ci starts bisection 2025-04-11 11:30:50.009552724 +0000 UTC m=+104.786410990
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 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: d495c88e6197132ca36679e03087674953f770c8f457a769fa5e97dd36d1e368
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 [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: c197215fbeca234ba2621e7acb070a9452d6b4261a6b04d141efc2c3fe17ef1e
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 KASAN LOCKDEP ATOMIC_SLEEP LEAK UBSAN], they are not needed
kconfig minimization: base=4071 full=8256 leaves diff=2128
split chunks (needed=false): <2128>
split chunk #0 of len 2128 into 5 parts
testing without sub-chunk 1/5
disabling configs for [ATOMIC_SLEEP LEAK UBSAN BUG KASAN LOCKDEP], they are not needed
testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: c34ea6cedeb8b28611b41103792cc0ee577a93afbd5876038175285787f899b1
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 [LOCKDEP ATOMIC_SLEEP LEAK UBSAN BUG KASAN], they are not needed
testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
failed building ad1b832bf1cf2df9304f8eb72943111625c7e5a7: 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 [ATOMIC_SLEEP LEAK UBSAN BUG KASAN LOCKDEP], they are not needed
testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: e20de9ee907baba068c00dee2faedeae41dd363fe396299c0ba761b5e3fa2bb8
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 KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed
testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 2439d6b782b0112edcb03d116b3d6b2326631891bddd369e90181e04736cac38
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 [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed
testing commit ad1b832bf1cf2df9304f8eb72943111625c7e5a7 gcc
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: f2f74050270c6a8f561e4a4e8c0ce61faa45ac7fb7896542b9580855f9c22cf8
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 426 configs; suspects: [6LOWPAN ARCH_ENABLE_MEMORY_HOTREMOVE ASUS_WMI CHARGER_BQ24190 CMA COMMON_CLK DAX DLM DRM DRM_BRIDGE DRM_I915 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 IP_SET_HASH_NETPORTNET IP_SET_LIST_SET IP_VS IP_VS_DH IP_VS_FO IP_VS_FTP IP_VS_IPV6 IP_VS_PROTO_TCP 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 [BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK UBSAN], they are not needed
testing current HEAD 900241a5cc15e6e0709a012051cc72d224cd6a6e
testing commit 900241a5cc15e6e0709a012051cc72d224cd6a6e gcc
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 2b438e2130fcdd9b86819a202ff1899658b673b9b3b87d538765688922bb8ef6
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: 2h20m21.345067743s (build: 1h26m14.229906238s, test: 43m50.620827616s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'drm-fixes-2025-04-11-1' of https://gitlab.freedesktop.org/drm/kernel
crash: INFO: task hung in anon_pipe_write
INFO: task kworker/1:1:38 blocked for more than 143 seconds.
Not tainted 6.15.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1 state:D stack:12528 pid:38 tgid:38 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x78f/0xca0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xac/0x140 kernel/sched/core.c:6860
schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x467/0xa90 kernel/locking/mutex.c:746
anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
__kernel_write_iter+0x13a/0x230 fs/read_write.c:617
__kernel_write fs/read_write.c:637 [inline]
kernel_write+0x13c/0x210 fs/read_write.c:658
p9_fd_write net/9p/trans_fd.c:434 [inline]
p9_write_work+0x15e/0x310 net/9p/trans_fd.c:485
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0x2db/0x620 kernel/workqueue.c:3319
worker_thread+0x206/0x2f0 kernel/workqueue.c:3400
kthread+0x1fb/0x230 kernel/kthread.c:464
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153
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:3213 [inline]
#0: ffff888100078748 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc90000053e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90000053e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff88810dbe8668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
1 lock held by khungtaskd/31:
#0: ffffffff835dee28 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff835dee28 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff835dee28 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x30/0x100 kernel/locking/lockdep.c:6764
3 locks held by kworker/1:1/38:
#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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc90000147e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90000147e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff88810e709668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
3 locks held by kworker/1:2/468:
#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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc900015e7e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900015e7e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff8881067e2a68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc900030bfe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900030bfe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff88810fb66a68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
2 locks held by getty/1634:
#0: ffff88810c69f0a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243
#1: ffffc900001fb2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x1d3/0x710 drivers/tty/n_tty.c:2222
2 locks held by syz.3.16/3530:
#0: ffff88810e709668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b6882e8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b6882e8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
2 locks held by syz.4.17/3949:
#0: ffff8881067e2a68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b6888d0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b6888d0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
3 locks held by kworker/1:3/3950:
#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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc900033efe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900033efe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff88810fb5c268 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
2 locks held by syz.5.18/4369:
#0: ffff88810dbe8668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b4902e8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b4902e8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
2 locks held by syz.6.19/4789:
#0: ffff88810fb66a68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b688eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b688eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
3 locks held by kworker/0:3/4790:
#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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc90004827e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90004827e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff88810f7a1668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
3 locks held by kworker/0:4/4791:
#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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc900047f7e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900047f7e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff888105fd3e68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
2 locks held by syz.7.20/5210:
#0: ffff88810f7a1668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b6894a0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b6894a0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
2 locks held by syz.8.21/5629:
#0: ffff888105fd3e68 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b4908d0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b4908d0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
3 locks held by kworker/0:5/5630:
#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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc90005b3fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90005b3fe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff888168e1c268 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
2 locks held by syz.9.22/6049:
#0: ffff88810fb5c268 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b689a88 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b689a88 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
3 locks held by kworker/1:4/6050:
#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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc900063ffe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900063ffe48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff888168d6a468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
2 locks held by syz.0.23/6469:
#0: ffff888168d6a468 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b68a070 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b68a070 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
3 locks held by kworker/0:6/6471:
#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+0x276/0x620 kernel/workqueue.c:3319
#1: ffffc90006d37e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90006d37e48 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x296/0x620 kernel/workqueue.c:3319
#2: ffff888168d7f668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
2 locks held by syz.1.24/6890:
#0: ffff888168e1c268 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b490eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b490eb8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
2 locks held by syz.2.25/7309:
#0: ffff888168d7f668 (&pipe->mutex){....}-{3:3}, at: anon_pipe_write+0x4d/0x5a0 fs/pipe.c:459
#1: ffff88816b4914a0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
#1: ffff88816b4914a0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x74/0x270 mm/readahead.c:228
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x42/0xe0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x147/0x160 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:274 [inline]
watchdog+0x602/0x630 kernel/hung_task.c:437
kthread+0x1fb/0x230 kernel/kthread.c:464
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153
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 6.15.0-rc1-syzkaller #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:81
Code: cc cc cc cc 0f 1f 00 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 51 ca 0b 00 f3 0f 1e fa fb f4 cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff83403e90 EFLAGS: 000002c2
RAX: 1b07ece9cc2f4b00 RBX: 0000000000000000 RCX: 7fffffffffffffff
RDX: ffffffff83403e67 RSI: ffffffff83152d7f RDI: ffffffff8316e298
RBP: ffffffff83489740 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8434d020
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8882b38c7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556cceb4a8 CR3: 00000000034ac000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:748
default_idle_call+0x3d/0x60 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0xd8/0x240 kernel/sched/idle.c:325
cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:423
rest_init+0x10c/0x110 init/main.c:743
start_kernel+0x2e9/0x300 init/main.c:1099
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513
x86_64_start_kernel+0x61/0x70 arch/x86/kernel/head64.c:494
common_startup_64+0x13e/0x147