ci2 starts bisection 2024-05-08 11:04:17.781438253 +0000 UTC m=+38791.382594211 bisecting cause commit starting from dccb07f2914cdab2ac3a5b6c98406f765acab803 building syzkaller on 4cf3f9b3f15d248d052cd369d23308c953d657d9 ensuring issue is reproducible on original commit dccb07f2914cdab2ac3a5b6c98406f765acab803 testing commit dccb07f2914cdab2ac3a5b6c98406f765acab803 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ef860b0cba23bb53e21292017ac71d244504b17a5cfa785f172d80f83baf2bec all runs: crashed: possible deadlock in kernfs_seq_start representative crash: possible deadlock in kernfs_seq_start, 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 dccb07f2914cdab2ac3a5b6c98406f765acab803 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 29da274490d653724334d9b993b2b7075a80cbce526155176157bf69e0d180d8 all runs: crashed: possible deadlock in kernfs_seq_start representative crash: possible deadlock in kernfs_seq_start, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed kconfig minimization: base=3971 full=8000 leaves diff=2012 split chunks (needed=false): <2012> split chunk #0 of len 2012 into 5 parts testing without sub-chunk 1/5 disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit dccb07f2914cdab2ac3a5b6c98406f765acab803 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 81ba5c2efcf6307820e08d75925c21cab8aed9d990da24ffb78000b287571d0b all runs: crashed: possible deadlock in kernfs_seq_start representative crash: possible deadlock in kernfs_seq_start, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit dccb07f2914cdab2ac3a5b6c98406f765acab803 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7f2a668f36a21b79eba79c1fe6dfdde1891074e6979e2dc75cdecd0236aa2f86 all runs: crashed: possible deadlock in kernfs_seq_start representative crash: possible deadlock in kernfs_seq_start, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit dccb07f2914cdab2ac3a5b6c98406f765acab803 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 255620caa193786a2d85c3691f4a982bb8bc6ab56aace9485d20138af5bcbf7a all runs: crashed: possible deadlock in kernfs_seq_start representative crash: possible deadlock in kernfs_seq_start, 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 dccb07f2914cdab2ac3a5b6c98406f765acab803 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 94170ca5fc62af050a11e6c65f7cd7118ce79b05befe40b4a65c03d8bcbba6cd all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP HANG LEAK], they are not needed testing commit dccb07f2914cdab2ac3a5b6c98406f765acab803 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7a7023551c67605558374d9f52ca04261ae2a2f8372bf981913d1899cbbe2cc4 all runs: crashed: possible deadlock in kernfs_seq_start representative crash: possible deadlock in kernfs_seq_start, types: [LOCKDEP] the chunk can be dropped minimized to 403 configs; suspects: [AF_RXRPC ARCH_ENABLE_MEMORY_HOTREMOVE ATM AX25 CFG80211 CMA DAX DLM DVB_CORE ENCRYPTED_KEYS EXTCON GENEVE GPIOLIB HAMRADIO HAVE_CLK HID_SENSOR_HUB HID_SMARTJOYPLUS HID_THRUSTMASTER IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_IPOIB INFINIBAND_USER_ACCESS INFINIBAND_VIRT_DMA INPUT_TABLET INPUT_TOUCHSCREEN IP_SCTP L2TP LIBNVDIMM MEDIA_COMMON_OPTIONS MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MFD_RETU MMC MTD MTD_UBI NETFILTER_CONNCOUNT NET_IPGRE NET_IPGRE_DEMUX NFS_V4_1 NF_SOCKET_IPV4 NF_SOCKET_IPV6 NF_TPROXY_IPV4 NF_TPROXY_IPV6 NILFS2_FS NLMON NLS_CODEPAGE_1250 NLS_CODEPAGE_1251 NLS_CODEPAGE_737 NLS_CODEPAGE_775 NLS_CODEPAGE_850 NLS_CODEPAGE_852 NLS_CODEPAGE_855 NLS_CODEPAGE_857 NLS_CODEPAGE_860 NLS_CODEPAGE_861 NLS_CODEPAGE_862 NLS_CODEPAGE_863 NLS_CODEPAGE_864 NLS_CODEPAGE_865 NLS_CODEPAGE_866 NLS_CODEPAGE_869 NLS_CODEPAGE_874 NLS_CODEPAGE_932 NLS_CODEPAGE_936 NLS_CODEPAGE_949 NLS_CODEPAGE_950 NLS_ISO8859_13 NLS_ISO8859_14 NLS_ISO8859_15 NLS_ISO8859_2 NLS_ISO8859_3 NLS_ISO8859_4 NLS_ISO8859_5 NLS_ISO8859_6 NLS_ISO8859_7 NLS_ISO8859_8 NLS_ISO8859_9 NLS_KOI8_R NLS_KOI8_U NLS_MAC_CELTIC NLS_MAC_CENTEURO NLS_MAC_CROATIAN NLS_MAC_CYRILLIC NLS_MAC_GAELIC NLS_MAC_GREEK NLS_MAC_ICELAND NLS_MAC_INUIT NLS_MAC_ROMAN NLS_MAC_ROMANIAN NLS_MAC_TURKISH NLS_UCS2_UTILS NOP_USB_XCEIV NOZOMI NTFS3_FS NTFS3_FS_POSIX_ACL NTFS3_LZX_XPRESS NULL_TTY NUMA_BALANCING NUMA_BALANCING_DEFAULT_ENABLED NUMA_EMU NUMA_KEEP_MEMINFO NVDIMM_DAX NVDIMM_KEYS NVDIMM_PFN NVME_CORE NVME_FABRICS NVME_FC NVME_MULTIPATH NVME_RDMA NVME_TARGET NVME_TARGET_FC NVME_TARGET_FCLOOP NVME_TARGET_LOOP NVME_TARGET_RDMA NVME_TARGET_TCP NVME_TCP N_GSM N_HDLC OCFS2_DEBUG_FS OCFS2_FS OCFS2_FS_O2CB OCFS2_FS_STATS OCFS2_FS_USERSPACE_CLUSTER OF_GPIO OF_PMEM OMFS_FS OPENVSWITCH OPENVSWITCH_GENEVE OPENVSWITCH_GRE OPENVSWITCH_VXLAN ORANGEFS_FS OSF_PARTITION OVERLAY_FS OVERLAY_FS_DEBUG OVERLAY_FS_INDEX OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW OVERLAY_FS_REDIRECT_DIR PACKET_DIAG PAGE_IDLE_FLAG PAGE_POOL PAGE_REPORTING PAHOLE_HAS_BTF_TAG PAHOLE_HAS_LANG_EXCLUDE PAHOLE_HAS_SPLIT_BTF PARPORT PARPORT_NOT_PC PARTITION_ADVANCED PCCARD PCCARD_NONSTATIC PCIEAER PCI_ENDPOINT PCI_IOV PCMCIA PCMCIA_LOAD_CIS PERCPU_STATS PERSISTENT_KEYRINGS PHONET PHYLINK PHY_CPCAP_USB PHY_QCOM_USB_HS PHY_QCOM_USB_HSIC PHY_SAMSUNG_USB2 PHY_TUSB1210 PKCS7_TEST_KEY PKCS8_PRIVATE_KEY_PARSER PM_CLK PNFS_BLOCK PNFS_FILE_LAYOUT PNFS_FLEXFILE_LAYOUT PPP PPPOATM PPPOE PPPOE_HASH_BITS_4 PPPOL2TP PPP_ASYNC PPP_BSDCOMP PPP_DEFLATE PPP_FILTER PPP_MPPE PPP_MULTILINK PPP_SYNC_TTY PPTP PREEMPT PREEMPT_NOTIFIERS PROC_CHILDREN PSI PSTORE PSTORE_COMPRESS QCOM_QMI_HELPERS QNX4FS_FS QNX6FS_FS QRTR QRTR_TUN R8712U RADIO_ADAPTERS RADIO_SHARK RADIO_SHARK2 RADIO_TEA575X RAID6_PQ RAID_ATTRS RC_ATI_REMOTE RC_CORE RC_DEVICES RDMA_RXE RDMA_SIW RDS RDS_RDMA RDS_TCP READ_ONLY_THP_FOR_FS REALTEK_AUTOPM REED_SOLOMON REED_SOLOMON_DEC8 REGMAP REGMAP_I2C REGMAP_IRQ REGMAP_MMIO REGMAP_SPI REGULATOR REGULATOR_TWL4030 REISERFS_FS REISERFS_FS_POSIX_ACL REISERFS_FS_SECURITY REISERFS_FS_XATTR REISERFS_PROC_INFO RESET_CONTROLLER RFKILL RFKILL_INPUT RFKILL_LEDS RMI4_2D_SENSOR RMI4_CORE RMI4_F03 RMI4_F03_SERIO RMI4_F11 RMI4_F12 RMI4_F30 ROMFS_BACKED_BY_BOTH ROMFS_FS ROMFS_ON_BLOCK ROMFS_ON_MTD ROSE RTC_DRV_HID_SENSOR_TIME RXKAD SCHED_CORE SCREEN_INFO SCSI_FC_ATTRS SCSI_HPSA SCSI_ISCSI_ATTRS SCSI_LOGGING SCSI_NETLINK SCSI_SAS_ATA SCSI_SAS_ATTRS SCSI_SAS_LIBSAS SCSI_SCAN_ASYNC SCSI_SRP_ATTRS SCTP_COOKIE_HMAC_MD5 SCTP_COOKIE_HMAC_SHA1 SCTP_DEFAULT_COOKIE_HMAC_MD5 SECONDARY_TRUSTED_KEYRING SECURITY_INFINIBAND SECURITY_NETWORK_XFRM SECURITY_SMACK_NETFILTER SERIAL_DEV_BUS SERIAL_DEV_CTRL_TTYPORT SERIAL_MCTRL_GPIO SGI_PARTITION SIGNATURE SIGNED_PE_FILE_VERIFICATION SLHC SLIP SLIP_COMPRESSED SLIP_MODE_SLIP6 SLIP_SMART SMARTJOYPLUS_FF SMBFS SMC SMC_DIAG SMSC_PHY SMS_SIANO_MDTV SMS_SIANO_RC SMS_USB_DRV SND SND_ALOOP SND_BCD2000 SND_CTL_FAST_LOOKUP SND_CTL_LED SND_DEBUG SND_DMA_SGBUF SND_DRIVERS SND_DUMMY SND_DYNAMIC_MINORS SND_HDA SND_HDA_CODEC_ANALOG SND_HDA_CODEC_CA0110 SND_HDA_CODEC_CA0132 SND_HDA_CODEC_CIRRUS SND_HDA_CODEC_CMEDIA SND_HDA_CODEC_CONEXANT SND_HDA_CODEC_HDMI SND_HDA_CODEC_REALTEK SND_HDA_CODEC_SI3054 SND_HDA_CODEC_SIGMATEL SND_HDA_CODEC_VIA SND_HDA_COMPONENT SND_HDA_CORE SND_HDA_GENERIC SND_HDA_GENERIC_LEDS SND_HDA_HWDEP SND_HDA_I915 SND_HDA_INPUT_BEEP SND_HDA_INTEL SND_HDA_PATCH_LOADER SND_HDA_RECONFIG SND_HDA_SCODEC_COMPONENT SND_HRTIMER SND_HWDEP SND_INTEL_DSP_CONFIG SND_INTEL_NHLT SND_INTEL_SOUNDWIRE_ACPI SND_JACK SND_JACK_INPUT_DEV SND_MIXER_OSS SND_OSSEMUL SND_PCI SND_PCM SND_PCMCIA SND_PCM_OSS SND_PCM_OSS_PLUGINS SND_PCM_TIMER SND_PCM_XRUN_DEBUG SND_PROC_FS SND_RAWMIDI SND_SEQUENCER SND_SEQUENCER_OSS SND_SEQ_DEVICE SND_SEQ_DUMMY SND_SEQ_HRTIMER_DEFAULT SND_SEQ_MIDI SND_SEQ_MIDI_EVENT SND_SEQ_VIRMIDI SND_SOC SND_SOC_I2C_AND_SPI SND_SUPPORT_OLD_API SND_TIMER SND_USB SND_USB_6FIRE SND_USB_AUDIO SND_USB_AUDIO_USE_MEDIA_CONTROLLER SND_USB_CAIAQ SND_USB_CAIAQ_INPUT SND_USB_HIFACE SND_USB_LINE6 SND_USB_POD SND_USB_PODHD SND_USB_TONEPORT SND_USB_UA101 SND_USB_US122L SND_USB_USX2Y SND_USB_VARIAX SND_VERBOSE_PROCFS SND_VIRMIDI SND_VIRTIO SND_VMASTER SND_X86 SOCK_VALIDATE_XMIT SOLARIS_X86_PARTITION SONY_FF SOUND SOUNDWIRE SOUND_OSS_CORE SOUND_OSS_CORE_PRECLAIM SPI SPI_DLN2 SPI_DYNAMIC SPI_MASTER SQUASHFS SQUASHFS_4K_DEVBLK_SIZE SQUASHFS_COMPILE_DECOMP_SINGLE SQUASHFS_DECOMP_SINGLE SQUASHFS_FILE_DIRECT SQUASHFS_LZ4 SQUASHFS_LZO SQUASHFS_XATTR SQUASHFS_XZ SQUASHFS_ZLIB SQUASHFS_ZSTD SSB SSB_PCIHOST_POSSIBLE SSB_PCMCIAHOST_POSSIBLE SSB_SDIOHOST_POSSIBLE STAGING STP STREAM_PARSER SUNRPC_BACKCHANNEL SUN_PARTITION SW_SYNC SYSFB SYSV68_PARTITION SYSV_FS TABLET_USB_ACECAD TABLET_USB_AIPTEK TABLET_USB_HANWANG TABLET_USB_KBTAB TABLET_USB_PEGASUS TAHVO_USB TAHVO_USB_HOST_BY_DEFAULT TASKS_TRACE_RCU TCG_CRB TCG_TIS TCG_TIS_CORE TCG_TPM TCP_CONG_BBR TCP_CONG_BIC TCP_CONG_CDG TCP_CONG_DCTCP TCP_CONG_HSTCP TCP_CONG_HTCP TCP_CONG_HYBLA TCP_CONG_ILLINOIS TCP_CONG_LP TCP_CONG_NV TCP_CONG_SCALABLE TCP_CONG_VEGAS TCP_CONG_VENO TCP_CONG_WESTWOOD TCP_CONG_YEAH TEXTSEARCH TEXTSEARCH_BM TEXTSEARCH_FSM TEXTSEARCH_KMP THERMAL_NETLINK THP_SWAP THRUSTMASTER_FF TIPC TIPC_CRYPTO TIPC_DIAG TIPC_MEDIA_IB TIPC_MEDIA_UDP TLS TLS_TOE TMPFS_QUOTA TOUCHSCREEN_SUR40 TOUCHSCREEN_USB_3M TOUCHSCREEN_USB_COMPOSITE TOUCHSCREEN_USB_DMC_TSC10 TOUCHSCREEN_USB_E2I TOUCHSCREEN_USB_EASYTOUCH TOUCHSCREEN_USB_EGALAX TOUCHSCREEN_USB_ELO TOUCHSCREEN_USB_ETT_TC45USB TOUCHSCREEN_USB_ETURBO TOUCHSCREEN_USB_GENERAL_TOUCH TOUCHSCREEN_USB_GOTOP TOUCHSCREEN_USB_GUNZE TOUCHSCREEN_USB_IDEALTEK TOUCHSCREEN_USB_IRTOUCH TOUCHSCREEN_USB_ITM TOUCHSCREEN_USB_JASTEC TOUCHSCREEN_USB_NEXIO TOUCHSCREEN_USB_PANJIT TOUCHSCREEN_USB_ZYTRONIC TRANSPARENT_HUGEPAGE TRANSPARENT_HUGEPAGE_MADVISE TTPCI_EEPROM TTY_PRINTK TUN_VNET_CROSS_LE TWL4030_CORE TYPEC TYPEC_FUSB302 TYPEC_TCPCI TYPEC_TCPM TYPEC_TPS6598X TYPEC_UCSI UBIFS_ATIME_SUPPORT UBIFS_FS UBIFS_FS_ADVANCED_COMPR UBIFS_FS_LZO UBIFS_FS_SECURITY UBIFS_FS_XATTR UBIFS_FS_ZLIB UBIFS_FS_ZSTD UCSI_ACPI UDF_FS UDMABUF UFS_FS UFS_FS_WRITE UHID ULTRIX_PARTITION UNICODE UNIXWARE_DISKLABEL UNIX_DIAG USB4 USB4_NET USBIP_CORE USBIP_HOST USBIP_VHCI_HCD USBIP_VUDC USBPCWATCHDOG USB_ACM USB_ADUTUX USB_AIRSPY USB_ALI_M5632 USB_AN2720 USB_APPLEDISPLAY USB_ARMLINUX USB_BDC_UDC USB_BELKIN USB_C67X00_HCD USB_CATC USB_CDC_PHONET USB_CHAOSKEY USB_CHIPIDEA USB_CHIPIDEA_HOST USB_CHIPIDEA_PCI USB_CHIPIDEA_UDC USB_CONFIGFS USB_CONFIGFS_ACM USB_CONFIGFS_ECM USB_CONFIGFS_ECM_SUBSET USB_DWC2 USB_GADGET USB_MUSB_HDRC USB_NET_CDC_SUBSET USB_ROLE_SWITCH USB_STORAGE_REALTEK USB_ULPI_BUS USB_USBNET VIDEO_DEV VXLAN WIRELESS WLAN ZONE_DEVICE] disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed picked [v6.8 v6.7 v6.6 v6.4 v6.2 v6.0 v5.18 v5.16 v5.13 v5.10 v5.7 v5.4 v5.1 v4.19] out of 31 release tags testing release v6.8 testing commit e8f897f4afef0031fe618a8e94127a0934896aba gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0fbaa87aaff05289f633797dba9f5d653060969eba09b6db62be2a282dd52a23 all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] testing release v6.7 testing commit 0dd3ee31125508cd67f7e7172247f05b7fd1753a gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 404f8bd72d53d13c88e3e79f446934a31993692ac74f5c33219729731291aadd all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] testing release v6.6 testing commit ffc253263a1375a65fa6c9f62a893e9767fbebfa gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c41086d221ef8a2f99162c790d11df974b2f7e3537d723a344611e74495f574e all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] testing release v6.4 testing commit 6995e2de6891c724bfeb2db33d7b87775f913ad1 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ab4dc43c1f860902a175ab52d22073c7fe663a5e3f639892bf0513676320bb50 all runs: OK false negative chance: 0.000 # git bisect start ffc253263a1375a65fa6c9f62a893e9767fbebfa 6995e2de6891c724bfeb2db33d7b87775f913ad1 Bisecting: 14974 revisions left to test after this (roughly 14 steps) [692f5510159c79bfa312a4e27a15e266232bfb4c] Merge tag 'asoc-v6.6' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus testing commit 692f5510159c79bfa312a4e27a15e266232bfb4c gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ce0048ba900317d12faa4560260a035624f660dfffb4f9709548e749b6b29720 all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 692f5510159c79bfa312a4e27a15e266232bfb4c Bisecting: 7678 revisions left to test after this (roughly 13 steps) [b775d6c5859affe00527cbe74263de05cfe6b9f9] Merge tag 'mips_6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux testing commit b775d6c5859affe00527cbe74263de05cfe6b9f9 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0705af4c168028c2cb83fe195229c2e47cc1fd30715f0b3476007172d41ed7ed all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad b775d6c5859affe00527cbe74263de05cfe6b9f9 Bisecting: 3061 revisions left to test after this (roughly 12 steps) [3a8a670eeeaa40d87bd38a587438952741980c18] Merge tag 'net-next-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next testing commit 3a8a670eeeaa40d87bd38a587438952741980c18 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 409af63c6c67327642040e7c727c9bb8f3d5d42b540674c332fa24466c71fd0a all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 3a8a670eeeaa40d87bd38a587438952741980c18 Bisecting: 2103 revisions left to test after this (roughly 11 steps) [6e17c6de3ddf3073741d9c91a796ee696914d8a0] Merge tag 'mm-stable-2023-06-24-19-15' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm testing commit 6e17c6de3ddf3073741d9c91a796ee696914d8a0 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 09cf13e0512de1616dcc5d7487f9c6cca7935209b165b4f7d4b88cd4f6c623bf all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 6e17c6de3ddf3073741d9c91a796ee696914d8a0 Bisecting: 1048 revisions left to test after this (roughly 10 steps) [2605e80d3438c77190f55b821c6575048c68268e] Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux testing commit 2605e80d3438c77190f55b821c6575048c68268e gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b4b4456972daa5c7eb9d5b0c194fa942682fbfcbdf9dd20753ebd7002b483cb9 all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 2605e80d3438c77190f55b821c6575048c68268e Bisecting: 665 revisions left to test after this (roughly 9 steps) [0aa69d53ac7c30f6184f88f2e310d808b32b35a5] Merge tag 'for-6.5/io_uring-2023-06-23' of git://git.kernel.dk/linux testing commit 0aa69d53ac7c30f6184f88f2e310d808b32b35a5 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e97bfba336e6a9a94eb8a15bb6702068083c82486ead37dc54a2493603f135e2 all runs: OK false negative chance: 0.000 # git bisect good 0aa69d53ac7c30f6184f88f2e310d808b32b35a5 Bisecting: 341 revisions left to test after this (roughly 8 steps) [7cffdbe3607a6cc2dc02d135e13732ec36bc4e28] Merge tag 'x86-boot-2023-06-26' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit 7cffdbe3607a6cc2dc02d135e13732ec36bc4e28 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7b2cfe2049b74c8d1a2caa21eed1cf41b8c35f1215bc05fa91765efdceffffb4 all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 7cffdbe3607a6cc2dc02d135e13732ec36bc4e28 Bisecting: 161 revisions left to test after this (roughly 7 steps) [658afed19ceed54a52b9e9e69c0791c8868ff55d] mtd: block: use a simple bool to track open for write testing commit 658afed19ceed54a52b9e9e69c0791c8868ff55d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6f4f81fee73e2ac0acef621d8d8ea5e7e7062bfb16e58d4a430ba40fe068cd24 all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 658afed19ceed54a52b9e9e69c0791c8868ff55d Bisecting: 80 revisions left to test after this (roughly 6 steps) [a4f75764d16bed317276b05a9fe2c179ef61680d] block: avoid repeated work in blk_mark_disk_dead testing commit a4f75764d16bed317276b05a9fe2c179ef61680d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8930ad666c1f7531df299ca6b3be076adc7f27d36e6833a64115b9cf18e32c52 all runs: OK false negative chance: 0.000 # git bisect good a4f75764d16bed317276b05a9fe2c179ef61680d Bisecting: 40 revisions left to test after this (roughly 5 steps) [3d2af77e31ade05ff7ccc3658c3635ec1bea0979] blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats() testing commit 3d2af77e31ade05ff7ccc3658c3635ec1bea0979 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9aa87936b452c30f59823b8d89f06dcf409ca42e1a685182d5bad7938ff02d9a all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 3d2af77e31ade05ff7ccc3658c3635ec1bea0979 Bisecting: 19 revisions left to test after this (roughly 4 steps) [73231b58b1b496d631fa0ecf9fa7f64f5a07c6e3] init: don't remove the /dev/ prefix from error messages testing commit 73231b58b1b496d631fa0ecf9fa7f64f5a07c6e3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9b6d1f068008b34934dfc270d8131d08b62d3a75b406b7714e2251aeee937d63 all runs: OK false negative chance: 0.000 # git bisect good 73231b58b1b496d631fa0ecf9fa7f64f5a07c6e3 Bisecting: 9 revisions left to test after this (roughly 3 steps) [d4a28d7defe79006e59293a4b43d518ba8483fb0] dm: remove dm_get_dev_t testing commit d4a28d7defe79006e59293a4b43d518ba8483fb0 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: cf3569e2b69b6483501a2c33ea633ecd8203481bd0eb743a776e96d489499a0a all runs: OK false negative chance: 0.000 # git bisect good d4a28d7defe79006e59293a4b43d518ba8483fb0 Bisecting: 4 revisions left to test after this (roughly 2 steps) [2577f53f42947d8ca01666e3444bb7307319ea38] block: mark early_lookup_bdev as __init testing commit 2577f53f42947d8ca01666e3444bb7307319ea38 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0f48ae20e171c36b19d9d79634537f1768295f61dde75d77b2d4338f3da832d1 all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 2577f53f42947d8ca01666e3444bb7307319ea38 Bisecting: 2 revisions left to test after this (roughly 1 step) [1e8c813b083c4122dfeaa5c3b11028331026e85d] PM: hibernate: don't use early_lookup_bdev in resume_store testing commit 1e8c813b083c4122dfeaa5c3b11028331026e85d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8396cf6c18578293d017d6c04eca49c8c16f9069e02d78e6c7498049258ff2c1 all runs: crashed: possible deadlock in seq_read_iter representative crash: possible deadlock in seq_read_iter, types: [LOCKDEP] # git bisect bad 1e8c813b083c4122dfeaa5c3b11028331026e85d Bisecting: 0 revisions left to test after this (roughly 0 steps) [7a126d5bf975f082281fb9b45d110cd49b7c3ee4] dm: only call early_lookup_bdev from early boot context testing commit 7a126d5bf975f082281fb9b45d110cd49b7c3ee4 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9db125a55f1eac42a9671312cf241d4b2e40acc60b08720773bcacb03e08e5f4 all runs: OK false negative chance: 0.000 # git bisect good 7a126d5bf975f082281fb9b45d110cd49b7c3ee4 1e8c813b083c4122dfeaa5c3b11028331026e85d is the first bad commit commit 1e8c813b083c4122dfeaa5c3b11028331026e85d Author: Christoph Hellwig Date: Wed May 31 14:55:32 2023 +0200 PM: hibernate: don't use early_lookup_bdev in resume_store resume_store is a sysfs attribute written during normal kernel runtime, and it should not use the early_lookup_bdev API that bypasses all normal path based permission checking, and might cause problems with certain container environments renaming devices. Switch to lookup_bdev, which does a normal path lookup instead, and fall back to trying to parse a numeric dev_t just like early_lookup_bdev did. Note that this strictly speaking changes the kernel ABI as the PARTUUID= and PARTLABEL= style syntax is now not available during a running systems. They never were intended for that, but this breaks things we'll have to figure out a way to make them available again. But if avoidable in any way I'd rather avoid that. Fixes: 421a5fa1a6cf ("PM / hibernate: use name_to_dev_t to parse resume") Signed-off-by: Christoph Hellwig Acked-by: Rafael J. Wysocki Link: https://lore.kernel.org/r/20230531125535.676098-22-hch@lst.de Signed-off-by: Jens Axboe kernel/power/hibernate.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) accumulated error probability: 0.00 culprit signature: 8396cf6c18578293d017d6c04eca49c8c16f9069e02d78e6c7498049258ff2c1 parent signature: 9db125a55f1eac42a9671312cf241d4b2e40acc60b08720773bcacb03e08e5f4 revisions tested: 26, total time: 4h7m51.21515206s (build: 1h44m39.842872715s, test: 2h13m29.285144246s) first bad commit: 1e8c813b083c4122dfeaa5c3b11028331026e85d PM: hibernate: don't use early_lookup_bdev in resume_store recipients (to): ["axboe@kernel.dk" "hch@lst.de" "rafael@kernel.org"] recipients (cc): [] crash: possible deadlock in seq_read_iter ====================================================== WARNING: possible circular locking dependency detected 6.4.0-rc2-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/2623 is trying to acquire lock: ffff888102f3f440 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0x3c/0x420 fs/seq_file.c:182 but task is already holding lock: ffff888103664068 (&pipe->mutex/1){+.+.}-{3:3}, at: splice_file_to_pipe+0x25/0x140 fs/splice.c:1107 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&pipe->mutex/1){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:747 iter_file_splice_write+0xb9/0x430 fs/splice.c:710 ovl_splice_write+0x148/0x220 fs/overlayfs/file.c:473 do_splice_from fs/splice.c:841 [inline] do_splice+0x52d/0x8e0 fs/splice.c:1171 __do_splice fs/splice.c:1249 [inline] __do_sys_splice fs/splice.c:1460 [inline] __se_sys_splice+0x18f/0x240 fs/splice.c:1442 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x46/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x73/0xdd -> #3 (sb_writers#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1494 [inline] sb_start_write+0x34/0xd0 include/linux/fs.h:1569 mnt_want_write+0x12/0x40 fs/namespace.c:394 ovl_create_object+0x3e/0x100 fs/overlayfs/dir.c:630 lookup_open fs/namei.c:3492 [inline] open_last_lookups fs/namei.c:3560 [inline] path_openat+0x520/0xd50 fs/namei.c:3788 do_filp_open+0xac/0x150 fs/namei.c:3818 do_sys_openat2+0x89/0x160 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_open fs/open.c:1380 [inline] __se_sys_open fs/open.c:1376 [inline] __x64_sys_open+0x7a/0xa0 fs/open.c:1376 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x46/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x73/0xdd -> #2 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}: down_read+0x4a/0x440 kernel/locking/rwsem.c:1520 inode_lock_shared include/linux/fs.h:785 [inline] lookup_slow+0x20/0x50 fs/namei.c:1706 walk_component+0xda/0xf0 fs/namei.c:1998 lookup_last fs/namei.c:2455 [inline] path_lookupat+0x45/0x100 fs/namei.c:2479 filename_lookup+0xd9/0x1f0 fs/namei.c:2508 kern_path+0x2a/0x80 fs/namei.c:2606 lookup_bdev+0x4a/0xc0 block/bdev.c:938 resume_store+0xb2/0x240 kernel/power/hibernate.c:1181 kernfs_fop_write_iter+0x12a/0x1b0 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:1868 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x255/0x2c0 fs/read_write.c:584 ksys_write+0x70/0xe0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x46/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x73/0xdd -> #1 (&of->mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:747 kernfs_seq_start+0x21/0xf0 fs/kernfs/file.c:154 seq_read_iter+0x11a/0x420 fs/seq_file.c:225 call_read_iter include/linux/fs.h:1862 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x250/0x2b0 fs/read_write.c:470 ksys_read+0x70/0xe0 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x46/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x73/0xdd -> #0 (&p->lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3108 [inline] check_prevs_add kernel/locking/lockdep.c:3227 [inline] validate_chain kernel/locking/lockdep.c:3842 [inline] __lock_acquire+0x1260/0x2590 kernel/locking/lockdep.c:5074 lock_acquire+0xea/0x270 kernel/locking/lockdep.c:5691 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:747 seq_read_iter+0x3c/0x420 fs/seq_file.c:182 call_read_iter include/linux/fs.h:1862 [inline] copy_splice_read+0x1c8/0x320 fs/splice.c:366 splice_file_to_pipe+0xc0/0x140 fs/splice.c:1110 do_sendfile+0x19f/0x410 fs/read_write.c:1261 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64+0xab/0xe0 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x46/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x73/0xdd other info that might help us debug this: Chain exists of: &p->lock --> sb_writers#4 --> &pipe->mutex/1 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&pipe->mutex/1); lock(sb_writers#4); lock(&pipe->mutex/1); lock(&p->lock); *** DEADLOCK *** 1 lock held by syz-executor.0/2623: #0: ffff888103664068 (&pipe->mutex/1){+.+.}-{3:3}, at: splice_file_to_pipe+0x25/0x140 fs/splice.c:1107 stack backtrace: CPU: 0 PID: 2623 Comm: syz-executor.0 Not tainted 6.4.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xe0 lib/dump_stack.c:106 check_noncircular+0x10c/0x120 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3108 [inline] check_prevs_add kernel/locking/lockdep.c:3227 [inline] validate_chain kernel/locking/lockdep.c:3842 [inline] __lock_acquire+0x1260/0x2590 kernel/locking/lockdep.c:5074 lock_acquire+0xea/0x270 kernel/locking/lockdep.c:5691 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:747 seq_read_iter+0x3c/0x420 fs/seq_file.c:182 call_read_iter include/linux/fs.h:1862 [inline] copy_splice_read+0x1c8/0x320 fs/splice.c:366 splice_file_to_pipe+0xc0/0x140 fs/splice.c:1110 do_sendfile+0x19f/0x410 fs/read_write.c:1261 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64+0xab/0xe0 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x46/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x73/0xdd RIP: 0033:0x7fb98e47dd69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb98f1650c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fb98e5ac050 RCX: 00007fb98e47dd69 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006 RBP: 00007fb98e4ca49e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fb98e5ac050 R15: 00007ffc86b14338