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AJvYcCW4ZMo6pQUf9fHdXWn4eaaYHPNx/b5QdrOz40QuxN1NL9uVKyZZwgLFrnkzoUs8uC3fdkAuus3DXPAIsJw=@vger.kernel.org X-Gm-Message-State: AOJu0YyC5P7DSbaW85l7fOuR0gtQDJ0YciMu81Rnr+aSIgb053AaNJlg 6vssA118qjkqxYepzRxp183NJN53lYPnjkrH54Bq9K7H41npzEcxpXqO57+GI+pNhhnpEmOix3X uxMyl58uQfaKxxLiuvRD0wMx9+1hieSYevteiD3yYmRJFfqyIAfVEGELeH7E= X-Google-Smtp-Source: AGHT+IHWeDI2Znr7kwPhKNBdAK+NULFufZAxsSlTasNm+JX6NhkxJj4Akx6dZrfSuJfeXwJKoACxVHsD+2rolgvEAgxR7mV+85mJ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2227:b0:65b:8574:2e89 with SMTP id 006d021491bc7-65f5508275amr852656eaf.42.1767784443866; Wed, 07 Jan 2026 03:14:03 -0800 (PST) Date: Wed, 07 Jan 2026 03:14:03 -0800 In-Reply-To: <03db8809-0105-4918-b02e-7047d3550fee@kernel.org> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <695e3ffb.050a0220.1c677c.0360.GAE@google.com> Subject: Re: [syzbot] [f2fs?] KASAN: use-after-free Read in f2fs_write_end_io (2) From: syzbot To: chao@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, syzbot tried to test the proposed patch but the build/boot failed: nfigured BSSID 50:50:50:50:50:50 [ 100.257856][ T2781] wlan1: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 101.371932][ T5396] chnl_net:caif_netlink_parms(): no params data found [ 101.453583][ T5396] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 101.457639][ T5396] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 101.460714][ T5396] bridge_slave_0: entered allmulticast mode [ 101.464837][ T5396] bridge_slave_0: entered promiscuous mode [ 101.470155][ T5396] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 101.473256][ T5396] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 101.476836][ T5396] bridge_slave_1: entered allmulticast mode [ 101.481154][ T5396] bridge_slave_1: entered promiscuous mode [ 101.505814][ T5396] bond0: (slave bond_slave_0): Enslaving as an active = interface with an up link [ 101.511793][ T5396] bond0: (slave bond_slave_1): Enslaving as an active = interface with an up link [ 101.536111][ T5396] team0: Port device team_slave_0 added [ 101.540599][ T5396] team0: Port device team_slave_1 added [ 101.560790][ T5396] batman_adv: batadv0: Adding interface: batadv_slave_= 0 [ 101.563830][ T5396] batman_adv: batadv0: The MTU of interface batadv_sla= ve_0 is too small (1500) to handle the transport of batman-adv packets. Pac= kets going over this interface will be fragmented on layer2 which could imp= act the performance. Setting the MTU to 1532 would solve the problem. [ 101.575130][ T5396] batman_adv: batadv0: Not using interface batadv_slav= e_0 (retrying later): interface not active [ 101.581701][ T5396] batman_adv: batadv0: Adding interface: batadv_slave_= 1 [ 101.585906][ T5396] batman_adv: batadv0: The MTU of interface batadv_sla= ve_1 is too small (1500) to handle the transport of batman-adv packets. Pac= kets going over this interface will be fragmented on layer2 which could imp= act the performance. Setting the MTU to 1532 would solve the problem. [ 101.597285][ T5396] batman_adv: batadv0: Not using interface batadv_slav= e_1 (retrying later): interface not active [ 101.636014][ T5396] hsr_slave_0: entered promiscuous mode [ 101.639181][ T5396] hsr_slave_1: entered promiscuous mode [ 101.876756][ T5396] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 101.896280][ T5396] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 101.909331][ T5396] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 101.925590][ T5396] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 101.954391][ T5396] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 101.957643][ T5396] bridge0: port 2(bridge_slave_1) entered forwarding s= tate [ 101.961577][ T5396] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 101.964901][ T5396] bridge0: port 1(bridge_slave_0) entered forwarding s= tate [ 102.021878][ T5396] 8021q: adding VLAN 0 to HW filter on device bond0 [ 102.048170][ T13] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 102.052429][ T13] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 102.070087][ T5396] 8021q: adding VLAN 0 to HW filter on device team0 [ 102.090173][ T925] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 102.093477][ T925] bridge0: port 1(bridge_slave_0) entered forwarding s= tate [ 102.110722][ T925] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 102.114037][ T925] bridge0: port 2(bridge_slave_1) entered forwarding s= tate [ 102.178432][ T5396] hsr0: Slave B (hsr_slave_1) is not up; please bring = it up to get a fully working HSR network [ 102.428330][ T5396] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 102.500294][ T5396] veth0_vlan: entered promiscuous mode [ 102.517479][ T5396] veth1_vlan: entered promiscuous mode [ 102.561025][ T5396] veth0_macvtap: entered promiscuous mode [ 102.577107][ T5396] veth1_macvtap: entered promiscuous mode [ 102.602516][ T5396] batman_adv: batadv0: Interface activated: batadv_sla= ve_0 [ 102.626118][ T5396] batman_adv: batadv0: Interface activated: batadv_sla= ve_1 [ 102.647297][ T2642] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 102.656894][ T2642] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 102.677082][ T2642] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 102.689424][ T2642] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 102.892345][ T2642] netdevsim netdevsim0 netdevsim3 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 102.956394][ T2642] netdevsim netdevsim0 netdevsim2 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 103.026740][ T2642] netdevsim netdevsim0 netdevsim1 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 103.136107][ T2642] netdevsim netdevsim0 netdevsim0 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 2026/01/07 11:13:24 executed programs: 0 [ 104.751420][ T46] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > = 1 [ 104.758077][ T46] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > = 9 [ 104.761677][ T46] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > = 9 [ 104.765876][ T46] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > = 4 [ 104.769685][ T46] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > = 2 [ 104.912412][ T5436] chnl_net:caif_netlink_parms(): no params data found [ 105.001561][ T5436] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 105.005158][ T5436] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 105.008448][ T5436] bridge_slave_0: entered allmulticast mode [ 105.012249][ T5436] bridge_slave_0: entered promiscuous mode [ 105.018886][ T5436] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 105.022146][ T5436] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 105.025711][ T5436] bridge_slave_1: entered allmulticast mode [ 105.029956][ T5436] bridge_slave_1: entered promiscuous mode [ 105.053264][ T5436] bond0: (slave bond_slave_0): Enslaving as an active = interface with an up link [ 105.059670][ T5436] bond0: (slave bond_slave_1): Enslaving as an active = interface with an up link [ 105.108629][ T5436] team0: Port device team_slave_0 added [ 105.126216][ T5436] team0: Port device team_slave_1 added [ 105.161624][ T5436] batman_adv: batadv0: Adding interface: batadv_slave_= 0 [ 105.165010][ T5436] batman_adv: batadv0: The MTU of interface batadv_sla= ve_0 is too small (1500) to handle the transport of batman-adv packets. Pac= kets going over this interface will be fragmented on layer2 which could imp= act the performance. Setting the MTU to 1532 would solve the problem. [ 105.177590][ T5436] batman_adv: batadv0: Not using interface batadv_slav= e_0 (retrying later): interface not active [ 105.183670][ T5436] batman_adv: batadv0: Adding interface: batadv_slave_= 1 [ 105.187495][ T5436] batman_adv: batadv0: The MTU of interface batadv_sla= ve_1 is too small (1500) to handle the transport of batman-adv packets. Pac= kets going over this interface will be fragmented on layer2 which could imp= act the performance. Setting the MTU to 1532 would solve the problem. [ 105.200266][ T5436] batman_adv: batadv0: Not using interface batadv_slav= e_1 (retrying later): interface not active [ 105.275262][ T5436] hsr_slave_0: entered promiscuous mode [ 105.284607][ T5436] hsr_slave_1: entered promiscuous mode [ 105.292649][ T5436] debugfs: 'hsr0' already exists in 'hsr' [ 105.296130][ T5436] Cannot create hsr debugfs directory [ 105.475509][ T2642] bridge_slave_1: left allmulticast mode [ 105.478241][ T2642] bridge_slave_1: left promiscuous mode [ 105.481543][ T2642] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 105.506238][ T2642] bridge_slave_0: left allmulticast mode [ 105.508773][ T2642] bridge_slave_0: left promiscuous mode [ 105.511341][ T2642] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 105.886322][ T2642] bond0 (unregistering): (slave bond_slave_0): Releasi= ng backup interface [ 105.892992][ T2642] bond0 (unregistering): (slave bond_slave_1): Releasi= ng backup interface [ 105.905613][ T2642] bond0 (unregistering): Released all slaves [ 105.999430][ T2642] hsr_slave_0: left promiscuous mode [ 106.004715][ T2642] hsr_slave_1: left promiscuous mode [ 106.014745][ T2642] batman_adv: batadv0: Interface deactivated: batadv_s= lave_0 [ 106.018213][ T2642] batman_adv: batadv0: Removing interface: batadv_slav= e_0 [ 106.033799][ T2642] batman_adv: batadv0: Interface deactivated: batadv_s= lave_1 [ 106.038368][ T2642] batman_adv: batadv0: Removing interface: batadv_slav= e_1 [ 106.061634][ T2642] veth1_macvtap: left promiscuous mode [ 106.071837][ T2642] veth0_macvtap: left promiscuous mode [ 106.084326][ T2642] veth1_vlan: left promiscuous mode [ 106.088805][ T2642] veth0_vlan: left promiscuous mode [ 106.548267][ T2642] team0 (unregistering): Port device team_slave_1 remo= ved [ 106.570601][ T2642] team0 (unregistering): Port device team_slave_0 remo= ved [ 106.855281][ T46] Bluetooth: hci0: command tx timeout [ 107.536913][ T5436] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 107.568089][ T5436] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 107.587709][ T5436] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 107.611328][ T5436] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 107.796353][ T5436] 8021q: adding VLAN 0 to HW filter on device bond0 [ 107.835009][ T5436] 8021q: adding VLAN 0 to HW filter on device team0 [ 107.848925][ T54] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 107.852072][ T54] bridge0: port 1(bridge_slave_0) entered forwarding s= tate [ 107.879697][ T2642] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 107.883224][ T2642] bridge0: port 2(bridge_slave_1) entered forwarding s= tate [ 108.180796][ T5436] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 108.253047][ T5436] veth0_vlan: entered promiscuous mode [ 108.274611][ T5436] veth1_vlan: entered promiscuous mode [ 108.326270][ T5436] veth0_macvtap: entered promiscuous mode [ 108.337072][ T5436] veth1_macvtap: entered promiscuous mode [ 108.369184][ T5436] batman_adv: batadv0: Interface activated: batadv_sla= ve_0 [ 108.385640][ T5436] batman_adv: batadv0: Interface activated: batadv_sla= ve_1 [ 108.420449][ T2781] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 108.436622][ T2781] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 108.443441][ T2781] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 108.477472][ T2781] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 108.552223][ T13] wlan0: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 108.569980][ T13] wlan0: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 108.614658][ T13] wlan1: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 108.618211][ T13] wlan1: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 SYZFAIL: failed to recv rpc fd=3D3 want=3D4 recv=3D0 n=3D0 (errno 9: Bad file descriptor) [ 109.867503][ T13] netdevsim netdevsim0 netdevsim3 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 110.876798][ T13] netdevsim netdevsim0 netdevsim2 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 111.584719][ T13] netdevsim netdevsim0 netdevsim1 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 111.621395][ T13] netdevsim netdevsim0 netdevsim0 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 111.727091][ T13] bridge_slave_1: left allmulticast mode [ 111.729509][ T13] bridge_slave_1: left promiscuous mode [ 111.732075][ T13] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 111.746340][ T13] bridge_slave_0: left allmulticast mode [ 111.748648][ T13] bridge_slave_0: left promiscuous mode [ 111.751051][ T13] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 112.145800][ T13] bond0 (unregistering): (slave bond_slave_0): Releasi= ng backup interface [ 112.153209][ T13] bond0 (unregistering): (slave bond_slave_1): Releasi= ng backup interface [ 112.158719][ T13] bond0 (unregistering): Released all slaves [ 112.365086][ T13] hsr_slave_0: left promiscuous mode [ 112.384247][ T13] hsr_slave_1: left promiscuous mode [ 112.387287][ T13] batman_adv: batadv0: Interface deactivated: batadv_s= lave_0 [ 112.390626][ T13] batman_adv: batadv0: Removing interface: batadv_slav= e_0 [ 112.407206][ T13] batman_adv: batadv0: Interface deactivated: batadv_s= lave_1 [ 112.410705][ T13] batman_adv: batadv0: Removing interface: batadv_slav= e_1 [ 112.432088][ T13] veth1_macvtap: left promiscuous mode [ 112.446121][ T13] veth0_macvtap: left promiscuous mode [ 112.448802][ T13] veth1_vlan: left promiscuous mode [ 112.451149][ T13] veth0_vlan: left promiscuous mode [ 112.840491][ T13] team0 (unregistering): Port device team_slave_1 remo= ved [ 112.867103][ T13] team0 (unregistering): Port device team_slave_0 remo= ved syzkaller build log: go env (err=3D) AR=3D'ar' CC=3D'gcc' CGO_CFLAGS=3D'-O2 -g' CGO_CPPFLAGS=3D'' CGO_CXXFLAGS=3D'-O2 -g' CGO_ENABLED=3D'1' CGO_FFLAGS=3D'-O2 -g' CGO_LDFLAGS=3D'-O2 -g' CXX=3D'g++' GCCGO=3D'gccgo' GO111MODULE=3D'auto' GOAMD64=3D'v1' GOARCH=3D'amd64' GOAUTH=3D'netrc' GOBIN=3D'' GOCACHE=3D'/syzkaller/.cache/go-build' GOCACHEPROG=3D'' GODEBUG=3D'' GOENV=3D'/syzkaller/.config/go/env' GOEXE=3D'' GOEXPERIMENT=3D'' GOFIPS140=3D'off' GOFLAGS=3D'' GOGCCFLAGS=3D'-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=3D0= -ffile-prefix-map=3D/tmp/go-build3375025284=3D/tmp/go-build -gno-record-gc= c-switches' GOHOSTARCH=3D'amd64' GOHOSTOS=3D'linux' GOINSECURE=3D'' GOMOD=3D'/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mo= d' GOMODCACHE=3D'/syzkaller/jobs/linux/gopath/pkg/mod' GONOPROXY=3D'' GONOSUMDB=3D'' GOOS=3D'linux' GOPATH=3D'/syzkaller/jobs/linux/gopath' GOPRIVATE=3D'' GOPROXY=3D'https://proxy.golang.org,direct' GOROOT=3D'/usr/local/go' GOSUMDB=3D'sum.golang.org' GOTELEMETRY=3D'local' GOTELEMETRYDIR=3D'/syzkaller/.config/go/telemetry' GOTMPDIR=3D'' GOTOOLCHAIN=3D'auto' GOTOOLDIR=3D'/usr/local/go/pkg/tool/linux_amd64' GOVCS=3D'' GOVERSION=3D'go1.24.4' GOWORK=3D'' PKG_CONFIG=3D'pkg-config' git status (err=3D) 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/contribut= ing.md#using-syz-env go list -f '{{.Stale}}' -ldflags=3D"-s -w -X github.com/google/syzkaller/pr= og.GitRevision=3Dd1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/goo= gle/syzkaller/prog.gitRevisionDate=3D20251128-125159" ./sys/syz-sysgen | g= rep -q false || go install -ldflags=3D"-s -w -X github.com/google/syzkaller= /prog.GitRevision=3Dd1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/= google/syzkaller/prog.gitRevisionDate=3D20251128-125159" ./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/contribut= ing.md#using-syz-env bin/syz-sysgen touch .descriptions GOOS=3Dlinux GOARCH=3Damd64 go build -ldflags=3D"-s -w -X github.com/google= /syzkaller/prog.GitRevision=3Dd1b870e1003b52891d2196c1e2ee42fe905010ba -X g= ithub.com/google/syzkaller/prog.gitRevisionDate=3D20251128-125159" -o ./bi= n/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 -Wfr= ame-larger-than=3D16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-forma= t-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -= static-pie -std=3Dc++17 -I. -Iexecutor/_include -DGOOS_linux=3D1 -DGOARCH= _amd64=3D1 \ -DHOSTGOOS_linux=3D1 -DGIT_REVISION=3D\"d1b870e1003b52891d2196c1e2ee42fe90= 5010ba\" /usr/bin/ld: /tmp/ccX6FRY7.o: in function `Connection::Connect(char const*,= char const*)': executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEP= KcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applicat= ions requires at runtime the shared libraries from the glibc version used f= or 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=3D1106ef92580000 Tested on: commit: 1860d530 f2fs: fix to avoid UAF in f2fs_write_end_io() git tree: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.= git bugfix/syzbot kernel config: https://syzkaller.appspot.com/x/.config?x=3D513255d80ab78f2= b dashboard link: https://syzkaller.appspot.com/bug?extid=3Db4444e3c972a7a124= 187 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-= 1~exp1~20250708183702.136), Debian LLD 20.1.8 Note: no patches were applied.