Message-ID: <69743487.050a0220.226181.0000.GAE@google.com>
Date: Fri, 23 Jan 2026 18:55:03 -0800
From: syzbot <syzbot+44c564a3cb08605f34a1@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_block_group_search

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

52] bridge_slave_1: entered promiscuous mode
[   99.924823][ T5352] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   99.942796][ T5352] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   99.987553][ T5352] team0: Port device team_slave_0 added
[  100.002650][ T5352] team0: Port device team_slave_1 added
[  100.050188][ T5352] batman_adv: batadv0: Adding interface: batadv_slave_0
[  100.053215][ T5352] 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.
[  100.079713][ T5352] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[  100.090878][ T5352] batman_adv: batadv0: Adding interface: batadv_slave_1
[  100.093661][ T5352] 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.
[  100.120380][ T5352] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[  100.203017][ T5352] hsr_slave_0: entered promiscuous mode
[  100.210984][ T5352] hsr_slave_1: entered promiscuous mode
[  100.521864][ T5352] netdevsim netdevsim0 netdevsim0: renamed from eth0
[  100.546330][ T5352] netdevsim netdevsim0 netdevsim1: renamed from eth1
[  100.571779][ T5352] netdevsim netdevsim0 netdevsim2: renamed from eth2
[  100.581855][ T5352] netdevsim netdevsim0 netdevsim3: renamed from eth3
[  100.734823][ T5352] 8021q: adding VLAN 0 to HW filter on device bond0
[  100.763943][ T5352] 8021q: adding VLAN 0 to HW filter on device team0
[  100.805841][  T121] bridge0: port 1(bridge_slave_0) entered blocking state
[  100.809232][  T121] bridge0: port 1(bridge_slave_0) entered forwarding state
[  100.822078][  T121] bridge0: port 2(bridge_slave_1) entered blocking state
[  100.825102][  T121] bridge0: port 2(bridge_slave_1) entered forwarding state
[  101.153484][ T5352] 8021q: adding VLAN 0 to HW filter on device batadv0
[  101.223844][ T5352] veth0_vlan: entered promiscuous mode
[  101.245023][ T5352] veth1_vlan: entered promiscuous mode
[  101.287928][ T5352] veth0_macvtap: entered promiscuous mode
[  101.303761][ T5352] veth1_macvtap: entered promiscuous mode
[  101.331823][ T5352] batman_adv: batadv0: Interface activated: batadv_slave_0
[  101.351697][ T5352] batman_adv: batadv0: Interface activated: batadv_slave_1
[  101.377023][  T121] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[  101.390987][  T121] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[  101.400379][  T121] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[  101.404248][  T121] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[  101.693061][ T3176] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  101.852861][ T3176] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  101.961651][ T3176] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  102.042799][ T3176] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  103.992351][ T3176] bridge_slave_1: left allmulticast mode
[  103.995078][ T3176] bridge_slave_1: left promiscuous mode
[  103.998167][ T3176] bridge0: port 2(bridge_slave_1) entered disabled state
[  104.051554][ T3176] bridge_slave_0: left allmulticast mode
[  104.054062][ T3176] bridge_slave_0: left promiscuous mode
[  104.057218][ T3176] bridge0: port 1(bridge_slave_0) entered disabled state
[  104.545415][ T3176] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[  104.553764][ T3176] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[  104.562155][ T3176] bond0 (unregistering): Released all slaves
[  104.659968][ T3176] hsr_slave_0: left promiscuous mode
[  104.670937][ T3176] hsr_slave_1: left promiscuous mode
[  104.674054][ T3176] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[  104.677385][ T3176] batman_adv: batadv0: Removing interface: batadv_slave_0
[  104.690798][ T3176] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[  104.694143][ T3176] batman_adv: batadv0: Removing interface: batadv_slave_1
[  104.725318][ T3176] veth1_macvtap: left promiscuous mode
[  104.728163][ T3176] veth0_macvtap: left promiscuous mode
[  104.740063][ T3176] veth1_vlan: left promiscuous mode
[  104.742729][ T3176] veth0_vlan: left promiscuous mode
[  105.313572][ T3176] team0 (unregistering): Port device team_slave_1 removed
[  105.339355][ T3176] team0 (unregistering): Port device team_slave_0 removed
[  105.796058][  T121] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  105.808579][  T121] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  105.881616][ T2675] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  105.885170][ T2675] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  107.394781][   T47] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[  107.400561][   T47] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[  107.404312][   T47] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[  107.407829][   T47] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[  107.411305][   T47] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
2026/01/24 02:54:09 executed programs: 0
[  109.779486][ T4679] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[  109.787415][ T4679] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[  109.798937][ T4679] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[  109.802802][ T4679] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[  109.806405][ T4679] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[  109.971073][ T5468] chnl_net:caif_netlink_parms(): no params data found
[  110.035694][ T5468] bridge0: port 1(bridge_slave_0) entered blocking state
[  110.038872][ T5468] bridge0: port 1(bridge_slave_0) entered disabled state
[  110.042879][ T5468] bridge_slave_0: entered allmulticast mode
[  110.046892][ T5468] bridge_slave_0: entered promiscuous mode
[  110.052635][ T5468] bridge0: port 2(bridge_slave_1) entered blocking state
[  110.055850][ T5468] bridge0: port 2(bridge_slave_1) entered disabled state
[  110.059294][ T5468] bridge_slave_1: entered allmulticast mode
[  110.063805][ T5468] bridge_slave_1: entered promiscuous mode
[  110.088619][ T5468] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[  110.096699][ T5468] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[  110.121522][ T5468] team0: Port device team_slave_0 added
[  110.126364][ T5468] team0: Port device team_slave_1 added
[  110.147693][ T5468] batman_adv: batadv0: Adding interface: batadv_slave_0
[  110.151139][ T5468] 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.
[  110.162856][ T5468] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[  110.169064][ T5468] batman_adv: batadv0: Adding interface: batadv_slave_1
[  110.173068][ T5468] 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.
[  110.184937][ T5468] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[  110.222828][ T5468] hsr_slave_0: entered promiscuous mode
[  110.226078][ T5468] hsr_slave_1: entered promiscuous mode
[  110.681832][ T5468] netdevsim netdevsim0 netdevsim0: renamed from eth0
[  110.701570][ T5468] netdevsim netdevsim0 netdevsim1: renamed from eth1
[  110.722897][ T5468] netdevsim netdevsim0 netdevsim2: renamed from eth2
[  110.733386][ T5468] netdevsim netdevsim0 netdevsim3: renamed from eth3
[  110.781661][ T5468] bridge0: port 2(bridge_slave_1) entered blocking state
[  110.785282][ T5468] bridge0: port 2(bridge_slave_1) entered forwarding state
[  110.789391][ T5468] bridge0: port 1(bridge_slave_0) entered blocking state
[  110.792753][ T5468] bridge0: port 1(bridge_slave_0) entered forwarding state
[  110.942109][ T5468] 8021q: adding VLAN 0 to HW filter on device bond0
[  110.969901][ T2675] bridge0: port 1(bridge_slave_0) entered disabled state
[  110.978354][ T2675] bridge0: port 2(bridge_slave_1) entered disabled state
[  111.027385][ T5468] 8021q: adding VLAN 0 to HW filter on device team0
[  111.048391][   T54] bridge0: port 1(bridge_slave_0) entered blocking state
[  111.051782][   T54] bridge0: port 1(bridge_slave_0) entered forwarding state
[  111.075709][   T54] bridge0: port 2(bridge_slave_1) entered blocking state
[  111.078982][   T54] bridge0: port 2(bridge_slave_1) entered forwarding state
[  111.135348][ T5468] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
[  111.151290][ T5468] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
[  111.425603][ T5468] 8021q: adding VLAN 0 to HW filter on device batadv0
[  111.498264][ T5468] veth0_vlan: entered promiscuous mode
[  111.516762][ T5468] veth1_vlan: entered promiscuous mode
[  111.581679][ T5468] veth0_macvtap: entered promiscuous mode
[  111.588067][ T5468] veth1_macvtap: entered promiscuous mode
[  111.636163][ T5468] batman_adv: batadv0: Interface activated: batadv_slave_0
[  111.654486][ T5468] batman_adv: batadv0: Interface activated: batadv_slave_1
[  111.681751][   T54] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[  111.693652][   T54] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[  111.697613][   T54] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[  111.721063][   T54] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[  111.841543][ T4679] Bluetooth: hci0: command tx timeout
[  111.846273][   T54] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  111.862418][   T54] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  111.915942][ T2675] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  111.919437][ T2675] 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)
[  113.185721][ T2675] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  114.092939][ T2675] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  114.779520][ T2675] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  114.814448][ T2675] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  114.940222][ T2675] bridge_slave_1: left allmulticast mode
[  114.942789][ T2675] bridge_slave_1: left promiscuous mode
[  114.945432][ T2675] bridge0: port 2(bridge_slave_1) entered disabled state
[  114.952400][ T2675] bridge_slave_0: left allmulticast mode
[  114.961053][ T2675] bridge_slave_0: left promiscuous mode
[  114.963728][ T2675] bridge0: port 1(bridge_slave_0) entered disabled state
[  115.318964][ T2675] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[  115.324999][ T2675] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[  115.331318][ T2675] bond0 (unregistering): Released all slaves
[  115.592113][ T2675] hsr_slave_0: left promiscuous mode
[  115.595090][ T2675] hsr_slave_1: left promiscuous mode
[  115.598227][ T2675] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[  115.609818][ T2675] batman_adv: batadv0: Removing interface: batadv_slave_0
[  115.620539][ T2675] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[  115.623809][ T2675] batman_adv: batadv0: Removing interface: batadv_slave_1
[  115.653456][ T2675] veth1_macvtap: left promiscuous mode
[  115.656041][ T2675] veth0_macvtap: left promiscuous mode
[  115.658586][ T2675] veth1_vlan: left promiscuous mode
[  115.672194][ T2675] veth0_vlan: left promiscuous mode
[  116.054946][ T2675] team0 (unregistering): Port device team_slave_1 removed
[  116.083890][ T2675] team0 (unregistering): Port device team_slave_0 removed


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-build300597340=/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 d1b870e1003b
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=d1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/google/syzkaller/prog.gitRevisionDate=20251128-125159"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/google/syzkaller/prog.gitRevisionDate=20251128-125159"  ./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=d1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/google/syzkaller/prog.gitRevisionDate=20251128-125159"  -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=\"d1b870e1003b52891d2196c1e2ee42fe905010ba\"
/usr/bin/ld: /tmp/ccfY90mY.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): 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


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=17234452580000


Tested on:

commit:         62085877 Merge tag 'kbuild-fixes-6.19-2' of git://git...
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=1ba50d4b1e937c1e
dashboard link: https://syzkaller.appspot.com/bug?extid=44c564a3cb08605f34a1
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=137d4452580000

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