ci2 starts bisection 2025-10-18 17:48:34.510407495 +0000 UTC m=+72684.146506084 bisecting fixing commit since 60a9e718726fa7019ae00916e4b1c52498da5b60 building syzkaller on e2beed91937c0ace342f19a2e9afb67adb3a828a ensuring issue is reproducible on original commit 60a9e718726fa7019ae00916e4b1c52498da5b60 testing commit 60a9e718726fa7019ae00916e4b1c52498da5b60 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 9cae9f6d44f4c5514fdd3e74a4fc79d2ebff6c73ca445ad619145790b6df3735 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [locking atomic_sleep hang memleak ubsan kasan], they are not needed testing commit 60a9e718726fa7019ae00916e4b1c52498da5b60 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 2e01143306ef84743c8fa8a13d3af4ab11a6e874b78942ccb8da629806413231 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, 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=7800 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 [ubsan kasan locking atomic_sleep hang memleak], they are not needed testing commit 60a9e718726fa7019ae00916e4b1c52498da5b60 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 23b5d05fc427dccf4db4a0ddaa38b7b9eeb2f1cf6aaf88b7c8229d52d3f221e8 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, 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 60a9e718726fa7019ae00916e4b1c52498da5b60 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 34320b4b79a69ce6d21499ca03562a529689bbeb261df21dc7f67f4fee5c6f10 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed testing commit 60a9e718726fa7019ae00916e4b1c52498da5b60 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 6f1c3854016413189227086f32fe822d0a5e979337f34c44855422b0a4cc00c1 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed testing commit 60a9e718726fa7019ae00916e4b1c52498da5b60 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: a9ad0ba9b94138bbb26a1507f6468984cc49ae359a201c9fa843bec8db780362 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 60a9e718726fa7019ae00916e4b1c52498da5b60 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 5b20f57483d4024db8c5572b499642bc80840d8c531f6e30031b254aa5ccc9e2 all runs: OK false negative chance: 0.000 minimized to 432 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_BDC_UDC USB_BELKIN USB_C67X00_HCD USB_CATC USB_CDC_PHONET USB_CDNS2_UDC USB_CDNS3 USB_CDNS3_GADGET USB_CDNS3_HOST USB_CDNS3_PCI_WRAP USB_CDNSP_GADGET USB_CDNSP_HOST USB_CDNSP_PCI USB_CDNS_HOST USB_CDNS_SUPPORT USB_CHAOSKEY 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 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 [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing current HEAD 0bbbd97a442d5e0136cc2ee921a4b76542d618ce testing commit 0bbbd97a442d5e0136cc2ee921a4b76542d618ce gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 99db3db3f1dd273e7c4868f2bec58fe6e96b7f282fc5f99a86d4694a1cb1cbc0 all runs: OK false negative chance: 0.000 # git bisect start 0bbbd97a442d5e0136cc2ee921a4b76542d618ce 60a9e718726fa7019ae00916e4b1c52498da5b60 Bisecting: 247 revisions left to test after this (roughly 8 steps) [7ea47a560a7a3e7edc6d33dea9e141737a75d742] drm/ast: Use msleep instead of mdelay for edid read determine whether the revision contains the guilty commit revision 60a9e718726fa7019ae00916e4b1c52498da5b60 crashed and is reachable testing commit 7ea47a560a7a3e7edc6d33dea9e141737a75d742 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 043613d4302947e4807fb725f59d2e1fb051dc177950961ca20b8cd668505065 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] # git bisect good 7ea47a560a7a3e7edc6d33dea9e141737a75d742 Bisecting: 123 revisions left to test after this (roughly 7 steps) [c1a15609eade7d951f32305894f2b390d128e7a4] hwrng: nomadik - add ARM_AMBA dependency determine whether the revision contains the guilty commit revision 60a9e718726fa7019ae00916e4b1c52498da5b60 crashed and is reachable testing commit c1a15609eade7d951f32305894f2b390d128e7a4 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 78a54c96a200a54b0e111bc5b0e619830f722d49cc2e2b3dac462740144e38d0 all runs: OK false negative chance: 0.000 # git bisect bad c1a15609eade7d951f32305894f2b390d128e7a4 Bisecting: 61 revisions left to test after this (roughly 6 steps) [8100b6c0f9089d5b156642b81270ce27fff17490] EDAC/i10nm: Skip DIMM enumeration on a disabled memory controller determine whether the revision contains the guilty commit revision 7ea47a560a7a3e7edc6d33dea9e141737a75d742 crashed and is reachable testing commit 8100b6c0f9089d5b156642b81270ce27fff17490 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: e9febcabdb4bdfb4d20f6a630e4154d6f68f75dd377f5516e5d181a8a848ac0e all runs: OK false negative chance: 0.000 # git bisect bad 8100b6c0f9089d5b156642b81270ce27fff17490 Bisecting: 30 revisions left to test after this (roughly 5 steps) [7f7187118bb5702f21516b8e8994300b51ecf0fd] ASoC: amd: acp: Adjust pdm gain value determine whether the revision contains the guilty commit revision 60a9e718726fa7019ae00916e4b1c52498da5b60 crashed and is reachable testing commit 7f7187118bb5702f21516b8e8994300b51ecf0fd gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 7cfbe75e3e1ce164100864599b67c8fa019d3b805d97c7780679466176dd6a60 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] # git bisect good 7f7187118bb5702f21516b8e8994300b51ecf0fd Bisecting: 15 revisions left to test after this (roughly 4 steps) [e857421992ceb93fed46ac79807e16aedb6d5b17] staging: axis-fifo: flush RX FIFO on read errors determine whether the revision contains the guilty commit revision 7f7187118bb5702f21516b8e8994300b51ecf0fd crashed and is reachable testing commit e857421992ceb93fed46ac79807e16aedb6d5b17 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 940aeee520be49a3e01ab09e4bff48d141c844ab07a3c733e50bda6892a855ac all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] # git bisect good e857421992ceb93fed46ac79807e16aedb6d5b17 Bisecting: 7 revisions left to test after this (roughly 3 steps) [a312ec6d768abf32a695c550ecbfe5e655d48e3e] filelock: add FL_RECLAIM to show_fl_flags() macro determine whether the revision contains the guilty commit revision 60a9e718726fa7019ae00916e4b1c52498da5b60 crashed and is reachable testing commit a312ec6d768abf32a695c550ecbfe5e655d48e3e gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 637d921b405cdedaccbf7fb5e5017d0a66e90f9d0630933a7bab2a83f7405b6f all runs: OK false negative chance: 0.000 # git bisect bad a312ec6d768abf32a695c550ecbfe5e655d48e3e Bisecting: 3 revisions left to test after this (roughly 2 steps) [ab172f4f42626549b02bada05f09e3f2b0cc26ec] crypto: rng - Ensure set_ent is always present determine whether the revision contains the guilty commit revision 7f7187118bb5702f21516b8e8994300b51ecf0fd crashed and is reachable testing commit ab172f4f42626549b02bada05f09e3f2b0cc26ec gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 1230868899293574302fb9c6f78af8028354dc61b90b6410623920ed05c2826d all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] # git bisect good ab172f4f42626549b02bada05f09e3f2b0cc26ec Bisecting: 1 revision left to test after this (roughly 1 step) [3d3abf3f7e8b1abb082070a343de82d7efc80523] KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O determine whether the revision contains the guilty commit revision 7f7187118bb5702f21516b8e8994300b51ecf0fd crashed and is reachable testing commit 3d3abf3f7e8b1abb082070a343de82d7efc80523 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: c58ec073d090b7c4fc8ddcf61a99f58017d55bbe802b0c2fa1b99ab36e7cc894 all runs: OK false negative chance: 0.000 # git bisect bad 3d3abf3f7e8b1abb082070a343de82d7efc80523 Bisecting: 0 revisions left to test after this (roughly 0 steps) [284e67a93b8c48952b6fc82129a8d3eb9dc73b06] net/9p: fix double req put in p9_fd_cancelled determine whether the revision contains the guilty commit revision 7ea47a560a7a3e7edc6d33dea9e141737a75d742 crashed and is reachable testing commit 284e67a93b8c48952b6fc82129a8d3eb9dc73b06 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 7df751e2bd73416c7c6c0f78b5a0580673687fa2670f4a5ac265bc559e098ad7 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run representative crash: WARNING in kvm_arch_vcpu_ioctl_run, types: [WARNING] # git bisect good 284e67a93b8c48952b6fc82129a8d3eb9dc73b06 3d3abf3f7e8b1abb082070a343de82d7efc80523 is the first bad commit commit 3d3abf3f7e8b1abb082070a343de82d7efc80523 Author: Sean Christopherson Date: Tue Jul 15 12:06:38 2025 -0700 KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O commit e750f85391286a4c8100275516973324b621a269 upstream. When completing emulation of instruction that generated a userspace exit for I/O, don't recheck L1 intercepts as KVM has already finished that phase of instruction execution, i.e. has already committed to allowing L2 to perform I/O. If L1 (or host userspace) modifies the I/O permission bitmaps during the exit to userspace, KVM will treat the access as being intercepted despite already having emulated the I/O access. Pivot on EMULTYPE_NO_DECODE to detect that KVM is completing emulation. Of the three users of EMULTYPE_NO_DECODE, only complete_emulated_io() (the intended "recipient") can reach the code in question. gp_interception()'s use is mutually exclusive with is_guest_mode(), and complete_emulated_insn_gp() unconditionally pairs EMULTYPE_NO_DECODE with EMULTYPE_SKIP. The bad behavior was detected by a syzkaller program that toggles port I/O interception during the userspace I/O exit, ultimately resulting in a WARN on vcpu->arch.pio.count being non-zero due to KVM no completing emulation of the I/O instruction. WARNING: CPU: 23 PID: 1083 at arch/x86/kvm/x86.c:8039 emulator_pio_in_out+0x154/0x170 [kvm] Modules linked in: kvm_intel kvm irqbypass CPU: 23 UID: 1000 PID: 1083 Comm: repro Not tainted 6.16.0-rc5-c1610d2d66b1-next-vm #74 NONE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:emulator_pio_in_out+0x154/0x170 [kvm] PKRU: 55555554 Call Trace: kvm_fast_pio+0xd6/0x1d0 [kvm] vmx_handle_exit+0x149/0x610 [kvm_intel] kvm_arch_vcpu_ioctl_run+0xda8/0x1ac0 [kvm] kvm_vcpu_ioctl+0x244/0x8c0 [kvm] __x64_sys_ioctl+0x8a/0xd0 do_syscall_64+0x5d/0xc60 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Reported-by: syzbot+cc2032ba16cc2018ca25@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/68790db4.a00a0220.3af5df.0020.GAE@google.com Fixes: 8a76d7f25f8f ("KVM: x86: Add x86 callback for intercept check") Cc: stable@vger.kernel.org Cc: Jim Mattson Link: https://lore.kernel.org/r/20250715190638.1899116-1-seanjc@google.com Signed-off-by: Sean Christopherson Signed-off-by: Greg Kroah-Hartman arch/x86/kvm/emulate.c | 9 ++++----- arch/x86/kvm/kvm_emulate.h | 3 +-- arch/x86/kvm/x86.c | 15 ++++++++------- 3 files changed, 13 insertions(+), 14 deletions(-) accumulated error probability: 0.00 culprit signature: c58ec073d090b7c4fc8ddcf61a99f58017d55bbe802b0c2fa1b99ab36e7cc894 parent signature: 7df751e2bd73416c7c6c0f78b5a0580673687fa2670f4a5ac265bc559e098ad7 revisions tested: 17, total time: 4h34m28.747264194s (build: 2h29m25.13532524s, test: 1h56m4.191453618s) first good commit: 3d3abf3f7e8b1abb082070a343de82d7efc80523 KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O recipients (to): ["gregkh@linuxfoundation.org" "seanjc@google.com"] recipients (cc): []