ci2 starts bisection 2026-09-23 00:31:17.285835968 +0000 UTC m=+17653.160709867
bisecting fixing commit since e4f7d8be268ecf717f94ee2e242afa79ddeacaed
building syzkaller on 1e72964b0111319984575e60f266d1fa0a98abb5
ensuring issue is reproducible on original commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed
testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 25118611121e9f21767beab0129ffab8573a85c98571209dc7ff5b0b4e758d94
run #0: crashed: WARNING in update_rq_clock
run #1: crashed: possible deadlock in console_emit_next_record
run #2: crashed: possible deadlock in console_emit_next_record
run #3: crashed: possible deadlock in console_emit_next_record
run #4: crashed: WARNING in update_rq_clock
run #5: crashed: possible deadlock in console_emit_next_record
run #6: crashed: possible deadlock in console_emit_next_record
run #7: crashed: WARNING in update_rq_clock
run #8: crashed: WARNING in update_rq_clock
run #9: crashed: possible deadlock in console_emit_next_record
run #10: crashed: WARNING in update_rq_clock
run #11: crashed: WARNING in update_rq_clock
run #12: crashed: WARNING in update_rq_clock
run #13: crashed: WARNING in update_rq_clock
run #14: crashed: possible deadlock in console_emit_next_record
run #15: crashed: possible deadlock in console_emit_next_record
run #16: crashed: WARNING in update_rq_clock
run #17: crashed: WARNING in update_rq_clock
run #18: crashed: possible deadlock in console_emit_next_record
run #19: crashed: possible deadlock in console_emit_next_record
representative crash: WARNING in update_rq_clock, types: [WARNING LOCKDEP]
check whether we can drop unnecessary instrumentation
disabling configs for [atomic_sleep hang memleak ubsan kasan], they are not needed
testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 85dfb2a6204889c3cd3ef91ebce0ea26b2c842f8140f98ae509e25fc37d5fd7c
run #0: crashed: possible deadlock in console_emit_next_record
run #1: crashed: WARNING in update_rq_clock
run #2: crashed: possible deadlock in console_emit_next_record
run #3: crashed: possible deadlock in console_emit_next_record
run #4: crashed: possible deadlock in console_emit_next_record
run #5: crashed: WARNING in update_rq_clock
run #6: crashed: WARNING in update_rq_clock
run #7: crashed: possible deadlock in console_emit_next_record
run #8: crashed: WARNING in update_rq_clock
run #9: crashed: WARNING in update_rq_clock
representative crash: possible deadlock in console_emit_next_record, types: [LOCKDEP WARNING]
the bug reproduces without the instrumentation
disabling configs for [atomic_sleep hang memleak ubsan kasan], they are not needed
kconfig minimization: base=3829 full=7621 leaves diff=2129
split chunks (needed=false): <2129>
split chunk #0 of len 2129 into 5 parts
testing without sub-chunk 1/5
disabling configs for [atomic_sleep hang memleak ubsan kasan], they are not needed
testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 16ace09a57ca2590494a8c3a4c779e0393c02a450afc9a224b68d8ad7a22fb2a
run #0: crashed: WARNING in update_rq_clock
run #1: crashed: possible deadlock in console_emit_next_record
run #2: crashed: WARNING in update_rq_clock
run #3: crashed: WARNING in update_rq_clock
run #4: crashed: WARNING in update_rq_clock
run #5: crashed: WARNING in update_rq_clock
run #6: crashed: possible deadlock in console_emit_next_record
run #7: crashed: WARNING in update_rq_clock
run #8: crashed: possible deadlock in console_emit_next_record
run #9: crashed: possible deadlock in console_emit_next_record
representative crash: WARNING in update_rq_clock, types: [WARNING LOCKDEP]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [kasan atomic_sleep hang memleak ubsan], they are not needed
testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 609c42df9c2e0e2cca394898b00608fc00bbe2a78e7e37c3aa9bf06fb0672e08
run #0: crashed: WARNING in update_rq_clock
run #1: crashed: possible deadlock in console_emit_next_record
run #2: crashed: WARNING in update_rq_clock
run #3: crashed: possible deadlock in console_emit_next_record
run #4: crashed: possible deadlock in console_emit_next_record
run #5: crashed: WARNING in update_rq_clock
run #6: crashed: WARNING in update_rq_clock
run #7: crashed: WARNING in update_rq_clock
run #8: crashed: possible deadlock in console_emit_next_record
run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in __schedule
representative crash: WARNING in update_rq_clock, types: [WARNING LOCKDEP]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [memleak ubsan kasan atomic_sleep hang], they are not needed
testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 04deb20a44ee5b0ddaf86b50a48edea0f9759ee0e21e45d7b3234c3a313dc81b
run #0: crashed: WARNING in update_rq_clock
run #1: crashed: WARNING in update_rq_clock
run #2: crashed: possible deadlock in console_emit_next_record
run #3: crashed: possible deadlock in console_emit_next_record
run #4: crashed: possible deadlock in console_emit_next_record
run #5: crashed: possible deadlock in console_emit_next_record
run #6: crashed: possible deadlock in console_emit_next_record
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in __schedule
run #8: crashed: possible deadlock in console_emit_next_record
run #9: crashed: possible deadlock in console_emit_next_record
representative crash: possible deadlock in console_emit_next_record, types: [LOCKDEP WARNING]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [memleak ubsan kasan atomic_sleep hang], they are not needed
testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 5b8fffbbcfbc6b2b93d488da184429c9130aaf615902636caf1849e9161b238b
all runs: OK
false negative chance: 0.000
testing without sub-chunk 5/5
disabling configs for [kasan atomic_sleep hang memleak ubsan], they are not needed
testing commit e4f7d8be268ecf717f94ee2e242afa79ddeacaed gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 98adf928616ddb1b75f744c67c35f1a518ccd4ef7f002b3c1b341c411e7dd7c2
all runs: crashed: possible deadlock in console_emit_next_record
representative crash: possible deadlock in console_emit_next_record, types: [LOCKDEP]
the chunk can be dropped
minimized to 426 configs; suspects: [AF_RXRPC ARCH_ENABLE_MEMORY_HOTREMOVE ATM AX25 BXT_WC_PMIC_OPREGION CFG80211 CMA DAX DLM DRM DVB_CORE ENCRYPTED_KEYS EXTCON GENEVE GPIOLIB HAMRADIO HAVE_CLK HID_NINTENDO HID_PLAYSTATION HID_SENSOR_HUB HID_SMARTJOYPLUS 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_SDR_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_ADVANCED NETFILTER_CONNCOUNT NET_IPGRE NET_IPGRE_DEMUX NFS_V4_1 NF_CONNTRACK_SNMP NF_DUP_NETDEV NF_FLOW_TABLE NF_FLOW_TABLE_INET NF_NAT_AMANDA NF_NAT_H323 NF_NAT_PPTP NF_NAT_REDIRECT NF_NAT_SNMP_BASIC NF_NAT_TFTP NF_SOCKET_IPV4 NF_SOCKET_IPV6 NF_TABLES NF_TABLES_ARP NF_TABLES_NETDEV NF_TPROXY_IPV4 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 NOZOMI NTFS3_FS NTFS3_FS_POSIX_ACL NTFS3_LZX_XPRESS NTFS_FS NTFS_RW 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_INDEX OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW OVERLAY_FS_REDIRECT_DIR PACKET_DIAG PADATA 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 PLAYSTATION_FF PLFXLC PMIC_OPREGION PM_CLK PNFS_BLOCK PNFS_FILE_LAYOUT PNFS_FLEXFILE_LAYOUT PPP PPPOATM PPPOE PPPOL2TP PPP_ASYNC PPP_BSDCOMP PPP_DEFLATE PPP_FILTER PPP_MPPE PPP_MULTILINK PPP_SYNC_TTY PPTP PREEMPT PREEMPT_NOTIFIERS PRISM2_USB PROC_CHILDREN PROC_MEM_ALWAYS_FORCE PSI PSTORE PSTORE_842_COMPRESS PSTORE_COMPRESS PSTORE_DEFLATE_COMPRESS PSTORE_DEFLATE_COMPRESS_DEFAULT PSTORE_LZ4HC_COMPRESS PSTORE_LZ4_COMPRESS PSTORE_LZO_COMPRESS PSTORE_ZSTD_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 READ_ONLY_THP_FOR_FS REALTEK_AUTOPM REED_SOLOMON REED_SOLOMON_DEC8 REGMAP REGMAP_I2C REGMAP_IRQ REGMAP_MMIO REGULATOR REGULATOR_FIXED_VOLTAGE 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 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 SENSORS_AQUACOMPUTER_D5NEXT SENSORS_CORSAIR_CPRO SENSORS_CORSAIR_PSU SENSORS_NZXT_KRAKEN2 SENSORS_NZXT_SMART2 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 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_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_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_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 SOUND_OSS_CORE SOUND_OSS_CORE_PRECLAIM SPI SPI_DLN2 SPI_DYNAMIC SPI_MASTER SQUASHFS SQUASHFS_4K_DEVBLK_SIZE 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 STAGING_MEDIA 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 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 TRANSPARENT_HUGEPAGE TRANSPARENT_HUGEPAGE_MADVISE 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_INTEL_PMC 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_AIRSPY USB_ALI_M5632 USB_AN2720 USB_APPLEDISPLAY USB_ARMLINUX USB_BDC_UDC USB_BELKIN USB_C67X00_HCD USB_CATC USB_CDC_PHONET 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 WLAN_VENDOR_PURELIFI ZONE_DEVICE]
disabling configs for [kasan atomic_sleep hang memleak ubsan], they are not needed
testing current HEAD 1a8763b93150b2c8f3992c27a5ce7857fee4ab0f
testing commit 1a8763b93150b2c8f3992c27a5ce7857fee4ab0f gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 6ee4238950abf03b2de534c13932c117607e83218fe0aa393ab9f2f13609c022
run #0: crashed: possible deadlock in console_emit_next_record
run #1: crashed: possible deadlock in console_emit_next_record
run #2: crashed: possible deadlock in console_emit_next_record
run #3: crashed: WARNING in update_rq_clock
run #4: crashed: WARNING in update_rq_clock
run #5: crashed: possible deadlock in console_emit_next_record
run #6: crashed: possible deadlock in console_emit_next_record
run #7: crashed: WARNING in update_rq_clock
run #8: crashed: WARNING in update_rq_clock
run #9: crashed: possible deadlock in console_emit_next_record
representative crash: possible deadlock in console_emit_next_record, types: [LOCKDEP WARNING]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 1h57m12.676749224s (build: 50m15.905172021s, test: 57m14.110774582s)
crash still not fixed or there were kernel test errors
commit msg: Linux 6.1.188
crash: possible deadlock in console_emit_next_record
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
migration/0/16 is trying to acquire lock:
ffffffff8356fe60 (console_owner){....}-{0:0}, at: console_lock_spinning_enable kernel/printk/printk.c:1818 [inline]
ffffffff8356fe60 (console_owner){....}-{0:0}, at: console_emit_next_record+0x2ed/0x490 kernel/printk/printk.c:2774
but task is already holding lock:
ffff88813bc2c298 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x4d/0x80 kernel/sched/core.c:546
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&rq->__lock){-.-.}-{2:2}:
_raw_spin_lock_nested+0x2e/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x20/0x80 kernel/sched/core.c:538
raw_spin_rq_lock kernel/sched/sched.h:1362 [inline]
rq_lock kernel/sched/sched.h:1652 [inline]
task_fork_fair+0x2d/0x110 kernel/sched/fair.c:11923
sched_cgroup_fork+0xe1/0x100 kernel/sched/core.c:4687
copy_process+0xd8d/0x1410 kernel/fork.c:2467
kernel_clone+0xec/0x390 kernel/fork.c:2765
user_mode_thread+0xc3/0xf0 kernel/fork.c:2841
rest_init+0x1c/0x1e0 init/main.c:671
start_kernel+0x0/0x3c1 init/main.c:865
start_kernel+0x346/0x3c1 init/main.c:1112
secondary_startup_64_no_verify+0xcf/0xdb
-> #3 (&p->pi_lock){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x90 kernel/locking/spinlock.c:162
try_to_wake_up+0x4e/0x7d0 kernel/sched/core.c:4112
__wake_up_common+0xc8/0x150 kernel/sched/wait.c:107
__wake_up_common_lock kernel/sched/wait.c:138 [inline]
__wake_up+0x7a/0xc0 kernel/sched/wait.c:160
tty_port_default_wakeup+0x50/0x90 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x143/0x170 drivers/tty/serial/8250/8250_port.c:1854
serial8250_handle_irq+0x164/0x1a0 drivers/tty/serial/8250/8250_port.c:1961
serial8250_default_handle_irq+0x36/0x70 drivers/tty/serial/8250/8250_port.c:1981
serial8250_interrupt+0x49/0xf0 drivers/tty/serial/8250/8250_core.c:126
__handle_irq_event_percpu+0xca/0x2b0 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0x2c/0x60 kernel/irq/handle.c:210
handle_edge_irq+0xcd/0x1f0 kernel/irq/chip.c:819
generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
handle_irq arch/x86/kernel/irq.c:233 [inline]
__common_interrupt+0xa5/0x140 arch/x86/kernel/irq.c:252
common_interrupt+0x9c/0xc0 arch/x86/kernel/irq.c:242
asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:682
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
default_idle+0xb/0x10 arch/x86/kernel/process.c:741
default_idle_call+0x70/0x1a0 kernel/sched/idle.c:109
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x1eb/0x330 kernel/sched/idle.c:323
cpu_startup_entry+0x20/0x30 kernel/sched/idle.c:422
start_secondary+0x7d/0x80 arch/x86/kernel/smpboot.c:281
secondary_startup_64_no_verify+0xcf/0xdb
-> #2 (&tty->write_wait){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x90 kernel/locking/spinlock.c:162
__wake_up_common_lock kernel/sched/wait.c:137 [inline]
__wake_up+0x62/0xc0 kernel/sched/wait.c:160
tty_port_default_wakeup+0x50/0x90 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x143/0x170 drivers/tty/serial/8250/8250_port.c:1854
serial8250_handle_irq+0x164/0x1a0 drivers/tty/serial/8250/8250_port.c:1961
serial8250_default_handle_irq+0x36/0x70 drivers/tty/serial/8250/8250_port.c:1981
serial8250_interrupt+0x49/0xf0 drivers/tty/serial/8250/8250_core.c:126
__handle_irq_event_percpu+0xca/0x2b0 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0x2c/0x60 kernel/irq/handle.c:210
handle_edge_irq+0xcd/0x1f0 kernel/irq/chip.c:819
generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
handle_irq arch/x86/kernel/irq.c:233 [inline]
__common_interrupt+0xa5/0x140 arch/x86/kernel/irq.c:252
common_interrupt+0x9c/0xc0 arch/x86/kernel/irq.c:242
asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:682
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x61/0xb0 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
uart_write+0x185/0x260 drivers/tty/serial/serial_core.c:601
process_output_block drivers/tty/n_tty.c:586 [inline]
n_tty_write+0x317/0x490 drivers/tty/n_tty.c:2377
do_tty_write drivers/tty/tty_io.c:1018 [inline]
file_tty_write+0x1ea/0x300 drivers/tty/tty_io.c:1089
call_write_iter include/linux/fs.h:2271 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x23d/0x2e0 fs/read_write.c:584
ksys_write+0x70/0xf0 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #1 (&port_lock_key){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5c/0x90 kernel/locking/spinlock.c:162
serial8250_console_write+0x6e/0x620 drivers/tty/serial/8250/8250_port.c:3438
call_console_driver kernel/printk/printk.c:1977 [inline]
console_emit_next_record+0x360/0x490 kernel/printk/printk.c:2777
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0xf9/0x210 kernel/printk/printk.c:2906
vprintk_emit+0x297/0x3f0 kernel/printk/printk.c:2303
_printk+0x54/0x70 kernel/printk/printk.c:2328
register_console+0x26c/0x2e0 kernel/printk/printk.c:3269
univ8250_console_init+0x20/0x23 drivers/tty/serial/8250/8250_core.c:687
console_init+0x84/0x1fb kernel/printk/printk.c:3359
start_kernel+0x292/0x3c1 init/main.c:1048
secondary_startup_64_no_verify+0xcf/0xdb
-> #0 (console_owner){....}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3095 [inline]
check_prevs_add kernel/locking/lockdep.c:3214 [inline]
validate_chain kernel/locking/lockdep.c:3830 [inline]
__lock_acquire+0x150e/0x2820 kernel/locking/lockdep.c:5063
lock_acquire+0xf4/0x300 kernel/locking/lockdep.c:5678
console_lock_spinning_enable kernel/printk/printk.c:1818 [inline]
console_emit_next_record+0x30e/0x490 kernel/printk/printk.c:2774
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0xf9/0x210 kernel/printk/printk.c:2906
vprintk_emit+0x297/0x3f0 kernel/printk/printk.c:2303
_printk+0x54/0x70 kernel/printk/printk.c:2328
__report_bug lib/bug.c:195 [inline]
report_bug+0x118/0x160 lib/bug.c:219
handle_bug+0x3a/0x70 arch/x86/kernel/traps.c:324
exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:345
asm_exc_invalid_op+0x16/0x20 arch/x86/include/asm/idtentry.h:606
update_rq_clock+0x9e/0xc0 kernel/sched/core.c:750
pick_next_task kernel/sched/core.c:6052 [inline]
__schedule+0xc5d/0x1200 kernel/sched/core.c:6526
schedule+0x50/0x80 kernel/sched/core.c:6639
smpboot_thread_fn+0x162/0x200 kernel/smpboot.c:160
kthread+0xd7/0xf0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
other info that might help us debug this:
Chain exists of:
console_owner --> &p->pi_lock --> &rq->__lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&rq->__lock);
lock(&p->pi_lock);
lock(&rq->__lock);
lock(console_owner);
*** DEADLOCK ***
2 locks held by migration/0/16:
#0: ffff88813bc2c298 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x4d/0x80 kernel/sched/core.c:546
#1: ffffffff8356fee0 (console_lock){+.+.}-{0:0}, at: _printk+0x54/0x70 kernel/printk/printk.c:2328
stack backtrace:
CPU: 0 PID: 16 Comm: migration/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Stopper: 0x0 <- 0x0
Call Trace:
dump_stack_lvl+0x7f/0xdb lib/dump_stack.c:106
check_noncircular+0x11f/0x130 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3095 [inline]
check_prevs_add kernel/locking/lockdep.c:3214 [inline]
validate_chain kernel/locking/lockdep.c:3830 [inline]
__lock_acquire+0x150e/0x2820 kernel/locking/lockdep.c:5063
lock_acquire+0xf4/0x300 kernel/locking/lockdep.c:5678
console_lock_spinning_enable kernel/printk/printk.c:1818 [inline]
console_emit_next_record+0x30e/0x490 kernel/printk/printk.c:2774
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0xf9/0x210 kernel/printk/printk.c:2906
vprintk_emit+0x297/0x3f0 kernel/printk/printk.c:2303
_printk+0x54/0x70 kernel/printk/printk.c:2328
__report_bug lib/bug.c:195 [inline]
report_bug+0x118/0x160 lib/bug.c:219
handle_bug+0x3a/0x70 arch/x86/kernel/traps.c:324
exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:345
asm_exc_invalid_op+0x16/0x20 arch/x86/include/asm/idtentry.h:606
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1353 [inline]
RIP: 0010:update_rq_clock+0x9e/0xc0 kernel/sched/core.c:734
Code: ff 3f 00 48 21 c1 48 63 83 e0 0a 00 00 48 8b 04 c5 80 18 20 83 48 0f af 88 78 ae 01 00 48 c1 f9 0a 48 01 8b 48 0a 00 00 5b c3 <0f> 0b f6 83 00 0a 00 00 02 74 92 eb f1 48 89 df 5b e9 bc a1 00 00
RSP: 0018:ffffc900000d3e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88813bd2c280 RCX: 9838e4e9d2040100
RDX: ffff88813bd2c280 RSI: ffffffff831daab3 RDI: ffffffff83104234
RBP: ffffc900000d3ed8 R08: 00000000e8ba357a R09: 0000000fba540481
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000002 R14: ffff88813bc2c280 R15: ffffffff831fb790
pick_next_task kernel/sched/core.c:6052 [inline]
__schedule+0xc5d/0x1200 kernel/sched/core.c:6526
schedule+0x50/0x80 kernel/sched/core.c:6639
smpboot_thread_fn+0x162/0x200 kernel/smpboot.c:160
kthread+0xd7/0xf0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
WARNING: CPU: 0 PID: 16 at kernel/sched/sched.h:1353 update_rq_clock+0x9e/0xc0 kernel/sched/core.c:750
Modules linked in:
CPU: 0 PID: 16 Comm: migration/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Stopper: 0x0 <- 0x0
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1353 [inline]
RIP: 0010:update_rq_clock+0x9e/0xc0 kernel/sched/core.c:734
Code: ff 3f 00 48 21 c1 48 63 83 e0 0a 00 00 48 8b 04 c5 80 18 20 83 48 0f af 88 78 ae 01 00 48 c1 f9 0a 48 01 8b 48 0a 00 00 5b c3 <0f> 0b f6 83 00 0a 00 00 02 74 92 eb f1 48 89 df 5b e9 bc a1 00 00
RSP: 0018:ffffc900000d3e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88813bd2c280 RCX: 9838e4e9d2040100
RDX: ffff88813bd2c280 RSI: ffffffff831daab3 RDI: ffffffff83104234
RBP: ffffc900000d3ed8 R08: 00000000e8ba357a R09: 0000000fba540481
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000002 R14: ffff88813bc2c280 R15: ffffffff831fb790
FS: 0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd24d1446f1 CR3: 00000001116c4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
pick_next_task kernel/sched/core.c:6052 [inline]
__schedule+0xc5d/0x1200 kernel/sched/core.c:6526
schedule+0x50/0x80 kernel/sched/core.c:6639
smpboot_thread_fn+0x162/0x200 kernel/smpboot.c:160
kthread+0xd7/0xf0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295