ci starts bisection 2025-07-20 20:50:33.981010177 +0000 UTC m=+140050.080011240 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 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 881a5c1070c86998164643a1ce1af764bb387d82125be6dc7bb5a252b33d77bc 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 [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 1134b29d046ff5bf67f4ad3707ca089334c3b28954eff344bd4e74794f2122a6 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 [locking atomic_sleep memleak ubsan bug_or_warning kasan], they are not needed kconfig minimization: base=4088 full=8256 leaves diff=2144 split chunks (needed=false): <2144> split chunk #0 of len 2144 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 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: b82a12f797e3e82d610b21f65613001dbf0ac36419dbdc019cd6373793a19ede 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 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 failed building ad1b832bf1cf2df9304f8eb72943111625c7e5a7: ld.lld: error: undefined symbol: devm_drm_of_get_bridge testing without sub-chunk 3/5 disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 4c2bfee75486262181c5a98b53ca36f9b0aa8228c18f76f856a2bacf4f9d7357 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 [locking atomic_sleep memleak ubsan bug_or_warning kasan], they are not needed testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 249a1b26c96f6f2916e3bdd330d74015c5a01a3850a022d013e8b89205b908a0 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 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: adc139fbfce47f9066a0b05601e306d4d868002069ed6198be19286c61b48bd2 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 GVE 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 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 [kasan locking atomic_sleep memleak ubsan bug_or_warning], they are not needed testing current HEAD 07fa9cad54609df3eea00cd5b167df6088ce01a6 testing commit 07fa9cad54609df3eea00cd5b167df6088ce01a6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 921521280f725ab5484a622e42c26092a09cfec938cc80f2fc16bb1e23fdbab5 all runs: 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: 3h4m27.814596812s (build: 2h12m20.03691491s, test: 42m41.439371982s) crash still not fixed or there were kernel test errors commit msg: Merge tag 'x86-urgent-2025-07-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip crash: INFO: task hung in anon_pipe_write INFO: task kworker/0:2:1483 blocked for more than 143 seconds. Not tainted 6.16.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack:14128 pid:1483 tgid:1483 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: events p9_write_work Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x75b/0xc20 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xac/0x140 kernel/sched/core.c:6879 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6936 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x46b/0xb00 kernel/locking/mutex.c:747 anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 __kernel_write_iter+0x142/0x250 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:3238 [inline] process_scheduled_works+0x2e7/0x5e0 kernel/workqueue.c:3321 worker_thread+0x20a/0x2f0 kernel/workqueue.c:3402 kthread+0x203/0x230 kernel/kthread.c:464 ret_from_fork+0x9d/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/0:1/11: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc90000063e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90000063e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff88810639ec68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 1 lock held by khungtaskd/31: #0: ffffffff835deb30 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff835deb30 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff835deb30 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6770 3 locks held by kworker/1:1/39: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc9000014fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc9000014fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff8881063ce468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 3 locks held by kworker/1:2/499: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc90001517e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90001517e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff888102712e68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 3 locks held by kworker/0:2/1483: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc90002d6fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90002d6fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff888101288868 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by getty/1638: #0: ffff888101f070a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243 #1: ffffc90002d732f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x1c3/0x6e0 drivers/tty/n_tty.c:2222 2 locks held by syz.3.16/3542: #0: ffff888101288868 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff8881119802e8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff8881119802e8 (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: ffff8881063ce468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff8881705282e8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff8881705282e8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 2 locks held by syz.5.18/4380: #0: ffff88810639ec68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff8881119808d0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff8881119808d0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/0:3/4382: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc90002af7e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90002af7e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff8881063cc468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.6.19/4801: #0: ffff888102712e68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff8881705288d0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff8881705288d0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/1:3/4802: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc90003223e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90003223e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff88810e3e0e68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 3 locks held by kworker/0:4/4803: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc900032dbe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc900032dbe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff88810cfd3c68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.7.20/5222: #0: ffff8881063cc468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff888111980eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff888111980eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 2 locks held by syz.8.21/5641: #0: ffff88810cfd3c68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff8881119814a0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff8881119814a0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/0:5/5643: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc900041cbe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc900041cbe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff88810efffa68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.9.22/6062: #0: ffff88810e3e0e68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff888111981a88 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff888111981a88 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 3 locks held by kworker/0:6/6310: #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x27f/0x5e0 kernel/workqueue.c:3321 #1: ffffc90004d4be48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90004d4be48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x29f/0x5e0 kernel/workqueue.c:3321 #2: ffff88810e3f7868 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 2 locks held by syz.0.23/6483: #0: ffff88810efffa68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff888111982070 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff888111982070 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 2 locks held by syz.1.24/6903: #0: ffff88810e3f7868 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4a/0x5b0 fs/pipe.c:458 #1: ffff888111982658 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff888111982658 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x70/0x270 mm/readahead.c:228 5 locks held by modprobe/6961: #0: ffff888237d2b518 (&rq->__lock){....}-{2:2}, at: raw_spin_rq_lock_nested+0x20/0x70 kernel/sched/core.c:606 #1: ffff888100ace058 (&sighand->siglock){....}-{2:2}, at: do_notify_parent+0x241/0x2e0 kernel/signal.c:2231 #2: ffff8881012944f8 (&sig->wait_chldexit){....}-{2:2}, at: __wake_up_common_lock kernel/sched/wait.c:105 [inline] #2: ffff8881012944f8 (&sig->wait_chldexit){....}-{2:2}, at: __wake_up_sync_key+0x25/0xa0 kernel/sched/wait.c:173 #3: ffff8881012a5c60 (&p->pi_lock){....}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline] #3: ffff8881012a5c60 (&p->pi_lock){....}-{2:2}, at: try_to_wake_up+0x59/0x670 kernel/sched/core.c:4227 #4: ffff888237d2b518 (&rq->__lock){....}-{2:2}, at: raw_spin_rq_lock_nested+0x20/0x70 kernel/sched/core.c:606 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc6-syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0x604/0x630 kernel/hung_task.c:470 kthread+0x203/0x230 kernel/kthread.c:464 ret_from_fork+0x9d/0x170 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted 6.16.0-rc6-syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__rb_insert lib/rbtree.c:117 [inline] RIP: 0010:__rb_insert_augmented+0x5a/0x180 lib/rbtree.c:459 Code: 48 83 c9 01 48 89 08 48 89 0e 48 8b 33 48 89 df 48 83 e6 fc 48 89 33 74 d0 48 8b 1e f6 c3 01 75 cf 48 8b 43 08 48 39 f0 74 13 <48> 85 c0 0f 84 91 00 00 00 f6 00 01 74 c5 e9 87 00 00 00 48 8b 43 RSP: 0018:ffffc90000137cc8 EFLAGS: 00000007 RAX: 0000000000000000 RBX: ffff88810cfed310 RCX: 0000000000155cc0 RDX: ffffffff81311c60 RSI: ffff888109af1c10 RDI: ffff8881026d9c10 RBP: ffff888237d2b5c0 R08: ffff888109af1c10 R09: 000000044896f0b3 R10: 000000044896f0b3 R11: 0000000000155cc0 R12: ffff888109af1c00 R13: ffff888237d2b5c0 R14: ffff888237d2b5f8 R15: ffffc90000137d58 FS: 0000000000000000(0000) GS:ffff8882b39f1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f867feb4a90 CR3: 00000000034aa000 CR4: 00000000003506f0 Call Trace: put_prev_entity kernel/sched/fair.c:5630 [inline] pick_next_task_fair+0x25c/0x390 kernel/sched/fair.c:8933 __pick_next_task kernel/sched/core.c:6047 [inline] pick_next_task kernel/sched/core.c:6566 [inline] __schedule+0x300/0xc20 kernel/sched/core.c:6739 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xac/0x140 kernel/sched/core.c:6879 toggle_allocation_gate+0xa8/0x120 mm/kfence/core.c:852 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x2e7/0x5e0 kernel/workqueue.c:3321 worker_thread+0x20a/0x2f0 kernel/workqueue.c:3402 kthread+0x203/0x230 kernel/kthread.c:464 ret_from_fork+0x9d/0x170 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245