ci starts bisection 2024-09-20 00:16:23.231522542 +0000 UTC m=+34531.464863196 bisecting cause commit starting from a430d95c5efa2b545d26a094eb5f624e36732af0 building syzkaller on c673ca06b23cea94091ab496ef62c3513e434585 ensuring issue is reproducible on original commit a430d95c5efa2b545d26a094eb5f624e36732af0 testing commit a430d95c5efa2b545d26a094eb5f624e36732af0 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3f908ea2ca30dfa7fb5aa26a903995bc128309ab031632aee15163a5f6050673 all runs: crashed: WARNING: refcount bug in sk_skb_reason_drop representative crash: WARNING: refcount bug in sk_skb_reason_drop, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit a430d95c5efa2b545d26a094eb5f624e36732af0 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 50c2383777dd7a9dd77ef3847aade36f9503bf059c76b603cf7e90385856e9e0 all runs: crashed: WARNING: refcount bug in sk_skb_reason_drop representative crash: WARNING: refcount bug in sk_skb_reason_drop, types: [WARNING] the bug reproduces without the instrumentation disabling configs for [HANG LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP], they are not needed kconfig minimization: base=4047 full=8155 leaves diff=2104 split chunks (needed=false): <2104> split chunk #0 of len 2104 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 a430d95c5efa2b545d26a094eb5f624e36732af0 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 1c3c59063e341179d93257cdcaaaddaf1d6d3115a0d65339d2fa8a295ea0a519 all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit a430d95c5efa2b545d26a094eb5f624e36732af0 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6fd48313e95e0a99f778e7db73ec6183fa1172868bd8b5e61686c4ec6e6be04b all runs: crashed: WARNING: refcount bug in sk_skb_reason_drop representative crash: WARNING: refcount bug in sk_skb_reason_drop, types: [WARNING] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN KASAN], they are not needed testing commit a430d95c5efa2b545d26a094eb5f624e36732af0 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ab9942ab04d7903ddd5fe0f3cfd6cc3045a53f4545c73d410232df368220bf5b all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit a430d95c5efa2b545d26a094eb5f624e36732af0 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6c97c002979b3d9c660f6f7173da1aafab0ffb76a9841d29fa37c7be63d6ee66 all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, 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 a430d95c5efa2b545d26a094eb5f624e36732af0 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b0c8af39a9c66ca5fdf537de8c169d60f913d3ce8bda8b155917fd22ecd90940 all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] the chunk can be dropped minimized to 421 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_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 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 DRM_VGEM ENCRYPTED_KEYS FSCACHE FUSE_FS GPIOLIB HAMRADIO HID_DRAGONRISE IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ 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 [UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed picked [v6.11 v6.10 v6.9 v6.7 v6.5 v6.3 v6.1 v5.19 v5.16 v5.13 v5.10 v5.7 v5.4 v5.1 v4.19] out of 34 release tags testing release v6.11 testing commit 98f7e32f20d28ec452afb208f9cffc08448a2652 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 74117f21405c75d7cbcc53536ed3972811fa8b63bf1677bf0819c535cf6b97d5 all runs: OK false negative chance: 0.000 # git bisect start a430d95c5efa2b545d26a094eb5f624e36732af0 98f7e32f20d28ec452afb208f9cffc08448a2652 Bisecting: 1286 revisions left to test after this (roughly 10 steps) [9f6b619edf2e85746f261b42ae8f818a59d126f7] net: support non paged skb frags testing commit 9f6b619edf2e85746f261b42ae8f818a59d126f7 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f5fd9db699cddff858367d9335f90db0ae9b3a6a2a6db4e42d5564d08abc3020 all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad 9f6b619edf2e85746f261b42ae8f818a59d126f7 Bisecting: 643 revisions left to test after this (roughly 9 steps) [1dce520abd461efcaf4a5a942d8eb833eef52d0b] net: phy: Use for_each_available_child_of_node_scoped() testing commit 1dce520abd461efcaf4a5a942d8eb833eef52d0b gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9ed05e22ebc983122ee5d86ea09e7efa1be1838bfd7155c000444ed1be5f18ea all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad 1dce520abd461efcaf4a5a942d8eb833eef52d0b Bisecting: 321 revisions left to test after this (roughly 8 steps) [8ef34bea8cad381e0b5c90f9e4e539f48e8c2d7f] net: ag71xx: use devm for of_mdiobus_register testing commit 8ef34bea8cad381e0b5c90f9e4e539f48e8c2d7f gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 28b322142c49ad15c7329d7c91eb1c6da4754f7d62a221178fe56cc38e0de975 all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad 8ef34bea8cad381e0b5c90f9e4e539f48e8c2d7f Bisecting: 160 revisions left to test after this (roughly 7 steps) [eb3ab13d997a2f12ec9d557b6ae2aea4e28e2bc3] net: ti: icssg_prueth: populate netdev of_node testing commit eb3ab13d997a2f12ec9d557b6ae2aea4e28e2bc3 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d6bfec18962a4df3250cad0aa16c02dd8e661209394bf3d5b1d2281557604c7e all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad eb3ab13d997a2f12ec9d557b6ae2aea4e28e2bc3 Bisecting: 79 revisions left to test after this (roughly 6 steps) [b5381a5540cbb7c18642a3280cb3906160bd6546] ibmveth: Recycle buffers during replenish phase testing commit b5381a5540cbb7c18642a3280cb3906160bd6546 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f78d7a35b7511609bde7f8bdd263d74c30f9a77ed9f6c4207d575994d2214606 all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad b5381a5540cbb7c18642a3280cb3906160bd6546 Bisecting: 39 revisions left to test after this (roughly 5 steps) [2d671dc6f069f46214d96e934e14f5952d76d92f] net: xgbe: Convert tasklet API to new bottom half workqueue mechanism testing commit 2d671dc6f069f46214d96e934e14f5952d76d92f gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 002201c12975cec2aa14b073f451e6db0061c5b407f6dc122224e4942c5038a2 all runs: OK false negative chance: 0.000 # git bisect good 2d671dc6f069f46214d96e934e14f5952d76d92f Bisecting: 19 revisions left to test after this (roughly 4 steps) [f83828a0522fc57b244629844fc413e38cde95f3] net: axienet: remove unnecessary ftrace-like logging testing commit f83828a0522fc57b244629844fc413e38cde95f3 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 580f53fe45667b47bf77db8619e0b11ad9e124769880f164fd0914a04f080727 all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad f83828a0522fc57b244629844fc413e38cde95f3 Bisecting: 9 revisions left to test after this (roughly 3 steps) [5fcf0801ef5c8adb785520f16b4a1faa8c4ac147] net: mctp: Consistent peer address handling in ioctl tag allocation testing commit 5fcf0801ef5c8adb785520f16b4a1faa8c4ac147 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7ba3741beb1e085371095d671d2c9597622234c869dacdbba6311b3313a9af28 all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad 5fcf0801ef5c8adb785520f16b4a1faa8c4ac147 Bisecting: 4 revisions left to test after this (roughly 2 steps) [501c3005f0311a7810cc7e56546930638ae6b26f] net/mlx5: Reclaim max 50K pages at once testing commit 501c3005f0311a7810cc7e56546930638ae6b26f gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: edd1d0c2b0e16b4c9b9cb5d31f63856423556a8a8df4804ab421fad4090a4ffe all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad 501c3005f0311a7810cc7e56546930638ae6b26f Bisecting: 2 revisions left to test after this (roughly 1 step) [c5092ba3155e0696e922fc9f1c2909f48fde2102] net: macb: Convert tasklet API to new bottom half workqueue mechanism testing commit c5092ba3155e0696e922fc9f1c2909f48fde2102 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a97c9d0d1787e740ec8441523d2997ca2527675743e9fbe1c1db05e86f7926bd all runs: OK false negative chance: 0.000 # git bisect good c5092ba3155e0696e922fc9f1c2909f48fde2102 Bisecting: 0 revisions left to test after this (roughly 1 step) [c9c0ee5f20c593faf289fa8850c3ed84031dd12a] net: skbuff: Skip early return in skb_unref when debugging testing commit c9c0ee5f20c593faf289fa8850c3ed84031dd12a gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8ada3ed6c596df54781e0bce143ce8bae7a7811d6dac87a6381bb2ce3aeedc26 all runs: crashed: WARNING: refcount bug in j1939_session_destroy representative crash: WARNING: refcount bug in j1939_session_destroy, types: [WARNING] # git bisect bad c9c0ee5f20c593faf289fa8850c3ed84031dd12a Bisecting: 0 revisions left to test after this (roughly 0 steps) [8e0c0ec9b7dc2aec84f141c26c501e24906ff765] Merge branch 'ethernet-convert-from-tasklet-to-bh-workqueue' testing commit 8e0c0ec9b7dc2aec84f141c26c501e24906ff765 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f56db04a6f8f316e9edc0c6b7791603071f1fd8d4fbfa83ed125576610d2ad52 all runs: OK false negative chance: 0.000 # git bisect good 8e0c0ec9b7dc2aec84f141c26c501e24906ff765 c9c0ee5f20c593faf289fa8850c3ed84031dd12a is the first bad commit commit c9c0ee5f20c593faf289fa8850c3ed84031dd12a Author: Breno Leitao Date: Mon Jul 29 03:47:40 2024 -0700 net: skbuff: Skip early return in skb_unref when debugging This patch modifies the skb_unref function to skip the early return optimization when CONFIG_DEBUG_NET is enabled. The change ensures that the reference count decrement always occurs in debug builds, allowing for more thorough checking of SKB reference counting. Previously, when the SKB's reference count was 1 and CONFIG_DEBUG_NET was not set, the function would return early after a memory barrier (smp_rmb()) without decrementing the reference count. This optimization assumes it's safe to proceed with freeing the SKB without the overhead of an atomic decrement from 1 to 0. With this change: - In non-debug builds (CONFIG_DEBUG_NET not set), behavior remains unchanged, preserving the performance optimization. - In debug builds (CONFIG_DEBUG_NET set), the reference count is always decremented, even when it's 1, allowing for consistent behavior and potentially catching subtle SKB management bugs. This modification enhances debugging capabilities for networking code without impacting performance in production kernels. It helps kernel developers identify and diagnose issues related to SKB management and reference counting in the network stack. Cc: Chris Mason Suggested-by: Jakub Kicinski Signed-off-by: Breno Leitao Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20240729104741.370327-1-leitao@debian.org Signed-off-by: Paolo Abeni include/linux/skbuff.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) accumulated error probability: 0.00 culprit signature: 8ada3ed6c596df54781e0bce143ce8bae7a7811d6dac87a6381bb2ce3aeedc26 parent signature: f56db04a6f8f316e9edc0c6b7791603071f1fd8d4fbfa83ed125576610d2ad52 revisions tested: 20, total time: 8h34m38.967142514s (build: 6h6m24.479901393s, test: 2h13m25.434481185s) first bad commit: c9c0ee5f20c593faf289fa8850c3ed84031dd12a net: skbuff: Skip early return in skb_unref when debugging recipients (to): ["edumazet@google.com" "leitao@debian.org" "pabeni@redhat.com"] recipients (cc): [] crash: WARNING: refcount bug in j1939_session_destroy ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 0 PID: 3324 at lib/refcount.c:28 refcount_warn_saturate+0xd0/0x130 lib/refcount.c:28 Modules linked in: CPU: 0 UID: 0 PID: 3324 Comm: syz.0.15 Not tainted 6.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:refcount_warn_saturate+0xd0/0x130 lib/refcount.c:28 Code: 0b 90 90 e9 0d b3 3b 01 80 3d 9b 84 69 02 00 0f 85 75 ff ff ff c6 05 8e 84 69 02 01 90 48 c7 c7 38 b4 9e 83 e8 31 64 5e ff 90 <0f> 0b 90 90 e9 e2 b2 3b 01 80 3d 6e 84 69 02 00 0f 85 4a ff ff ff RSP: 0018:ffffc90002debcc0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff888102fb3400 RCX: 0000000000000000 RDX: 0000000000000203 RSI: 00000000ffffdfff RDI: 00000000ffffffff RBP: ffff888104b11600 R08: 0000000000000000 R09: 0000000000000003 R10: ffffc90002debb60 R11: ffffffff83f84dc8 R12: ffff888104b11668 R13: 00000000ffffffff R14: ffff888103ba85e0 R15: ffff888103ba8608 FS: 00007fce7124a6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f55ded9a440 CR3: 0000000100f54000 CR4: 0000000000350ef0 Call Trace: kfree_skb_reason include/linux/skbuff.h:1260 [inline] kfree_skb include/linux/skbuff.h:1269 [inline] j1939_session_destroy+0x74/0x190 net/can/j1939/transport.c:282 j1939_sk_queue_drop_all+0x7f/0xd0 net/can/j1939/socket.c:144 j1939_sk_release+0x22e/0x240 net/can/j1939/socket.c:642 __sock_release+0x38/0xc0 net/socket.c:659 sock_close+0x13/0x20 net/socket.c:1421 __fput+0xef/0x2c0 fs/file_table.c:422 task_work_run+0x57/0x80 kernel/task_work.c:222 get_signal+0x88/0x8e0 kernel/signal.c:2689 arch_do_signal_or_restart+0x39/0x260 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xdb/0x1a0 kernel/entry/common.c:218 do_syscall_64+0xc1/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fce7037def9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fce7124a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 00000000000155a9 RBX: 00007fce70535f80 RCX: 00007fce7037def9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003 RBP: 00007fce703f0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fce70535f80 R15: 00007fff9ce1e0a8