ci starts bisection 2026-01-04 23:11:14.210655579 +0000 UTC m=+3409863.736141698 bisecting fixing commit since 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 building syzkaller on 67c375600e44473aafff4ce6ff7abb90e4f4fff4 ensuring issue is reproducible on original commit 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 testing commit 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 46aabba47eb88ec375f8a4f58bdb13d188abf38da7dc819a9d755073fc7eba38 all runs: crashed: KASAN: slab-use-after-free Read in driver_remove_file representative crash: KASAN: slab-use-after-free Read in driver_remove_file, types: [KASAN-USE-AFTER-FREE-READ] check whether we can drop unnecessary instrumentation disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e93aefda5ed8f9614cca9c28141094bdceca2afd581b78069279e255ac440f10 all runs: crashed: KASAN: slab-use-after-free Read in driver_remove_file representative crash: KASAN: slab-use-after-free Read in driver_remove_file, types: [KASAN-USE-AFTER-FREE-READ] the bug reproduces without the instrumentation disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed kconfig minimization: base=4109 full=8499 leaves diff=2189 split chunks (needed=false): <2189> split chunk #0 of len 2189 into 5 parts testing without sub-chunk 1/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7fad4be4f3c52f0e1d31ef9b2c540481b500a0a9b35fcb59b343554d743e22f9 all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: deeb810ec9abaa70672694fb532b0e65fa492e59d539e5ae0a0dc226f0d27ad0 all runs: crashed: KASAN: slab-use-after-free Read in driver_remove_file representative crash: KASAN: slab-use-after-free Read in driver_remove_file, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 1f57a995efc58b47e7282b164afc4f6421b40a3e2463d58d490068c89b295275 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 031e38ec4a8c613d5a9fc1f2cb7efea27058a4e7730422f734c6fc468804d0fd all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [bug_or_warning locking atomic_sleep hang memleak ubsan], they are not needed testing commit 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 535c3a371cc286b5e6c161cb1abac8f6b6a54151aa44f2863b726ae74d68c492 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped minimized to 438 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 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_THP_MIGRATION ARCH_HAS_USER_SHADOW_STACK ARCH_SUPPORTS_CFI_CLANG ARCH_SUPPORTS_HUGE_PFNMAP ARCH_SUPPORTS_PMD_PFNMAP ARCH_SUPPORTS_PUD_PFNMAP ARCH_WANT_PMD_MKWRITE ASM_MODVERSIONS ASUS_TF103C_DOCK ASYNC_CORE ASYNC_MEMCPY ASYNC_PQ ASYNC_RAID6_RECOV ASYNC_TX_DMA ASYNC_XOR AS_AVX512 AS_GFNI AS_VAES AS_VPCLMULQDQ 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_ICQ BLK_INLINE_ENCRYPTION BLK_INLINE_ENCRYPTION_FALLBACK BLK_WBT BLK_WBT_MQ BONDING BOOT_VESA_SUPPORT BPF_EVENTS BPF_JIT BPF_JIT_DEFAULT_ON BPF_LSM BPF_PRELOAD BPF_PRELOAD_UMD BPF_SYSCALL BPQETHER BRIDGE BRIDGE_CFM BRIDGE_EBT_802_3 BRIDGE_EBT_AMONG BRIDGE_EBT_ARP BRIDGE_EBT_ARPREPLY 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_VLAN BRIDGE_IGMP_SNOOPING BRIDGE_MRP BRIDGE_NF_EBTABLES 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 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_8254 COMEDI_8255 COMEDI_8255_PCI COMEDI_8255_SA COMEDI_ADL_PCI9118 COMEDI_ADQ12B COMEDI_AIO_AIO12_8 COMEDI_AIO_IIRO_16 COMEDI_AMPLC_DIO200 COMEDI_AMPLC_DIO200_ISA COMEDI_AMPLC_PC236 COMEDI_AMPLC_PC236_ISA COMEDI_AMPLC_PC263_ISA COMEDI_BOND COMEDI_C6XDIGIO COMEDI_DAC02 COMEDI_DAS08 COMEDI_DAS08_ISA COMEDI_DAS16M1 COMEDI_DAS1800 COMEDI_DAS6402 COMEDI_DAS800 COMEDI_DMM32AT COMEDI_DT2801 COMEDI_DT2811 COMEDI_DT2814 COMEDI_DT2815 COMEDI_DT2817 COMEDI_DT282X COMEDI_DT9812 COMEDI_FL512 COMEDI_ISADMA COMEDI_ISA_DRIVERS COMEDI_KCOMEDILIB COMEDI_MISC_DRIVERS COMEDI_MPC624 COMEDI_MULTIQ3 COMEDI_NI_ATMIO16D COMEDI_NI_AT_A2150 COMEDI_NI_AT_AO COMEDI_NI_DAQ_700_CS COMEDI_NI_LABPC COMEDI_NI_LABPC_CS COMEDI_NI_LABPC_ISA COMEDI_NI_LABPC_ISADMA COMEDI_NI_LABPC_PCI COMEDI_NI_USB6501 COMEDI_PARPORT COMEDI_PCI_DRIVERS COMEDI_PCL711 COMEDI_PCL724 COMEDI_PCL726 COMEDI_PCL730 COMEDI_PCL812 COMEDI_PCL816 COMEDI_PCL818 COMEDI_PCM3724 COMEDI_PCMAD COMEDI_PCMCIA_DRIVERS COMEDI_PCMDA12 COMEDI_PCMMIO COMEDI_PCMUIO COMEDI_RTI800 COMEDI_RTI802 COMEDI_S526 COMEDI_TEST COMEDI_USBDUX COMEDI_USBDUXFAST COMEDI_USBDUXSIGMA COMEDI_USB_DRIVERS COMEDI_VMK80XX COMPAT_NETLINK_MESSAGES COUNTER CRAMFS CRAMFS_BLOCKDEV CRAMFS_MTD CRC64 CRC64_ARCH CRC8 CRC_CCITT CRC_ITU_T CRC_T10DIF CRC_T10DIF_ARCH CRYPTO_842 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_CHACHA20 CRYPTO_CHACHA20POLY1305 CRYPTO_CHACHA20_X86_64 CRYPTO_CRC32C CRYPTO_CRYPTD CRYPTO_CTS 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_HKDF CRYPTO_KDF800108_CTR CRYPTO_KHAZAD CRYPTO_KPP CRYPTO_KRB5 CRYPTO_KRB5ENC CRYPTO_LIB_ARC4 CRYPTO_LIB_BLAKE2S_GENERIC CRYPTO_LIB_CHACHA CRYPTO_LIB_CHACHA20POLY1305 CRYPTO_LIB_CHACHA_GENERIC CRYPTO_LIB_CURVE25519 CRYPTO_LIB_CURVE25519_GENERIC CRYPTO_LIB_CURVE25519_INTERNAL CRYPTO_LIB_DES CRYPTO_LIB_POLY1305 CRYPTO_LIB_POLY1305_GENERIC CRYPTO_LIB_SM3 CRYPTO_LRW CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_MICHAEL_MIC CRYPTO_NHPOLY1305 CRYPTO_NHPOLY1305_AVX2 CRYPTO_NHPOLY1305_SSE2 CRYPTO_PCBC CRYPTO_PCRYPT 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_SM3_AVX_X86_64 CRYPTO_SM4 CRYPTO_SM4_AESNI_AVX2_X86_64 CRYPTO_SM4_AESNI_AVX_X86_64 CRYPTO_SM4_GENERIC 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_WP512 CRYPTO_XCBC CRYPTO_XCTR CRYPTO_XTS CRYPTO_XXHASH CRYPTO_ZSTD CUSE CYPRESS_FIRMWARE DAMON DAMON_PADDR DAMON_RECLAIM DAMON_VADDR DCA DCB DEBUG_VFS DEFAULT_CODEL DMA_CMA FSCACHE FUSE_FS GPIOLIB HAMRADIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ ISA_BUS LIBNVDIMM MAC80211 MAC80211_DEBUGFS MAC80211_LEDS MEDIA_SUPPORT MMC MTD NET_CLS_U32 NET_SCH_DEFAULT PARTITION_ADVANCED PCCARD PCMCIA RFKILL SERIAL_DEV_BUS TLS TLS_DEVICE TRANSPARENT_HUGEPAGE USB_GADGET USB_PHY VLAN_8021Q WANT_COMPAT_NETLINK_MESSAGES WEXT_CORE WIRELESS WLAN WLAN_VENDOR_ATH X86_X32_ABI] disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing current HEAD 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb testing commit 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a457ca3432d04cdd01944620408f22c33e65c37990dc1ecbc07af40ee49bba35 all runs: OK false negative chance: 0.000 # git bisect start 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 Bisecting: 14624 revisions left to test after this (roughly 14 steps) [e237dfe70867f02de223e36340fe5f8b0fe0eada] Merge tag 'drm-misc-next-2025-11-05-1' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit e237dfe70867f02de223e36340fe5f8b0fe0eada gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ca5888724b3cf23a16418dc37c838a5d17ff3c6659d0e347cc0dd24cc2b9c081 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] # git bisect good e237dfe70867f02de223e36340fe5f8b0fe0eada Bisecting: 7311 revisions left to test after this (roughly 13 steps) [6dfafbd0299a60bfb5d5e277fdf100037c7ded07] Merge tag 'drm-next-2025-12-03' of https://gitlab.freedesktop.org/drm/kernel determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit 6dfafbd0299a60bfb5d5e277fdf100037c7ded07 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d70fbdd52d9627deeb836bde26fc2b0bc056e3a05622cd4e874cb326ae170afb all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] # git bisect good 6dfafbd0299a60bfb5d5e277fdf100037c7ded07 Bisecting: 3554 revisions left to test after this (roughly 12 steps) [0cac5ce06e524755b3dac1e0a060b05992076d93] Merge tag 'soc-dt-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit 0cac5ce06e524755b3dac1e0a060b05992076d93 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e32a27c3ca5c77aa4f46aba666397ee2c4a7dd332dca0282e5bc1fa3a7485db8 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] # git bisect good 0cac5ce06e524755b3dac1e0a060b05992076d93 Bisecting: 1822 revisions left to test after this (roughly 11 steps) [08bfcf4ff9d39228150a757803fc02dffce84ab0] docs: hwmon: fix link to g762 devicetree binding determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit 08bfcf4ff9d39228150a757803fc02dffce84ab0 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: bd22e4db2338dc08355e1a5af2772cfbec48b65a4abb724b4b1fc50c98f85634 all runs: OK false negative chance: 0.000 # git bisect bad 08bfcf4ff9d39228150a757803fc02dffce84ab0 Bisecting: 857 revisions left to test after this (roughly 10 steps) [509d3f45847627f4c5cdce004c3ec79262b5239c] Merge tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm determine whether the revision contains the guilty commit revision e237dfe70867f02de223e36340fe5f8b0fe0eada crashed and is reachable testing commit 509d3f45847627f4c5cdce004c3ec79262b5239c gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8914d306eb0b7957d4d9ddf2a2ff865808d881b94f31f868282d9327e6429f45 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] # git bisect good 509d3f45847627f4c5cdce004c3ec79262b5239c Bisecting: 453 revisions left to test after this (roughly 9 steps) [edf602a17b03e6bca31c48f34ac8fc3341503ac1] Merge tag 'tty-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty determine whether the revision contains the guilty commit revision e237dfe70867f02de223e36340fe5f8b0fe0eada crashed and is reachable testing commit edf602a17b03e6bca31c48f34ac8fc3341503ac1 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 58b942f9ce3d45b641c8f6dd472eec62f9d95e9532eee5e380fb5e1cd9d87e56 all runs: OK false negative chance: 0.000 # git bisect bad edf602a17b03e6bca31c48f34ac8fc3341503ac1 Bisecting: 202 revisions left to test after this (roughly 8 steps) [fb64bf480691369b589f6811c967db98b5a5f5a9] Merge tag 'mhi-for-v6.19' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/mani/mhi into char-misc-next determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit fb64bf480691369b589f6811c967db98b5a5f5a9 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e87df14e2cb244d97f46f4cc147e3544996b6183ba256c3a663a980edfa74f10 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] # git bisect good fb64bf480691369b589f6811c967db98b5a5f5a9 Bisecting: 101 revisions left to test after this (roughly 7 steps) [53688a9f3735588a57603f0edee58f6bd7b07b92] char/mwave: remove printk tracing determine whether the revision contains the guilty commit revision fb64bf480691369b589f6811c967db98b5a5f5a9 crashed and is reachable testing commit 53688a9f3735588a57603f0edee58f6bd7b07b92 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 97eb507f7797995988b3d2f4117252d22545175308d7598f5e47deeeed2837fd all runs: OK false negative chance: 0.000 # git bisect bad 53688a9f3735588a57603f0edee58f6bd7b07b92 Bisecting: 54 revisions left to test after this (roughly 6 steps) [60b52af082b1462e878d10a0298fad40a26a8b35] Merge branch 'icc-sm6350' into icc-next determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit 60b52af082b1462e878d10a0298fad40a26a8b35 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fb72635d435e92d0b5e3bddfcad6f465a67d8fb630afedd0f3ccb354e3d81e07 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] # git bisect good 60b52af082b1462e878d10a0298fad40a26a8b35 Bisecting: 27 revisions left to test after this (roughly 5 steps) [c7ea8eadd5d35311a2529f9f15095ac37dd9e2e3] dt-bindings: nvmem: imx-ocotp: Add support for i.MX94 determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit c7ea8eadd5d35311a2529f9f15095ac37dd9e2e3 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0b38f0af6051798376ed2d67ca17220697c2cfb5e3b34a0b3413f76200dba032 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] # git bisect good c7ea8eadd5d35311a2529f9f15095ac37dd9e2e3 Bisecting: 13 revisions left to test after this (roughly 4 steps) [f0a40fe2fc2c07827dfcee5ab070f3fe30413ed5] MAINTAINERS: Downgrade ocxl to Odd Fixes determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit f0a40fe2fc2c07827dfcee5ab070f3fe30413ed5 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: caac253569cbd3a6051fa3d634991406ac9b4fa45e4fd3a7da3f306c5d1e4588 all runs: crashed: KASAN: slab-use-after-free Read in bus_remove_driver representative crash: KASAN: slab-use-after-free Read in bus_remove_driver, types: [KASAN-USE-AFTER-FREE-READ] # git bisect good f0a40fe2fc2c07827dfcee5ab070f3fe30413ed5 Bisecting: 6 revisions left to test after this (roughly 3 steps) [d1b3b9c70e11cb4f40b4e41a4dc1503b9a3c0109] comedi: kcomedilib: Add loop checking variants of open and close determine whether the revision contains the guilty commit revision 3b08f56fbbb9ef75c7454487f8d3db80a84deef7 crashed and is reachable testing commit d1b3b9c70e11cb4f40b4e41a4dc1503b9a3c0109 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d802e0e7db9a2c34177066ca711ca65fe3377567a033205ee5b9add1b3e0acb7 all runs: OK false negative chance: 0.000 # git bisect bad d1b3b9c70e11cb4f40b4e41a4dc1503b9a3c0109 Bisecting: 3 revisions left to test after this (roughly 2 steps) [f24c6e3a39fa355dabfb684c9ca82db579534e72] comedi: multiq3: sanitize config options in multiq3_attach() determine whether the revision contains the guilty commit revision 60b52af082b1462e878d10a0298fad40a26a8b35 crashed and is reachable testing commit f24c6e3a39fa355dabfb684c9ca82db579534e72 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 2b97b30fd5ca68a0c7145c543ccf17cfe20d7607d453137b7b4460584f1b89e4 all runs: OK false negative chance: 0.000 # git bisect bad f24c6e3a39fa355dabfb684c9ca82db579534e72 Bisecting: 0 revisions left to test after this (roughly 1 step) [0de7d9cd07a2671fa6089173bccc0b2afe6b93ee] comedi: check device's attached status in compat ioctls determine whether the revision contains the guilty commit revision fb64bf480691369b589f6811c967db98b5a5f5a9 crashed and is reachable testing commit 0de7d9cd07a2671fa6089173bccc0b2afe6b93ee gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7fd2915637d1760f673b8ba864ada840ef628a706864bb6c261b116ef26aa86e all runs: OK false negative chance: 0.000 # git bisect bad 0de7d9cd07a2671fa6089173bccc0b2afe6b93ee Bisecting: 0 revisions left to test after this (roughly 0 steps) [72262330f7b3ad2130e800cecf02adcce3c32c77] comedi: c6xdigio: Fix invalid PNP driver unregistration determine whether the revision contains the guilty commit revision fb64bf480691369b589f6811c967db98b5a5f5a9 crashed and is reachable testing commit 72262330f7b3ad2130e800cecf02adcce3c32c77 gcc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a8be96fe5fb506954143bd6a0cc6ad6bfbd71b97efea898559deb09b5d64cf38 all runs: OK false negative chance: 0.000 # git bisect bad 72262330f7b3ad2130e800cecf02adcce3c32c77 72262330f7b3ad2130e800cecf02adcce3c32c77 is the first bad commit commit 72262330f7b3ad2130e800cecf02adcce3c32c77 Author: Ian Abbott Date: Thu Oct 23 13:31:41 2025 +0100 comedi: c6xdigio: Fix invalid PNP driver unregistration The Comedi low-level driver "c6xdigio" seems to be for a parallel port connected device. When the Comedi core calls the driver's Comedi "attach" handler `c6xdigio_attach()` to configure a Comedi to use this driver, it tries to enable the parallel port PNP resources by registering a PNP driver with `pnp_register_driver()`, but ignores the return value. (The `struct pnp_driver` it uses has only the `name` and `id_table` members filled in.) The driver's Comedi "detach" handler `c6xdigio_detach()` unconditionally unregisters the PNP driver with `pnp_unregister_driver()`. It is possible for `c6xdigio_attach()` to return an error before it calls `pnp_register_driver()` and it is possible for the call to `pnp_register_driver()` to return an error (that is ignored). In both cases, the driver should not be calling `pnp_unregister_driver()` as it does in `c6xdigio_detach()`. (Note that `c6xdigio_detach()` will be called by the Comedi core if `c6xdigio_attach()` returns an error, or if the Comedi core decides to detach the Comedi device from the driver for some other reason.) The unconditional call to `pnp_unregister_driver()` without a previous successful call to `pnp_register_driver()` will cause `driver_unregister()` to issue a warning "Unexpected driver unregister!". This was detected by Syzbot [1]. Also, the PNP driver registration and unregistration should be done at module init and exit time, respectively, not when attaching or detaching Comedi devices to the driver. (There might be more than one Comedi device being attached to the driver, although that is unlikely.) Change the driver to do the PNP driver registration at module init time, and the unregistration at module exit time. Since `c6xdigio_detach()` now only calls `comedi_legacy_detach()`, remove the function and change the Comedi driver "detach" handler to `comedi_legacy_detach`. ------------------------------------------- [1] Syzbot sample crash report: Unexpected driver unregister! WARNING: CPU: 0 PID: 5970 at drivers/base/driver.c:273 driver_unregister drivers/base/driver.c:273 [inline] WARNING: CPU: 0 PID: 5970 at drivers/base/driver.c:273 driver_unregister+0x90/0xb0 drivers/base/driver.c:270 Modules linked in: CPU: 0 UID: 0 PID: 5970 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:driver_unregister drivers/base/driver.c:273 [inline] RIP: 0010:driver_unregister+0x90/0xb0 drivers/base/driver.c:270 Code: 48 89 ef e8 c2 e6 82 fc 48 89 df e8 3a 93 ff ff 5b 5d e9 c3 6d d9 fb e8 be 6d d9 fb 90 48 c7 c7 e0 f8 1f 8c e8 51 a2 97 fb 90 <0f> 0b 90 90 5b 5d e9 a5 6d d9 fb e8 e0 f4 41 fc eb 94 e8 d9 f4 41 RSP: 0018:ffffc9000373f9a0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffffffff8ff24720 RCX: ffffffff817b6ee8 RDX: ffff88807c932480 RSI: ffffffff817b6ef5 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8ff24660 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88814cca0000 FS: 000055556dab1500(0000) GS:ffff8881249d9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f77f285cd0 CR3: 000000007d871000 CR4: 00000000003526f0 Call Trace: comedi_device_detach_locked+0x12f/0xa50 drivers/comedi/drivers.c:207 comedi_device_detach+0x67/0xb0 drivers/comedi/drivers.c:215 comedi_device_attach+0x43d/0x900 drivers/comedi/drivers.c:1011 do_devconfig_ioctl+0x1b1/0x710 drivers/comedi/comedi_fops.c:872 comedi_unlocked_ioctl+0x165d/0x2f00 drivers/comedi/comedi_fops.c:2178 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc05798eec9 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:00007ffcf8184238 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc057be5fa0 RCX: 00007fc05798eec9 RDX: 0000200000000080 RSI: 0000000040946400 RDI: 0000000000000003 RBP: 00007fc057a11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc057be5fa0 R14: 00007fc057be5fa0 R15: 0000000000000003 ------------------------------------------- Reported-by: syzbot+6616bba359cec7a1def1@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=6616bba359cec7a1def1 Fixes: 2c89e159cd2f ("Staging: comedi: add c6xdigio driver") Cc: stable Signed-off-by: Ian Abbott Link: https://patch.msgid.link/20251023123141.6537-1-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman drivers/comedi/drivers/c6xdigio.c | 46 +++++++++++++++++++++++++++++---------- 1 file changed, 35 insertions(+), 11 deletions(-) accumulated error probability: 0.00 culprit signature: a8be96fe5fb506954143bd6a0cc6ad6bfbd71b97efea898559deb09b5d64cf38 parent signature: caac253569cbd3a6051fa3d634991406ac9b4fa45e4fd3a7da3f306c5d1e4588 revisions tested: 23, total time: 10h46m18.63300142s (build: 7h30m43.817857144s, test: 2h39m12.052397984s) first good commit: 72262330f7b3ad2130e800cecf02adcce3c32c77 comedi: c6xdigio: Fix invalid PNP driver unregistration recipients (to): ["abbotti@mev.co.uk" "abbotti@mev.co.uk" "gregkh@linuxfoundation.org" "hsweeten@visionengravers.com" "linux-kernel@vger.kernel.org"] recipients (cc): ["gregkh@linuxfoundation.org"]