap: entered promiscuous mode
[   55.928894][ T5830] batman_adv: batadv0: Interface activated: batadv_slave_0
[   55.938300][ T5830] batman_adv: batadv0: Interface activated: batadv_slave_1
[   55.947580][   T12] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   55.956434][   T12] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   55.965897][   T12] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   55.974873][   T12] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   56.025363][   T58] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   56.088083][   T58] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   56.134632][   T58] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   56.183062][   T58] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   56.198760][   T12] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   56.207701][   T12] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   56.218293][   T12] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   56.226287][   T12] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   56.343504][ T5892] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   56.350743][ T5892] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   56.358165][ T5892] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   56.365814][ T5892] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   56.373433][ T5892] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
2025/12/01 20:59:49 executed programs: 0
[   59.121698][   T58] bridge_slave_1: left allmulticast mode
[   59.127497][   T58] bridge_slave_1: left promiscuous mode
[   59.134848][   T58] bridge0: port 2(bridge_slave_1) entered disabled state
[   59.142486][   T58] bridge_slave_0: left allmulticast mode
[   59.148220][   T58] bridge_slave_0: left promiscuous mode
[   59.154181][   T58] bridge0: port 1(bridge_slave_0) entered disabled state
[   59.203736][   T58] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   59.213014][   T58] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   59.222011][   T58] bond0 (unregistering): Released all slaves
[   59.313631][   T58] hsr_slave_0: left promiscuous mode
[   59.319216][   T58] hsr_slave_1: left promiscuous mode
[   59.324844][   T58] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   59.332334][   T58] batman_adv: batadv0: Removing interface: batadv_slave_0
[   59.339764][   T58] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   59.347198][   T58] batman_adv: batadv0: Removing interface: batadv_slave_1
[   59.355640][   T58] veth1_macvtap: left promiscuous mode
[   59.361130][   T58] veth0_macvtap: left promiscuous mode
[   59.366742][   T58] veth1_vlan: left promiscuous mode
[   59.372040][   T58] veth0_vlan: left promiscuous mode
[   59.399875][   T58] team0 (unregistering): Port device team_slave_1 removed
[   59.408653][   T58] team0 (unregistering): Port device team_slave_0 removed
[   62.564840][ T5134] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   62.572035][ T5134] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   62.579170][ T5134] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   62.586644][ T5134] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   62.594085][ T5134] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   62.632210][ T5983] chnl_net:caif_netlink_parms(): no params data found
[   62.651514][ T5983] bridge0: port 1(bridge_slave_0) entered blocking state
[   62.658706][ T5983] bridge0: port 1(bridge_slave_0) entered disabled state
[   62.666137][ T5983] bridge_slave_0: entered allmulticast mode
[   62.672389][ T5983] bridge_slave_0: entered promiscuous mode
[   62.678796][ T5983] bridge0: port 2(bridge_slave_1) entered blocking state
[   62.686192][ T5983] bridge0: port 2(bridge_slave_1) entered disabled state
[   62.693313][ T5983] bridge_slave_1: entered allmulticast mode
[   62.699554][ T5983] bridge_slave_1: entered promiscuous mode
[   62.711639][ T5983] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   62.721580][ T5983] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   62.735611][ T5983] team0: Port device team_slave_0 added
[   62.742046][ T5983] team0: Port device team_slave_1 added
[   62.752167][ T5983] batman_adv: batadv0: Adding interface: batadv_slave_0
[   62.759107][ T5983] 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.
[   62.785244][ T5983] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   62.796357][ T5983] batman_adv: batadv0: Adding interface: batadv_slave_1
[   62.803353][ T5983] 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.
[   62.829487][ T5983] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   62.847117][ T5983] hsr_slave_0: entered promiscuous mode
[   62.852936][ T5983] hsr_slave_1: entered promiscuous mode
[   63.036253][ T5983] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   63.045375][ T5983] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   63.053519][ T5983] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   63.061789][ T5983] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   63.075975][ T5983] bridge0: port 2(bridge_slave_1) entered blocking state
[   63.083083][ T5983] bridge0: port 2(bridge_slave_1) entered forwarding state
[   63.090673][ T5983] bridge0: port 1(bridge_slave_0) entered blocking state
[   63.097877][ T5983] bridge0: port 1(bridge_slave_0) entered forwarding state
[   63.122294][ T5983] 8021q: adding VLAN 0 to HW filter on device bond0
[   63.132914][   T58] bridge0: port 1(bridge_slave_0) entered disabled state
[   63.140548][   T58] bridge0: port 2(bridge_slave_1) entered disabled state
[   63.152272][ T5983] 8021q: adding VLAN 0 to HW filter on device team0
[   63.162216][   T79] bridge0: port 1(bridge_slave_0) entered blocking state
[   63.169296][   T79] bridge0: port 1(bridge_slave_0) entered forwarding state
[   63.178607][   T58] bridge0: port 2(bridge_slave_1) entered blocking state
[   63.185727][   T58] bridge0: port 2(bridge_slave_1) entered forwarding state
[   63.247759][ T5983] 8021q: adding VLAN 0 to HW filter on device batadv0
[   63.268232][ T5983] veth0_vlan: entered promiscuous mode
[   63.276325][ T5983] veth1_vlan: entered promiscuous mode
[   63.296850][ T5983] veth0_macvtap: entered promiscuous mode
[   63.304290][ T5983] veth1_macvtap: entered promiscuous mode
[   63.314925][ T5983] batman_adv: batadv0: Interface activated: batadv_slave_0
[   63.334416][ T5983] batman_adv: batadv0: Interface activated: batadv_slave_1
[   63.344953][   T12] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   63.354046][   T79] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   63.363838][   T79] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   63.383838][   T79] netdevsim netdevsim0 netdevsim3: set [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)
[   63.428886][   T79] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   63.440292][   T79] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   63.451963][   T12] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   63.463029][   T12] 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-build1359059719=/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/ccZ4MFua.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:         7d0a66e4 Linux 6.18
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v6.18
kernel config:  https://syzkaller.appspot.com/x/.config?x=f30cc590c4f6da44
dashboard link: https://syzkaller.appspot.com/bug?extid=641eec6b7af1f62f2b99
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=13688512580000

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