ci2 starts bisection 2024-04-03 19:15:54.197151851 +0000 UTC m=+15040.033576264 bisecting cause commit starting from fe46a7dd189e25604716c03576d05ac8a5209743 building syzkaller on 51c4dcff83b0574620c280cc5130ef59cc4a2e32 ensuring issue is reproducible on original commit fe46a7dd189e25604716c03576d05ac8a5209743 testing commit fe46a7dd189e25604716c03576d05ac8a5209743 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5bd83dabb6462773cc6a57079dd51defba2300fb456b0e3049f980854237f9d9 all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit fe46a7dd189e25604716c03576d05ac8a5209743 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c804c73eec96bcd6d80fbf0a352745f4ef0ab012f9e34e856181424a044b445d all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed kconfig minimization: base=3932 full=7979 leaves diff=2024 split chunks (needed=false): <2024> split chunk #0 of len 2024 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 fe46a7dd189e25604716c03576d05ac8a5209743 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 141b93764238f9a569d14a2cbd90e6cfec18b68ee553b0d37740b0e2c1406301 all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit fe46a7dd189e25604716c03576d05ac8a5209743 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ad2e8a47c9407904748a34948b25d75f77fbce743d6640307be6cfdaed25616b all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, 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 fe46a7dd189e25604716c03576d05ac8a5209743 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 59d9e5aff48967999e5c5836bd1d9a056f1870a02bd96e89fd7d2dd7fb33c59f all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP HANG LEAK], they are not needed testing commit fe46a7dd189e25604716c03576d05ac8a5209743 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 007468b0aba5b5169d08f315cd50f44f40792d85327699351f0af4b766ce16d9 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit fe46a7dd189e25604716c03576d05ac8a5209743 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: bb43e1a4869f20e15b2371f652e9fde39ba7a018ebec3b1c6b47022fd520a1dc all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, types: [LOCKDEP] the chunk can be dropped minimized to 405 configs; suspects: [AF_RXRPC ARCH_ENABLE_MEMORY_HOTREMOVE ATM AX25 CFG80211 CMA DAX DLM DVB_CORE ENCRYPTED_KEYS EXTCON GENEVE GPIOLIB HAMRADIO HAVE_CLK HAVE_PAGE_SIZE_4KB 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_ADVANCED NETFILTER_CONNCOUNT NET_IPGRE NET_IPGRE_DEMUX NFS_V4_1 NF_CONNTRACK_SNMP NF_NAT_SNMP_BASIC NF_NAT_TFTP 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 PAGE_SIZE_4KB 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 PRISM2_USB 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 UBSAN_SIGNED_WRAP 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_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 [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], 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: 89617703a03e7b69534fdf06c1902bc2c4773d787b21c34c6c3d1e6ac01c3f63 all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, 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: 53422a39322f473ed004a1edde9dae330f058e41147996744b28d1864a109df2 all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, 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: 3da86390a06a1f66710fe3c5830efa57ef8219faf905e1f3ba2f59c939cfc79b all runs: OK false negative chance: 0.000 # git bisect start 0dd3ee31125508cd67f7e7172247f05b7fd1753a ffc253263a1375a65fa6c9f62a893e9767fbebfa Bisecting: 9251 revisions left to test after this (roughly 13 steps) [deefd5024f0772cf56052ace9a8c347dc70bcaf3] Merge tag 'vfio-v6.7-rc1' of https://github.com/awilliam/linux-vfio testing commit deefd5024f0772cf56052ace9a8c347dc70bcaf3 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 078a29dbe5ddb491b0a960d14a2fa8c13edfd35aec660ad2af8775d51d0228e9 all runs: OK false negative chance: 0.000 # git bisect good deefd5024f0772cf56052ace9a8c347dc70bcaf3 Bisecting: 4695 revisions left to test after this (roughly 12 steps) [1f24458a1071f006e3f7449c08ae0f12af493923] Merge tag 'tty-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty testing commit 1f24458a1071f006e3f7449c08ae0f12af493923 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 208268c36ee2e6ad7243b165791e3c3cf23b202987313adba794410b4e64e61f all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, types: [LOCKDEP] # git bisect bad 1f24458a1071f006e3f7449c08ae0f12af493923 Bisecting: 2275 revisions left to test after this (roughly 11 steps) [43468456c95b9e13c0592de51a9a530caa525c1f] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma testing commit 43468456c95b9e13c0592de51a9a530caa525c1f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: eefa03c907e7cdebb8a13754e48b8487c4a28064e1bf9c64791c98de14f1debd all runs: OK false negative chance: 0.000 # git bisect good 43468456c95b9e13c0592de51a9a530caa525c1f Bisecting: 1046 revisions left to test after this (roughly 10 steps) [7ab89417ed235f56d84c7893d38d4905e38d2692] Merge tag 'perf-tools-for-v6.7-1-2023-11-01' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools testing commit 7ab89417ed235f56d84c7893d38d4905e38d2692 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c0aff55fab5d614657d4958ed6c4d8b9cf0301d2d390c0fb4c0e90a2374d8ea0 all runs: OK false negative chance: 0.000 # git bisect good 7ab89417ed235f56d84c7893d38d4905e38d2692 Bisecting: 474 revisions left to test after this (roughly 9 steps) [d99b91a99be430be45413052bb428107c435918b] Merge tag 'char-misc-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc testing commit d99b91a99be430be45413052bb428107c435918b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 980ceaec42a7e14435e90c3f795ae0b2a08c13249eca702a2eb24b89dd2bec1f all runs: OK false negative chance: 0.000 # git bisect good d99b91a99be430be45413052bb428107c435918b Bisecting: 237 revisions left to test after this (roughly 8 steps) [75c1e5968f5c549c148c253ab331130aa3a74f33] staging: rtl8192e: Fix line break issue at priv->rx_buf[priv->rx_idx] testing commit 75c1e5968f5c549c148c253ab331130aa3a74f33 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c625c943d610b0ff4bc272e63b97f62833ee6ae56e7d13d98687b7f36758d348 all runs: OK false negative chance: 0.000 # git bisect good 75c1e5968f5c549c148c253ab331130aa3a74f33 Bisecting: 118 revisions left to test after this (roughly 7 steps) [fb110d1b1c52277f6bf1a6918c1ac8774528eee5] serial: 8250_pci1xxxx: Annotate struct pci1xxxx_8250 with __counted_by testing commit fb110d1b1c52277f6bf1a6918c1ac8774528eee5 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4489da7c9236de980ff7f56934631e0d8f99ba3cfee3246b9403f6b23eccdacc all runs: OK false negative chance: 0.000 # git bisect good fb110d1b1c52277f6bf1a6918c1ac8774528eee5 Bisecting: 59 revisions left to test after this (roughly 6 steps) [2c6fec1e1532f15350be7e14ba6b88a39d289fe4] tty: 8250: Add support for Brainboxes UP cards testing commit 2c6fec1e1532f15350be7e14ba6b88a39d289fe4 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b3cce297e0dfa8f837d4572bbefb096f9ee11af5ce4f01b13a1ee851572e83cb all runs: OK false negative chance: 0.000 # git bisect good 2c6fec1e1532f15350be7e14ba6b88a39d289fe4 Bisecting: 37 revisions left to test after this (roughly 5 steps) [b06f58ad8e8c4154bc88d83b4fd70f74ede50193] Merge tag 'driver-core-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core testing commit b06f58ad8e8c4154bc88d83b4fd70f74ede50193 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0c1d8c48517f0bac44035a88b850eeff6030c86d4384fbf7120955b7635040e1 all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, types: [LOCKDEP] # git bisect bad b06f58ad8e8c4154bc88d83b4fd70f74ede50193 Bisecting: 10 revisions left to test after this (roughly 4 steps) [0fedefd4c4e33dd24f726b13b5d7c143e2b483be] kernfs: sysfs: support custom llseek method for sysfs entries testing commit 0fedefd4c4e33dd24f726b13b5d7c143e2b483be gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e4dbb740442376f8cd4975877106bbca2106cbbd4b015b07d66baca86ba49140 all runs: crashed: possible deadlock in kernfs_fop_llseek representative crash: possible deadlock in kernfs_fop_llseek, types: [LOCKDEP] # git bisect bad 0fedefd4c4e33dd24f726b13b5d7c143e2b483be Bisecting: 5 revisions left to test after this (roughly 3 steps) [a083c755e136844a934bc9b4416cd23b5c19c617] devres: rename the first parameter of devm_add_action(_or_reset) testing commit a083c755e136844a934bc9b4416cd23b5c19c617 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 25451b0614d8f373f4666f3f2182174581e99d3398aea853dbb39cc6a3a1a4c4 all runs: OK false negative chance: 0.000 # git bisect good a083c755e136844a934bc9b4416cd23b5c19c617 Bisecting: 2 revisions left to test after this (roughly 2 steps) [98ad1dd06a02096fff6c65703a85b9f3c3de1a7d] drivers: base: test: Make property entry API test modular testing commit 98ad1dd06a02096fff6c65703a85b9f3c3de1a7d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0d546060c81b96e35113fa944ca33c789e3f2037a1fa63d4e5a9cdb5868e0aa2 all runs: OK false negative chance: 0.000 # git bisect good 98ad1dd06a02096fff6c65703a85b9f3c3de1a7d Bisecting: 0 revisions left to test after this (roughly 1 step) [7360a48bd0f5e62b2d00c387d5d3f2821eb290ce] debugfs: Fix __rcu type comparison warning testing commit 7360a48bd0f5e62b2d00c387d5d3f2821eb290ce gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e59f74727c8aeb22854c57f023dfec81764d88998d91ce297e702453a18bff63 all runs: OK false negative chance: 0.000 # git bisect good 7360a48bd0f5e62b2d00c387d5d3f2821eb290ce 0fedefd4c4e33dd24f726b13b5d7c143e2b483be is the first bad commit commit 0fedefd4c4e33dd24f726b13b5d7c143e2b483be Author: Valentine Sinitsyn Date: Mon Sep 25 11:40:12 2023 +0300 kernfs: sysfs: support custom llseek method for sysfs entries As of now, seeking in sysfs files is handled by generic_file_llseek(). There are situations where one may want to customize seeking logic: - Many sysfs entries are fixed files while generic_file_llseek() accepts past-the-end positions. Not only being useless by itself, this also means a bug in userspace code will trigger not at lseek(), but at some later point making debugging harder. - generic_file_llseek() relies on f_mapping->host to get the file size which might not be correct for all sysfs entries. See commit 636b21b50152 ("PCI: Revoke mappings like devmem") as an example. Implement llseek method to override this behavior at sysfs attribute level. The method is optional, and if it is absent, generic_file_llseek() is called to preserve backwards compatibility. Signed-off-by: Valentine Sinitsyn Link: https://lore.kernel.org/r/20230925084013.309399-1-valesini@yandex-team.ru Signed-off-by: Greg Kroah-Hartman fs/kernfs/file.c | 29 ++++++++++++++++++++++++++++- fs/sysfs/file.c | 13 +++++++++++++ include/linux/kernfs.h | 1 + include/linux/sysfs.h | 2 ++ 4 files changed, 44 insertions(+), 1 deletion(-) accumulated error probability: 0.00 culprit signature: e4dbb740442376f8cd4975877106bbca2106cbbd4b015b07d66baca86ba49140 parent signature: e59f74727c8aeb22854c57f023dfec81764d88998d91ce297e702453a18bff63 revisions tested: 23, total time: 4h34m2.539873293s (build: 1h49m13.410337917s, test: 2h34m58.029497694s) first bad commit: 0fedefd4c4e33dd24f726b13b5d7c143e2b483be kernfs: sysfs: support custom llseek method for sysfs entries recipients (to): ["gregkh@linuxfoundation.org" "valesini@yandex-team.ru"] recipients (cc): [] crash: possible deadlock in kernfs_fop_llseek ====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc4-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/2651 is trying to acquire lock: ffff888107a57688 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_llseek+0x33/0xc0 fs/kernfs/file.c:916 but task is already holding lock: ffff88810ae97f30 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_inode_lock fs/overlayfs/overlayfs.h:597 [inline] ffff88810ae97f30 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_llseek+0xe5/0x1a0 fs/overlayfs/file.c:223 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ovl_i_lock_key[depth]){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:747 ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:602 [inline] ovl_nlink_start+0x99/0x110 fs/overlayfs/util.c:1061 ovl_do_remove+0xa0/0x410 fs/overlayfs/dir.c:902 vfs_rmdir+0x9f/0x170 fs/namei.c:4203 do_rmdir+0x15f/0x210 fs/namei.c:4262 __do_sys_rmdir fs/namei.c:4281 [inline] __se_sys_rmdir fs/namei.c:4279 [inline] __x64_sys_rmdir+0x1e/0x30 fs/namei.c:4279 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+0x6f/0xd9 -> #2 (sb_writers#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1571 [inline] sb_start_write+0x34/0xd0 include/linux/fs.h:1646 mnt_want_write+0x12/0x40 fs/namespace.c:403 ovl_do_remove+0x7b/0x410 fs/overlayfs/dir.c:894 vfs_rmdir+0x9f/0x170 fs/namei.c:4203 do_rmdir+0x15f/0x210 fs/namei.c:4262 __do_sys_rmdir fs/namei.c:4281 [inline] __se_sys_rmdir fs/namei.c:4279 [inline] __x64_sys_rmdir+0x1e/0x30 fs/namei.c:4279 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+0x6f/0xd9 -> #1 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}: down_read+0x4a/0x440 kernel/locking/rwsem.c:1520 inode_lock_shared include/linux/fs.h:812 [inline] lookup_slow+0x20/0x50 fs/namei.c:1709 walk_component+0xda/0xf0 fs/namei.c:2001 lookup_last fs/namei.c:2458 [inline] path_lookupat+0x45/0x100 fs/namei.c:2482 filename_lookup+0xd9/0x1f0 fs/namei.c:2511 kern_path+0x2a/0x80 fs/namei.c:2609 lookup_bdev+0x4a/0xc0 block/bdev.c:926 resume_store+0x9b/0x230 kernel/power/hibernate.c:1177 kernfs_fop_write_iter+0x12a/0x1b0 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:1956 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x271/0x2f0 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+0x6f/0xd9 -> #0 (&of->mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x11f9/0x2490 kernel/locking/lockdep.c:5136 lock_acquire+0xea/0x270 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:747 kernfs_fop_llseek+0x33/0xc0 fs/kernfs/file.c:916 ovl_llseek+0x10d/0x1a0 fs/overlayfs/file.c:227 vfs_llseek fs/read_write.c:289 [inline] ksys_lseek fs/read_write.c:302 [inline] __do_sys_lseek fs/read_write.c:313 [inline] __se_sys_lseek fs/read_write.c:311 [inline] __x64_sys_lseek+0x58/0xa0 fs/read_write.c:311 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+0x6f/0xd9 other info that might help us debug this: Chain exists of: &of->mutex --> sb_writers#4 --> &ovl_i_lock_key[depth] Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ovl_i_lock_key[depth]); lock(sb_writers#4); lock(&ovl_i_lock_key[depth]); lock(&of->mutex); *** DEADLOCK *** 2 locks held by syz-executor.0/2651: #0: ffff888103664ac8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xa1/0xc0 fs/file.c:1064 #1: ffff88810ae97f30 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_inode_lock fs/overlayfs/overlayfs.h:597 [inline] #1: ffff88810ae97f30 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_llseek+0xe5/0x1a0 fs/overlayfs/file.c:223 stack backtrace: CPU: 1 PID: 2651 Comm: syz-executor.0 Not tainted 6.6.0-rc4-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+0x119/0x140 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x11f9/0x2490 kernel/locking/lockdep.c:5136 lock_acquire+0xea/0x270 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:747 kernfs_fop_llseek+0x33/0xc0 fs/kernfs/file.c:916 ovl_llseek+0x10d/0x1a0 fs/overlayfs/file.c:227 vfs_llseek fs/read_write.c:289 [inline] ksys_lseek fs/read_write.c:302 [inline] __do_sys_lseek fs/read_write.c:313 [inline] __se_sys_lseek fs/read_write.c:311 [inline] __x64_sys_lseek+0x58/0xa0 fs/read_write.c:311 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+0x6f/0xd9 RIP: 0033:0x7fcfd147dde9 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:00007fcfd22410c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000008 RAX: ffffffffffffffda RBX: 00007fcfd15abf80 RCX: 00007fcfd147dde9 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007fcfd14ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000006 R14: 00007fcfd15abf80 R15: 00007ffd702d5738