ci2 starts bisection 2025-06-20 17:16:43.979491501 +0000 UTC m=+18498.175732558 bisecting cause commit starting from 9afe652958c3ee88f24df1e4a97f298afce89407 building syzkaller on cfebc8873b2f707ef8ed0bb2d8abb0280fede23a ensuring issue is reproducible on original commit 9afe652958c3ee88f24df1e4a97f298afce89407 testing commit 9afe652958c3ee88f24df1e4a97f298afce89407 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: d080a603bf227aab214a0e828709fc4338001b085979ae5b3fac3493162c449f run #0: crashed: INFO: task hung in bch2_page_fault run #1: crashed: INFO: task hung in bch2_page_fault run #2: crashed: INFO: task hung in bch2_page_fault run #3: crashed: INFO: task hung in bch2_page_fault run #4: crashed: INFO: task hung in bch2_page_fault run #5: crashed: INFO: task hung in bch2_readahead run #6: crashed: INFO: task hung in bch2_page_fault run #7: crashed: INFO: task hung in bch2_page_fault run #8: crashed: INFO: task hung in bch2_page_fault run #9: crashed: INFO: task hung in bch2_page_fault run #10: crashed: INFO: task hung in bch2_page_fault run #11: crashed: INFO: task hung in bch2_page_fault run #12: crashed: INFO: task hung in bch2_page_fault run #13: crashed: INFO: task hung in bch2_page_fault run #14: crashed: INFO: task hung in bch2_page_fault run #15: crashed: INFO: task hung in bch2_page_fault run #16: OK run #17: OK run #18: crashed: INFO: task hung in bch2_page_fault run #19: OK representative crash: INFO: task hung in bch2_page_fault, types: [HANG] check whether we can drop unnecessary instrumentation disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP LEAK UBSAN BUG], they are not needed testing commit 9afe652958c3ee88f24df1e4a97f298afce89407 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 746166cbfaf08e872cbfc98dcfeb8887f6b6eda15dee16208924a4b58af2aab8 all runs: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] the bug reproduces without the instrumentation disabling configs for [BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK UBSAN], they are not needed kconfig minimization: base=4088 full=8356 leaves diff=2126 split chunks (needed=false): <2126> split chunk #0 of len 2126 into 5 parts testing without sub-chunk 1/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP LEAK UBSAN BUG], they are not needed testing commit 9afe652958c3ee88f24df1e4a97f298afce89407 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 3e8f5ca0bfe4d17d334341c3440782fcfda1ea1a984e5cb634c572ca8a35bf84 all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 9afe652958c3ee88f24df1e4a97f298afce89407 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: cf28f42628f196446e43a8d3ac55a12c6dafc40f40795d32bbaafd96f1f74c57 run #0: crashed: INFO: task hung in bch2_page_fault run #1: crashed: INFO: task hung in bch2_page_fault run #2: crashed: INFO: task hung in bch2_page_fault run #3: crashed: INFO: task hung in bch2_readahead run #4: crashed: INFO: task hung in bch2_page_fault run #5: crashed: INFO: task hung in bch2_page_fault run #6: crashed: INFO: task hung in bch2_page_fault run #7: crashed: INFO: task hung in bch2_page_fault run #8: crashed: INFO: task hung in bch2_page_fault run #9: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed testing commit 9afe652958c3ee88f24df1e4a97f298afce89407 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: ba2d479a2bf16dc8c3204fd7ae724b9c7ae078c9965f7369925f59e64753635a all runs: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [LOCKDEP ATOMIC_SLEEP LEAK UBSAN BUG KASAN], they are not needed testing commit 9afe652958c3ee88f24df1e4a97f298afce89407 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: d9f5a2e898690975657fbc4646b22fbbbe2a97c50d002cfc4cb1194991273b55 all runs: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 9afe652958c3ee88f24df1e4a97f298afce89407 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: bc52ccf54e6ed4bf0d588efa8a3bd45782f497c41beea1e6272a25ccb892279e all runs: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] the chunk can be dropped minimized to 426 configs; suspects: [6LOWPAN 6LOWPAN_GHC_EXT_HDR_DEST 6LOWPAN_GHC_EXT_HDR_FRAG 6LOWPAN_GHC_EXT_HDR_HOP 6LOWPAN_GHC_EXT_HDR_ROUTE 6LOWPAN_GHC_ICMPV6 6LOWPAN_GHC_UDP 6LOWPAN_NHC 6LOWPAN_NHC_DEST 6LOWPAN_NHC_FRAGMENT 6LOWPAN_NHC_HOP 6LOWPAN_NHC_IPV6 6LOWPAN_NHC_MOBILITY 6LOWPAN_NHC_ROUTING 6LOWPAN_NHC_UDP 6PACK 842_COMPRESS 842_DECOMPRESS 9P_FSCACHE 9P_FS_POSIX_ACL 9P_FS_SECURITY ACORN_PARTITION ACORN_PARTITION_ADFS ACORN_PARTITION_CUMANA ACORN_PARTITION_EESOX ACORN_PARTITION_ICS ACORN_PARTITION_POWERTEC ACORN_PARTITION_RISCIX ACPI_NFIT ACPI_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_CRC32 ARCH_HAS_CRC64 ARCH_HAS_CRC_T10DIF 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_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_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_SHA1_SSSE3 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_DSC_HELPER DRM_DISPLAY_HDCP_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 [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], 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: ab07fcab4fe1c4d2e1c1c1dc696e6fb3f908bb4d91181a6a54738f117d0017f4 all runs: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] testing release v6.14 testing commit 38fec10eb60d687e30c8c6b5420d86e8149f7557 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 58c68cf7e0a0ec1207bd7f0281b844942d0b102b9e8b8b3ef10b45431d5df4ea run #0: crashed: INFO: task hung in bch2_page_fault run #1: crashed: INFO: task hung in bch2_page_fault run #2: crashed: INFO: task hung in bch2_page_fault run #3: crashed: INFO: task hung in bch2_page_fault run #4: crashed: INFO: task hung in bch2_page_fault run #5: crashed: INFO: task hung in bch2_page_fault run #6: crashed: INFO: task hung in bch2_page_fault run #7: OK run #8: crashed: INFO: task hung in bch2_page_fault run #9: OK representative crash: INFO: task hung in bch2_page_fault, types: [HANG] testing release v6.13 testing commit ffd294d346d185b70e28b1a28abe367bbfe53c04 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 7846f3b08580f2e4eed36dddc3a8c4bd627d7a90d263e34e4e490bf1742364f9 all runs: OK false negative chance: 0.000 # git bisect start 38fec10eb60d687e30c8c6b5420d86e8149f7557 ffd294d346d185b70e28b1a28abe367bbfe53c04 Bisecting: 6039 revisions left to test after this (roughly 13 steps) [2c8d2a510c15c003749e43ac2b8e1bc79a7a00d6] Merge tag 'sound-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound testing commit 2c8d2a510c15c003749e43ac2b8e1bc79a7a00d6 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 9b3a2c71074c79df45f95ea10785877d6cae2fbd5ccc5d3771a376f8b0ab24cc run #0: crashed: INFO: task hung in bch2_page_fault run #1: crashed: INFO: task hung in bch2_page_fault run #2: crashed: INFO: task hung in bch2_page_fault run #3: crashed: INFO: task hung in bch2_page_fault run #4: crashed: INFO: task hung in bch2_page_fault run #5: crashed: INFO: task hung in bch2_page_fault run #6: OK run #7: OK run #8: OK run #9: OK representative crash: INFO: task hung in bch2_page_fault, types: [HANG] # git bisect bad 2c8d2a510c15c003749e43ac2b8e1bc79a7a00d6 Bisecting: 3546 revisions left to test after this (roughly 12 steps) [5f537664e705b0bf8b7e329861f20128534f6a83] cachestat: fix page cache statistics permission checking testing commit 5f537664e705b0bf8b7e329861f20128534f6a83 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: cfcf501109cc4a00a9dbf32f46e2930bd7b166e43c39a0a53a110416214f664f run #0: crashed: INFO: task hung in bch2_page_fault run #1: crashed: INFO: task hung in bch2_page_fault run #2: crashed: INFO: task hung in bch2_page_fault run #3: crashed: INFO: task hung in bch2_page_fault run #4: crashed: INFO: task hung in bch2_page_fault run #5: crashed: INFO: task hung in bch2_page_fault run #6: crashed: INFO: task hung in bch2_page_fault run #7: OK run #8: crashed: INFO: task hung in bch2_page_fault run #9: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] # git bisect bad 5f537664e705b0bf8b7e329861f20128534f6a83 Bisecting: 1258 revisions left to test after this (roughly 10 steps) [c0e75905caf368e19aab585d20151500e750de89] Merge tag 'trace-sorttable-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace testing commit c0e75905caf368e19aab585d20151500e750de89 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 5404d1bf54f2ced16e613d74c88c2a0fe66e1aa1fd8e54fb720fe8b9ab8cad53 run #0: crashed: INFO: task hung in bch2_page_fault run #1: crashed: INFO: task hung in bch2_page_fault run #2: crashed: INFO: task hung in bch2_page_fault run #3: crashed: INFO: task hung in bch2_page_fault run #4: crashed: INFO: task hung in bch2_page_fault run #5: crashed: INFO: task hung in bch2_page_fault run #6: crashed: INFO: task hung in bch2_page_fault run #7: crashed: INFO: task hung in bch2_page_fault run #8: OK run #9: OK representative crash: INFO: task hung in bch2_page_fault, types: [HANG] # git bisect bad c0e75905caf368e19aab585d20151500e750de89 Bisecting: 664 revisions left to test after this (roughly 9 steps) [3d3a9c8b89d4f8a3785e06ffd15405c670696f02] Merge tag 'dlm-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm testing commit 3d3a9c8b89d4f8a3785e06ffd15405c670696f02 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 827cfafdb6a8c0b4940a4c35d785a2fd376678eb1d5d811c9e7a672fa42f8c88 run #0: crashed: INFO: task hung in bch2_page_fault run #1: crashed: INFO: task hung in bch2_page_fault run #2: crashed: INFO: task hung in bch2_page_fault run #3: crashed: INFO: task hung in bch2_page_fault run #4: crashed: INFO: task hung in bch2_page_fault run #5: crashed: INFO: task hung in bch2_page_fault run #6: crashed: INFO: task hung in bch2_page_fault run #7: OK run #8: OK run #9: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] # git bisect bad 3d3a9c8b89d4f8a3785e06ffd15405c670696f02 Bisecting: 287 revisions left to test after this (roughly 8 steps) [0eb4aaa230d725fa9b1cd758c0f17abca5597af6] Merge tag 'for-6.14-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux testing commit 0eb4aaa230d725fa9b1cd758c0f17abca5597af6 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 7822879af2ceb58551130f4b8358622c82a88ad0d92e35c29f9de6eb7ed21043 all runs: OK false negative chance: 0.000 # git bisect good 0eb4aaa230d725fa9b1cd758c0f17abca5597af6 Bisecting: 143 revisions left to test after this (roughly 7 steps) [4746ee182a76bbe4dd847180b0c8b575756b0d0d] bcachefs: Check for inode journal seq in the future testing commit 4746ee182a76bbe4dd847180b0c8b575756b0d0d gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 269620b7096aaf15029f433db0fdedc496ef205eabffcaec657910bbd7faee52 all runs: OK false negative chance: 0.000 # git bisect good 4746ee182a76bbe4dd847180b0c8b575756b0d0d Bisecting: 71 revisions left to test after this (roughly 6 steps) [056cae1c00b9773aa69791f4703262f690c28cdb] bcachefs: Add write buffer flush param to backpointer_get_key() testing commit 056cae1c00b9773aa69791f4703262f690c28cdb gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 26146915078c34b1d77938012a9e40a4c2c699d62a671827e9a336f6af79d903 all runs: OK false negative chance: 0.000 # git bisect good 056cae1c00b9773aa69791f4703262f690c28cdb Bisecting: 35 revisions left to test after this (roughly 5 steps) [cf67f46641abd71ec9c1e4b55481928c50975804] bcachefs: __bch2_btree_pos_to_text() testing commit cf67f46641abd71ec9c1e4b55481928c50975804 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 059b12abc7a751575744f9f620e74c0216823822a590faab0fa6330b45c2d966 all runs: crashed: INFO: task hung in bch2_page_fault representative crash: INFO: task hung in bch2_page_fault, types: [HANG] # git bisect bad cf67f46641abd71ec9c1e4b55481928c50975804 Bisecting: 17 revisions left to test after this (roughly 4 steps) [fa3e5135e4e7bfb38598a58caf592c940eff4b03] bcachefs: Fix assert for online fsck testing commit fa3e5135e4e7bfb38598a58caf592c940eff4b03 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: c99d7fc448910057c3726c8a97e444d6a5bd00dd6fa67ee9013e0b2612bc0b27 all runs: OK false negative chance: 0.000 # git bisect good fa3e5135e4e7bfb38598a58caf592c940eff4b03 Bisecting: 8 revisions left to test after this (roughly 3 steps) [cb3f34982c9dfccf1aadde4e69043c7da3107c92] bcachefs: Assert that btree write buffer only touches the right btrees testing commit cb3f34982c9dfccf1aadde4e69043c7da3107c92 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: dd57dc87e72650b33f73dda33fa94f04385a5692235315912daffb3a541c5bf0 all runs: OK false negative chance: 0.000 # git bisect good cb3f34982c9dfccf1aadde4e69043c7da3107c92 Bisecting: 4 revisions left to test after this (roughly 2 steps) [0971a72c3d1a8be44f54e72096c7d1fc5fbe512e] bcachefs: bch2_trans_unlock_write() testing commit 0971a72c3d1a8be44f54e72096c7d1fc5fbe512e gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: a1380b50df04951cd07d3623a12fcc0d277880806c82ab45d929d866587d933b all runs: OK false negative chance: 0.000 # git bisect good 0971a72c3d1a8be44f54e72096c7d1fc5fbe512e Bisecting: 2 revisions left to test after this (roughly 1 step) [8b1f46bff38f075b8d4071e7ac1edecb441fd53c] bcachefs: Dropped superblock write is no longer a fatal error testing commit 8b1f46bff38f075b8d4071e7ac1edecb441fd53c gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 8665e220d9d241c1b78f16b0448bc5ba4d3863391678be17986e1b7e3bd36fe1 run #0: crashed: INFO: task hung in bch2_page_fault run #1: crashed: INFO: task hung in bch2_page_fault run #2: crashed: INFO: task hung in bch2_page_fault run #3: crashed: INFO: task hung in bch2_page_fault run #4: crashed: INFO: task hung in bch2_page_fault run #5: crashed: INFO: task hung in bch2_readahead run #6: crashed: INFO: task hung in bch2_page_fault run #7: OK run #8: OK run #9: OK representative crash: INFO: task hung in bch2_page_fault, types: [HANG] # git bisect bad 8b1f46bff38f075b8d4071e7ac1edecb441fd53c Bisecting: 0 revisions left to test after this (roughly 0 steps) [8cfdc6ce1f785278ae2a1cf58e62d125986797fc] bcachefs: bch2_trans_node_drop() testing commit 8cfdc6ce1f785278ae2a1cf58e62d125986797fc gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 99535edaecbaf2e28ffa348cd61f9d124a2d83c0958ce605936da3886d939450 all runs: OK false negative chance: 0.000 # git bisect good 8cfdc6ce1f785278ae2a1cf58e62d125986797fc 8b1f46bff38f075b8d4071e7ac1edecb441fd53c is the first bad commit commit 8b1f46bff38f075b8d4071e7ac1edecb441fd53c Author: Kent Overstreet Date: Sat Dec 28 19:57:04 2024 -0500 bcachefs: Dropped superblock write is no longer a fatal error Just emit a warning if errors=continue or fix_safe. Signed-off-by: Kent Overstreet fs/bcachefs/super-io.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) accumulated error probability: 0.00 culprit signature: 8665e220d9d241c1b78f16b0448bc5ba4d3863391678be17986e1b7e3bd36fe1 parent signature: 99535edaecbaf2e28ffa348cd61f9d124a2d83c0958ce605936da3886d939450 revisions tested: 23, total time: 8h32m11.605951629s (build: 4h32m1.408425s, test: 3h42m49.551109871s) first bad commit: 8b1f46bff38f075b8d4071e7ac1edecb441fd53c bcachefs: Dropped superblock write is no longer a fatal error recipients (to): ["kent.overstreet@linux.dev"] recipients (cc): [] crash: INFO: task hung in bch2_page_fault INFO: task syz.6.58:5375 blocked for more than 143 seconds. Not tainted 6.13.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.58 state:D stack:12648 pid:5375 tgid:5375 ppid:2952 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x68f/0xa80 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xac/0x140 kernel/sched/core.c:6848 __bch2_two_state_lock+0xa3/0xe0 fs/bcachefs/two_state_shared_lock.c:7 bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline] bch2_page_fault+0xe7/0x1c0 fs/bcachefs/fs-io-pagecache.c:592 __do_fault+0x3d/0xd0 mm/memory.c:4907 do_shared_fault mm/memory.c:5386 [inline] do_fault mm/memory.c:5460 [inline] do_pte_missing mm/memory.c:3979 [inline] handle_pte_fault mm/memory.c:5801 [inline] __handle_mm_fault mm/memory.c:5944 [inline] handle_mm_fault+0xcdf/0x1ac0 mm/memory.c:6112 do_user_addr_fault+0x1a8/0x6f0 arch/x86/mm/fault.c:1338 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x54/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7efc525567c7 RSP: 002b:00007fff3c9d8a58 EFLAGS: 00010203 RAX: 0000200000002500 RBX: 0000000000000004 RCX: 0000200000002500 RDX: 00002000000036e8 RSI: 00007efc52025cad RDI: 0000200000002520 RBP: 00007efc527b7ba0 R08: 0000000000000000 R09: 0000000000000049 R10: 0000000000000000 R11: 0000000000000001 R12: 00007efc527b616c R13: 00007efc527b6160 R14: fffffffffffffffe R15: 00007fff3c9d8b70 INFO: task syz.6.58:5377 blocked for more than 143 seconds. Not tainted 6.13.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.58 state:D stack:7992 pid:5377 tgid:5375 ppid:2952 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x68f/0xa80 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xac/0x140 kernel/sched/core.c:6848 __bch2_two_state_lock+0xa3/0xe0 fs/bcachefs/two_state_shared_lock.c:7 bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline] bch2_readahead+0x2f9/0x5a0 fs/bcachefs/fs-io-buffered.c:272 read_pages+0x8f/0x1c0 mm/readahead.c:160 page_cache_ra_order+0x1fa/0x300 mm/readahead.c:512 page_cache_sync_readahead include/linux/pagemap.h:1397 [inline] filemap_get_pages+0x159/0x800 mm/filemap.c:2546 filemap_splice_read+0x1b3/0x3b0 mm/filemap.c:2922 do_splice_read fs/splice.c:985 [inline] splice_direct_to_actor+0xe9/0x2e0 fs/splice.c:1089 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x70/0xb0 fs/splice.c:1233 vfs_copy_file_range+0x519/0x6b0 fs/read_write.c:1620 __do_sys_copy_file_range fs/read_write.c:1670 [inline] __se_sys_copy_file_range+0x169/0x200 fs/read_write.c:1637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8f/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efc5258e929 RSP: 002b:00007efc533d6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146 RAX: ffffffffffffffda RBX: 00007efc527b5fa0 RCX: 00007efc5258e929 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007efc52610b39 R08: 0000000000400000 R09: 0000000000000000 R10: 00002000000000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007efc527b5fa0 R15: 00007fff3c9d88f8 INFO: task syz.6.58:5427 blocked for more than 143 seconds. Not tainted 6.13.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.58 state:D stack:13432 pid:5427 tgid:5375 ppid:2952 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x68f/0xa80 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xac/0x140 kernel/sched/core.c:6848 io_schedule+0x3f/0x60 kernel/sched/core.c:7681 folio_wait_bit_common+0x1c4/0x370 mm/filemap.c:1308 folio_lock include/linux/pagemap.h:1151 [inline] invalidate_inode_pages2_range+0x1ae/0x560 mm/truncate.c:627 bch2_write_invalidate_inode_pages_range+0x5b/0x80 fs/bcachefs/fs-io-pagecache.c:68 bch2_direct_write+0xb93/0xc50 fs/bcachefs/fs-io-direct.c:653 bch2_write_iter+0xa2/0xf80 fs/bcachefs/fs-io-buffered.c:1047 do_iter_readv_writev+0x17f/0x1d0 fs/read_write.c:-1 vfs_writev+0x236/0x4d0 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [inline] __do_sys_pwritev2 fs/read_write.c:1204 [inline] __se_sys_pwritev2+0x66/0x100 fs/read_write.c:1195 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8f/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efc5258e929 RSP: 002b:00007efc533b5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007efc527b6080 RCX: 00007efc5258e929 RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007efc52610b39 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000007000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007efc527b6080 R15: 00007fff3c9d88f8 Showing all locks held in the system: 1 lock held by pool_workqueue_/3: #0: ffffffff83b82fb8 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #0: ffffffff83b82fb8 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0x2de/0x640 kernel/rcu/tree_exp.h:976 1 lock held by khungtaskd/30: #0: ffffffff83b81fa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff83b81fa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff83b81fa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6744 1 lock held by kworker/1:1/44: #0: ffff888237d31418 (&rq->__lock){....}-{2:2}, at: raw_spin_rq_lock_nested+0x20/0x70 kernel/sched/core.c:598 2 locks held by getty/1478: #0: ffff8881086f58a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243 #1: ffffc90002acf2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x1bb/0x6e0 drivers/tty/n_tty.c:2211 2 locks held by kworker/u8:5/1579: #0: ffff88810007c948 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88810007c948 ((wq_completion)events_unbound){....}-{0:0}, at: process_scheduled_works+0x281/0x5e0 kernel/workqueue.c:3310 #1: ffffc90001037e58 ((reaper_work).work){....}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90001037e58 ((reaper_work).work){....}-{0:0}, at: process_scheduled_works+0x2a1/0x5e0 kernel/workqueue.c:3310 2 locks held by kworker/u8:7/2982: #0: ffff88810007c948 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88810007c948 ((wq_completion)events_unbound){....}-{0:0}, at: process_scheduled_works+0x281/0x5e0 kernel/workqueue.c:3310 #1: ffffc90002d57e58 (connector_reaper_work){....}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90002d57e58 (connector_reaper_work){....}-{0:0}, at: process_scheduled_works+0x2a1/0x5e0 kernel/workqueue.c:3310 1 lock held by syz.6.58/5375: #0: ffff88817a86c108 (&vma->vm_lock->lock){....}-{3:3}, at: vma_start_read include/linux/mm.h:716 [inline] #0: ffff88817a86c108 (&vma->vm_lock->lock){....}-{3:3}, at: lock_vma_under_rcu+0xda/0x1d0 mm/memory.c:6278 1 lock held by syz.6.58/5377: #0: ffff888179bc2ce8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:873 [inline] #0: ffff888179bc2ce8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_order+0xf3/0x300 mm/readahead.c:488 1 lock held by syz.6.58/5427: #0: ffff888109a953f8 (sb_writers#13){....}-{0:0}, at: do_pwritev fs/read_write.c:1146 [inline] #0: ffff888109a953f8 (sb_writers#13){....}-{0:0}, at: __do_sys_pwritev2 fs/read_write.c:1204 [inline] #0: ffff888109a953f8 (sb_writers#13){....}-{0:0}, at: __se_sys_pwritev2+0x66/0x100 fs/read_write.c:1195 2 locks held by syz.3.1010/15245: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0xa4/0xf0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x10b/0x170 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x8e/0x140 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline] watchdog+0x5ed/0x610 kernel/hung_task.c:397 kthread+0xe9/0x100 kernel/kthread.c:389 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2446 Comm: syz-execprog Not tainted 6.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0033:0x41567f Code: 4c 8d 04 3a 4c 8d 0c de 90 90 48 8d 1c de 48 8d 5b 08 49 83 f8 40 76 4d 48 8d 72 c0 48 f7 de 48 8d 14 17 48 8d 52 c0 49 8b 39 <48> d3 ef 48 89 c8 4c 89 c1 41 b9 01 00 00 00 49 d3 e1 48 f7 d8 48 RSP: 002b:00007ffd1cdc57c8 EFLAGS: 00000217 RAX: 00007fc312ec1e08 RBX: 000000c000337ff8 RCX: 00000000000003ba RDX: 000000000000000c RSI: 0000000000000006 RDI: abffff807fbffff8 RBP: 00007ffd1cdc57e0 R08: 000000000000004c R09: 000000c000337ff0 R10: 000000c0077d2800 R11: 00000000000000a3 R12: 00007ffd1cdc5870 R13: 0000000002e2aea0 R14: 000000000302dc20 R15: 0000000000000003 FS: 000000000302f590 GS: 0000000000000000