ci2 starts bisection 2026-01-13 16:55:55.010935555 +0000 UTC m=+4159567.188058632
bisecting fixing commit since cc5ec87693063acebb60f587e8a019ba9b94ae0e
building syzkaller on 4e1406b4defac0e2a9d9424c70706f79a7750cf3
ensuring issue is reproducible on original commit cc5ec87693063acebb60f587e8a019ba9b94ae0e
testing commit cc5ec87693063acebb60f587e8a019ba9b94ae0e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 13c74ecb7c7bdb2bf3bd298a4b7f3f0108d781bb1c78dc3ccf953db11b143844
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: crashed: INFO: task hung in blkdev_get_by_dev
run #2: crashed: INFO: task hung in blkdev_get_by_dev
run #3: crashed: INFO: task hung in blkdev_get_by_dev
run #4: crashed: INFO: task hung in blkdev_get_by_dev
run #5: crashed: INFO: task hung in blkdev_get_by_dev
run #6: crashed: INFO: task hung in blkdev_get_by_dev
run #7: crashed: INFO: task hung in blkdev_get_by_dev
run #8: crashed: INFO: task hung in blkdev_get_by_dev
run #9: crashed: INFO: task hung in blkdev_get_by_dev
run #10: crashed: INFO: task hung in blkdev_get_by_dev
run #11: crashed: INFO: task hung in blkdev_get_by_dev
run #12: crashed: INFO: task hung in blkdev_get_by_dev
run #13: crashed: INFO: task hung in blkdev_get_by_dev
run #14: crashed: INFO: task hung in blkdev_get_by_dev
run #15: crashed: INFO: task hung in blkdev_get_by_dev
run #16: crashed: INFO: task hung in blkdev_get_by_dev
run #17: crashed: INFO: task hung in read_part_sector
run #18: crashed: INFO: task hung in blkdev_get_by_dev
run #19: crashed: INFO: task hung in blkdev_get_by_dev
representative crash: INFO: task hung in blkdev_get_by_dev, types: [HANG]
check whether we can drop unnecessary instrumentation
disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit cc5ec87693063acebb60f587e8a019ba9b94ae0e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 142af3bc9e24c5cff743b9733c4503bc7c3906e07d8b8cf7d0bc333e2ba350f7
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #2: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #3: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #4: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #5: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #6: ignore: lost connection to test machine
run #7: crashed: INFO: task hung in blkdev_get_by_dev
run #8: crashed: INFO: task hung in blkdev_get_by_dev
run #9: OK
representative crash: INFO: task hung in blkdev_get_by_dev, types: [HANG]
unable to determine the verdict: 1 good runs (wanted 5), for bad wanted 5 in total, got 3
kconfig minimization: base=3707 full=7424 leaves diff=2101
split chunks (needed=false): <2101>
split chunk #0 of len 2101 into 5 parts
testing without sub-chunk 1/5
testing commit cc5ec87693063acebb60f587e8a019ba9b94ae0e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 608e5c0eb68eff6863bdc67dccd2ae688f82d9bc66a725041ca4837df2f957ad
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
false negative chance: 0.000
testing without sub-chunk 2/5
testing commit cc5ec87693063acebb60f587e8a019ba9b94ae0e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: f24a63b59a3a2073c6b67f691c3dc907b16de1f0f95fb8ac038b84c716bd28f3
run #0: crashed: INFO: task hung in blkdev_get_by_dev
run #1: crashed: INFO: task hung in blkdev_get_by_dev
run #2: crashed: INFO: task hung in blkdev_get_by_dev
run #3: crashed: INFO: task hung in blkdev_get_by_dev
run #4: crashed: INFO: task hung in blkdev_get_by_dev
run #5: crashed: INFO: task hung in blkdev_get_by_dev
run #6: crashed: INFO: task hung in blkdev_get_by_dev
run #7: crashed: INFO: task hung in blkdev_get_by_dev
run #8: crashed: INFO: task hung in blkdev_get_by_dev
run #9: OK
representative crash: INFO: task hung in blkdev_get_by_dev, types: [HANG]
the chunk can be dropped
testing without sub-chunk 3/5
testing commit cc5ec87693063acebb60f587e8a019ba9b94ae0e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 780dbbe45626bc92f4d8f599dad9947ad91a62abfbec6cb776d544c297b556b1
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #2: crashed: INFO: task hung in blkdev_get_by_dev
run #3: crashed: INFO: task hung in blkdev_get_by_dev
run #4: crashed: INFO: task hung in blkdev_get_by_dev
run #5: crashed: INFO: task hung in blkdev_get_by_dev
run #6: crashed: INFO: task hung in blkdev_get_by_dev
run #7: OK
run #8: crashed: INFO: task hung in blkdev_get_by_dev
run #9: OK
representative crash: INFO: task hung in blkdev_get_by_dev, types: [HANG]
the chunk can be dropped
testing without sub-chunk 4/5
testing commit cc5ec87693063acebb60f587e8a019ba9b94ae0e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 8693770384c8603a6635f11e5f7341c1e93f9cb654c316c6f4adaf8a8beb7aa7
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #2: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #3: crashed: INFO: task hung in blkdev_get_by_dev
run #4: crashed: INFO: task hung in blkdev_get_by_dev
run #5: crashed: INFO: task hung in blkdev_get_by_dev
run #6: crashed: INFO: task hung in blkdev_get_by_dev
run #7: OK
run #8: OK
run #9: OK
representative crash: INFO: task hung in blkdev_get_by_dev, types: [HANG]
the chunk can be dropped
testing without sub-chunk 5/5
testing commit cc5ec87693063acebb60f587e8a019ba9b94ae0e gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 66cfe2781a150fe655d3e05982f65f85626632ab54d12ba1640c368f220a5748
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #2: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #3: crashed: INFO: task hung in blkdev_get_by_dev
run #4: crashed: INFO: task hung in blkdev_get_by_dev
run #5: crashed: INFO: task hung in blkdev_get_by_dev
run #6: crashed: INFO: task hung in blkdev_get_by_dev
run #7: crashed: INFO: task hung in blkdev_get_by_dev
run #8: crashed: INFO: task hung in blkdev_get_by_dev
run #9: OK
representative crash: INFO: task hung in blkdev_get_by_dev, types: [HANG]
the chunk can be dropped
minimized to 421 configs; suspects: [6LOWPAN 6LOWPAN_GHC_EXT_HDR_DEST 6LOWPAN_GHC_EXT_HDR_FRAG 6LOWPAN_GHC_EXT_HDR_HOP 6LOWPAN_GHC_EXT_HDR_ROUTE 6LOWPAN_GHC_ICMPV6 6LOWPAN_GHC_UDP 6LOWPAN_NHC 6LOWPAN_NHC_DEST 6LOWPAN_NHC_FRAGMENT 6LOWPAN_NHC_HOP 6LOWPAN_NHC_IPV6 6LOWPAN_NHC_MOBILITY 6LOWPAN_NHC_ROUTING 6LOWPAN_NHC_UDP 6PACK 842_COMPRESS 842_DECOMPRESS 9P_FSCACHE 9P_FS_POSIX_ACL 9P_FS_SECURITY ACORN_PARTITION ACORN_PARTITION_ADFS ACORN_PARTITION_CUMANA ACORN_PARTITION_EESOX ACORN_PARTITION_ICS ACORN_PARTITION_POWERTEC ACORN_PARTITION_RISCIX ACPI_NFIT ACPI_PLATFORM_PROFILE ADFS_FS AFFS_FS AFS_FS AFS_FSCACHE AF_KCM AF_RXRPC AF_RXRPC_IPV6 AIX_PARTITION AMD_SFH_HID AMIGA_PARTITION ANDROID ANDROID_BINDERFS ANDROID_BINDER_IPC APPLE_MFI_FASTCHARGE AR5523 ARCH_ENABLE_THP_MIGRATION ASHMEM ASM_MODVERSIONS ASN1_ENCODER ASYNC_CORE ASYNC_MEMCPY ASYNC_PQ ASYNC_RAID6_RECOV ASYNC_TX_DMA ASYNC_XOR ATARI_PARTITION ATA_GENERIC ATA_OVER_ETH ATH10K ATH10K_CE ATH10K_PCI ATH10K_USB ATH11K ATH6KL ATH6KL_USB ATH9K ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_CHANNEL_CONTEXT ATH9K_COMMON ATH9K_COMMON_DEBUG ATH9K_COMMON_SPECTRAL ATH9K_DEBUGFS ATH9K_DYNACK ATH9K_HTC ATH9K_HTC_DEBUGFS ATH9K_HW ATH9K_PCI ATH9K_PCOEM ATH9K_RFKILL ATH_COMMON ATM ATM_BR2684 ATM_CLIP ATM_DRIVERS ATM_LANE ATM_MPOA ATM_TCP AX25 AX25_DAMA_SLAVE AX88796B_PHY BAREUDP BATMAN_ADV BATMAN_ADV_BATMAN_V BATMAN_ADV_BLA BATMAN_ADV_DAT BATMAN_ADV_MCAST BATMAN_ADV_NC BCACHE BCMA BCMA_HOST_PCI_POSSIBLE BEFS_FS BFQ_CGROUP_DEBUG BFQ_GROUP_IOSCHED BFS_FS BIG_KEYS BLK_CGROUP BLK_CGROUP_IOCOST BLK_CGROUP_IOLATENCY BLK_CGROUP_RWSTAT BLK_DEBUG_FS_ZONED BLK_DEV_BSGLIB BLK_DEV_CRYPTOLOOP BLK_DEV_INITRD BLK_DEV_INTEGRITY BLK_DEV_INTEGRITY_T10 BLK_DEV_NBD BLK_DEV_NULL_BLK BLK_DEV_NULL_BLK_FAULT_INJECTION BLK_DEV_NVME BLK_DEV_PMEM BLK_DEV_RAM BLK_DEV_RNBD BLK_DEV_RNBD_CLIENT BLK_DEV_THROTTLING BLK_INLINE_ENCRYPTION BLK_INLINE_ENCRYPTION_FALLBACK BLK_MQ_RDMA BLK_RQ_ALLOC_TIME BLK_WBT BLK_WBT_MQ BLOCK_LEGACY_AUTOLOAD BONDING BPF_EVENTS BPF_JIT BPF_JIT_ALWAYS_ON BPF_JIT_DEFAULT_ON BPF_LSM BPF_PRELOAD BPF_PRELOAD_UMD BPF_SYSCALL BPQETHER BRIDGE BRIDGE_CFM BRIDGE_EBT_802_3 BRIDGE_EBT_AMONG BRIDGE_EBT_ARP BRIDGE_EBT_ARPREPLY BRIDGE_EBT_BROUTE BRIDGE_EBT_DNAT BRIDGE_EBT_IP BRIDGE_EBT_IP6 BRIDGE_EBT_LIMIT BRIDGE_EBT_LOG BRIDGE_EBT_MARK BRIDGE_EBT_MARK_T BRIDGE_EBT_NFLOG BRIDGE_EBT_PKTTYPE BRIDGE_EBT_REDIRECT BRIDGE_EBT_SNAT BRIDGE_EBT_STP BRIDGE_EBT_T_FILTER BRIDGE_EBT_T_NAT BRIDGE_EBT_VLAN BRIDGE_IGMP_SNOOPING BRIDGE_MRP BRIDGE_NF_EBTABLES BRIDGE_VLAN_FILTERING BSD_DISKLABEL BSD_PROCESS_ACCT_V3 BT BTRFS_ASSERT BTRFS_FS BTRFS_FS_POSIX_ACL BTRFS_FS_REF_VERIFY BTT BT_6LOWPAN BT_ATH3K BT_BCM BT_BNEP BT_BNEP_MC_FILTER BT_BNEP_PROTO_FILTER BT_BREDR BT_CMTP BT_HCIBCM203X BT_HCIBFUSB BT_HCIBPA10X BT_HCIBTUSB BT_HCIBTUSB_AUTOSUSPEND BT_HCIBTUSB_BCM BT_HCIBTUSB_MTK BT_HCIBTUSB_RTL BT_HCIUART BT_HCIUART_3WIRE BT_HCIUART_AG6XX BT_HCIUART_BCSP BT_HCIUART_H4 BT_HCIUART_LL BT_HCIUART_MRVL BT_HCIUART_QCA BT_HCIUART_SERDEV BT_HCIVHCI BT_HIDP BT_HS BT_INTEL BT_LE BT_LEDS BT_MSFTEXT BT_QCA BT_RFCOMM BT_RFCOMM_TTY BT_RTL CACHEFILES CAIF CAIF_DEBUG CAIF_DRIVERS CAIF_NETDEV CAIF_TTY CAIF_USB CAIF_VIRTIO CAN CAN_8DEV_USB CAN_BCM CAN_CALC_BITTIMING CAN_DEV CAN_EMS_USB CAN_ESD_USB2 CAN_ETAS_ES58X CAN_GS_USB CAN_GW CAN_IFI_CANFD CAN_ISOTP CAN_J1939 CAN_KVASER_USB CAN_MCBA_USB CAN_PEAK_USB CAN_RAW CAN_SLCAN CAN_UCAN CAN_VCAN CAN_VXCAN CAPI_TRACE CARL9170 CARL9170_HWRNG CARL9170_LEDS CARL9170_WPC CEC_CORE CEPH_FS CEPH_FSCACHE CEPH_FS_POSIX_ACL CEPH_LIB CEPH_LIB_USE_DNS_RESOLVER CFG80211 CFG80211_CRDA_SUPPORT CFG80211_DEBUGFS CFG80211_DEFAULT_PS CFG80211_REQUIRE_SIGNED_REGDB CFG80211_USE_KERNEL_REGDB_KEYS CFG80211_WEXT CFS_BANDWIDTH CGROUP_DEVICE CGROUP_HUGETLB CGROUP_NET_CLASSID CGROUP_NET_PRIO CGROUP_PERF CGROUP_RDMA CGROUP_WRITEBACK CHARGER_ISP1704 CHR_DEV_ST CIFS CIFS_ALLOW_INSECURE_LEGACY CIFS_DEBUG CIFS_DFS_UPCALL CIFS_FSCACHE CIFS_POSIX CIFS_SMB_DIRECT CIFS_SWN_UPCALL CIFS_UPCALL CIFS_XATTR CLS_U32_MARK CLS_U32_PERF CMA CMA_SIZE_SEL_MBYTES CMDLINE_PARTITION COMEDI COMEDI_8254 COMEDI_8255 COMEDI_8255_PCI COMEDI_8255_SA COMEDI_ADL_PCI9118 COMEDI_ADQ12B COMEDI_AIO_AIO12_8 COMEDI_AIO_IIRO_16 COMEDI_AMPLC_DIO200 COMEDI_AMPLC_DIO200_ISA COMEDI_AMPLC_PC236 COMEDI_AMPLC_PC236_ISA COMEDI_AMPLC_PC263_ISA COMEDI_BOND COMEDI_C6XDIGIO COMEDI_DAC02 COMEDI_DAS08 COMEDI_DAS08_ISA COMEDI_DAS16M1 COMEDI_DAS1800 COMEDI_DAS6402 COMEDI_DAS800 COMEDI_DMM32AT COMEDI_DT2801 COMEDI_DT2811 COMEDI_DT2814 COMEDI_DT2815 COMEDI_DT2817 COMEDI_DT282X COMEDI_DT9812 COMEDI_FL512 COMEDI_ISADMA COMEDI_ISA_DRIVERS COMEDI_KCOMEDILIB COMEDI_MISC_DRIVERS COMEDI_MPC624 COMEDI_MULTIQ3 COMEDI_NI_ATMIO16D COMEDI_NI_AT_A2150 COMEDI_NI_AT_AO COMEDI_NI_DAQ_700_CS COMEDI_NI_LABPC COMEDI_NI_LABPC_CS COMEDI_NI_LABPC_ISA COMEDI_NI_LABPC_ISADMA COMEDI_NI_LABPC_PCI COMEDI_NI_USB6501 COMEDI_PARPORT COMEDI_PCI_DRIVERS COMEDI_PCL711 COMEDI_PCL724 COMEDI_PCL726 COMEDI_PCL730 COMEDI_PCL812 COMEDI_PCL816 COMEDI_PCL818 COMEDI_PCM3724 COMEDI_PCMAD COMEDI_PCMCIA_DRIVERS COMEDI_PCMDA12 COMEDI_PCMMIO COMEDI_PCMUIO COMEDI_RTI800 COMEDI_RTI802 COMEDI_S526 COMEDI_TEST COMEDI_USBDUX COMEDI_USBDUXFAST COMEDI_USBDUXSIGMA COMEDI_USB_DRIVERS COMEDI_VMK80XX COMPAT_NETLINK_MESSAGES COUNTER CRAMFS CRAMFS_BLOCKDEV CRAMFS_MTD CRC4 CRC64 CRC7 CRC8 CRC_ITU_T CRC_T10DIF CRYPTO_ADIANTUM CRYPTO_AEGIS128 CRYPTO_AEGIS128_AESNI_SSE2 CRYPTO_AES_NI_INTEL CRYPTO_AES_TI CRYPTO_ANSI_CPRNG CRYPTO_ANUBIS CRYPTO_ARC4 CRYPTO_ARCH_HAVE_LIB_BLAKE2S CRYPTO_ARCH_HAVE_LIB_CHACHA CRYPTO_ARCH_HAVE_LIB_CURVE25519 CRYPTO_ARCH_HAVE_LIB_POLY1305 CRYPTO_BLAKE2B CRYPTO_BLAKE2S_X86 CRYPTO_BLOWFISH CRYPTO_BLOWFISH_COMMON CRYPTO_BLOWFISH_X86_64 CRYPTO_CAMELLIA CRYPTO_CAMELLIA_AESNI_AVX2_X86_64 CRYPTO_CAMELLIA_AESNI_AVX_X86_64 CRYPTO_CAMELLIA_X86_64 CRYPTO_CAST5 CRYPTO_CAST5_AVX_X86_64 CRYPTO_CAST6 CRYPTO_CAST6_AVX_X86_64 CRYPTO_CAST_COMMON CRYPTO_CHACHA20 CRYPTO_CHACHA20POLY1305 CRYPTO_CHACHA20_X86_64 CRYPTO_CRC32 CRYPTO_CRC32C_INTEL CRYPTO_CRC32_PCLMUL CRYPTO_CRCT10DIF CRYPTO_CRCT10DIF_PCLMUL CRYPTO_CRYPTD CRYPTO_CTS CRYPTO_CURVE25519 CRYPTO_CURVE25519_X86 CRYPTO_DEFLATE CRYPTO_DES CRYPTO_DES3_EDE_X86_64 CRYPTO_DEV_CCP CRYPTO_DEV_CCP_DD CRYPTO_DEV_PADLOCK CRYPTO_DEV_PADLOCK_AES CRYPTO_DEV_PADLOCK_SHA CRYPTO_DEV_QAT CRYPTO_DEV_QAT_C3XXX CRYPTO_DEV_QAT_C3XXXVF CRYPTO_DEV_QAT_C62X CRYPTO_DEV_QAT_C62XVF CRYPTO_DEV_QAT_DH895xCC CRYPTO_DEV_QAT_DH895xCCVF CRYPTO_DEV_VIRTIO CRYPTO_DH CRYPTO_DRBG_CTR CRYPTO_DRBG_HASH CRYPTO_ECB CRYPTO_ECC CRYPTO_ECDH CRYPTO_ECRDSA CRYPTO_ENGINE CRYPTO_ESSIV CRYPTO_FCRYPT CRYPTO_GHASH_CLMUL_NI_INTEL CRYPTO_KEYWRAP CRYPTO_KHAZAD CRYPTO_KPP CRYPTO_LIB_ARC4 CRYPTO_LIB_CHACHA CRYPTO_LIB_CHACHA20POLY1305 CRYPTO_LIB_CHACHA_GENERIC CRYPTO_LIB_CURVE25519 CRYPTO_LIB_CURVE25519_GENERIC CRYPTO_LIB_DES CRYPTO_LIB_POLY1305 CRYPTO_LIB_POLY1305_GENERIC CRYPTO_LIB_SM4 CRYPTO_LRW CRYPTO_MICHAEL_MIC CRYPTO_NHPOLY1305 CRYPTO_NHPOLY1305_AVX2 CRYPTO_NHPOLY1305_SSE2 CRYPTO_PCBC CRYPTO_PCRYPT CRYPTO_POLY1305 CRYPTO_POLY1305_X86_64 CRYPTO_RMD160 CRYPTO_SEED CRYPTO_SERPENT CRYPTO_SERPENT_AVX2_X86_64 CRYPTO_SERPENT_AVX_X86_64 CRYPTO_SERPENT_SSE2_X86_64 CRYPTO_SHA1_SSSE3 CRYPTO_SHA256_SSSE3 CRYPTO_SHA3 CRYPTO_SHA512_SSSE3 CRYPTO_SIMD CRYPTO_SM2 CRYPTO_SM3 CRYPTO_SM4 CRYPTO_STREEBOG CRYPTO_TEA CRYPTO_TWOFISH CRYPTO_TWOFISH_AVX_X86_64 CRYPTO_TWOFISH_COMMON CRYPTO_TWOFISH_X86_64 CRYPTO_TWOFISH_X86_64_3WAY CRYPTO_USER CRYPTO_USER_API CRYPTO_USER_API_AEAD CRYPTO_USER_API_ENABLE_OBSOLETE CRYPTO_USER_API_HASH CRYPTO_USER_API_RNG CRYPTO_USER_API_SKCIPHER CRYPTO_VMAC CRYPTO_WP512 CRYPTO_XCBC CRYPTO_XTS CRYPTO_XXHASH CUSE CYPRESS_FIRMWARE DAMON DAMON_DBGFS DAMON_VADDR DCA DCB DEBUG_PREEMPT DMA_CMA FSCACHE FUSE_FS HAMRADIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ ISDN ISDN_CAPI LIBNVDIMM MAC80211 MAC80211_LEDS MEDIA_SUPPORT MTD NET_CLS_U32 PARTITION_ADVANCED PCCARD PCMCIA PREEMPTION RFKILL SERIAL_DEV_BUS STAGING TLS TLS_DEVICE USB_GADGET USB_PHY VLAN_8021Q WANT_COMPAT_NETLINK_MESSAGES WEXT_CORE WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ATH]
testing current HEAD 68efe5a6c16a05391e3d96025b41e9bf573f968c
testing commit 68efe5a6c16a05391e3d96025b41e9bf573f968c gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40
kernel signature: 8dc61172348b411030fcdb8bb1ad4fc7bf363eb99c781c677d97b9b17e9f7d10
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #2: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #3: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #4: crashed: INFO: task hung in blkdev_get_by_dev
run #5: crashed: INFO: task hung in blkdev_get_by_dev
run #6: crashed: INFO: task hung in blkdev_get_by_dev
run #7: crashed: INFO: task hung in read_part_sector
run #8: OK
run #9: OK
representative crash: INFO: task hung in blkdev_get_by_dev, types: [HANG]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 3h29m51.191255186s (build: 1h19m37.330886743s, test: 2h0m16.780278806s)
crash still not fixed or there were kernel test errors
commit msg: Linux 5.15.197
crash: INFO: task hung in blkdev_get_by_dev
INFO: task udevd:850 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:26544 pid: 850 ppid: 1 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x8f8/0x2560 kernel/sched/core.c:6395
schedule+0x106/0x230 kernel/sched/core.c:6478
schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:6537
__mutex_lock_common kernel/locking/mutex.c:669 [inline]
__mutex_lock+0xa03/0x12b0 kernel/locking/mutex.c:729
blkdev_get_by_dev.part.0+0x76/0xa00 block/bdev.c:820
blkdev_open+0xf6/0x220 block/fops.c:466
do_dentry_open+0x466/0xfe0 fs/open.c:826
do_open fs/namei.c:3616 [inline]
path_openat+0x142e/0x2370 fs/namei.c:3750
do_filp_open+0x199/0x3d0 fs/namei.c:3777
do_sys_openat2+0x11e/0x400 fs/open.c:1255
do_sys_open fs/open.c:1271 [inline]
__do_sys_openat fs/open.c:1287 [inline]
__se_sys_openat fs/open.c:1282 [inline]
__x64_sys_openat+0x11b/0x1d0 fs/open.c:1282
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f13009cd407
RSP: 002b:00007ffc375d33c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f13008df880 RCX: 00007f13009cd407
RDX: 00000000000a0800 RSI: 000055cb0328fda0 RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 000055cac6d96100 R14: 0000000000000000 R15: 00007ffc375d3650
INFO: task udevd:2796 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:26584 pid: 2796 ppid: 850 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x8f8/0x2560 kernel/sched/core.c:6395
schedule+0x106/0x230 kernel/sched/core.c:6478
io_schedule+0xba/0x130 kernel/sched/core.c:8503
wait_on_page_bit_common+0x3b2/0x940 mm/filemap.c:1356
wait_on_page_bit mm/filemap.c:1417 [inline]
wait_on_page_locked include/linux/pagemap.h:688 [inline]
wait_on_page_read mm/filemap.c:3437 [inline]
do_read_cache_page+0x5b7/0xa40 mm/filemap.c:3480
read_mapping_page include/linux/pagemap.h:515 [inline]
read_part_sector+0xe7/0x390 block/partitions/core.c:726
adfspart_check_ICS+0x92/0x850 block/partitions/acorn.c:360
check_partition block/partitions/core.c:148 [inline]
blk_add_partitions block/partitions/core.c:611 [inline]
bdev_disk_changed block/partitions/core.c:697 [inline]
bdev_disk_changed+0x565/0xeb0 block/partitions/core.c:664
blkdev_get_whole+0x195/0x240 block/bdev.c:682
blkdev_get_by_dev.part.0+0x2b8/0xa00 block/bdev.c:827
blkdev_open+0xf6/0x220 block/fops.c:466
do_dentry_open+0x466/0xfe0 fs/open.c:826
do_open fs/namei.c:3616 [inline]
path_openat+0x142e/0x2370 fs/namei.c:3750
do_filp_open+0x199/0x3d0 fs/namei.c:3777
do_sys_openat2+0x11e/0x400 fs/open.c:1255
do_sys_open fs/open.c:1271 [inline]
__do_sys_openat fs/open.c:1287 [inline]
__se_sys_openat fs/open.c:1282 [inline]
__x64_sys_openat+0x11b/0x1d0 fs/open.c:1282
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f13009cd407
RSP: 002b:00007ffc375d3200 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f13008df880 RCX: 00007f13009cd407
RDX: 00000000000a0800 RSI: 000055cb0329a190 RDI: ffffffffffffff9c
RBP: 000055cb03275910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055cb033488b0
R13: 000055cb0328d410 R14: 0000000000000000 R15: 000055cb033488b0
INFO: task syz.2.23:2809 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.23 state:D stack:28608 pid: 2809 ppid: 2394 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x8f8/0x2560 kernel/sched/core.c:6395
schedule+0x106/0x230 kernel/sched/core.c:6478
schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:6537
__mutex_lock_common kernel/locking/mutex.c:669 [inline]
__mutex_lock+0xa03/0x12b0 kernel/locking/mutex.c:729
blkdev_put+0x81/0x850 block/bdev.c:915
blkdev_close+0x88/0xb0 block/fops.c:478
__fput+0x200/0x9b0 fs/file_table.c:311
task_work_run+0xc0/0x160 kernel/task_work.c:188
get_signal+0x1508/0x2340 kernel/signal.c:2672
arch_do_signal_or_restart+0x2b8/0x1820 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop kernel/entry/common.c:178 [inline]
exit_to_user_mode_prepare+0x1c1/0x240 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:307
do_syscall_64+0x40/0x80 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8dfd4916c9
RSP: 002b:00007f8dfcb00038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f8dfd6e7fa0 RCX: 00007f8dfd4916c9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f8dfd513f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8dfd6e8038 R14: 00007f8dfd6e7fa0 R15: 00007fff6c587018
Showing all locks held in the system:
1 lock held by khungtaskd/26:
#0: ffffffff862946c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x27b kernel/locking/lockdep.c:6471
1 lock held by udevd/850:
#0: ffff88810ae82118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x76/0xa00 block/bdev.c:820
2 locks held by getty/915:
#0: ffff88810ec5b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900000562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xb20/0x1040 drivers/tty/n_tty.c:2158
2 locks held by kworker/u5:2/984:
#0: ffff88810b241138 ((wq_completion)nbd3-recv){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff88810b241138 ((wq_completion)nbd3-recv){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff88810b241138 ((wq_completion)nbd3-recv){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
#0: ffff88810b241138 ((wq_completion)nbd3-recv){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
#0: ffff88810b241138 ((wq_completion)nbd3-recv){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
#0: ffff88810b241138 ((wq_completion)nbd3-recv){+.+.}-{0:0}, at: process_one_work+0x780/0x1350 kernel/workqueue.c:2281
#1: ffffc90000617db8 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x7ad/0x1350 kernel/workqueue.c:2285
1 lock held by udevd/2796:
#0: ffff88810ae82118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x76/0xa00 block/bdev.c:820
1 lock held by syz.2.23/2809:
#0: ffff88810ae82118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x81/0x850 block/bdev.c:915
1 lock held by syz.3.191/3568:
#0: ffff88810b235208 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x11e/0x990 drivers/block/nbd.c:1460
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 26 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x32/0xc4 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x168/0x190 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0x8ad/0xbb0 kernel/hung_task.c:369
kthread+0x376/0x450 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 136 Comm: kworker/u4:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:lockdep_hardirqs_on+0x49/0xf0 kernel/locking/lockdep.c:4328
Code: 00 00 f0 00 48 89 fd 75 41 65 8b 05 79 dd 32 7b 85 c0 75 5d 65 8b 05 82 db 32 7b 85 c0 75 52 8b 35 1c 32 30 0a 85 f6 75 21 9c <58> f6 c4 02 75 6e 8b 15 0b 32 30 0a 85 d2 75 10 48 8b 83 98 0a 00
RSP: 0018:ffffc90000e37be0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff888104dc3980 RCX: 1ffffffff16cb1f2
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff812141ad
RBP: ffffffff812141ad R08: 0000000000000001 R09: ffffffff8b610d5f
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff84b28250
R13: ffff88811dbc5d40 R14: ffff888117398c00 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6d02eabf98 CR3: 000000010d9df000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__local_bh_enable_ip+0x9d/0xf0 kernel/softirq.c:406
spin_unlock_bh include/linux/spinlock.h:409 [inline]
batadv_nc_purge_paths+0x1e9/0x2d0 net/batman-adv/network-coding.c:475
batadv_nc_worker+0x72b/0xda0 net/batman-adv/network-coding.c:726
process_one_work+0x85b/0x1350 kernel/workqueue.c:2310
worker_thread+0x5a6/0xf90 kernel/workqueue.c:2457
kthread+0x376/0x450 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287