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Message-ID: <6961c30a.050a0220.318c5c.0163.GAE@google.com>
Date: Fri, 09 Jan 2026 19:10:02 -0800
From: syzbot <syzbot+d97580a8cceb9b03c13e@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] [cgroups?] kernel BUG in swap_cgroup_record (2)
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 '10.128.0.242' (ED25519) to the list of known hosts.
2026/01/10 03:09:35 parsed 1 programs
[ 88.711272][ T5822] cgroup: Unknown subsys name 'net'
[ 88.843176][ T5822] cgroup: Unknown subsys name 'cpuset'
[ 88.852142][ T5822] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[ 90.461442][ T5822] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k
[ 91.871113][ T24] cfg80211: failed to load regulatory.db
[ 93.600337][ T5836] 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.
[ 95.440430][ T5868] chnl_net:caif_netlink_parms(): no params data found
[ 95.527893][ T5868] bridge0: port 1(bridge_slave_0) entered blocking state
[ 95.535931][ T5868] bridge0: port 1(bridge_slave_0) entered disabled state
[ 95.543456][ T5868] bridge_slave_0: entered allmulticast mode
[ 95.550859][ T5868] bridge_slave_0: entered promiscuous mode
[ 95.563396][ T5868] bridge0: port 2(bridge_slave_1) entered blocking state
[ 95.570815][ T5868] bridge0: port 2(bridge_slave_1) entered disabled state
[ 95.578026][ T5868] bridge_slave_1: entered allmulticast mode
[ 95.586755][ T5868] bridge_slave_1: entered promiscuous mode
[ 95.626344][ T5868] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 95.638893][ T5868] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 95.673144][ T5868] team0: Port device team_slave_0 added
[ 95.681936][ T5868] team0: Port device team_slave_1 added
[ 95.708970][ T5868] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 95.716159][ T5868] 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.
[ 95.742335][ T5868] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 95.755810][ T5868] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 95.762876][ T5868] 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.
[ 95.791065][ T5868] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 95.834850][ T5868] hsr_slave_0: entered promiscuous mode
[ 95.841687][ T5868] hsr_slave_1: entered promiscuous mode
[ 96.001076][ T5868] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 96.014149][ T5868] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 96.025138][ T5868] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 96.035535][ T5868] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 96.066548][ T5868] bridge0: port 2(bridge_slave_1) entered blocking state
[ 96.073872][ T5868] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 96.128341][ T5868] 8021q: adding VLAN 0 to HW filter on device bond0
[ 96.146621][ T59] bridge0: port 2(bridge_slave_1) entered disabled state
[ 96.167349][ T5868] 8021q: adding VLAN 0 to HW filter on device team0
[ 96.181939][ T270] bridge0: port 1(bridge_slave_0) entered blocking state
[ 96.189056][ T270] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 96.203674][ T270] bridge0: port 2(bridge_slave_1) entered blocking state
[ 96.210860][ T270] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 96.381576][ T5868] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 96.428743][ T5868] veth0_vlan: entered promiscuous mode
[ 96.439922][ T5868] veth1_vlan: entered promiscuous mode
[ 96.471394][ T5868] veth0_macvtap: entered promiscuous mode
[ 96.481411][ T5868] veth1_macvtap: entered promiscuous mode
[ 96.502984][ T5868] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 96.524832][ T5868] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 96.540909][ T59] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 96.551008][ T59] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 96.560641][ T59] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 96.571492][ T59] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 96.743657][ T12] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 96.832582][ T12] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 96.896908][ T12] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 97.033956][ T12] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 97.365778][ T59] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 97.381230][ T59] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 97.411764][ T1139] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 97.421103][ T1139] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 97.695376][ T5912] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 97.703571][ T5912] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[ 97.713201][ T5912] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[ 97.722480][ T5912] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[ 97.730298][ T5912] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
2026/01/10 03:09:48 executed programs: 0
[ 98.868274][ T5912] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 98.877916][ T5912] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[ 98.887261][ T5912] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[ 98.895276][ T5912] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[ 98.903259][ T5912] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[ 99.060866][ T5932] chnl_net:caif_netlink_parms(): no params data found
[ 99.138845][ T5932] bridge0: port 1(bridge_slave_0) entered blocking state
[ 99.147157][ T5932] bridge0: port 1(bridge_slave_0) entered disabled state
[ 99.154595][ T5932] bridge_slave_0: entered allmulticast mode
[ 99.161781][ T5932] bridge_slave_0: entered promiscuous mode
[ 99.169948][ T5932] bridge0: port 2(bridge_slave_1) entered blocking state
[ 99.177093][ T5932] bridge0: port 2(bridge_slave_1) entered disabled state
[ 99.185026][ T5932] bridge_slave_1: entered allmulticast mode
[ 99.192340][ T5932] bridge_slave_1: entered promiscuous mode
[ 99.225243][ T5932] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 99.237126][ T5932] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 99.270116][ T5932] team0: Port device team_slave_0 added
[ 99.278386][ T5932] team0: Port device team_slave_1 added
[ 99.306257][ T5932] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 99.314231][ T5932] 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.
[ 99.340169][ T5932] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 99.352165][ T5932] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 99.359289][ T5932] 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.
[ 99.385220][ T5932] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 99.430574][ T5932] hsr_slave_0: entered promiscuous mode
[ 99.439595][ T5932] hsr_slave_1: entered promiscuous mode
[ 99.445741][ T5932] debugfs: 'hsr0' already exists in 'hsr'
[ 99.452235][ T5932] Cannot create hsr debugfs directory
[ 99.622568][ T12] bridge_slave_1: left allmulticast mode
[ 99.629935][ T12] bridge_slave_1: left promiscuous mode
[ 99.636169][ T12] bridge0: port 2(bridge_slave_1) entered disabled state
[ 99.651867][ T12] bridge_slave_0: left allmulticast mode
[ 99.657517][ T12] bridge_slave_0: left promiscuous mode
[ 99.664260][ T12] bridge0: port 1(bridge_slave_0) entered disabled state
[ 99.883035][ T12] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[ 99.894158][ T12] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[ 99.904243][ T12] bond0 (unregistering): Released all slaves
[ 100.011269][ T12] hsr_slave_0: left promiscuous mode
[ 100.019048][ T12] hsr_slave_1: left promiscuous mode
[ 100.028507][ T12] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[ 100.037408][ T12] batman_adv: batadv0: Removing interface: batadv_slave_0
[ 100.047364][ T12] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[ 100.055101][ T12] batman_adv: batadv0: Removing interface: batadv_slave_1
[ 100.077283][ T12] veth1_macvtap: left promiscuous mode
[ 100.087766][ T12] veth0_macvtap: left promiscuous mode
[ 100.094117][ T12] veth1_vlan: left promiscuous mode
[ 100.099830][ T12] veth0_vlan: left promiscuous mode
[ 100.587324][ T12] team0 (unregistering): Port device team_slave_1 removed
[ 100.613018][ T12] team0 (unregistering): Port device team_slave_0 removed
[ 100.990032][ T5141] Bluetooth: hci0: command tx timeout
[ 101.261953][ T5932] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 101.283832][ T5932] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 101.296306][ T5932] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 101.317158][ T5932] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 101.896074][ T5932] 8021q: adding VLAN 0 to HW filter on device bond0
[ 101.961367][ T5932] 8021q: adding VLAN 0 to HW filter on device team0
[ 102.024829][ T1139] bridge0: port 1(bridge_slave_0) entered blocking state
[ 102.032094][ T1139] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 102.136814][ T1139] bridge0: port 2(bridge_slave_1) entered blocking state
[ 102.144085][ T1139] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 102.627847][ T5932] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 102.726619][ T5932] veth0_vlan: entered promiscuous mode
[ 102.750192][ T5932] veth1_vlan: entered promiscuous mode
[ 102.799601][ T5932] veth0_macvtap: entered promiscuous mode
[ 102.811637][ T5932] veth1_macvtap: entered promiscuous mode
[ 102.840912][ T5932] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 102.870006][ T5932] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 102.902211][ T12] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 102.922171][ T12] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 102.935105][ T12] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 102.958747][ T12] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 103.045786][ T12] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 103.059702][ T12] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 103.069711][ T5141] Bluetooth: hci0: command tx timeout
[ 103.115541][ T270] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 103.125601][ T270] wlan1: 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)
[ 103.767902][ T1139] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 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-build2111104491=/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/ccTDVhZE.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: f417b7ff Add linux-next specific files for 20260109
git tree: linux-next
kernel config: https://syzkaller.appspot.com/x/.config?x=9abcd50d16f3c8b5
dashboard link: https://syzkaller.appspot.com/bug?extid=d97580a8cceb9b03c13e
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=1786619a580000
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