ci2 starts bisection 2025-08-23 02:19:59.423732343 +0000 UTC m=+82549.186895314 bisecting fixing commit since dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 building syzkaller on 3cda49cfaa8556b73277ccd7e75952f0f2de2d74 ensuring issue is reproducible on original commit dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 testing commit dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: a9439a92d9955a41464eb2caedcdc13adfe41dfb29713f7c7473d297085e325f all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 26d6165610e8bc3e7a727c308bf239c06d2887de3d8be279a0ffd7ea4649b84e all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] the bug reproduces without the instrumentation disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed kconfig minimization: base=3829 full=7620 leaves diff=2130 split chunks (needed=false): <2130> split chunk #0 of len 2130 into 5 parts testing without sub-chunk 1/5 disabling configs for [locking atomic_sleep hang memleak ubsan kasan], they are not needed testing commit dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: d5ed25be81ee26942d404f1440b8497773752b434b203ba892ad50134e70645e all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [memleak ubsan kasan locking atomic_sleep hang], they are not needed testing commit dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: f53d03a3d73173fa748541cd49da21d407079c906686e33d10503e469cd765df all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed testing commit dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: a070f6115940f9fbb0993d6b2ccafbb5a8f1d94f24860ccc97aaa7a10302bb19 all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed testing commit dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 8895afff16be0dc342b7704f51de590f41313547e70bcdcacdf0e1e7bb433fbc all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [locking atomic_sleep hang memleak ubsan kasan], they are not needed testing commit dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 86dc9960eb080ee525aa530e1dfa8a881d97568b0e333e081d0c00a2d20c312f all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] the chunk can be dropped minimized to 426 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_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 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_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 BCMA BCMA_HOST_PCI_POSSIBLE BEFS_FS BFQ_CGROUP_DEBUG BFQ_GROUP_IOSCHED BFS_FS BIG_KEYS BLK_CGROUP_RWSTAT BLK_DEBUG_FS_ZONED BLK_DEV_BSGLIB BLK_DEV_INTEGRITY BLK_DEV_INTEGRITY_T10 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_MQ_RDMA 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_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_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_HIDP BT_HS BT_INTEL BT_LE BT_LEDS BT_MSFTEXT BT_MTK 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_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_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 CLS_U32_MARK CLS_U32_PERF CMA CMA_SIZE_SEL_MBYTES 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 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_CHACHA20 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_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_ECB CRYPTO_ECC 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_CHACHA_GENERIC CRYPTO_LIB_CURVE25519 CRYPTO_LIB_CURVE25519_GENERIC CRYPTO_LIB_DES CRYPTO_LIB_POLY1305 CRYPTO_LIB_POLY1305_GENERIC CRYPTO_LRW CRYPTO_MICHAEL_MIC 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_SHA3 CRYPTO_SHA512_SSSE3 CRYPTO_SIMD CRYPTO_SM2 CRYPTO_SM3 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_VMAC CRYPTO_WP512 CRYPTO_XCBC CRYPTO_XCTR CRYPTO_XTS CRYPTO_XXHASH CUSE CYPRESS_FIRMWARE DAMON DAMON_DBGFS DAMON_PADDR DAMON_RECLAIM DAMON_VADDR DCA DCB DEFAULT_PFIFO_FAST DMA_CMA FSCACHE FUSE_FS GPIOLIB HAMRADIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ ISDN ISDN_CAPI LIBNVDIMM MAC80211 MAC80211_LEDS MEDIA_SUPPORT MTD NET_CLS_U32 NET_SCH_DEFAULT PARTITION_ADVANCED PCCARD PCMCIA RFKILL SERIAL_DEV_BUS TLS TLS_DEVICE USB_GADGET USB_PHY VLAN_8021Q WANT_COMPAT_NETLINK_MESSAGES WEXT_CORE WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ATH] disabling configs for [memleak ubsan kasan locking atomic_sleep hang], they are not needed testing current HEAD 0bc96de781b4da716c8dbd248af4b26d8d8341f5 testing commit 0bc96de781b4da716c8dbd248af4b26d8d8341f5 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: cb4046157b97817bc262c858f51d5dcc6121a05e2e5b211030543ebe7a85fe88 all runs: OK false negative chance: 0.000 # git bisect start 0bc96de781b4da716c8dbd248af4b26d8d8341f5 dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 Bisecting: 212 revisions left to test after this (roughly 8 steps) [38fbab9365be46c2bfcbddb7b64245042c560511] selftests: mptcp: connect: also cover checksum determine whether the revision contains the guilty commit revision dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 crashed and is reachable testing commit 38fbab9365be46c2bfcbddb7b64245042c560511 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 9055e2ea936be8587882fc1dc3513ffaaf265b247764db906995d7d62b0f06bd all runs: OK false negative chance: 0.000 # git bisect bad 38fbab9365be46c2bfcbddb7b64245042c560511 Bisecting: 105 revisions left to test after this (roughly 7 steps) [9b0d2df839f21b39746c7a37ea139a538c57e93d] phonet/pep: Move call to pn_skb_get_dst_sockaddr() earlier in pep_sock_accept() determine whether the revision contains the guilty commit revision dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 crashed and is reachable testing commit 9b0d2df839f21b39746c7a37ea139a538c57e93d gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: cddead9eadc95b3613c2a56e3dfe287dd6ddb2a413f80f8253fcb97b70406bb6 all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] # git bisect good 9b0d2df839f21b39746c7a37ea139a538c57e93d Bisecting: 52 revisions left to test after this (roughly 6 steps) [d717325b5ecf2a40daca85c61923e17f32306179] clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns determine whether the revision contains the guilty commit revision dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 crashed and is reachable testing commit d717325b5ecf2a40daca85c61923e17f32306179 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: b431d8c73900a5c7a68d473025be64da85600516f435265cc3fb6198315f720a all runs: OK false negative chance: 0.000 # git bisect bad d717325b5ecf2a40daca85c61923e17f32306179 Bisecting: 26 revisions left to test after this (roughly 5 steps) [d3436638738ace8f101af7bdee2eae1bc38e9b29] comedi: Fix initialization of data for instructions that write to subdevice determine whether the revision contains the guilty commit revision 9b0d2df839f21b39746c7a37ea139a538c57e93d crashed and is reachable testing commit d3436638738ace8f101af7bdee2eae1bc38e9b29 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 5c8fc517d9f6edf6e22057c4b1651f02d808200109d753451d385d5c726ffca2 all runs: OK false negative chance: 0.000 # git bisect bad d3436638738ace8f101af7bdee2eae1bc38e9b29 Bisecting: 12 revisions left to test after this (roughly 4 steps) [a7ba7eb9abb45bf9b469b1cff55ce7644fc0c9ef] soc: aspeed: lpc-snoop: Cleanup resources in stack-order determine whether the revision contains the guilty commit revision 9b0d2df839f21b39746c7a37ea139a538c57e93d crashed and is reachable testing commit a7ba7eb9abb45bf9b469b1cff55ce7644fc0c9ef gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: bd6da0ee91362c26dec964051944d40191ea1878cb83c8cfb32124a26cfa0d7f all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] # git bisect good a7ba7eb9abb45bf9b469b1cff55ce7644fc0c9ef Bisecting: 6 revisions left to test after this (roughly 3 steps) [5bfa301e1e59a9b1a7b62a800b54852337c97416] comedi: pcl812: Fix bit shift out of bounds determine whether the revision contains the guilty commit revision dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 crashed and is reachable testing commit 5bfa301e1e59a9b1a7b62a800b54852337c97416 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: cfc0a31197ec645116e2a9d6c79cbd9028f7c564fc811962f39d87b822dca73f all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] # git bisect good 5bfa301e1e59a9b1a7b62a800b54852337c97416 Bisecting: 3 revisions left to test after this (roughly 2 steps) [a18a42e77545afcacd6a2b8d9fc16191b87454df] comedi: das6402: Fix bit shift out of bounds determine whether the revision contains the guilty commit revision 9b0d2df839f21b39746c7a37ea139a538c57e93d crashed and is reachable testing commit a18a42e77545afcacd6a2b8d9fc16191b87454df gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 240bf271fd90dbd806706e5fc5983189b614133ac74348f48efbfc451f77685a all runs: crashed: WARNING in comedi_unlocked_ioctl representative crash: WARNING in comedi_unlocked_ioctl, types: [WARNING] # git bisect good a18a42e77545afcacd6a2b8d9fc16191b87454df Bisecting: 1 revision left to test after this (roughly 1 step) [281d129350d3ca289cc6a82eccf2d46d4e45379c] comedi: Fix some signed shift left operations determine whether the revision contains the guilty commit revision dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 crashed and is reachable testing commit 281d129350d3ca289cc6a82eccf2d46d4e45379c gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 469138d656179bf388cab2d8a81a3fbfa600aa8e95dca4fe3dc23fdfab2cc879 all runs: OK false negative chance: 0.000 # git bisect bad 281d129350d3ca289cc6a82eccf2d46d4e45379c Bisecting: 0 revisions left to test after this (roughly 0 steps) [d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3] comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large determine whether the revision contains the guilty commit revision dfc486ec9cce9eaaeb72cca8fcf04cd1ed230905 crashed and is reachable testing commit d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 81a90d3f8f7a6050105b2463b6d978b07d9dfeabc213538985643a24ee634e3f all runs: OK false negative chance: 0.000 # git bisect bad d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 is the first bad commit commit d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 Author: Ian Abbott Date: Fri Jul 4 13:04:05 2025 +0100 comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large commit 08ae4b20f5e82101d77326ecab9089e110f224cc upstream. The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to hold the array of `struct comedi_insn`, getting the length from the `n_insns` member of the `struct comedi_insnlist` supplied by the user. The allocation will fail with a WARNING and a stack dump if it is too large. Avoid that by failing with an `-EINVAL` error if the supplied `n_insns` value is unreasonable. Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set this to the same value as `MAX_SAMPLES` (65536), which is the maximum allowed sum of the values of the member `n` in the array of `struct comedi_insn`, and sensible comedi instructions will have an `n` of at least 1. Reported-by: syzbot+d6995b62e5ac7d79557a@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=d6995b62e5ac7d79557a Fixes: ed9eccbe8970 ("Staging: add comedi core") Tested-by: Ian Abbott Cc: stable@vger.kernel.org # 5.13+ Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20250704120405.83028-1-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman drivers/comedi/comedi_fops.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) accumulated error probability: 0.00 culprit signature: 81a90d3f8f7a6050105b2463b6d978b07d9dfeabc213538985643a24ee634e3f parent signature: 240bf271fd90dbd806706e5fc5983189b614133ac74348f48efbfc451f77685a revisions tested: 17, total time: 4h35m5.981518895s (build: 2h5m19.25815012s, test: 2h22m28.659861423s) first good commit: d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large recipients (to): ["abbotti@mev.co.uk" "gregkh@linuxfoundation.org"] recipients (cc): []