Message-ID: <695a5950.050a0220.a1b6.038b.GAE@google.com>
Date: Sun, 04 Jan 2026 04:13:04 -0800
From: syzbot <syzbot+7960178e777909060224@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_move_extents

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 '10.128.1.219' (ED25519) to the list of known hosts.
1970/01/01 00:00:34 parsed 1 programs
[   35.368679][ T6574] cgroup: Unknown subsys name 'net'
[   35.518825][ T6574] cgroup: Unknown subsys name 'cpuset'
[   35.520855][ T6574] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   35.685173][ T6574] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k SS
[   40.400277][ T6586] 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.
[   40.450081][   T54] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   40.451483][   T54] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   40.452760][   T54] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   40.454399][   T54] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   40.454879][   T54] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   41.019801][  T665] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   41.021379][  T665] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   41.031059][ T2279] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   41.031085][ T2279] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   41.583698][ T6649] chnl_net:caif_netlink_parms(): no params data found
[   41.609406][ T6649] bridge0: port 1(bridge_slave_0) entered blocking state
[   41.609720][ T6649] bridge0: port 1(bridge_slave_0) entered disabled state
[   41.609790][ T6649] bridge_slave_0: entered allmulticast mode
[   41.610269][ T6649] bridge_slave_0: entered promiscuous mode
[   41.611532][ T6649] bridge0: port 2(bridge_slave_1) entered blocking state
[   41.611581][ T6649] bridge0: port 2(bridge_slave_1) entered disabled state
[   41.611628][ T6649] bridge_slave_1: entered allmulticast mode
[   41.612126][ T6649] bridge_slave_1: entered promiscuous mode
[   41.769528][ T6649] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   41.771249][ T6649] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   41.780103][ T6649] team0: Port device team_slave_0 added
[   41.780818][ T6649] team0: Port device team_slave_1 added
[   41.790649][ T6649] batman_adv: batadv0: Adding interface: batadv_slave_0
[   41.790680][ T6649] 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.
[   41.790691][ T6649] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   41.791516][ T6649] batman_adv: batadv0: Adding interface: batadv_slave_1
[   41.791523][ T6649] 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.
[   41.791533][ T6649] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   41.807061][ T6649] hsr_slave_0: entered promiscuous mode
[   41.810815][ T6649] hsr_slave_1: entered promiscuous mode
[   41.898789][ T6649] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   41.903770][ T6649] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   41.909745][ T6649] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   41.912223][ T6649] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   41.932335][ T6649] bridge0: port 2(bridge_slave_1) entered blocking state
[   41.932389][ T6649] bridge0: port 2(bridge_slave_1) entered forwarding state
[   41.932576][ T6649] bridge0: port 1(bridge_slave_0) entered blocking state
[   41.932600][ T6649] bridge0: port 1(bridge_slave_0) entered forwarding state
[   41.950083][ T6649] 8021q: adding VLAN 0 to HW filter on device bond0
[   41.953039][ T6649] 8021q: adding VLAN 0 to HW filter on device team0
[   41.956166][ T4711] bridge0: port 2(bridge_slave_1) entered disabled state
[   41.962271][ T4711] bridge0: port 2(bridge_slave_1) entered blocking state
[   41.962317][ T4711] bridge0: port 2(bridge_slave_1) entered forwarding state
[   42.020809][ T6649] 8021q: adding VLAN 0 to HW filter on device batadv0
[   42.110437][ T6649] veth0_vlan: entered promiscuous mode
[   42.114122][ T6649] veth1_vlan: entered promiscuous mode
[   42.120282][ T6649] veth0_macvtap: entered promiscuous mode
[   42.121245][ T6649] veth1_macvtap: entered promiscuous mode
[   42.124225][ T6649] batman_adv: batadv0: Interface activated: batadv_slave_0
[   42.125248][ T6649] batman_adv: batadv0: Interface activated: batadv_slave_1
[   42.128701][ T2279] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   42.134787][ T2279] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   42.137773][ T2279] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   42.139406][ T2279] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   42.396071][ T3493] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   42.448150][ T3493] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   42.492358][ T3493] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   42.523235][ T3493] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
1970/01/01 00:00:42 executed programs: 0
[   42.620968][ T6162] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   42.621402][ T6162] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   42.621559][ T6162] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   42.621826][ T6162] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   42.622034][ T6162] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   42.682551][ T6680] chnl_net:caif_netlink_parms(): no params data found
[   42.712641][ T6680] bridge0: port 1(bridge_slave_0) entered blocking state
[   42.712724][ T6680] bridge0: port 1(bridge_slave_0) entered disabled state
[   42.712777][ T6680] bridge_slave_0: entered allmulticast mode
[   42.713184][ T6680] bridge_slave_0: entered promiscuous mode
[   42.714242][ T6680] bridge0: port 2(bridge_slave_1) entered blocking state
[   42.714283][ T6680] bridge0: port 2(bridge_slave_1) entered disabled state
[   42.714384][ T6680] bridge_slave_1: entered allmulticast mode
[   42.714776][ T6680] bridge_slave_1: entered promiscuous mode
[   42.726857][ T6680] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   42.728599][ T6680] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   42.735632][ T6680] team0: Port device team_slave_0 added
[   42.736314][ T6680] team0: Port device team_slave_1 added
[   42.744061][ T6680] batman_adv: batadv0: Adding interface: batadv_slave_0
[   42.744082][ T6680] 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.
[   42.744093][ T6680] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   42.744597][ T6680] batman_adv: batadv0: Adding interface: batadv_slave_1
[   42.744604][ T6680] 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.
[   42.744616][ T6680] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   42.763647][ T6680] hsr_slave_0: entered promiscuous mode
[   42.763978][ T6680] hsr_slave_1: entered promiscuous mode
[   42.764187][ T6680] debugfs: 'hsr0' already exists in 'hsr'
[   42.764243][ T6680] Cannot create hsr debugfs directory
[   44.657600][ T6162] Bluetooth: hci0: command tx timeout
[   45.526983][ T3493] bridge_slave_1: left allmulticast mode
[   45.527025][ T3493] bridge_slave_1: left promiscuous mode
[   45.527335][ T3493] bridge0: port 2(bridge_slave_1) entered disabled state
[   45.531267][ T3493] bridge_slave_0: left allmulticast mode
[   45.531293][ T3493] bridge_slave_0: left promiscuous mode
[   45.531707][ T3493] bridge0: port 1(bridge_slave_0) entered disabled state
[   45.690850][ T3493] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   45.738535][ T3493] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   45.758115][ T3493] bond0 (unregistering): Released all slaves
[   45.865531][ T3493] hsr_slave_0: left promiscuous mode
[   45.866557][ T3493] hsr_slave_1: left promiscuous mode
[   45.866799][ T3493] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   45.866814][ T3493] batman_adv: batadv0: Removing interface: batadv_slave_0
[   45.867166][ T3493] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   45.867175][ T3493] batman_adv: batadv0: Removing interface: batadv_slave_1
[   45.872105][ T3493] veth1_macvtap: left promiscuous mode
[   45.872150][ T3493] veth0_macvtap: left promiscuous mode
[   45.872196][ T3493] veth1_vlan: left promiscuous mode
[   45.872238][ T3493] veth0_vlan: left promiscuous mode
[   45.996095][ T3493] team0 (unregistering): Port device team_slave_1 removed
[   46.003774][ T3493] team0 (unregistering): Port device team_slave_0 removed
[   46.225760][ T6680] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   46.232604][ T6680] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   46.234707][ T6680] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   46.237167][ T6680] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   46.261677][ T6680] 8021q: adding VLAN 0 to HW filter on device bond0
[   46.266957][ T6680] 8021q: adding VLAN 0 to HW filter on device team0
[   46.270074][ T3254] bridge0: port 1(bridge_slave_0) entered blocking state
[   46.270110][ T3254] bridge0: port 1(bridge_slave_0) entered forwarding state
[   46.275115][ T4711] bridge0: port 2(bridge_slave_1) entered blocking state
[   46.275153][ T4711] bridge0: port 2(bridge_slave_1) entered forwarding state
[   46.284016][ T6680] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
[   46.284050][ T6680] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
[   46.358561][ T6680] 8021q: adding VLAN 0 to HW filter on device batadv0
[   46.368605][ T6680] veth0_vlan: entered promiscuous mode
[   46.395889][ T6680] veth1_vlan: entered promiscuous mode
[   46.404311][ T6680] veth0_macvtap: entered promiscuous mode
[   46.405230][ T6680] veth1_macvtap: entered promiscuous mode
[   46.409393][ T6680] batman_adv: batadv0: Interface activated: batadv_slave_0
[   46.410386][ T6680] batman_adv: batadv0: Interface activated: batadv_slave_1
[   46.414486][ T3254] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   46.414529][ T3254] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   46.414547][ T3254] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   46.414559][ T3254] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   46.444909][ T3161] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   46.444938][ T3161] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   46.455559][ T3254] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   46.455589][ T3254] 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)


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-build1922670529=/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=arm64 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_arm64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_arm64
aarch64-linux-gnu-g++ -o ./bin/linux_arm64/syz-executor executor/executor.cc \
	-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_arm64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d6526ea3e6ad9081c902859bbb80f9f840377cb4\"
/usr/lib/gcc-cross/aarch64-linux-gnu/12/../../../../aarch64-linux-gnu/bin/ld: /tmp/ccdEik0m.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0xd8): 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:         aacb0a6d Merge tag 'pmdomain-v6.19-rc3' of git://git.k..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=8a8594efdc14f07a
dashboard link: https://syzkaller.appspot.com/bug?extid=7960178e777909060224
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14b0aefc580000

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