ci2 starts bisection 2025-12-15 07:15:45.534047547 +0000 UTC m=+1619157.711170734
bisecting fixing commit since 3f5b4c104b7d3267d015daf9d9681c5fe3b01224
building syzkaller on fc9d8ee542c85682943812ee52a252cbc934118d
ensuring issue is reproducible on original commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224
testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 6c5bb4d1f33d49b7e636b6be79e0aebfee11da4b0e7b3af450c67498cb6b31a2
all runs: crashed: INFO: task hung in sync_inodes_sb
representative crash: INFO: task hung in sync_inodes_sb, types: [HANG]
check whether we can drop unnecessary instrumentation
disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: a9d2d24a34c31746e64e11a6e428b95ff64e7184568cfb0a83d52c01696e817a
all runs: crashed: INFO: task hung in sync_inodes_sb
representative crash: INFO: task hung in sync_inodes_sb, types: [HANG]
the bug reproduces without the instrumentation
disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
kconfig minimization: base=3913 full=7684 leaves diff=2100
split chunks (needed=false): <2100>
split chunk #0 of len 2100 into 5 parts
testing without sub-chunk 1/5
disabling configs for [kasan locking atomic_sleep memleak ubsan bug_or_warning], they are not needed
testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: f08c2b9d9d4178ae8590e33fb969f6f3b49c07d5d2d587931a7113ba7a7cfa1e
all runs: crashed: INFO: task hung in sync_inodes_sb
representative crash: INFO: task hung in sync_inodes_sb, types: [HANG]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [kasan locking atomic_sleep memleak ubsan bug_or_warning], they are not needed
testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 5a1940a5ec5a85675e0cfb017937e019cd4bdd4e44859c6bb0099dff0a6e9bec
all runs: crashed: INFO: task hung in sync_inodes_sb
representative crash: INFO: task hung in sync_inodes_sb, types: [HANG]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep memleak], they are not needed
testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 72670a802c99f8b3662f5d8c3289b63d1caf233bf3462a8a5139a42c561f904e
all runs: OK
false negative chance: 0.000
testing without sub-chunk 4/5
disabling configs for [bug_or_warning kasan locking atomic_sleep memleak ubsan], they are not needed
testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: a6ef516cdd5ee096ae079ce548708cb54f3dfa2882d6db47d4eb2a601008727e
all runs: crashed: INFO: task hung in sync_inodes_sb
representative crash: INFO: task hung in sync_inodes_sb, types: [HANG]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit 3f5b4c104b7d3267d015daf9d9681c5fe3b01224 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 9be6cea6caf0fda61661adc1d642a70da214101a6ecbabde27e49a4dbee2ca94
all runs: crashed: INFO: task hung in sync_inodes_sb
representative crash: INFO: task hung in sync_inodes_sb, types: [HANG]
the chunk can be dropped
minimized to 420 configs; suspects: [AX25 BRIDGE BRIDGE_NETFILTER CAN CFG80211 CHECKPOINT_RESTORE DVB_CORE FB_CORE FSCACHE HAMRADIO HID_NINTENDO HSR INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_USER_ACCESS INPUT_JOYSTICK INPUT_MOUSE IP6_NF_RAW IPV6_MULTIPLE_TABLES IP_NF_RAW IP_SET IP_VS IP_VS_NQ IP_VS_OVF IP_VS_PE_SIP IP_VS_PROTO_AH IP_VS_PROTO_AH_ESP IP_VS_PROTO_ESP IP_VS_PROTO_SCTP IP_VS_PROTO_UDP IP_VS_RR IP_VS_SED IP_VS_SH IP_VS_TWOS IP_VS_WLC IP_VS_WRR IRQ_BYPASS_MANAGER IRQ_POLL IR_IGORPLUGUSB IR_IGUANA IR_IMON IR_IMON_RAW IR_MCEUSB IR_REDRAT3 IR_STREAMZAP IR_TOY IR_TTUSBIR ISDN ISDN_CAPI_MIDDLEWARE JFFS2_CMODE_PRIORITY JFFS2_COMPRESSION_OPTIONS JFFS2_FS JFFS2_FS_POSIX_ACL JFFS2_FS_SECURITY JFFS2_FS_WRITEBUFFER JFFS2_FS_XATTR JFFS2_LZO JFFS2_RTIME JFFS2_RUBIN JFFS2_SUMMARY JFFS2_ZLIB JFS_DEBUG JFS_FS JFS_POSIX_ACL JFS_SECURITY JOYSTICK_IFORCE JOYSTICK_IFORCE_USB JOYSTICK_PXRC JOYSTICK_XPAD JOYSTICK_XPAD_FF JOYSTICK_XPAD_LEDS KARMA_PARTITION KCOV KCOV_ENABLE_COMPARISONS KCOV_INSTRUMENT_ALL KEYS_REQUEST_CACHE KEY_DH_OPERATIONS KEY_NOTIFICATIONS KSM KVM KVM_AMD KVM_ASYNC_PF KVM_COMPAT KVM_GENERIC_DIRTYLOG_READ_PROTECT KVM_GENERIC_HARDWARE_ENABLING KVM_MMIO KVM_PROVE_MMU KVM_VFIO KVM_XEN KVM_XFER_TO_GUEST_WORK L2TP L2TP_ETH L2TP_IP L2TP_V3 LAPB LAPBETHER LDM_PARTITION LEDS_TRIGGER_AUDIO LEGACY_PTYS LIBCRC32C LIBNVDIMM LINEAR_RANGES LLC LLC2 LOGIG940_FF LOGIRUMBLEPAD2_FF LOGO LOGO_LINUX_MONO LOGO_LINUX_VGA16 LPC_ICH LWTUNNEL LWTUNNEL_BPF LZ4HC_COMPRESS LZ4_COMPRESS MAC80211 MAC80211_DEBUGFS MAC80211_HAS_RC MAC80211_HWSIM MAC80211_MESH MAC80211_RC_DEFAULT_MINSTREL MAC80211_RC_MINSTREL MACSEC MACVLAN MACVTAP MAC_PARTITION MAPPING_DIRTY_HELPERS MDIO_MVUSB MD_LINEAR MD_MULTIPATH MD_RAID0 MD_RAID1 MD_RAID10 MD_RAID456 MEDIA_ANALOG_TV_SUPPORT MEDIA_ATTACH MEDIA_CONTROLLER MEDIA_CONTROLLER_DVB MEDIA_CONTROLLER_REQUEST_API MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_SUPPORT_FILTER MEDIA_TUNER MEDIA_TUNER_MSI001 MEMORY_BALLOON MEMORY_HOTPLUG MEMORY_HOTPLUG_DEFAULT_ONLINE MEMORY_ISOLATION MEMREGION MEMSTICK MEMSTICK_REALTEK_USB MEM_SOFT_DIRTY MFD_CORE MFD_SYSCON MHI_BUS MHI_WWAN_CTRL MHP_MEMMAP_ON_MEMORY MICROCHIP_PHY MINIX_FS MINIX_SUBPARTITION MISC_RTSX MISC_RTSX_USB MISDN MISDN_DSP MISDN_HFCUSB MISDN_L1OIP MKISS MLX4_CORE MLX4_INFINIBAND MMC MMC_REALTEK_USB MMC_USHC MMC_VUB300 MMU_NOTIFIER MODULE_SRCVERSION_ALL MODVERSIONS MOST MOST_USB_HDM MOUSE_APPLETOUCH MOUSE_BCM5974 MOUSE_PS2 MOUSE_PS2_ALPS MOUSE_PS2_BYD MOUSE_PS2_CYPRESS MOUSE_PS2_FOCALTECH MOUSE_PS2_LIFEBOOK MOUSE_PS2_LOGIPS2PP MOUSE_PS2_SMBUS MOUSE_PS2_SYNAPTICS MOUSE_PS2_SYNAPTICS_SMBUS MOUSE_PS2_TRACKPOINT MOUSE_SYNAPTICS_USB MPLS MPLS_IPTUNNEL MPLS_ROUTING MPTCP MPTCP_IPV6 MRP MTD MTD_BLKDEVS MTD_BLOCK MTD_BLOCK2MTD MTD_CFI_I1 MTD_CFI_I2 MTD_MAP_BANK_WIDTH_1 MTD_MAP_BANK_WIDTH_2 MTD_MAP_BANK_WIDTH_4 MTD_MTDRAM MTD_PHRAM MTD_SLRAM MUSB_PIO_ONLY ND_BTT ND_CLAIM ND_PFN NETDEVSIM NETFILTER_ADVANCED NETFILTER_BPF_LINK NETFILTER_FAMILY_ARP NETFILTER_FAMILY_BRIDGE NETFILTER_NETLINK_ACCT NETFILTER_NETLINK_GLUE_CT NETFILTER_NETLINK_OSF NETFILTER_NETLINK_QUEUE NETFILTER_SYNPROXY NETFILTER_XTABLES_COMPAT NETFILTER_XT_CONNMARK NETFILTER_XT_MATCH_BPF NETFILTER_XT_MATCH_CGROUP NETFILTER_XT_MATCH_CLUSTER NETFILTER_XT_MATCH_COMMENT NETFILTER_XT_MATCH_CONNBYTES NETFILTER_XT_MATCH_CONNLABEL NETFILTER_XT_MATCH_CONNLIMIT NETFILTER_XT_MATCH_CONNMARK NETFILTER_XT_MATCH_CPU NETFILTER_XT_MATCH_DCCP NETFILTER_XT_MATCH_DEVGROUP NETFILTER_XT_MATCH_DSCP NETFILTER_XT_MATCH_ECN NETFILTER_XT_MATCH_ESP NETFILTER_XT_MATCH_HASHLIMIT NETFILTER_XT_MATCH_HELPER NETFILTER_XT_MATCH_HL NETFILTER_XT_MATCH_IPCOMP NETFILTER_XT_MATCH_IPRANGE NETFILTER_XT_MATCH_IPVS NETFILTER_XT_MATCH_L2TP NETFILTER_XT_MATCH_LENGTH NETFILTER_XT_MATCH_LIMIT NETFILTER_XT_MATCH_MAC NETFILTER_XT_MATCH_MARK NETFILTER_XT_MATCH_MULTIPORT NETFILTER_XT_MATCH_NFACCT NETFILTER_XT_MATCH_OSF NETFILTER_XT_MATCH_OWNER NETFILTER_XT_MATCH_PHYSDEV NETFILTER_XT_MATCH_PKTTYPE NETFILTER_XT_MATCH_QUOTA NETFILTER_XT_MATCH_RATEEST NETFILTER_XT_MATCH_REALM NETFILTER_XT_MATCH_RECENT NETFILTER_XT_MATCH_SCTP NETFILTER_XT_MATCH_SOCKET NETFILTER_XT_MATCH_STATISTIC NETFILTER_XT_MATCH_STRING NETFILTER_XT_MATCH_TCPMSS NETFILTER_XT_MATCH_TIME NETFILTER_XT_MATCH_U32 NETFILTER_XT_SET NETFILTER_XT_TARGET_AUDIT NETFILTER_XT_TARGET_CHECKSUM NETFILTER_XT_TARGET_CLASSIFY NETFILTER_XT_TARGET_CONNMARK NETFILTER_XT_TARGET_CT NETFILTER_XT_TARGET_DSCP NETFILTER_XT_TARGET_HL NETFILTER_XT_TARGET_HMARK NETFILTER_XT_TARGET_IDLETIMER NETFILTER_XT_TARGET_LED NETFILTER_XT_TARGET_MARK NETFILTER_XT_TARGET_NETMAP NETFILTER_XT_TARGET_NFQUEUE NETFILTER_XT_TARGET_NOTRACK NETFILTER_XT_TARGET_RATEEST NETFILTER_XT_TARGET_REDIRECT NETFILTER_XT_TARGET_TCPOPTSTRIP NETFILTER_XT_TARGET_TEE NETFILTER_XT_TARGET_TPROXY NETFILTER_XT_TARGET_TRACE NETLABEL NETLINK_DIAG NETROM NET_9P_RDMA NET_ACT_BPF NET_ACT_CONNMARK NET_ACT_CSUM NET_ACT_CT NET_ACT_CTINFO NET_ACT_GATE NET_ACT_IFE NET_ACT_IPT NET_ACT_MPLS NET_ACT_NAT NET_ACT_PEDIT NET_ACT_POLICE NET_ACT_SAMPLE NET_ACT_SIMP NET_ACT_SKBEDIT NET_ACT_SKBMOD NET_ACT_TUNNEL_KEY NET_ACT_VLAN NET_CLS_BASIC NET_CLS_BPF NET_CLS_FLOW NET_CLS_FLOWER NET_CLS_FW NET_CLS_MATCHALL NET_CLS_ROUTE4 NET_DEVLINK NET_DROP_MONITOR NET_DSA NET_DSA_TAG_BRCM NET_DSA_TAG_BRCM_COMMON NET_DSA_TAG_BRCM_PREPEND NET_DSA_TAG_MTK NET_DSA_TAG_QCA NET_DSA_TAG_RTL4_A NET_EMATCH_CANID NET_EMATCH_CMP NET_EMATCH_IPSET NET_EMATCH_IPT NET_EMATCH_META NET_EMATCH_NBYTE NET_EMATCH_TEXT NET_EMATCH_U32 NET_FC NET_FOU NET_FOU_IP_TUNNELS NET_IFE NET_IFE_SKBMARK NET_IFE_SKBPRIO NET_IFE_SKBTCINDEX NET_IPGRE NET_IPGRE_BROADCAST NET_IPGRE_DEMUX NET_IPIP NET_IPVTI NET_KEY NET_KEY_MIGRATE NET_L3_MASTER_DEV NET_MPLS_GSO NET_NCSI NET_NSH NET_REDIRECT NET_SCH_CAKE NET_SCH_CBS NET_SCH_CHOKE NET_SCH_CODEL NET_SCH_DRR NET_SCH_ETF NET_SCH_ETS NET_SCH_FQ NET_SCH_FQ_CODEL NET_SCH_FQ_PIE NET_SCH_GRED NET_SCH_HFSC NET_SCH_HHF NET_SCH_HTB NET_SCH_INGRESS NET_SCH_MQPRIO NET_SCH_MQPRIO_LIB NET_SCH_MULTIQ NET_SCH_NETEM NET_SCH_PIE NET_SCH_PLUG NET_SCH_PRIO NET_SCH_QFQ NET_SCH_RED NET_SCH_SFB NET_SCH_SFQ NET_SCH_SKBPRIO NET_SCH_TAPRIO NET_SCH_TBF NET_SCH_TEQL NET_SOCK_MSG NET_SWITCHDEV NET_TC_SKB_EXT NET_TEAM NET_TEAM_MODE_ACTIVEBACKUP NET_TEAM_MODE_BROADCAST NET_TEAM_MODE_LOADBALANCE NET_TEAM_MODE_RANDOM NET_TEAM_MODE_ROUNDROBIN NET_UDP_TUNNEL NET_VRF NFC NFC_DIGITAL NFC_FDP NFC_HCI NFC_MRVL NFC_MRVL_USB NFC_NCI NFC_NCI_UART NFC_PN533 NFC_PN533_USB NFC_PORT100 NFC_SHDLC NFC_SIM NFC_VIRTUAL_NCI NFSD NFSD_BLOCKLAYOUT NFSD_FLEXFILELAYOUT NFSD_PNFS NFSD_SCSILAYOUT NFSD_V3_ACL NFSD_V4 NFSD_V4_2_INTER_SSC NFSD_V4_SECURITY_LABEL NFS_FSCACHE NFS_V4_1 NFS_V4_2 NFS_V4_2_READ_PLUS NFS_V4_2_SSC_HELPER NFS_V4_SECURITY_LABEL NFT_BRIDGE_META NFT_BRIDGE_REJECT NFT_COMPAT NFT_CONNLIMIT NFT_CT NFT_DUP_IPV4 NFT_DUP_IPV6 NFT_DUP_NETDEV NFT_FIB NFT_FIB_INET NFT_FIB_IPV4 NFT_FIB_IPV6 NFT_FIB_NETDEV NFT_FLOW_OFFLOAD NFT_HASH NFT_LIMIT NFT_LOG NFT_MASQ NFT_NAT NFT_NUMGEN NFT_OSF NFT_QUEUE NFT_QUOTA NFT_REDIR NFT_REJECT NFT_REJECT_INET NFT_REJECT_IPV4 NFT_REJECT_IPV6 NFT_REJECT_NETDEV NFT_SOCKET NFT_SYNPROXY NFT_TPROXY NFT_TUNNEL NFT_XFRM NF_CONNTRACK_AMANDA NF_CONNTRACK_BRIDGE NF_CONNTRACK_BROADCAST NF_CONNTRACK_EVENTS NF_CONNTRACK_H323 NF_CONNTRACK_LABELS NF_CONNTRACK_MARK NF_CONNTRACK_NETBIOS_NS NF_CONNTRACK_OVS NF_CONNTRACK_PPTP NF_CONNTRACK_SANE NF_CONNTRACK_SNMP NF_CONNTRACK_TFTP NF_CONNTRACK_TIMEOUT NF_CONNTRACK_TIMESTAMP NF_CONNTRACK_ZONES NF_CT_NETLINK_HELPER NF_CT_NETLINK_TIMEOUT NF_CT_PROTO_DCCP NF_CT_PROTO_GRE NF_CT_PROTO_SCTP NF_CT_PROTO_UDPLITE NF_DUP_IPV4 NF_DUP_IPV6 NF_DUP_NETDEV NF_FLOW_TABLE NF_FLOW_TABLE_INET NF_NAT_AMANDA NF_NAT_H323 NF_NAT_OVS 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_BRIDGE NF_TABLES_INET NF_TABLES_IPV4 NF_TABLES_IPV6 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 PARTITION_ADVANCED PSAMPLE RC_CORE RC_DEVICES RFKILL SPI USB_GADGET USB_MUSB_HDRC VIDEO_DEV WAN WATCH_QUEUE WIRELESS WLAN WWAN X25]
disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing current HEAD 5fa4793a2d2d70ad08b85387b41020f1fcc2d19e
testing commit 5fa4793a2d2d70ad08b85387b41020f1fcc2d19e gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: fd866b0e763247a05cfa2c154943455f65692e1371ffb49e59092ccce448e835
all runs: crashed: INFO: task hung in sync_inodes_sb
representative crash: INFO: task hung in sync_inodes_sb, types: [HANG]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 1h57m22.866108619s (build: 42m42.141569696s, test: 1h6m7.172775874s)
crash still not fixed or there were kernel test errors
commit msg: Linux 6.6.119
crash: INFO: task hung in sync_inodes_sb
INFO: task syz-executor:4381 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:11672 pid:4381 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x6a2/0x990 kernel/sched/core.c:6699
schedule+0x54/0xc0 kernel/sched/core.c:6773
wb_wait_for_completion+0x9e/0x100 fs/fs-writeback.c:192
sync_inodes_sb+0xd9/0x380 fs/fs-writeback.c:2772
sync_filesystem+0xaf/0x100 fs/sync.c:64
generic_shutdown_super+0x2c/0x170 fs/super.c:666
kill_block_super+0x1e/0x50 fs/super.c:1660
deactivate_locked_super+0x4d/0x180 fs/super.c:481
cleanup_mnt+0x175/0x1d0 fs/namespace.c:1259
task_work_run+0xe7/0x120 kernel/task_work.c:239
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x465/0xfe0 kernel/exit.c:883
do_group_exit+0xe6/0xf0 kernel/exit.c:1024
__do_sys_exit_group kernel/exit.c:1035 [inline]
__se_sys_exit_group kernel/exit.c:1033 [inline]
__x64_sys_exit_group+0x12/0x20 kernel/exit.c:1033
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f20b004e929
RSP: 002b:00007ffd68b0d758 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f20b00d09a9 RCX: 00007f20b004e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000027 R08: 00007ffd68b0b4f6 R09: 00007ffd68b0ea10
R10: 000000000000000a R11: 0000000000000246 R12: 00007ffd68b0ea10
R13: 00007f20b00d0925 R14: 000055558d18a4a8 R15: 00007ffd68b10bd0
Showing all locks held in the system:
2 locks held by kworker/u4:0/11:
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
#1: ffffc90000063e38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90000063e38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
2 locks held by kworker/u4:1/13:
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
#1: ffffc90000073e38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90000073e38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
1 lock held by khungtaskd/28:
#0: ffffffff839a9ff8 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff839a9ff8 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff839a9ff8 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6633
2 locks held by kworker/u4:2/34:
2 locks held by kworker/u4:3/45:
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
#1: ffffc90000197e38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90000197e38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
2 locks held by kworker/u4:4/65:
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
#1: ffffc900001bfe38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc900001bfe38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
2 locks held by kworker/u4:5/1450:
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888104245538 ((wq_completion)writeback){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
#1: ffffc9000384fe38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc9000384fe38 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
2 locks held by kworker/u4:8/1639:
2 locks held by getty/1909:
#0: ffff8881017c30a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x50 drivers/tty/tty_ldisc.c:243
#1: ffffc90003f6b2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x23b/0xba0 drivers/tty/n_tty.c:2217
2 locks held by syz-executor/4381:
#0: ffff88811f1ce0e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88811f1ce0e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88811f1ce0e0 (&type->s_umount_key#45){....}-{3:3}, at: deactivate_super+0x7a/0x90 fs/super.c:513
#1: ffff888105eab7d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff888105eab7d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: sync_inodes_sb+0xc0/0x380 fs/fs-writeback.c:2770
2 locks held by syz-executor/5482:
#0: ffff8881007b10e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8881007b10e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8881007b10e0 (&type->s_umount_key#45){....}-{3:3}, at: deactivate_super+0x7a/0x90 fs/super.c:513
#1: ffff888105ea87d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff888105ea87d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: sync_inodes_sb+0xc0/0x380 fs/fs-writeback.c:2770
2 locks held by syz-executor/6104:
#0: ffff8881036800e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8881036800e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8881036800e0 (&type->s_umount_key#45){....}-{3:3}, at: deactivate_super+0x7a/0x90 fs/super.c:513
#1: ffff888105eac7d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff888105eac7d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: sync_inodes_sb+0xc0/0x380 fs/fs-writeback.c:2770
2 locks held by syz-executor/6763:
#0: ffff88810a3ee0e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88810a3ee0e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88810a3ee0e0 (&type->s_umount_key#45){....}-{3:3}, at: deactivate_super+0x7a/0x90 fs/super.c:513
#1: ffff888105ea97d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff888105ea97d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: sync_inodes_sb+0xc0/0x380 fs/fs-writeback.c:2770
2 locks held by segctord/7204:
2 locks held by syz-executor/7368:
#0: ffff88810bfac0e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88810bfac0e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88810bfac0e0 (&type->s_umount_key#45){....}-{3:3}, at: deactivate_super+0x7a/0x90 fs/super.c:513
#1: ffff888103a5c7d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff888103a5c7d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: sync_inodes_sb+0xc0/0x380 fs/fs-writeback.c:2770
2 locks held by segctord/7871:
#0: ffff888237d2d058 (&rq->__lock){....}-{2:2}, at: nilfs_transaction_lock+0xc5/0x350 fs/nilfs2/segment.c:357
#1: ffff88811eafc608 (&sci->sc_wait_daemon){....}-{2:2}, at: prepare_to_wait+0x1f/0xa0 kernel/sched/wait.c:274
2 locks held by syz-executor/8030:
#0: ffff88811f1c80e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88811f1c80e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88811f1c80e0 (&type->s_umount_key#45){....}-{3:3}, at: deactivate_super+0x7a/0x90 fs/super.c:513
#1: ffff88810924d7d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff88810924d7d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: sync_inodes_sb+0xc0/0x380 fs/fs-writeback.c:2770
2 locks held by syz-executor/8703:
#0: ffff88810a7900e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88810a7900e0 (&type->s_umount_key#45){....}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88810a7900e0 (&type->s_umount_key#45){....}-{3:3}, at: deactivate_super+0x7a/0x90 fs/super.c:513
#1: ffff8881092487d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff8881092487d0 (&bdi->wb_switch_rwsem){....}-{3:3}, at: sync_inodes_sb+0xc0/0x380 fs/fs-writeback.c:2770
2 locks held by kworker/u4:11/9227:
#0: ffff88810006ab38 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff88810006ab38 ((wq_completion)events_unbound){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
#1: ffffc90001d3fe38 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90001d3fe38 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_scheduled_works+0x32a/0x850 kernel/workqueue.c:2711
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0xeb/0x180 lib/dump_stack.c:106
nmi_cpu_backtrace+0x224/0x240 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0xea/0x1f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0x8cb/0x900 kernel/hung_task.c:379
kthread+0x114/0x140 kernel/kthread.c:388
ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5875 Comm: segctord Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:94 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:108 [inline]
RIP: 0010:lock_release+0x88/0x2d0 kernel/locking/lockdep.c:5770
Code: 00 65 4c 8b 3d 59 31 e1 7e 41 83 bf 04 0a 00 00 00 0f 85 cb 01 00 00 48 c7 44 24 18 00 00 00 00 9c 8f 44 24 18 48 8b 5c 24 18 48 c7 c7 69 35 4f 83 e8 0b 83 a5 01 65 ff 05 54 33 e0 7e c7 44
RSP: 0018:ffffc90001b07b20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000246 RCX: 9fa1ba3d7806a900
RDX: 0000000000000000 RSI: ffffffff834f352b RDI: ffffffff835fc10d
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000002a2
R10: 0000000000000001 R11: 0000000000000000 R12: ffffea000472f9c0
R13: ffffffff8159b9de R14: ffff8881104c2050 R15: ffff888106ef5280
FS: 0000000000000000(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc4ca44c64 CR3: 0000000003874000 CR4: 00000000003506e0
Call Trace:
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x16/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
__find_get_block_slow fs/buffer.c:239 [inline]
__find_get_block+0x27e/0x7c0 fs/buffer.c:1413
__getblk_gfp+0x31/0x450 fs/buffer.c:1435
sb_getblk include/linux/buffer_head.h:344 [inline]
nilfs_segbuf_extend_segsum+0x38/0x160 fs/nilfs2/segbuf.c:99
nilfs_segbuf_reset+0x35/0x80 fs/nilfs2/segbuf.c:135
nilfs_segctor_reset_segment_buffer fs/nilfs2/segment.c:421 [inline]
nilfs_segctor_collect fs/nilfs2/segment.c:1531 [inline]
nilfs_segctor_do_construct+0x70a/0x3dd0 fs/nilfs2/segment.c:2091
nilfs_segctor_construct+0xae/0x410 fs/nilfs2/segment.c:2454
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2562 [inline]
nilfs_segctor_thread+0x465/0x690 fs/nilfs2/segment.c:2646
kthread+0x114/0x140 kernel/kthread.c:388
ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293