Message-ID: <6923e348.a70a0220.d98e3.0078.GAE@google.com>
Date: Sun, 23 Nov 2025 20:47:04 -0800
From: syzbot <syzbot+2fefb910d2c20c0698d8@...kaller.appspotmail.com>
To: agruenba@...hat.com, almaz.alexandrovich@...agon-software.com, 
	brauner@...nel.org, dhowells@...hat.com, gfs2@...ts.linux.dev, jack@...e.cz, 
	linux-afs@...ts.infradead.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, marc.dionne@...istor.com, mjguzik@...il.com, 
	ntfs3@...ts.linux.dev, syzkaller-bugs@...glegroups.com, 
	viro@...iv.linux.org.uk
Subject: Re: [syzbot] [ntfs3?] INFO: task hung in __start_renaming

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 '10.128.1.240' (ED25519) to the list of known hosts.
2025/11/24 04:46:07 parsed 1 programs
[   90.555532][ T5834] cgroup: Unknown subsys name 'net'
[   90.669357][ T5834] cgroup: Unknown subsys name 'cpuset'
[   90.678428][ T5834] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   92.016508][   T10] cfg80211: failed to load regulatory.db
[   92.473167][ T5834] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   95.487085][ T5846] 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.
[   96.148644][ T5858] chnl_net:caif_netlink_parms(): no params data found
[   96.250234][ T5858] bridge0: port 1(bridge_slave_0) entered blocking state
[   96.258110][ T5858] bridge0: port 1(bridge_slave_0) entered disabled state
[   96.265979][ T5858] bridge_slave_0: entered allmulticast mode
[   96.273344][ T5858] bridge_slave_0: entered promiscuous mode
[   96.283227][ T5858] bridge0: port 2(bridge_slave_1) entered blocking state
[   96.290745][ T5858] bridge0: port 2(bridge_slave_1) entered disabled state
[   96.298585][ T5858] bridge_slave_1: entered allmulticast mode
[   96.306164][ T5858] bridge_slave_1: entered promiscuous mode
[   96.340272][ T5858] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   96.353486][ T5858] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   96.386615][ T5858] team0: Port device team_slave_0 added
[   96.394597][ T5858] team0: Port device team_slave_1 added
[   96.423182][ T5858] batman_adv: batadv0: Adding interface: batadv_slave_0
[   96.430950][ T5858] 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.
[   96.457421][ T5858] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   96.470037][ T5858] batman_adv: batadv0: Adding interface: batadv_slave_1
[   96.477137][ T5858] 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.
[   96.503196][ T5858] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   96.549258][ T5858] hsr_slave_0: entered promiscuous mode
[   96.556089][ T5858] hsr_slave_1: entered promiscuous mode
[   96.709149][ T5858] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   96.721617][ T5858] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   96.733093][ T5858] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   96.744474][ T5858] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   96.779618][ T5858] bridge0: port 2(bridge_slave_1) entered blocking state
[   96.786970][ T5858] bridge0: port 2(bridge_slave_1) entered forwarding state
[   96.794851][ T5858] bridge0: port 1(bridge_slave_0) entered blocking state
[   96.802116][ T5858] bridge0: port 1(bridge_slave_0) entered forwarding state
[   96.863750][ T5858] 8021q: adding VLAN 0 to HW filter on device bond0
[   96.883749][   T12] bridge0: port 1(bridge_slave_0) entered disabled state
[   96.893131][   T12] bridge0: port 2(bridge_slave_1) entered disabled state
[   96.915600][ T5858] 8021q: adding VLAN 0 to HW filter on device team0
[   96.931688][ T3534] bridge0: port 1(bridge_slave_0) entered blocking state
[   96.938987][ T3534] bridge0: port 1(bridge_slave_0) entered forwarding state
[   96.952476][   T12] bridge0: port 2(bridge_slave_1) entered blocking state
[   96.959687][   T12] bridge0: port 2(bridge_slave_1) entered forwarding state
[   97.144886][ T5858] 8021q: adding VLAN 0 to HW filter on device batadv0
[   97.200647][ T5858] veth0_vlan: entered promiscuous mode
[   97.212659][ T5858] veth1_vlan: entered promiscuous mode
[   97.247394][ T5858] veth0_macvtap: entered promiscuous mode
[   97.257672][ T5858] veth1_macvtap: entered promiscuous mode
[   97.279295][ T5858] batman_adv: batadv0: Interface activated: batadv_slave_0
[   97.293604][ T5858] batman_adv: batadv0: Interface activated: batadv_slave_1
[   97.311084][   T36] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   97.321470][   T36] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   97.333512][   T36] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   97.343962][   T36] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   97.489573][   T36] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   97.557912][   T36] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   97.656263][   T36] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   97.752469][   T36] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   98.236218][ T5896] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   98.244431][ T5896] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   98.253946][ T5896] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   98.264492][ T5896] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   98.272338][ T5896] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   99.530883][ T4188] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   99.539839][ T4188] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   99.571626][ T3534] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   99.579614][ T3534] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  100.426458][   T36] bridge_slave_1: left allmulticast mode
[  100.447450][   T36] bridge_slave_1: left promiscuous mode
[  100.454127][   T36] bridge0: port 2(bridge_slave_1) entered disabled state
[  100.480752][   T36] bridge_slave_0: left allmulticast mode
[  100.490779][   T36] bridge_slave_0: left promiscuous mode
[  100.505305][   T36] bridge0: port 1(bridge_slave_0) entered disabled state
2025/11/24 04:46:20 executed programs: 0
[  100.676852][ T5896] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[  100.686417][ T5896] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[  100.696621][ T5896] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[  100.710027][ T5896] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[  100.729116][ T5896] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[  101.000183][   T36] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[  101.015387][   T36] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[  101.029740][   T36] bond0 (unregistering): Released all slaves
[  101.191106][   T36] hsr_slave_0: left promiscuous mode
[  101.198191][   T36] hsr_slave_1: left promiscuous mode
[  101.204127][   T36] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[  101.212520][   T36] batman_adv: batadv0: Removing interface: batadv_slave_0
[  101.221975][   T36] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[  101.229631][   T36] batman_adv: batadv0: Removing interface: batadv_slave_1
[  101.245879][   T36] veth1_macvtap: left promiscuous mode
[  101.251698][   T36] veth0_macvtap: left promiscuous mode
[  101.258200][   T36] veth1_vlan: left promiscuous mode
[  101.263553][   T36] veth0_vlan: left promiscuous mode
[  101.580646][   T36] team0 (unregistering): Port device team_slave_1 removed
[  101.610626][   T36] team0 (unregistering): Port device team_slave_0 removed
[  102.143766][ T5949] chnl_net:caif_netlink_parms(): no params data found
[  102.560717][ T5949] bridge0: port 1(bridge_slave_0) entered blocking state
[  102.575166][ T5949] bridge0: port 1(bridge_slave_0) entered disabled state
[  102.582540][ T5949] bridge_slave_0: entered allmulticast mode
[  102.591585][ T5949] bridge_slave_0: entered promiscuous mode
[  102.614286][ T5949] bridge0: port 2(bridge_slave_1) entered blocking state
[  102.621909][ T5949] bridge0: port 2(bridge_slave_1) entered disabled state
[  102.629681][ T5949] bridge_slave_1: entered allmulticast mode
[  102.638831][ T5949] bridge_slave_1: entered promiscuous mode
[  102.698198][ T5949] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[  102.711869][ T5949] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[  102.815644][ T5149] Bluetooth: hci0: command tx timeout
[  103.123913][ T5949] team0: Port device team_slave_0 added
[  103.139960][ T5949] team0: Port device team_slave_1 added
[  103.229026][ T5949] batman_adv: batadv0: Adding interface: batadv_slave_0
[  103.239890][ T5949] 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.
[  103.266203][ T5949] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[  103.297209][ T5949] batman_adv: batadv0: Adding interface: batadv_slave_1
[  103.304455][ T5949] 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.
[  103.331586][ T5949] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[  103.553894][ T5949] hsr_slave_0: entered promiscuous mode
[  103.584330][ T5949] hsr_slave_1: entered promiscuous mode
[  104.403096][ T5949] netdevsim netdevsim0 netdevsim0: renamed from eth0
[  104.420683][ T5949] netdevsim netdevsim0 netdevsim1: renamed from eth1
[  104.435325][ T5949] netdevsim netdevsim0 netdevsim2: renamed from eth2
[  104.449213][ T5949] netdevsim netdevsim0 netdevsim3: renamed from eth3
[  104.617044][ T5949] 8021q: adding VLAN 0 to HW filter on device bond0
[  104.649084][ T5949] 8021q: adding VLAN 0 to HW filter on device team0
[  104.669296][ T3534] bridge0: port 1(bridge_slave_0) entered blocking state
[  104.676566][ T3534] bridge0: port 1(bridge_slave_0) entered forwarding state
[  104.700338][ T3534] bridge0: port 2(bridge_slave_1) entered blocking state
[  104.707610][ T3534] bridge0: port 2(bridge_slave_1) entered forwarding state
[  104.896202][ T5149] Bluetooth: hci0: command tx timeout
[  105.029734][ T5949] 8021q: adding VLAN 0 to HW filter on device batadv0
[  105.112846][ T5949] veth0_vlan: entered promiscuous mode
[  105.132429][ T5949] veth1_vlan: entered promiscuous mode
[  105.181476][ T5949] veth0_macvtap: entered promiscuous mode
[  105.200419][ T5949] veth1_macvtap: entered promiscuous mode
[  105.228009][ T5949] batman_adv: batadv0: Interface activated: batadv_slave_0
[  105.248759][ T5949] batman_adv: batadv0: Interface activated: batadv_slave_1
[  105.270101][ T3534] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[  105.283869][ T3534] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[  105.294419][ T3534] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[  105.317774][ T3534] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[  105.417418][   T36] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  105.434266][   T36] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  105.481687][ T3534] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  105.490831][ T3534] 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-build3558344338=/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 26ee52375
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=26ee5237507419c1fa5dea5b2a84a0b7dcce9307 -X github.com/google/syzkaller/prog.gitRevisionDate=20251119-085940"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=26ee5237507419c1fa5dea5b2a84a0b7dcce9307 -X github.com/google/syzkaller/prog.gitRevisionDate=20251119-085940"  ./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=26ee5237507419c1fa5dea5b2a84a0b7dcce9307 -X github.com/google/syzkaller/prog.gitRevisionDate=20251119-085940"  -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=\"26ee5237507419c1fa5dea5b2a84a0b7dcce9307\"
/usr/bin/ld: /tmp/cchUMbrN.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:         d724c6f8 Add linux-next specific files for 20251121
git tree:       linux-next
kernel config:  https://syzkaller.appspot.com/x/.config?x=68d11c703cf8e4a0
dashboard link: https://syzkaller.appspot.com/bug?extid=2fefb910d2c20c0698d8
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=11883612580000

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