ci2 starts bisection 2025-08-12 23:22:09.129420694 +0000 UTC m=+21016.639896152 bisecting fixing commit since 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 building syzkaller on 115ceea74e11fcf2b7ad5717ef91980f501cc81b ensuring issue is reproducible on original commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 9c15551a1c58c8ba08b0bf03ec990b19d7a7df89e8686fcc816ed5cf50f61b0d all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 73af5c8ed8f80be44354336e33ab10ed53809dbfdccdd48ade4aa4b4b204477c all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the bug reproduces without the instrumentation disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed kconfig minimization: base=3913 full=7684 leaves diff=2100 split chunks (needed=false): <2100> split chunk #0 of len 2100 into 5 parts testing without sub-chunk 1/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: b0f38fbb54b0301f623ca7e42c22d84375398ec9f65af2c2b665239b41ec4054 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: fe96ed90b3cb9c6352ec9fabda4950410fc3ed9fcb42526027e5ee657f7f59fa all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 47f4bb625adf7fbc1b924c4cbf4a8bb24e703291c8e9acb7a3286bf6de53356f all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 5e225e9aaa9de1aa5ce147eb38813e0c3ebe40e0958218a8da2b92beeba0aab4 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: f261b8de81857264e3a8d9182e2704328e86cd0fec0371a9666e6993d2365567 all runs: OK false negative chance: 0.000 minimized to 420 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 NOP_USB_XCEIV 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_CHIPIDEA USB_CHIPIDEA_GENERIC USB_CHIPIDEA_HOST USB_CHIPIDEA_MSM USB_CHIPIDEA_PCI USB_CHIPIDEA_UDC 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_MIDI2 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_CONN_GPIO 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_HAPS USB_DWC3_OF_SIMPLE USB_DWC3_PCI USB_DWC3_ULPI USB_DYNAMIC_MINORS USB_EG20T USB_EHCI_FSL 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_MIDI2 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_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_LGM_PHY USB_LIBCOMPOSITE USB_LINK_LAYER_TEST USB_M5602 USB_MA901 USB_MAX3420_UDC 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_AQC111 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_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_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_PCI_RENESAS 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_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_FS 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 ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZBUD] disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed testing current HEAD 3a8ababb8b6a0ced2be230b60b6e3ddbd8d67014 testing commit 3a8ababb8b6a0ced2be230b60b6e3ddbd8d67014 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 5b4f34c134094d4692d2a86348b77405412fe82a248cd6871840d267cf2aa9d1 all runs: OK false negative chance: 0.000 # git bisect start 3a8ababb8b6a0ced2be230b60b6e3ddbd8d67014 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 Bisecting: 286 revisions left to test after this (roughly 8 steps) [401239811fa728fcdd53e360a91f157ffd23e1f4] vsock: Fix transport_{g2h,h2g} TOCTOU determine whether the revision contains the guilty commit revision 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 crashed and is reachable testing commit 401239811fa728fcdd53e360a91f157ffd23e1f4 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: d37c43f0e7d08fcdca60e093884053a97c8aca052f261ac26f91c512b45bd817 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good 401239811fa728fcdd53e360a91f157ffd23e1f4 Bisecting: 143 revisions left to test after this (roughly 7 steps) [329a80adc0e5f815d0514a6d403aaaf0995cd9be] soc: aspeed: lpc-snoop: Don't disable channels that aren't enabled determine whether the revision contains the guilty commit revision 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 crashed and is reachable testing commit 329a80adc0e5f815d0514a6d403aaaf0995cd9be gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 40689a8d18f68f70f1af5236aaa12922d501592ee2e90a504c2a4a32535a03a7 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good 329a80adc0e5f815d0514a6d403aaaf0995cd9be Bisecting: 71 revisions left to test after this (roughly 6 steps) [6a85c96e61c1fb99b4bc298a8448787269db5836] interconnect: qcom: sc7280: Add missing num_links to xm_pcie3_1 node determine whether the revision contains the guilty commit revision 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 crashed and is reachable testing commit 6a85c96e61c1fb99b4bc298a8448787269db5836 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: a8a08bcd8968d8e814f0b49a1058715c6a5f65b0266862dd1b8f76d3d18a43d0 all runs: OK false negative chance: 0.000 # git bisect bad 6a85c96e61c1fb99b4bc298a8448787269db5836 Bisecting: 35 revisions left to test after this (roughly 5 steps) [dcbc346f50a009d8b7f4e330f9f2e22d6442fa26] ipv6: mcast: Delay put pmc->idev in mld_del_delrec() determine whether the revision contains the guilty commit revision 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 crashed and is reachable testing commit dcbc346f50a009d8b7f4e330f9f2e22d6442fa26 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 8202e059cbfe4ec1263e9fd7b9f529f9f7e66f3cf3152a9373742370779d3f18 all runs: OK false negative chance: 0.000 # git bisect bad dcbc346f50a009d8b7f4e330f9f2e22d6442fa26 Bisecting: 17 revisions left to test after this (roughly 4 steps) [21033b49cf094ebd9c545ea7b9bed04d084ce84d] block: fix kobject leak in blk_unregister_queue determine whether the revision contains the guilty commit revision 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 crashed and is reachable testing commit 21033b49cf094ebd9c545ea7b9bed04d084ce84d gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 5d14259db4ae32fa1d4b73901e9f3e73c0b606cf0bb606c8d210fa2ff2e6a427 all runs: OK false negative chance: 0.000 # git bisect bad 21033b49cf094ebd9c545ea7b9bed04d084ce84d Bisecting: 8 revisions left to test after this (roughly 3 steps) [c9d3d9667443caafa804cd07940aeaef8e53aa90] comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large determine whether the revision contains the guilty commit revision 401239811fa728fcdd53e360a91f157ffd23e1f4 crashed and is reachable testing commit c9d3d9667443caafa804cd07940aeaef8e53aa90 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: b9dcea1f1aa4fbf37e6698428832d90642ecb0fc24a677c3925f9902c72a3cf2 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good c9d3d9667443caafa804cd07940aeaef8e53aa90 Bisecting: 4 revisions left to test after this (roughly 2 steps) [84830e033bd25ea37337957e2c61c2495815a4ea] soundwire: amd: fix for handling slave alerts after link is down determine whether the revision contains the guilty commit revision 401239811fa728fcdd53e360a91f157ffd23e1f4 crashed and is reachable testing commit 84830e033bd25ea37337957e2c61c2495815a4ea gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 88390afb4f97ea16bd2d1feafef47c701b7ec1a5dc3d7e366f47d05cede1af90 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good 84830e033bd25ea37337957e2c61c2495815a4ea Bisecting: 2 revisions left to test after this (roughly 1 step) [e7be679124bae8cf4fa6e40d7e1661baddfb3289] bpf: Reject %p% format string in bprintf-like helpers determine whether the revision contains the guilty commit revision 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 crashed and is reachable testing commit e7be679124bae8cf4fa6e40d7e1661baddfb3289 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 084217e5a97cd2fd2775fea3c5979c276fb295455028adf46806c28009cc9d35 all runs: OK false negative chance: 0.000 # git bisect bad e7be679124bae8cf4fa6e40d7e1661baddfb3289 Bisecting: 0 revisions left to test after this (roughly 0 steps) [12e023df10b6bffc2c39152a0caa6ba1d1cfd180] soundwire: amd: fix for clearing command status register determine whether the revision contains the guilty commit revision 329a80adc0e5f815d0514a6d403aaaf0995cd9be crashed and is reachable testing commit 12e023df10b6bffc2c39152a0caa6ba1d1cfd180 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 8f73a696271f98594d104ff1ef55ecceeea59e8e40d22f26561d1463ac9b4440 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good 12e023df10b6bffc2c39152a0caa6ba1d1cfd180 e7be679124bae8cf4fa6e40d7e1661baddfb3289 is the first bad commit commit e7be679124bae8cf4fa6e40d7e1661baddfb3289 Author: Paul Chaignon Date: Tue Jul 1 21:47:30 2025 +0200 bpf: Reject %p% format string in bprintf-like helpers [ Upstream commit f8242745871f81a3ac37f9f51853d12854fd0b58 ] static const char fmt[] = "%p%"; bpf_trace_printk(fmt, sizeof(fmt)); The above BPF program isn't rejected and causes a kernel warning at runtime: Please remove unsupported %\x00 in format string WARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0 This happens because bpf_bprintf_prepare skips over the second %, detected as punctuation, while processing %p. This patch fixes it by not skipping over punctuation. %\x00 is then processed in the next iteration and rejected. Reported-by: syzbot+e2c932aec5c8a6e1d31c@syzkaller.appspotmail.com Fixes: 48cac3f4a96d ("bpf: Implement formatted output helpers with bstr_printf") Acked-by: Yonghong Song Signed-off-by: Paul Chaignon Link: https://lore.kernel.org/r/a0e06cc479faec9e802ae51ba5d66420523251ee.1751395489.git.paul.chaignon@gmail.com Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin kernel/bpf/helpers.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) accumulated error probability: 0.00 culprit signature: 084217e5a97cd2fd2775fea3c5979c276fb295455028adf46806c28009cc9d35 parent signature: 8f73a696271f98594d104ff1ef55ecceeea59e8e40d22f26561d1463ac9b4440 revisions tested: 17, total time: 4h34m11.867156939s (build: 2h24m19.433544252s, test: 2h0m49.641062251s) first good commit: e7be679124bae8cf4fa6e40d7e1661baddfb3289 bpf: Reject %p% format string in bprintf-like helpers recipients (to): ["ast@kernel.org" "paul.chaignon@gmail.com" "sashal@kernel.org" "yonghong.song@linux.dev"] recipients (cc): []