ci starts bisection 2025-02-17 23:07:09.80224373 +0000 UTC m=+31130.343675285 bisecting cause commit starting from 253c82b3a2cec22bf9db65645f934fbe095899a3 building syzkaller on 9be4ace34ffed29b36f379311c49249a457dabf3 ensuring issue is reproducible on original commit 253c82b3a2cec22bf9db65645f934fbe095899a3 testing commit 253c82b3a2cec22bf9db65645f934fbe095899a3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6678461eb6c33838891ddd596b801fbc6eaac8fa5cc08634d9909c5fb92086fe all runs: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry representative crash: WARNING: suspicious RCU usage in kernfs_node_dentry, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit 253c82b3a2cec22bf9db65645f934fbe095899a3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 51c7d00553f13fbd511baa1d3574c26a05bd04c533c867ecae8843968936c2de all runs: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry representative crash: WARNING: suspicious RCU usage in kernfs_node_dentry, 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=4062 full=8263 leaves diff=2119 split chunks (needed=false): <2119> split chunk #0 of len 2119 into 5 parts testing without sub-chunk 1/5 disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 253c82b3a2cec22bf9db65645f934fbe095899a3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8d5b9950607df0b83e3ac688e062c178fa890e0104c10d88d636a5d1ae86bbf2 all runs: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry representative crash: WARNING: suspicious RCU usage in kernfs_node_dentry, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 253c82b3a2cec22bf9db65645f934fbe095899a3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 failed building 253c82b3a2cec22bf9db65645f934fbe095899a3: drivers/gpu/drm/bridge/aux-bridge.c:116: undefined reference to `devm_drm_of_get_bridge' testing without sub-chunk 3/5 disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 253c82b3a2cec22bf9db65645f934fbe095899a3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c6f9448584e02a7e31c33d02a725f21d7b3c226e5821e4f8c6ff9c0e0254b512 all runs: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry representative crash: WARNING: suspicious RCU usage in kernfs_node_dentry, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [LEAK UBSAN BUG KASAN ATOMIC_SLEEP HANG], they are not needed testing commit 253c82b3a2cec22bf9db65645f934fbe095899a3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 498f27e359f6d8c6fee54d9d315b74668fb6f4134114fc6474825e89c7c33c27 all runs: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry representative crash: WARNING: suspicious RCU usage in kernfs_node_dentry, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP HANG LEAK], they are not needed testing commit 253c82b3a2cec22bf9db65645f934fbe095899a3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0a8de888070c48b400646f71444090c36c19aad7f4d50c8529c86408586cfdb1 all runs: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry representative crash: WARNING: suspicious RCU usage in kernfs_node_dentry, types: [LOCKDEP] the chunk can be dropped minimized to 424 configs; suspects: [6LOWPAN ARCH_ENABLE_MEMORY_HOTREMOVE ASUS_WMI CHARGER_BQ24190 CMA COMMON_CLK DAX DLM DRM DRM_BRIDGE DRM_GM12U320 DRM_GUD DRM_I915 DRM_I915_CAPTURE_ERROR DRM_I915_COMPRESS_ERROR DRM_I915_USERPTR DRM_KMS_HELPER DRM_MIPI_DSI DRM_PANEL DRM_PANEL_BRIDGE DRM_PANEL_EDP DRM_PANEL_ORIENTATION_QUIRKS DRM_SIMPLEDRM DRM_TTM DRM_TTM_HELPER DRM_UDL DRM_VGEM DRM_VIRTIO_GPU DRM_VIRTIO_GPU_KMS DRM_VKMS DRM_VMWGFX DUMMY DVB_AF9013 DVB_AF9033 DVB_AS102 DVB_AS102_FE DVB_B2C2_FLEXCOP DVB_B2C2_FLEXCOP_USB DVB_CORE DVB_DIB3000MB DVB_DIB3000MC DVB_EC100 DVB_GP8PSK_FE DVB_RTL2830 DVB_RTL2832 DVB_RTL2832_SDR DVB_TEST_DRIVERS DVB_TTUSB_BUDGET DVB_TTUSB_DEC DVB_USB DVB_USB_A800 DVB_USB_AF9005 DVB_USB_AF9005_REMOTE DVB_USB_AF9015 DVB_USB_AF9035 DVB_USB_ANYSEE DVB_USB_AU6610 DVB_USB_AZ6007 DVB_USB_AZ6027 DVB_USB_CE6230 DVB_USB_CINERGY_T2 DVB_USB_CXUSB DVB_USB_CXUSB_ANALOG DVB_USB_DIB0700 DVB_USB_DIB3000MC DVB_USB_DIBUSB_MB DVB_USB_DIBUSB_MC DVB_USB_DIGITV DVB_USB_DTT200U DVB_USB_DTV5100 DVB_USB_DVBSKY DVB_USB_DW2102 DVB_USB_EC168 DVB_USB_GL861 DVB_USB_GP8PSK DVB_USB_LME2510 DVB_USB_M920X DVB_USB_MXL111SF DVB_USB_NOVA_T_USB2 DVB_USB_OPERA1 DVB_USB_PCTV452E DVB_USB_RTL28XXU DVB_USB_TECHNISAT_USB2 DVB_USB_TTUSB2 DVB_USB_UMT_010 DVB_USB_V2 DVB_USB_VP702X DVB_USB_VP7045 DVB_USB_ZD1301 DVB_VIDTV DVB_ZL10353 ECRYPT_FS ECRYPT_FS_MESSAGING EDAC EFS_FS ENCRYPTED_KEYS EQUALIZER EROFS_FS EROFS_FS_POSIX_ACL EROFS_FS_SECURITY EROFS_FS_XATTR EROFS_FS_ZIP EVM EVM_ADD_XATTRS EVM_ATTR_FSUUID EXFAT_FS EXPORTFS_BLOCK_OPS EXT3_FS EXT3_FS_POSIX_ACL EXT3_FS_SECURITY EXTCON EXTCON_INTEL_CHT_WC EXTCON_PTN5150 EXTCON_USBC_TUSB320 F2FS_CHECK_FS F2FS_FAULT_INJECTION F2FS_FS F2FS_FS_COMPRESSION F2FS_FS_LZ4 F2FS_FS_LZ4HC F2FS_FS_LZO F2FS_FS_LZORLE F2FS_FS_POSIX_ACL F2FS_FS_SECURITY F2FS_FS_XATTR F2FS_FS_ZSTD F2FS_STAT_FS FANOTIFY FANOTIFY_ACCESS_PERMISSIONS FB FB_CFB_COPYAREA FB_CFB_FILLRECT FB_CFB_IMAGEBLIT FB_CORE FB_DEFERRED_IO FB_DEVICE FB_IOMEM_FOPS FB_IOMEM_HELPERS FB_NOTIFY FB_SYSMEM_FOPS FB_SYSMEM_HELPERS FB_SYSMEM_HELPERS_DEFERRED FB_SYS_COPYAREA FB_SYS_FILLRECT FB_SYS_IMAGEBLIT FB_TILEBLITTING FB_VESA FB_VGA16 FB_VIRTUAL FDDI FIREWIRE FIREWIRE_NET FIREWIRE_OHCI FIREWIRE_SBP2 FONT_8x16 FONT_8x8 FONT_SUPPORT FRAMEBUFFER_CONSOLE FRAMEBUFFER_CONSOLE_DETECT_PRIMARY FRAMEBUFFER_CONSOLE_ROTATION FS_DAX FS_DAX_PMD FS_ENCRYPTION FS_ENCRYPTION_ALGS FS_STACK FS_VERITY FS_VERITY_BUILTIN_SIGNATURES FTL FUSE_DAX FUSE_FS FW_LOADER_COMPRESS FW_LOADER_PAGED_BUF FW_LOADER_SYSFS FW_LOADER_USER_HELPER FW_LOADER_USER_HELPER_FALLBACK GACT_PROB GARP GENDWARFKSYMS GENERIC_PHY GET_FREE_REGION GFS2_FS GFS2_FS_LOCKING_DLM GNSS GNSS_USB GOOGLE_COREBOOT_TABLE GOOGLE_FIRMWARE GOOGLE_MEMCONSOLE GOOGLE_MEMCONSOLE_COREBOOT GOOGLE_VPD GPIOLIB GPIOLIB_IRQCHIP GPIO_ACPI GPIO_DLN2 GPIO_LJCA GPIO_VIPERBOARD GREENASIA_FF GREYBUS GREYBUS_BRIDGED_PHY GREYBUS_ES2 GREYBUS_HID GREYBUS_USB GTP GUEST_PERF_EVENTS GVE HARDENED_USERCOPY_DEFAULT_ON HAVE_ARCH_NODE_DEV_GROUP HAVE_ARCH_USERFAULTFD_MINOR HAVE_ARCH_USERFAULTFD_WP HAVE_BOOTMEM_INFO_NODE HAVE_CLK_PREPARE HAVE_KVM_CPU_RELAX_INTERCEPT HAVE_KVM_DIRTY_RING HAVE_KVM_DIRTY_RING_ACQ_REL HAVE_KVM_DIRTY_RING_TSO HAVE_KVM_IRQCHIP HAVE_KVM_IRQ_BYPASS HAVE_KVM_IRQ_ROUTING HAVE_KVM_MSI HAVE_KVM_NO_POLL HAVE_KVM_PFNCACHE HAVE_KVM_PM_NOTIFIER HAVE_KVM_READONLY_MEM HAVE_SCHED_AVG_IRQ HDLC HDLC_CISCO HDLC_FR HDLC_PPP HDLC_RAW HDLC_RAW_ETH HDLC_X25 HDMI HFSPLUS_FS HFS_FS HID_ACCUTOUCH HID_ACRUX HID_ACRUX_FF HID_ALPS HID_APPLEIR HID_ASUS HID_AUREAL HID_BATTERY_STRENGTH HID_BETOP_FF HID_BIGBEN_FF HID_CMEDIA HID_CORSAIR HID_COUGAR HID_CP2112 HID_CREATIVE_SB0540 HID_ELAN HID_ELECOM HID_ELO HID_EMS_FF HID_EVISION HID_FT260 HID_GEMBIRD HID_GFRM HID_GLORIOUS HID_GOOGLE_STADIA_FF HID_GREENASIA HID_GT683R HID_HOLTEK HID_ICADE HID_JABRA HID_KEYTOUCH HID_KYE HID_LCPOWER HID_LED HID_LENOVO HID_LETSKETCH HID_LOGITECH_DJ HID_LOGITECH_HIDPP HID_MACALLY HID_MAGICMOUSE HID_MALTRON HID_MAYFLASH HID_MCP2200 HID_MCP2221 HID_MEGAWORLD_FF HID_MULTITOUCH HID_NTI HID_ORTEK HID_PENMOUNT HID_PICOLCD HID_PICOLCD_BACKLIGHT HID_PICOLCD_CIR HID_PICOLCD_FB HID_PICOLCD_LCD HID_PICOLCD_LEDS HID_PLANTRONICS HID_PRIMAX HID_PRODIKEYS HID_PXRC HID_RAZER HID_RETRODE HID_RMI HID_ROCCAT HID_SAITEK HID_SEMITEK HID_SENSOR_ACCEL_3D HID_SENSOR_ALS HID_SENSOR_CUSTOM_INTEL_HINGE HID_SENSOR_CUSTOM_SENSOR HID_SENSOR_DEVICE_ROTATION HID_SENSOR_GYRO_3D HID_SENSOR_HUB HID_SENSOR_HUMIDITY HID_SENSOR_IIO_COMMON HID_SENSOR_IIO_TRIGGER HID_SENSOR_INCLINOMETER_3D HID_SENSOR_MAGNETOMETER_3D HID_SENSOR_PRESS HID_SENSOR_PROX HID_SENSOR_TEMP HID_SIGMAMICRO HID_SPEEDLINK HID_STEELSERIES HID_THINGM HID_TIVO HID_TOPRE HID_TWINHAN HID_U2FZERO HID_UCLOGIC HID_UDRAW_PS3 HID_VIEWSONIC HID_VIVALDI HID_VIVALDI_COMMON HID_VRC2 HID_WACOM HID_WALTOP HID_WIIMOTE HID_XIAOMI HID_XINMO HID_ZYDACRON HMM_MIRROR HOLTEK_FF HOTPLUG_PCI_PCIE HPET_MMAP HPET_MMAP_DEFAULT HPFS_FS I2C_ALGOBIT I2C_CHARDEV I2C_CP2615 I2C_DESIGNWARE_CORE I2C_DESIGNWARE_PLATFORM I2C_DIOLAN_U2C I2C_DLN2 I2C_HID_ACPI I2C_HID_CORE I2C_HID_OF I2C_LJCA I2C_MUX I2C_MUX_REG I2C_ROBOTFUZZ_OSIF I2C_SI4713 I2C_SLAVE I2C_SLAVE_EEPROM I2C_TINY_USB I2C_VIPERBOARD IEEE802154 IEEE802154_6LOWPAN IEEE802154_ATUSB IEEE802154_DRIVERS IEEE802154_HWSIM IEEE802154_NL802154_EXPERIMENTAL IEEE802154_SOCKET IFB IIO IIO_BUFFER IIO_KFIFO_BUF IIO_TRIGGER IIO_TRIGGERED_BUFFER IKCONFIG IKCONFIG_PROC IMA IMA_APPRAISE IMA_APPRAISE_MODSIG IMA_DEFAULT_HASH_SHA256 IMA_LSM_RULES IMA_MEASURE_ASYMMETRIC_KEYS IMA_NG_TEMPLATE IMA_QUEUE_EARLY_BOOT_KEYS IMA_READ_POLICY IMA_WRITE_POLICY INET6_ESPINTCP INET6_ESP_OFFLOAD INET6_IPCOMP INET6_TUNNEL INET6_XFRM_TUNNEL INET_AH INET_DCCP_DIAG INET_DIAG INET_DIAG_DESTROY INET_ESP INET_ESPINTCP INET_ESP_OFFLOAD INET_IPCOMP INET_MPTCP_DIAG INET_RAW_DIAG INET_SCTP_DIAG INET_TCP_DIAG INET_UDP_DIAG INET_XFRM_TUNNEL INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_ADDR_TRANS_CONFIGFS INFINIBAND_IPOIB INFINIBAND_IPOIB_CM INFINIBAND_IPOIB_DEBUG INFINIBAND_ISER INFINIBAND_ON_DEMAND_PAGING INFINIBAND_RTRS INFINIBAND_SRP INFINIBAND_USER_ACCESS INFINIBAND_USER_MAD INFINIBAND_USER_MEM INPUT_ATI_REMOTE2 INPUT_CM109 INPUT_IMS_PCU INPUT_JOYDEV INPUT_KEYSPAN_REMOTE INPUT_LEDS INPUT_MOUSEDEV INPUT_MOUSEDEV_PSAUX INPUT_POWERMATE INPUT_UINPUT INPUT_YEALINK INTEGRITY INTEGRITY_ASYMMETRIC_KEYS INTEGRITY_AUDIT INTEGRITY_SIGNATURE INTEGRITY_TRUSTED_KEYRING INTEL_CHTWC_INT33FE INTEL_IDMA64 INTEL_IOATDMA INTEL_IOMMU_DEFAULT_ON INTEL_IOMMU_SVM INTEL_ISHTP_ECLITE INTEL_ISH_FIRMWARE_DOWNLOADER INTEL_ISH_HID INTEL_SOC_PMIC_CHTWC INTERVAL_TREE_SPAN_ITER IOMMUFD IOMMUFD_DRIVER IOMMUFD_DRIVER_CORE IOMMUFD_TEST IP6_NF_MATCH_AH IP6_NF_MATCH_EUI64 IP6_NF_MATCH_FRAG IP6_NF_MATCH_HL IP6_NF_MATCH_MH IP6_NF_MATCH_OPTS IP6_NF_MATCH_RPFILTER IP6_NF_MATCH_RT IP6_NF_MATCH_SRH IP6_NF_NAT IP6_NF_RAW IP6_NF_SECURITY IP6_NF_TARGET_HL IP6_NF_TARGET_MASQUERADE IP6_NF_TARGET_NPT IP6_NF_TARGET_SYNPROXY IPV6_FOU IPV6_FOU_TUNNEL IPV6_GRE IPV6_ILA IPV6_MIP6 IPV6_MROUTE IPV6_MROUTE_MULTIPLE_TABLES IPV6_MULTIPLE_TABLES IPV6_OPTIMISTIC_DAD IPV6_PIMSM_V2 IPV6_ROUTER_PREF IPV6_ROUTE_INFO IPV6_RPL_LWTUNNEL IPV6_SEG6_BPF IPV6_SEG6_HMAC IPV6_SEG6_LWTUNNEL IPV6_SIT_6RD IPV6_SUBTREES IPV6_TUNNEL IPV6_VTI IPVLAN IPVLAN_L3S IPVTAP IP_DCCP IP_DCCP_CCID3 IP_DCCP_TFRC_LIB IP_FIB_TRIE_STATS IP_MROUTE_MULTIPLE_TABLES IP_NF_ARPFILTER IP_NF_ARPTABLES IP_NF_ARP_MANGLE IP_NF_MATCH_AH IP_NF_MATCH_ECN IP_NF_MATCH_RPFILTER IP_NF_MATCH_TTL IP_NF_RAW IP_NF_SECURITY IP_NF_TARGET_ECN IP_NF_TARGET_NETMAP IP_NF_TARGET_REDIRECT IP_NF_TARGET_SYNPROXY IP_NF_TARGET_TTL IP_ROUTE_CLASSID IP_SCTP IP_SET IP_SET_BITMAP_IP IP_SET_BITMAP_IPMAC IP_SET_BITMAP_PORT IP_SET_HASH_IP IP_SET_HASH_IPMAC IP_SET_HASH_IPMARK IP_SET_HASH_IPPORT IP_SET_HASH_IPPORTIP IP_SET_HASH_IPPORTNET IP_SET_HASH_MAC IP_SET_HASH_NET IP_SET_HASH_NETIFACE IP_SET_HASH_NETNET IP_SET_HASH_NETPORT IP_SET_HASH_NETPORTNET IP_SET_LIST_SET IRQ_TIME_ACCOUNTING LAPB LCD_CLASS_DEVICE LEDS_CLASS_MULTICOLOR MAC802154 MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_TEST_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MFD_VIPERBOARD MODVERSIONS MPTCP MTD NETFILTER_ADVANCED NET_ACT_GACT NET_ACT_MIRRED NET_IPGRE_DEMUX NFT_COMPAT NFT_COMPAT_ARP NFT_FWD_NETDEV NF_TABLES NF_TABLES_ARP NF_TABLES_NETDEV RADIO_ADAPTERS RADIO_SI4713 RAS RC_CORE REGULATOR RFKILL SND SOUND STAGING TRANSPARENT_HUGEPAGE TYPEC TYPEC_MUX_PI3USB30532 USB_LJCA USB_ROLES_INTEL_XHCI USB_ROLE_SWITCH VIDEO_DEV VIRTIO_FS WAN ZONE_DEVICE] disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed picked [v6.13 v6.12 v6.11 v6.9 v6.7 v6.5 v6.3 v6.1 v5.18 v5.15 v5.12 v5.9 v5.6 v5.3 v5.0 v4.19] out of 36 release tags testing release v6.13 testing commit ffd294d346d185b70e28b1a28abe367bbfe53c04 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b825361c82105518dea57b910b60f394f61b1c10494b557de9f017ebc438e9b9 all runs: OK false negative chance: 0.000 # git bisect start 253c82b3a2cec22bf9db65645f934fbe095899a3 ffd294d346d185b70e28b1a28abe367bbfe53c04 Bisecting: 7467 revisions left to test after this (roughly 13 steps) [184a0997fb77f4a9527fc867fcd16806776c27ce] Merge tag 'media/v6.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media testing commit 184a0997fb77f4a9527fc867fcd16806776c27ce gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 427609e9a9627db7be2071189d0d65ef0240ceb705f6726d1f42fe940e5ee5b5 all runs: OK false negative chance: 0.000 # git bisect good 184a0997fb77f4a9527fc867fcd16806776c27ce Bisecting: 3751 revisions left to test after this (roughly 12 steps) [2976ccfc1c462b16c8c1325755b73448c9db4d22] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git testing commit 2976ccfc1c462b16c8c1325755b73448c9db4d22 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 36de1c0117def0c96b1c68c18839dbb85088ccc529ba0314b9d44dd92b446910 all runs: OK false negative chance: 0.000 # git bisect good 2976ccfc1c462b16c8c1325755b73448c9db4d22 Bisecting: 1975 revisions left to test after this (roughly 11 steps) [cfd60360ba24f02b9b2a09b35398e79a6996c997] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git testing commit cfd60360ba24f02b9b2a09b35398e79a6996c997 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a3dc8100224720acdc9b13f721a39cb6594e37613923a4b2ea246503adf35895 all runs: OK false negative chance: 0.000 # git bisect good cfd60360ba24f02b9b2a09b35398e79a6996c997 Bisecting: 986 revisions left to test after this (roughly 10 steps) [7d462be4bf36ba7cb1b1cad2dceedbc44b11c307] Merge branch 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/modules/linux.git testing commit 7d462be4bf36ba7cb1b1cad2dceedbc44b11c307 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 847df5aa9d5d12e115473356f8a084dcf0f4407b800a0a3cfedd1f28c4fa808d run #0: ignore: lost connection to test machine run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK false negative chance: 0.000 # git bisect good 7d462be4bf36ba7cb1b1cad2dceedbc44b11c307 Bisecting: 489 revisions left to test after this (roughly 9 steps) [edd41a7eb6742dfc1688975b437905bf3d925222] Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git testing commit edd41a7eb6742dfc1688975b437905bf3d925222 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6f335ea94d821f60c6fda1448c3b0593cc9cbced82d0694d3547b10ec82ca67e run #0: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #1: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #2: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #3: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #4: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #5: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #6: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #7: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #8: crashed: WARNING: suspicious RCU usage in kernfs_node_dentry run #9: ignore: lost connection to test machine representative crash: WARNING: suspicious RCU usage in kernfs_node_dentry, types: [LOCKDEP] # git bisect bad edd41a7eb6742dfc1688975b437905bf3d925222 Bisecting: 251 revisions left to test after this (roughly 8 steps) [c877f50ef874fdf81054983fa1d474d1e7a5ad98] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git testing commit c877f50ef874fdf81054983fa1d474d1e7a5ad98 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a0dd62cdef398b910489cf45783e0816c1f945422a090d7bfe598f58d500f127 run #0: ignore: lost connection to test machine run #1: ignore: lost connection to test machine run #2: ignore: lost connection to test machine run #3: ignore: lost connection to test machine run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK false negative chance: 0.000 # git bisect good c877f50ef874fdf81054983fa1d474d1e7a5ad98 Bisecting: 107 revisions left to test after this (roughly 7 steps) [a7626239b98f2c68e1c27b845b3d371d5b60aa61] Merge branch 'next' of https://github.com/kvm-x86/linux.git testing commit a7626239b98f2c68e1c27b845b3d371d5b60aa61 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 876b6e1a3e188963ae145773335cc18fa94ae4020e0fcb82d37d2702f8c78c6b all runs: OK false negative chance: 0.000 # git bisect good a7626239b98f2c68e1c27b845b3d371d5b60aa61 Bisecting: 68 revisions left to test after this (roughly 6 steps) [fa8a6bd5e52cc6d628c99099a2b95002445d3c95] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git testing commit fa8a6bd5e52cc6d628c99099a2b95002445d3c95 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f9ce6facd3bd7b75d46e86054a11a2d4b5a754ea63a63ab61c3a723c8b0f2a5d all runs: OK false negative chance: 0.000 # git bisect good fa8a6bd5e52cc6d628c99099a2b95002445d3c95 Bisecting: 36 revisions left to test after this (roughly 5 steps) [cc7e4556f798914a3189d32378ec3cb8593ae018] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git testing commit cc7e4556f798914a3189d32378ec3cb8593ae018 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: df38d761d59802f83f85b3cfd732e5bdf1e0433baac1032d1c3b35efcb50418e all runs: OK false negative chance: 0.000 # git bisect good cc7e4556f798914a3189d32378ec3cb8593ae018 Bisecting: 18 revisions left to test after this (roughly 4 steps) [461f24bff86808ee5fbfe74751a825f8a7ab24e0] usb: dwc3: gadget: Avoid using reserved endpoints on Intel Merrifield testing commit 461f24bff86808ee5fbfe74751a825f8a7ab24e0 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7d70e6fd2f506f5c562d50168a1b5f9f562602b496063556603845b4aaea0d4c all runs: OK false negative chance: 0.000 # git bisect good 461f24bff86808ee5fbfe74751a825f8a7ab24e0 Bisecting: 10 revisions left to test after this (roughly 3 steps) [c9f80bfbb26f5559f8d8c655200e26ad5568ce2e] Merge branch 'for-leds-next' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/leds.git testing commit c9f80bfbb26f5559f8d8c655200e26ad5568ce2e gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a8f905287c0ec988fa67c7ad2dc80cd0e07c7d26f74a851192f69062bd8c5f71 all runs: OK false negative chance: 0.000 # git bisect good c9f80bfbb26f5559f8d8c655200e26ad5568ce2e Bisecting: 5 revisions left to test after this (roughly 3 steps) [633488947ef66b194377411322dc9e12aab79b65] kernfs: Use RCU to access kernfs_node::parent. testing commit 633488947ef66b194377411322dc9e12aab79b65 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a1f6cb6b8340023aa20671abb62b01fd201801e1e02281dd217c8157f5cd7782 all runs: crashed: possible deadlock in kernfs_dop_revalidate representative crash: possible deadlock in kernfs_dop_revalidate, types: [LOCKDEP] # git bisect bad 633488947ef66b194377411322dc9e12aab79b65 Bisecting: 2 revisions left to test after this (roughly 1 step) [122ab92dee80582c39740609a627198dd5b6b595] kernfs: Acquire kernfs_rwsem in kernfs_get_parent_dentry(). testing commit 122ab92dee80582c39740609a627198dd5b6b595 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ffe6b972af6ae13134a6daf1498c3d231ee4c5cc8da5ad3fc97aed811b344123 all runs: OK false negative chance: 0.000 # git bisect good 122ab92dee80582c39740609a627198dd5b6b595 Bisecting: 0 revisions left to test after this (roughly 1 step) [9aab10a0249eab4ec77c6a5e4f66442610c12a09] kernfs: Don't re-lock kernfs_root::kernfs_rwsem in kernfs_fop_readdir(). testing commit 9aab10a0249eab4ec77c6a5e4f66442610c12a09 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a4a6e62441fbbd1a9e7bd6d930a7f159c6c95bea5875b1153daa8c7c12fff26b all runs: crashed: possible deadlock in kernfs_dop_revalidate representative crash: possible deadlock in kernfs_dop_revalidate, types: [LOCKDEP] # git bisect bad 9aab10a0249eab4ec77c6a5e4f66442610c12a09 Bisecting: 0 revisions left to test after this (roughly 0 steps) [5b2fabf7fe8f745ff214ff003e6067b64f172271] kernfs: Acquire kernfs_rwsem in kernfs_node_dentry(). testing commit 5b2fabf7fe8f745ff214ff003e6067b64f172271 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 28c34f5dbde4f4bcf556ce20bcf8bce24f20b7bf15482a0f063992df45e37a19 all runs: crashed: possible deadlock in kernfs_dop_revalidate representative crash: possible deadlock in kernfs_dop_revalidate, types: [LOCKDEP] # git bisect bad 5b2fabf7fe8f745ff214ff003e6067b64f172271 5b2fabf7fe8f745ff214ff003e6067b64f172271 is the first bad commit commit 5b2fabf7fe8f745ff214ff003e6067b64f172271 Author: Sebastian Andrzej Siewior Date: Thu Feb 13 15:50:20 2025 +0100 kernfs: Acquire kernfs_rwsem in kernfs_node_dentry(). kernfs_node_dentry() passes kernfs_node::name to lookup_positive_unlocked(). Acquire kernfs_root::kernfs_rwsem to ensure the node is not renamed during the operation. Acked-by: Tejun Heo Signed-off-by: Sebastian Andrzej Siewior Link: https://lore.kernel.org/r/20250213145023.2820193-4-bigeasy@linutronix.de Signed-off-by: Greg Kroah-Hartman fs/kernfs/mount.c | 4 ++++ 1 file changed, 4 insertions(+) accumulated error probability: 0.00 culprit signature: 28c34f5dbde4f4bcf556ce20bcf8bce24f20b7bf15482a0f063992df45e37a19 parent signature: ffe6b972af6ae13134a6daf1498c3d231ee4c5cc8da5ad3fc97aed811b344123 revisions tested: 22, total time: 7h48m4.348216238s (build: 4h21m37.379914651s, test: 2h59m55.389507051s) first bad commit: 5b2fabf7fe8f745ff214ff003e6067b64f172271 kernfs: Acquire kernfs_rwsem in kernfs_node_dentry(). recipients (to): ["bigeasy@linutronix.de" "gregkh@linuxfoundation.org" "tj@kernel.org"] recipients (cc): [] crash: possible deadlock in kernfs_dop_revalidate ============================================ WARNING: possible recursive locking detected 6.14.0-rc2-syzkaller #0 Not tainted -------------------------------------------- syz.3.16/3546 is trying to acquire lock: ffff8881006ce948 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_dop_revalidate+0x4a/0x150 fs/kernfs/dir.c:1160 but task is already holding lock: ffff8881006ce948 (&root->kernfs_rwsem){++++}-{4:4}, at: class_rwsem_read_constructor include/linux/rwsem.h:241 [inline] ffff8881006ce948 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_node_dentry+0x56/0x120 fs/kernfs/mount.c:223 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&root->kernfs_rwsem); lock(&root->kernfs_rwsem); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by syz.3.16/3546: #0: ffff888104ff0670 (&fc->uapi_mutex){+.+.}-{4:4}, at: __do_sys_fsconfig fs/fsopen.c:465 [inline] #0: ffff888104ff0670 (&fc->uapi_mutex){+.+.}-{4:4}, at: __se_sys_fsconfig+0x31e/0x4c0 fs/fsopen.c:344 #1: ffff8881053fa0e0 (&type->s_umount_key#46){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline] #1: ffff8881053fa0e0 (&type->s_umount_key#46){+.+.}-{4:4}, at: super_lock+0x11c/0x170 fs/super.c:120 #2: ffff8881006ce948 (&root->kernfs_rwsem){++++}-{4:4}, at: class_rwsem_read_constructor include/linux/rwsem.h:241 [inline] #2: ffff8881006ce948 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_node_dentry+0x56/0x120 fs/kernfs/mount.c:223 stack backtrace: CPU: 0 UID: 0 PID: 3546 Comm: syz.3.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xa3/0x100 lib/dump_stack.c:120 print_deadlock_bug+0x244/0x260 kernel/locking/lockdep.c:3039 check_deadlock kernel/locking/lockdep.c:3091 [inline] validate_chain kernel/locking/lockdep.c:3893 [inline] __lock_acquire+0x10c4/0x2570 kernel/locking/lockdep.c:5228 lock_acquire+0xeb/0x270 kernel/locking/lockdep.c:5851 down_read+0x4a/0x440 kernel/locking/rwsem.c:1524 kernfs_dop_revalidate+0x4a/0x150 fs/kernfs/dir.c:1160 d_revalidate fs/namei.c:928 [inline] lookup_dcache fs/namei.c:1656 [inline] lookup_one_unlocked+0x73/0xf0 fs/namei.c:2966 lookup_one_positive_unlocked fs/namei.c:2997 [inline] lookup_positive_unlocked+0x18/0x50 fs/namei.c:3037 kernfs_node_dentry+0xa0/0x120 fs/kernfs/mount.c:242 cgroup_do_get_tree+0x165/0x1b0 kernel/cgroup/cgroup.c:2219 cgroup_get_tree+0x33/0xe0 kernel/cgroup/cgroup.c:2258 vfs_get_tree+0x24/0xb0 fs/super.c:1814 vfs_cmd_create+0x53/0xc0 fs/fsopen.c:225 __do_sys_fsconfig fs/fsopen.c:467 [inline] __se_sys_fsconfig+0x357/0x4c0 fs/fsopen.c:344 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xa0/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb9ecf8cde9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb9edd04038 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007fb9ed1a5fa0 RCX: 00007fb9ecf8cde9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 00007fb9ed00e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb9ed1a5fa0 R15: 00007fffceb90f08