ci starts bisection 2024-02-19 07:24:26.633984994 +0000 UTC m=+267812.226313368 bisecting cause commit starting from b401b621758e46812da61fa58a67c3fd8d91de0d building syzkaller on 578f753887693e1375d17cf79dc1c575f6032a5d ensuring issue is reproducible on original commit b401b621758e46812da61fa58a67c3fd8d91de0d testing commit b401b621758e46812da61fa58a67c3fd8d91de0d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e9d4a2873b630ced469d506e302e5b63fa24f09837b869a49663c841dbf8e35e all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit b401b621758e46812da61fa58a67c3fd8d91de0d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a6b9fbd7d2664f947004944c46581ca7a80f4e40a015c0116c729ee3eb503daa all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed kconfig minimization: base=3937 full=7963 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 [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit b401b621758e46812da61fa58a67c3fd8d91de0d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d5d52d7bb6474c4cebc5bc967dee337e1a8cf113dbfdb1f8b739293caed892af all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit b401b621758e46812da61fa58a67c3fd8d91de0d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 2bf707e1ccf032eacca03e830fd118ab8ee21517009876b16733fafeca762903 all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit b401b621758e46812da61fa58a67c3fd8d91de0d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a6edc73bb5f277ebf0ac38ea074a1910a2ee42611128b430b501c2334847d35f all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit b401b621758e46812da61fa58a67c3fd8d91de0d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f134abe3ccff604dc1b569a5a428c95ee817cc7df9d2face01e96b69acda7ad1 all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [LEAK UBSAN BUG KASAN ATOMIC_SLEEP HANG], they are not needed testing commit b401b621758e46812da61fa58a67c3fd8d91de0d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f2a8d38ec648afed57553abf2aadb3f2655406b4aad77b83e5fa1ca43c9ddceb 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 [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], 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: 7d6ad2c85b98e4996afdd805706c49396400b9370a8fd1d3ba217052e94991c8 all runs: OK false negative chance: 0.000 # git bisect start b401b621758e46812da61fa58a67c3fd8d91de0d 0dd3ee31125508cd67f7e7172247f05b7fd1753a Bisecting: 8442 revisions left to test after this (roughly 13 steps) [ba5afb9a84df2e6b26a1b6389b98849cd16ea757] fs: rework listmount() implementation testing commit ba5afb9a84df2e6b26a1b6389b98849cd16ea757 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8c9a7cd06f389e813eaccf441e498e03e5f6284fc269d86152bf66aacb7a15ee all runs: OK false negative chance: 0.000 # git bisect good ba5afb9a84df2e6b26a1b6389b98849cd16ea757 Bisecting: 4234 revisions left to test after this (roughly 12 steps) [5d197e97fb106c09d3d013be341e5961fd70ec8a] Merge tag 'hsi-for-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-hsi testing commit 5d197e97fb106c09d3d013be341e5961fd70ec8a gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 45b5999bb36bc945982764f633c6d47b9285e27576449965aa55f09608dd48db all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] # git bisect bad 5d197e97fb106c09d3d013be341e5961fd70ec8a Bisecting: 1995 revisions left to test after this (roughly 11 steps) [d2197029026021ea4bc68475e5abef2213c8b01c] Merge tag 'drm-xe-next-2023-12-21-pr1-1' of https://gitlab.freedesktop.org/drm/xe/kernel into drm-next testing commit d2197029026021ea4bc68475e5abef2213c8b01c gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f9fd5e16e7558a68d5ecee0f5de601b55def91f1391b8e7a79d495b323ee2d4e all runs: OK false negative chance: 0.000 # git bisect good d2197029026021ea4bc68475e5abef2213c8b01c Bisecting: 1062 revisions left to test after this (roughly 10 steps) [a3cc31e75185f9b1ad8dc45eac77f8de788dc410] Merge tag 'libnvdimm-for-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm testing commit a3cc31e75185f9b1ad8dc45eac77f8de788dc410 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 484dc4512bcfade0e6838094406c9a24dd188ce09aab94a433e6d9b3ea05162e all runs: OK false negative chance: 0.000 # git bisect good a3cc31e75185f9b1ad8dc45eac77f8de788dc410 Bisecting: 525 revisions left to test after this (roughly 9 steps) [7f5e47f785140c2d7948bee6fc387f939f68dbb8] Merge tag 'mm-hotfixes-stable-2024-01-12-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm testing commit 7f5e47f785140c2d7948bee6fc387f939f68dbb8 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3996eb4ea3f9b8afa9cead32f1ec012c2934844170f60ae00892e11a4eb261b0 all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] # git bisect bad 7f5e47f785140c2d7948bee6fc387f939f68dbb8 Bisecting: 268 revisions left to test after this (roughly 8 steps) [0677a2d9b735c1d57410dd188eb93ce61635987c] media: ov2740: Add support for 180 MHz link frequency testing commit 0677a2d9b735c1d57410dd188eb93ce61635987c gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 741372dbdfe09398ee64c096651403686153f5eef6b20323b3ee759552f8b895 all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] # git bisect bad 0677a2d9b735c1d57410dd188eb93ce61635987c Bisecting: 133 revisions left to test after this (roughly 7 steps) [6147bdd895df0e209110684c760c9463dadc7822] media: mediatek: vcodec: Set the supported vp9 level for each platform testing commit 6147bdd895df0e209110684c760c9463dadc7822 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 043c63174c657bc78880df6b4bd8d704e8ec56d7a95f5e5f6470935bd5c8393e all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] # git bisect bad 6147bdd895df0e209110684c760c9463dadc7822 Bisecting: 66 revisions left to test after this (roughly 6 steps) [912472fd07da4be0de80b49d61b8cb4fb1b0835b] media: usb: airspy: Stop direct calls to queue num_buffers field testing commit 912472fd07da4be0de80b49d61b8cb4fb1b0835b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b8e2b57783c207e920a1b7376711c7a572954879dae01a807e67a806c1afebac all runs: OK false negative chance: 0.000 # git bisect good 912472fd07da4be0de80b49d61b8cb4fb1b0835b Bisecting: 33 revisions left to test after this (roughly 5 steps) [3907f6ef8e0d55a88cdb0f7238363d24e26790ca] media: visl: Hook the (TRY_)DECODER_CMD stateless ioctls testing commit 3907f6ef8e0d55a88cdb0f7238363d24e26790ca gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b85e941fe1425a80a40afc586db89e54b5ddf2c79ffbbd5d4440cba8c570d36c all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] # git bisect bad 3907f6ef8e0d55a88cdb0f7238363d24e26790ca Bisecting: 16 revisions left to test after this (roughly 4 steps) [ed5000fe5ac48980bf0b2a707c64bba184dd83d2] media: v4l2-mem2mem.h: fix typo in comment testing commit ed5000fe5ac48980bf0b2a707c64bba184dd83d2 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 843b05a3db37835674b2f588efc82237fe7bfb490781cc1874402e4ce0d35864 all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] # git bisect bad ed5000fe5ac48980bf0b2a707c64bba184dd83d2 Bisecting: 7 revisions left to test after this (roughly 3 steps) [26711491a807ab3b1a04afad839ca48b6d34e63e] media: verisilicon: Refactor postprocessor to store more buffers testing commit 26711491a807ab3b1a04afad839ca48b6d34e63e gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: cbc723ab0cd0697e66e6a606da134fb55f34dadab7ea588ef6551f675d92f5fc all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] # git bisect bad 26711491a807ab3b1a04afad839ca48b6d34e63e Bisecting: 3 revisions left to test after this (roughly 2 steps) [c838530d230bc638d79b78737fc4488ffc28c1ee] media: media videobuf2: Be more flexible on the number of queue stored buffers testing commit c838530d230bc638d79b78737fc4488ffc28c1ee gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ec507db4af246144d253cb52a588c58ac8b31432efb6dfc041bbfbf855222c2b all runs: crashed: possible deadlock in vb2_video_unregister_device representative crash: possible deadlock in vb2_video_unregister_device, types: [LOCKDEP] # git bisect bad c838530d230bc638d79b78737fc4488ffc28c1ee Bisecting: 1 revision left to test after this (roughly 1 step) [7e17d44d61921cab8e52cb30cc082e3ee96abddd] media: usb: hackrf: Stop direct calls to queue num_buffers field testing commit 7e17d44d61921cab8e52cb30cc082e3ee96abddd gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 65b50056b4b2efe1f61633479fca0f1030ae5a03f27ba54e3c6080f1d0ba7342 all runs: OK false negative chance: 0.000 # git bisect good 7e17d44d61921cab8e52cb30cc082e3ee96abddd Bisecting: 0 revisions left to test after this (roughly 0 steps) [4545ca51dd5bd1a652d514a5de9e8ec97579a5b1] media: usb: usbtv: Stop direct calls to queue num_buffers field testing commit 4545ca51dd5bd1a652d514a5de9e8ec97579a5b1 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 25be83305c11e1e3cf559b85f9f1eb1061ba6404690695bb27d36759ab925bac all runs: OK false negative chance: 0.000 # git bisect good 4545ca51dd5bd1a652d514a5de9e8ec97579a5b1 c838530d230bc638d79b78737fc4488ffc28c1ee is the first bad commit commit c838530d230bc638d79b78737fc4488ffc28c1ee Author: Benjamin Gaignard Date: Thu Nov 9 17:34:59 2023 +0100 media: media videobuf2: Be more flexible on the number of queue stored buffers Add 'max_num_buffers' field in vb2_queue struct to let drivers decide how many buffers could be stored in a queue. This require 'bufs' array to be allocated at queue init time and freed when releasing the queue. By default VB2_MAX_FRAME remains the limit. Signed-off-by: Benjamin Gaignard Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab drivers/media/common/videobuf2/videobuf2-core.c | 46 ++++++++++++++++++++----- drivers/media/common/videobuf2/videobuf2-v4l2.c | 6 ++-- include/media/videobuf2-core.h | 12 ++++++- 3 files changed, 52 insertions(+), 12 deletions(-) accumulated error probability: 0.00 culprit signature: ec507db4af246144d253cb52a588c58ac8b31432efb6dfc041bbfbf855222c2b parent signature: 25be83305c11e1e3cf559b85f9f1eb1061ba6404690695bb27d36759ab925bac revisions tested: 22, total time: 5h45m7.798516066s (build: 3h2m56.89220343s, test: 2h26m11.464030488s) first bad commit: c838530d230bc638d79b78737fc4488ffc28c1ee media: media videobuf2: Be more flexible on the number of queue stored buffers recipients (to): ["benjamin.gaignard@collabora.com" "hverkuil-cisco@xs4all.nl" "mchehab@kernel.org"] recipients (cc): [] crash: possible deadlock in vb2_video_unregister_device usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: syz usb 1-1: Manufacturer: syz usb 1-1: SerialNumber: syz usb 1-1: config 0 descriptor?? usbtv 1-1:0.0: Fushicai USBTV007 Audio-Video Grabber usb 1-1: USB disconnect, device number 2 ============================================ WARNING: possible recursive locking detected 6.7.0-rc2-syzkaller #0 Not tainted -------------------------------------------- kworker/1:2/2216 is trying to acquire lock: ffff88810eb81b70 (&usbtv->vb2q_lock){+.+.}-{3:3}, at: vb2_video_unregister_device+0x6a/0xb0 drivers/media/common/videobuf2/videobuf2-v4l2.c:1272 but task is already holding lock: ffff88810eb81b70 (&usbtv->vb2q_lock){+.+.}-{3:3}, at: usbtv_video_free+0x1d/0x70 drivers/media/usb/usbtv/usbtv-video.c:966 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&usbtv->vb2q_lock); lock(&usbtv->vb2q_lock); *** DEADLOCK *** May be due to missing lock nesting notation 7 locks held by kworker/1:2/2216: #0: ffff88810425ef38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline] #0: ffff88810425ef38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x1f2/0x4d0 kernel/workqueue.c:2703 #1: ffffc90000e5fe58 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline] #1: ffffc90000e5fe58 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x1f2/0x4d0 kernel/workqueue.c:2703 #2: ffff88810ca6b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline] #2: ffff88810ca6b190 (&dev->mutex){....}-{3:3}, at: hub_event+0x7e/0x1b20 drivers/usb/core/hub.c:5791 #3: ffff888119608990 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline] #3: ffff888119608990 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x80/0x290 drivers/usb/core/hub.c:2251 #4: ffff88811960f160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline] #4: ffff88811960f160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff88811960f160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x47/0x2a0 drivers/base/dd.c:1292 #5: ffff88810eb81b70 (&usbtv->vb2q_lock){+.+.}-{3:3}, at: usbtv_video_free+0x1d/0x70 drivers/media/usb/usbtv/usbtv-video.c:966 #6: ffff88810eb81ae0 (&usbtv->v4l2_lock){+.+.}-{3:3}, at: usbtv_video_free+0x2e/0x70 drivers/media/usb/usbtv/usbtv-video.c:967 stack backtrace: CPU: 1 PID: 2216 Comm: kworker/1:2 Not tainted 6.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xe0 lib/dump_stack.c:106 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3855 [inline] __lock_acquire+0x10ba/0x2490 kernel/locking/lockdep.c:5136 lock_acquire+0xea/0x270 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:747 vb2_video_unregister_device+0x6a/0xb0 drivers/media/common/videobuf2/videobuf2-v4l2.c:1272 usbtv_video_free+0x42/0x70 drivers/media/usb/usbtv/usbtv-video.c:970 usbtv_disconnect+0x2c/0x50 drivers/media/usb/usbtv/usbtv-core.c:138 usb_unbind_interface+0xb7/0x260 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x1a4/0x2a0 drivers/base/dd.c:1295 bus_remove_device+0x147/0x190 drivers/base/bus.c:574 device_del+0x22b/0x370 drivers/base/core.c:3814 usb_disable_device+0x78/0x1f0 drivers/usb/core/message.c:1416 usb_disconnect+0xfc/0x290 drivers/usb/core/hub.c:2260 hub_port_connect drivers/usb/core/hub.c:5303 [inline] hub_port_connect_change drivers/usb/core/hub.c:5603 [inline] port_event drivers/usb/core/hub.c:5763 [inline] hub_event+0xc2f/0x1b20 drivers/usb/core/hub.c:5845 process_one_work kernel/workqueue.c:2630 [inline] process_scheduled_works+0x250/0x4d0 kernel/workqueue.c:2703 worker_thread+0x23d/0x300 kernel/workqueue.c:2784 kthread+0xe9/0x100 kernel/kthread.c:388 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242