ci starts bisection 2025-06-02 06:11:20.047811429 +0000 UTC m=+398278.244812234 bisecting cause commit starting from 3a83b350b5be4b4f6bd895eecf9a92080200ee5d building syzkaller on 3d2f584ddab119da50e8a8d26765aa98d3b33c02 ensuring issue is reproducible on original commit 3a83b350b5be4b4f6bd895eecf9a92080200ee5d testing commit 3a83b350b5be4b4f6bd895eecf9a92080200ee5d gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: d4a3787641d6f3750ecc7c9a6eb9fb8ad70c602a1e0b92752fe89d0524eb38b0 run #0: crashed: possible deadlock in console_flush_all run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in console_flush_all run #5: crashed: possible deadlock in console_flush_all run #6: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #7: crashed: possible deadlock in console_flush_all run #8: crashed: possible deadlock in console_flush_all run #9: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #10: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #11: crashed: possible deadlock in console_flush_all run #12: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #13: crashed: possible deadlock in console_flush_all run #14: crashed: possible deadlock in console_flush_all run #15: crashed: possible deadlock in console_flush_all run #16: crashed: possible deadlock in console_flush_all run #17: crashed: possible deadlock in console_flush_all run #18: crashed: possible deadlock in console_flush_all run #19: crashed: possible deadlock in console_flush_all representative crash: possible deadlock in console_flush_all, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit 3a83b350b5be4b4f6bd895eecf9a92080200ee5d gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 49f934d1233322450f74452e61dd340cd9eaae0da6b4a38223f739f21f367e28 run #0: crashed: possible deadlock in console_flush_all run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in console_flush_all run #5: crashed: possible deadlock in console_flush_all run #6: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #7: crashed: possible deadlock in console_flush_all run #8: crashed: possible deadlock in console_flush_all run #9: crashed: possible deadlock in console_flush_all representative crash: possible deadlock in console_flush_all, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed kconfig minimization: base=4091 full=8365 leaves diff=2131 split chunks (needed=false): <2131> split chunk #0 of len 2131 into 5 parts testing without sub-chunk 1/5 disabling configs for [LEAK UBSAN BUG KASAN ATOMIC_SLEEP HANG], they are not needed testing commit 3a83b350b5be4b4f6bd895eecf9a92080200ee5d gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: c8b914c3932abce308d4803e6ef77d51803a5349d23523962328f881bdd7cf34 all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit 3a83b350b5be4b4f6bd895eecf9a92080200ee5d gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: ef5bc30bdd2c58bb86b0fe7bc1406c706881c55f260b376dd2216fc4d1e3dfea all runs: crashed: possible deadlock in console_flush_all representative crash: possible deadlock in console_flush_all, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit 3a83b350b5be4b4f6bd895eecf9a92080200ee5d gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: fdfa368a0746fa5115a9043201ca52504c2b12b88a6d960225e4fde93a4a55e7 run #0: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #4: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #5: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #6: crashed: possible deadlock in console_flush_all run #7: crashed: possible deadlock in console_flush_all run #8: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #9: crashed: possible deadlock in console_flush_all representative crash: possible deadlock in start_poll_synchronize_rcu_expedited, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit 3a83b350b5be4b4f6bd895eecf9a92080200ee5d gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 04337f2b46f62a293ea0899b8a456ad4a007c1553a62f4f36cdac643574ffc42 run #0: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #1: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #2: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #5: crashed: possible deadlock in console_flush_all run #6: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #7: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #8: crashed: possible deadlock in console_flush_all run #9: crashed: possible deadlock in start_poll_synchronize_rcu_expedited representative crash: possible deadlock in start_poll_synchronize_rcu_expedited, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit 3a83b350b5be4b4f6bd895eecf9a92080200ee5d gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 162662effd1f2a6a57f6ad01dfddbb87a450b823c2040b129cbd22ed4becca88 run #0: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #5: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #6: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #7: crashed: possible deadlock in console_flush_all run #8: crashed: possible deadlock in console_flush_all run #9: crashed: possible deadlock in console_flush_all representative crash: possible deadlock in start_poll_synchronize_rcu_expedited, types: [LOCKDEP] the chunk can be dropped minimized to 427 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_MRRM 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_MEMORY_HOTREMOVE ARCH_ENABLE_THP_MIGRATION ARCH_HAS_USER_SHADOW_STACK 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 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_DEV_ZONED 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_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_NF_EBTABLES_LEGACY 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 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 CLOSURES CLS_U32_MARK CLS_U32_PERF CMA CMA_SIZE_SEL_MAX 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 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_ARCH_HAVE_LIB_SHA256 CRYPTO_ARCH_HAVE_LIB_SHA256_SIMD 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_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_SHA256_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_SHA1_SSSE3 CRYPTO_SHA256_X86_64 CRYPTO_SHA512_SSSE3 CRYPTO_SM3_AVX_X86_64 CRYPTO_SM4 CRYPTO_SM4_AESNI_AVX2_X86_64 CRYPTO_SM4_AESNI_AVX_X86_64 CRYPTO_SM4_GENERIC CRYPTO_STREEBOG CRYPTO_TEA CRYPTO_TWOFISH CRYPTO_TWOFISH_AVX_X86_64 CRYPTO_TWOFISH_COMMON CRYPTO_TWOFISH_X86_64 CRYPTO_TWOFISH_X86_64_3WAY CRYPTO_USER CRYPTO_USER_API CRYPTO_USER_API_AEAD CRYPTO_USER_API_ENABLE_OBSOLETE CRYPTO_USER_API_HASH CRYPTO_USER_API_RNG CRYPTO_USER_API_SKCIPHER CRYPTO_WP512 CRYPTO_XCBC CRYPTO_XCTR CRYPTO_XTS CRYPTO_XXHASH CRYPTO_ZSTD CUSE CYPRESS_FIRMWARE DAMON DAMON_PADDR DAMON_RECLAIM DAMON_VADDR DAX DCA DCB DEBUG_VFS DEFAULT_CODEL DEVICE_MIGRATION DEVICE_PRIVATE DEV_COREDUMP DEV_DAX DLN2_ADC DMABUF_HEAPS DMABUF_HEAPS_CMA DMABUF_HEAPS_SYSTEM DMABUF_MOVE_NOTIFY DMA_CMA DMA_ENGINE_RAID DM_AUDIT 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_AUX_BRIDGE DRM_BOCHS DRM_BRIDGE DRM_BUDDY DRM_CIRRUS_QEMU DRM_CLIENT DRM_CLIENT_DEFAULT_FBDEV DRM_CLIENT_LIB DRM_CLIENT_SELECTION DRM_CLIENT_SETUP DRM_DEBUG_MM DRM_DISPLAY_DP_AUX_BUS DRM_DISPLAY_DP_HELPER DRM_DISPLAY_HELPER DRM_FBDEV_EMULATION ENCRYPTED_KEYS FSCACHE FUSE_FS GPIOLIB HAMRADIO HID_DRAGONRISE IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ LIBNVDIMM MAC80211 MAC80211_DEBUGFS MAC80211_LEDS MEDIA_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MMC MTD NET_CLS_U32 NET_SCH_DEFAULT PARTITION_ADVANCED RFKILL SERIAL_DEV_BUS TLS TLS_DEVICE TRANSPARENT_HUGEPAGE TRUSTED_KEYS USB_GADGET USB_PHY VLAN_8021Q WANT_COMPAT_NETLINK_MESSAGES WEXT_CORE WIRELESS WLAN WLAN_VENDOR_ATH ZONE_DEVICE] disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed picked [v6.15 v6.14 v6.13 v6.11 v6.9 v6.7 v6.5 v6.3 v6.0 v5.17 v5.14 v5.11 v5.8 v5.5 v5.2 v4.20 v4.19] out of 38 release tags testing release v6.15 testing commit 0ff41df1cb268fc69e703a08a57ee14ae967d0ca gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 060fb70393bd7d166172c3ae0f6774e097a7aa87454f55af81afdeac02a711d5 all runs: OK false negative chance: 0.000 # git bisect start 3a83b350b5be4b4f6bd895eecf9a92080200ee5d 0ff41df1cb268fc69e703a08a57ee14ae967d0ca Bisecting: 6372 revisions left to test after this (roughly 13 steps) [1b98f357dadd6ea613a435fbaef1a5dd7b35fd21] Merge tag 'net-next-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next testing commit 1b98f357dadd6ea613a435fbaef1a5dd7b35fd21 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: a0a815a3605fd81f9165c9839a43c46164109a08c511f898eb1a13f92fcfaee5 run #0: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in console_flush_all run #5: crashed: possible deadlock in console_flush_all run #6: crashed: possible deadlock in console_flush_all run #7: crashed: possible deadlock in console_flush_all run #8: crashed: possible deadlock in console_flush_all run #9: crashed: possible deadlock in console_flush_all representative crash: possible deadlock in start_poll_synchronize_rcu_expedited, types: [LOCKDEP] # git bisect bad 1b98f357dadd6ea613a435fbaef1a5dd7b35fd21 Bisecting: 3652 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 testing commit a61e26038143727d9b0f1bc01b0370f77f2ad7e4 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: f348f1ac01566f838bbd2b2aebb4cf23d16ff317db1123d6e66c794e09556dea run #0: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #5: crashed: possible deadlock in console_flush_all run #6: crashed: possible deadlock in console_flush_all run #7: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #8: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #9: crashed: possible deadlock in start_poll_synchronize_rcu_expedited representative crash: possible deadlock in start_poll_synchronize_rcu_expedited, types: [LOCKDEP] # git bisect bad a61e26038143727d9b0f1bc01b0370f77f2ad7e4 Bisecting: 1981 revisions left to test after this (roughly 11 steps) [0c1494015fea0935fbf6cd9d99c008fcbe1e4165] Merge tag 'core-entry-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit 0c1494015fea0935fbf6cd9d99c008fcbe1e4165 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 7eed99ec1a1b1509dd6922cc541373ccc3bc044d0663109438052e64e8a4ce3e run #0: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #1: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #5: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #6: crashed: possible deadlock in console_flush_all run #7: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #8: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #9: crashed: possible deadlock in console_flush_all representative crash: possible deadlock in start_poll_synchronize_rcu_expedited, types: [LOCKDEP] # git bisect bad 0c1494015fea0935fbf6cd9d99c008fcbe1e4165 Bisecting: 1061 revisions left to test after this (roughly 10 steps) [15d90a5e5524532b7456a24f4626cf28c1629c4c] Merge tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux testing commit 15d90a5e5524532b7456a24f4626cf28c1629c4c gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 066c6bd2310b3e79183b10a26b75336ac54a81ceab4c2d4cb6b3cf25fcb5b785 run #0: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #4: crashed: possible deadlock in console_flush_all run #5: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #6: crashed: possible deadlock in console_flush_all run #7: crashed: possible deadlock in console_flush_all run #8: crashed: possible deadlock in console_flush_all run #9: crashed: possible deadlock in start_poll_synchronize_rcu_expedited representative crash: possible deadlock in start_poll_synchronize_rcu_expedited, types: [LOCKDEP] # git bisect bad 15d90a5e5524532b7456a24f4626cf28c1629c4c Bisecting: 507 revisions left to test after this (roughly 9 steps) [49fffac983ac52aea0ab94914be3f56bcf92d5dc] Merge tag 'for-6.16/io_uring-20250523' of git://git.kernel.dk/linux testing commit 49fffac983ac52aea0ab94914be3f56bcf92d5dc gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 0b98fd66b90564268fb27e944d773c4f5edc2debd00183ef5ad85bea7e11d94c all runs: OK false negative chance: 0.000 # git bisect good 49fffac983ac52aea0ab94914be3f56bcf92d5dc Bisecting: 276 revisions left to test after this (roughly 8 steps) [8fdabcd9c01d9ac585d8109a921e0734a69479fb] Merge tag 'gfs2-for-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2 testing commit 8fdabcd9c01d9ac585d8109a921e0734a69479fb gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: de660b4f04391cc3193011714f5b5b772c9aa757139426320559ecc793843cfd all runs: OK false negative chance: 0.000 # git bisect good 8fdabcd9c01d9ac585d8109a921e0734a69479fb Bisecting: 138 revisions left to test after this (roughly 7 steps) [3b7b0c3996b570f9c305c6f3df475a719920d65c] bcachefs: print label correctly in sb_member_to_text() testing commit 3b7b0c3996b570f9c305c6f3df475a719920d65c gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 01b91c65ff6c6395dd90c1beb43f4a42deed29b4948c34ae0f468ac2728fe913 run #0: crashed: possible deadlock in console_flush_all run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in console_flush_all run #5: crashed: possible deadlock in console_flush_all run #6: crashed: possible deadlock in console_flush_all run #7: crashed: possible deadlock in console_flush_all run #8: crashed: possible deadlock in console_flush_all run #9: crashed: possible deadlock in start_poll_synchronize_rcu_expedited representative crash: possible deadlock in console_flush_all, types: [LOCKDEP] # git bisect bad 3b7b0c3996b570f9c305c6f3df475a719920d65c Bisecting: 68 revisions left to test after this (roughly 6 steps) [09279bba72f809eeb1f02d39a462e8e1d06fa32a] bcachefs: Kill dead code testing commit 09279bba72f809eeb1f02d39a462e8e1d06fa32a gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 7bc58c3e9e12a23f1a1e36904d539518281c642cd4d3438d74b45034e52cf939 all runs: OK false negative chance: 0.000 # git bisect good 09279bba72f809eeb1f02d39a462e8e1d06fa32a Bisecting: 34 revisions left to test after this (roughly 5 steps) [8a6b883e78bfed6909e21c2afb6138b603d1ee6c] bcachefs: Fix setting ca->name in device add testing commit 8a6b883e78bfed6909e21c2afb6138b603d1ee6c gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: e293ceeefe191db4bbe13cbfbfeab1acfdf91beea617ad3722eafcb438f4c748 all runs: OK false negative chance: 0.000 # git bisect good 8a6b883e78bfed6909e21c2afb6138b603d1ee6c Bisecting: 17 revisions left to test after this (roughly 4 steps) [7d4f2687ef8a625742c5df4e2d42f50ba398f3a2] bcachefs: bch2_journal_write() refactoring testing commit 7d4f2687ef8a625742c5df4e2d42f50ba398f3a2 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 8a0732611cb83b895f4712faaaf173c6d0045120a434e4704fbaf2fdfabf9431 all runs: OK false negative chance: 0.000 # git bisect good 7d4f2687ef8a625742c5df4e2d42f50ba398f3a2 Bisecting: 8 revisions left to test after this (roughly 3 steps) [09fa6c3039d8bb22351ad071ea4656dd4f331d18] bcachefs: bch2_dev_data_drop_by_backpointers() testing commit 09fa6c3039d8bb22351ad071ea4656dd4f331d18 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 51143e827a5655e670eb715dfb518cdc159652a236521854a3882cdc09471cd8 all runs: OK false negative chance: 0.000 # git bisect good 09fa6c3039d8bb22351ad071ea4656dd4f331d18 Bisecting: 4 revisions left to test after this (roughly 2 steps) [1dfa01ef24151547a2a622e90ad73b082b1bc739] bcachefs: bch2_copygc_dev_wait_amount() testing commit 1dfa01ef24151547a2a622e90ad73b082b1bc739 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 9c646dd62b5020f03ae6c8b51c101f3ddb947f166498980a26417628d46346ec all runs: OK false negative chance: 0.000 # git bisect good 1dfa01ef24151547a2a622e90ad73b082b1bc739 Bisecting: 2 revisions left to test after this (roughly 1 step) [3ffda8c219d636012cfc2b5dae0bf19d831a53e0] bcachefs: kill dead code in move_data_phys() testing commit 3ffda8c219d636012cfc2b5dae0bf19d831a53e0 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 049cd8e65547069d521529028f5a9123d7c88b31e387ab69d695fdebd4413893 run #0: crashed: possible deadlock in console_flush_all run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in console_flush_all run #3: crashed: possible deadlock in console_flush_all run #4: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #5: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #6: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #7: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #8: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #9: crashed: possible deadlock in start_poll_synchronize_rcu_expedited representative crash: possible deadlock in console_flush_all, types: [LOCKDEP] # git bisect bad 3ffda8c219d636012cfc2b5dae0bf19d831a53e0 Bisecting: 0 revisions left to test after this (roughly 0 steps) [82067c916994dd1bfec65496144dc16e17899e36] bcachefs: buckets_in_flight on stack testing commit 82067c916994dd1bfec65496144dc16e17899e36 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 726436d0ac1a3a1e6e2a06a418d27944abcb6edfcdcd1974ce1aff0199387c62 run #0: crashed: possible deadlock in console_flush_all run #1: crashed: possible deadlock in console_flush_all run #2: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #3: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #4: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #5: crashed: possible deadlock in console_flush_all run #6: crashed: possible deadlock in console_flush_all run #7: crashed: possible deadlock in console_flush_all run #8: crashed: possible deadlock in start_poll_synchronize_rcu_expedited run #9: crashed: possible deadlock in start_poll_synchronize_rcu_expedited representative crash: possible deadlock in console_flush_all, types: [LOCKDEP] # git bisect bad 82067c916994dd1bfec65496144dc16e17899e36 82067c916994dd1bfec65496144dc16e17899e36 is the first bad commit commit 82067c916994dd1bfec65496144dc16e17899e36 Author: Kent Overstreet Date: Thu May 8 23:21:28 2025 -0400 bcachefs: buckets_in_flight on stack copygc runs with a full stack available, there's no reason to dynamically allocate this. Signed-off-by: Kent Overstreet fs/bcachefs/movinggc.c | 28 ++++++++++------------------ 1 file changed, 10 insertions(+), 18 deletions(-) accumulated error probability: 0.00 culprit signature: 726436d0ac1a3a1e6e2a06a418d27944abcb6edfcdcd1974ce1aff0199387c62 parent signature: 9c646dd62b5020f03ae6c8b51c101f3ddb947f166498980a26417628d46346ec revisions tested: 22, total time: 6h49m50.614015595s (build: 4h4m37.708490086s, test: 2h10m46.752942653s) first bad commit: 82067c916994dd1bfec65496144dc16e17899e36 bcachefs: buckets_in_flight on stack recipients (to): ["kent.overstreet@linux.dev" "kent.overstreet@linux.dev" "linux-bcachefs@vger.kernel.org"] recipients (cc): ["linux-kernel@vger.kernel.org"] crash: possible deadlock in console_flush_all ODEBUG: object ffffc900030efb48 is on stack ffffc900030ec000, but NOT annotated. ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc4-syzkaller #0 Not tainted ------------------------------------------------------ bch-copygc/loop/4993 is trying to acquire lock: ffffffff83d83370 (console_owner){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline] ffffffff83d83370 (console_owner){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:346 [inline] ffffffff83d83370 (console_owner){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline] ffffffff83d83370 (console_owner){....}-{0:0}, at: console_flush_all+0xb1/0x4b0 kernel/printk/printk.c:3203 but task is already holding lock: ffffffff8beb7970 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_object_init+0x5b/0x260 lib/debugobjects.c:741 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&obj_hash[i].lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5f/0x90 kernel/locking/spinlock.c:162 debug_object_activate+0x6c/0x2d0 lib/debugobjects.c:818 debug_work_activate kernel/workqueue.c:664 [inline] insert_work kernel/workqueue.c:2180 [inline] __queue_work+0x3df/0x5d0 kernel/workqueue.c:2341 queue_work_on+0xc0/0x110 kernel/workqueue.c:2392 queue_work include/linux/workqueue.h:662 [inline] start_poll_synchronize_rcu_expedited+0x99/0xd0 kernel/rcu/tree_exp.h:1075 rcu_init+0xd7/0xf0 kernel/rcu/tree.c:4846 start_kernel+0x1c3/0x340 init/main.c:990 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513 x86_64_start_kernel+0x61/0x70 arch/x86/kernel/head64.c:494 common_startup_64+0x13e/0x147 -> #3 (&pool->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x24a/0x5d0 kernel/workqueue.c:-1 queue_work_on+0xc0/0x110 kernel/workqueue.c:2392 queue_work include/linux/workqueue.h:662 [inline] rpm_suspend+0x4c2/0x740 drivers/base/power/runtime.c:673 __pm_runtime_idle+0x7e/0x110 drivers/base/power/runtime.c:1112 pm_runtime_put include/linux/pm_runtime.h:466 [inline] __device_attach+0x11c/0x1a0 drivers/base/dd.c:1047 bus_probe_device+0x9e/0x120 drivers/base/bus.c:537 device_add+0x255/0x440 drivers/base/core.c:3692 serial_base_port_add+0xde/0x150 drivers/tty/serial/serial_base_bus.c:179 serial_core_port_device_add drivers/tty/serial/serial_core.c:3342 [inline] serial_core_register_port+0xf5/0x930 drivers/tty/serial/serial_core.c:3381 serial8250_register_8250_port+0x59f/0x6f0 drivers/tty/serial/8250/8250_core.c:822 serial_pnp_probe+0x1cf/0x310 drivers/tty/serial/8250/8250_pnp.c:480 pnp_device_probe+0xcd/0x120 drivers/pnp/driver.c:111 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0xfb/0x3e0 drivers/base/dd.c:657 __driver_probe_device+0x72/0xf0 drivers/base/dd.c:799 driver_probe_device+0x1d/0x1b0 drivers/base/dd.c:829 __driver_attach+0x11b/0x270 drivers/base/dd.c:1215 bus_for_each_dev+0x104/0x150 drivers/base/bus.c:370 bus_add_driver+0x167/0x2b0 drivers/base/bus.c:678 driver_register+0x64/0x110 drivers/base/driver.c:249 serial8250_init+0x6f/0x110 drivers/tty/serial/8250/8250_platform.c:315 do_one_initcall+0xe2/0x370 init/main.c:1257 do_initcall_level+0x8f/0x100 init/main.c:1319 do_initcalls+0x54/0x90 init/main.c:1335 kernel_init_freeable+0x17d/0x1f0 init/main.c:1567 kernel_init+0x15/0x120 init/main.c:1457 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&dev->power.lock){-...}-{3:3}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5f/0x90 kernel/locking/spinlock.c:162 __pm_runtime_resume+0x4a/0x80 drivers/base/power/runtime.c:1179 pm_runtime_get include/linux/pm_runtime.h:414 [inline] __uart_start+0x53/0xe0 drivers/tty/serial/serial_core.c:148 uart_write+0xb9/0x270 drivers/tty/serial/serial_core.c:635 process_output_block drivers/tty/n_tty.c:561 [inline] n_tty_write+0x33f/0x4b0 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1015 [inline] file_tty_write+0x1e0/0x350 drivers/tty/tty_io.c:1090 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x2c0/0x3b0 fs/read_write.c:684 ksys_write+0x74/0xf0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0x180 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&port_lock_key){-.-.}-{3:3}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5f/0x90 kernel/locking/spinlock.c:162 uart_port_lock_irqsave include/linux/serial_core.h:715 [inline] serial8250_console_write+0x7e/0x810 drivers/tty/serial/8250/8250_port.c:3415 console_emit_next_record kernel/printk/printk.c:3138 [inline] console_flush_all+0x31c/0x4b0 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0x65/0x100 kernel/printk/printk.c:3325 vprintk_emit+0x26a/0x420 kernel/printk/printk.c:2450 _printk+0x57/0x80 kernel/printk/printk.c:2475 register_console+0x36f/0x3d0 kernel/printk/printk.c:4125 univ8250_console_init+0x1e/0x40 drivers/tty/serial/8250/8250_core.c:513 console_init+0x6f/0x1a0 kernel/printk/printk.c:4323 start_kernel+0x267/0x340 init/main.c:1034 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513 x86_64_start_kernel+0x61/0x70 arch/x86/kernel/head64.c:494 common_startup_64+0x13e/0x147 -> #0 (console_owner){....}-{0:0}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x12c9/0x20e0 kernel/locking/lockdep.c:5235 lock_acquire+0xe9/0x270 kernel/locking/lockdep.c:5866 console_lock_spinning_enable kernel/printk/printk.c:1924 [inline] console_emit_next_record kernel/printk/printk.c:3132 [inline] console_flush_all+0x2db/0x4b0 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0x65/0x100 kernel/printk/printk.c:3325 vprintk_emit+0x26a/0x420 kernel/printk/printk.c:2450 _printk+0x57/0x80 kernel/printk/printk.c:2475 debug_object_is_on_stack lib/debugobjects.c:-1 [inline] lookup_object_or_alloc lib/debugobjects.c:688 [inline] __debug_object_init+0x1d4/0x260 lib/debugobjects.c:743 rhashtable_init_noprof+0x263/0x2c0 lib/rhashtable.c:1085 bch2_copygc_thread+0x11f/0x550 fs/bcachefs/movinggc.c:360 kthread+0x200/0x230 kernel/kthread.c:464 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 other info that might help us debug this: Chain exists of: console_owner --> &pool->lock --> &obj_hash[i].lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&obj_hash[i].lock); lock(&pool->lock); lock(&obj_hash[i].lock); lock(console_owner); *** DEADLOCK *** 3 locks held by bch-copygc/loop/4993: #0: ffffffff8beb7970 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_object_init+0x5b/0x260 lib/debugobjects.c:741 #1: ffffffff83d83398 (console_lock){+.+.}-{0:0}, at: _printk+0x57/0x80 kernel/printk/printk.c:2475 #2: ffffffff83ca2e50 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline] #2: ffffffff83ca2e50 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:346 [inline] #2: ffffffff83ca2e50 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline] #2: ffffffff83ca2e50 (console_srcu){....}-{0:0}, at: console_flush_all+0xb1/0x4b0 kernel/printk/printk.c:3203 stack backtrace: CPU: 1 UID: 0 PID: 4993 Comm: bch-copygc/loop Not tainted 6.15.0-rc4-syzkaller #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0xad/0x110 lib/dump_stack.c:120 print_circular_bug+0x29b/0x2b0 kernel/locking/lockdep.c:2079 check_noncircular+0x10e/0x130 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x12c9/0x20e0 kernel/locking/lockdep.c:5235 lock_acquire+0xe9/0x270 kernel/locking/lockdep.c:5866 console_lock_spinning_enable kernel/printk/printk.c:1924 [inline] console_emit_next_record kernel/printk/printk.c:3132 [inline] console_flush_all+0x2db/0x4b0 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0x65/0x100 kernel/printk/printk.c:3325 vprintk_emit+0x26a/0x420 kernel/printk/printk.c:2450 _printk+0x57/0x80 kernel/printk/printk.c:2475 debug_object_is_on_stack lib/debugobjects.c:-1 [inline] lookup_object_or_alloc lib/debugobjects.c:688 [inline] __debug_object_init+0x1d4/0x260 lib/debugobjects.c:743 rhashtable_init_noprof+0x263/0x2c0 lib/rhashtable.c:1085 bch2_copygc_thread+0x11f/0x550 fs/bcachefs/movinggc.c:360 kthread+0x200/0x230 kernel/kthread.c:464 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245