ci2 starts bisection 2026-10-25 17:07:11.607371278 +0000 UTC m=+167093.864635991 bisecting fixing commit since c5596480c50e081668ff170e80db6314a033be11 building syzkaller on 492bab153dea5e0e414bd0bbf60c3871267255ed ensuring issue is reproducible on original commit c5596480c50e081668ff170e80db6314a033be11 testing commit c5596480c50e081668ff170e80db6314a033be11 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: c2bfba6dcecc009a0313b115d5d0e84ad2bc9844d0c7486142b62bdd67657b03 all runs: crashed: general protection fault in f_midi2_stop_eps representative crash: general protection fault in f_midi2_stop_eps, types: [DoS] check whether we can drop unnecessary instrumentation disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit c5596480c50e081668ff170e80db6314a033be11 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 983846f2764c366daa5a98fb659859f2630c4119607de3ca0d3161f98b7c91d5 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] the bug reproduces without the instrumentation disabling configs for [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed kconfig minimization: base=3916 full=7804 leaves diff=2160 split chunks (needed=false): <2160> split chunk #0 of len 2160 into 5 parts testing without sub-chunk 1/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit c5596480c50e081668ff170e80db6314a033be11 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 4413b02e46cd88de192f5269d701550e935f9da347afa92e5fa188eb40b8533a all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed testing commit c5596480c50e081668ff170e80db6314a033be11 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 344b5bcfa3e39bd50cf53fa4df3786ab060355caa4134f212e2914ee142185bd all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit c5596480c50e081668ff170e80db6314a033be11 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: d3f6aba20b39d51a940997e2535710a13fe1e3b7398cd9d9167b2b0446093856 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit c5596480c50e081668ff170e80db6314a033be11 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 58feaf272a224d7545608b3eab3e8202a4579f6361230a625a76de0c0109d824 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed testing commit c5596480c50e081668ff170e80db6314a033be11 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 failed building c5596480c50e081668ff170e80db6314a033be11: ld.lld: error: undefined symbol: devm_drm_of_get_bridge minimized to 864 configs; suspects: [AF_RXRPC ARCH_ENABLE_MEMORY_HOTREMOVE ATM AX25 BCMA BLK_DEV_ZONED BPF_SYSCALL BT BT_BREDR BT_HIDP BXT_WC_PMIC_OPREGION CARDBUS CFG80211 CFG80211_WEXT CMA COMMON_CLK CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DAX DLM DRM DVB_CORE ENCRYPTED_KEYS EXTCON FB GENEVE GPIOLIB HAMRADIO HAVE_CLK HID_NINTENDO HID_NVIDIA_SHIELD HID_PLAYSTATION HID_SENSOR_HUB HID_SMARTJOYPLUS HID_STEAM HID_THRUSTMASTER HID_ZEROPLUS I2C_MUX IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_IPOIB INFINIBAND_USER_ACCESS INFINIBAND_VIRT_DMA INPUT_TABLET INPUT_TOUCHSCREEN INTEL_SCU_IPC INTEL_SOC_PMIC_BXTWC IOMMUFD IP_SCTP IRQ_REMAP KVM KVM_INTEL L2TP LEDS_CLASS_MULTICOLOR LIBNVDIMM MAC80211 MEDIA_ANALOG_TV_SUPPORT MEDIA_CAMERA_SUPPORT MEDIA_CEC_SUPPORT MEDIA_COMMON_OPTIONS MEDIA_CONTROLLER MEDIA_DIGITAL_TV_SUPPORT MEDIA_PLATFORM_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_TEST_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MFD_INTEL_PMC_BXT MFD_MT6360 MFD_MT6370 MFD_RETU MFD_VIPERBOARD MMC MTD MTD_UBI NETFILTER_ADVANCED NETFILTER_CONNCOUNT NET_IPGRE NET_IPGRE_DEMUX NFS_V4_1 NF_CONNTRACK_SNMP NF_CT_PROTO_UDPLITE NF_DUP_IPV4 NF_DUP_IPV6 NF_DUP_NETDEV NF_FLOW_TABLE NF_FLOW_TABLE_INET NF_NAT_AMANDA NF_NAT_H323 NF_NAT_OVS NF_NAT_PPTP NF_NAT_REDIRECT NF_NAT_SNMP_BASIC NF_NAT_TFTP NF_SOCKET_IPV4 NF_SOCKET_IPV6 NF_TABLES NF_TABLES_ARP NF_TABLES_NETDEV NF_TPROXY_IPV4 NF_TPROXY_IPV6 NILFS2_FS NINTENDO_FF NLMON NLS_CODEPAGE_1250 NLS_CODEPAGE_1251 NLS_CODEPAGE_737 NLS_CODEPAGE_775 NLS_CODEPAGE_850 NLS_CODEPAGE_852 NLS_CODEPAGE_855 NLS_CODEPAGE_857 NLS_CODEPAGE_860 NLS_CODEPAGE_861 NLS_CODEPAGE_862 NLS_CODEPAGE_863 NLS_CODEPAGE_864 NLS_CODEPAGE_865 NLS_CODEPAGE_866 NLS_CODEPAGE_869 NLS_CODEPAGE_874 NLS_CODEPAGE_932 NLS_CODEPAGE_936 NLS_CODEPAGE_949 NLS_CODEPAGE_950 NLS_ISO8859_13 NLS_ISO8859_14 NLS_ISO8859_15 NLS_ISO8859_2 NLS_ISO8859_3 NLS_ISO8859_4 NLS_ISO8859_5 NLS_ISO8859_6 NLS_ISO8859_7 NLS_ISO8859_8 NLS_ISO8859_9 NLS_KOI8_R NLS_KOI8_U NLS_MAC_CELTIC NLS_MAC_CENTEURO NLS_MAC_CROATIAN NLS_MAC_CYRILLIC NLS_MAC_GAELIC NLS_MAC_GREEK NLS_MAC_ICELAND NLS_MAC_INUIT NLS_MAC_ROMAN NLS_MAC_ROMANIAN NLS_MAC_TURKISH NLS_UCS2_UTILS NOP_USB_XCEIV NOZOMI NTFS3_FS NTFS3_FS_POSIX_ACL NTFS3_LZX_XPRESS NTFS_FS NTFS_RW NULL_TTY NUMA_BALANCING NUMA_BALANCING_DEFAULT_ENABLED NUMA_EMU NUMA_KEEP_MEMINFO NVDIMM_DAX NVDIMM_KEYS NVDIMM_PFN NVIDIA_SHIELD_FF NVME_CORE NVME_FABRICS NVME_FC NVME_MULTIPATH NVME_RDMA NVME_TARGET NVME_TARGET_FC NVME_TARGET_FCLOOP NVME_TARGET_LOOP NVME_TARGET_RDMA NVME_TARGET_TCP NVME_TCP N_GSM N_HDLC OCFS2_DEBUG_FS OCFS2_FS OCFS2_FS_O2CB OCFS2_FS_STATS OCFS2_FS_USERSPACE_CLUSTER OF_GPIO OF_PMEM OMFS_FS OPENVSWITCH OPENVSWITCH_GENEVE OPENVSWITCH_GRE OPENVSWITCH_VXLAN ORANGEFS_FS OSF_PARTITION OVERLAY_FS OVERLAY_FS_DEBUG OVERLAY_FS_INDEX OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW OVERLAY_FS_REDIRECT_DIR PACKET_DIAG PADATA PAGE_IDLE_FLAG PAGE_POOL PAGE_REPORTING PARPORT PARPORT_NOT_PC PARTITION_ADVANCED PCCARD PCCARD_NONSTATIC PCIEAER PCI_ENDPOINT PCI_IOV PCMCIA PCMCIA_LOAD_CIS PERCPU_STATS PERSISTENT_KEYRINGS PHONET PHYLINK PHY_CPCAP_USB PHY_QCOM_USB_HS PHY_QCOM_USB_HSIC PHY_SAMSUNG_USB2 PHY_TUSB1210 PKCS7_TEST_KEY PKCS8_PRIVATE_KEY_PARSER PLAYSTATION_FF PLFXLC PMIC_OPREGION PM_CLK PNFS_BLOCK PNFS_FILE_LAYOUT PNFS_FLEXFILE_LAYOUT PPP PPPOATM PPPOE PPPOE_HASH_BITS_4 PPPOL2TP PPP_ASYNC PPP_BSDCOMP PPP_DEFLATE PPP_FILTER PPP_MPPE PPP_MULTILINK PPP_SYNC_TTY PPTP PREEMPT PREEMPT_NOTIFIERS PRISM2_USB PROC_CHILDREN PSI PSTORE PSTORE_COMPRESS QCOM_QMI_HELPERS QNX4FS_FS QNX6FS_FS QRTR QRTR_TUN RADIO_ADAPTERS RADIO_SHARK RADIO_SHARK2 RADIO_SI470X RADIO_SI4713 RADIO_TEA575X RAID6_PQ RAID_ATTRS RC_ATI_REMOTE RC_CORE RC_DEVICES RC_XBOX_DVD RDMA_RXE RDMA_SIW RDS RDS_RDMA RDS_TCP READ_ONLY_THP_FOR_FS REALTEK_AUTOPM REED_SOLOMON 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USB_NET_CX82310_ETH USB_NET_DM9601 USB_NET_GL620A USB_NET_HUAWEI_CDC_NCM USB_NET_INT51X1 USB_NET_KALMIA USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_QMI_WWAN USB_NET_RNDIS_HOST USB_NET_RNDIS_WLAN USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_OXU210HP_HCD USB_PEGASUS USB_PULSE8_CEC USB_PWC USB_PWC_INPUT_EVDEV USB_PXA27X USB_R8A66597 USB_R8A66597_HCD USB_RAINSHADOW_CEC USB_RAREMONO USB_RAW_GADGET USB_ROLE_SWITCH USB_RTL8150 USB_RTL8152 USB_RTL8153_ECM USB_S2255 USB_SERIAL USB_SERIAL_AIRCABLE USB_SERIAL_ARK3116 USB_SERIAL_BELKIN USB_SERIAL_CH341 USB_SERIAL_CONSOLE USB_SERIAL_CP210X USB_SERIAL_CYBERJACK USB_SERIAL_CYPRESS_M8 USB_SERIAL_DEBUG USB_SERIAL_DIGI_ACCELEPORT USB_SERIAL_EDGEPORT USB_SERIAL_EDGEPORT_TI USB_SERIAL_EMPEG USB_SERIAL_F81232 USB_SERIAL_F8153X USB_SERIAL_FTDI_SIO USB_SERIAL_GARMIN USB_SERIAL_GENERIC USB_SERIAL_IPAQ USB_SERIAL_IPW USB_SERIAL_IR USB_SERIAL_IUU USB_SERIAL_KEYSPAN USB_SERIAL_KEYSPAN_PDA USB_SERIAL_KLSI USB_SERIAL_KOBIL_SCT USB_SERIAL_MCT_U232 USB_SERIAL_METRO USB_SERIAL_MOS7715_PARPORT USB_SERIAL_MOS7720 USB_SERIAL_MOS7840 USB_SERIAL_MXUPORT USB_SERIAL_NAVMAN USB_SERIAL_OMNINET USB_SERIAL_OPTICON USB_SERIAL_OPTION USB_SERIAL_OTI6858 USB_SERIAL_PL2303 USB_SERIAL_QCAUX USB_SERIAL_QT2 USB_SERIAL_QUALCOMM USB_SERIAL_SAFE USB_SERIAL_SIERRAWIRELESS USB_SERIAL_SIMPLE USB_SERIAL_SPCP8X5 USB_SERIAL_SSU100 USB_SERIAL_SYMBOL USB_SERIAL_TI USB_SERIAL_UPD78F0730 USB_SERIAL_VISOR USB_SERIAL_WHITEHEAT USB_SERIAL_WISHBONE USB_SERIAL_WWAN USB_SERIAL_XR USB_SERIAL_XSENS_MT USB_SEVSEG USB_SI470X USB_SI4713 USB_SIERRA_NET USB_SISUSBVGA USB_SL811_CS USB_SL811_HCD USB_SL811_HCD_ISO USB_SNP_CORE USB_SPEEDTOUCH USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_ENE_UB6250 USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_REALTEK USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_STV06XX USB_TEST USB_TMC USB_TRANCEVIBRATOR USB_UAS USB_UEAGLEATM USB_ULPI_BUS USB_USBNET USB_USS720 USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_VIDEO_CLASS USB_VIDEO_CLASS_INPUT_EVDEV USB_VL600 USB_WDM USB_XHCI_DBGCAP USB_XHCI_PCI_RENESAS USB_XHCI_PLATFORM USB_XUSBATM USB_YUREX USERFAULTFD USERIO USER_RETURN_NOTIFIER UVC_COMMON U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VDPA_SIM VDPA_SIM_BLOCK VDPA_SIM_NET VDPA_USER VETH VFIO VFIO_DEVICE_CDEV VFIO_PCI VFIO_PCI_CORE VFIO_PCI_INTX VFIO_PCI_MMAP VFIO_VIRQFD VGASTATE VHOST VHOST_CROSS_ENDIAN_LEGACY VHOST_IOTLB VHOST_NET VHOST_RING VHOST_TASK VHOST_VDPA VHOST_VSOCK VIDEOBUF2_CORE VIDEOBUF2_DMA_CONTIG VIDEOBUF2_DMA_SG VIDEOBUF2_MEMOPS VIDEOBUF2_V4L2 VIDEOBUF2_VMALLOC VIDEOMODE_HELPERS VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CMDLINE VIDEO_CS53L32A VIDEO_CX231XX VIDEO_CX231XX_ALSA VIDEO_CX231XX_DVB VIDEO_CX231XX_RC VIDEO_CX2341X VIDEO_CX25840 VIDEO_DEV VIDEO_EM28XX VIDEO_EM28XX_ALSA VIDEO_EM28XX_DVB VIDEO_EM28XX_RC VIDEO_EM28XX_V4L2 VIDEO_GO7007 VIDEO_GO7007_LOADER VIDEO_GO7007_USB VIDEO_GO7007_USB_S2250_BOARD VIDEO_HDPVR VIDEO_MSP3400 VIDEO_NOMODESET VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS VXLAN WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK WLAN_VENDOR_PURELIFI WLAN_VENDOR_SILABS X86_SGX X86_SGX_KVM X86_USER_SHADOW_STACK X86_X2APIC XARRAY_MULTI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_DRAIN_INTENTS XFS_FS XFS_ONLINE_REPAIR XFS_ONLINE_SCRUB XFS_POSIX_ACL XFS_QUOTA XFS_RT XILLYBUS_CLASS XILLYUSB XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZBUD ZEROPLUS_FF ZLIB_DEFLATE ZONEFS_FS ZONE_DEVICE ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZBUD] disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing current HEAD 0aebf2870d53a8d97e02a99e2103ea0b38950c1b testing commit 0aebf2870d53a8d97e02a99e2103ea0b38950c1b gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: b884d32eded7589d2f6ee0563e9701c2c300acac155ac6264ea23e1e51e500b3 all runs: OK false negative chance: 0.000 # git bisect start 0aebf2870d53a8d97e02a99e2103ea0b38950c1b c5596480c50e081668ff170e80db6314a033be11 Bisecting: 2739 revisions left to test after this (roughly 12 steps) [517c353e5358b2123cbf620a1798fe632fb7bdce] usbip: vhci_hcd: fix NULL deref in status_show_vhci determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit 517c353e5358b2123cbf620a1798fe632fb7bdce gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: feb289cbebf33fe7516af80bc5477a69d23d0a9067d60489e4377118ffb8eb24 all runs: OK false negative chance: 0.000 # git bisect bad 517c353e5358b2123cbf620a1798fe632fb7bdce Bisecting: 1368 revisions left to test after this (roughly 11 steps) [c3457a5aae5fb43f7023d3f3dc472c2afa22acf0] ip6_gre: fix hardware header length for NBMA tunnels determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 933b66cb161e6c84bf127a4ee4d625e705abfa4d6a68cfa62560701cf1a62c24 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] # git bisect good c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 Bisecting: 684 revisions left to test after this (roughly 10 steps) [1a1dea633b724a1c042dbcdb1fed27f410916688] ext4: fix out-of-bounds read in ext4_read_inline_dir() determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit 1a1dea633b724a1c042dbcdb1fed27f410916688 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 failed building 1a1dea633b724a1c042dbcdb1fed27f410916688: ld.lld: error: undefined symbol: irq_domain_alloc_generic_chips ld.lld: error: undefined symbol: irq_domain_remove_generic_chips # git bisect skip 1a1dea633b724a1c042dbcdb1fed27f410916688 Bisecting: 684 revisions left to test after this (roughly 10 steps) [a4adaa722977f46511d4247172cd4ec991b80ff2] ocfs2: always run deallocs on copy-on-write completion determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit a4adaa722977f46511d4247172cd4ec991b80ff2 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 6e19b75837c238e21766f1bac7e91923e16fddd7689de5eba2c4770a12d29a76 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] # git bisect good a4adaa722977f46511d4247172cd4ec991b80ff2 Bisecting: 664 revisions left to test after this (roughly 9 steps) [20068f9cce6d4f9d85c2b0087601ea49ad0f5962] iommu/qcom: Fix inverted fault report check in qcom_iommu_fault() determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit 20068f9cce6d4f9d85c2b0087601ea49ad0f5962 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 failed building 20068f9cce6d4f9d85c2b0087601ea49ad0f5962: ld.lld: error: undefined symbol: irq_domain_alloc_generic_chips ld.lld: error: undefined symbol: irq_domain_remove_generic_chips # git bisect skip 20068f9cce6d4f9d85c2b0087601ea49ad0f5962 Bisecting: 664 revisions left to test after this (roughly 9 steps) [827d1eebd5f24101de5984cecdf6db167db982be] bridge: Do not suppress ARP probes and DAD NS unconditionally determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit 827d1eebd5f24101de5984cecdf6db167db982be gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 5246b5b5317fb230673873fcc1b0bd9ecd16fa307d57b5a9dff0613e6703d3d5 all runs: OK false negative chance: 0.000 # git bisect bad 827d1eebd5f24101de5984cecdf6db167db982be Bisecting: 628 revisions left to test after this (roughly 9 steps) [075de95d7a7cd8fecfb6fe1c685c9064fc6c9d76] dmaengine: dw-edma: Serialize abort state updates determine whether the revision contains the guilty commit revision c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 crashed and is reachable testing commit 075de95d7a7cd8fecfb6fe1c685c9064fc6c9d76 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 failed building 075de95d7a7cd8fecfb6fe1c685c9064fc6c9d76: ld.lld: error: undefined symbol: irq_domain_alloc_generic_chips ld.lld: error: undefined symbol: irq_domain_remove_generic_chips # git bisect skip 075de95d7a7cd8fecfb6fe1c685c9064fc6c9d76 Bisecting: 628 revisions left to test after this (roughly 9 steps) [bfb1c9e6297b4c0c2109291e9c6e93c573306152] net: fix spurious TX timeout after dev_activate() determine whether the revision contains the guilty commit revision c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 crashed and is reachable testing commit bfb1c9e6297b4c0c2109291e9c6e93c573306152 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 787c9dd06d6a6c6e138d03ea8851d978d91ad930526cb5002b7a8c42f58ca463 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] # git bisect good bfb1c9e6297b4c0c2109291e9c6e93c573306152 Bisecting: 581 revisions left to test after this (roughly 9 steps) [74637f7fef030e5fb2e835b7dfeb05efdc48e0fe] ext4: fix buffer_head leak in ext4_init_orphan_info determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit 74637f7fef030e5fb2e835b7dfeb05efdc48e0fe gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 failed building 74637f7fef030e5fb2e835b7dfeb05efdc48e0fe: ld.lld: error: undefined symbol: irq_domain_alloc_generic_chips ld.lld: error: undefined symbol: irq_domain_remove_generic_chips # git bisect skip 74637f7fef030e5fb2e835b7dfeb05efdc48e0fe Bisecting: 581 revisions left to test after this (roughly 9 steps) [123d67513c8284f50c6ca3bf28b371576040be3f] selftests/bpf: Fix incorrect error checking for pthread_create determine whether the revision contains the guilty commit revision c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 crashed and is reachable testing commit 123d67513c8284f50c6ca3bf28b371576040be3f gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 failed building 123d67513c8284f50c6ca3bf28b371576040be3f: ld.lld: error: undefined symbol: irq_domain_alloc_generic_chips ld.lld: error: undefined symbol: irq_domain_remove_generic_chips # git bisect skip 123d67513c8284f50c6ca3bf28b371576040be3f Bisecting: 581 revisions left to test after this (roughly 9 steps) [a223216745ed46db152bf2dde8e5a4c24d2a7523] perf test: Fix perf stat --bpf-counters on hybrid machines determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit a223216745ed46db152bf2dde8e5a4c24d2a7523 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: b9ba9c346e66f26a47d90b56704ecf668969a9f184af63004c8b0be59fb004cd all runs: OK false negative chance: 0.000 # git bisect bad a223216745ed46db152bf2dde8e5a4c24d2a7523 Bisecting: 165 revisions left to test after this (roughly 7 steps) [ff40e597d5d98c0c45a4d09df8177202fac9520e] LoongArch: Avoid preempt count underflow without probe determine whether the revision contains the guilty commit revision bfb1c9e6297b4c0c2109291e9c6e93c573306152 crashed and is reachable testing commit ff40e597d5d98c0c45a4d09df8177202fac9520e gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: af2ff88061a596881671701e577eec5fe925d7a5bdd32d2c60e25f16ccca2820 all runs: OK false negative chance: 0.000 # git bisect bad ff40e597d5d98c0c45a4d09df8177202fac9520e Bisecting: 82 revisions left to test after this (roughly 6 steps) [17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba] dmaengine: dw-edma: Initialize IRQ data before requesting IRQs determine whether the revision contains the guilty commit revision c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 crashed and is reachable testing commit 17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: b3879952bda4931b51844073d1e184c50322c963436ba73d14371999689b0e3c all runs: OK false negative chance: 0.000 # git bisect bad 17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba Bisecting: 41 revisions left to test after this (roughly 5 steps) [343ae18e960f6c5f1d34d58a69750c62cd463228] fsnotify: Fix stale object mask after concurrent mark updates determine whether the revision contains the guilty commit revision bfb1c9e6297b4c0c2109291e9c6e93c573306152 crashed and is reachable testing commit 343ae18e960f6c5f1d34d58a69750c62cd463228 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 9ad88dd2688da7cbe0d4b8bf0ff5dcc9b1dba547ee8ca3d03152674a64c656c1 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] # git bisect good 343ae18e960f6c5f1d34d58a69750c62cd463228 Bisecting: 20 revisions left to test after this (roughly 4 steps) [0b7f64c7bb9664777168768c6b44affb07dcbf24] staging: rtl8723bs: fix OOB read in rtw_action_frame_parse() determine whether the revision contains the guilty commit revision a4adaa722977f46511d4247172cd4ec991b80ff2 crashed and is reachable testing commit 0b7f64c7bb9664777168768c6b44affb07dcbf24 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: bc308c8aba300af9e9d9e47ce5a891813a8966ee03c032c0f83f992380774fab run #0: infra problem: failed to create instance: googleapi: Error 503: The service is currently unavailable., backendError run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK false negative chance: 0.000 # git bisect bad 0b7f64c7bb9664777168768c6b44affb07dcbf24 Bisecting: 9 revisions left to test after this (roughly 3 steps) [67374e3a00814dcdd46e9feca61f69f7f2d81957] media: usbtv: keep device alive while ALSA card exists determine whether the revision contains the guilty commit revision bfb1c9e6297b4c0c2109291e9c6e93c573306152 crashed and is reachable testing commit 67374e3a00814dcdd46e9feca61f69f7f2d81957 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 57a04acd885bde30273a0b39e5288f948ef55977fddc1dfee01dbd30712facf5 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] # git bisect good 67374e3a00814dcdd46e9feca61f69f7f2d81957 Bisecting: 4 revisions left to test after this (roughly 2 steps) [51ddc55c75087ac25342f6d73d3aeaf14f59bd76] usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs determine whether the revision contains the guilty commit revision bfb1c9e6297b4c0c2109291e9c6e93c573306152 crashed and is reachable testing commit 51ddc55c75087ac25342f6d73d3aeaf14f59bd76 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 1a72887e4d33509121b4aeacc5f1e89197434e51a3f81160a595884104e85518 all runs: OK false negative chance: 0.000 # git bisect bad 51ddc55c75087ac25342f6d73d3aeaf14f59bd76 Bisecting: 1 revision left to test after this (roughly 1 step) [0b69b166852dbf1f9532b22bd49f502e5970eb95] usb: typec: qcom-pmic: cancel reset_work on stop determine whether the revision contains the guilty commit revision a4adaa722977f46511d4247172cd4ec991b80ff2 crashed and is reachable testing commit 0b69b166852dbf1f9532b22bd49f502e5970eb95 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 9d9f575e4af32e728f666c8083165a985891bd49cd30ec181459fd2e091f1921 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] # git bisect good 0b69b166852dbf1f9532b22bd49f502e5970eb95 Bisecting: 0 revisions left to test after this (roughly 0 steps) [58e0ee293ec5e06cacbe3953ad44042f1473dae9] usb: typec: ucsi: displayport: Fix OOB altmode array index determine whether the revision contains the guilty commit revision c5596480c50e081668ff170e80db6314a033be11 crashed and is reachable testing commit 58e0ee293ec5e06cacbe3953ad44042f1473dae9 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: a4ec744a7c8997818f4570f65db88e076b4b1347d6856c44f76ee8ae0a7843f5 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps representative crash: BUG: unable to handle kernel NULL pointer dereference in f_midi2_stop_eps, types: [NULL-POINTER-DEREFERENCE] # git bisect good 58e0ee293ec5e06cacbe3953ad44042f1473dae9 51ddc55c75087ac25342f6d73d3aeaf14f59bd76 is the first bad commit commit 51ddc55c75087ac25342f6d73d3aeaf14f59bd76 Author: Aleksandr Nogikh Date: Wed Jul 29 09:04:54 2026 +0000 usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs commit f0efaf1872949e96d213c8e910fd9517f7d7c406 upstream. A null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting to clean up an endpoint that was never initialized. When configuring the MIDI 2.0 gadget via configfs and setting the block direction to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out endpoint is explicitly skipped during the gadget bind phase (f_midi2_bind()). As a result, the usb_ep->card field remains NULL. Later, when the host sets the alternate setting, f_midi2_set_alt() unconditionally stops both the IN and OUT endpoints by calling f_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both endpoints. When f_midi2_free_ep_reqs() is called for the uninitialized midi1_ep_out, it attempts to dereference usb_ep->card to determine the number of requests to free, leading to a crash. Fix this by using usb_ep->num_reqs instead of usb_ep->card->info.num_reqs in f_midi2_free_ep_reqs(). usb_ep->num_reqs is correctly set during f_midi2_init_ep() and remains 0 if the endpoint was never initialized, safely avoiding the loop. For consistency, apply the same change to f_midi2_alloc_ep_reqs(). Oops: general protection fault, probably for non-canonical address 0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777] ... RIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166 [inline] RIP: 0010:f_midi2_stop_eps+0x28e/0x4d0 drivers/usb/gadget/function/f_midi2.c:1246 ... Call Trace: f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296 composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933 configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877 Fixes: 8b645922b223 ("usb: gadget: Add support for USB MIDI 2.0 function driver") Cc: stable Assisted-by: Gemini:gemini-3.5-flash Gemini:gemini-3.1-pro-preview syzbot Reported-by: syzbot+bbb6dad313f4aaa8da6b@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=bbb6dad313f4aaa8da6b Link: https://syzkaller.appspot.com/ai_job?id=8ce30b1a-8cf7-4e38-bcf7-1f69e6f6313f Signed-off-by: Aleksandr Nogikh Reviewed-by: Takashi Iwai Closes: https://syzkaller.appspot.com/bug?extid=01a17afb30637396955e Link: https://patch.msgid.link/cafe65f4-e1bb-46a3-901d-732814b861b2@mail.kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman drivers/usb/gadget/function/f_midi2.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) accumulated error probability: 0.00 culprit signature: 1a72887e4d33509121b4aeacc5f1e89197434e51a3f81160a595884104e85518 parent signature: a4ec744a7c8997818f4570f65db88e076b4b1347d6856c44f76ee8ae0a7843f5 revisions tested: 21, total time: 6h15m50.996776791s (build: 1h53m7.163266328s, test: 3h45m21.222326696s) first good commit: 51ddc55c75087ac25342f6d73d3aeaf14f59bd76 usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs recipients (to): ["gregkh@linuxfoundation.org" "nogikh@google.com" "tiwai@suse.de"] recipients (cc): []