ci2 starts bisection 2025-12-21 22:29:43.744550168 +0000 UTC m=+2192395.921673225 bisecting fixing commit since e617101e562654c7d59ed5cfcd30f610f1f64411 building syzkaller on 49379ee008e5f2af6e551c2e23fcd6b1ebb4d5c2 ensuring issue is reproducible on original commit e617101e562654c7d59ed5cfcd30f610f1f64411 testing commit e617101e562654c7d59ed5cfcd30f610f1f64411 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 64a26b84914fe9b0ed5898e02366a31efd2618ea86e820488a78c20b8fbd3093 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] check whether we can drop unnecessary instrumentation disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit e617101e562654c7d59ed5cfcd30f610f1f64411 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: bbf58fb5bf3c35aa54fa48b92bcd4640de2315523708a9427e9569674b4da501 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] the bug reproduces without the instrumentation disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed kconfig minimization: base=3913 full=7800 leaves diff=2160 split chunks (needed=false): <2160> split chunk #0 of len 2160 into 5 parts testing without sub-chunk 1/5 disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed testing commit e617101e562654c7d59ed5cfcd30f610f1f64411 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 9c2fe7b45e23d4c1f99bc381efb718e08ee5fd76a11ddc95ed38be1e5c4025aa all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit e617101e562654c7d59ed5cfcd30f610f1f64411 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 549f6dc5a72f5e46999b924fbadcc9439f9030a9e6e5734071029bdc8fe95396 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed testing commit e617101e562654c7d59ed5cfcd30f610f1f64411 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 1f0dfb5faf503c3e822fcb85cc7b4c833afe1e57a753dde71bcd6ad3b872d4b1 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed testing commit e617101e562654c7d59ed5cfcd30f610f1f64411 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 9dc8636849fbf1000885da1da7e42cce2d32b2c0c8b715983715f779b4ac3fde all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit e617101e562654c7d59ed5cfcd30f610f1f64411 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 11d78dcab63c33899070ce9ab5c0937cc8c6d2918991e8d62de31c979b7b31cb all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] the chunk can be dropped minimized to 432 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_MEMORY_HOTREMOVE ARCH_ENABLE_THP_MIGRATION 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_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_PUNT_BIO 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_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_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_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_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_F81604 CAN_GS_USB CAN_GW CAN_IFI_CANFD CAN_ISOTP CAN_J1939 CAN_KVASER_USB CAN_MCBA_USB CAN_NETLINK CAN_PEAK_USB CAN_RAW CAN_RX_OFFLOAD CAN_SLCAN CAN_UCAN CAN_VCAN CAN_VXCAN CAPI_TRACE CARL9170 CARL9170_HWRNG CARL9170_LEDS CARL9170_WPC CEC_CORE CEPH_FS CEPH_FSCACHE CEPH_FS_POSIX_ACL CEPH_LIB CEPH_LIB_USE_DNS_RESOLVER CFG80211 CFG80211_CRDA_SUPPORT CFG80211_DEBUGFS CFG80211_DEFAULT_PS CFG80211_REQUIRE_SIGNED_REGDB CFG80211_USE_KERNEL_REGDB_KEYS CFG80211_WEXT CFS_BANDWIDTH 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_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 DAX DCA DCB DEFAULT_PFIFO_FAST DEVICE_MIGRATION DEVICE_PRIVATE DEV_COREDUMP DEV_DAX DIMLIB 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 MEMORY_HOTPLUG MEMORY_HOTREMOVE 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 WIRELESS_EXT WLAN WLAN_VENDOR_ATH ZONE_DEVICE] disabling configs for [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed determining the merge base between e617101e562654c7d59ed5cfcd30f610f1f64411 and 9094662f6707d1d4b53d18baba459604e8bb0783 ffc253263a1375a65fa6c9f62a893e9767fbebfa/Linux 6.6 is a merge base, check if it has the bug testing commit ffc253263a1375a65fa6c9f62a893e9767fbebfa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 8916f1e08c371be0f7b829241b03b90dc76bd317a1ec9f536764b8d0aad979d3 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] testing current HEAD 9094662f6707d1d4b53d18baba459604e8bb0783 testing commit 9094662f6707d1d4b53d18baba459604e8bb0783 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: d090aff68daa8148386f7aaefea08d8a1a0e61c522ad9aa1137f160bc275585f all runs: OK false negative chance: 0.000 # git bisect start 9094662f6707d1d4b53d18baba459604e8bb0783 ffc253263a1375a65fa6c9f62a893e9767fbebfa Bisecting: 97552 revisions left to test after this (roughly 17 steps) [9c39d5ab450f7181775957000f4aff33bfef9f7b] Merge tag 'soc-dt-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit 9c39d5ab450f7181775957000f4aff33bfef9f7b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 2c58ae7241c281534b97c34046cdc51a0424383b224b987ce4ce9bff1da08855 all runs: OK false negative chance: 0.000 # git bisect bad 9c39d5ab450f7181775957000f4aff33bfef9f7b Bisecting: 48800 revisions left to test after this (roughly 16 steps) [2d412262ccfd100218412b4b52d92d6a7bb043a4] Merge tag 'hardening-v6.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit 2d412262ccfd100218412b4b52d92d6a7bb043a4 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: fb4d6aab8a04197ac6c74da3ee53c79581cea7904a68cfaad37c584641692153 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good 2d412262ccfd100218412b4b52d92d6a7bb043a4 Bisecting: 24374 revisions left to test after this (roughly 15 steps) [3d51520954154a476bfdacf9427acd1d9538734c] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit 3d51520954154a476bfdacf9427acd1d9538734c gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: ce0b09032f6e800a582699317de8cbbf26880228fb7b55de7cb4a89d69046b59 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good 3d51520954154a476bfdacf9427acd1d9538734c Bisecting: 12331 revisions left to test after this (roughly 14 steps) [176000734ee2978121fde22a954eb1eabb204329] Merge tag 'ata-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit 176000734ee2978121fde22a954eb1eabb204329 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: b415851184985efda17526cf0eeec79e73dacfee1240df42f343e0f27470ff46 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good 176000734ee2978121fde22a954eb1eabb204329 Bisecting: 6116 revisions left to test after this (roughly 13 steps) [3efc57369a0ce8f76bf0804f7e673982384e4ac9] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm determine whether the revision contains the guilty commit revision 3d51520954154a476bfdacf9427acd1d9538734c crashed and is reachable testing commit 3efc57369a0ce8f76bf0804f7e673982384e4ac9 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 9084f294a19239c1606d18b76bd81ba32e49c7ce719fe124a3c52e0c31418f79 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good 3efc57369a0ce8f76bf0804f7e673982384e4ac9 Bisecting: 3097 revisions left to test after this (roughly 12 steps) [3d1b536c13f7cd966aa660d1730855b26d01c9ae] Merge tag 'ata-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux determine whether the revision contains the guilty commit revision 176000734ee2978121fde22a954eb1eabb204329 crashed and is reachable testing commit 3d1b536c13f7cd966aa660d1730855b26d01c9ae gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 46a913150c34d7b38869187691d26fabed9fe3a1839c653e334c6a94ec2ae6f8 all runs: OK false negative chance: 0.000 # git bisect bad 3d1b536c13f7cd966aa660d1730855b26d01c9ae Bisecting: 1497 revisions left to test after this (roughly 11 steps) [d44cd8226449114780a8554fd253c7e3d171a0a6] Merge tag 'net-6.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net determine whether the revision contains the guilty commit revision 176000734ee2978121fde22a954eb1eabb204329 crashed and is reachable testing commit d44cd8226449114780a8554fd253c7e3d171a0a6 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: bd7993a18bdf84748c4ea645d0a3d2d75cca4e348e36caa701d42e06309aeccc all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good d44cd8226449114780a8554fd253c7e3d171a0a6 Bisecting: 748 revisions left to test after this (roughly 10 steps) [5b366eae71937ae7412365340b431064625f9617] stmmac: dwmac-intel-plat: fix call balance of tx_clk handling routines determine whether the revision contains the guilty commit revision 3efc57369a0ce8f76bf0804f7e673982384e4ac9 crashed and is reachable testing commit 5b366eae71937ae7412365340b431064625f9617 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: d68d075ec034b57a84e41c71b439a66beb2f981befeebe6c5ba217419813a38d all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good 5b366eae71937ae7412365340b431064625f9617 Bisecting: 377 revisions left to test after this (roughly 9 steps) [4eb98b7760e8078dbc984ee08b02b5b4c3cff088] Merge tag 'vfs-6.13.mount.api' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs determine whether the revision contains the guilty commit revision d44cd8226449114780a8554fd253c7e3d171a0a6 crashed and is reachable testing commit 4eb98b7760e8078dbc984ee08b02b5b4c3cff088 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 42673953b0d2b627b87ee5d28410316fb3a2654d2a8bdbb434af2c4c8d0f1292 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good 4eb98b7760e8078dbc984ee08b02b5b4c3cff088 Bisecting: 190 revisions left to test after this (roughly 8 steps) [82339c49119f5e38ca3c81d698b84134c342373f] Merge tag 'pull-xattr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit 82339c49119f5e38ca3c81d698b84134c342373f gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 63bed64a3bbd3e9ae70000b01e97b6e6fb799b9758d9cb01d4dc8d71a82886cf all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good 82339c49119f5e38ca3c81d698b84134c342373f Bisecting: 95 revisions left to test after this (roughly 7 steps) [64a71f0b8a37145a387029bd8ad35b7aa864add8] btrfs: assert delayed refs lock is held at find_first_ref_head() determine whether the revision contains the guilty commit revision 176000734ee2978121fde22a954eb1eabb204329 crashed and is reachable testing commit 64a71f0b8a37145a387029bd8ad35b7aa864add8 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 04703c344e2a0b779f587990c6b041b5c66c95376505e0d5a7100b9136db8121 all runs: OK false negative chance: 0.000 # git bisect bad 64a71f0b8a37145a387029bd8ad35b7aa864add8 Bisecting: 47 revisions left to test after this (roughly 6 steps) [fd68c60048ee3cd182da1c1c89e663214f4c22ba] btrfs: drop unused parameter argp from btrfs_ioctl_quota_rescan_wait() determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit fd68c60048ee3cd182da1c1c89e663214f4c22ba gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 51efd7014879e96dc2ea0ad6bc06c9bb7ecba0ee21ff8417451518c195e43d94 all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good fd68c60048ee3cd182da1c1c89e663214f4c22ba Bisecting: 23 revisions left to test after this (roughly 5 steps) [8511074c42b6255e03eceb09396338572572f1c7] btrfs: remove unused btrfs_folio_start_writer_lock() determine whether the revision contains the guilty commit revision 176000734ee2978121fde22a954eb1eabb204329 crashed and is reachable testing commit 8511074c42b6255e03eceb09396338572572f1c7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 5af33fbddfa3117a7ef439ee862cc693b10916450d7e14923634bdb6711f318a all runs: OK false negative chance: 0.000 # git bisect bad 8511074c42b6255e03eceb09396338572572f1c7 Bisecting: 11 revisions left to test after this (roughly 4 steps) [a9c50c975656e551ea4bfe0f292b05d0e2a664c5] btrfs: drop unused parameter level from alloc_heuristic_ws() determine whether the revision contains the guilty commit revision 176000734ee2978121fde22a954eb1eabb204329 crashed and is reachable testing commit a9c50c975656e551ea4bfe0f292b05d0e2a664c5 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 25bfab0bd9cc1d5e0f51074ef2b8620f56dec7485825f8da7cae572634e44c7b all runs: crashed: BUG: MAX_LOCK_DEPTH too low! representative crash: BUG: MAX_LOCK_DEPTH too low!, types: [UNKNOWN] # git bisect good a9c50c975656e551ea4bfe0f292b05d0e2a664c5 Bisecting: 5 revisions left to test after this (roughly 3 steps) [a8371fccf016c83e1c3d9fb832ebb60d783d1853] btrfs: re-enable the extent map shrinker determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit a8371fccf016c83e1c3d9fb832ebb60d783d1853 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: d7cf0940828c48f7cbe539d47651a021cea5b32f7e0462b656e68b1f6e607a7c all runs: OK false negative chance: 0.000 # git bisect bad a8371fccf016c83e1c3d9fb832ebb60d783d1853 Bisecting: 2 revisions left to test after this (roughly 2 steps) [1020443840569535f6025a855958f07ea3eebf71] btrfs: make the extent map shrinker run asynchronously as a work queue job determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit 1020443840569535f6025a855958f07ea3eebf71 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 2f289bbe2cfccae54ee0c5d1c107075f78fc3c049a26d29487c56db8a2db7240 all runs: OK false negative chance: 0.000 # git bisect bad 1020443840569535f6025a855958f07ea3eebf71 Bisecting: 0 revisions left to test after this (roughly 1 step) [03ba05058365973a955e1641da908696545703dd] btrfs: add and use helper to remove extent map from its inode's tree determine whether the revision contains the guilty commit revision d44cd8226449114780a8554fd253c7e3d171a0a6 crashed and is reachable testing commit 03ba05058365973a955e1641da908696545703dd gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 955895c0bb2df56083a36b9ecfe1446d94a29e15a38ebf5d860d10cd43c60fb8 all runs: OK false negative chance: 0.000 # git bisect bad 03ba05058365973a955e1641da908696545703dd Bisecting: 0 revisions left to test after this (roughly 0 steps) [99785998ed1cea142e20f4904ced26537a37bf74] btrfs: reduce lock contention when eb cache miss for btree search determine whether the revision contains the guilty commit revision ffc253263a1375a65fa6c9f62a893e9767fbebfa crashed and is reachable testing commit 99785998ed1cea142e20f4904ced26537a37bf74 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 876c8b254dc1c31a1da4fa84a7795e150a027cf63be3d8845b74d3222a572d0f all runs: OK false negative chance: 0.000 # git bisect bad 99785998ed1cea142e20f4904ced26537a37bf74 99785998ed1cea142e20f4904ced26537a37bf74 is the first bad commit commit 99785998ed1cea142e20f4904ced26537a37bf74 Author: Robbie Ko Date: Tue Oct 15 15:41:37 2024 +0800 btrfs: reduce lock contention when eb cache miss for btree search When crawling btree, if an eb cache miss occurs, we change to use the eb read lock and release all previous locks (including the parent lock) to reduce lock contention. If an eb cache miss occurs in a leaf and needs to execute IO, before this change we released locks only from level 2 and up and we read a leaf's content from disk while holding a lock on its parent (level 1), causing the unnecessary lock contention on the parent, after this change we release locks from level 1 and up, but we lock level 0, and read leaf's content from disk. Because we have prepared the check parameters and the read lock of eb we hold, we can ensure that no race will occur during the check and cause unexpected errors. Reviewed-by: Filipe Manana Signed-off-by: Robbie Ko Signed-off-by: David Sterba fs/btrfs/ctree.c | 101 ++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 70 insertions(+), 31 deletions(-) accumulated error probability: 0.00 culprit signature: 876c8b254dc1c31a1da4fa84a7795e150a027cf63be3d8845b74d3222a572d0f parent signature: 25bfab0bd9cc1d5e0f51074ef2b8620f56dec7485825f8da7cae572634e44c7b revisions tested: 27, total time: 7h18m44.795284898s (build: 3h43m47.830164369s, test: 3h14m8.510952267s) first good commit: 99785998ed1cea142e20f4904ced26537a37bf74 btrfs: reduce lock contention when eb cache miss for btree search recipients (to): ["dsterba@suse.com" "fdmanana@suse.com" "robbieko@synology.com"] recipients (cc): []