ci starts bisection 2025-03-23 12:38:10.364084363 +0000 UTC m=+20592.171038903
bisecting fixing commit since 595523945be0a5a2f12a1c04772383293fbc04a1
building syzkaller on f2cb035c8f931efff4a020b164e657f16f51934b
ensuring issue is reproducible on original commit 595523945be0a5a2f12a1c04772383293fbc04a1
testing commit 595523945be0a5a2f12a1c04772383293fbc04a1 gcc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 5e77a42d677d3e09b6d7b6e9333f7af3b7f6f31036ca2a5150051a01153e97e4
run #0: crashed: possible deadlock in n_tty_flush_buffer
run #1: crashed: possible deadlock in tty_buffer_flush
run #2: crashed: possible deadlock in tty_buffer_flush
run #3: crashed: WARNING: possible circular locking dependency detected
run #4: crashed: possible deadlock in n_tty_flush_buffer
run #5: crashed: possible deadlock in tty_buffer_flush
run #6: crashed: possible deadlock in tty_buffer_flush
run #7: crashed: possible deadlock in tty_buffer_flush
run #8: crashed: possible deadlock in tty_buffer_flush
run #9: crashed: possible deadlock in n_tty_flush_buffer
run #10: crashed: possible deadlock in tty_buffer_flush
run #11: crashed: possible deadlock in tty_buffer_flush
run #12: crashed: possible deadlock in tty_buffer_flush
run #13: crashed: possible deadlock in tty_buffer_flush
run #14: basic kernel testing failed: failed to copy binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor3619823728" "root@10.128.1.107:./syz-executor3619823728"]: exit status 255
Executing: program /usr/bin/ssh host 10.128.1.107, user root, command sftp
OpenSSH_9.2p1 Debian-2+deb12u4, OpenSSL 3.0.15 3 Sep 2024
debug1: Reading configuration data /dev/null
debug1: Connecting to 10.128.1.107 [10.128.1.107] port 22.
debug1: connect to address 10.128.1.107 port 22: Connection timed out
ssh: connect to host 10.128.1.107 port 22: Connection timed out
scp: Connection closed
run #15: crashed: possible deadlock in tty_buffer_flush
run #16: crashed: possible deadlock in n_tty_flush_buffer
run #17: OK
run #18: OK
run #19: OK
representative crash: possible deadlock in n_tty_flush_buffer, types: [LOCKDEP]
check whether we can drop unnecessary instrumentation
disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed
testing commit 595523945be0a5a2f12a1c04772383293fbc04a1 gcc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 6d7ae9e68361e69c401fed1653f9f04538a6f5fb7fd927590557979c6d2ea4f7
run #0: crashed: possible deadlock in tty_buffer_flush
run #1: crashed: possible deadlock in tty_buffer_flush
run #2: crashed: possible deadlock in tty_buffer_flush
run #3: crashed: possible deadlock in tty_buffer_flush
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
representative crash: possible deadlock in tty_buffer_flush, types: [LOCKDEP]
the bug reproduces without the instrumentation
disabling configs for [LEAK UBSAN BUG KASAN ATOMIC_SLEEP HANG], they are not needed
kconfig minimization: base=4064 full=8243 leaves diff=2122
split chunks (needed=false): <2122>
split chunk #0 of len 2122 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 595523945be0a5a2f12a1c04772383293fbc04a1 gcc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 57e844c670e8b7a0326e8b8176ac173c2904755d5a4445ad77582dfcff3e1f07
run #0: crashed: possible deadlock in n_tty_flush_buffer
run #1: crashed: possible deadlock in n_tty_flush_buffer
run #2: crashed: possible deadlock in n_tty_flush_buffer
run #3: crashed: possible deadlock in n_tty_flush_buffer
run #4: crashed: possible deadlock in n_tty_flush_buffer
run #5: crashed: possible deadlock in n_tty_receive_buf_common
run #6: crashed: possible deadlock in tty_buffer_flush
run #7: crashed: possible deadlock in tty_buffer_flush
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
representative crash: possible deadlock in n_tty_flush_buffer, types: [LOCKDEP]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed
testing commit 595523945be0a5a2f12a1c04772383293fbc04a1 gcc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
failed building 595523945be0a5a2f12a1c04772383293fbc04a1: 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 595523945be0a5a2f12a1c04772383293fbc04a1 gcc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 68f6c80da06379fa6be809633b00c0ea50918a57962e80958cb800622bc311fc
run #0: crashed: possible deadlock in n_tty_flush_buffer
run #1: crashed: possible deadlock in n_tty_flush_buffer
run #2: crashed: possible deadlock in tty_buffer_flush
run #3: crashed: possible deadlock in tty_buffer_flush
run #4: crashed: possible deadlock in n_tty_flush_buffer
run #5: crashed: possible deadlock in tty_buffer_flush
run #6: crashed: possible deadlock in tty_buffer_flush
run #7: crashed: possible deadlock in tty_buffer_flush
run #8: crashed: possible deadlock in tty_buffer_flush
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
representative crash: possible deadlock in n_tty_flush_buffer, 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 595523945be0a5a2f12a1c04772383293fbc04a1 gcc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 81aded7adc28e469f2e227664d40de27f4576859c693ddef127e6ec822b7a843
run #0: crashed: possible deadlock in corrupted
run #1: crashed: possible deadlock in n_tty_flush_buffer
run #2: crashed: possible deadlock in n_tty_flush_buffer
run #3: crashed: possible deadlock in n_tty_flush_buffer
run #4: crashed: possible deadlock in n_tty_flush_buffer
run #5: crashed: possible deadlock in tty_buffer_flush
run #6: crashed: possible deadlock in tty_buffer_flush
run #7: crashed: possible deadlock in n_tty_receive_buf_common
run #8: crashed: possible deadlock in tty_buffer_flush
run #9: crashed: possible deadlock in tty_buffer_flush
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
representative crash: possible deadlock in corrupted, types: [LOCKDEP]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed
testing commit 595523945be0a5a2f12a1c04772383293fbc04a1 gcc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: b6d22b5d891298424cb70f38fff4d3414f0ee94f1347b746e61054e0ccbf92a1
all runs: OK
false negative chance: 0.000
minimized to 847 configs; suspects: [6LOWPAN ARCH_ENABLE_MEMORY_HOTREMOVE ASUS_WMI ATM BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CHARGER_BQ24190 CMA COMMON_CLK CONTIG_ALLOC DAX DLM DRM DRM_BRIDGE 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_BACKED_BY_FILE 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 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 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_ZEROPLUS 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 IP_VS IP_VS_DH IRQ_REMAP IRQ_TIME_ACCOUNTING KVM KVM_INTEL LAPB LCD_CLASS_DEVICE LIBNVDIMM MAC802154 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_DLN2 MFD_VIPERBOARD 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 NOP_USB_XCEIV PARPORT PCCARD PCMCIA PHONET RADIO_ADAPTERS RADIO_SI470X RADIO_SI4713 RAS RC_CORE REGULATOR RFKILL SND SOUND SPI SSB STAGING TAP TARGET_CORE TRANSPARENT_HUGEPAGE TUN TYPEC TYPEC_MUX_PI3USB30532 USB_AMD5536UDC USB_ATM 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_NPCM 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 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UVC_COMMON U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VDPA_SIM VDPA_SIM_BLOCK VDPA_SIM_NET 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 VIDEO 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_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_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 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ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_842 ZSWAP_DEFAULT_ON ZSWAP_SHRINKER_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_Z3FOLD_DEPRECATED]
disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed
testing current HEAD 586de92313fcab8ed84ac5f78f4d2aae2db92c59
testing commit 586de92313fcab8ed84ac5f78f4d2aae2db92c59 gcc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 444e9b79bfe2746e14f8cdb6f8970fdfd9673ce2d83efd344c381aa31028cf15
run #0: crashed: possible deadlock in n_tty_flush_buffer
run #1: crashed: possible deadlock in n_tty_flush_buffer
run #2: crashed: possible deadlock in n_tty_flush_buffer
run #3: crashed: possible deadlock in tty_buffer_flush
run #4: OK
run #5: OK
run #6: OK
run #7: crashed: possible deadlock in tty_buffer_flush
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
representative crash: possible deadlock in n_tty_flush_buffer, types: [LOCKDEP]
crash still not fixed/happens on the oldest tested release
reproducer is flaky (0.50 repro chance estimate)
revisions tested: 7, total time: 4h51m42.659444489s (build: 3h17m8.647564068s, test: 1h24m23.591375585s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'i2c-for-6.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
crash: possible deadlock in n_tty_flush_buffer
keytouch 0003:0926:3333.004B: input,hidraw4: USB HID v0.00 Keyboard [HID 0926:3333] on usb-dummy_hcd.3-1/input0
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc7-syzkaller #0 Not tainted
------------------------------------------------------
kworker/0:4/3767 is trying to acquire lock:
ffff8881666462e8 (&tty->termios_rwsem){++++}-{4:4}, at: n_tty_flush_buffer+0x1a/0xa0 drivers/tty/n_tty.c:358
but task is already holding lock:
ffff8881000c88b8 (&buf->lock){+.+.}-{4:4}, at: tty_buffer_flush+0x32/0xf0 drivers/tty/tty_buffer.c:229
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&buf->lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0xc6/0xa90 kernel/locking/mutex.c:730
tty_buffer_flush+0x32/0xf0 drivers/tty/tty_buffer.c:229
tty_ldisc_flush+0x2f/0x60 drivers/tty/tty_ldisc.c:388
__do_SAK+0x2f0/0x330 drivers/tty/tty_io.c:3037
vc_SAK+0x27/0x80 drivers/tty/vt/vt_ioctl.c:993
process_one_work+0x22f/0x6b0 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x1bc/0x350 kernel/workqueue.c:3400
kthread+0xf7/0x200 kernel/kthread.c:464
ret_from_fork+0x2c/0x50 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #2 (console_lock){+.+.}-{0:0}:
console_lock+0x3e/0x80 kernel/printk/printk.c:2833
uart_configure_port drivers/tty/serial/serial_core.c:2599 [inline]
serial_core_add_one_port drivers/tty/serial/serial_core.c:3160 [inline]
serial_core_register_port+0x303/0x8c0 drivers/tty/serial/serial_core.c:3391
serial8250_register_8250_port+0x445/0x6e0 drivers/tty/serial/8250/8250_core.c:822
serial_pnp_probe+0x1e4/0x360 drivers/tty/serial/8250/8250_pnp.c:480
pnp_device_probe+0xac/0x150 drivers/pnp/driver.c:111
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0xbc/0x380 drivers/base/dd.c:658
__driver_probe_device+0x73/0x150 drivers/base/dd.c:800
driver_probe_device+0x1a/0x90 drivers/base/dd.c:830
__driver_attach+0xd1/0x1c0 drivers/base/dd.c:1216
bus_for_each_dev+0x87/0xe0 drivers/base/bus.c:370
bus_add_driver+0x110/0x240 drivers/base/bus.c:678
driver_register+0x54/0x100 drivers/base/driver.c:249
serial8250_init+0x6d/0x110 drivers/tty/serial/8250/8250_platform.c:315
do_one_initcall+0x6f/0x320 init/main.c:1257
do_initcall_level init/main.c:1319 [inline]
do_initcalls init/main.c:1335 [inline]
do_basic_setup init/main.c:1354 [inline]
kernel_init_freeable+0x23e/0x3f0 init/main.c:1568
kernel_init+0x15/0x1b0 init/main.c:1457
ret_from_fork+0x2c/0x50 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #1 (&port->mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0xc6/0xa90 kernel/locking/mutex.c:730
class_mutex_constructor include/linux/mutex.h:201 [inline]
uart_set_termios+0x33/0x170 drivers/tty/serial/serial_core.c:1688
tty_set_termios+0x1a7/0x240 drivers/tty/tty_ioctl.c:345
set_termios+0x221/0x2e0 drivers/tty/tty_ioctl.c:520
tty_mode_ioctl+0x33d/0x6d0 drivers/tty/tty_ioctl.c:807
tty_ioctl+0x2df/0x930 drivers/tty/tty_io.c:2811
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl fs/ioctl.c:892 [inline]
__x64_sys_ioctl+0x8f/0xc0 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x80/0x1b0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&tty->termios_rwsem){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain kernel/locking/lockdep.c:3906 [inline]
__lock_acquire+0x12ca/0x1af0 kernel/locking/lockdep.c:5228
lock_acquire kernel/locking/lockdep.c:5851 [inline]
lock_acquire+0xce/0x2e0 kernel/locking/lockdep.c:5816
down_write+0x29/0xc0 kernel/locking/rwsem.c:1577
n_tty_flush_buffer+0x1a/0xa0 drivers/tty/n_tty.c:358
tty_buffer_flush+0xb0/0xf0 drivers/tty/tty_buffer.c:241
tty_ldisc_flush+0x2f/0x60 drivers/tty/tty_ldisc.c:388
__do_SAK+0x2f0/0x330 drivers/tty/tty_io.c:3037
vc_SAK+0x27/0x80 drivers/tty/vt/vt_ioctl.c:993
process_one_work+0x22f/0x6b0 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x1bc/0x350 kernel/workqueue.c:3400
kthread+0xf7/0x200 kernel/kthread.c:464
ret_from_fork+0x2c/0x50 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
other info that might help us debug this:
Chain exists of:
&tty->termios_rwsem --> console_lock --> &buf->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&buf->lock);
lock(console_lock);
lock(&buf->lock);
lock(&tty->termios_rwsem);
*** DEADLOCK ***
5 locks held by kworker/0:4/3767:
#0: ffff888100072748 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x43e/0x6b0 kernel/workqueue.c:3213
#1: ffffc9000166be40 ((work_completion)(&vc_cons[currcons].SAK_work)){+.+.}-{0:0}, at: process_one_work+0x1ec/0x6b0 kernel/workqueue.c:3214
#2: ffffffff841f6ca0 (console_lock){+.+.}-{0:0}, at: vc_SAK+0xd/0x80 drivers/tty/vt/vt_ioctl.c:983
#3: ffff8881666460a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref drivers/tty/tty_ldisc.c:263 [inline]
#3: ffff8881666460a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_flush+0x17/0x60 drivers/tty/tty_ldisc.c:386
#4: ffff8881000c88b8 (&buf->lock){+.+.}-{4:4}, at: tty_buffer_flush+0x32/0xf0 drivers/tty/tty_buffer.c:229
stack backtrace:
CPU: 0 UID: 0 PID: 3767 Comm: kworker/0:4 Not tainted 6.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events vc_SAK
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x78/0xe0 lib/dump_stack.c:120
print_circular_bug+0x272/0x300 kernel/locking/lockdep.c:2076
check_noncircular+0x11b/0x130 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain kernel/locking/lockdep.c:3906 [inline]
__lock_acquire+0x12ca/0x1af0 kernel/locking/lockdep.c:5228
lock_acquire kernel/locking/lockdep.c:5851 [inline]
lock_acquire+0xce/0x2e0 kernel/locking/lockdep.c:5816
down_write+0x29/0xc0 kernel/locking/rwsem.c:1577
n_tty_flush_buffer+0x1a/0xa0 drivers/tty/n_tty.c:358
tty_buffer_flush+0xb0/0xf0 drivers/tty/tty_buffer.c:241
tty_ldisc_flush+0x2f/0x60 drivers/tty/tty_ldisc.c:388
__do_SAK+0x2f0/0x330 drivers/tty/tty_io.c:3037
vc_SAK+0x27/0x80 drivers/tty/vt/vt_ioctl.c:993
process_one_work+0x22f/0x6b0 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x1bc/0x350 kernel/workqueue.c:3400
kthread+0xf7/0x200 kernel/kthread.c:464
ret_from_fork+0x2c/0x50 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
tty tty1: SAK: killed process 5240 (syz.2.87): by fd#4
tty tty1: SAK: killed process 5241 (syz.2.87): by fd#4
usb 5-1: USB disconnect, device number 16
usb 5-1: new high-speed USB device number 17 using dummy_hcd
usb 5-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 5-1: New USB device found, idVendor=0926, idProduct=3333, bcdDevice= 0.40
usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 5-1: config 0 descriptor??
keytouch 0003:0926:3333.004E: fixing up Keytouch IEC report descriptor
input: HID 0926:3333 as /devices/platform/dummy_hcd.4/usb5/5-1/5-1:0.0/0003:0926:3333.004E/input/input81
keytouch 0003:0926:3333.004E: input,hidraw1: USB HID v0.00 Keyboard [HID 0926:3333] on usb-dummy_hcd.4-1/input0
usb 3-1: USB disconnect, device number 17
usb 3-1: new high-speed USB device number 18 using dummy_hcd
usb 3-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 3-1: New USB device found, idVendor=0926, idProduct=3333, bcdDevice= 0.40
usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 3-1: config 0 descriptor??
keytouch 0003:0926:3333.0054: fixing up Keytouch IEC report descriptor
input: HID 0926:3333 as /devices/platform/dummy_hcd.2/usb3/3-1/3-1:0.0/0003:0926:3333.0054/input/input87
keytouch 0003:0926:3333.0054: input,hidraw2: USB HID v0.00 Keyboard [HID 0926:3333] on usb-dummy_hcd.2-1/input0
usb 1-1: USB disconnect, device number 18
usb 1-1: new high-speed USB device number 19 using dummy_hcd
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 1-1: New USB device found, idVendor=0926, idProduct=3333, bcdDevice= 0.40
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
keytouch 0003:0926:3333.0057: fixing up Keytouch IEC report descriptor
input: HID 0926:3333 as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/0003:0926:3333.0057/input/input90
keytouch 0003:0926:3333.0057: input,hidraw0: USB HID v0.00 Keyboard [HID 0926:3333] on usb-dummy_hcd.0-1/input0
usb 7-1: USB disconnect, device number 22
usb 7-1: new high-speed USB device number 23 using dummy_hcd
usb 7-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 7-1: New USB device found, idVendor=0926, idProduct=3333, bcdDevice= 0.40
usb 7-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 7-1: config 0 descriptor??
keytouch 0003:0926:3333.0069: fixing up Keytouch IEC report descriptor
input: HID 0926:3333 as /devices/platform/dummy_hcd.6/usb7/7-1/7-1:0.0/0003:0926:3333.0069/input/input108
keytouch 0003:0926:3333.0069: input,hidraw3: USB HID v0.00 Keyboard [HID 0926:3333] on usb-dummy_hcd.6-1/input0
usb 3-1: USB disconnect, device number 22