ci2 starts bisection 2024-03-28 22:57:53.006191485 +0000 UTC m=+33633.613513064 bisecting fixing commit since fb2635ac69abac0060cc2be2873dc4f524f12e66 building syzkaller on cb976f63e0177b96eb9ce1c631cc5e2c4b4b0759 ensuring issue is reproducible on original commit fb2635ac69abac0060cc2be2873dc4f524f12e66 testing commit fb2635ac69abac0060cc2be2873dc4f524f12e66 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 641278a97f0c0b3d55a3d7656b05145234a3767eab87657dd28e8a0f5d4d55e5 all runs: crashed: WARNING in kernfs_remove_by_name_ns representative crash: WARNING in kernfs_remove_by_name_ns, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit fb2635ac69abac0060cc2be2873dc4f524f12e66 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4e3818bed3dd16529f5909d4ce5ed691d2c31f9993c14b161264c6ee36c8f8e8 all runs: crashed: WARNING in kernfs_remove_by_name_ns representative crash: WARNING in kernfs_remove_by_name_ns, types: [WARNING] the bug reproduces without the instrumentation disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed kconfig minimization: base=7493 full=9695 leaves diff=1933 split chunks (needed=false): <1933> split chunk #0 of len 1933 into 5 parts testing without sub-chunk 1/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit fb2635ac69abac0060cc2be2873dc4f524f12e66 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4c390295b33b664662edcfbfce616996b1399a22635b91fe2235fc3fc1469f78 all runs: crashed: WARNING in kernfs_remove_by_name_ns representative crash: WARNING in kernfs_remove_by_name_ns, types: [WARNING] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit fb2635ac69abac0060cc2be2873dc4f524f12e66 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7bffbb69ca69fff7a95b3f081d55f378a283147161fcbd7a7cc58b1d56d26bf5 all runs: boot failed: can't ssh into the instance unable to determine the verdict: 0 good runs (wanted 5), for bad wanted 5 in total, got 0 testing without sub-chunk 3/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit fb2635ac69abac0060cc2be2873dc4f524f12e66 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4c7a471c0f5e752516eadf914a650fe1d3816f731708dfab0bc8764af7e040dc all runs: crashed: WARNING in kernfs_remove_by_name_ns representative crash: WARNING in kernfs_remove_by_name_ns, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing commit fb2635ac69abac0060cc2be2873dc4f524f12e66 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3c6ffd43677337a88a89a589e2558690c56904e3deac07981052821c198c27cf all runs: crashed: WARNING in kernfs_remove_by_name_ns representative crash: WARNING in kernfs_remove_by_name_ns, types: [WARNING] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit fb2635ac69abac0060cc2be2873dc4f524f12e66 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 546d00112f16c3722dfabca483905478ea045f9db6c100f889d89521e0fe8ad6 all runs: crashed: WARNING in kernfs_remove_by_name_ns representative crash: WARNING in kernfs_remove_by_name_ns, types: [WARNING] the chunk can be dropped minimized to 387 configs; suspects: [6LOWPAN ACPI_VIDEO DLM DRM DRM_TTM DRM_TTM_HELPER DRM_UDL DRM_V3D DRM_VC4 DRM_VGEM DRM_VIRTIO_GPU DRM_VKMS DRM_VRAM_HELPER DUMMY DVB_AF9013 DVB_AF9033 DVB_AS102 DVB_AS102_FE DVB_B2C2_FLEXCOP DVB_B2C2_FLEXCOP_USB 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_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 E100 ECRYPT_FS ECRYPT_FS_MESSAGING EEPROM_93CX6 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 EXFAT_FS EXPORTFS_BLOCK_OPS EXT3_FS_POSIX_ACL EXT3_FS_SECURITY EXT4_FS_SECURITY 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 FB_DEFERRED_IO FB_SYS_COPYAREA FB_SYS_FILLRECT FB_SYS_FOPS FB_SYS_IMAGEBLIT FB_TILEBLITTING FB_VIRTUAL FDDI FIB_RULES FIREWIRE FIREWIRE_NET FIREWIRE_OHCI FIREWIRE_SBP2 FRAMEBUFFER_CONSOLE_ROTATION FRONTSWAP FS_DAX FS_DAX_PMD FS_ENCRYPTION FS_ENCRYPTION_ALGS FS_VERITY FS_VERITY_BUILTIN_SIGNATURES FTL FW_LOADER_COMPRESS FW_LOADER_USER_HELPER_FALLBACK GACT_PROB GET_FREE_REGION GFS2_FS GFS2_FS_LOCKING_DLM GOOGLE_COREBOOT_TABLE GOOGLE_FIRMWARE GOOGLE_MEMCONSOLE GOOGLE_MEMCONSOLE_COREBOOT GOOGLE_VPD GPIO_DLN2 GPIO_VIPERBOARD GREENASIA_FF GREYBUS GREYBUS_BRIDGED_PHY GREYBUS_ES2 GREYBUS_HID GREYBUS_USB GTP GVE HAVE_ARCH_USERFAULTFD_MINOR HAVE_IMA_KEXEC HDLC HDLC_CISCO HDLC_FR HDLC_PPP HDLC_RAW HDLC_RAW_ETH HDLC_X25 HDMI HFSPLUS_FS HFS_FS HIDRAW HID_ACCUTOUCH HID_ACRUX HID_ACRUX_FF HID_ALPS HID_APPLEIR HID_ASUS HID_AUREAL HID_BATTERY_STRENGTH HID_BETOP_FF HID_CMEDIA HID_CORSAIR HID_CP2112 HID_ELECOM HID_ELO HID_EMS_FF HID_GEMBIRD HID_GFRM HID_GREENASIA HID_GT683R HID_GYRATION HID_HOLTEK HID_ICADE HID_KEYTOUCH HID_KYE HID_LCPOWER HID_LED HID_LENOVO HID_LOGITECH_DJ HID_LOGITECH_HIDPP HID_MAGICMOUSE HID_MAYFLASH HID_NTI HID_NTRIG HID_ORTEK HID_PENMOUNT HID_PETALYNX HID_PICOLCD HID_PICOLCD_BACKLIGHT HID_PICOLCD_CIR HID_PICOLCD_FB HID_PICOLCD_LCD HID_PICOLCD_LEDS HID_PID HID_PLANTRONICS HID_PRIMAX HID_PRODIKEYS HID_RETRODE HID_RMI HID_ROCCAT HID_SAITEK HID_SAMSUNG HID_SENSOR_ACCEL_3D HID_SENSOR_ALS 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_SPEEDLINK HID_STEELSERIES HID_SUNPLUS HID_THINGM HID_TIVO HID_TOPSEED HID_TWINHAN HID_UCLOGIC HID_UDRAW_PS3 HID_WACOM HID_WALTOP HID_WIIMOTE HID_XINMO HID_ZYDACRON HMM_MIRROR HOLTEK_FF HOTPLUG_PCI_PCIE HPFS_FS I2C_DIOLAN_U2C I2C_DLN2 I2C_MUX_REG I2C_ROBOTFUZZ_OSIF I2C_SI4713 I2C_SLAVE_EEPROM I2C_TINY_USB I2C_VIPERBOARD IEEE802154 IEEE802154_6LOWPAN IEEE802154_ATUSB IEEE802154_DRIVERS IEEE802154_HWSIM IEEE802154_NL802154_EXPERIMENTAL IEEE802154_SOCKET IFB 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_AH INET6_ESP INET6_ESPINTCP INET6_ESP_OFFLOAD INET6_IPCOMP INET6_TUNNEL INET6_XFRM_TUNNEL INET_AH INET_DCCP_DIAG INET_DIAG_DESTROY INET_ESP INET_ESPINTCP INET_ESP_OFFLOAD INET_IPCOMP INET_MPTCP_DIAG INET_RAW_DIAG INET_SCTP_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_JOYSTICK 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 IP6_NF_MATCH_AH IP6_NF_MATCH_EUI64 IP6_NF_MATCH_FRAG IP6_NF_MATCH_HL IP6_NF_MATCH_IPV6HEADER IP6_NF_MATCH_MH IP6_NF_MATCH_OPTS IP6_NF_MATCH_RPFILTER IP6_NF_MATCH_RT IP6_NF_MATCH_SRH IP6_NF_RAW IP6_NF_SECURITY IP6_NF_TARGET_HL 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_ADVANCED_ROUTER IP_DCCP IP_DCCP_CCID3 IP_DCCP_TFRC_LIB IP_FIB_TRIE_STATS IP_MROUTE IP_MROUTE_COMMON 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_CLUSTERIP IP_NF_TARGET_ECN IP_NF_TARGET_NETMAP IP_NF_TARGET_REDIRECT IP_NF_TARGET_SYNPROXY IP_NF_TARGET_TTL IP_PIMSM_V1 IP_PIMSM_V2 IP_PNP_RARP IP_ROUTE_CLASSID IP_ROUTE_MULTIPATH IP_ROUTE_VERBOSE 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_DH IP_VS_FO IP_VS_FTP IP_VS_IPV6 IP_VS_LBLC IP_VS_LBLCR IP_VS_LC IP_VS_MH IP_VS_NFCT IP_VS_NQ IP_VS_OVF IP_VS_PE_SIP IP_VS_PROTO_AH IP_VS_PROTO_AH_ESP IP_VS_PROTO_ESP IP_VS_PROTO_SCTP IP_VS_PROTO_TCP IP_VS_PROTO_UDP IP_VS_RR IP_VS_SED IP_VS_SH IP_VS_TWOS IP_VS_WLC IP_VS_WRR IR_IGORPLUGUSB IR_IGUANA IR_IMON IR_MCEUSB IR_REDRAT3 IR_STREAMZAP IR_TTUSBIR ISDN ISDN_CAPI_MIDDLEWARE ISO9660_FS JFFS2_CMODE_PRIORITY JFFS2_COMPRESSION_OPTIONS JFFS2_FS JFFS2_FS_POSIX_ACL JFFS2_FS_SECURITY JFFS2_FS_WRITEBUFFER JFFS2_FS_XATTR JFFS2_LZO JFFS2_RTIME JFFS2_RUBIN JFFS2_SUMMARY JFFS2_ZLIB JFS_DEBUG JFS_FS JFS_POSIX_ACL JFS_SECURITY JOLIET JOYSTICK_IFORCE JOYSTICK_IFORCE_USB JOYSTICK_XPAD JOYSTICK_XPAD_FF JOYSTICK_XPAD_LEDS KARMA_PARTITION KCOV KCOV_ENABLE_COMPARISONS KCOV_INSTRUMENT_ALL KEYS_REQUEST_CACHE LAPB LCD_CLASS_DEVICE MAC802154 MEDIA_RADIO_SUPPORT MEDIA_TEST_SUPPORT MFD_DLN2 MFD_VIPERBOARD MPTCP NET_IPGRE_DEMUX NFT_FWD_NETDEV NF_CONNTRACK_FTP NF_CONNTRACK_SIP NF_TABLES NF_TABLES_NETDEV PARTITION_ADVANCED RADIO_ADAPTERS RADIO_SI4713 RFKILL SND SND_SOC SOUND WAN XFRM ZONE_DEVICE] disabling configs for [UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing current HEAD e5cd595e23c1a075359a337c0e5c3a4f2dc28dd1 testing commit e5cd595e23c1a075359a337c0e5c3a4f2dc28dd1 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: aa3fe5c9050572ccaa44ea45ccedcc44e9168dd215a7e77788955cf7916b8fb7 all runs: crashed: WARNING in kernfs_remove_by_name_ns representative crash: WARNING in kernfs_remove_by_name_ns, types: [WARNING] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 2h40m50.489246184s (build: 1h24m3.38164418s, test: 1h13m52.138062556s) crash still not fixed or there were kernel test errors commit msg: Linux 6.1.83 crash: WARNING in kernfs_remove_by_name_ns ------------[ cut here ]------------ kernfs: can not remove 'nr_tags', no directory WARNING: CPU: 0 PID: 4387 at fs/kernfs/dir.c:1640 kernfs_remove_by_name_ns+0xb4/0x110 Modules linked in: CPU: 0 PID: 4387 Comm: syz-executor102 Not tainted 6.1.83-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kernfs_remove_by_name_ns+0xb4/0x110 lr : kernfs_remove_by_name_ns+0xb0/0x110 fs/kernfs/dir.c:1639 sp : ffff80001407bac0 x29: ffff80001407bac0 x28: ffff80000bcd1000 x27: ffff0000c4e06d08 x26: ffff0000c4e06d08 x25: ffff80001407bbe8 x24: ffff0000cc0e6e00 x23: ffff0000c68c0000 x22: 0000000000000000 x21: 0000000000000000 x20: 00000000fffffffe x19: 0000000000000000 x18: 0000000000000000 x17: ffff80000d3bf688 x16: 0000000000001167 x15: 0000000000000000 x14: 0000000000000000 x13: 205d373833345420 x12: ffff80000d183000 x11: 0000000000ff0100 x10: 0000000000000000 x9 : 97d781c1feb23c00 x8 : 97d781c1feb23c00 x7 : 0000000000000000 x6 : ffff80000ae0fcf4 x5 : 0000000000000000 x4 : 0000000000000080 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: kernfs_remove_by_name_ns+0xb4/0x110 kernfs_remove_by_name include/linux/kernfs.h:622 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0x68/0x160 fs/sysfs/group.c:288 sysfs_remove_groups+0x3c/0x78 fs/sysfs/group.c:312 __kobject_del+0x34/0x134 lib/kobject.c:587 kobject_del+0x2c/0x4c lib/kobject.c:619 blk_mq_unregister_hctx block/blk-mq-sysfs.c:181 [inline] blk_mq_sysfs_unregister_hctxs+0xc4/0x13c block/blk-mq-sysfs.c:309 __blk_mq_update_nr_hw_queues block/blk-mq.c:4745 [inline] blk_mq_update_nr_hw_queues+0x24c/0x6c8 block/blk-mq.c:4791 nbd_start_device+0xc4/0x510 drivers/block/nbd.c:1364 nbd_start_device_ioctl drivers/block/nbd.c:1415 [inline] __nbd_ioctl drivers/block/nbd.c:1491 [inline] nbd_ioctl+0x228/0x66c drivers/block/nbd.c:1531 blkdev_ioctl+0x218/0x664 block/ioctl.c:618 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xd0/0x148 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x64/0x178 arch/arm64/kernel/syscall.c:52 el0_svc_common+0xb8/0x174 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x174 arch/arm64/kernel/syscall.c:206 el0_svc+0x34/0x110 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ kernfs: can not remove 'nr_reserved_tags', no directory WARNING: CPU: 0 PID: 4387 at fs/kernfs/dir.c:1640 kernfs_remove_by_name_ns+0xb4/0x110 Modules linked in: CPU: 0 PID: 4387 Comm: syz-executor102 Tainted: G W 6.1.83-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kernfs_remove_by_name_ns+0xb4/0x110 lr : kernfs_remove_by_name_ns+0xb0/0x110 fs/kernfs/dir.c:1639 sp : ffff80001407bac0 x29: ffff80001407bac0 x28: ffff80000bcd1000 x27: ffff0000c4e06d08 x26: ffff0000c4e06d08 x25: ffff80001407bbe8 x24: ffff0000cc0e6e00 x23: ffff0000c68c0000 x22: 0000000000000000 x21: 0000000000000000 x20: 00000000fffffffe x19: 0000000000000000 x18: 0000000000000000 x17: ffff80000d3bf688 x16: 0000000000001167 x15: 0000000000000000 x14: 0000000000000000 x13: 205d373833345420 x12: ffff80000d183000 x11: 0000000000ff0100 x10: 0000000000000000 x9 : 97d781c1feb23c00 x8 : 97d781c1feb23c00 x7 : 0000000000000000 x6 : ffff80000ae0b6c0 x5 : 0000000000000000 x4 : 0000000000000080 x3 : ffff0001fe9dcea8 x2 : ffff0001fe9dcea8 x1 : ffff80000b9a3c29 x0 : 0000000000000001 Call trace: kernfs_remove_by_name_ns+0xb4/0x110 kernfs_remove_by_name include/linux/kernfs.h:622 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0x68/0x160 fs/sysfs/group.c:288 sysfs_remove_groups+0x3c/0x78 fs/sysfs/group.c:312 __kobject_del+0x34/0x134 lib/kobject.c:587 kobject_del+0x2c/0x4c lib/kobject.c:619 blk_mq_unregister_hctx block/blk-mq-sysfs.c:181 [inline] blk_mq_sysfs_unregister_hctxs+0xc4/0x13c block/blk-mq-sysfs.c:309 __blk_mq_update_nr_hw_queues block/blk-mq.c:4745 [inline] blk_mq_update_nr_hw_queues+0x24c/0x6c8 block/blk-mq.c:4791 nbd_start_device+0xc4/0x510 drivers/block/nbd.c:1364 nbd_start_device_ioctl drivers/block/nbd.c:1415 [inline] __nbd_ioctl drivers/block/nbd.c:1491 [inline] nbd_ioctl+0x228/0x66c drivers/block/nbd.c:1531 blkdev_ioctl+0x218/0x664 block/ioctl.c:618 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xd0/0x148 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x64/0x178 arch/arm64/kernel/syscall.c:52 el0_svc_common+0xb8/0x174 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x174 arch/arm64/kernel/syscall.c:206 el0_svc+0x34/0x110 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ kernfs: can not remove 'cpu_list', no directory WARNING: CPU: 0 PID: 4387 at fs/kernfs/dir.c:1640 kernfs_remove_by_name_ns+0xb4/0x110 Modules linked in: CPU: 0 PID: 4387 Comm: syz-executor102 Tainted: G W 6.1.83-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kernfs_remove_by_name_ns+0xb4/0x110 lr : kernfs_remove_by_name_ns+0xb0/0x110 fs/kernfs/dir.c:1639 sp : ffff80001407bac0 x29: ffff80001407bac0 x28: ffff80000bcd1000 x27: ffff0000c4e06d08 x26: ffff0000c4e06d08 x25: ffff80001407bbe8 x24: ffff0000cc0e6e00 x23: ffff0000c68c0000 x22: 0000000000000000 x21: 0000000000000000 x20: 00000000fffffffe x19: 0000000000000000 x18: 0000000000000000 x17: ffff80000d3bf688 x16: 0000000000001167 x15: 0000000000000000 x14: 0000000000000000 x13: 205d373833345420 x12: ffff80000d183000 x11: 0000000000ff0100 x10: 0000000000000000 x9 : 97d781c1feb23c00 x8 : 97d781c1feb23c00 x7 : 0000000000000000 x6 : ffff80000ae0fcf4 x5 : 0000000000000000 x4 : 0000000000000080 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: kernfs_remove_by_name_ns+0xb4/0x110 kernfs_remove_by_name include/linux/kernfs.h:622 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0x68/0x160 fs/sysfs/group.c:288 sysfs_remove_groups+0x3c/0x78 fs/sysfs/group.c:312 __kobject_del+0x34/0x134 lib/kobject.c:587 kobject_del+0x2c/0x4c lib/kobject.c:619 blk_mq_unregister_hctx block/blk-mq-sysfs.c:181 [inline] blk_mq_sysfs_unregister_hctxs+0xc4/0x13c block/blk-mq-sysfs.c:309 __blk_mq_update_nr_hw_queues block/blk-mq.c:4745 [inline] blk_mq_update_nr_hw_queues+0x24c/0x6c8 block/blk-mq.c:4791 nbd_start_device+0xc4/0x510 drivers/block/nbd.c:1364 nbd_start_device_ioctl drivers/block/nbd.c:1415 [inline] __nbd_ioctl drivers/block/nbd.c:1491 [inline] nbd_ioctl+0x228/0x66c drivers/block/nbd.c:1531 blkdev_ioctl+0x218/0x664 block/ioctl.c:618 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xd0/0x148 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x64/0x178 arch/arm64/kernel/syscall.c:52 el0_svc_common+0xb8/0x174 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x174 arch/arm64/kernel/syscall.c:206 el0_svc+0x34/0x110 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 ---[ end trace 0000000000000000 ]--- block nbd0: shutting down sockets