ci starts bisection 2024-09-08 09:16:42.563420919 +0000 UTC m=+112132.022608411 bisecting cause commit starting from f723224742fc6d25f88a9d9036be4713398be65d building syzkaller on 9750182a9a67f35e95cb1e077a3b69a4a9b54083 ensuring issue is reproducible on original commit f723224742fc6d25f88a9d9036be4713398be65d testing commit f723224742fc6d25f88a9d9036be4713398be65d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9cbcf839fab02cf68ba2b9ae5bdca3898de2a122d6b583e649041ded7b86bea5 all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] check whether we can drop unnecessary instrumentation disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit f723224742fc6d25f88a9d9036be4713398be65d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 036283174e1e5292dbc898af2155bf15138969b8cc1a768ee6abe6d5fe221ca4 all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] the bug reproduces without the instrumentation disabling configs for [UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed kconfig minimization: base=4045 full=8138 leaves diff=2106 split chunks (needed=false): <2106> split chunk #0 of len 2106 into 5 parts testing without sub-chunk 1/5 disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit f723224742fc6d25f88a9d9036be4713398be65d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 00669a910f98a4360b3314f1b24ee882199ed559e9ed32c2f256dc276f6ef55e all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing commit f723224742fc6d25f88a9d9036be4713398be65d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e1c5aecc301701059c8970bc4e17af3f68546bf982d718bb02dd7ba3632c2143 run #0: crashed: KFENCE: use-after-free in set_powered_sync run #1: crashed: KASAN: slab-use-after-free Read in set_powered_sync run #2: crashed: KASAN: slab-use-after-free Read in set_powered_sync run #3: crashed: KASAN: slab-use-after-free Read in set_powered_sync run #4: crashed: KASAN: slab-use-after-free Read in set_powered_sync run #5: crashed: KASAN: slab-use-after-free Read in set_powered_sync run #6: crashed: KASAN: slab-use-after-free Read in set_powered_sync run #7: crashed: KASAN: slab-use-after-free Read in set_powered_sync run #8: crashed: KASAN: slab-use-after-free Read in set_powered_sync run #9: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed testing commit f723224742fc6d25f88a9d9036be4713398be65d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fff7226aa3584fe90ac46210eeba1c0de67ea4dc43ceb21a1682ea94bfbb1fe5 all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed testing commit f723224742fc6d25f88a9d9036be4713398be65d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fb53600e24755b67b304af049d229359e7ec9596f249b73feb46c76836b4a40f all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit f723224742fc6d25f88a9d9036be4713398be65d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 868b9ee36b78063345e0b771b4c062ba59db875ae855aadc13509d99297de160 all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] the chunk can be dropped minimized to 422 configs; suspects: [6LOWPAN 6LOWPAN_GHC_EXT_HDR_DEST 6LOWPAN_GHC_EXT_HDR_FRAG 6LOWPAN_GHC_EXT_HDR_HOP 6LOWPAN_GHC_EXT_HDR_ROUTE 6LOWPAN_GHC_ICMPV6 6LOWPAN_GHC_UDP 6LOWPAN_NHC 6LOWPAN_NHC_DEST 6LOWPAN_NHC_FRAGMENT 6LOWPAN_NHC_HOP 6LOWPAN_NHC_IPV6 6LOWPAN_NHC_MOBILITY 6LOWPAN_NHC_ROUTING 6LOWPAN_NHC_UDP 6PACK 842_COMPRESS 842_DECOMPRESS 9P_FSCACHE 9P_FS_POSIX_ACL 9P_FS_SECURITY ACORN_PARTITION ACORN_PARTITION_ADFS ACORN_PARTITION_CUMANA ACORN_PARTITION_EESOX ACORN_PARTITION_ICS ACORN_PARTITION_POWERTEC ACORN_PARTITION_RISCIX ACPI_NFIT ACPI_NHLT ACPI_PLATFORM_PROFILE ADDRESS_MASKING ADFS_FS AFFS_FS AFS_FS AFS_FSCACHE AF_KCM AF_RXRPC AF_RXRPC_IPV6 AIX_PARTITION AMD_SFH_HID AMIGA_PARTITION ANDROID_BINDERFS ANDROID_BINDER_IPC ANON_VMA_NAME APERTURE_HELPERS APPLE_MFI_FASTCHARGE AR5523 ARCH_ENABLE_MEMORY_HOTREMOVE ARCH_ENABLE_THP_MIGRATION ARCH_USES_PG_UNCACHED ARCH_WANT_PMD_MKWRITE ASM_MODVERSIONS ASUS_TF103C_DOCK ASYNC_CORE ASYNC_MEMCPY ASYNC_PQ ASYNC_RAID6_RECOV ASYNC_TX_DMA ASYNC_XOR ATARI_PARTITION ATA_GENERIC ATA_OVER_ETH ATH10K ATH10K_CE ATH10K_LEDS ATH10K_PCI ATH10K_USB ATH11K ATH6KL ATH6KL_USB ATH9K ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_CHANNEL_CONTEXT ATH9K_COMMON ATH9K_COMMON_DEBUG ATH9K_COMMON_SPECTRAL ATH9K_DEBUGFS ATH9K_DYNACK ATH9K_HTC ATH9K_HTC_DEBUGFS ATH9K_HW ATH9K_PCI ATH9K_PCOEM ATH9K_RFKILL ATH_COMMON ATM ATM_BR2684 ATM_CLIP ATM_DRIVERS ATM_LANE ATM_MPOA ATM_TCP AUXILIARY_BUS AX25 AX25_DAMA_SLAVE AX88796B_PHY BAREUDP BATMAN_ADV BATMAN_ADV_BATMAN_V BATMAN_ADV_BLA BATMAN_ADV_DAT BATMAN_ADV_MCAST BATMAN_ADV_NC BCACHE BCACHEFS_DEBUG BCACHEFS_ERASURE_CODING BCACHEFS_FS BCACHEFS_POSIX_ACL BCACHEFS_QUOTA BCACHEFS_SIX_OPTIMISTIC_SPIN BCMA BCMA_HOST_PCI_POSSIBLE BEFS_FS BFQ_CGROUP_DEBUG BFQ_GROUP_IOSCHED BFS_FS BIG_KEYS BLK_CGROUP_PUNT_BIO BLK_CGROUP_RWSTAT BLK_DEV_BSGLIB BLK_DEV_INTEGRITY BLK_DEV_NBD BLK_DEV_NULL_BLK BLK_DEV_NULL_BLK_FAULT_INJECTION BLK_DEV_NVME BLK_DEV_PMEM BLK_DEV_RAM BLK_DEV_RNBD BLK_DEV_RNBD_CLIENT BLK_DEV_THROTTLING BLK_DEV_ZONED BLK_ICQ BLK_INLINE_ENCRYPTION BLK_INLINE_ENCRYPTION_FALLBACK BLK_WBT BLK_WBT_MQ BONDING BOOT_VESA_SUPPORT BPF_EVENTS BPF_JIT BPF_JIT_ALWAYS_ON BPF_JIT_DEFAULT_ON BPF_LSM BPF_PRELOAD BPF_PRELOAD_UMD BPF_STREAM_PARSER BPF_SYSCALL BPQETHER BRIDGE BRIDGE_CFM BRIDGE_EBT_802_3 BRIDGE_EBT_AMONG BRIDGE_EBT_ARP BRIDGE_EBT_ARPREPLY BRIDGE_EBT_BROUTE BRIDGE_EBT_DNAT BRIDGE_EBT_IP BRIDGE_EBT_IP6 BRIDGE_EBT_LIMIT BRIDGE_EBT_LOG BRIDGE_EBT_MARK BRIDGE_EBT_MARK_T BRIDGE_EBT_NFLOG BRIDGE_EBT_PKTTYPE BRIDGE_EBT_REDIRECT BRIDGE_EBT_SNAT BRIDGE_EBT_STP BRIDGE_EBT_T_FILTER BRIDGE_EBT_T_NAT BRIDGE_EBT_VLAN BRIDGE_IGMP_SNOOPING BRIDGE_MRP BRIDGE_NF_EBTABLES BRIDGE_NF_EBTABLES_LEGACY BRIDGE_VLAN_FILTERING BSD_DISKLABEL BSD_PROCESS_ACCT_V3 BT BTRFS_ASSERT BTRFS_FS BTRFS_FS_POSIX_ACL BTRFS_FS_REF_VERIFY BTT BT_6LOWPAN BT_ATH3K BT_BCM BT_BNEP BT_BNEP_MC_FILTER BT_BNEP_PROTO_FILTER BT_BREDR BT_CMTP BT_HCIBCM203X BT_HCIBFUSB BT_HCIBPA10X BT_HCIBTUSB BT_HCIBTUSB_AUTOSUSPEND BT_HCIBTUSB_BCM BT_HCIBTUSB_MTK BT_HCIBTUSB_POLL_SYNC BT_HCIBTUSB_RTL BT_HCIUART BT_HCIUART_3WIRE BT_HCIUART_AG6XX BT_HCIUART_BCSP BT_HCIUART_H4 BT_HCIUART_LL BT_HCIUART_MRVL BT_HCIUART_QCA BT_HCIUART_SERDEV BT_HCIVHCI BT_INTEL BT_LE BT_LEDS BT_LE_L2CAP_ECRED BT_MRVL BT_MRVL_SDIO BT_MSFTEXT BT_MTK BT_MTKSDIO BT_MTKUART BT_QCA BT_RFCOMM BT_RFCOMM_TTY BT_RTL CACHEFILES CAIF CAIF_DEBUG CAIF_DRIVERS CAIF_NETDEV CAIF_TTY CAIF_USB CAIF_VIRTIO CAN CAN_8DEV_USB CAN_BCM CAN_CALC_BITTIMING CAN_DEV CAN_EMS_USB CAN_ESD_USB CAN_ETAS_ES58X CAN_F81604 CAN_GS_USB CAN_GW CAN_IFI_CANFD CAN_ISOTP CAN_J1939 CAN_KVASER_USB CAN_MCBA_USB CAN_NETLINK CAN_PEAK_USB CAN_RAW CAN_RX_OFFLOAD CAN_SLCAN CAN_UCAN CAN_VCAN CAN_VXCAN CAPI_TRACE CARL9170 CARL9170_HWRNG CARL9170_LEDS CARL9170_WPC CEC_CORE CEPH_FS CEPH_FSCACHE CEPH_FS_POSIX_ACL CEPH_LIB CEPH_LIB_USE_DNS_RESOLVER CFG80211 CFG80211_CRDA_SUPPORT CFG80211_DEBUGFS CFG80211_DEFAULT_PS CFG80211_REQUIRE_SIGNED_REGDB CFG80211_USE_KERNEL_REGDB_KEYS CFG80211_WEXT CFS_BANDWIDTH CGROUP_BPF CHARGER_ISP1704 CHR_DEV_ST CIFS CIFS_ALLOW_INSECURE_LEGACY CIFS_DEBUG CIFS_DFS_UPCALL CIFS_FSCACHE CIFS_POSIX CIFS_SMB_DIRECT CIFS_SWN_UPCALL CIFS_UPCALL CIFS_XATTR CLOSURES CLS_U32_MARK CLS_U32_PERF CMA CMA_SIZE_SEL_MAX CMDLINE_PARTITION COMEDI COMEDI_DT9812 COMEDI_NI_USB6501 COMEDI_USBDUX COMEDI_USBDUXFAST COMEDI_USBDUXSIGMA COMEDI_USB_DRIVERS COMEDI_VMK80XX COMPAT_NETLINK_MESSAGES COUNTER CRAMFS CRAMFS_BLOCKDEV CRAMFS_MTD CRC4 CRC64 CRC64_ROCKSOFT CRC7 CRC8 CRC_ITU_T CRC_T10DIF CRYPTO_ADIANTUM CRYPTO_AEGIS128 CRYPTO_AEGIS128_AESNI_SSE2 CRYPTO_AES_NI_INTEL CRYPTO_AES_TI CRYPTO_ANSI_CPRNG CRYPTO_ANUBIS CRYPTO_ARC4 CRYPTO_ARCH_HAVE_LIB_BLAKE2S CRYPTO_ARCH_HAVE_LIB_CHACHA CRYPTO_ARCH_HAVE_LIB_CURVE25519 CRYPTO_ARCH_HAVE_LIB_POLY1305 CRYPTO_ARIA CRYPTO_ARIA_AESNI_AVX_X86_64 CRYPTO_BLAKE2B CRYPTO_BLAKE2S_X86 CRYPTO_BLOWFISH CRYPTO_BLOWFISH_COMMON CRYPTO_BLOWFISH_X86_64 CRYPTO_CAMELLIA CRYPTO_CAMELLIA_AESNI_AVX2_X86_64 CRYPTO_CAMELLIA_AESNI_AVX_X86_64 CRYPTO_CAMELLIA_X86_64 CRYPTO_CAST5 CRYPTO_CAST5_AVX_X86_64 CRYPTO_CAST6 CRYPTO_CAST6_AVX_X86_64 CRYPTO_CAST_COMMON CRYPTO_CHACHA20POLY1305 CRYPTO_CHACHA20_X86_64 CRYPTO_CRC32 CRYPTO_CRC32C_INTEL CRYPTO_CRC32_PCLMUL CRYPTO_CRC64_ROCKSOFT CRYPTO_CRCT10DIF CRYPTO_CRCT10DIF_PCLMUL CRYPTO_CRYPTD CRYPTO_CURVE25519 CRYPTO_CURVE25519_X86 CRYPTO_DEFLATE CRYPTO_DES CRYPTO_DES3_EDE_X86_64 CRYPTO_DEV_CCP CRYPTO_DEV_CCP_DD CRYPTO_DEV_PADLOCK CRYPTO_DEV_PADLOCK_AES CRYPTO_DEV_PADLOCK_SHA CRYPTO_DEV_QAT CRYPTO_DEV_QAT_C3XXX CRYPTO_DEV_QAT_C3XXXVF CRYPTO_DEV_QAT_C62X CRYPTO_DEV_QAT_C62XVF CRYPTO_DEV_QAT_DH895xCC CRYPTO_DEV_QAT_DH895xCCVF CRYPTO_DEV_VIRTIO CRYPTO_DH CRYPTO_DRBG_CTR CRYPTO_DRBG_HASH CRYPTO_ECDH CRYPTO_ECRDSA CRYPTO_ENGINE CRYPTO_ESSIV CRYPTO_FCRYPT CRYPTO_GHASH_CLMUL_NI_INTEL CRYPTO_HCTR2 CRYPTO_KDF800108_CTR CRYPTO_KEYWRAP CRYPTO_KHAZAD CRYPTO_KPP CRYPTO_LIB_ARC4 CRYPTO_LIB_CHACHA CRYPTO_LIB_CHACHA20POLY1305 CRYPTO_LIB_CURVE25519 CRYPTO_LIB_CURVE25519_GENERIC CRYPTO_LIB_POLY1305 CRYPTO_LIB_POLY1305_GENERIC CRYPTO_LRW CRYPTO_NHPOLY1305 CRYPTO_NHPOLY1305_AVX2 CRYPTO_NHPOLY1305_SSE2 CRYPTO_PCBC CRYPTO_PCRYPT CRYPTO_POLY1305 CRYPTO_POLY1305_X86_64 CRYPTO_POLYVAL CRYPTO_POLYVAL_CLMUL_NI CRYPTO_RMD160 CRYPTO_SEED CRYPTO_SERPENT CRYPTO_SERPENT_AVX2_X86_64 CRYPTO_SERPENT_AVX_X86_64 CRYPTO_SERPENT_SSE2_X86_64 CRYPTO_SHA1_SSSE3 CRYPTO_SHA256_SSSE3 CRYPTO_SHA512_SSSE3 CRYPTO_SIMD CRYPTO_SM3_AVX_X86_64 CRYPTO_SM4_AESNI_AVX2_X86_64 CRYPTO_SM4_AESNI_AVX_X86_64 CRYPTO_STREEBOG CRYPTO_TEA CRYPTO_TWOFISH CRYPTO_TWOFISH_AVX_X86_64 CRYPTO_TWOFISH_COMMON CRYPTO_TWOFISH_X86_64 CRYPTO_TWOFISH_X86_64_3WAY CRYPTO_USER CRYPTO_USER_API CRYPTO_USER_API_AEAD CRYPTO_USER_API_ENABLE_OBSOLETE CRYPTO_USER_API_HASH CRYPTO_USER_API_RNG CRYPTO_USER_API_SKCIPHER CRYPTO_VMAC CRYPTO_WP512 CRYPTO_XCTR CRYPTO_XXHASH CUSE CYPRESS_FIRMWARE DAMON DAMON_PADDR DAMON_RECLAIM DAMON_VADDR DAX DCA DCB DEFAULT_CODEL DEVICE_MIGRATION DEVICE_PRIVATE DEV_COREDUMP DEV_DAX DLN2_ADC DMABUF_HEAPS DMABUF_HEAPS_CMA DMABUF_HEAPS_SYSTEM DMABUF_MOVE_NOTIFY DMA_CMA DMA_ENGINE_RAID DMA_OPS DM_AUDIT DM_BIO_PRISON DM_BUFIO DM_CACHE DM_CACHE_SMQ DM_CLONE DM_CRYPT DM_FLAKEY DM_INTEGRITY DM_MULTIPATH DM_MULTIPATH_QL DM_MULTIPATH_ST DM_PERSISTENT_DATA DM_RAID DM_SNAPSHOT DM_THIN_PROVISIONING DM_UEVENT DM_VERITY DM_VERITY_FEC DM_WRITECACHE DM_ZONED DRAGONRISE_FF DRM DRM_AUX_BRIDGE DRM_BOCHS DRM_BRIDGE DRM_BUDDY DRM_CIRRUS_QEMU DRM_DEBUG_MM DRM_DISPLAY_DP_AUX_BUS DRM_DISPLAY_DP_HELPER DRM_DISPLAY_HDCP_HELPER DRM_DISPLAY_HDMI_HELPER DRM_DISPLAY_HELPER DRM_FBDEV_EMULATION 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 ENCRYPTED_KEYS FSCACHE FUSE_FS GPIOLIB HAMRADIO HID_DRAGONRISE IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ ISDN ISDN_CAPI LIBNVDIMM MAC80211 MAC80211_DEBUGFS MAC80211_LEDS MEDIA_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MMC MTD NET_CLS_U32 NET_SCH_DEFAULT PARTITION_ADVANCED RFKILL SERIAL_DEV_BUS TLS TLS_DEVICE TRANSPARENT_HUGEPAGE TRUSTED_KEYS USB_GADGET USB_PHY VLAN_8021Q WANT_COMPAT_NETLINK_MESSAGES WEXT_CORE WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ATH X86_X32_ABI ZONE_DEVICE] disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed picked [v6.10 v6.9 v6.8 v6.6 v6.4 v6.2 v6.0 v5.18 v5.15 v5.12 v5.9 v5.6 v5.3 v5.0 v4.19] out of 33 release tags testing release v6.10 testing commit 0c3836482481200ead7b416ca80c68a29cfdaabd gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5174991d11d917b90f0a14f24f0e352dc69185eadc6dfba66cb899c8b685ffec all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] testing release v6.9 testing commit a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: bab7d4243274a79cbb59ff6a990610107b6be5d389808cfbaa749c64addae1db all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] testing release v6.8 testing commit e8f897f4afef0031fe618a8e94127a0934896aba gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 917c9683fc159ef9313282c8937cf216e0dd22ab1367c71309061ca978a120e8 all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] testing release v6.6 testing commit ffc253263a1375a65fa6c9f62a893e9767fbebfa gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e80b9825123528328957de9faa7601ac3d4f3c7b69de95cddfd281ba4e3ba02e all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] testing release v6.4 testing commit 6995e2de6891c724bfeb2db33d7b87775f913ad1 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: bea24d424137b5bb12c856764e4f241c6c3380462f25672f22c059bfe743c0a0 all runs: crashed: KASAN: slab-use-after-free Read in set_powered_sync representative crash: KASAN: slab-use-after-free Read in set_powered_sync, types: [KASAN] testing release v6.2 testing commit c9c3395d5e3dcc6daee66c6908354d47bf98cb0c gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8c454ab6824f99bb957956931d3e9cab17ab9981504e49b28fe55b89a202befb all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] testing release v6.0 testing commit 4fe89d07dcc2804c8b562f6c7896a45643d34b2f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: aed01d8360084f9f86d511a6b6ea17a044cce018669cd032f238a7a064353c8b all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] testing release v5.18 testing commit 4b0986a3613c92f4ec1bdc7f60ec66fea135991f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d242a1184a388b81300a9a1ec47496a47ff4d523a0cebe8fa99e7c2641eff6a7 all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] testing release v5.15 testing commit 8bb7eca972ad531c9b149c0a51ab43a417385813 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ae7a9af0ff48e6eac8e382e4e3e0f7eb21ec5af979f7d323a1145d613fb01d32 all runs: OK false negative chance: 0.000 # git bisect start 4b0986a3613c92f4ec1bdc7f60ec66fea135991f 8bb7eca972ad531c9b149c0a51ab43a417385813 Bisecting: 22908 revisions left to test after this (roughly 15 steps) [6020c204be997e3f5129839ff9c801800fb4336e] Merge tag 'folio-5.17' of git://git.infradead.org/users/willy/pagecache testing commit 6020c204be997e3f5129839ff9c801800fb4336e gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 04ce22cf48dc67ad46a3bd5ad83b50182113617d5bf2c5e7d6e3f2f66cbb3c76 all runs: OK false negative chance: 0.000 # git bisect good 6020c204be997e3f5129839ff9c801800fb4336e Bisecting: 11439 revisions left to test after this (roughly 14 steps) [7403e6d8263937dea206dd201fed1ceed190ca18] Merge tag 'vfio-v5.18-rc1' of https://github.com/awilliam/linux-vfio testing commit 7403e6d8263937dea206dd201fed1ceed190ca18 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ad68166e64756258e21d49f14e5ef7f4d946780df765ba1dc907548fb5eb6be6 all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad 7403e6d8263937dea206dd201fed1ceed190ca18 Bisecting: 5735 revisions left to test after this (roughly 13 steps) [1c2a33d0ac6961d36cd653638c7841b179969906] Merge tag 'acpi-5.17-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm testing commit 1c2a33d0ac6961d36cd653638c7841b179969906 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 86ad0d85b846cc6570a5b26e4bd852bd1e26c36b38ac1d4cfd63b1a5057b0550 all runs: OK false negative chance: 0.000 # git bisect good 1c2a33d0ac6961d36cd653638c7841b179969906 Bisecting: 2761 revisions left to test after this (roughly 12 steps) [3bf03b9a0839c9fb06927ae53ebd0f960b19d408] Merge branch 'akpm' (patches from Andrew) testing commit 3bf03b9a0839c9fb06927ae53ebd0f960b19d408 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ef4ebaf4c9f917f21db516d662d226ab187112420700c7c73d5b3accf42098c2 all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad 3bf03b9a0839c9fb06927ae53ebd0f960b19d408 Bisecting: 1475 revisions left to test after this (roughly 11 steps) [242ba6656d604aa8dc87451fc08143cb28d5a587] Merge tag 'acpi-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm testing commit 242ba6656d604aa8dc87451fc08143cb28d5a587 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5b2f225610bc4dbdd357b9eb5faf6b09e8163b14746ed790da9f79a2d10787a5 all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad 242ba6656d604aa8dc87451fc08143cb28d5a587 Bisecting: 748 revisions left to test after this (roughly 10 steps) [b1a384d2cbccb1eb3f84765020d25e2c1929706e] ARM: fix build warning in proc-v7-bugs.c testing commit b1a384d2cbccb1eb3f84765020d25e2c1929706e gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 66c2c0735e40fb798525c96640375f0f8d9c781551fa34abe1b6e6ea0723a9db all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad b1a384d2cbccb1eb3f84765020d25e2c1929706e Bisecting: 373 revisions left to test after this (roughly 9 steps) [201b5c016f1655ead2ecc7e7e270841782cbbd0b] Merge tag 'efi-urgent-for-v5.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi testing commit 201b5c016f1655ead2ecc7e7e270841782cbbd0b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3a08333ff29ed83819e08f4880a8c065aaaab1b80a8828b20e2e5c74fd9cdecd all runs: OK false negative chance: 0.000 # git bisect good 201b5c016f1655ead2ecc7e7e270841782cbbd0b Bisecting: 188 revisions left to test after this (roughly 8 steps) [0b7344a658e66a6835ad96dbc5dd35f1e876078a] Merge tag 'pinctrl-v5.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl testing commit 0b7344a658e66a6835ad96dbc5dd35f1e876078a gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 30e6c066f51ea780b1aef54b9714c7fcbd2bb5348e47884a5265a6ef2d94f0b8 all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad 0b7344a658e66a6835ad96dbc5dd35f1e876078a Bisecting: 92 revisions left to test after this (roughly 7 steps) [60ce37b03917e593d8e5d8bcc7ec820773daf81d] bpf, sockmap: Do not ignore orig_len parameter testing commit 60ce37b03917e593d8e5d8bcc7ec820773daf81d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0306d00a264d390366048924c1eca4a25452393eb54ee60c34fdc9a94122012c all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad 60ce37b03917e593d8e5d8bcc7ec820773daf81d Bisecting: 43 revisions left to test after this (roughly 6 steps) [519ca6fa960587d02904a9f8f79d587ac874fb03] Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/net-queue testing commit 519ca6fa960587d02904a9f8f79d587ac874fb03 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 52eec5135c181f4a8dc86de47eff85996a7ddec29b42be86ecced1be7eb9e9b5 all runs: OK false negative chance: 0.000 # git bisect good 519ca6fa960587d02904a9f8f79d587ac874fb03 Bisecting: 23 revisions left to test after this (roughly 5 steps) [b8d06ce712e37c6a6e74bf1624a0f4a412cd6508] Merge tag 'wireless-for-net-2022-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless testing commit b8d06ce712e37c6a6e74bf1624a0f4a412cd6508 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c18e112d113a98fc5db8f36801b43394b52e51b07bccff5710d4272d8c1c887e all runs: OK false negative chance: 0.000 # git bisect good b8d06ce712e37c6a6e74bf1624a0f4a412cd6508 Bisecting: 11 revisions left to test after this (roughly 4 steps) [0b0e2ff10356e7e2ffd66ecdd6eee69a2f03449b] net: dsa: restore error path of dsa_tree_change_tag_proto testing commit 0b0e2ff10356e7e2ffd66ecdd6eee69a2f03449b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d9749553aed0197f86f8feffc6ee9a62550938f8c094bcb5f992ec969f1ce2f9 all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad 0b0e2ff10356e7e2ffd66ecdd6eee69a2f03449b Bisecting: 5 revisions left to test after this (roughly 3 steps) [c3873070247d9e3c7a6b0cf9bf9b45e8018427b1] netfilter: nf_queue: fix possible use-after-free testing commit c3873070247d9e3c7a6b0cf9bf9b45e8018427b1 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 523732a1f6546d925131f28cc1fb08d23346c426849d5c972d9a9cc8cdca12b9 all runs: OK false negative chance: 0.000 # git bisect good c3873070247d9e3c7a6b0cf9bf9b45e8018427b1 Bisecting: 2 revisions left to test after this (roughly 2 steps) [4761df52f1549cc8c5ffcad0b2095fffe2c5435d] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf testing commit 4761df52f1549cc8c5ffcad0b2095fffe2c5435d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 960aca009ad6019e3cedc8e50c3f74a89b04d45eec1d1ae525c65085ae115656 all runs: OK false negative chance: 0.000 # git bisect good 4761df52f1549cc8c5ffcad0b2095fffe2c5435d Bisecting: 0 revisions left to test after this (roughly 1 step) [2e77551c61286bac56ebf337b1ac2dd419952c8d] Merge tag 'for-net-2022-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth testing commit 2e77551c61286bac56ebf337b1ac2dd419952c8d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a62fd7dd089f6457bec18638a46204a47c8c8f7324163990d0b830ce04839afb all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad 2e77551c61286bac56ebf337b1ac2dd419952c8d Bisecting: 0 revisions left to test after this (roughly 0 steps) [275f3f64870245b06188f24bdf917e55a813d294] Bluetooth: Fix not checking MGMT cmd pending queue testing commit 275f3f64870245b06188f24bdf917e55a813d294 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e4559cd3ffe81a1fcb8a1f82c06c92be574adf96ba833cd1e7090ad5db276eb3 all runs: crashed: KASAN: use-after-free Read in set_powered_sync representative crash: KASAN: use-after-free Read in set_powered_sync, types: [KASAN] # git bisect bad 275f3f64870245b06188f24bdf917e55a813d294 275f3f64870245b06188f24bdf917e55a813d294 is the first bad commit commit 275f3f64870245b06188f24bdf917e55a813d294 Author: Brian Gix Date: Tue Mar 1 14:34:57 2022 -0800 Bluetooth: Fix not checking MGMT cmd pending queue A number of places in the MGMT handlers we examine the command queue for other commands (in progress but not yet complete) that will interact with the process being performed. However, not all commands go into the queue if one of: 1. There is no negative side effect of consecutive or redundent commands 2. The command is entirely perform "inline". This change examines each "pending command" check, and if it is not needed, deletes the check. Of the remaining pending command checks, we make sure that the command is in the pending queue by using the mgmt_pending_add/mgmt_pending_remove pair rather than the mgmt_pending_new/mgmt_pending_free pair. Link: https://lore.kernel.org/linux-bluetooth/f648f2e11bb3c2974c32e605a85ac3a9fac944f1.camel@redhat.com/T/ Tested-by: Maxim Levitsky Signed-off-by: Brian Gix Signed-off-by: Luiz Augusto von Dentz net/bluetooth/mgmt.c | 99 +++++++++++++++++++++++++++++++++------------------- 1 file changed, 63 insertions(+), 36 deletions(-) accumulated error probability: 0.00 parent commit caef14b7530c065fb85d54492768fa48fdb5093e wasn't tested testing commit caef14b7530c065fb85d54492768fa48fdb5093e gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3dc47e454feca85bfd6e593972fd73ce3e23294526edb0d2ed4e09e404dfe8ed culprit signature: e4559cd3ffe81a1fcb8a1f82c06c92be574adf96ba833cd1e7090ad5db276eb3 parent signature: 3dc47e454feca85bfd6e593972fd73ce3e23294526edb0d2ed4e09e404dfe8ed revisions tested: 32, total time: 7h25m43.325201956s (build: 4h0m33.452240157s, test: 3h7m50.066205448s) first bad commit: 275f3f64870245b06188f24bdf917e55a813d294 Bluetooth: Fix not checking MGMT cmd pending queue recipients (to): ["brian.gix@intel.com" "luiz.von.dentz@intel.com" "mlevitsk@redhat.com"] recipients (cc): [] crash: KASAN: use-after-free Read in set_powered_sync ================================================================== BUG: KASAN: use-after-free in set_powered_sync+0x2f/0x90 net/bluetooth/mgmt.c:1257 Read of size 8 at addr ffff88810b3d6818 by task kworker/u5:1/1434 CPU: 1 PID: 1434 Comm: kworker/u5:1 Not tainted 5.17.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: hci0 hci_cmd_sync_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xf4/0x251 lib/dump_stack.c:106 print_address_description+0x62/0x370 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:459 set_powered_sync+0x2f/0x90 net/bluetooth/mgmt.c:1257 hci_cmd_sync_work+0x19c/0x200 net/bluetooth/hci_sync.c:307 process_one_work+0x763/0xd30 kernel/workqueue.c:2307 worker_thread+0x86e/0xeb0 kernel/workqueue.c:2454 kthread+0x210/0x260 kernel/kthread.c:377 ret_from_fork+0x22/0x30 Allocated by task 2753: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:270 [inline] kmem_cache_alloc_trace+0x158/0x2b0 mm/slub.c:3257 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] mgmt_pending_new+0x5d/0x200 net/bluetooth/mgmt_util.c:269 mgmt_pending_add+0x12/0xe0 net/bluetooth/mgmt_util.c:296 set_powered+0x260/0x3f0 net/bluetooth/mgmt.c:1290 hci_mgmt_cmd+0x820/0xd40 net/bluetooth/hci_sock.c:1611 hci_sock_sendmsg+0x707/0xf60 net/bluetooth/hci_sock.c:1731 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] sock_write_iter+0x47d/0x490 net/socket.c:1061 call_write_iter include/linux/fs.h:2074 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xb05/0xf10 fs/read_write.c:590 ksys_write+0x165/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 2752: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x11f/0x170 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x12c/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xdc/0x230 mm/slub.c:4562 settings_rsp+0x284/0x340 net/bluetooth/mgmt.c:1331 mgmt_pending_foreach+0x6d/0xd0 net/bluetooth/mgmt_util.c:259 __mgmt_power_off+0x106/0x3c0 net/bluetooth/mgmt.c:8887 hci_dev_close_sync+0x345/0xd20 net/bluetooth/hci_sync.c:4107 hci_dev_do_close net/bluetooth/hci_core.c:553 [inline] hci_dev_close+0x9d/0x150 net/bluetooth/hci_core.c:577 sock_do_ioctl+0x106/0x390 net/socket.c:1122 sock_ioctl+0x47b/0x5f0 net/socket.c:1239 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xaa/0xf0 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3026 [inline] call_rcu+0x19c/0x8d0 kernel/rcu/tree.c:3106 nf_unregister_net_hooks+0x35/0xd0 net/netfilter/core.c:606 ops_pre_exit_list net/core/net_namespace.c:158 [inline] cleanup_net+0x504/0xa90 net/core/net_namespace.c:585 process_one_work+0x763/0xd30 kernel/workqueue.c:2307 worker_thread+0x86e/0xeb0 kernel/workqueue.c:2454 kthread+0x210/0x260 kernel/kthread.c:377 ret_from_fork+0x22/0x30 The buggy address belongs to the object at ffff88810b3d6800 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 24 bytes inside of 96-byte region [ffff88810b3d6800, ffff88810b3d6860) The buggy address belongs to the page: page:ffffea00042cf580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b3d6 flags: 0x100000000000200(slab|node=0|zone=2) raw: 0100000000000200 ffffea0005dbe880 dead000000000003 ffff888100041780 raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 3575937415, free_ts 3574174491 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ef/0x210 mm/page_alloc.c:2427 prep_new_page+0x28/0x230 mm/page_alloc.c:2434 get_page_from_freelist+0x3a4a/0x3bf0 mm/page_alloc.c:4165 __alloc_pages+0x277/0x700 mm/page_alloc.c:5389 alloc_page_interleave+0xf/0x130 mm/mempolicy.c:2116 alloc_slab_page+0x39/0x90 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x70/0x2a0 mm/slub.c:2004 ___slab_alloc+0x5a2/0xab0 mm/slub.c:3018 __slab_alloc mm/slub.c:3105 [inline] slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x1af/0x2b0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] acpi_button_add+0x7c/0x880 drivers/acpi/button.c:493 acpi_device_probe+0xa4/0x290 drivers/acpi/bus.c:994 really_probe+0x22a/0xa80 drivers/base/dd.c:596 __driver_probe_device+0x1e1/0x350 drivers/base/dd.c:752 driver_probe_device+0x4b/0x3a0 drivers/base/dd.c:782 __driver_attach+0x282/0x580 drivers/base/dd.c:1141 bus_for_each_dev+0x156/0x1b0 drivers/base/bus.c:301 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare mm/page_alloc.c:1404 [inline] free_unref_page_prepare+0xb4a/0xc10 mm/page_alloc.c:3325 free_unref_page+0x95/0x280 mm/page_alloc.c:3404 __vunmap+0x331/0x7b0 mm/vmalloc.c:2635 free_work+0x3d/0x70 mm/vmalloc.c:97 process_one_work+0x763/0xd30 kernel/workqueue.c:2307 worker_thread+0x86e/0xeb0 kernel/workqueue.c:2454 kthread+0x210/0x260 kernel/kthread.c:377 ret_from_fork+0x22/0x30 Memory state around the buggy address: ffff88810b3d6700: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff88810b3d6780: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff88810b3d6800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88810b3d6880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88810b3d6900: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ==================================================================