ci starts bisection 2025-10-28 05:08:31.572810214 +0000 UTC m=+47554.363951459 bisecting fixing commit since 759dfc7d04bab1b0b86113f1164dc1fec192b859 building syzkaller on 0c075d67fcfde8d048cca2f751a82db97ebc3754 ensuring issue is reproducible on original commit 759dfc7d04bab1b0b86113f1164dc1fec192b859 testing commit 759dfc7d04bab1b0b86113f1164dc1fec192b859 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: f7664aa98c5d6690d231d4f918f3577662883ca31e87d1c9c353f662187701bc all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed testing commit 759dfc7d04bab1b0b86113f1164dc1fec192b859 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 0c3fa4dba5b9a8981a57f4ccd39fbeaad06114985e6f84b5a9b799edcd2eea23 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [ubsan bug_or_warning kasan atomic_sleep hang memleak], they are not needed kconfig minimization: base=4116 full=8484 leaves diff=2170 split chunks (needed=false): <2170> split chunk #0 of len 2170 into 5 parts testing without sub-chunk 1/5 disabling configs for [ubsan bug_or_warning kasan atomic_sleep hang memleak], they are not needed testing commit 759dfc7d04bab1b0b86113f1164dc1fec192b859 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: ea1d1a7a5458d6daaca70d28d3143f29ddc907be91aa2d6ee24a73f74fa6172e 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], they are not needed testing commit 759dfc7d04bab1b0b86113f1164dc1fec192b859 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 403a5c23b0ce43b6cb84155ba180459e6d252f300487c68e233426faae769d6e run #0: crashed: possible deadlock in kernfs_remove run #1: crashed: possible deadlock in kernfs_remove run #2: crashed: possible deadlock in kernfs_remove run #3: crashed: possible deadlock in kernfs_remove run #4: crashed: possible deadlock in kernfs_remove run #5: crashed: possible deadlock in kernfs_remove run #6: crashed: possible deadlock in elevator_change run #7: crashed: possible deadlock in elevator_change run #8: crashed: possible deadlock in kernfs_remove run #9: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 759dfc7d04bab1b0b86113f1164dc1fec192b859 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: bf8cb3955ec5d9b6f74d7268e632f0950654c64c7bd79fa2b260eb97e66fbaf9 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 759dfc7d04bab1b0b86113f1164dc1fec192b859 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 8012f81ebb990b5cebcbc0f9a378d1b95b88d3f5cec332b6cd941015a2d505c0 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed testing commit 759dfc7d04bab1b0b86113f1164dc1fec192b859 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 6b0896579ef20f378db4ffc1098388247cfb213e1e7a80674081478a69539e84 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] the chunk can be dropped minimized to 434 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_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_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 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 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] disabling configs for [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed testing current HEAD 210b35d6a7ea415494ce75490c4b43b4e717d935 testing commit 210b35d6a7ea415494ce75490c4b43b4e717d935 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: ac24da60316dcc819a02d6394b7b5349370f698779935c6b87889c9e2ee49030 all runs: OK false negative chance: 0.000 # git bisect start 210b35d6a7ea415494ce75490c4b43b4e717d935 759dfc7d04bab1b0b86113f1164dc1fec192b859 Bisecting: 10597 revisions left to test after this (roughly 13 steps) [dea00c204e7e99aca9a4cb8603174c4cd0051728] tools: lib: thermal: expose thermal_exit symbols determine whether the revision contains the guilty commit revision 759dfc7d04bab1b0b86113f1164dc1fec192b859 crashed and is reachable testing commit dea00c204e7e99aca9a4cb8603174c4cd0051728 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 95c5c64e249fbcaa09ff4bc98514312e915e7342c21e72e409f31ed329ef050e all runs: OK false negative chance: 0.000 # git bisect bad dea00c204e7e99aca9a4cb8603174c4cd0051728 Bisecting: 5294 revisions left to test after this (roughly 12 steps) [479058002c32b77acac43e883b92174e22c4be2d] Merge tag 'ata-6.17-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux determine whether the revision contains the guilty commit checking the merge base d9104cec3e8fe4b458b74709853231385779001f no existing result, test the revision testing commit d9104cec3e8fe4b458b74709853231385779001f gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: eda441690843317558e0c6f756ceef621fd9f377d9dd9a50f0f957a78810486a all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] testing commit 479058002c32b77acac43e883b92174e22c4be2d gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 509440a9e76fb2f2e0154c07c7a957cf3306e9025d5153e81f7b04094886c902 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] # git bisect good 479058002c32b77acac43e883b92174e22c4be2d Bisecting: 2647 revisions left to test after this (roughly 11 steps) [18b19abc3709b109676ffd1f48dcd332c2e477d4] Merge tag 'namespace-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs determine whether the revision contains the guilty commit revision 759dfc7d04bab1b0b86113f1164dc1fec192b859 crashed and is reachable testing commit 18b19abc3709b109676ffd1f48dcd332c2e477d4 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: bb8aa0a0bb5bf510c21edf44968f31717d4c680384adf363ad872bc787222090 all runs: OK false negative chance: 0.000 # git bisect bad 18b19abc3709b109676ffd1f48dcd332c2e477d4 Bisecting: 1323 revisions left to test after this (roughly 10 steps) [cc282f73bc0cbdf3ee7af2f2d3a2ef4e6b19242d] net/smc: Remove validation of reserved bits in CLC Decline message determine whether the revision contains the guilty commit revision 759dfc7d04bab1b0b86113f1164dc1fec192b859 crashed and is reachable testing commit cc282f73bc0cbdf3ee7af2f2d3a2ef4e6b19242d gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 54ff2155cd7bc0c3edfcef29005c792be1ecf5932e71e4910126a634d9a2539d all runs: OK false negative chance: 0.000 # git bisect bad cc282f73bc0cbdf3ee7af2f2d3a2ef4e6b19242d Bisecting: 660 revisions left to test after this (roughly 9 steps) [074e461d9ed5bbd393a76ae42caa2a5a55add23b] Merge tag 'ext4_for_linus-6.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 determine whether the revision contains the guilty commit revision 479058002c32b77acac43e883b92174e22c4be2d crashed and is reachable testing commit 074e461d9ed5bbd393a76ae42caa2a5a55add23b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 2d3809b36522e3be9183a42730dfbc1b32e45586123168d487394567ae185478 all runs: OK false negative chance: 0.000 # git bisect bad 074e461d9ed5bbd393a76ae42caa2a5a55add23b Bisecting: 324 revisions left to test after this (roughly 8 steps) [b20b8538b310f5458bd7a08b7ff8a76cc3c28d24] Merge tag 'mailbox-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/jassibrar/mailbox determine whether the revision contains the guilty commit revision d9104cec3e8fe4b458b74709853231385779001f crashed and is reachable testing commit b20b8538b310f5458bd7a08b7ff8a76cc3c28d24 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: ce03632588e567549b54f8268124953dbb05a4c6cc515d327bb3e14d3caa1fa1 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] # git bisect good b20b8538b310f5458bd7a08b7ff8a76cc3c28d24 Bisecting: 136 revisions left to test after this (roughly 7 steps) [63467137ecc0ff6f804d53903ad87a2f0397a18b] Merge tag 'net-6.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net determine whether the revision contains the guilty commit revision b20b8538b310f5458bd7a08b7ff8a76cc3c28d24 crashed and is reachable testing commit 63467137ecc0ff6f804d53903ad87a2f0397a18b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 6a7a553533d632d17f52a64229a410def3696722346f78f3c2ba935b132190a9 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] # git bisect good 63467137ecc0ff6f804d53903ad87a2f0397a18b Bisecting: 64 revisions left to test after this (roughly 6 steps) [d0efc9e4276cda07c2f76652d240b165c30b05b8] Merge tag 'xfs-fixes-6.17-rc2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux determine whether the revision contains the guilty commit revision d9104cec3e8fe4b458b74709853231385779001f crashed and is reachable testing commit d0efc9e4276cda07c2f76652d240b165c30b05b8 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 08c2901300776d4cfac4d8a6f202cd4b102341cb55438a50e0ed1add25af6e7a all runs: OK false negative chance: 0.000 # git bisect bad d0efc9e4276cda07c2f76652d240b165c30b05b8 Bisecting: 42 revisions left to test after this (roughly 5 steps) [7bb7780e3c845009d37f61e3a8a29c0f962a4806] Merge tag 'gpio-fixes-for-v6.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux determine whether the revision contains the guilty commit revision b20b8538b310f5458bd7a08b7ff8a76cc3c28d24 crashed and is reachable testing commit 7bb7780e3c845009d37f61e3a8a29c0f962a4806 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 5bfa42c1aea8fe15429566e35472be87328ca3318c979acd4b577a031b1a2c32 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] # git bisect good 7bb7780e3c845009d37f61e3a8a29c0f962a4806 Bisecting: 20 revisions left to test after this (roughly 5 steps) [4ad976b0e8ea3247c607cd37abb09440806f898d] Merge tag 'io_uring-6.17-20250815' of git://git.kernel.dk/linux determine whether the revision contains the guilty commit revision 7bb7780e3c845009d37f61e3a8a29c0f962a4806 crashed and is reachable testing commit 4ad976b0e8ea3247c607cd37abb09440806f898d gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: d25bc2fb81fb7628ecf21c343f105a2c3b19e41632412ce58311079dc57a23a5 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] # git bisect good 4ad976b0e8ea3247c607cd37abb09440806f898d Bisecting: 10 revisions left to test after this (roughly 3 steps) [f7a2e1c08727384cde1c686dd57172f99b5f2e6e] Docs: admin-guide: Correct spelling mistake determine whether the revision contains the guilty commit revision 759dfc7d04bab1b0b86113f1164dc1fec192b859 crashed and is reachable testing commit f7a2e1c08727384cde1c686dd57172f99b5f2e6e gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: c79b9357bfa3041a7bbbaa8c76ee8f33a691cdebc8872d263a5b7dc26164025f all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] # git bisect good f7a2e1c08727384cde1c686dd57172f99b5f2e6e Bisecting: 5 revisions left to test after this (roughly 3 steps) [68456d05eb57a5d16b4be2d3caf421bdcf2de72e] xfs: disallow atomic writes on DAX determine whether the revision contains the guilty commit revision b20b8538b310f5458bd7a08b7ff8a76cc3c28d24 crashed and is reachable testing commit 68456d05eb57a5d16b4be2d3caf421bdcf2de72e gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: b65856b264cb4024808701fef897150e282c492e092498f5eaf81384db6438cb all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] # git bisect good 68456d05eb57a5d16b4be2d3caf421bdcf2de72e Bisecting: 2 revisions left to test after this (roughly 2 steps) [f76823e3b284aae30797fded988a807eab2da246] xfs: split xfs_zone_record_blocks determine whether the revision contains the guilty commit revision b20b8538b310f5458bd7a08b7ff8a76cc3c28d24 crashed and is reachable testing commit f76823e3b284aae30797fded988a807eab2da246 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 9883d5b4b42aee211e13807e520028b1ff9f439e7f5f88be76a0407318d87473 all runs: crashed: possible deadlock in kernfs_remove representative crash: possible deadlock in kernfs_remove, types: [LOCKDEP] # git bisect good f76823e3b284aae30797fded988a807eab2da246 Bisecting: 0 revisions left to test after this (roughly 1 step) [ee94b00c1a648530333d9734200be7a45e6e00cd] Merge tag 'block-6.17-20250815' of git://git.kernel.dk/linux determine whether the revision contains the guilty commit revision b20b8538b310f5458bd7a08b7ff8a76cc3c28d24 crashed and is reachable testing commit ee94b00c1a648530333d9734200be7a45e6e00cd gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 9cdd7da3aeb66c4b8537edb35b578182ecb1b6a7b21e89ca20071dad49b10fcc all runs: OK false negative chance: 0.000 # git bisect bad ee94b00c1a648530333d9734200be7a45e6e00cd Bisecting: 0 revisions left to test after this (roughly 0 steps) [8f5845e0743bf3512b71b3cb8afe06c192d6acc4] block: restore default wbt enablement determine whether the revision contains the guilty commit revision f7a2e1c08727384cde1c686dd57172f99b5f2e6e crashed and is reachable testing commit 8f5845e0743bf3512b71b3cb8afe06c192d6acc4 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 6ee8b4e613bdff03899d444eae907d1b6f14e57b6ee41377de24cebc32021337 all runs: OK false negative chance: 0.000 # git bisect bad 8f5845e0743bf3512b71b3cb8afe06c192d6acc4 8f5845e0743bf3512b71b3cb8afe06c192d6acc4 is the first bad commit commit 8f5845e0743bf3512b71b3cb8afe06c192d6acc4 Author: Julian Sun Date: Tue Aug 12 23:42:57 2025 +0800 block: restore default wbt enablement The commit 245618f8e45f ("block: protect wbt_lat_usec using q->elevator_lock") protected wbt_enable_default() with q->elevator_lock; however, it also placed wbt_enable_default() before blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);, resulting in wbt failing to be enabled. Moreover, the protection of wbt_enable_default() by q->elevator_lock was removed in commit 78c271344b6f ("block: move wbt_enable_default() out of queue freezing from sched ->exit()"), so we can directly fix this issue by placing wbt_enable_default() after blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);. Additionally, this issue also causes the inability to read the wbt_lat_usec file, and the scenario is as follows: root@q:/sys/block/sda/queue# cat wbt_lat_usec cat: wbt_lat_usec: Invalid argument root@q:/data00/sjc/linux# ls /sys/kernel/debug/block/sda/rqos cannot access '/sys/kernel/debug/block/sda/rqos': No such file or directory root@q:/data00/sjc/linux# find /sys -name wbt /sys/kernel/debug/tracing/events/wbt After testing with this patch, wbt can be enabled normally. Signed-off-by: Julian Sun Cc: stable@vger.kernel.org Fixes: 245618f8e45f ("block: protect wbt_lat_usec using q->elevator_lock") Reviewed-by: Nilay Shroff Reviewed-by: Yu Kuai Reviewed-by: Ming Lei Link: https://lore.kernel.org/r/20250812154257.57540-1-sunjunchao@bytedance.com Signed-off-by: Jens Axboe block/blk-sysfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) accumulated error probability: 0.00 culprit signature: 6ee8b4e613bdff03899d444eae907d1b6f14e57b6ee41377de24cebc32021337 parent signature: c79b9357bfa3041a7bbbaa8c76ee8f33a691cdebc8872d263a5b7dc26164025f revisions tested: 24, total time: 9h55m8.091614523s (build: 5h44m4.261702384s, test: 2h37m53.72675774s) first good commit: 8f5845e0743bf3512b71b3cb8afe06c192d6acc4 block: restore default wbt enablement recipients (to): ["axboe@kernel.dk" "ming.lei@redhat.com" "nilay@linux.ibm.com" "sunjunchao2870@gmail.com" "sunjunchao@bytedance.com" "yukuai3@huawei.com"] recipients (cc): []