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AJvYcCXuLTiy27DpR6uDnYJUlKqJd0+EtmvWk557LLiEO6PeVk3jXsKA2GpIc0nj0oO6rwbWBtXwZ/1oU8QwlUs=@vger.kernel.org X-Gm-Message-State: AOJu0YzPOyuCesgXC+BHqbWmZm5lbgR95H7Tr3eGt7GjsoUpM89s9c1s 6lBIclgsolKGVVFu3Ore/FKK4tnFQYeVettL1zQKO0fuRVqSNAOnWRdmN4cxQOU25jgnUonnfwT LFXvBF7EXxaPpf/6k0GwFVfzzq+g4p6P75OA+5cDzd+vVWF4JyrEr+ZGvL5Q= X-Google-Smtp-Source: AGHT+IEbvpl7BcautGB7qW/o/6oR+fWAmIxCDLlecgnCGYP5Ro4CRDyuXkn6o7m481qbE9vyVmSdSXByXETd81aPBzd8qE9S2Sir Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1795:b0:659:9a49:8f43 with SMTP id 006d021491bc7-65f550cfd68mr668018eaf.84.1767780301618; Wed, 07 Jan 2026 02:05:01 -0800 (PST) Date: Wed, 07 Jan 2026 02:05:01 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <695e2fcd.050a0220.1c677c.035e.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-f2fs-devel@lists.sourceforge.net, 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: 50:50:50 [ 96.324372][ T4608] wlan0: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 96.383532][ T13] wlan1: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 96.388909][ T13] wlan1: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 98.981820][ T4685] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > = 1 [ 98.986155][ T4685] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > = 9 [ 98.989980][ T4685] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > = 9 [ 98.993960][ T4685] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > = 4 [ 98.997492][ T4685] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > = 2 [ 101.080148][ T5400] chnl_net:caif_netlink_parms(): no params data found [ 101.260660][ T5400] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 101.271979][ T5400] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 101.275128][ T5400] bridge_slave_0: entered allmulticast mode [ 101.291786][ T5400] bridge_slave_0: entered promiscuous mode [ 101.298693][ T5400] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 101.309121][ T5400] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 101.312608][ T5400] bridge_slave_1: entered allmulticast mode [ 101.321527][ T5400] bridge_slave_1: entered promiscuous mode [ 101.374348][ T5400] bond0: (slave bond_slave_0): Enslaving as an active = interface with an up link [ 101.394422][ T5400] bond0: (slave bond_slave_1): Enslaving as an active = interface with an up link [ 101.443124][ T5400] team0: Port device team_slave_0 added [ 101.452091][ T5400] team0: Port device team_slave_1 added [ 101.495794][ T5400] batman_adv: batadv0: Adding interface: batadv_slave_= 0 [ 101.498939][ T5400] 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. [ 101.541327][ T5400] batman_adv: batadv0: Not using interface batadv_slav= e_0 (retrying later): interface not active [ 101.571912][ T5400] batman_adv: batadv0: Adding interface: batadv_slave_= 1 [ 101.574976][ T5400] 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. [ 101.611346][ T5400] batman_adv: batadv0: Not using interface batadv_slav= e_1 (retrying later): interface not active [ 101.716466][ T5400] hsr_slave_0: entered promiscuous mode [ 101.720143][ T5400] hsr_slave_1: entered promiscuous mode [ 102.035333][ T5400] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 102.057801][ T5400] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 102.066664][ T5400] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 102.085706][ T5400] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 102.225047][ T5400] 8021q: adding VLAN 0 to HW filter on device bond0 [ 102.254868][ T5400] 8021q: adding VLAN 0 to HW filter on device team0 [ 102.295073][ T1127] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 102.298513][ T1127] bridge0: port 1(bridge_slave_0) entered forwarding s= tate [ 102.313626][ T1127] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 102.316779][ T1127] bridge0: port 2(bridge_slave_1) entered forwarding s= tate [ 102.538955][ T5400] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 102.576951][ T5400] veth0_vlan: entered promiscuous mode [ 102.584258][ T5400] veth1_vlan: entered promiscuous mode [ 102.606836][ T5400] veth0_macvtap: entered promiscuous mode [ 102.617483][ T5400] veth1_macvtap: entered promiscuous mode [ 102.631115][ T5400] batman_adv: batadv0: Interface activated: batadv_sla= ve_0 [ 102.644037][ T5400] batman_adv: batadv0: Interface activated: batadv_sla= ve_1 [ 102.656266][ T4637] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 102.667017][ T4637] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 102.678832][ T4637] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 102.699431][ T4637] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 102.827338][ T4637] netdevsim netdevsim0 netdevsim3 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 102.874563][ T4637] netdevsim netdevsim0 netdevsim2 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 102.916861][ T4637] netdevsim netdevsim0 netdevsim1 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 102.955081][ T4637] netdevsim netdevsim0 netdevsim0 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 2026/01/07 10:04:23 executed programs: 0 [ 103.704543][ T47] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > = 1 [ 103.708655][ T47] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > = 9 [ 103.713035][ T47] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > = 9 [ 103.716711][ T47] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > = 4 [ 103.720706][ T47] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > = 2 [ 103.874928][ T5441] chnl_net:caif_netlink_parms(): no params data found [ 104.002432][ T5441] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 104.005631][ T5441] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 104.009058][ T5441] bridge_slave_0: entered allmulticast mode [ 104.025056][ T5441] bridge_slave_0: entered promiscuous mode [ 104.033625][ T5441] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 104.037020][ T5441] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 104.040130][ T5441] bridge_slave_1: entered allmulticast mode [ 104.053666][ T5441] bridge_slave_1: entered promiscuous mode [ 104.115026][ T5441] bond0: (slave bond_slave_0): Enslaving as an active = interface with an up link [ 104.136512][ T5441] bond0: (slave bond_slave_1): Enslaving as an active = interface with an up link [ 104.178539][ T5441] team0: Port device team_slave_0 added [ 104.183425][ T5441] team0: Port device team_slave_1 added [ 104.207708][ T5441] batman_adv: batadv0: Adding interface: batadv_slave_= 0 [ 104.210805][ T5441] 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. [ 104.223299][ T5441] batman_adv: batadv0: Not using interface batadv_slav= e_0 (retrying later): interface not active [ 104.230664][ T5441] batman_adv: batadv0: Adding interface: batadv_slave_= 1 [ 104.234253][ T5441] 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. [ 104.246544][ T5441] batman_adv: batadv0: Not using interface batadv_slav= e_1 (retrying later): interface not active [ 104.281972][ T5441] hsr_slave_0: entered promiscuous mode [ 104.285329][ T5441] hsr_slave_1: entered promiscuous mode [ 104.288328][ T5441] debugfs: 'hsr0' already exists in 'hsr' [ 104.290838][ T5441] Cannot create hsr debugfs directory [ 105.062924][ T4637] bridge_slave_1: left allmulticast mode [ 105.065283][ T4637] bridge_slave_1: left promiscuous mode [ 105.072635][ T4637] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 105.084121][ T4637] bridge_slave_0: left allmulticast mode [ 105.086616][ T4637] bridge_slave_0: left promiscuous mode [ 105.089229][ T4637] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 105.434250][ T4637] bond0 (unregistering): (slave bond_slave_0): Releasi= ng backup interface [ 105.441979][ T4637] bond0 (unregistering): (slave bond_slave_1): Releasi= ng backup interface [ 105.446733][ T4637] bond0 (unregistering): Released all slaves [ 105.546762][ T4637] hsr_slave_0: left promiscuous mode [ 105.561587][ T4637] hsr_slave_1: left promiscuous mode [ 105.564672][ T4637] batman_adv: batadv0: Interface deactivated: batadv_s= lave_0 [ 105.568054][ T4637] batman_adv: batadv0: Removing interface: batadv_slav= e_0 [ 105.578013][ T4637] batman_adv: batadv0: Interface deactivated: batadv_s= lave_1 [ 105.581111][ T4637] batman_adv: batadv0: Removing interface: batadv_slav= e_1 [ 105.608041][ T4637] veth1_macvtap: left promiscuous mode [ 105.610648][ T4637] veth0_macvtap: left promiscuous mode [ 105.628271][ T4637] veth1_vlan: left promiscuous mode [ 105.632462][ T4637] veth0_vlan: left promiscuous mode [ 105.736315][ T47] Bluetooth: hci0: command tx timeout [ 106.107211][ T4637] team0 (unregistering): Port device team_slave_1 remo= ved [ 106.134290][ T4637] team0 (unregistering): Port device team_slave_0 remo= ved [ 106.578691][ T5441] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 106.599515][ T5441] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 106.616734][ T5441] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 106.630262][ T5441] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 107.173027][ T5441] 8021q: adding VLAN 0 to HW filter on device bond0 [ 107.206957][ T5441] 8021q: adding VLAN 0 to HW filter on device team0 [ 107.255745][ T3440] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 107.259102][ T3440] bridge0: port 1(bridge_slave_0) entered forwarding s= tate [ 107.305836][ T3440] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 107.309126][ T3440] bridge0: port 2(bridge_slave_1) entered forwarding s= tate [ 107.468490][ T5441] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 107.504820][ T5441] veth0_vlan: entered promiscuous mode [ 107.513636][ T5441] veth1_vlan: entered promiscuous mode [ 107.533127][ T5441] veth0_macvtap: entered promiscuous mode [ 107.538225][ T5441] veth1_macvtap: entered promiscuous mode [ 107.551007][ T5441] batman_adv: batadv0: Interface activated: batadv_sla= ve_0 [ 107.563537][ T5441] batman_adv: batadv0: Interface activated: batadv_sla= ve_1 [ 107.573370][ T13] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 107.583446][ T13] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 107.587551][ T13] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 107.620236][ T13] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 107.687153][ T3440] wlan0: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 107.690521][ T3440] wlan0: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 107.739992][ T13] wlan1: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 107.744091][ T13] wlan1: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 107.821622][ T47] Bluetooth: hci0: command tx timeout SYZFAIL: failed to recv rpc fd=3D3 want=3D4 recv=3D0 n=3D0 (errno 9: Bad file descriptor) [ 109.064804][ T3440] netdevsim netdevsim0 netdevsim3 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 110.112799][ T3440] netdevsim netdevsim0 netdevsim2 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 110.530922][ T3440] netdevsim netdevsim0 netdevsim1 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 110.573006][ T3440] netdevsim netdevsim0 netdevsim0 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 110.696901][ T3440] bridge_slave_1: left allmulticast mode [ 110.699371][ T3440] bridge_slave_1: left promiscuous mode [ 110.712675][ T3440] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 110.717544][ T3440] bridge_slave_0: left allmulticast mode [ 110.720008][ T3440] bridge_slave_0: left promiscuous mode [ 110.724098][ T3440] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 111.067299][ T3440] bond0 (unregistering): (slave bond_slave_0): Releasi= ng backup interface [ 111.073241][ T3440] bond0 (unregistering): (slave bond_slave_1): Releasi= ng backup interface [ 111.077962][ T3440] bond0 (unregistering): Released all slaves [ 111.288410][ T3440] hsr_slave_0: left promiscuous mode [ 111.290938][ T3440] hsr_slave_1: left promiscuous mode [ 111.302397][ T3440] batman_adv: batadv0: Interface deactivated: batadv_s= lave_0 [ 111.305777][ T3440] batman_adv: batadv0: Removing interface: batadv_slav= e_0 [ 111.326508][ T3440] batman_adv: batadv0: Interface deactivated: batadv_s= lave_1 [ 111.329929][ T3440] batman_adv: batadv0: Removing interface: batadv_slav= e_1 [ 111.348723][ T3440] veth1_macvtap: left promiscuous mode [ 111.362446][ T3440] veth0_macvtap: left promiscuous mode [ 111.365101][ T3440] veth1_vlan: left promiscuous mode [ 111.367513][ T3440] veth0_vlan: left promiscuous mode [ 111.699085][ T3440] team0 (unregistering): Port device team_slave_1 remo= ved [ 111.720608][ T3440] 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-build1275535676=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/cc4qdZbn.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=3D15dbee9a580000 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.