ci2 starts bisection 2025-11-23 14:33:26.464786554 +0000 UTC m=+157154.331505938
bisecting fixing commit since 882efbdd9d34ebaf03da2dd0246f07f251b0aed2
building syzkaller on 7e2882b32698b70f3149aee00c41e3d2d941dca3
ensuring issue is reproducible on original commit 882efbdd9d34ebaf03da2dd0246f07f251b0aed2
testing commit 882efbdd9d34ebaf03da2dd0246f07f251b0aed2 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 6d86fa444a7441eec54ad7044156f1bdecae6e22371437b3ed07ba501cd6cc09
run #0: crashed: INFO: task hung in exit_signals
run #1: crashed: INFO: task hung in exit_signals
run #2: crashed: INFO: task hung in exit_signals
run #3: crashed: INFO: task hung in exit_signals
run #4: crashed: INFO: task hung in exit_mmap
run #5: crashed: INFO: task hung in exit_mmap
run #6: crashed: INFO: task hung in exit_mmap
run #7: crashed: INFO: task hung in mpol_rebind_mm
run #8: crashed: INFO: task hung in exit_signals
run #9: crashed: INFO: task hung in exit_signals
run #10: crashed: INFO: task hung in exit_mmap
run #11: crashed: INFO: task hung in exit_signals
run #12: crashed: INFO: task hung in exit_signals
run #13: crashed: INFO: task hung in exit_mmap
run #14: crashed: INFO: task hung in exit_mmap
run #15: crashed: INFO: task hung in exit_signals
run #16: crashed: INFO: task hung in exit_mmap
run #17: crashed: INFO: task hung in exit_signals
run #18: crashed: INFO: task hung in exit_mmap
run #19: crashed: INFO: task hung in exit_signals
representative crash: INFO: task hung in exit_signals, 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 882efbdd9d34ebaf03da2dd0246f07f251b0aed2 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 1d0a19acb4203ede65d60295c5121ff2d5077e9090308404aace04179f041f4a
run #0: crashed: INFO: task hung in exit_mmap
run #1: crashed: INFO: task hung in exit_mmap
run #2: crashed: INFO: task hung in exit_mmap
run #3: crashed: INFO: task hung in crda_timeout_work
run #4: crashed: INFO: task hung in __cgroup_procs_write
run #5: crashed: INFO: task hung in __netif_napi_del
run #6: crashed: INFO: task hung in exit_mmap
run #7: crashed: INFO: task hung in exit_mmap
run #8: crashed: INFO: task hung in exit_mmap
run #9: crashed: INFO: task hung in cgroup_can_fork
representative crash: INFO: task hung in exit_mmap, types: [HANG]
the bug reproduces without the instrumentation
disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep memleak], they are not needed
kconfig minimization: base=3829 full=7619 leaves diff=2129
split chunks (needed=false): <2129>
split chunk #0 of len 2129 into 5 parts
testing without sub-chunk 1/5
disabling configs for [bug_or_warning kasan locking atomic_sleep memleak ubsan], they are not needed
testing commit 882efbdd9d34ebaf03da2dd0246f07f251b0aed2 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: e61b7ed8ec33eec3d61144e4d753b51423caeab2ea50817d7d56f0757c4d2c38
run #0: crashed: INFO: task hung in exit_mmap
run #1: crashed: INFO: task hung in exit_mmap
run #2: crashed: INFO: task hung in exit_mmap
run #3: crashed: INFO: task hung in exit_mmap
run #4: crashed: INFO: task hung in mpol_rebind_mm
run #5: crashed: INFO: task hung in mpol_rebind_mm
run #6: crashed: INFO: task hung in exit_signals
run #7: crashed: INFO: task hung in cgroup_can_fork
run #8: crashed: INFO: task hung in exit_mmap
run #9: crashed: INFO: task hung in exit_mmap
representative crash: INFO: task hung in exit_mmap, types: [HANG]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [locking atomic_sleep memleak ubsan bug_or_warning kasan], they are not needed
testing commit 882efbdd9d34ebaf03da2dd0246f07f251b0aed2 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 147d823fc100dd4ee7067f36f350912d72468c58ca0ad45dd0c7d9c95b615ee3
run #0: crashed: INFO: task hung in exit_mmap
run #1: crashed: INFO: task hung in exit_mmap
run #2: crashed: INFO: task hung in exit_mmap
run #3: crashed: INFO: task hung in exit_mmap
run #4: crashed: INFO: task hung in exit_mmap
run #5: crashed: INFO: task hung in exit_mmap
run #6: crashed: INFO: task hung in exit_signals
run #7: crashed: INFO: task hung in exit_signals
run #8: crashed: INFO: task hung in exit_mmap
run #9: crashed: INFO: task hung in exit_mmap
representative crash: INFO: task hung in exit_mmap, types: [HANG]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep memleak], they are not needed
testing commit 882efbdd9d34ebaf03da2dd0246f07f251b0aed2 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: ce6455c18973c7e16d5a3a3166d551d9d41435a84f6573ed9415e7ffd3501db9
all runs: crashed: INFO: task hung in exit_mmap
representative crash: INFO: task hung in exit_mmap, types: [HANG]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [atomic_sleep memleak ubsan bug_or_warning kasan locking], they are not needed
testing commit 882efbdd9d34ebaf03da2dd0246f07f251b0aed2 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: a6158ca79f130cd0eacb6ea234976dffa8f51cd7a7e87bc39cc134d9f75453ee
all runs: crashed: INFO: task hung in exit_mmap
representative crash: INFO: task hung in exit_mmap, 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 882efbdd9d34ebaf03da2dd0246f07f251b0aed2 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: ef106efe95cca041eed2c71b928c63d87be369626de5d16abce58c4e5bcc750a
all runs: OK
false negative chance: 0.000
minimized to 425 configs; suspects: [ARCH_ENABLE_MEMORY_HOTREMOVE ATM BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA COMMON_CLK CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DVB_CORE EXTCON FB GPIOLIB HID_ZEROPLUS I2C_MUX IIO IRQ_REMAP KVM KVM_INTEL LIBNVDIMM 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_VIPERBOARD NOP_USB_XCEIV PARPORT PCCARD PCMCIA PHONET RADIO_ADAPTERS RADIO_SI470X RADIO_SI4713 RC_CORE RFKILL SND SOUND SPI SSB TAP TARGET_CORE TUN USB_AMD5536UDC USB_ATM USB_CDC_PHONET USB_CDNS3 USB_CDNS3_GADGET USB_CDNS3_HOST USB_CDNS3_PCI_WRAP 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_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_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_FOTG210_HCD USB_FOTG210_UDC USB_FTDI_ELAN USB_F_ACM USB_F_ECM USB_F_EEM USB_F_FS USB_F_HID USB_F_MASS_STORAGE USB_F_MIDI 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 USB_GADGETFS USB_GADGET_DEBUG_FILES USB_GADGET_DEBUG_FS USB_GL860 USB_GOKU USB_GPIO_VBUS USB_GR_UDC USB_GSPCA USB_GSPCA_BENQ USB_GSPCA_CONEX USB_GSPCA_CPIA1 USB_GSPCA_DTCS033 USB_GSPCA_ETOMS USB_GSPCA_FINEPIX USB_GSPCA_JEILINJ USB_GSPCA_JL2005BCD USB_GSPCA_KINECT USB_GSPCA_KONICA USB_GSPCA_MARS USB_GSPCA_MR97310A USB_GSPCA_NW80X USB_GSPCA_OV519 USB_GSPCA_OV534 USB_GSPCA_OV534_9 USB_GSPCA_PAC207 USB_GSPCA_PAC7302 USB_GSPCA_PAC7311 USB_GSPCA_SE401 USB_GSPCA_SN9C2028 USB_GSPCA_SN9C20X USB_GSPCA_SONIXB USB_GSPCA_SONIXJ USB_GSPCA_SPCA1528 USB_GSPCA_SPCA500 USB_GSPCA_SPCA501 USB_GSPCA_SPCA505 USB_GSPCA_SPCA506 USB_GSPCA_SPCA508 USB_GSPCA_SPCA561 USB_GSPCA_SQ905 USB_GSPCA_SQ905C USB_GSPCA_SQ930X USB_GSPCA_STK014 USB_GSPCA_STK1135 USB_GSPCA_STV0680 USB_GSPCA_SUNPLUS USB_GSPCA_T613 USB_GSPCA_TOPRO USB_GSPCA_TOUPTEK USB_GSPCA_TV8532 USB_GSPCA_VC032X USB_GSPCA_VICAM USB_GSPCA_XIRLINK_CIT USB_GSPCA_ZC3XX USB_HACKRF USB_HCD_BCMA USB_HCD_SSB USB_HSIC_USB3503 USB_HSIC_USB4604 USB_HSO USB_HUB_USB251XB USB_IDMOUSE USB_IOWARRIOR USB_IPHETH USB_ISIGHTFW USB_ISP116X_HCD USB_ISP1301 USB_ISP1760 USB_ISP1760_DUAL_ROLE USB_ISP1760_HCD USB_ISP1761_UDC USB_KAWETH USB_KC2190 USB_KEENE USB_LAN78XX USB_LCD USB_LD USB_LEDS_TRIGGER_USBPORT USB_LED_TRIG USB_LEGOTOWER USB_LGM_PHY USB_LIBCOMPOSITE USB_LINK_LAYER_TEST USB_M5602 USB_MA901 USB_MAX3420_UDC USB_MAX3421_HCD USB_MDC800 USB_MICROTEK USB_MR800 USB_MSI2500 USB_MUSB_DUAL_ROLE USB_MUSB_HDRC USB_MV_U3D USB_MV_UDC USB_NET2272 USB_NET2272_DMA USB_NET2280 USB_NET_AQC111 USB_NET_AX88179_178A USB_NET_AX8817X USB_NET_CDCETHER USB_NET_CDC_EEM USB_NET_CDC_MBIM USB_NET_CDC_NCM USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_CH9200 USB_NET_CX82310_ETH USB_NET_DM9601 USB_NET_GL620A USB_NET_HUAWEI_CDC_NCM USB_NET_INT51X1 USB_NET_KALMIA USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_QMI_WWAN USB_NET_RNDIS_HOST USB_NET_RNDIS_WLAN USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_OXU210HP_HCD USB_PEGASUS USB_PULSE8_CEC USB_PWC USB_PWC_INPUT_EVDEV USB_PXA27X USB_R8A66597 USB_R8A66597_HCD USB_RAINSHADOW_CEC USB_RAREMONO USB_RAW_GADGET USB_RTL8150 USB_RTL8152 USB_RTL8153_ECM USB_S2255 USB_SERIAL USB_SERIAL_AIRCABLE USB_SERIAL_ARK3116 USB_SERIAL_BELKIN USB_SERIAL_CH341 USB_SERIAL_CONSOLE USB_SERIAL_CP210X USB_SERIAL_CYBERJACK USB_SERIAL_CYPRESS_M8 USB_SERIAL_DEBUG USB_SERIAL_DIGI_ACCELEPORT USB_SERIAL_EDGEPORT USB_SERIAL_EDGEPORT_TI USB_SERIAL_EMPEG USB_SERIAL_F81232 USB_SERIAL_F8153X USB_SERIAL_FTDI_SIO USB_SERIAL_GARMIN USB_SERIAL_GENERIC USB_SERIAL_IPAQ USB_SERIAL_IPW USB_SERIAL_IR USB_SERIAL_IUU USB_SERIAL_KEYSPAN USB_SERIAL_KEYSPAN_PDA USB_SERIAL_KLSI USB_SERIAL_KOBIL_SCT USB_SERIAL_MCT_U232 USB_SERIAL_METRO USB_SERIAL_MOS7715_PARPORT USB_SERIAL_MOS7720 USB_SERIAL_MOS7840 USB_SERIAL_MXUPORT USB_SERIAL_NAVMAN USB_SERIAL_OMNINET USB_SERIAL_OPTICON USB_SERIAL_OPTION USB_SERIAL_OTI6858 USB_SERIAL_PL2303 USB_SERIAL_QCAUX USB_SERIAL_QT2 USB_SERIAL_QUALCOMM USB_SERIAL_SAFE USB_SERIAL_SIERRAWIRELESS USB_SERIAL_SIMPLE USB_SERIAL_SPCP8X5 USB_SERIAL_SSU100 USB_SERIAL_SYMBOL USB_SERIAL_TI USB_SERIAL_UPD78F0730 USB_SERIAL_VISOR USB_SERIAL_WHITEHEAT USB_SERIAL_WISHBONE USB_SERIAL_WWAN USB_SERIAL_XR USB_SERIAL_XSENS_MT USB_SEVSEG USB_SI470X USB_SI4713 USB_SIERRA_NET USB_SISUSBVGA USB_SL811_CS USB_SL811_HCD USB_SL811_HCD_ISO USB_SNP_CORE USB_SPEEDTOUCH USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_ENE_UB6250 USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_STV06XX USB_TEST USB_TMC USB_TRANCEVIBRATOR USB_U132_HCD USB_UAS USB_UEAGLEATM USB_ULPI_BUS USB_USBNET USB_USS720 USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_VIDEO_CLASS USB_VIDEO_CLASS_INPUT_EVDEV USB_VL600 USB_WDM USB_XHCI_DBGCAP USB_XHCI_PCI_RENESAS USB_XHCI_PLATFORM USB_XUSBATM USB_YUREX USERFAULTFD USERIO USER_RETURN_NOTIFIER U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VDPA_SIM VDPA_SIM_BLOCK VDPA_SIM_NET VDPA_USER VETH VFIO VFIO_IOMMU_TYPE1 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_VDPA VHOST_VSOCK 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_STK1160_COMMON VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK WLAN_VENDOR_SILABS X86_SGX X86_SGX_KVM X86_X2APIC XARRAY_MULTI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XILLYBUS_CLASS XILLYUSB XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZBUD ZEROPLUS_FF ZLIB_DEFLATE ZONEFS_FS ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZBUD]
disabling configs for [atomic_sleep memleak ubsan bug_or_warning kasan locking], they are not needed
testing current HEAD f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe
testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 60d241590b2bc98e9b85b43f0d6454e623d1e6b799515a581f960d04e2f881c3
all runs: crashed: INFO: task hung in exit_mmap
representative crash: INFO: task hung in exit_mmap, types: [HANG]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 1h58m12.468281578s (build: 48m1.322701742s, test: 1h0m46.344397624s)
crash still not fixed or there were kernel test errors
commit msg: Linux 6.1.158
crash: INFO: task hung in exit_mmap
INFO: task syz.6.25:4068 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.25 state:D stack:13080 pid:4068 ppid:2929 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x56d/0x870 kernel/sched/core.c:6561
schedule+0x50/0xb0 kernel/sched/core.c:6637
rwsem_down_write_slowpath+0x32e/0x750 kernel/locking/rwsem.c:1189
mmap_write_lock include/linux/mmap_lock.h:71 [inline]
exit_mmap+0x1c3/0x410 mm/mmap.c:3258
__mmput+0x28/0xf0 kernel/fork.c:1200
exit_mm+0xb3/0x110 kernel/exit.c:565
do_exit+0x23a/0x9f0 kernel/exit.c:867
do_group_exit+0x83/0xa0 kernel/exit.c:1022
get_signal+0x6b3/0x750 kernel/signal.c:2871
arch_do_signal_or_restart+0x92/0x630 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6b/0xd0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xa8/0x100 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8d2ea5eec9
RSP: 002b:00007f8d2e8cf0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f8d2ecb5fa8 RCX: 00007f8d2ea5eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8d2ecb5fa8
RBP: 00007f8d2ecb5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8d2ecb6038 R14: 00007ffc18334060 R15: 00007ffc18334148
INFO: task syz.5.32:4110 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.32 state:D stack:13360 pid:4110 ppid:2937 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x56d/0x870 kernel/sched/core.c:6561
schedule+0x50/0xb0 kernel/sched/core.c:6637
rwsem_down_write_slowpath+0x32e/0x750 kernel/locking/rwsem.c:1189
mmap_write_lock include/linux/mmap_lock.h:71 [inline]
exit_mmap+0x1c3/0x410 mm/mmap.c:3258
__mmput+0x28/0xf0 kernel/fork.c:1200
exit_mm+0xb3/0x110 kernel/exit.c:565
do_exit+0x23a/0x9f0 kernel/exit.c:867
do_group_exit+0x83/0xa0 kernel/exit.c:1022
get_signal+0x6b3/0x750 kernel/signal.c:2871
arch_do_signal_or_restart+0x92/0x630 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6b/0xd0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xa8/0x100 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f186462eec9
RSP: 002b:00007f186449f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1864885fa8 RCX: 00007f186462eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1864885fa8
RBP: 00007f1864885fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1864886038 R14: 00007ffced0a0830 R15: 00007ffced0a0918
INFO: task syz.1.33:4111 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.33 state:D stack:13880 pid:4111 ppid:2930 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x56d/0x870 kernel/sched/core.c:6561
schedule+0x50/0xb0 kernel/sched/core.c:6637
rwsem_down_write_slowpath+0x32e/0x750 kernel/locking/rwsem.c:1189
mmap_write_lock include/linux/mmap_lock.h:71 [inline]
exit_mmap+0x1c3/0x410 mm/mmap.c:3258
__mmput+0x28/0xf0 kernel/fork.c:1200
exit_mm+0xb3/0x110 kernel/exit.c:565
do_exit+0x23a/0x9f0 kernel/exit.c:867
do_group_exit+0x9a/0xa0 kernel/exit.c:1022
__do_sys_exit_group kernel/exit.c:1033 [inline]
__se_sys_exit_group kernel/exit.c:1031 [inline]
__x64_sys_exit_group+0xe/0x10 kernel/exit.c:1031
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f54edcbeec9
RSP: 002b:00007ffda39307b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f54edcbeec9
RDX: 00007f54edcbeec9 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffda393081c R08: 00000005a39308af R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000008
R13: 00000000000927c0 R14: 000000000000f54d R15: 00007ffda3930870
INFO: task modprobe:4115 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:modprobe state:D stack:12824 pid:4115 ppid:9 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x56d/0x870 kernel/sched/core.c:6561
schedule+0x50/0xb0 kernel/sched/core.c:6637
rwsem_down_write_slowpath+0x32e/0x750 kernel/locking/rwsem.c:1189
mmap_write_lock include/linux/mmap_lock.h:71 [inline]
exit_mmap+0x1c3/0x410 mm/mmap.c:3258
__mmput+0x28/0xf0 kernel/fork.c:1200
exit_mm+0xb3/0x110 kernel/exit.c:565
do_exit+0x23a/0x9f0 kernel/exit.c:867
do_group_exit+0x9a/0xa0 kernel/exit.c:1022
__do_sys_exit_group kernel/exit.c:1033 [inline]
__se_sys_exit_group kernel/exit.c:1031 [inline]
__x64_sys_exit_group+0xe/0x10 kernel/exit.c:1031
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7d5f9156c5
RSP: 002b:00007ffc2d1b1768 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f7d5fa16fe8 RCX: 00007f7d5f9156c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffc2d1b16f8 R09: 0000000000000000
R10: 00007ffc2d1b1590 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f7d5fa15680 R15: 00007f7d5fa17000
Showing all locks held in the system:
2 locks held by kworker/u4:0/9:
#0: ffff888100068938 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
#1: ffffc90000053e68 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
2 locks held by kworker/u4:1/11:
#0: ffff888100068938 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
#1: ffffc90000063e68 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff831859e8 (rcu_tasks.tasks_gp_mutex){....}-{3:3}, at: rcu_tasks_one_gp kernel/rcu/tasks.h:517 [inline]
#0: ffffffff831859e8 (rcu_tasks.tasks_gp_mutex){....}-{3:3}, at: rcu_tasks_kthread+0x97/0x4c0 kernel/rcu/tasks.h:562
1 lock held by rcu_tasks_trace/13:
#0: ffffffff83186010 (rcu_tasks_trace.tasks_gp_mutex){....}-{3:3}, at: rcu_tasks_one_gp kernel/rcu/tasks.h:517 [inline]
#0: ffffffff83186010 (rcu_tasks_trace.tasks_gp_mutex){....}-{3:3}, at: rcu_tasks_kthread+0x97/0x4c0 kernel/rcu/tasks.h:562
1 lock held by khungtaskd/28:
#0: ffffffff831857a8 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff831857a8 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff831857a8 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2a/0xf0 kernel/locking/lockdep.c:6513
2 locks held by kworker/u4:2/34:
#0: ffff888100068938 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
#1: ffffc9000033be68 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
2 locks held by getty/1953:
#0: ffff888106ef4098 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x1c/0x40 drivers/tty/tty_ldisc.c:244
#1: ffffc900080eb2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x19e/0x6d0 drivers/tty/n_tty.c:2198
2 locks held by kworker/u4:3/2029:
#0: ffff888100068938 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
#1: ffffc90000eebe68 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
2 locks held by kworker/u4:6/2052:
#0: ffff888100068938 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
#1: ffffc90000e5be68 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
1 lock held by syz-executor/2600:
#0: ffff888104e4ed58 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888104e4ed58 (&mm->mmap_lock){....}-{3:3}, at: vm_mmap_pgoff+0x8d/0x170 mm/util.c:518
2 locks held by kworker/u4:7/2630:
#0: ffff888100068938 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
#1: ffffc90000eb3e68 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work+0x223/0x4c0 kernel/workqueue.c:2267
1 lock held by syz-executor/2937:
#0: ffff888104e4d258 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888104e4d258 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.6.25/4068:
#0: ffff888116073098 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888116073098 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by modprobe/4072:
#0: ffff888116075fd8 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888116075fd8 (&mm->mmap_lock){....}-{3:3}, at: vm_mmap_pgoff+0x8d/0x170 mm/util.c:518
1 lock held by syz.5.32/4110:
#0: ffff888104e4b758 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888104e4b758 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.1.33/4111:
#0: ffff888104e4a9d8 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888104e4a9d8 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by modprobe/4115:
#0: ffff888104e49598 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888104e49598 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.7.34/4827:
#0: ffff888104e4f418 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888104e4f418 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by modprobe/4829:
#0: ffff888104e48818 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888104e48818 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.3.761/6641:
#0: ffff888116073e18 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888116073e18 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.8.1620/8447:
#0: ffff888116072318 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888116072318 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.0.1557/8449:
#0: ffff888116074b98 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888116074b98 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.4.1622/8924:
#0: ffff888126411598 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888126411598 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.2.1623/8926:
#0: ffff888126412318 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888126412318 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.6.1624/9399:
#0: ffff888116071598 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888116071598 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz-executor/9770:
#0: ffff888116070ed8 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888116070ed8 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.5.1941/10508:
#0: ffff888100058818 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888100058818 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.1.1942/10512:
#0: ffff888126410158 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888126410158 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by modprobe/10516:
#0: ffff888126416d58 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888126416d58 (&mm->mmap_lock){....}-{3:3}, at: vm_mmap_pgoff+0x8d/0x170 mm/util.c:518
1 lock held by modprobe/10517:
#0: ffff88810005dfd8 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff88810005dfd8 (&mm->mmap_lock){....}-{3:3}, at: vm_mmap_pgoff+0x8d/0x170 mm/util.c:518
1 lock held by syz.8.2214/11977:
#0: ffff888126413e18 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888126413e18 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by modprobe/11981:
#0: ffff888116076d58 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888116076d58 (&mm->mmap_lock){....}-{3:3}, at: vm_mmap_pgoff+0x8d/0x170 mm/util.c:518
1 lock held by syz.3.2330/11982:
#0: ffff888116077418 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff888116077418 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.2.2334/12456:
#0: ffff88812897a318 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff88812897a318 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
1 lock held by syz.4.2332/12457:
#0: ffff88812897b098 (&mm->mmap_lock){....}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff88812897b098 (&mm->mmap_lock){....}-{3:3}, at: exit_mmap+0x1c3/0x410 mm/mmap.c:3258
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0x74/0xbb lib/dump_stack.c:106
nmi_cpu_backtrace+0x102/0x160 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0xa5/0x160 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0x533/0x560 kernel/hung_task.c:377
kthread+0xcc/0xe0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741