Message-ID: <6981987e.050a0220.3b3015.0005.GAE@google.com>
Date: Mon, 02 Feb 2026 22:41:02 -0800
From: syzbot <syzbot+7de5fe447862fc37576f@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data (4)

Hello,

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

7.803022][ T5881] bridge0: port 1(bridge_slave_0) entered disabled state
[  117.810281][ T5881] bridge_slave_0: entered allmulticast mode
[  117.819858][ T5881] bridge_slave_0: entered promiscuous mode
[  117.831267][ T5881] bridge0: port 2(bridge_slave_1) entered blocking state
[  117.838798][ T5881] bridge0: port 2(bridge_slave_1) entered disabled state
[  117.846248][ T5881] bridge_slave_1: entered allmulticast mode
[  117.855838][ T5881] bridge_slave_1: entered promiscuous mode
[  117.964803][ T5881] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[  117.987234][ T5881] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[  118.040452][ T5881] team0: Port device team_slave_0 added
[  118.049944][ T5881] team0: Port device team_slave_1 added
[  118.080161][ T5881] batman_adv: batadv0: Adding interface: batadv_slave_0
[  118.087318][ T5881] 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.
[  118.113896][ T5881] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[  118.127434][ T5881] batman_adv: batadv0: Adding interface: batadv_slave_1
[  118.134435][ T5881] 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.
[  118.161467][ T5881] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[  118.211366][ T5881] hsr_slave_0: entered promiscuous mode
[  118.218209][ T5881] hsr_slave_1: entered promiscuous mode
[  118.391881][ T5881] netdevsim netdevsim5 netdevsim0: renamed from eth0
[  118.406093][ T5881] netdevsim netdevsim5 netdevsim1: renamed from eth1
[  118.416923][ T5881] netdevsim netdevsim5 netdevsim2: renamed from eth2
[  118.430035][ T5881] netdevsim netdevsim5 netdevsim3: renamed from eth3
[  118.468949][ T5881] bridge0: port 2(bridge_slave_1) entered blocking state
[  118.476261][ T5881] bridge0: port 2(bridge_slave_1) entered forwarding state
[  118.484301][ T5881] bridge0: port 1(bridge_slave_0) entered blocking state
[  118.491418][ T5881] bridge0: port 1(bridge_slave_0) entered forwarding state
[  118.556461][ T5881] 8021q: adding VLAN 0 to HW filter on device bond0
[  118.575455][   T13] bridge0: port 1(bridge_slave_0) entered disabled state
[  118.584555][   T13] bridge0: port 2(bridge_slave_1) entered disabled state
[  118.604576][ T5881] 8021q: adding VLAN 0 to HW filter on device team0
[  118.618950][ T5905] bridge0: port 1(bridge_slave_0) entered blocking state
[  118.626262][ T5905] bridge0: port 1(bridge_slave_0) entered forwarding state
[  118.641589][ T2132] bridge0: port 2(bridge_slave_1) entered blocking state
[  118.648732][ T2132] bridge0: port 2(bridge_slave_1) entered forwarding state
[  118.895513][ T5881] 8021q: adding VLAN 0 to HW filter on device batadv0
[  119.170167][ T5881] veth0_vlan: entered promiscuous mode
[  119.183445][ T5881] veth1_vlan: entered promiscuous mode
[  119.217895][ T5881] veth0_macvtap: entered promiscuous mode
[  119.230062][ T5881] veth1_macvtap: entered promiscuous mode
[  119.249484][ T5881] batman_adv: batadv0: Interface activated: batadv_slave_0
[  119.265203][ T5881] batman_adv: batadv0: Interface activated: batadv_slave_1
[  119.281302][ T5905] netdevsim netdevsim5 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[  119.290696][ T5905] netdevsim netdevsim5 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[  119.300369][ T5905] netdevsim netdevsim5 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[  119.313654][ T5905] netdevsim netdevsim5 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
2026/02/03 06:39:51 executed programs: 0
[  119.488752][ T5846] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[  119.497059][ T5846] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[  119.508423][ T5846] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[  119.519074][ T5846] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[  119.528291][ T5846] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[  119.738092][ T5936] chnl_net:caif_netlink_parms(): no params data found
[  119.833656][ T5936] bridge0: port 1(bridge_slave_0) entered blocking state
[  119.840781][ T5936] bridge0: port 1(bridge_slave_0) entered disabled state
[  119.848988][ T5936] bridge_slave_0: entered allmulticast mode
[  119.857076][ T5936] bridge_slave_0: entered promiscuous mode
[  119.869222][ T5936] bridge0: port 2(bridge_slave_1) entered blocking state
[  119.876576][ T5936] bridge0: port 2(bridge_slave_1) entered disabled state
[  119.883996][ T5936] bridge_slave_1: entered allmulticast mode
[  119.891511][ T5936] bridge_slave_1: entered promiscuous mode
[  119.931741][ T5936] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[  119.946072][ T5936] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[  119.983868][ T5936] team0: Port device team_slave_0 added
[  119.992048][ T5936] team0: Port device team_slave_1 added
[  120.022350][ T5936] batman_adv: batadv0: Adding interface: batadv_slave_0
[  120.029883][ T5936] 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.
[  120.055907][ T5936] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[  120.068732][ T5936] batman_adv: batadv0: Adding interface: batadv_slave_1
[  120.076584][ T5936] 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.
[  120.103079][ T5936] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[  120.160728][ T5936] hsr_slave_0: entered promiscuous mode
[  120.167486][ T5936] hsr_slave_1: entered promiscuous mode
[  120.173976][ T5936] debugfs: 'hsr0' already exists in 'hsr'
[  120.179816][ T5936] Cannot create hsr debugfs directory
[  120.371660][ T5936] netdevsim netdevsim0 netdevsim0: renamed from eth0
[  120.383411][ T5936] netdevsim netdevsim0 netdevsim1: renamed from eth1
[  120.395486][ T5936] netdevsim netdevsim0 netdevsim2: renamed from eth2
[  120.407081][ T5936] netdevsim netdevsim0 netdevsim3: renamed from eth3
[  120.444116][ T5936] bridge0: port 2(bridge_slave_1) entered blocking state
[  120.451327][ T5936] bridge0: port 2(bridge_slave_1) entered forwarding state
[  120.458951][ T5936] bridge0: port 1(bridge_slave_0) entered blocking state
[  120.466187][ T5936] bridge0: port 1(bridge_slave_0) entered forwarding state
[  120.532648][ T5936] 8021q: adding VLAN 0 to HW filter on device bond0
[  120.551871][ T5905] bridge0: port 1(bridge_slave_0) entered disabled state
[  120.560861][ T5905] bridge0: port 2(bridge_slave_1) entered disabled state
[  120.578330][ T5936] 8021q: adding VLAN 0 to HW filter on device team0
[  120.596322][ T5905] bridge0: port 1(bridge_slave_0) entered blocking state
[  120.603482][ T5905] bridge0: port 1(bridge_slave_0) entered forwarding state
[  120.620189][ T5905] bridge0: port 2(bridge_slave_1) entered blocking state
[  120.627367][ T5905] bridge0: port 2(bridge_slave_1) entered forwarding state
[  120.876511][ T5936] 8021q: adding VLAN 0 to HW filter on device batadv0
[  120.941415][ T5936] veth0_vlan: entered promiscuous mode
[  120.955295][ T5936] veth1_vlan: entered promiscuous mode
[  120.996769][ T5936] veth0_macvtap: entered promiscuous mode
[  121.030937][ T5936] veth1_macvtap: entered promiscuous mode
[  121.060700][ T5936] batman_adv: batadv0: Interface activated: batadv_slave_0
[  121.083217][ T5936] batman_adv: batadv0: Interface activated: batadv_slave_1
[  121.100665][   T34] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[  121.114592][   T34] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[  121.129374][   T34] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[  121.139911][   T34] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[  121.259772][   T13] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  121.276099][   T13] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  121.334029][   T13] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  121.348481][   T13] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  121.624061][ T5846] Bluetooth: hci0: command tx timeout
[  122.480058][ T2132] netdevsim netdevsim5 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  122.614940][ T2132] netdevsim netdevsim5 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  122.677461][ T2132] netdevsim netdevsim5 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  122.765200][ T2132] netdevsim netdevsim5 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  122.892181][ T2132] bridge_slave_1: left allmulticast mode
[  122.899779][ T2132] bridge_slave_1: left promiscuous mode
[  122.912634][ T2132] bridge0: port 2(bridge_slave_1) entered disabled state
[  122.925287][ T2132] bridge_slave_0: left allmulticast mode
[  122.930925][ T2132] bridge_slave_0: left promiscuous mode
[  122.937341][ T2132] bridge0: port 1(bridge_slave_0) entered disabled state
[  123.241250][ T2132] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[  123.252798][ T2132] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[  123.265182][ T2132] bond0 (unregistering): Released all slaves
[  123.401903][ T2132] hsr_slave_0: left promiscuous mode
[  123.421750][ T2132] hsr_slave_1: left promiscuous mode
[  123.432923][ T2132] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[  123.440515][ T2132] batman_adv: batadv0: Removing interface: batadv_slave_0
[  123.452803][ T2132] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[  123.460196][ T2132] batman_adv: batadv0: Removing interface: batadv_slave_1
[  123.484568][ T2132] veth1_macvtap: left promiscuous mode
[  123.490264][ T2132] veth0_macvtap: left promiscuous mode
[  123.503364][ T2132] veth1_vlan: left promiscuous mode
[  123.508800][ T2132] veth0_vlan: left promiscuous mode
[  124.033040][ T2132] team0 (unregistering): Port device team_slave_1 removed
[  124.061067][ T2132] team0 (unregistering): Port device team_slave_0 removed
[  124.698727][ T2132] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  124.899694][ T2132] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  125.003107][ T2132] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  125.085927][ T2132] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  125.224675][ T2132] bridge_slave_1: left allmulticast mode
[  125.230380][ T2132] bridge_slave_1: left promiscuous mode
[  125.241960][ T2132] bridge0: port 2(bridge_slave_1) entered disabled state
[  125.253765][ T2132] bridge_slave_0: left allmulticast mode
[  125.259444][ T2132] bridge_slave_0: left promiscuous mode
[  125.266172][ T2132] bridge0: port 1(bridge_slave_0) entered disabled state
[  125.549618][ T2132] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[  125.562289][ T2132] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[  125.572575][ T2132] bond0 (unregistering): Released all slaves
[  125.917232][ T2132] hsr_slave_0: left promiscuous mode
[  125.924888][ T2132] hsr_slave_1: left promiscuous mode
[  125.931026][ T2132] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[  125.938692][ T2132] batman_adv: batadv0: Removing interface: batadv_slave_0
[  125.963619][ T2132] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[  125.973608][ T2132] batman_adv: batadv0: Removing interface: batadv_slave_1
[  125.998685][ T2132] veth1_macvtap: left promiscuous mode
[  126.008645][ T2132] veth0_macvtap: left promiscuous mode
[  126.014461][ T2132] veth1_vlan: left promiscuous mode
[  126.019806][ T2132] veth0_vlan: left promiscuous mode
[  126.383253][ T2132] team0 (unregistering): Port device team_slave_1 removed
[  126.416986][ T2132] 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-build3992306483=/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 6b8752f20c
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=6b8752f20c06eee857545047ab920e63322bf4c8 -X github.com/google/syzkaller/prog.gitRevisionDate=20260131-204520"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=6b8752f20c06eee857545047ab920e63322bf4c8 -X github.com/google/syzkaller/prog.gitRevisionDate=20260131-204520"  ./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=6b8752f20c06eee857545047ab920e63322bf4c8 -X github.com/google/syzkaller/prog.gitRevisionDate=20260131-204520"  -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=\"6b8752f20c06eee857545047ab920e63322bf4c8\"
/usr/bin/ld: /tmp/ccfZbAsR.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=12934402580000


Tested on:

commit:         6bd9ed02 Merge tag 'cgroup-for-6.19-rc8-fixes' of git:..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=fea461e951c03b1b
dashboard link: https://syzkaller.appspot.com/bug?extid=7de5fe447862fc37576f
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15347322580000

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