ci starts bisection 2024-04-26 01:12:53.537627945 +0000 UTC m=+119446.207118150 bisecting cause commit starting from e88c4cfcb7b888ac374916806f86c17d8ecaeb67 building syzkaller on 8bdc0f220628c9347b3581fead4c026272439799 ensuring issue is reproducible on original commit e88c4cfcb7b888ac374916806f86c17d8ecaeb67 testing commit e88c4cfcb7b888ac374916806f86c17d8ecaeb67 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 16666c16b34b8557768ad91a2563638c2ff272fa719c122ad87b6c85df4d4fd1 run #0: crashed: INFO: rcu detected stall in snd_timer_user_release run #1: crashed: INFO: rcu detected stall in snd_timer_user_release run #2: crashed: INFO: rcu detected stall in snd_timer_user_release run #3: crashed: INFO: rcu detected stall in snd_timer_user_release run #4: crashed: INFO: rcu detected stall in snd_timer_user_release run #5: crashed: INFO: rcu detected stall in snd_timer_user_release run #6: crashed: INFO: rcu detected stall in snd_timer_user_release run #7: crashed: INFO: rcu detected stall in snd_timer_user_release run #8: crashed: INFO: rcu detected stall in snd_timer_user_release run #9: crashed: INFO: rcu detected stall in snd_timer_user_release run #10: crashed: INFO: rcu detected stall in snd_timer_user_release run #11: crashed: INFO: rcu detected stall in snd_timer_user_release run #12: crashed: INFO: rcu detected stall in snd_timer_user_release run #13: crashed: INFO: rcu detected stall in corrupted run #14: crashed: INFO: rcu detected stall in snd_timer_user_release run #15: crashed: INFO: rcu detected stall in snd_timer_user_release run #16: crashed: INFO: rcu detected stall in snd_timer_user_release run #17: crashed: INFO: rcu detected stall in snd_timer_user_release run #18: crashed: INFO: rcu detected stall in snd_timer_user_release run #19: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] check whether we can drop unnecessary instrumentation disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed testing commit e88c4cfcb7b888ac374916806f86c17d8ecaeb67 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f68a83c06ec421a1a83909ba7d4f67c83fb0f0ede8e4a25dc2812cd3fcca8fb3 all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] the bug reproduces without the instrumentation disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed kconfig minimization: base=3976 full=8005 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 [BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK UBSAN], they are not needed testing commit e88c4cfcb7b888ac374916806f86c17d8ecaeb67 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 955a84a2ce9a8ce76d069b7a0d53883b1b092a70aad548517f902d8850106dc7 all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed testing commit e88c4cfcb7b888ac374916806f86c17d8ecaeb67 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 541a59dec22c5d4fdc2c52405b62192b82b51137bc6dd1049ff04d8a5ad506a8 run #0: crashed: INFO: rcu detected stall in snd_timer_user_release run #1: crashed: INFO: rcu detected stall in snd_timer_user_release run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in snd_timer_user_release run #4: crashed: INFO: rcu detected stall in snd_timer_user_release run #5: crashed: INFO: rcu detected stall in snd_timer_user_release run #6: crashed: INFO: rcu detected stall in snd_timer_user_release run #7: crashed: INFO: rcu detected stall in snd_timer_user_release run #8: crashed: INFO: rcu detected stall in snd_timer_user_release run #9: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit e88c4cfcb7b888ac374916806f86c17d8ecaeb67 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 1d15ea82bafb14a5e9c78403d859b0b8e967b15f7c2b7f297d47775b14a82793 all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit e88c4cfcb7b888ac374916806f86c17d8ecaeb67 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8aee9e6771eae1420cb712bef2206242939bc0ce80aff9c236e8934a67a96882 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed testing commit e88c4cfcb7b888ac374916806f86c17d8ecaeb67 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a56e32b132ea07b0548c7c19be90878cc03fab727e30461d979d625864085ff7 run #0: crashed: INFO: rcu detected stall in snd_timer_user_release run #1: crashed: INFO: rcu detected stall in snd_timer_user_release run #2: crashed: INFO: rcu detected stall in snd_timer_user_release run #3: crashed: INFO: rcu detected stall in snd_timer_user_release run #4: crashed: INFO: rcu detected stall in snd_timer_user_release run #5: crashed: INFO: rcu detected stall in sys_readlink run #6: crashed: INFO: rcu detected stall in snd_timer_user_release run #7: crashed: INFO: rcu detected stall in snd_timer_user_release run #8: crashed: INFO: rcu detected stall in snd_timer_user_release run #9: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] 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_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 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 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 LOCKDEP ATOMIC_SLEEP 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: 61b853fec001b435088bb361dcd1c7a3449be96595f3f0bcb1c120a12d7447a4 all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] 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: 5af4873717eb17a8c78c26a940c2ede26b1f18d1b52804d4668c53d7dd4b6c45 all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] 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: aff4a08b61205a847e2199dc9ff8338fc14984c75ab35816c4b202945cf55a5c all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] 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: e926c89a44ad99c46c8cdf22a4092a334ab2fce986b0400b743dde1be3a499eb all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] testing release v6.2 testing commit c9c3395d5e3dcc6daee66c6908354d47bf98cb0c gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: da82543eed6fbf8ee47f5f6b23382180ff5fc44b46bd6b147db4e5f95673d61e all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] testing release v6.0 testing commit 4fe89d07dcc2804c8b562f6c7896a45643d34b2f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 49a6a193f215289fb4f71a246094d493b64f1d60a6e3dd344c5b6868e1a850a3 all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] testing release v5.18 testing commit 4b0986a3613c92f4ec1bdc7f60ec66fea135991f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 09944155d5fe6e25adf524e20678184157e17fb83ab4d3c363a9f48ad4b3a6dd all runs: crashed: INFO: rcu detected stall in snd_timer_user_release representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG] testing release v5.16 testing commit df0cc57e057f18e44dac8e6c18aba47ab53202f9 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4904a573f38d98f0d83c7bc3e8bd63f360cb0d823caa3bd7f0e32fbc0fe9dade run #0: crashed: INFO: rcu detected stall in snd_timer_user_release run #1: crashed: BUG: soft lockup in smp_call_function run #2: crashed: BUG: soft lockup in smp_call_function run #3: crashed: BUG: soft lockup in smp_call_function run #4: crashed: BUG: soft lockup in smp_call_function run #5: crashed: BUG: soft lockup in smp_call_function run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG UNKNOWN] testing release v5.13 testing commit 62fb9874f5da54fdb243003b386128037319b219 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 83c352e1bf378f59813e6f2b15850567c40f58142bada12344bb50e47c1d864c run #0: crashed: INFO: rcu detected stall in smp_call_function run #1: crashed: INFO: rcu detected stall in smp_call_function run #2: crashed: BUG: soft lockup in smp_call_function run #3: crashed: INFO: rcu detected stall in smp_call_function run #4: crashed: BUG: soft lockup in smp_call_function run #5: crashed: BUG: soft lockup in smp_call_function run #6: crashed: BUG: soft lockup in smp_call_function run #7: crashed: BUG: soft lockup in smp_call_function run #8: crashed: BUG: soft lockup in smp_call_function run #9: crashed: no output from test machine representative crash: INFO: rcu detected stall in smp_call_function, types: [HANG] testing release v5.10 testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 13be33223b3c02dbbfc7aa58aa3576f09bc5d2507af8de43e7081dfbe8399ac9 run #0: basic kernel testing failed: failed to copy binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor1148150189" "root@10.128.0.63:./syz-executor1148150189"]: exit status 255 Executing: program /usr/bin/ssh host 10.128.0.63, user root, command sftp OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 debug1: Reading configuration data /dev/null debug1: Connecting to 10.128.0.63 [10.128.0.63] port 22. debug1: connect to address 10.128.0.63 port 22: Connection timed out ssh: connect to host 10.128.0.63 port 22: Connection timed out scp: Connection closed run #1: crashed: INFO: rcu detected stall in do_idle run #2: crashed: INFO: rcu detected stall in do_idle run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in do_idle run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine representative crash: no output from test machine, types: [UNKNOWN] testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 gcc compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 00cd711fb779d95ee8338ec6c8ee4aece7f70354e2d7780f4634970d5ba7cf4e run #0: crashed: INFO: rcu detected stall in snd_timer_user_release run #1: crashed: INFO: rcu detected stall in snd_timer_user_release run #2: crashed: INFO: rcu detected stall in snd_timer_user_release run #3: crashed: INFO: rcu detected stall in snd_timer_user_release run #4: crashed: INFO: rcu detected stall in snd_timer_user_release run #5: crashed: INFO: rcu detected stall in snd_timer_user_release run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: basic kernel testing failed: failed to copy binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor3232173907" "root@10.128.0.185:./syz-executor3232173907"]: exit status 255 Executing: program /usr/bin/ssh host 10.128.0.185, user root, command sftp OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 debug1: Reading configuration data /dev/null debug1: Connecting to 10.128.0.185 [10.128.0.185] port 22. debug1: connect to address 10.128.0.185 port 22: Connection timed out ssh: connect to host 10.128.0.185 port 22: Connection timed out scp: Connection closed representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG UNKNOWN] testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 gcc compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: ec4c014c7aad0823a01a94a28fc328314b2e8f7c470459efa8cd84915e63297b run #0: crashed: INFO: rcu detected stall in snd_timer_user_release run #1: crashed: INFO: rcu detected stall in snd_timer_user_release run #2: crashed: INFO: rcu detected stall in snd_timer_user_release run #3: crashed: INFO: rcu detected stall in snd_timer_user_release run #4: crashed: INFO: rcu detected stall in snd_timer_user_release run #5: crashed: INFO: rcu detected stall in snd_timer_user_release run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: basic kernel testing failed: failed to copy binary to VM: timedout after 1m0s ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor2383463785" "root@10.128.10.11:./syz-executor2383463785"] Executing: program /usr/bin/ssh host 10.128.10.11, user root, command sftp OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 debug1: Reading configuration data /dev/null debug1: Connecting to 10.128.10.11 [10.128.10.11] port 22. debug1: fd 3 clearing O_NONBLOCK debug1: Connection established. debug1: identity file /root/.ssh/id_rsa type -1 debug1: identity file /root/.ssh/id_rsa-cert type -1 debug1: identity file /root/.ssh/id_ecdsa type -1 debug1: identity file /root/.ssh/id_ecdsa-cert type -1 debug1: identity file /root/.ssh/id_ecdsa_sk type -1 debug1: identity file /root/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /root/.ssh/id_ed25519 type -1 debug1: identity file /root/.ssh/id_ed25519-cert type -1 debug1: identity file /root/.ssh/id_ed25519_sk type -1 debug1: identity file /root/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /root/.ssh/id_xmss type -1 debug1: identity file /root/.ssh/id_xmss-cert type -1 debug1: identity file /root/.ssh/id_dsa type -1 debug1: identity file /root/.ssh/id_dsa-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u2 debug1: Remote protocol version 2.0, remote software version OpenSSH_9.1 debug1: compat_banner: match: OpenSSH_9.1 pat OpenSSH* compat 0x04000000 debug1: Authenticating to 10.128.10.11:22 as 'root' debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory debug1: SSH2_MSG_KEXINIT sent representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG UNKNOWN] testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd gcc compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 3ae348b35052fbc9356b5bb6d636a5c5ee7e9d674b13b2915dc00ffcc9b6e392 run #0: crashed: INFO: rcu detected stall in snd_timer_user_release run #1: crashed: INFO: rcu detected stall in snd_timer_user_release run #2: crashed: INFO: rcu detected stall in snd_timer_user_release run #3: crashed: INFO: rcu detected stall in snd_timer_user_release run #4: crashed: INFO: rcu detected stall in snd_timer_user_release run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: basic kernel testing failed: failed to copy binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor3043184910" "root@10.128.10.36:./syz-executor3043184910"]: exit status 255 Executing: program /usr/bin/ssh host 10.128.10.36, user root, command sftp OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 debug1: Reading configuration data /dev/null debug1: Connecting to 10.128.10.36 [10.128.10.36] port 22. debug1: connect to address 10.128.10.36 port 22: Connection timed out ssh: connect to host 10.128.10.36 port 22: Connection timed out scp: Connection closed run #9: basic kernel testing failed: failed to copy binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor2942384654" "root@10.128.10.42:./syz-executor2942384654"]: exit status 255 Executing: program /usr/bin/ssh host 10.128.10.42, user root, command sftp OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 debug1: Reading configuration data /dev/null debug1: Connecting to 10.128.10.42 [10.128.10.42] port 22. debug1: connect to address 10.128.10.42 port 22: Connection timed out ssh: connect to host 10.128.10.42 port 22: Connection timed out scp: Connection closed representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG UNKNOWN] testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d gcc compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: b94f3765a6e179ae44572ae999098701640651d1c58d7d0387f9cbe9a273287c run #0: crashed: INFO: rcu detected stall in snd_timer_user_release run #1: crashed: INFO: rcu detected stall in snd_timer_user_release run #2: crashed: INFO: rcu detected stall in snd_timer_user_release run #3: crashed: INFO: rcu detected stall in snd_timer_user_release run #4: crashed: no output from test machine run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: basic kernel testing failed: failed to copy binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor865087938" "root@10.128.1.56:./syz-executor865087938"]: exit status 255 Executing: program /usr/bin/ssh host 10.128.1.56, user root, command sftp OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 debug1: Reading configuration data /dev/null debug1: Connecting to 10.128.1.56 [10.128.1.56] port 22. debug1: connect to address 10.128.1.56 port 22: Connection timed out ssh: connect to host 10.128.1.56 port 22: Connection timed out scp: Connection closed run #8: basic kernel testing failed: failed to copy binary to VM: timedout after 1m0s ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor4101167737" "root@10.128.1.134:./syz-executor4101167737"] Executing: program /usr/bin/ssh host 10.128.1.134, user root, command sftp OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 debug1: Reading configuration data /dev/null debug1: Connecting to 10.128.1.134 [10.128.1.134] port 22. debug1: fd 3 clearing O_NONBLOCK debug1: Connection established. debug1: identity file /root/.ssh/id_rsa type -1 debug1: identity file /root/.ssh/id_rsa-cert type -1 debug1: identity file /root/.ssh/id_ecdsa type -1 debug1: identity file /root/.ssh/id_ecdsa-cert type -1 debug1: identity file /root/.ssh/id_ecdsa_sk type -1 debug1: identity file /root/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /root/.ssh/id_ed25519 type -1 debug1: identity file /root/.ssh/id_ed25519-cert type -1 debug1: identity file /root/.ssh/id_ed25519_sk type -1 debug1: identity file /root/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /root/.ssh/id_xmss type -1 debug1: identity file /root/.ssh/id_xmss-cert type -1 debug1: identity file /root/.ssh/id_dsa type -1 debug1: identity file /root/.ssh/id_dsa-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u2 debug1: Remote protocol version 2.0, remote software version OpenSSH_9.1 debug1: compat_banner: match: OpenSSH_9.1 pat OpenSSH* compat 0x04000000 debug1: Authenticating to 10.128.1.134:22 as 'root' debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory debug1: SSH2_MSG_KEXINIT sent run #9: basic kernel testing failed: failed to copy binary to VM: timedout after 1m0s ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "/tmp/syz-executor2571199539" "root@10.128.0.64:./syz-executor2571199539"] Executing: program /usr/bin/ssh host 10.128.0.64, user root, command sftp OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023 debug1: Reading configuration data /dev/null debug1: Connecting to 10.128.0.64 [10.128.0.64] port 22. debug1: fd 3 clearing O_NONBLOCK debug1: Connection established. debug1: identity file /root/.ssh/id_rsa type -1 debug1: identity file /root/.ssh/id_rsa-cert type -1 debug1: identity file /root/.ssh/id_ecdsa type -1 debug1: identity file /root/.ssh/id_ecdsa-cert type -1 debug1: identity file /root/.ssh/id_ecdsa_sk type -1 debug1: identity file /root/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /root/.ssh/id_ed25519 type -1 debug1: identity file /root/.ssh/id_ed25519-cert type -1 debug1: identity file /root/.ssh/id_ed25519_sk type -1 debug1: identity file /root/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /root/.ssh/id_xmss type -1 debug1: identity file /root/.ssh/id_xmss-cert type -1 debug1: identity file /root/.ssh/id_dsa type -1 debug1: identity file /root/.ssh/id_dsa-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u2 debug1: Remote protocol version 2.0, remote software version OpenSSH_9.1 debug1: compat_banner: match: OpenSSH_9.1 pat OpenSSH* compat 0x04000000 debug1: Authenticating to 10.128.0.64:22 as 'root' debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory debug1: SSH2_MSG_KEXINIT sent representative crash: INFO: rcu detected stall in snd_timer_user_release, types: [HANG UNKNOWN] crash still not fixed/happens on the oldest tested release revisions tested: 21, total time: 9h19m25.891476121s (build: 6h1m20.987734191s, test: 3h0m43.217445316s) oldest tested release already had the bug or it had kernel test errors commit msg: Linux 4.19 crash: INFO: rcu detected stall in snd_timer_user_release Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 ticks this GP) idle=e96/1/0x4000000000000002 softirq=6316/6316 fqs=0 rcu: (detected by 1, t=10002 jiffies, g=1253, q=1261) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4288 Comm: syz-executor.2 Not tainted 4.19.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:__lock_acquire.isra.10+0x0/0x680 kernel/locking/lockdep.c:3266 Code: 7f 03 5b 5d c3 e8 a0 3f 54 00 85 c0 74 f4 8b 05 86 78 8c 02 85 c0 0f 84 21 17 00 00 eb e4 66 66 2e 0f 1f 84 00 00 00 00 00 90 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 08 44 8b 25 f8 ef RSP: 0018:ffff88013ba03df8 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffffffff839fb7a8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff839fb7c0 RBP: ffff88013ba03e58 R08: 0000000000000001 R09: 0000000000000000 R10: ffff880132f25e00 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f8ab3c7e480(0000) GS:ffff88013ba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6ff3c80818 CR3: 0000000133b22000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x54/0x70 kernel/locking/spinlock.c:152 debug_object_activate lib/debugobjects.c:473 [inline] debug_object_activate+0x4e/0x1c0 lib/debugobjects.c:457 debug_hrtimer_activate kernel/time/hrtimer.c:416 [inline] debug_activate kernel/time/hrtimer.c:465 [inline] enqueue_hrtimer+0x20/0xf0 kernel/time/hrtimer.c:954 __run_hrtimer kernel/time/hrtimer.c:1413 [inline] __hrtimer_run_queues+0x313/0x390 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0xfc/0x210 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline] smp_apic_timer_interrupt+0x80/0x1e0 arch/x86/kernel/apic/apic.c:1054 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:788 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x36/0x70 kernel/locking/spinlock.c:184 Code: 18 53 48 8b 55 08 48 89 f3 be 01 00 00 00 e8 01 94 13 ff 4c 89 e7 e8 b9 ca 13 ff 48 83 3d f9 3d cc 00 00 74 2b 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 0b 26 11 ff 65 8b 05 04 6c 09 7e RSP: 0018:ffffc90001c27d88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000000282 RCX: ffffc90001c27d44 RDX: 0000000000000003 RSI: 0000000000000003 RDI: 0000000000000282 RBP: ffffc90001c27d98 R08: 000000000000002e R09: 0000000000000000 R10: 0000000000000000 R11: 000000000000002e R12: ffff880136f79730 R13: 0000000000000001 R14: ffff880136f79730 R15: 0000000000000282 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] snd_timer_stop1+0x4f/0x1f0 sound/core/timer.c:607 snd_timer_stop+0x1b/0x20 sound/core/timer.c:658 snd_timer_close_locked+0x5a/0x2c0 sound/core/timer.c:362 snd_timer_close+0x28/0x40 sound/core/timer.c:424 snd_timer_user_release+0x3c/0x70 sound/core/timer.c:1456 __fput+0xa9/0x1e0 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x8f/0xb0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0xd8/0xf0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x15f/0x170 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f8ab1aecd9a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24 RSP: 002b:00007ffd79aefe50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f8ab1aecd9a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f8ab1c1d980 R08: 00007f8ab1a70000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000293 R12: 000000000000b4c2 R13: 000000000000b490 R14: 00007ffd79af0010 R15: 00007f8ab1aa4cb0 rcu: rcu_preempt kthread starved for 10002 jiffies! g1253 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I14504 10 2 0x80080000 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x2f4/0x8d0 kernel/sched/core.c:3473 schedule+0x31/0x90 kernel/sched/core.c:3517 schedule_timeout+0x206/0x4f0 kernel/time/timer.c:1804 rcu_gp_kthread+0x53e/0x960 kernel/rcu/tree.c:2194 kthread+0x11c/0x140 kernel/kthread.c:246 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:413