ci2 starts bisection 2025-05-19 04:50:57.308357835 +0000 UTC m=+200037.397787036 bisecting cause commit starting from a5806cd506af5a7c19bcd596e4708b5c464bfd21 building syzkaller on f41472b03ad1c28c33fa0dcb999ded4c60d1247d ensuring issue is reproducible on original commit a5806cd506af5a7c19bcd596e4708b5c464bfd21 testing commit a5806cd506af5a7c19bcd596e4708b5c464bfd21 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: bdc9efae85f7eb8d60a7c0513159fef7c8db77190b010d16da9f8e7287320ef4 all runs: crashed: INFO: task hung in lock_two_directories representative crash: INFO: task hung in lock_two_directories, types: [HANG] check whether we can drop unnecessary instrumentation disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit a5806cd506af5a7c19bcd596e4708b5c464bfd21 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 38672d855942ee78e070d3760f474891d7d81f6443f0f19c900f62bce67af6b7 all runs: crashed: INFO: task hung in lock_two_directories representative crash: INFO: task hung in lock_two_directories, types: [HANG] the bug reproduces without the instrumentation disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed kconfig minimization: base=4080 full=8322 leaves diff=2130 split chunks (needed=false): <2130> split chunk #0 of len 2130 into 5 parts testing without sub-chunk 1/5 disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed testing commit a5806cd506af5a7c19bcd596e4708b5c464bfd21 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: ed4f3bf8196639263fd9f2ef5fc18e250b88dac58c15e74737ba43a57ff0bbd2 all runs: crashed: INFO: task hung in lock_two_directories representative crash: INFO: task hung in lock_two_directories, types: [HANG] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP LEAK UBSAN BUG], they are not needed testing commit a5806cd506af5a7c19bcd596e4708b5c464bfd21 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 failed building a5806cd506af5a7c19bcd596e4708b5c464bfd21: ld.lld: error: undefined symbol: devm_drm_of_get_bridge testing without sub-chunk 3/5 disabling configs for [BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK UBSAN], they are not needed testing commit a5806cd506af5a7c19bcd596e4708b5c464bfd21 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 9ad177788b10c068cbf9dc347f618e68e5f8f64da6f512c82ac5a115519fe737 all runs: crashed: INFO: task hung in lock_two_directories representative crash: INFO: task hung in lock_two_directories, types: [HANG] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [LOCKDEP ATOMIC_SLEEP LEAK UBSAN BUG KASAN], they are not needed testing commit a5806cd506af5a7c19bcd596e4708b5c464bfd21 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 1ad79e6da2de17b5b0897dbd5f77bf8c7d3c594446a4bb197a57155bd28a8c87 all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed testing commit a5806cd506af5a7c19bcd596e4708b5c464bfd21 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 5420ef1044046c05e1e784330b59e29ba50219fade32947f9d026dcd9396eeb9 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: BUG: soft lockup in sys_openat run #9: crashed: BUG: soft lockup in sys_openat representative crash: INFO: rcu detected stall in corrupted, types: [HANG] the chunk can be dropped minimized to 426 configs; suspects: [6LOWPAN ARCH_ENABLE_MEMORY_HOTREMOVE ASUS_WMI CHARGER_BQ24190 CMA COMMON_CLK DAX DLM DRM DRM_BRIDGE DRM_DEBUG_MM DRM_DISPLAY_DP_AUX_BUS DRM_DISPLAY_DP_HELPER DRM_DISPLAY_DSC_HELPER DRM_DISPLAY_HDCP_HELPER DRM_DISPLAY_HDMI_HELPER DRM_DISPLAY_HELPER DRM_GEM_SHMEM_HELPER 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 EVM_EXTRA_SMACK_XATTRS 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 HAS_LTO_CLANG 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 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_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 IO_URING_ZCRX 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_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 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 PAGE_POOL 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 [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed picked [v6.14 v6.13 v6.12 v6.10 v6.8 v6.6 v6.4 v6.2 v5.19 v5.16 v5.13 v5.10 v5.7 v5.4 v5.1 v4.19] out of 37 release tags testing release v6.14 testing commit 38fec10eb60d687e30c8c6b5420d86e8149f7557 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: ca0f1ddb24d45381bb4508e2be35eae6ef94be481a2086f64727206776fc07bb all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] testing release v6.13 testing commit ffd294d346d185b70e28b1a28abe367bbfe53c04 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 1621d8176903a49bdf14be03efefb3a29665e79afc7d6c068c0f4cd5638add40 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: BUG: soft lockup in sys_openat run #9: crashed: BUG: soft lockup in sys_openat representative crash: INFO: rcu detected stall in corrupted, types: [HANG] testing release v6.12 testing commit adc218676eef25575469234709c2d87185ca223a gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: f4a5f42b775acf4a155700e2c34081a090019036bfe5b2674b018607ce62b1be all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] testing release v6.10 testing commit 0c3836482481200ead7b416ca80c68a29cfdaabd gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 2cfd28803343c12258ea2651f9b76f8bed3ca8a0eccc0842267662c21c138c1a all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] testing release v6.8 testing commit e8f897f4afef0031fe618a8e94127a0934896aba gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: dac5c59c572df43dd046f1e2ffc8f85e2a72c88570a2ef595f22bee03ab5f4c9 all runs: OK false negative chance: 0.000 # git bisect start 0c3836482481200ead7b416ca80c68a29cfdaabd e8f897f4afef0031fe618a8e94127a0934896aba Bisecting: 15131 revisions left to test after this (roughly 14 steps) [63407d3081a6b406d94bd7d96ff2ca38fa7df236] Merge tag 'phy-fixes-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy testing commit 63407d3081a6b406d94bd7d96ff2ca38fa7df236 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: d4e0d386fff6e34db8a5c86a5323f96ebe8e645f186584ed28639489b36e0621 all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect bad 63407d3081a6b406d94bd7d96ff2ca38fa7df236 Bisecting: 7033 revisions left to test after this (roughly 13 steps) [480e035fc4c714fb5536e64ab9db04fedc89e910] Merge tag 'drm-next-2024-03-13' of https://gitlab.freedesktop.org/drm/kernel testing commit 480e035fc4c714fb5536e64ab9db04fedc89e910 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 20f1b09a21120dac11be05497bfb79918dd34b5e288dd1457fe86b030d116289 all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect bad 480e035fc4c714fb5536e64ab9db04fedc89e910 Bisecting: 2870 revisions left to test after this (roughly 12 steps) [9187210eee7d87eea37b45ea93454a88681894a4] Merge tag 'net-next-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next testing commit 9187210eee7d87eea37b45ea93454a88681894a4 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 4cdc6b5955249d7ea00b224a0bc4f46cba4d892f5a9533943198f16839bbc35d all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect bad 9187210eee7d87eea37b45ea93454a88681894a4 Bisecting: 2600 revisions left to test after this (roughly 11 steps) [a01c9fe32378636ae65bec8047b5de3fdb2ba5c8] Merge tag 'nfsd-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux testing commit a01c9fe32378636ae65bec8047b5de3fdb2ba5c8 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: f6ba4bac5c84a29ba4c1810d13781567aae77b580f668f42dd43cbeb14000047 all runs: OK false negative chance: 0.000 # git bisect good a01c9fe32378636ae65bec8047b5de3fdb2ba5c8 Bisecting: 1299 revisions left to test after this (roughly 10 steps) [ca61ba3885274a684c83d8a538eb77b30e38ee92] Merge branch 'rework-genet-mdioclocking' testing commit ca61ba3885274a684c83d8a538eb77b30e38ee92 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: a9339520b0eb680a840438427962431dd1bad300cda260bfa6eb7b40ef89bc0d all runs: OK false negative chance: 0.000 # git bisect good ca61ba3885274a684c83d8a538eb77b30e38ee92 Bisecting: 649 revisions left to test after this (roughly 9 steps) [45340097ce6ea7e875674a5a7d24c95ecbc93ef9] Bluetooth: hci_conn: Only do ACL connections sequentially testing commit 45340097ce6ea7e875674a5a7d24c95ecbc93ef9 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: e4dd6ca7bebc0ee76799be2e144d0e9c05c9aab0973b54066acd59edb33764b5 all runs: OK false negative chance: 0.000 # git bisect good 45340097ce6ea7e875674a5a7d24c95ecbc93ef9 Bisecting: 312 revisions left to test after this (roughly 8 steps) [2f901582f032bed47907a20f77fb44b3532b4762] Merge tag 'for-net-next-2024-03-08' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next testing commit 2f901582f032bed47907a20f77fb44b3532b4762 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: efd3156a1eaeb9ea176654c06119107a516891589dfbf0ab870b415dbc6ad4e5 all runs: OK false negative chance: 0.000 # git bisect good 2f901582f032bed47907a20f77fb44b3532b4762 Bisecting: 156 revisions left to test after this (roughly 7 steps) [5f20e6ab1f65aaaaae248e6946d5cb6d039e7de8] Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next testing commit 5f20e6ab1f65aaaaae248e6946d5cb6d039e7de8 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: c39b49880c57899357c112dbb5d0428cb5c6e35d8f88734b9dc7d46d5e250b4d all runs: OK false negative chance: 0.000 # git bisect good 5f20e6ab1f65aaaaae248e6946d5cb6d039e7de8 Bisecting: 79 revisions left to test after this (roughly 6 steps) [681ba318a635787031537b3a7df5c12980835cb1] Merge tag 'Smack-for-6.9' of https://github.com/cschaufler/smack-next testing commit 681ba318a635787031537b3a7df5c12980835cb1 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: b9b7fa45cac58d978c6b23e81364f0eddce6121a9e2611ebe8208212ff309c36 all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect bad 681ba318a635787031537b3a7df5c12980835cb1 Bisecting: 38 revisions left to test after this (roughly 5 steps) [57914905f3ff2212a949e7191d52d9994c2c6215] kernel.h: Move lib/cmdline.c prototypes to string.h testing commit 57914905f3ff2212a949e7191d52d9994c2c6215 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 6a2df3636818ebf06f32c3e1ae563dbd8f421e12107f3f6a03a5dc37ae1576ce all runs: OK false negative chance: 0.000 # git bisect good 57914905f3ff2212a949e7191d52d9994c2c6215 Bisecting: 25 revisions left to test after this (roughly 4 steps) [3fe1eb4dd2e4b872ffb7b9b081b34ffcfa934ba7] selftests/powerpc: Fix load_unaligned_zeropad build failure testing commit 3fe1eb4dd2e4b872ffb7b9b081b34ffcfa934ba7 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 1fbb717d42a1f050f7d44d2b36ca112487ded06260d19905d67f58ab0ce4def7 all runs: OK false negative chance: 0.000 # git bisect good 3fe1eb4dd2e4b872ffb7b9b081b34ffcfa934ba7 Bisecting: 12 revisions left to test after this (roughly 4 steps) [216532e147b2fee6ee830f4a844bbc3cbb9137af] Merge tag 'hardening-v6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux testing commit 216532e147b2fee6ee830f4a844bbc3cbb9137af gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 6246bfbf21c77d6766fc4cb7822ed1acdeeb0e760e2f565c13896fe90c6fb60e all runs: OK false negative chance: 0.000 # git bisect good 216532e147b2fee6ee830f4a844bbc3cbb9137af Bisecting: 6 revisions left to test after this (roughly 3 steps) [69b6d71052b54fb10feba68564ccb41c0f0ce1e9] Smack: use init_task_smack() in smack_cred_transfer() testing commit 69b6d71052b54fb10feba68564ccb41c0f0ce1e9 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 577fbb79bd79cb615e67739cc1935f652ef2a246712c5c96631293260bbc18de all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect bad 69b6d71052b54fb10feba68564ccb41c0f0ce1e9 Bisecting: 2 revisions left to test after this (roughly 2 steps) [51b15e7990cb5ac42c3aba82f46e1d95e0dd2310] smack: Always determine inode labels in smack_inode_init_security() testing commit 51b15e7990cb5ac42c3aba82f46e1d95e0dd2310 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 3e41d1ee5fd439584d3f0e3c83e4f744d2d7c91be5a04ff24f64858a1dd07c6a all runs: OK false negative chance: 0.000 # git bisect good 51b15e7990cb5ac42c3aba82f46e1d95e0dd2310 Bisecting: 0 revisions left to test after this (roughly 1 step) [f0816d4332c3f764cd42cf8124a193e17eeccba9] ramfs: Initialize security of in-memory inodes testing commit f0816d4332c3f764cd42cf8124a193e17eeccba9 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 661ee636f3042d07776660c2772924a0fdf0545d79a7e99ff1a7a3a1a1f8c114 all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect bad f0816d4332c3f764cd42cf8124a193e17eeccba9 Bisecting: 0 revisions left to test after this (roughly 0 steps) [e63d86b8b76437815fc040e8e65da257c28ba922] smack: Initialize the in-memory inode in smack_inode_init_security() testing commit e63d86b8b76437815fc040e8e65da257c28ba922 gcc compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 kernel signature: 8df12cbfcf3f35b77900a2e8196d44b7694c098ffa5be922e906ff10eaaa079b all runs: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect bad e63d86b8b76437815fc040e8e65da257c28ba922 e63d86b8b76437815fc040e8e65da257c28ba922 is the first bad commit commit e63d86b8b76437815fc040e8e65da257c28ba922 Author: Roberto Sassu Date: Thu Nov 16 10:01:24 2023 +0100 smack: Initialize the in-memory inode in smack_inode_init_security() Currently, Smack initializes in-memory new inodes in three steps. It first sets the xattrs in smack_inode_init_security(), fetches them in smack_d_instantiate() and finally, in the same function, sets the in-memory inodes depending on xattr values, unless they are in specially-handled filesystems. Other than being inefficient, this also prevents filesystems not supporting xattrs from working properly since, without xattrs, there is no way to pass the label determined in smack_inode_init_security() to smack_d_instantiate(). Since the LSM infrastructure allows setting and getting the security field without xattrs through the inode_setsecurity and inode_getsecurity hooks, make the inode creation work too, by initializing the in-memory inode earlier in smack_inode_init_security(). Also mark the inode as instantiated, to prevent smack_d_instantiate() from overwriting the security field. As mentioned above, this potentially has impact for inodes in specially-handled filesystems in smack_d_instantiate(), if they are not handled in the same way in smack_inode_init_security(). Filesystems other than tmpfs don't call security_inode_init_security(), so they would be always initialized in smack_d_instantiate(), as before. For tmpfs, the current behavior is to assign to inodes the label '*', but actually that label is overwritten with the one fetched from the SMACK64 xattr, set in smack_inode_init_security() (default: '_'). Initializing the in-memory inode is straightforward: if not transmuting, nothing more needs to be done; if transmuting, overwrite the current inode label with the one from the parent directory, and set SMK_INODE_TRANSMUTE. Finally, set SMK_INODE_INSTANT for all cases, to mark the inode as instantiated. Signed-off-by: Roberto Sassu Signed-off-by: Casey Schaufler security/smack/smack_lsm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) accumulated error probability: 0.00 culprit signature: 8df12cbfcf3f35b77900a2e8196d44b7694c098ffa5be922e906ff10eaaa079b parent signature: 3e41d1ee5fd439584d3f0e3c83e4f744d2d7c91be5a04ff24f64858a1dd07c6a revisions tested: 27, total time: 6h20m14.78114166s (build: 2h7m51.085687573s, test: 3h54m20.245020143s) first bad commit: e63d86b8b76437815fc040e8e65da257c28ba922 smack: Initialize the in-memory inode in smack_inode_init_security() recipients (to): ["casey@schaufler-ca.com" "roberto.sassu@huawei.com"] recipients (cc): [] crash: INFO: rcu detected stall in corrupted rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10002 jiffies, g=3369, q=743 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10001 (4294955517-4294945516), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10002 jiffies! g3369 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:14592 pid:16 tgid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x624/0x9d0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0xab/0x110 kernel/sched/core.c:6817 schedule_timeout+0x107/0x170 kernel/time/timer.c:2183 rcu_gp_fqs_loop+0x17a/0x580 kernel/rcu/tree.c:1631 rcu_gp_kthread+0x1c/0x110 kernel/rcu/tree.c:1830 kthread+0xe8/0x100 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 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3499 Comm: syz.3.16 Not tainted 6.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:lock_acquire+0x112/0x1c0 kernel/locking/lockdep.c:5757 Code: 48 c7 c7 e0 e9 e9 82 e8 9c a5 46 01 65 c7 05 b1 d4 f1 7e 00 00 00 00 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 <75> 33 f7 44 24 08 00 02 00 00 74 01 fb 48 83 c4 10 5b 41 5c 41 5d RSP: 0018:ffffc900027937a8 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000246 RCX: 0000000000000000 RDX: ab77142d0de484c9 RSI: ffffffff82fe8baf RDI: ffffffff82f2abb5 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000018 R10: 0000000000000003 R11: ffffffff8144cdd0 R12: ffffffff833d9688 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fb5c857c6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556bc74a8 CR3: 0000000106f94000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] rcu_read_lock include/linux/rcupdate.h:750 [inline] ext4_update_other_inodes_time fs/ext4/inode.c:5064 [inline] ext4_do_update_inode fs/ext4/inode.c:5117 [inline] ext4_mark_iloc_dirty+0x1b6/0x5e0 fs/ext4/inode.c:5739 __ext4_mark_inode_dirty+0x182/0x200 fs/ext4/inode.c:5943 ext4_dirty_inode+0x5f/0x80 fs/ext4/inode.c:5972 __mark_inode_dirty+0xb7/0x3c0 fs/fs-writeback.c:2452 mark_inode_dirty_sync include/linux/fs.h:2388 [inline] dquot_free_space include/linux/quotaops.h:380 [inline] dquot_free_block include/linux/quotaops.h:390 [inline] ext4_xattr_block_set+0x6b4/0xcd0 fs/ext4/xattr.c:2103 ext4_xattr_set_handle+0x4f9/0x710 fs/ext4/xattr.c:2456 ext4_initxattrs+0x38/0x60 fs/ext4/xattr_security.c:44 security_inode_init_security+0x115/0x180 security/security.c:1752 __ext4_new_inode+0x114c/0x1340 fs/ext4/ialloc.c:1326 ext4_create+0xab/0x190 fs/ext4/namei.c:2831 lookup_open fs/namei.c:3496 [inline] open_last_lookups fs/namei.c:3565 [inline] path_openat+0x59e/0xd30 fs/namei.c:3795 do_filp_open+0x9e/0x120 fs/namei.c:3825 do_sys_openat2+0x6d/0xb0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __x64_sys_openat+0x6e/0x80 fs/open.c:1430 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fb5c778e969 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:00007fb5c857c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fb5c79b5fa0 RCX: 00007fb5c778e969 RDX: 0000000000101042 RSI: 0000200000000140 RDI: ffffffffffffff9c RBP: 00007fb5c7810ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb5c79b5fa0 R15: 00007ffd74d47918