ci starts bisection 2025-08-29 04:21:07.991133165 +0000 UTC m=+16344.475425175 bisecting fixing commit since ad1b832bf1cf2df9304f8eb72943111625c7e5a7 building syzkaller on 40a34ec944732a2502ee67d92cc8c023355dfad4 ensuring issue is reproducible on original commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 91a327077ecb4df5996fde58857055d762d5d990a919d82269f7fd5c848491f6 all runs: crashed: INFO: task hung in pipe_write representative crash: INFO: task hung in pipe_write, types: [HANG] check whether we can drop unnecessary instrumentation disabling configs for [bug_or_warning kasan locking atomic_sleep memleak ubsan], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 918b583260042b1e09f52b08f175f83c9d2a5de3dda539611c7b9618964efc28 all runs: crashed: INFO: task hung in pipe_write representative crash: INFO: task hung in pipe_write, types: [HANG] the bug reproduces without the instrumentation disabling configs for [bug_or_warning kasan locking atomic_sleep memleak ubsan], they are not needed kconfig minimization: base=4092 full=8256 leaves diff=2142 split chunks (needed=false): <2142> split chunk #0 of len 2142 into 5 parts testing without sub-chunk 1/5 disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: c65d8afa10b5fbd500dde84e46e50393ad920644b86afc24e9e1ae4364f5cea1 all runs: crashed: INFO: task hung in pipe_write representative crash: INFO: task hung in pipe_write, types: [HANG] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 failed building ad1b832bf1cf2df9304f8eb72943111625c7e5a7: ld.lld: error: undefined symbol: devm_drm_of_get_bridge testing without sub-chunk 3/5 disabling configs for [locking atomic_sleep memleak ubsan bug_or_warning kasan], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 172e0e34bc3547f8ff1ec115bb054df6eb16d02a74e284b13e67b67b21b84f97 all runs: crashed: INFO: task hung in pipe_write representative crash: INFO: task hung in pipe_write, types: [HANG] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep memleak], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 55f922dfca6fde939db6e9baff5c2b6b891260ed4ed0d18ddc701badffee4277 all runs: crashed: INFO: task hung in pipe_write representative crash: INFO: task hung in pipe_write, types: [HANG] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 04ed095ce19996dec2954d64fc9cbefd44f098bfc137153924b00100614a419c all runs: crashed: INFO: task hung in pipe_write representative crash: INFO: task hung in pipe_write, types: [HANG] the chunk can be dropped minimized to 429 configs; suspects: [6LOWPAN ARCH_ENABLE_MEMORY_HOTREMOVE ASUS_WMI CHARGER_BQ24190 CMA COMMON_CLK DAX DLM DRM DRM_BRIDGE 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 GENERIC_PTDUMP 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 HAVE_ARCH_NODE_DEV_GROUP HAVE_ARCH_USERFAULTFD_MINOR HAVE_ARCH_USERFAULTFD_WP HAVE_BOOTMEM_INFO_NODE HAVE_CLK_PREPARE HAVE_EISA 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_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 IRQ_TIME_ACCOUNTING LAPB LCD_CLASS_DEVICE MAC802154 MCORE2 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 [atomic_sleep memleak ubsan bug_or_warning kasan locking], they are not needed testing current HEAD 07d9df80082b8d1f37e05658371b087cb6738770 testing commit 07d9df80082b8d1f37e05658371b087cb6738770 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 6710082fd20207863a0f190bf9b016a2e5ce680509a909d3b15ee961fec2f5d8 run #0: crashed: INFO: task hung in anon_pipe_write run #1: crashed: INFO: task hung in anon_pipe_write run #2: crashed: INFO: task hung in anon_pipe_write run #3: crashed: INFO: task hung in anon_pipe_write run #4: crashed: INFO: task hung in anon_pipe_write run #5: crashed: INFO: task hung in anon_pipe_write run #6: crashed: INFO: task hung in anon_pipe_write run #7: crashed: INFO: task hung in corrupted run #8: crashed: INFO: task hung in anon_pipe_write run #9: crashed: INFO: task hung in anon_pipe_write representative crash: INFO: task hung in anon_pipe_write, types: [HANG] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 5h24m22.972185527s (build: 4h34m49.024239688s, test: 41m3.526231534s) crash still not fixed or there were kernel test errors commit msg: Merge tag 'perf-tools-fixes-for-v6.17-2025-08-27' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools crash: INFO: task hung in anon_pipe_write INFO: task kworker/1:2:1751 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:2 state:D stack:14000 pid:1751 tgid:1751 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: events p9_write_work Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x738/0xc00 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xac/0x140 kernel/sched/core.c:7058 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x4b5/0xcc0 kernel/locking/mutex.c:760 anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 __kernel_write_iter+0x13d/0x250 fs/read_write.c:619 __kernel_write fs/read_write.c:639 [inline] kernel_write+0x12c/0x200 fs/read_write.c:660 p9_fd_write net/9p/trans_fd.c:434 [inline] p9_write_work+0x160/0x310 net/9p/trans_fd.c:485 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0x2e4/0x5e0 kernel/workqueue.c:3319 worker_thread+0x20a/0x2f0 kernel/workqueue.c:3400 kthread+0x200/0x230 kernel/kthread.c:463 ret_from_fork+0x9a/0x170 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Showing all locks held in the system: 3 locks held by kworker/0:0/9: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc90000053e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90000053e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff888107f1be68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 1 lock held by khungtaskd/31: #0: ffffffff835e0170 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff835e0170 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff835e0170 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6775 3 locks held by kworker/1:1/38: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc90000147e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90000147e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff8881056adc68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 3 locks held by kworker/0:2/502: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc9000154fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000154fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff88810cbcc068 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by getty/1637: #0: ffff888102fc78a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f132f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x1c3/0x6e0 drivers/tty/n_tty.c:2222 3 locks held by kworker/1:2/1751: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc90000f2fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90000f2fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff888103b66468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.3.16/3542: #0: ffff888103b66468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dc502e8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dc502e8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 2 locks held by syz.4.17/3961: #0: ffff8881056adc68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dd702e8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dd702e8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/1:3/3962: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc900025a7e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc900025a7e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff888102778068 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.5.18/4381: #0: ffff888102778068 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dd708d0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dd708d0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/1:4/4382: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc90002d9fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90002d9fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff88810571a468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.6.19/4801: #0: ffff888107f1be68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dc508d0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dc508d0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/0:3/4802: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc90002ddfe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90002ddfe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff888110809a68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.7.20/5221: #0: ffff88810cbcc068 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dc50eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dc50eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 2 locks held by syz.8.21/5640: #0: ffff888110809a68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dc514a0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dc514a0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/0:4/5642: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc90004683e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90004683e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff888103774468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.9.22/6061: #0: ffff888103774468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dc51a88 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dc51a88 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/0:5/6062: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc90004f13e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90004f13e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff888103775468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.0.23/6481: #0: ffff888103775468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dc52070 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dc52070 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 2 locks held by syz.1.24/6902: #0: ffff88810571a468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dd70eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dd70eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/1:5/6903: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3319 #1: ffffc90006033e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90006033e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3319 #2: ffff88810571b668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.2.25/7322: #0: ffff88810571b668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff88816dd714a0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff88816dd714a0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0xa2/0xf0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x109/0x170 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x8e/0x140 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline] watchdog+0x581/0x5b0 kernel/hung_task.c:491 kthread+0x200/0x230 kernel/kthread.c:463 ret_from_fork+0x9a/0x170 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82 Code: 13 20 01 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 29 cc 0a 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffffff83403e90 EFLAGS: 000002c6 RAX: bdba804e1317c500 RBX: 0000000000000000 RCX: bdba804e1317c500 RDX: ffffffff83403e67 RSI: ffffffff8316195a RDI: ffffffff832b7d42 RBP: ffffffff83403ea8 R08: 0000000000080000 R09: 0000000000000054 R10: 0000000000000000 R11: ffffffff8128e030 R12: 0000000000000000 R13: ffffffff83488880 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8882b38e6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557c8cc6a9d8 CR3: 00000000034ac000 CR4: 00000000003506f0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:757 default_idle_call+0x3d/0x70 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0xd7/0x240 kernel/sched/idle.c:330 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:428 rest_init+0xca/0xd0 init/main.c:744 start_kernel+0x2f5/0x310 init/main.c:1097 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0xfc/0x100 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x147