ci starts bisection 2024-02-29 10:16:50.577267651 +0000 UTC m=+39531.186077228 bisecting cause commit starting from 4ac828960a604e2ae72af59ce44dafdc8b12675f building syzkaller on 352ab9047be19ed1d8367b9113b7bde280c90124 ensuring issue is reproducible on original commit 4ac828960a604e2ae72af59ce44dafdc8b12675f testing commit 4ac828960a604e2ae72af59ce44dafdc8b12675f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3c9be2f2e83f15a87c70449eca0698a82778e04c6817b8a894b9e7cff0a88328 all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN KASAN], they are not needed testing commit 4ac828960a604e2ae72af59ce44dafdc8b12675f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c0c43c9fe8e794a4231409af9513f8252253c856c72e3e4896e2e0e6b691219f all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] the bug reproduces without the instrumentation disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed kconfig minimization: base=3937 full=7970 leaves diff=2020 split chunks (needed=false): <2020> split chunk #0 of len 2020 into 5 parts testing without sub-chunk 1/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN KASAN LOCKDEP], they are not needed testing commit 4ac828960a604e2ae72af59ce44dafdc8b12675f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 952eb675c1fbe29b3818a7ff3bc887bd5379597c24a844aad43c7029c3a2f5aa all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [HANG LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 4ac828960a604e2ae72af59ce44dafdc8b12675f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8ff9fd82474ecb5c35ece736cd2909ac1dc7ca20e43e3deaf949f32fa78c0934 all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN KASAN LOCKDEP], they are not needed testing commit 4ac828960a604e2ae72af59ce44dafdc8b12675f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 863bf32f7288e3614bae47a8ca60b4b01f0d35a3b02f7a351463bf213eb77920 all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 4ac828960a604e2ae72af59ce44dafdc8b12675f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a9c2413599bfb39d20e1d1d30d75a3772bed607179b5417b53f4a22e144608ba all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing commit 4ac828960a604e2ae72af59ce44dafdc8b12675f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 39a9478c900921fc9ddc4fc0cfb48b0578f07864d5cdc3178b040953ba04164a all runs: OK false negative chance: 0.000 minimized to 404 configs; suspects: [ARCH_ENABLE_MEMORY_HOTREMOVE ATM BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA COMMON_CLK CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DVB_CORE EXTCON FB GPIOLIB HID_ZEROPLUS I2C_MUX IIO IOMMUFD IRQ_REMAP KVM KVM_INTEL LIBNVDIMM MEDIA_ANALOG_TV_SUPPORT MEDIA_CAMERA_SUPPORT MEDIA_CEC_SUPPORT MEDIA_CONTROLLER MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_TEST_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_VIPERBOARD PARPORT PCCARD PCMCIA PHONET RADIO_ADAPTERS RADIO_SI470X RADIO_SI4713 RC_CORE RFKILL SND SOUND SPI SSB TAP TARGET_CORE TUN USB_AMD5536UDC USB_ATM USB_CONFIGFS USB_CONFIGFS_ACM USB_CONFIGFS_ECM USB_CONFIGFS_ECM_SUBSET USB_CONFIGFS_EEM USB_CONFIGFS_F_FS USB_CONFIGFS_F_HID USB_CONFIGFS_F_LB_SS USB_CONFIGFS_F_MIDI USB_CONFIGFS_F_PRINTER USB_CONFIGFS_F_TCM USB_CONFIGFS_F_UAC1 USB_CONFIGFS_F_UAC1_LEGACY USB_CONFIGFS_F_UAC2 USB_CONFIGFS_F_UVC USB_CONFIGFS_MASS_STORAGE USB_CONFIGFS_NCM USB_CONFIGFS_OBEX USB_CONFIGFS_PHONET USB_CONFIGFS_RNDIS USB_CONFIGFS_SERIAL USB_CXACRU USB_CYPRESS_CY7C63 USB_CYTHERM USB_DSBR USB_DUMMY_HCD USB_DWC2 USB_DWC2_HOST USB_DWC2_PCI USB_DWC3 USB_DWC3_GADGET USB_DWC3_OF_SIMPLE USB_DWC3_PCI USB_DWC3_ULPI USB_DYNAMIC_MINORS USB_EG20T USB_EHCI_HCD_PLATFORM USB_EHCI_ROOT_HUB_TT USB_EHSET_TEST_FIXTURE USB_EMI26 USB_EMI62 USB_EPSON2888 USB_EZUSB_FX2 USB_FEW_INIT_RETRIES USB_F_ACM USB_F_ECM USB_F_EEM USB_F_FS USB_F_HID USB_F_MASS_STORAGE USB_F_MIDI USB_F_NCM USB_F_OBEX USB_F_PHONET USB_F_PRINTER USB_F_RNDIS USB_F_SERIAL USB_F_SS_LB USB_F_SUBSET USB_F_TCM USB_F_UAC1 USB_F_UAC1_LEGACY USB_F_UAC2 USB_F_UVC USB_GADGET USB_GADGETFS USB_GADGET_DEBUG_FILES USB_GADGET_DEBUG_FS USB_GL860 USB_GOKU USB_GPIO_VBUS USB_GR_UDC USB_GSPCA USB_GSPCA_BENQ USB_GSPCA_CONEX USB_GSPCA_CPIA1 USB_GSPCA_DTCS033 USB_GSPCA_ETOMS USB_GSPCA_FINEPIX USB_GSPCA_JEILINJ USB_GSPCA_JL2005BCD USB_GSPCA_KINECT USB_GSPCA_KONICA USB_GSPCA_MARS USB_GSPCA_MR97310A USB_GSPCA_NW80X USB_GSPCA_OV519 USB_GSPCA_OV534 USB_GSPCA_OV534_9 USB_GSPCA_PAC207 USB_GSPCA_PAC7302 USB_GSPCA_PAC7311 USB_GSPCA_SE401 USB_GSPCA_SN9C2028 USB_GSPCA_SN9C20X USB_GSPCA_SONIXB USB_GSPCA_SONIXJ USB_GSPCA_SPCA1528 USB_GSPCA_SPCA500 USB_GSPCA_SPCA501 USB_GSPCA_SPCA505 USB_GSPCA_SPCA506 USB_GSPCA_SPCA508 USB_GSPCA_SPCA561 USB_GSPCA_SQ905 USB_GSPCA_SQ905C USB_GSPCA_SQ930X USB_GSPCA_STK014 USB_GSPCA_STK1135 USB_GSPCA_STV0680 USB_GSPCA_SUNPLUS USB_GSPCA_T613 USB_GSPCA_TOPRO USB_GSPCA_TOUPTEK USB_GSPCA_TV8532 USB_GSPCA_VC032X USB_GSPCA_VICAM USB_GSPCA_XIRLINK_CIT USB_GSPCA_ZC3XX USB_HACKRF USB_HCD_BCMA USB_HCD_SSB USB_HSIC_USB3503 USB_HSIC_USB4604 USB_HSO USB_HUB_USB251XB USB_IDMOUSE USB_IOWARRIOR USB_IPHETH USB_ISIGHTFW USB_ISP116X_HCD USB_ISP1301 USB_ISP1760 USB_ISP1760_DUAL_ROLE USB_ISP1760_HCD USB_ISP1761_UDC USB_KAWETH USB_KC2190 USB_KEENE USB_LAN78XX USB_LCD USB_LD USB_LEDS_TRIGGER_USBPORT USB_LED_TRIG USB_LEGOTOWER USB_LIBCOMPOSITE USB_LINK_LAYER_TEST USB_M5602 USB_MA901 USB_MAX3421_HCD USB_MDC800 USB_MICROTEK USB_MR800 USB_MSI2500 USB_MUSB_DUAL_ROLE USB_MUSB_HDRC USB_MV_U3D USB_MV_UDC USB_NET2272 USB_NET2272_DMA USB_NET2280 USB_NET_AX88179_178A USB_NET_AX8817X USB_NET_CDCETHER USB_NET_CDC_EEM USB_NET_CDC_MBIM USB_NET_CDC_NCM USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_CH9200 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_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_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_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_PLATFORM USB_XUSBATM USB_YUREX USERFAULTFD USERIO USERMODE_DRIVER 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 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 X86_X32_ABI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZEROPLUS_FF ZLIB_DEFLATE ZONEFS_FS ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_SHRINKER_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZSMALLOC] disabling configs for [LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed picked [v6.7 v6.6 v6.5 v6.3 v6.1 v5.19 v5.17 v5.15 v5.12 v5.9 v5.6 v5.3 v5.0 v4.19] out of 30 release tags testing release v6.7 testing commit 0dd3ee31125508cd67f7e7172247f05b7fd1753a gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ec1ed5627af828240f3af7219f091bf0e3fd7e4bab46313b809c07ca0fcd5e34 all runs: OK false negative chance: 0.000 # git bisect start 4ac828960a604e2ae72af59ce44dafdc8b12675f 0dd3ee31125508cd67f7e7172247f05b7fd1753a Bisecting: 7728 revisions left to test after this (roughly 13 steps) [cf65598d5909acf5e7b7dc9e21786e386356bc81] Merge tag 'drm-next-2024-01-10' of git://anongit.freedesktop.org/drm/drm testing commit cf65598d5909acf5e7b7dc9e21786e386356bc81 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3d32e42a3243a5e4f804e53b60f41475a7fa65d017ed00c97b6de6459664a063 all runs: OK false negative chance: 0.000 # git bisect good cf65598d5909acf5e7b7dc9e21786e386356bc81 Bisecting: 3865 revisions left to test after this (roughly 12 steps) [ab1e2d0fccc570c950fd939840ebc8efa3bd39b8] Merge tag 'for-v6.8-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply testing commit ab1e2d0fccc570c950fd939840ebc8efa3bd39b8 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e51eed10c8c64932e08c85b4234c4050429c8464d1f025d8917f7b12973198e2 all runs: OK false negative chance: 0.000 # git bisect good ab1e2d0fccc570c950fd939840ebc8efa3bd39b8 Bisecting: 1905 revisions left to test after this (roughly 11 steps) [4f5e5092fdbf5cec6bedc19fbe69cce4f5f08372] Merge tag 'net-6.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net testing commit 4f5e5092fdbf5cec6bedc19fbe69cce4f5f08372 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 22f3e4caf2eb260c6a54a4eda4166c674f5006020fbd69a883857fc013286d33 all runs: OK false negative chance: 0.000 # git bisect good 4f5e5092fdbf5cec6bedc19fbe69cce4f5f08372 Bisecting: 986 revisions left to test after this (roughly 10 steps) [26f4dac11775a1ca24e2605cb30e828d4dbdea93] netfilter: x_tables: Use unsafe_memcpy() for 0-sized destination testing commit 26f4dac11775a1ca24e2605cb30e828d4dbdea93 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c85b7f33fed63f1807195e5063586a75c90e4d236e6ca2a48fb38bc8d36de240 all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] # git bisect bad 26f4dac11775a1ca24e2605cb30e828d4dbdea93 Bisecting: 460 revisions left to test after this (roughly 9 steps) [20ea9327c2fd545d6b96e998727bcd724290694d] net: dccp: Simplify the allocation of slab caches in dccp_ackvec_init testing commit 20ea9327c2fd545d6b96e998727bcd724290694d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 55528fe3e85f59fca9ac0b0368560096c91295c01186da43a05b39c7e46fb9e8 all runs: OK false negative chance: 0.000 # git bisect good 20ea9327c2fd545d6b96e998727bcd724290694d Bisecting: 230 revisions left to test after this (roughly 8 steps) [2c0c32c72be29fba0bbd535308038b49caaf4fc1] octeon_ep_vf: add hardware configuration APIs testing commit 2c0c32c72be29fba0bbd535308038b49caaf4fc1 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9f7d5be039371a34200416b87bd44e5cf50edd42a86a275fc1793a49dc3b4d9d all runs: OK false negative chance: 0.000 # git bisect good 2c0c32c72be29fba0bbd535308038b49caaf4fc1 Bisecting: 115 revisions left to test after this (roughly 7 steps) [328771deab16fcac55763309bb59e28b1c050853] net: remove stale mentions of dev_base_lock in comments testing commit 328771deab16fcac55763309bb59e28b1c050853 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 165467c835047659ee234817f209e06f871c4f618b8212e948d4c19783230f52 all runs: OK false negative chance: 0.000 # git bisect good 328771deab16fcac55763309bb59e28b1c050853 Bisecting: 60 revisions left to test after this (roughly 6 steps) [d0bcc15cbae806cad7d1d90003c82ecb5833b533] tools: ynl: don't access uninitialized attr_space variable testing commit d0bcc15cbae806cad7d1d90003c82ecb5833b533 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8f0d51798df3c63350742e1347f02682dd569c37cf4574e2cceb64a9120d47ff all runs: OK false negative chance: 0.000 # git bisect good d0bcc15cbae806cad7d1d90003c82ecb5833b533 Bisecting: 27 revisions left to test after this (roughly 5 steps) [4934446297c292611d3b6cd388efb215f2ba5698] Merge tag 'linux-can-next-for-6.9-20240220' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next testing commit 4934446297c292611d3b6cd388efb215f2ba5698 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5482a64cca94503ebb714f0a5d2d1e862436e7545100295d0d0338472fbee48b all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] # git bisect bad 4934446297c292611d3b6cd388efb215f2ba5698 Bisecting: 16 revisions left to test after this (roughly 4 steps) [18ddbf5cf0e7553fd05c3e1a02d740514ee3f0a6] net: introduce abstraction for network memory testing commit 18ddbf5cf0e7553fd05c3e1a02d740514ee3f0a6 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c8a92ff2b0a517c19b853bb499fa504ac3d227457a8ab97af566b1b78bd446a4 all runs: OK false negative chance: 0.000 # git bisect good 18ddbf5cf0e7553fd05c3e1a02d740514ee3f0a6 Bisecting: 7 revisions left to test after this (roughly 3 steps) [a93fca920167755db7e931f9b302b355edec910a] Merge patch series "Add ECC feature support to Tx and Rx FIFOs for Xilinx CAN Controller." testing commit a93fca920167755db7e931f9b302b355edec910a gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 913eeea570f40a5026399bfd4d7c1e8db234e9446264489cde60a1f5034cc064 all runs: OK false negative chance: 0.000 # git bisect good a93fca920167755db7e931f9b302b355edec910a Bisecting: 3 revisions left to test after this (roughly 2 steps) [5d4cc87414c5d11345c4b11d61377d351b5c28a2] net: reorganize "struct sock" fields testing commit 5d4cc87414c5d11345c4b11d61377d351b5c28a2 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 1040bf7fdbd7a7ed6c653c3b6243d7de4cffa8c26479217c6d563b4bccac0521 all runs: OK false negative chance: 0.000 # git bisect good 5d4cc87414c5d11345c4b11d61377d351b5c28a2 Bisecting: 1 revision left to test after this (roughly 1 step) [00bf80c437dcbbd808d61cc2866c8f065ff436bd] can: raw: raw_getsockopt(): reduce scope of err testing commit 00bf80c437dcbbd808d61cc2866c8f065ff436bd gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d54806d6192cf1fbf593af116c63aec8f0ffe5e52b9da96a725c0fab003f6039 all runs: OK false negative chance: 0.000 # git bisect good 00bf80c437dcbbd808d61cc2866c8f065ff436bd Bisecting: 0 revisions left to test after this (roughly 0 steps) [219eee9c0d16f1b754a8b85275854ab17df0850a] net: skbuff: add overflow debug check to pull/push helpers testing commit 219eee9c0d16f1b754a8b85275854ab17df0850a gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: dc1053a038cfc05bb108644327bc5e3c9929ee7c83fedfd0df48df1c41db8d9b all runs: crashed: WARNING in skb_ensure_writable representative crash: WARNING in skb_ensure_writable, types: [WARNING] # git bisect bad 219eee9c0d16f1b754a8b85275854ab17df0850a 219eee9c0d16f1b754a8b85275854ab17df0850a is the first bad commit commit 219eee9c0d16f1b754a8b85275854ab17df0850a Author: Florian Westphal Date: Fri Feb 16 12:36:57 2024 +0100 net: skbuff: add overflow debug check to pull/push helpers syzbot managed to trigger following splat: BUG: KASAN: use-after-free in __skb_flow_dissect+0x4a3b/0x5e50 Read of size 1 at addr ffff888208a4000e by task a.out/2313 [..] __skb_flow_dissect+0x4a3b/0x5e50 __skb_get_hash+0xb4/0x400 ip_tunnel_xmit+0x77e/0x26f0 ipip_tunnel_xmit+0x298/0x410 .. Analysis shows that the skb has a valid ->head, but bogus ->data pointer. skb->data gets its bogus value via the neigh layer, which does: 1556 __skb_pull(skb, skb_network_offset(skb)); ... and the skb was already dodgy at this point: skb_network_offset(skb) returns a negative value due to an earlier overflow of skb->network_header (u16). __skb_pull thus "adjusts" skb->data by a huge offset, pointing outside skb->head area. Allow debug builds to splat when we try to pull/push more than INT_MAX bytes. After this, the syzkaller reproducer yields a more precise splat before the flow dissector attempts to read off skb->data memory: WARNING: CPU: 5 PID: 2313 at include/linux/skbuff.h:2653 neigh_connected_output+0x28e/0x400 ip_finish_output2+0xb25/0xed0 iptunnel_xmit+0x4ff/0x870 ipgre_xmit+0x78e/0xbb0 Signed-off-by: Florian Westphal Reviewed-by: Simon Horman Link: https://lore.kernel.org/r/20240216113700.23013-1-fw@strlen.de Signed-off-by: Paolo Abeni include/linux/skbuff.h | 6 ++++++ 1 file changed, 6 insertions(+) accumulated error probability: 0.00 culprit signature: dc1053a038cfc05bb108644327bc5e3c9929ee7c83fedfd0df48df1c41db8d9b parent signature: 1040bf7fdbd7a7ed6c653c3b6243d7de4cffa8c26479217c6d563b4bccac0521 revisions tested: 22, total time: 9h23m6.090290578s (build: 5h27m35.754127382s, test: 3h31m16.262715241s) first bad commit: 219eee9c0d16f1b754a8b85275854ab17df0850a net: skbuff: add overflow debug check to pull/push helpers recipients (to): ["fw@strlen.de" "horms@kernel.org" "pabeni@redhat.com"] recipients (cc): [] crash: WARNING in skb_ensure_writable ------------[ cut here ]------------ WARNING: CPU: 1 PID: 2798 at include/linux/skbuff.h:2723 pskb_may_pull_reason include/linux/skbuff.h:2723 [inline] WARNING: CPU: 1 PID: 2798 at include/linux/skbuff.h:2723 pskb_may_pull include/linux/skbuff.h:2739 [inline] WARNING: CPU: 1 PID: 2798 at include/linux/skbuff.h:2723 skb_ensure_writable+0x82/0xb0 net/core/skbuff.c:6103 Modules linked in: CPU: 1 PID: 2798 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:pskb_may_pull_reason include/linux/skbuff.h:2723 [inline] RIP: 0010:pskb_may_pull include/linux/skbuff.h:2739 [inline] RIP: 0010:skb_ensure_writable+0x82/0xb0 net/core/skbuff.c:6103 Code: 75 12 8b 8b c8 00 00 00 29 c1 01 e9 0f b7 43 7a 39 c1 76 d1 48 89 df 31 f6 31 d2 b9 20 08 00 00 5b 41 5e 5d e9 9f 89 ff ff 90 <0f> 0b 90 eb 8a 41 be f4 ff ff ff 39 e9 72 ac 89 ee 29 c6 48 89 df RSP: 0018:ffffc90000eb7bd8 EFLAGS: 00010286 RAX: 0000000000f52510 RBX: ffff888112ea3a00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000fb6014e4 RDI: ffff888112ea3a00 RBP: 00000000fb6014e4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff822133a0 R12: ffffc90000eb7c30 R13: ffff888112ea3a00 R14: ffffc90000162000 R15: 0000000000000000 FS: 00007f4f286806c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f28c290c0 CR3: 0000000112152000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __bpf_try_make_writable net/core/filter.c:1665 [inline] bpf_try_make_writable net/core/filter.c:1671 [inline] ____bpf_skb_pull_data net/core/filter.c:1862 [inline] bpf_skb_pull_data+0x1a/0x60 net/core/filter.c:1851 ___bpf_prog_run+0x5f6/0x2280 kernel/bpf/core.c:1986 __bpf_prog_run32+0xbb/0xe0 kernel/bpf/core.c:2225 bpf_dispatcher_nop_func include/linux/bpf.h:1235 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_test_run+0x1ce/0x300 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x351/0x4b0 net/bpf/test_run.c:1056 bpf_prog_test_run+0xe2/0x100 kernel/bpf/syscall.c:4188 __sys_bpf+0x2ff/0x5a0 kernel/bpf/syscall.c:5591 __do_sys_bpf kernel/bpf/syscall.c:5680 [inline] __se_sys_bpf kernel/bpf/syscall.c:5678 [inline] __x64_sys_bpf+0x17/0x20 kernel/bpf/syscall.c:5678 do_syscall_64+0xe6/0x230 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f4f28afeda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4f286800c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f4f28c2cf80 RCX: 00007f4f28afeda9 RDX: 0000000000000050 RSI: 0000000020000080 RDI: 000000000000000a RBP: 00007f4f28b4b47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4f28c2cf80 R15: 00007fff70c98fb8