ci starts bisection 2025-10-01 13:20:50.65696992 +0000 UTC m=+5087.220634507 bisecting cause commit starting from 50c19e20ed2ef359cf155a39c8462b0a6351b9fa building syzkaller on 65a0eece8b50b1e2fac47dce4b422ec459ff7825 ensuring issue is reproducible on original commit 50c19e20ed2ef359cf155a39c8462b0a6351b9fa testing commit 50c19e20ed2ef359cf155a39c8462b0a6351b9fa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 7337ee88948c4b3ae1a21cb4932b60054c430e26afceae303200157f0d07bb45 all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed testing commit 50c19e20ed2ef359cf155a39c8462b0a6351b9fa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: fa98e47960252a8b4c2058e37d53916316a384efc528de56a15f004b30492e04 all runs: OK false negative chance: 0.000 kconfig minimization: base=4092 full=8332 leaves diff=2165 split chunks (needed=false): <2165> split chunk #0 of len 2165 into 5 parts testing without sub-chunk 1/5 testing commit 50c19e20ed2ef359cf155a39c8462b0a6351b9fa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 862ded246325c6ac6a67f504005257d91fdcee2edcdabe61a8cb7469b947cb48 all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] the chunk can be dropped testing without sub-chunk 2/5 testing commit 50c19e20ed2ef359cf155a39c8462b0a6351b9fa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: b3c7bcbc622f89e347ee2f937820e324565ffb07e5795fcc545be3f02a8207ce all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] the chunk can be dropped testing without sub-chunk 3/5 testing commit 50c19e20ed2ef359cf155a39c8462b0a6351b9fa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 7ca3cbbf8e5ffcf86f967fbc98982afe8721c81d793c69cdceaf00a78439438d all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 testing commit 50c19e20ed2ef359cf155a39c8462b0a6351b9fa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 083ea1af8c46fd2c1214f6abffd9c920c0be447989abb931747490f01de309c9 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 testing commit 50c19e20ed2ef359cf155a39c8462b0a6351b9fa gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: d98236becbdb4b6fbaaadef313edd5cc3dbc7137113654f247d220ae6610e9c5 all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] the chunk can be dropped minimized to 433 configs; suspects: [AF_RXRPC ARCH_ENABLE_MEMORY_HOTREMOVE ARCH_SUPPORTS_SCHED_SMT ATM AX25 BT BT_BREDR BT_HIDP BXT_WC_PMIC_OPREGION CFG80211 CMA DAX DLM DRM DVB_CORE ENCRYPTED_KEYS EXTCON GENEVE GPIOLIB HAMRADIO HAVE_CLK HID_NINTENDO HID_NVIDIA_SHIELD HID_PLAYSTATION HID_SENSOR_HUB HID_SMARTJOYPLUS HID_STEAM HID_THRUSTMASTER IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_IPOIB INFINIBAND_USER_ACCESS INFINIBAND_VIRT_DMA INPUT_TABLET INPUT_TOUCHSCREEN INTEL_SCU_IPC INTEL_SOC_PMIC_BXTWC IP_SCTP L2TP LEDS_CLASS_MULTICOLOR LIBNVDIMM MAC80211 MEDIA_COMMON_OPTIONS MEDIA_DIGITAL_TV_SUPPORT MEDIA_PLATFORM_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MFD_INTEL_PMC_BXT MFD_MT6360 MFD_MT6370 MFD_RETU MMC MTD MTD_UBI NETFILTER_CONNCOUNT NET_IPGRE NET_IPGRE_DEMUX NFS_V4_1 NF_TPROXY_IPV6 NILFS2_FS NINTENDO_FF 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 NOZOMI NTFS3_FS NTFS3_FS_POSIX_ACL NTFS3_LZX_XPRESS NULL_TTY NUMA_EMU NUMA_KEEP_MEMINFO NVDIMM_DAX NVDIMM_KEYS NVDIMM_PFN NVIDIA_SHIELD_FF 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_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 PHYLINK PHY_CPCAP_USB PHY_QCOM_USB_HS PHY_QCOM_USB_HSIC PHY_SAMSUNG_USB2 PHY_TUSB1210 PKCS7_TEST_KEY PKCS8_PRIVATE_KEY_PARSER PLAYSTATION_FF PLFXLC PMIC_OPREGION PM_CLK PNFS_BLOCK PNFS_FILE_LAYOUT PNFS_FLEXFILE_LAYOUT PPP PPPOATM PPPOE PPPOE_HASH_BITS_1 PPPOL2TP PPP_ASYNC PPP_BSDCOMP PPP_DEFLATE PPP_FILTER PPP_MPPE PPP_MULTILINK PPP_SYNC_TTY PPTP PREEMPT PREEMPT_NOTIFIERS PREEMPT_RT PROC_CHILDREN PSAMPLE PSI PSTORE PSTORE_COMPRESS QCOM_QMI_HELPERS QNX4FS_FS QNX6FS_FS QRTR QRTR_TUN RADIO_ADAPTERS RADIO_SHARK RADIO_SHARK2 RADIO_TEA575X RAID6_PQ RAID_ATTRS RC_ATI_REMOTE RC_CORE RC_DEVICES RC_XBOX_DVD RDMA_RXE RDMA_SIW RDS RDS_RDMA RDS_TCP REALTEK_AUTOPM REED_SOLOMON REED_SOLOMON_DEC8 REGMAP REGMAP_I2C REGMAP_IRQ REGMAP_MMIO REGMAP_SPI REGULATOR REGULATOR_FIXED_VOLTAGE REGULATOR_TWL4030 RESET_CONTROLLER RFKILL RFKILL_INPUT RFKILL_LEDS RMI4_2D_SENSOR RMI4_CORE RMI4_F03 RMI4_F03_SERIO RMI4_F11 RMI4_F12 RMI4_F30 RMI4_F3A 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 SENSORS_AQUACOMPUTER_D5NEXT SENSORS_CORSAIR_CPRO SENSORS_CORSAIR_PSU SENSORS_GIGABYTE_WATERFORCE SENSORS_NZXT_KRAKEN2 SENSORS_NZXT_SMART2 SENSORS_POWERZ SERIAL_DEV_BUS SERIAL_DEV_CTRL_TTYPORT SERIAL_MCTRL_GPIO SGI_PARTITION SIGNATURE SIGNED_PE_FILE_VERIFICATION SKB_DECRYPTED SLHC SLIP SLIP_COMPRESSED SLIP_MODE_SLIP6 SLIP_SMART SMARTJOYPLUS_FF SMBFS SMB_SERVER SMC SMC_DIAG SMSC_PHY SMS_SDIO_DRV SMS_SIANO_DEBUGFS 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_ALC260 SND_HDA_CODEC_ALC262 SND_HDA_CODEC_ALC268 SND_HDA_CODEC_ALC269 SND_HDA_CODEC_ALC662 SND_HDA_CODEC_ALC680 SND_HDA_CODEC_ALC861 SND_HDA_CODEC_ALC861VD SND_HDA_CODEC_ALC880 SND_HDA_CODEC_ALC882 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_CS420X SND_HDA_CODEC_CS421X SND_HDA_CODEC_HDMI SND_HDA_CODEC_HDMI_ATI SND_HDA_CODEC_HDMI_GENERIC SND_HDA_CODEC_HDMI_INTEL SND_HDA_CODEC_HDMI_NVIDIA SND_HDA_CODEC_HDMI_NVIDIA_MCP SND_HDA_CODEC_HDMI_SIMPLE SND_HDA_CODEC_HDMI_TEGRA SND_HDA_CODEC_REALTEK SND_HDA_CODEC_REALTEK_LIB SND_HDA_CODEC_SI3054 SND_HDA_CODEC_SIGMATEL SND_HDA_CODEC_VIA SND_HDA_CORE SND_HDA_GENERIC SND_HDA_GENERIC_LEDS SND_HDA_HWDEP 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_ELD 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_SOC_SDCA_OPTIONAL SND_SUPPORT_OLD_API SND_TIMER SND_UMP SND_UMP_LEGACY_RAWMIDI SND_USB SND_USB_6FIRE SND_USB_AUDIO SND_USB_AUDIO_MIDI_V2 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_LJCA SPI_MASTER SQUASHFS SQUASHFS_4K_DEVBLK_SIZE SQUASHFS_COMPILE_DECOMP_MULTI SQUASHFS_DECOMP_MULTI 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 STEAM_FF STP STREAM_PARSER SUNRPC_BACKCHANNEL SUN_PARTITION SURFACE_AGGREGATOR SURFACE_AGGREGATOR_BUS SURFACE_AGGREGATOR_REGISTRY SURFACE_HID SURFACE_HID_CORE SURFACE_KBD SW_SYNC SYSFB SYSFS_SYSCALL SYSV68_PARTITION TABLET_USB_ACECAD TABLET_USB_AIPTEK TABLET_USB_HANWANG TABLET_USB_KBTAB TABLET_USB_PEGASUS TAHVO_USB TAHVO_USB_HOST_BY_DEFAULT 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 TEE TEXTSEARCH TEXTSEARCH_BM TEXTSEARCH_FSM TEXTSEARCH_KMP THRUSTMASTER_FF TIPC TIPC_CRYPTO TIPC_DIAG TIPC_MEDIA_IB TIPC_MEDIA_UDP TLS TLS_TOE TMPFS_QUOTA TOOLS_SUPPORT_RELR 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 TRACEFS_AUTOMOUNT_DEPRECATED TTPCI_EEPROM TTY_PRINTK TUN_VNET_CROSS_LE TWL4030_CORE TYPEC TYPEC_ANX7411 TYPEC_DP_ALTMODE TYPEC_FUSB302 TYPEC_HD3SS3220 TYPEC_MT6360 TYPEC_MUX_FSA4480 TYPEC_MUX_GPIO_SBU TYPEC_MUX_INTEL_PMC TYPEC_MUX_NB7VPQ904M TYPEC_MUX_PTN36502 TYPEC_MUX_WCD939X_USBSS TYPEC_NVIDIA_ALTMODE TYPEC_RT1711H TYPEC_RT1719 TYPEC_STUSB160X TYPEC_TCPCI TYPEC_TCPCI_MAXIM TYPEC_TCPCI_MT6370 TYPEC_TCPM TYPEC_TPS6598X TYPEC_UCSI TYPEC_WCOVE TYPEC_WUSB3801 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 UCSI_CCG UCSI_STM32G0 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_DWC2 USB_GADGET USB_LJCA USB_MUSB_HDRC USB_ROLE_SWITCH USB_STORAGE_REALTEK USB_ULPI_BUS VIDEO_DEV VXLAN WIRELESS WLAN WLAN_VENDOR_PURELIFI ZONE_DEVICE] picked [v6.17 v6.16 v6.15 v6.13 v6.11 v6.9 v6.7 v6.5 v6.2 v5.19 v5.16 v5.13 v5.10 v5.7 v5.4 v5.1 v4.19] out of 40 release tags testing release v6.17 testing commit e5f0a698b34ed76002dc5cff3804a61c80233a7a gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 1d076026ec3fe518e9b8c6735f2b44b56e58a76e2b935f2b839efd87f4d46ed3 all runs: OK false negative chance: 0.000 # git bisect start 50c19e20ed2ef359cf155a39c8462b0a6351b9fa e5f0a698b34ed76002dc5cff3804a61c80233a7a Bisecting: 831 revisions left to test after this (roughly 10 steps) [f3827213abae9291b7525b05e6fd29b1f0536ce6] Merge tag 'for-6.18-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux testing commit f3827213abae9291b7525b05e6fd29b1f0536ce6 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 51028639529e73adeb18976090cc5bcf76dd65f28ca8b46eafd2ec70d2d0b341 all runs: OK false negative chance: 0.000 # git bisect good f3827213abae9291b7525b05e6fd29b1f0536ce6 Bisecting: 421 revisions left to test after this (roughly 9 steps) [d8de3685f1a28722a4ba4f1f06a0987822750fb9] Merge tag 'smp-core-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit d8de3685f1a28722a4ba4f1f06a0987822750fb9 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: fdd8046b13aa84163d62fcbf9a0f98e12bed2d865d13f113a6e3fd4b44e74eb1 all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] # git bisect bad d8de3685f1a28722a4ba4f1f06a0987822750fb9 Bisecting: 213 revisions left to test after this (roughly 8 steps) [88b489385bfe3713497a63c0dcf4dd7852cf4568] Merge tag 'locking-core-2025-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit 88b489385bfe3713497a63c0dcf4dd7852cf4568 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 2070b721694c1f6ea3581b0798aa183d61938b77abd593b70161f2e1d36d6bad all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] # git bisect bad 88b489385bfe3713497a63c0dcf4dd7852cf4568 Bisecting: 90 revisions left to test after this (roughly 7 steps) [755fa5b4fb36627796af19932a432d343220ec63] Merge tag 'cgroup-for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup testing commit 755fa5b4fb36627796af19932a432d343220ec63 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: a1beb8e0c869db06678fec1fdf58ab445ecec7d8dc42a77c78bcf8c512c90fa4 all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] # git bisect bad 755fa5b4fb36627796af19932a432d343220ec63 Bisecting: 48 revisions left to test after this (roughly 6 steps) [a23cd25baed2316e50597f8b67192bdc904f955b] Merge tag 'sched_ext-for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext testing commit a23cd25baed2316e50597f8b67192bdc904f955b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 46bd5b21a16557c998f7e3045292e4aa10ca4abff3d27db3bdc181f0e8abdbea all runs: OK false negative chance: 0.000 # git bisect good a23cd25baed2316e50597f8b67192bdc904f955b Bisecting: 24 revisions left to test after this (roughly 5 steps) [bba0ccf829b904e6d1f119d94f01d7209d34ba28] cpuset: remove unused assignment to trialcs->partition_root_state testing commit bba0ccf829b904e6d1f119d94f01d7209d34ba28 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 77c404570f068dd97421e8fa4b0643a0701f43d193111cfed5b11e0e3271762a run #0: crashed: WARNING in cgroup_freeze run #1: crashed: WARNING in cgroup_freeze run #2: crashed: WARNING in cgroup_freeze run #3: crashed: WARNING in cgroup_freeze run #4: crashed: WARNING in cgroup_freeze run #5: crashed: WARNING in cgroup_freeze run #6: crashed: WARNING in cgroup_freeze run #7: crashed: WARNING in cgroup_freeze run #8: crashed: WARNING in cgroup_freeze run #9: boot failed: can't ssh into the instance representative crash: WARNING in cgroup_freeze, types: [WARNING] # git bisect bad bba0ccf829b904e6d1f119d94f01d7209d34ba28 Bisecting: 11 revisions left to test after this (roughly 4 steps) [3514309e03222c0ad06cd3fda0f0d2c98e786bf8] cpuset: Defer flushing of the cpuset_migrate_mm_wq to task_work testing commit 3514309e03222c0ad06cd3fda0f0d2c98e786bf8 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 460b3d10df69fb73914c928829c22bcbcfd51dfdcdc1edfb319c37920c5b8a01 all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] # git bisect bad 3514309e03222c0ad06cd3fda0f0d2c98e786bf8 Bisecting: 5 revisions left to test after this (roughly 3 steps) [5806b3d05165568eee665399d3c04349c151a0b9] cpuset: decouple tmpmasks and cpumasks freeing in cgroup testing commit 5806b3d05165568eee665399d3c04349c151a0b9 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: fd7dd2150de552b87d780d8ee48e1af139233d37b4f5bede63a13ed94c969a9b all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] # git bisect bad 5806b3d05165568eee665399d3c04349c151a0b9 Bisecting: 2 revisions left to test after this (roughly 2 steps) [afa3701c0e45ecb9e4d160048ca4e353c7489948] cgroup: cgroup.stat.local time accounting testing commit afa3701c0e45ecb9e4d160048ca4e353c7489948 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 42e25c5139e19713a094c430e2fdeb91801818ca9051234e10f3cde5912ee752 all runs: crashed: WARNING in cgroup_freeze representative crash: WARNING in cgroup_freeze, types: [WARNING] # git bisect bad afa3701c0e45ecb9e4d160048ca4e353c7489948 Bisecting: 0 revisions left to test after this (roughly 1 step) [4c70fb2624ab1588faa58dcd407d4c61d64b288d] cpuset: remove redundant CS_ONLINE flag testing commit 4c70fb2624ab1588faa58dcd407d4c61d64b288d gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 51f92b62cb4356112530b37b7e7d70b71f75f42790af30899f773e6117dca58c all runs: OK false negative chance: 0.000 # git bisect good 4c70fb2624ab1588faa58dcd407d4c61d64b288d afa3701c0e45ecb9e4d160048ca4e353c7489948 is the first bad commit commit afa3701c0e45ecb9e4d160048ca4e353c7489948 Author: Tiffany Yang Date: Thu Aug 21 18:37:52 2025 -0700 cgroup: cgroup.stat.local time accounting There isn't yet a clear way to identify a set of "lost" time that everyone (or at least a wider group of users) cares about. However, users can perform some delay accounting by iterating over components of interest. This patch allows cgroup v2 freezing time to be one of those components. Track the cumulative time that each v2 cgroup spends freezing and expose it to userland via a new local stat file in cgroupfs. Thank you to Michal, who provided the ASCII art in the updated documentation. To access this value: $ mkdir /sys/fs/cgroup/test $ cat /sys/fs/cgroup/test/cgroup.stat.local freeze_time_total 0 Ensure consistent freeze time reads with freeze_seq, a per-cgroup sequence counter. Writes are serialized using the css_set_lock. Signed-off-by: Tiffany Yang Cc: Tejun Heo Cc: Michal Koutný Signed-off-by: Tejun Heo Documentation/admin-guide/cgroup-v2.rst | 18 ++++++++++++++++++ include/linux/cgroup-defs.h | 17 +++++++++++++++++ kernel/cgroup/cgroup.c | 28 ++++++++++++++++++++++++++++ kernel/cgroup/freezer.c | 16 ++++++++++++---- 4 files changed, 75 insertions(+), 4 deletions(-) accumulated error probability: 0.00 culprit signature: 42e25c5139e19713a094c430e2fdeb91801818ca9051234e10f3cde5912ee752 parent signature: 51f92b62cb4356112530b37b7e7d70b71f75f42790af30899f773e6117dca58c revisions tested: 18, total time: 10h14m27.520917629s (build: 7h4m52.307227587s, test: 2h39m9.113697135s) first bad commit: afa3701c0e45ecb9e4d160048ca4e353c7489948 cgroup: cgroup.stat.local time accounting recipients (to): ["corbet@lwn.net" "linux-doc@vger.kernel.org" "tj@kernel.org" "ynaffit@google.com"] recipients (cc): ["cgroups@vger.kernel.org" "hannes@cmpxchg.org" "linux-kernel@vger.kernel.org" "mkoutny@suse.com" "tj@kernel.org"] crash: WARNING in cgroup_freeze ------------[ cut here ]------------ WARNING: CPU: 0 PID: 3721 at ./include/linux/seqlock.h:221 __seqprop_assert include/linux/seqlock.h:221 [inline] WARNING: CPU: 0 PID: 3721 at ./include/linux/seqlock.h:221 cgroup_do_freeze kernel/cgroup/freezer.c:182 [inline] WARNING: CPU: 0 PID: 3721 at ./include/linux/seqlock.h:221 cgroup_freeze+0x7fc/0xcc0 kernel/cgroup/freezer.c:309 Modules linked in: CPU: 0 UID: 0 PID: 3721 Comm: syz.3.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:__seqprop_assert include/linux/seqlock.h:221 [inline] RIP: 0010:cgroup_do_freeze kernel/cgroup/freezer.c:182 [inline] RIP: 0010:cgroup_freeze+0x7fc/0xcc0 kernel/cgroup/freezer.c:309 Code: 48 8b 7c 24 48 4c 89 e6 e8 91 2f fe ff 48 89 c3 b1 01 48 85 c0 0f 85 7d f9 ff ff e9 57 03 00 00 90 0f 0b 90 e9 9e fb ff ff 90 <0f> 0b 90 e9 e9 fb ff ff 48 c7 c1 40 ab cb 87 80 e1 07 80 c1 03 38 RSP: 0018:ffffc9000154f8e0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: ffff8880282f0000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff85d5aa60 RDI: 00000000ffffffff RBP: ffffc9000154fa90 R08: 0000000000000000 R09: ffffffff85937b9b R10: dffffc0000000000 R11: fffffbfff0f97397 R12: ffff8880282f0000 R13: 1ffff1100505e0ea R14: ffff8880282f0750 R15: dffffc0000000000 FS: 00007f1a5d06f6c0(0000) GS:ffff888130a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33d63fff CR3: 0000000037c50000 CR4: 00000000003506f0 Call Trace: cgroup_freeze_write+0xd6/0x140 kernel/cgroup/cgroup.c:4072 cgroup_file_write+0x2e3/0x5f0 kernel/cgroup/cgroup.c:4209 kernfs_fop_write_iter+0x29c/0x3f0 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7c6/0xae0 fs/read_write.c:686 ksys_write+0x10e/0x1f0 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1a5d1feec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1a5d06f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1a5d455fa0 RCX: 00007f1a5d1feec9 RDX: 0000000000000012 RSI: 0000200000000200 RDI: 0000000000000004 RBP: 00007f1a5d281f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1a5d456038 R14: 00007f1a5d455fa0 R15: 00007ffe2511c118