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Thu, 26 Feb 2026 07:43:04 -0800 (PST) Date: Thu, 26 Feb 2026 07:43:04 -0800 In-Reply-To: <69a06176.050a0220.18f3f1.5d0dSMTPIN_ADDED_MISSING@gmr-mx.google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69a06a08.050a0220.16c224.0003.GAE@google.com> Subject: Re: [syzbot] [media?] KASAN: slab-use-after-free Write in media_request_alloc From: syzbot To: linux-kernel@vger.kernel.org, mfo@igalia.com, 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: 0c03 length: 249 > 1 [ 106.253750][ T4683] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > = 9 [ 106.257543][ T4683] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > = 9 [ 106.268568][ T4683] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > = 4 [ 106.271990][ T4683] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > = 2 [ 106.576059][ T951] wlan1: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 106.580308][ T951] wlan1: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 106.963685][ T5367] syz-executor (5367) used greatest stack depth: 18056= bytes left [ 108.328157][ T4683] Bluetooth: hci0: command tx timeout [ 109.621987][ T5393] chnl_net:caif_netlink_parms(): no params data found [ 109.891390][ T5393] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 109.895644][ T5393] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 109.909027][ T5393] bridge_slave_0: entered allmulticast mode [ 109.919263][ T5393] bridge_slave_0: entered promiscuous mode [ 109.931659][ T5393] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 109.945562][ T5393] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 109.949131][ T5393] bridge_slave_1: entered allmulticast mode [ 109.958653][ T5393] bridge_slave_1: entered promiscuous mode [ 110.046797][ T5393] bond0: (slave bond_slave_0): Enslaving as an active = interface with an up link [ 110.073157][ T5393] bond0: (slave bond_slave_1): Enslaving as an active = interface with an up link [ 110.135915][ T5393] team0: Port device team_slave_0 added [ 110.146251][ T5393] team0: Port device team_slave_1 added [ 110.206774][ T5393] batman_adv: batadv0: Adding interface: batadv_slave_= 0 [ 110.228265][ T5393] 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. [ 110.264469][ T5393] batman_adv: batadv0: Not using interface batadv_slav= e_0 (retrying later): interface not active [ 110.282476][ T5393] batman_adv: batadv0: Adding interface: batadv_slave_= 1 [ 110.285647][ T5393] 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. [ 110.318910][ T5393] batman_adv: batadv0: Not using interface batadv_slav= e_1 (retrying later): interface not active [ 110.384477][ T5393] hsr_slave_0: entered promiscuous mode [ 110.398136][ T4683] Bluetooth: hci0: command tx timeout [ 110.401229][ T5393] hsr_slave_1: entered promiscuous mode [ 110.714539][ T5393] netdevsim netdevsim4 netdevsim0: renamed from eth0 [ 110.750233][ T5393] netdevsim netdevsim4 netdevsim1: renamed from eth1 [ 110.769066][ T5393] netdevsim netdevsim4 netdevsim2: renamed from eth2 [ 110.782144][ T5393] netdevsim netdevsim4 netdevsim3: renamed from eth3 [ 110.922207][ T5393] 8021q: adding VLAN 0 to HW filter on device bond0 [ 110.963107][ T5393] 8021q: adding VLAN 0 to HW filter on device team0 [ 110.980705][ T1043] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 110.983983][ T1043] bridge0: port 1(bridge_slave_0) entered forwarding s= tate [ 111.004797][ T1043] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 111.007951][ T1043] bridge0: port 2(bridge_slave_1) entered forwarding s= tate [ 111.291338][ T5393] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 111.494424][ T5393] veth0_vlan: entered promiscuous mode [ 111.504047][ T5393] veth1_vlan: entered promiscuous mode [ 111.530824][ T5393] veth0_macvtap: entered promiscuous mode [ 111.537212][ T5393] veth1_macvtap: entered promiscuous mode [ 111.553943][ T5393] batman_adv: batadv0: Interface activated: batadv_sla= ve_0 [ 111.566659][ T5393] batman_adv: batadv0: Interface activated: batadv_sla= ve_1 [ 111.577390][ T1043] netdevsim netdevsim4 netdevsim0: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 111.586923][ T1043] netdevsim netdevsim4 netdevsim1: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 111.603357][ T1043] netdevsim netdevsim4 netdevsim2: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 111.608797][ T31] netdevsim netdevsim4 netdevsim3: set [1, 0] type 2 f= amily 0 port 6081 - 0 2026/02/26 15:42:15 executed programs: 0 [ 111.847365][ T46] Bluetooth: hci1: unexpected cc 0x0c03 length: 249 > = 1 [ 111.853330][ T46] Bluetooth: hci1: unexpected cc 0x1003 length: 249 > = 9 [ 111.856528][ T46] Bluetooth: hci1: unexpected cc 0x1001 length: 249 > = 9 [ 111.860446][ T46] Bluetooth: hci1: unexpected cc 0x0c23 length: 249 > = 4 [ 111.863901][ T46] Bluetooth: hci1: unexpected cc 0x0c38 length: 249 > = 2 [ 112.198358][ T5455] chnl_net:caif_netlink_parms(): no params data found [ 112.267661][ T5455] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 112.271489][ T5455] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 112.274573][ T5455] bridge_slave_0: entered allmulticast mode [ 112.279376][ T5455] bridge_slave_0: entered promiscuous mode [ 112.283631][ T5455] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 112.286737][ T5455] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 112.290395][ T5455] bridge_slave_1: entered allmulticast mode [ 112.294412][ T5455] bridge_slave_1: entered promiscuous mode [ 112.316604][ T5455] bond0: (slave bond_slave_0): Enslaving as an active = interface with an up link [ 112.341890][ T5455] bond0: (slave bond_slave_1): Enslaving as an active = interface with an up link [ 112.393270][ T5455] team0: Port device team_slave_0 added [ 112.409121][ T5455] team0: Port device team_slave_1 added [ 112.458152][ T5455] batman_adv: batadv0: Adding interface: batadv_slave_= 0 [ 112.461130][ T5455] 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. [ 112.478873][ T46] Bluetooth: hci0: command tx timeout [ 112.488075][ T5455] batman_adv: batadv0: Not using interface batadv_slav= e_0 (retrying later): interface not active [ 112.499491][ T5455] batman_adv: batadv0: Adding interface: batadv_slave_= 1 [ 112.502401][ T5455] 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. [ 112.529001][ T5455] batman_adv: batadv0: Not using interface batadv_slav= e_1 (retrying later): interface not active [ 112.605799][ T5455] hsr_slave_0: entered promiscuous mode [ 112.609713][ T5455] hsr_slave_1: entered promiscuous mode [ 112.612785][ T5455] debugfs: 'hsr0' already exists in 'hsr' [ 112.615353][ T5455] Cannot create hsr debugfs directory [ 112.771926][ T5455] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 112.783380][ T5455] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 112.791273][ T5455] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 112.797627][ T5455] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 112.875456][ T5455] 8021q: adding VLAN 0 to HW filter on device bond0 [ 112.896056][ T5455] 8021q: adding VLAN 0 to HW filter on device team0 [ 112.904713][ T3999] bridge0: port 1(bridge_slave_0) entered blocking sta= te [ 112.908134][ T3999] bridge0: port 1(bridge_slave_0) entered forwarding s= tate [ 112.919758][ T951] bridge0: port 2(bridge_slave_1) entered blocking sta= te [ 112.923095][ T951] bridge0: port 2(bridge_slave_1) entered forwarding s= tate [ 113.112452][ T5455] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 113.155690][ T5455] veth0_vlan: entered promiscuous mode [ 113.164569][ T5455] veth1_vlan: entered promiscuous mode [ 113.190733][ T5455] veth0_macvtap: entered promiscuous mode [ 113.197471][ T5455] veth1_macvtap: entered promiscuous mode [ 113.215022][ T5455] batman_adv: batadv0: Interface activated: batadv_sla= ve_0 [ 113.226089][ T5455] batman_adv: batadv0: Interface activated: batadv_sla= ve_1 [ 113.234855][ T31] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 113.244504][ T31] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 113.255609][ T31] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 113.292821][ T31] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 f= amily 0 port 6081 - 0 [ 113.359090][ T951] wlan0: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 113.362546][ T951] wlan0: Creating new IBSS network, BSSID 50:50:50:50:= 50:50 [ 113.429892][ T31] wlan1: Created IBSS using preconfigured BSSID 50:50:= 50:50:50:50 [ 113.433619][ T31] 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) [ 114.122967][ T1043] netdevsim netdevsim4 netdevsim3 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 114.429752][ T1043] netdevsim netdevsim4 netdevsim2 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 114.483912][ T1043] netdevsim netdevsim4 netdevsim1 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 114.549421][ T1043] netdevsim netdevsim4 netdevsim0 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 114.761462][ T1043] bridge_slave_1: left allmulticast mode [ 114.764161][ T1043] bridge_slave_1: left promiscuous mode [ 114.767497][ T1043] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 114.802242][ T1043] bridge_slave_0: left allmulticast mode [ 114.804855][ T1043] bridge_slave_0: left promiscuous mode [ 114.807653][ T1043] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 115.196541][ T1043] bond0 (unregistering): (slave bond_slave_0): Releasi= ng backup interface [ 115.203611][ T1043] bond0 (unregistering): (slave bond_slave_1): Releasi= ng backup interface [ 115.210418][ T1043] bond0 (unregistering): Released all slaves [ 115.367021][ T1043] hsr_slave_0: left promiscuous mode [ 115.388260][ T1043] hsr_slave_1: left promiscuous mode [ 115.391568][ T1043] batman_adv: batadv0: Interface deactivated: batadv_s= lave_0 [ 115.394769][ T1043] batman_adv: batadv0: Removing interface: batadv_slav= e_0 [ 115.413510][ T1043] batman_adv: batadv0: Interface deactivated: batadv_s= lave_1 [ 115.416877][ T1043] batman_adv: batadv0: Removing interface: batadv_slav= e_1 [ 115.453664][ T1043] veth1_macvtap: left promiscuous mode [ 115.456467][ T1043] veth0_macvtap: left promiscuous mode [ 115.464776][ T1043] veth1_vlan: left promiscuous mode [ 115.466936][ T1043] veth0_vlan: left promiscuous mode [ 115.943578][ T1043] team0 (unregistering): Port device team_slave_1 remo= ved [ 115.984498][ T1043] team0 (unregistering): Port device team_slave_0 remo= ved [ 116.563465][ T1043] netdevsim netdevsim0 netdevsim3 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 116.715509][ T1043] netdevsim netdevsim0 netdevsim2 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 116.787744][ T1043] netdevsim netdevsim0 netdevsim1 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 116.860315][ T1043] netdevsim netdevsim0 netdevsim0 (unregistering): uns= et [1, 0] type 2 family 0 port 6081 - 0 [ 117.037674][ T1043] bridge_slave_1: left allmulticast mode [ 117.051515][ T1043] bridge_slave_1: left promiscuous mode [ 117.054331][ T1043] bridge0: port 2(bridge_slave_1) entered disabled sta= te [ 117.070719][ T1043] bridge_slave_0: left allmulticast mode [ 117.073222][ T1043] bridge_slave_0: left promiscuous mode [ 117.075883][ T1043] bridge0: port 1(bridge_slave_0) entered disabled sta= te [ 117.470534][ T1043] bond0 (unregistering): (slave bond_slave_0): Releasi= ng backup interface [ 117.476031][ T1043] bond0 (unregistering): (slave bond_slave_1): Releasi= ng backup interface [ 117.483636][ T1043] bond0 (unregistering): Released all slaves [ 117.741781][ T1043] hsr_slave_0: left promiscuous mode [ 117.744650][ T1043] hsr_slave_1: left promiscuous mode [ 117.747513][ T1043] batman_adv: batadv0: Interface deactivated: batadv_s= lave_0 [ 117.762774][ T1043] batman_adv: batadv0: Removing interface: batadv_slav= e_0 [ 117.778823][ T1043] batman_adv: batadv0: Interface deactivated: batadv_s= lave_1 [ 117.782013][ T1043] batman_adv: batadv0: Removing interface: batadv_slav= e_1 [ 117.792752][ T1043] veth1_macvtap: left promiscuous mode [ 117.795248][ T1043] veth0_macvtap: left promiscuous mode [ 117.797711][ T1043] veth1_vlan: left promiscuous mode [ 117.818197][ T1043] veth0_vlan: left promiscuous mode [ 118.255958][ T1043] team0 (unregistering): Port device team_slave_1 remo= ved [ 118.280291][ T1043] 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-build3231907968=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/cczH2ZJp.o: in function `Connection::Connect(char const*,= char const*)': executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEP= KcS1_]+0x386): 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=3D1721a006580000 Tested on: commit: a260bd22 media: mc: fix potential use-after-free in me.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linu= x.git kernel config: https://syzkaller.appspot.com/x/.config?x=3D42a29b5eebe67b1= 7 dashboard link: https://syzkaller.appspot.com/bug?extid=3D2bf29e42be0666f2d= f70 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-= 1~exp1~20251221153213.50), Debian LLD 21.1.8 Note: no patches were applied.