Message-ID: <693abe36.050a0220.4004e.0339.GAE@google.com>
Date: Thu, 11 Dec 2025 04:51:02 -0800
From: syzbot <syzbot+2f8aa76e6acc9fce6638@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] memory leak in qgroup_reserve_data

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 '10.128.1.217' (ED25519) to the list of known hosts.
2025/12/11 12:50:04 parsed 1 programs
[   37.403916][ T5811] cgroup: Unknown subsys name 'net'
[   37.508618][ T5811] cgroup: Unknown subsys name 'cpuset'
[   37.515164][ T5811] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   45.595622][ T5811] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   46.835575][ T5819] 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.
[   46.879171][ T5133] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   46.886300][ T5133] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   46.898402][ T5133] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   46.905908][ T5133] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   46.913194][ T5133] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   47.260995][ T5860] chnl_net:caif_netlink_parms(): no params data found
[   47.281855][ T5860] bridge0: port 1(bridge_slave_0) entered blocking state
[   47.289221][ T5860] bridge0: port 1(bridge_slave_0) entered disabled state
[   47.296326][ T5860] bridge_slave_0: entered allmulticast mode
[   47.302712][ T5860] bridge_slave_0: entered promiscuous mode
[   47.309503][ T5860] bridge0: port 2(bridge_slave_1) entered blocking state
[   47.316605][ T5860] bridge0: port 2(bridge_slave_1) entered disabled state
[   47.323822][ T5860] bridge_slave_1: entered allmulticast mode
[   47.330120][ T5860] bridge_slave_1: entered promiscuous mode
[   47.342848][ T5860] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   47.353036][ T5860] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   47.366202][ T5860] team0: Port device team_slave_0 added
[   47.372310][ T5860] team0: Port device team_slave_1 added
[   47.382477][ T5860] batman_adv: batadv0: Adding interface: batadv_slave_0
[   47.389859][ T5860] 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.
[   47.416144][ T5860] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   47.427570][ T5860] batman_adv: batadv0: Adding interface: batadv_slave_1
[   47.434595][ T5860] 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.
[   47.461000][ T5860] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   47.481658][ T5860] hsr_slave_0: entered promiscuous mode
[   47.487615][ T5860] hsr_slave_1: entered promiscuous mode
[   47.517506][ T5860] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   47.525249][ T5860] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   47.532900][ T5860] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   47.540987][ T5860] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   47.553249][ T5860] bridge0: port 2(bridge_slave_1) entered blocking state
[   47.560530][ T5860] bridge0: port 2(bridge_slave_1) entered forwarding state
[   47.568122][ T5860] bridge0: port 1(bridge_slave_0) entered blocking state
[   47.575173][ T5860] bridge0: port 1(bridge_slave_0) entered forwarding state
[   47.592316][ T5860] 8021q: adding VLAN 0 to HW filter on device bond0
[   47.601689][   T58] bridge0: port 1(bridge_slave_0) entered disabled state
[   47.609495][   T58] bridge0: port 2(bridge_slave_1) entered disabled state
[   47.618901][ T5860] 8021q: adding VLAN 0 to HW filter on device team0
[   47.627093][   T12] bridge0: port 1(bridge_slave_0) entered blocking state
[   47.634273][   T12] bridge0: port 1(bridge_slave_0) entered forwarding state
[   47.643403][   T58] bridge0: port 2(bridge_slave_1) entered blocking state
[   47.650641][   T58] bridge0: port 2(bridge_slave_1) entered forwarding state
[   47.690680][ T5860] 8021q: adding VLAN 0 to HW filter on device batadv0
[   47.704885][ T5860] veth0_vlan: entered promiscuous mode
[   47.712118][ T5860] veth1_vlan: entered promiscuous mode
[   47.722814][ T5860] veth0_macvtap: entered promiscuous mode
[   47.729850][ T5860] veth1_macvtap: entered promiscuous mode
[   47.739453][ T5860] batman_adv: batadv0: Interface activated: batadv_slave_0
[   47.748702][ T5860] batman_adv: batadv0: Interface activated: batadv_slave_1
[   47.758196][   T12] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   47.767254][   T12] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   47.776557][   T12] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   47.786234][   T12] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   47.841159][ T1034] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   47.859488][ T1034] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   47.909405][ T1034] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   47.968913][ T1034] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   48.000939][   T58] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   48.010765][   T58] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   48.021322][   T12] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   48.029314][   T12] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
2025/12/11 12:50:16 executed programs: 0
[   50.840038][ T1034] bridge_slave_1: left allmulticast mode
[   50.846601][ T1034] bridge_slave_1: left promiscuous mode
[   50.852256][ T1034] bridge0: port 2(bridge_slave_1) entered disabled state
[   50.860075][ T1034] bridge_slave_0: left allmulticast mode
[   50.865706][ T1034] bridge_slave_0: left promiscuous mode
[   50.871491][ T1034] bridge0: port 1(bridge_slave_0) entered disabled state
[   50.919030][ T1034] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   50.928706][ T1034] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   50.937917][ T1034] bond0 (unregistering): Released all slaves
[   51.019077][ T1034] hsr_slave_0: left promiscuous mode
[   51.024910][ T1034] hsr_slave_1: left promiscuous mode
[   51.031138][ T1034] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   51.038891][ T1034] batman_adv: batadv0: Removing interface: batadv_slave_0
[   51.046673][ T1034] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   51.054623][ T1034] batman_adv: batadv0: Removing interface: batadv_slave_1
[   51.063401][ T1034] veth1_macvtap: left promiscuous mode
[   51.069252][ T1034] veth0_macvtap: left promiscuous mode
[   51.074835][ T1034] veth1_vlan: left promiscuous mode
[   51.080516][ T1034] veth0_vlan: left promiscuous mode
[   51.111321][ T1034] team0 (unregistering): Port device team_slave_1 removed
[   51.119654][ T1034] team0 (unregistering): Port device team_slave_0 removed
[   53.595513][   T51] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   53.602664][   T51] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   53.609917][   T51] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   53.617376][   T51] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   53.625082][   T51] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   53.658839][ T5986] chnl_net:caif_netlink_parms(): no params data found
[   53.677076][ T5986] bridge0: port 1(bridge_slave_0) entered blocking state
[   53.684290][ T5986] bridge0: port 1(bridge_slave_0) entered disabled state
[   53.691756][ T5986] bridge_slave_0: entered allmulticast mode
[   53.698037][ T5986] bridge_slave_0: entered promiscuous mode
[   53.704616][ T5986] bridge0: port 2(bridge_slave_1) entered blocking state
[   53.711841][ T5986] bridge0: port 2(bridge_slave_1) entered disabled state
[   53.719054][ T5986] bridge_slave_1: entered allmulticast mode
[   53.725237][ T5986] bridge_slave_1: entered promiscuous mode
[   53.735598][ T5986] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   53.745356][ T5986] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   53.759567][ T5986] team0: Port device team_slave_0 added
[   53.765789][ T5986] team0: Port device team_slave_1 added
[   53.775976][ T5986] batman_adv: batadv0: Adding interface: batadv_slave_0
[   53.783114][ 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.
[   53.809753][ T5986] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   53.821002][ T5986] batman_adv: batadv0: Adding interface: batadv_slave_1
[   53.828044][ 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.
[   53.854377][ T5986] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   53.871243][ T5986] hsr_slave_0: entered promiscuous mode
[   53.877038][ T5986] hsr_slave_1: entered promiscuous mode
[   54.068255][ T5986] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   54.077708][ T5986] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   54.085441][ T5986] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   54.093888][ T5986] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   54.113170][ T5986] bridge0: port 2(bridge_slave_1) entered blocking state
[   54.120735][ T5986] bridge0: port 2(bridge_slave_1) entered forwarding state
[   54.128469][ T5986] bridge0: port 1(bridge_slave_0) entered blocking state
[   54.135750][ T5986] bridge0: port 1(bridge_slave_0) entered forwarding state
[   54.157830][ T5986] 8021q: adding VLAN 0 to HW filter on device bond0
[   54.167464][   T12] bridge0: port 1(bridge_slave_0) entered disabled state
[   54.175477][   T12] bridge0: port 2(bridge_slave_1) entered disabled state
[   54.186223][ T5986] 8021q: adding VLAN 0 to HW filter on device team0
[   54.195056][ T1034] bridge0: port 1(bridge_slave_0) entered blocking state
[   54.202328][ T1034] bridge0: port 1(bridge_slave_0) entered forwarding state
[   54.212042][ T1034] bridge0: port 2(bridge_slave_1) entered blocking state
[   54.219319][ T1034] bridge0: port 2(bridge_slave_1) entered forwarding state
[   54.273088][ T5986] 8021q: adding VLAN 0 to HW filter on device batadv0
[   54.290440][ T5986] veth0_vlan: entered promiscuous mode
[   54.299332][ T5986] veth1_vlan: entered promiscuous mode
[   54.311769][ T5986] veth0_macvtap: entered promiscuous mode
[   54.319507][ T5986] veth1_macvtap: entered promiscuous mode
[   54.330377][ T5986] batman_adv: batadv0: Interface activated: batadv_slave_0
[   54.340331][ T5986] batman_adv: batadv0: Interface activated: batadv_slave_1
[   54.355244][ T1034] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   54.364345][ T1034] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   54.373731][ T1034] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   54.384097][ T1034] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   54.413748][ T1034] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
SYZFAIL: failed to recv rpc
[   54.425026][ T1034] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   54.436532][ T1034] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   54.445879][ T1034] 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-build1096256202=/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/ccIdn9ML.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:         d358e525 Merge tag 'for-6.19/dm-changes' of git://git...
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=9a0268003e02068d
dashboard link: https://syzkaller.appspot.com/bug?extid=2f8aa76e6acc9fce6638
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=1140261a580000

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