ci2 starts bisection 2025-10-10 14:56:22.334942187 +0000 UTC m=+53781.113408684 bisecting fixing commit since 1c700860e8bc079c5c71d73c55e51865d273943c building syzkaller on 6b6b5f21aadcc3fc3ccd91da0b782a4307229d70 ensuring issue is reproducible on original commit 1c700860e8bc079c5c71d73c55e51865d273943c testing commit 1c700860e8bc079c5c71d73c55e51865d273943c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e63e5a4efb421c543d6be38e5666a2cce64f31ac3a95479a30f323712a6afb65 all runs: crashed: general protection fault in btrfs_reada_add representative crash: general protection fault in btrfs_reada_add, types: [DoS] check whether we can drop unnecessary instrumentation disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 1c700860e8bc079c5c71d73c55e51865d273943c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c7953f0ff0a1c0d80807f28ab286c5e48153b651ba4d047808b63087aaa808ad all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add, types: [NULL-POINTER-DEREFERENCE] the bug reproduces without the instrumentation disabling configs for [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed kconfig minimization: base=3707 full=7306 leaves diff=2039 split chunks (needed=false): <2039> split chunk #0 of len 2039 into 5 parts testing without sub-chunk 1/5 disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit 1c700860e8bc079c5c71d73c55e51865d273943c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8113526725917430e56272d1dab7a1415620dbac4eb9d7557731183b0785b109 all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed testing commit 1c700860e8bc079c5c71d73c55e51865d273943c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f72c2ac0817cdf5186498bdf749be38cc565fcb5826ce7d3a12be4bc9f40e1d8 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 1c700860e8bc079c5c71d73c55e51865d273943c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e190f5099ec4833f548c020e9d574b064244e548245f8b2b759007dc533b7e64 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit 1c700860e8bc079c5c71d73c55e51865d273943c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 525e30877f746fca3f47cd6062dc441d0a6a584019196e3eaf15300a19e8b225 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 1c700860e8bc079c5c71d73c55e51865d273943c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6bbf0f6e6f45b59b36d8e74023f3610e0e8bcc183e755f460510c3984e146d02 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped minimized to 408 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 ANDROID_BINDERFS ANDROID_BINDER_IPC APPLE_MFI_FASTCHARGE AR5523 ARCH_ENABLE_MEMORY_HOTREMOVE ARCH_ENABLE_THP_MIGRATION ASHMEM ASM_MODVERSIONS ASN1_ENCODER 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 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 BLK_CGROUP_IOCOST BLK_CGROUP_IOLATENCY BLK_CGROUP_RWSTAT BLK_DEBUG_FS_ZONED BLK_DEV_BSGLIB BLK_DEV_CRYPTOLOOP 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_DEV_ZONED BLK_INLINE_ENCRYPTION BLK_INLINE_ENCRYPTION_FALLBACK BLK_MQ_RDMA BLK_RQ_ALLOC_TIME BLK_WBT BLK_WBT_MQ BLOCK_LEGACY_AUTOLOAD BONDING 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_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_USB2 CAN_ETAS_ES58X CAN_GS_USB CAN_GW CAN_IFI_CANFD CAN_ISOTP CAN_J1939 CAN_KVASER_USB CAN_MCBA_USB 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 CGROUP_DEVICE CGROUP_HUGETLB CGROUP_NET_CLASSID CGROUP_NET_PRIO CGROUP_PERF CGROUP_RDMA CGROUP_WRITEBACK 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_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 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_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_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_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_LIB_SM4 CRYPTO_LRW CRYPTO_MICHAEL_MIC CRYPTO_NHPOLY1305 CRYPTO_NHPOLY1305_AVX2 CRYPTO_NHPOLY1305_SSE2 CRYPTO_PCBC CRYPTO_PCRYPT CRYPTO_POLY1305 CRYPTO_POLY1305_X86_64 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_SM4 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_XTS CRYPTO_XXHASH CUSE CYPRESS_FIRMWARE DAMON DAMON_DBGFS DAMON_VADDR DAX DCA DCB DEBUG_PREEMPT DEFAULT_PFIFO_FAST DEVICE_PRIVATE DEV_COREDUMP DEV_DAX DEV_PAGEMAP_OPS DIMLIB DLN2_ADC DMABUF_HEAPS DMABUF_HEAPS_CMA DMABUF_HEAPS_SYSTEM DMABUF_MOVE_NOTIFY DMA_CMA DMA_ENGINE_RAID 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_BOCHS DRM_BRIDGE DRM_CIRRUS_QEMU DRM_DEBUG_MM DRM_DP_AUX_CHARDEV 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_ORIENTATION_QUIRKS DRM_SIMPLEDRM DRM_TTM DRM_TTM_HELPER ENCRYPTED_KEYS FSCACHE FUSE_FS HAMRADIO HID_DRAGONRISE IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ ISDN ISDN_CAPI LIBNVDIMM MAC80211 MAC80211_LEDS MEDIA_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MTD NET_CLS_U32 NET_SCH_DEFAULT PARTITION_ADVANCED PREEMPTION RFKILL SERIAL_DEV_BUS STAGING TCG_TPM 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 ZONE_DEVICE] disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed determining the merge base between 1c700860e8bc079c5c71d73c55e51865d273943c and 5472d60c129f75282d94ae5ad072ee6dfb7c7246 8bb7eca972ad531c9b149c0a51ab43a417385813/Linux 5.15 is a merge base, check if it has the bug testing commit 8bb7eca972ad531c9b149c0a51ab43a417385813 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0f095dc09f59b63a1b0f2d8c2862c70457f9c5142e4602e1a786b37c55fc0a54 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_reada_add, types: [NULL-POINTER-DEREFERENCE] testing current HEAD 5472d60c129f75282d94ae5ad072ee6dfb7c7246 testing commit 5472d60c129f75282d94ae5ad072ee6dfb7c7246 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 63e2dd2519176bc12b271c16d819df75a4273b089b3ff70694f01005a50a8913 all runs: OK false negative chance: 0.000 # git bisect start 5472d60c129f75282d94ae5ad072ee6dfb7c7246 8bb7eca972ad531c9b149c0a51ab43a417385813 Bisecting: 175817 revisions left to test after this (roughly 18 steps) [9e87705289667a6c5185c619ea32f3d39314eb1b] Merge tag 'bcachefs-2023-10-30' of https://evilpiepirate.org/git/bcachefs determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit 9e87705289667a6c5185c619ea32f3d39314eb1b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 982c4115ff5adc86e351d3ef7846059ed5e591283d08776a8d1ae9bcec64b01a all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap, types: [NULL-POINTER-DEREFERENCE] # git bisect good 9e87705289667a6c5185c619ea32f3d39314eb1b Bisecting: 87989 revisions left to test after this (roughly 17 steps) [9c44575c78dbcdf89bd9f9bc3869ce8ab5cc1272] Merge tag 'bitmap-for-6.12' of https://github.com/norov/linux determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit 9c44575c78dbcdf89bd9f9bc3869ce8ab5cc1272 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 602b2ca83b8b8f1ad08c4c104cf0f8669fae33c732ff8fc6e4bde4a0804914de all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap, types: [NULL-POINTER-DEREFERENCE] # git bisect good 9c44575c78dbcdf89bd9f9bc3869ce8ab5cc1272 Bisecting: 44036 revisions left to test after this (roughly 16 steps) [4f822ad5ee944ffafc21937a32dd055f1df5c28d] Merge 6.15-rc4 into char-misc-next determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit 4f822ad5ee944ffafc21937a32dd055f1df5c28d gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 6e3d62f62181e6141c66006d8c69fd64a85b3885ffae9d46478965d44ea997c5 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap, types: [NULL-POINTER-DEREFERENCE] # git bisect good 4f822ad5ee944ffafc21937a32dd055f1df5c28d Bisecting: 22533 revisions left to test after this (roughly 15 steps) [33503c083fda048c77903460ac0429e1e2c0e341] io_uring/memmap: cast nr_pages to size_t before shifting determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit 33503c083fda048c77903460ac0429e1e2c0e341 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: ddccfb82f2b98be863eba3c974398878c0d963c703361091370e0c07ea092cd2 all runs: OK false negative chance: 0.000 # git bisect bad 33503c083fda048c77903460ac0429e1e2c0e341 Bisecting: 10932 revisions left to test after this (roughly 13 steps) [f79749a8e42b3a6dcb980e87f3ef752962b9f094] Merge tag 'soc-defconfig-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit f79749a8e42b3a6dcb980e87f3ef752962b9f094 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 7874095804e942a8c6187381cb7baa52a605948260822f8196fccf6c0073116d all runs: OK false negative chance: 0.000 # git bisect bad f79749a8e42b3a6dcb980e87f3ef752962b9f094 Bisecting: 5411 revisions left to test after this (roughly 12 steps) [a61e26038143727d9b0f1bc01b0370f77f2ad7e4] Merge tag 'media/v6.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media determine whether the revision contains the guilty commit revision 9e87705289667a6c5185c619ea32f3d39314eb1b crashed and is reachable testing commit a61e26038143727d9b0f1bc01b0370f77f2ad7e4 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: ad92edc83ce63c5947caf94563190564f703ac0eaed7d919723648e0b8a0aaf1 all runs: OK false negative chance: 0.000 # git bisect bad a61e26038143727d9b0f1bc01b0370f77f2ad7e4 Bisecting: 2598 revisions left to test after this (roughly 11 steps) [ba450370980aeae32197b74c27e4563281cd3aaa] Merge tag 'linux_kselftest-kunit-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest determine whether the revision contains the guilty commit revision 9e87705289667a6c5185c619ea32f3d39314eb1b crashed and is reachable testing commit ba450370980aeae32197b74c27e4563281cd3aaa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 5b65979c746e20132a5e063932c907bb891d4ddec754310a5b499f67d88a027e all runs: OK false negative chance: 0.000 # git bisect bad ba450370980aeae32197b74c27e4563281cd3aaa Bisecting: 1270 revisions left to test after this (roughly 10 steps) [8dd53535f1e129b7d75c512dc271bff76461ab6b] Merge tag 'vfs-6.16-rc1.super' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit 8dd53535f1e129b7d75c512dc271bff76461ab6b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: b166d5fe575856c1b05f259b65838af148bfba1f2a2e8034ecafd39a3e9cca4b all runs: OK false negative chance: 0.000 # git bisect bad 8dd53535f1e129b7d75c512dc271bff76461ab6b Bisecting: 644 revisions left to test after this (roughly 9 steps) [fea9123979fe892f41ca39d9d0226c1e193b0880] Merge tag 'input-for-v6.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit fea9123979fe892f41ca39d9d0226c1e193b0880 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 37e44f00d05ed639135b670c68cbf564c4b5d63d16dc8561f008daf4c6ee5607 all runs: OK false negative chance: 0.000 # git bisect bad fea9123979fe892f41ca39d9d0226c1e193b0880 Bisecting: 321 revisions left to test after this (roughly 8 steps) [68025adfc13e6cd15eebe2293f77659f47daf13b] um: fix _nofault accesses determine whether the revision contains the guilty commit revision 9e87705289667a6c5185c619ea32f3d39314eb1b crashed and is reachable testing commit 68025adfc13e6cd15eebe2293f77659f47daf13b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 5149a9700f8070ddb309349b0e32b94cfe92fecd8c7664ccf7321765cabd6163 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap, types: [NULL-POINTER-DEREFERENCE] # git bisect good 68025adfc13e6cd15eebe2293f77659f47daf13b Bisecting: 162 revisions left to test after this (roughly 7 steps) [50358c251eae19a2b2fc54b6944e362ef2fefff0] Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux determine whether the revision contains the guilty commit revision 9e87705289667a6c5185c619ea32f3d39314eb1b crashed and is reachable testing commit 50358c251eae19a2b2fc54b6944e362ef2fefff0 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: b1beb8f9469f3629dfe6530ba5f9c981be5a1632a6c64bda4ab88040f4002bb0 all runs: OK false negative chance: 0.000 # git bisect bad 50358c251eae19a2b2fc54b6944e362ef2fefff0 Bisecting: 92 revisions left to test after this (roughly 6 steps) [3c44b2d615e6ee08d650c2864fdc4e68493eac0c] Merge branch 'virtio-net-fix-total-qstat-values' determine whether the revision contains the guilty commit revision 9e87705289667a6c5185c619ea32f3d39314eb1b crashed and is reachable testing commit 3c44b2d615e6ee08d650c2864fdc4e68493eac0c gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 1f5b13d4bcc7b233e8e6a402ce015b02710db4dd8bda1c3876e08bb75dcf9177 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap, types: [NULL-POINTER-DEREFERENCE] # git bisect good 3c44b2d615e6ee08d650c2864fdc4e68493eac0c Bisecting: 45 revisions left to test after this (roughly 6 steps) [80ae5fb2296cf93add51368a96985ed9a18df781] Merge tag 'v6.15-rc5-ksmbd-server-fixes' of git://git.samba.org/ksmbd determine whether the revision contains the guilty commit revision 68025adfc13e6cd15eebe2293f77659f47daf13b crashed and is reachable testing commit 80ae5fb2296cf93add51368a96985ed9a18df781 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 0c0a23161d3119d5497ac89b52c0d7b20af7358fbab61bba580a8a50f8389f91 all runs: OK false negative chance: 0.000 # git bisect bad 80ae5fb2296cf93add51368a96985ed9a18df781 Bisecting: 22 revisions left to test after this (roughly 5 steps) [cccd03371475e4c25ddad7f5b2467d9b4d3f5a09] Merge tag 'for-6.15/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit cccd03371475e4c25ddad7f5b2467d9b4d3f5a09 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 87185ffbe7c3e7086c70c88eb891eb2763bb42810170fb4ac8a15a6891e1af3f all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap, types: [NULL-POINTER-DEREFERENCE] # git bisect good cccd03371475e4c25ddad7f5b2467d9b4d3f5a09 Bisecting: 9 revisions left to test after this (roughly 4 steps) [707df3375124b51048233625a7e1c801e8c8a7fd] Merge tag 'media/v6.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit 707df3375124b51048233625a7e1c801e8c8a7fd gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 17122ea033265c51a9ef9ba548d6517e45550b84989d3d7099183442147ac30c all runs: OK false negative chance: 0.000 # git bisect bad 707df3375124b51048233625a7e1c801e8c8a7fd Bisecting: 6 revisions left to test after this (roughly 3 steps) [38e541051e1d19e8b1479a6af587a7884653e041] btrfs: open code folio_index() in btree_clear_folio_dirty_tag() determine whether the revision contains the guilty commit revision 9c44575c78dbcdf89bd9f9bc3869ce8ab5cc1272 crashed and is reachable testing commit 38e541051e1d19e8b1479a6af587a7884653e041 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 06c503e0468ae52ab942988d84df41b04a6dc95b9e3b0b6c0854f0f8bcd011f6 all runs: OK false negative chance: 0.000 # git bisect bad 38e541051e1d19e8b1479a6af587a7884653e041 Bisecting: 2 revisions left to test after this (roughly 2 steps) [d6fe0c69b3aa5c985380b794bdf8e6e9b1811e60] btrfs: handle empty eb->folios in num_extent_folios() determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit d6fe0c69b3aa5c985380b794bdf8e6e9b1811e60 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 71b9d85cc538771d815ab728eabf937f60fcde17d33e9e783ac1fb8aef612a9e all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap representative crash: BUG: unable to handle kernel NULL pointer dereference in btrfs_lookup_csums_bitmap, types: [NULL-POINTER-DEREFERENCE] # git bisect good d6fe0c69b3aa5c985380b794bdf8e6e9b1811e60 Bisecting: 0 revisions left to test after this (roughly 1 step) [8fb1dcbbcc1ffe6ed7cf3f0f96d2737491dd1fbf] Revert "btrfs: canonicalize the device path before adding it" determine whether the revision contains the guilty commit revision 8bb7eca972ad531c9b149c0a51ab43a417385813 crashed and is reachable testing commit 8fb1dcbbcc1ffe6ed7cf3f0f96d2737491dd1fbf gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: b688578ec79cbc017cb07ee27bf983378ceb0c115410c7e9afdd3f87f680fcbc all runs: OK false negative chance: 0.000 # git bisect bad 8fb1dcbbcc1ffe6ed7cf3f0f96d2737491dd1fbf Bisecting: 0 revisions left to test after this (roughly 0 steps) [f95d186255b319c48a365d47b69bd997fecb674e] btrfs: avoid NULL pointer dereference if no valid csum tree determine whether the revision contains the guilty commit revision 9e87705289667a6c5185c619ea32f3d39314eb1b crashed and is reachable testing commit f95d186255b319c48a365d47b69bd997fecb674e gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: e234c0882b9aa1820cb1782c62071d41d997ed0f5ae1162f7f9d9f9a91814c8f all runs: OK false negative chance: 0.000 # git bisect bad f95d186255b319c48a365d47b69bd997fecb674e f95d186255b319c48a365d47b69bd997fecb674e is the first bad commit commit f95d186255b319c48a365d47b69bd997fecb674e Author: Qu Wenruo Date: Tue Apr 29 15:17:50 2025 +0930 btrfs: avoid NULL pointer dereference if no valid csum tree [BUG] When trying read-only scrub on a btrfs with rescue=idatacsums mount option, it will crash with the following call trace: BUG: kernel NULL pointer dereference, address: 0000000000000208 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page CPU: 1 UID: 0 PID: 835 Comm: btrfs Tainted: G O 6.15.0-rc3-custom+ #236 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022 RIP: 0010:btrfs_lookup_csums_bitmap+0x49/0x480 [btrfs] Call Trace: scrub_find_fill_first_stripe+0x35b/0x3d0 [btrfs] scrub_simple_mirror+0x175/0x290 [btrfs] scrub_stripe+0x5f7/0x6f0 [btrfs] scrub_chunk+0x9a/0x150 [btrfs] scrub_enumerate_chunks+0x333/0x660 [btrfs] btrfs_scrub_dev+0x23e/0x600 [btrfs] btrfs_ioctl+0x1dcf/0x2f80 [btrfs] __x64_sys_ioctl+0x97/0xc0 do_syscall_64+0x4f/0x120 entry_SYSCALL_64_after_hwframe+0x76/0x7e [CAUSE] Mount option "rescue=idatacsums" will completely skip loading the csum tree, so that any data read will not find any data csum thus we will ignore data checksum verification. Normally call sites utilizing csum tree will check the fs state flag NO_DATA_CSUMS bit, but unfortunately scrub does not check that bit at all. This results in scrub to call btrfs_search_slot() on a NULL pointer and triggered above crash. [FIX] Check both extent and csum tree root before doing any tree search. Reviewed-by: Johannes Thumshirn Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba fs/btrfs/scrub.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) accumulated error probability: 0.00 culprit signature: e234c0882b9aa1820cb1782c62071d41d997ed0f5ae1162f7f9d9f9a91814c8f parent signature: 71b9d85cc538771d815ab728eabf937f60fcde17d33e9e783ac1fb8aef612a9e revisions tested: 28, total time: 7h38m22.746471699s (build: 3h28m34.443721515s, test: 3h37m25.922124801s) first good commit: f95d186255b319c48a365d47b69bd997fecb674e btrfs: avoid NULL pointer dereference if no valid csum tree recipients (to): ["dsterba@suse.com" "johannes.thumshirn@wdc.com" "wqu@suse.com"] recipients (cc): []