Message-ID: <695a61fa.050a0220.a5285.0006.GAE@google.com>
Date: Sun, 04 Jan 2026 04:50:02 -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 '10.128.1.154' (ED25519) to the list of known hosts.
1970/01/01 00:00:33 parsed 1 programs
[   35.019899][ T6570] cgroup: Unknown subsys name 'net'
[   35.169865][ T6570] cgroup: Unknown subsys name 'cpuset'
[   35.171841][ T6570] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   35.327762][ T6570] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k SS
[   38.541672][ T6576] 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.
[   38.821145][ T6594] chnl_net:caif_netlink_parms(): no params data found
[   38.844506][ T6594] bridge0: port 1(bridge_slave_0) entered blocking state
[   38.846159][ T6594] bridge0: port 1(bridge_slave_0) entered disabled state
[   38.847991][ T6594] bridge_slave_0: entered allmulticast mode
[   38.850088][ T6594] bridge_slave_0: entered promiscuous mode
[   38.851838][ T6594] bridge0: port 2(bridge_slave_1) entered blocking state
[   38.851911][ T6594] bridge0: port 2(bridge_slave_1) entered disabled state
[   38.851993][ T6594] bridge_slave_1: entered allmulticast mode
[   38.852444][ T6594] bridge_slave_1: entered promiscuous mode
[   38.863463][ T6594] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   38.864431][ T6594] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   38.871785][ T6594] team0: Port device team_slave_0 added
[   38.872531][ T6594] team0: Port device team_slave_1 added
[   38.880123][ T6594] batman_adv: batadv0: Adding interface: batadv_slave_0
[   38.880146][ T6594] 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.
[   38.880157][ T6594] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   38.880878][ T6594] batman_adv: batadv0: Adding interface: batadv_slave_1
[   38.880884][ T6594] 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.
[   38.880896][ T6594] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   38.900759][ T6594] hsr_slave_0: entered promiscuous mode
[   38.901496][ T6594] hsr_slave_1: entered promiscuous mode
[   39.019802][ T6594] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   39.022735][ T6594] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   39.026056][ T6594] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   39.030476][ T6594] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   39.040899][ T6594] bridge0: port 2(bridge_slave_1) entered blocking state
[   39.040944][ T6594] bridge0: port 2(bridge_slave_1) entered forwarding state
[   39.041136][ T6594] bridge0: port 1(bridge_slave_0) entered blocking state
[   39.041166][ T6594] bridge0: port 1(bridge_slave_0) entered forwarding state
[   39.060673][ T6594] 8021q: adding VLAN 0 to HW filter on device bond0
[   39.065590][ T6000] bridge0: port 1(bridge_slave_0) entered disabled state
[   39.066991][ T6000] bridge0: port 2(bridge_slave_1) entered disabled state
[   39.072113][ T6594] 8021q: adding VLAN 0 to HW filter on device team0
[   39.075835][   T41] bridge0: port 1(bridge_slave_0) entered blocking state
[   39.075879][   T41] bridge0: port 1(bridge_slave_0) entered forwarding state
[   39.079965][ T6000] bridge0: port 2(bridge_slave_1) entered blocking state
[   39.080006][ T6000] bridge0: port 2(bridge_slave_1) entered forwarding state
[   39.130335][ T6594] 8021q: adding VLAN 0 to HW filter on device batadv0
[   39.141348][ T6594] veth0_vlan: entered promiscuous mode
[   39.143085][ T6594] veth1_vlan: entered promiscuous mode
[   39.155611][ T6594] veth0_macvtap: entered promiscuous mode
[   39.156646][ T6594] veth1_macvtap: entered promiscuous mode
[   39.160570][ T6594] batman_adv: batadv0: Interface activated: batadv_slave_0
[   39.162123][ T6594] batman_adv: batadv0: Interface activated: batadv_slave_1
[   39.164910][ T1363] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   39.166606][ T1363] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   39.168083][ T1363] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   39.170745][ T1363] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   39.406189][ T1363] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   39.444497][ T1363] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   39.473743][ T1363] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   39.524362][ T1363] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   39.814108][ T6158] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   39.815484][ T6158] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   39.816766][ T6158] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   39.818220][ T6158] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   39.820151][ T6158] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   39.937382][ T6000] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   39.940080][ T6000] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   39.950954][   T41] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   39.950985][   T41] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
1970/01/01 00:00:40 executed programs: 0
[   40.264655][   T53] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   40.266064][   T53] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   40.267409][   T53] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   40.268986][   T53] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   40.269215][   T53] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   40.322464][ T6675] chnl_net:caif_netlink_parms(): no params data found
[   40.344361][ T6675] bridge0: port 1(bridge_slave_0) entered blocking state
[   40.344447][ T6675] bridge0: port 1(bridge_slave_0) entered disabled state
[   40.344524][ T6675] bridge_slave_0: entered allmulticast mode
[   40.344957][ T6675] bridge_slave_0: entered promiscuous mode
[   40.345764][ T6675] bridge0: port 2(bridge_slave_1) entered blocking state
[   40.345802][ T6675] bridge0: port 2(bridge_slave_1) entered disabled state
[   40.345855][ T6675] bridge_slave_1: entered allmulticast mode
[   40.346260][ T6675] bridge_slave_1: entered promiscuous mode
[   40.360567][ T6675] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   40.361585][ T6675] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   40.369582][ T6675] team0: Port device team_slave_0 added
[   40.370426][ T6675] team0: Port device team_slave_1 added
[   40.377491][ T6675] batman_adv: batadv0: Adding interface: batadv_slave_0
[   40.377520][ T6675] 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.
[   40.377530][ T6675] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   40.378071][ T6675] batman_adv: batadv0: Adding interface: batadv_slave_1
[   40.378078][ T6675] 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.
[   40.378092][ T6675] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   40.396765][ T6675] hsr_slave_0: entered promiscuous mode
[   40.397130][ T6675] hsr_slave_1: entered promiscuous mode
[   40.397400][ T6675] debugfs: 'hsr0' already exists in 'hsr'
[   40.397446][ T6675] Cannot create hsr debugfs directory
[   42.338625][   T53] Bluetooth: hci0: command tx timeout
[   42.750251][ T1363] bridge_slave_1: left allmulticast mode
[   42.751718][ T1363] bridge_slave_1: left promiscuous mode
[   42.753029][ T1363] bridge0: port 2(bridge_slave_1) entered disabled state
[   42.756999][ T1363] bridge_slave_0: left allmulticast mode
[   42.757026][ T1363] bridge_slave_0: left promiscuous mode
[   42.757254][ T1363] bridge0: port 1(bridge_slave_0) entered disabled state
[   42.891188][ T1363] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   42.930347][ T1363] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   42.969401][ T1363] bond0 (unregistering): Released all slaves
[   43.047614][ T1363] hsr_slave_0: left promiscuous mode
[   43.048883][ T1363] hsr_slave_1: left promiscuous mode
[   43.049257][ T1363] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   43.049272][ T1363] batman_adv: batadv0: Removing interface: batadv_slave_0
[   43.049958][ T1363] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   43.049971][ T1363] batman_adv: batadv0: Removing interface: batadv_slave_1
[   43.058208][ T1363] veth1_macvtap: left promiscuous mode
[   43.058276][ T1363] veth0_macvtap: left promiscuous mode
[   43.061807][ T1363] veth1_vlan: left promiscuous mode
[   43.061928][ T1363] veth0_vlan: left promiscuous mode
[   43.188337][ T1363] team0 (unregistering): Port device team_slave_1 removed
[   43.196317][ T1363] team0 (unregistering): Port device team_slave_0 removed
[   43.592110][ T6675] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   43.597199][ T6675] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   43.604301][ T6675] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   43.610168][ T6675] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   43.802634][ T6675] 8021q: adding VLAN 0 to HW filter on device bond0
[   43.807211][ T6675] 8021q: adding VLAN 0 to HW filter on device team0
[   43.812470][   T41] bridge0: port 1(bridge_slave_0) entered blocking state
[   43.812525][   T41] bridge0: port 1(bridge_slave_0) entered forwarding state
[   43.815590][   T41] bridge0: port 2(bridge_slave_1) entered blocking state
[   43.815623][   T41] bridge0: port 2(bridge_slave_1) entered forwarding state
[   43.825587][ T6675] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
[   43.827346][ T6675] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
[   43.877183][ T6675] 8021q: adding VLAN 0 to HW filter on device batadv0
[   43.956121][ T6675] veth0_vlan: entered promiscuous mode
[   43.960507][ T6675] veth1_vlan: entered promiscuous mode
[   43.967761][ T6675] veth0_macvtap: entered promiscuous mode
[   43.969411][ T6675] veth1_macvtap: entered promiscuous mode
[   43.972946][ T6675] batman_adv: batadv0: Interface activated: batadv_slave_0
[   43.973874][ T6675] batman_adv: batadv0: Interface activated: batadv_slave_1
[   43.977814][ T6000] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   43.978209][ T6000] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   43.978229][ T6000] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   43.978242][ T6000] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   44.017149][   T41] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   44.018782][   T41] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   44.025789][   T41] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   44.027411][   T41] 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-build4280937287=/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/ccdUkBWA.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=10b44f92580000

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