ci starts bisection 2025-11-13 21:56:01.314558333 +0000 UTC m=+114964.662114266
bisecting fixing commit since 2014c95afecee3e76ca4a56956a936e23283f05b
building syzkaller on a21a8419b67b5ef8ebc3d6dd834d065e6860c41f
ensuring issue is reproducible on original commit 2014c95afecee3e76ca4a56956a936e23283f05b
testing commit 2014c95afecee3e76ca4a56956a936e23283f05b gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: db98a3b46511db7a0ec0744bd2eb7bf5e97a01f6592d49d02e0e8fd18ad6c965
run #0: crashed: INFO: task hung in hugetlbfs_zero_partial_page
run #1: crashed: INFO: task hung in hugetlbfs_zero_partial_page
run #2: crashed: INFO: task hung in rmap_walk_file
run #3: crashed: INFO: task hung in rmap_walk_file
run #4: crashed: INFO: task hung in rmap_walk_file
run #5: crashed: INFO: task hung in rmap_walk_file
run #6: crashed: INFO: task hung in rmap_walk_file
run #7: crashed: INFO: task hung in rmap_walk_file
run #8: crashed: INFO: task hung in rmap_walk_file
run #9: crashed: INFO: task hung in rmap_walk_file
run #10: crashed: INFO: task hung in rmap_walk_file
run #11: crashed: INFO: task hung in rmap_walk_file
run #12: crashed: INFO: task hung in rmap_walk_file
run #13: crashed: INFO: task hung in rmap_walk_file
run #14: crashed: INFO: task hung in rmap_walk_file
run #15: crashed: INFO: task hung in rmap_walk_file
run #16: crashed: INFO: task hung in rmap_walk_file
run #17: crashed: INFO: task hung in rmap_walk_file
run #18: crashed: INFO: task hung in rmap_walk_file
run #19: crashed: INFO: task hung in rmap_walk_file
representative crash: INFO: task hung in hugetlbfs_zero_partial_page, types: [HANG]
check whether we can drop unnecessary instrumentation
disabling configs for [bug_or_warning kasan locking atomic_sleep memleak ubsan], they are not needed
testing commit 2014c95afecee3e76ca4a56956a936e23283f05b gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: f88f9180a3eea2194f818ad0fff4fbbaa5a2bdd1db7e1b27607aab821115d499
run #0: crashed: INFO: task hung in rmap_walk_file
run #1: crashed: INFO: task hung in rmap_walk_file
run #2: crashed: INFO: task hung in rmap_walk_file
run #3: crashed: INFO: task hung in rmap_walk_file
run #4: crashed: INFO: task hung in rmap_walk_file
run #5: crashed: INFO: task hung in rmap_walk_file
run #6: crashed: INFO: task hung in rmap_walk_file
run #7: crashed: INFO: task hung in rmap_walk_file
run #8: crashed: INFO: task hung in rmap_walk_file
run #9: OK
representative crash: INFO: task hung in rmap_walk_file, types: [HANG]
the bug reproduces without the instrumentation
disabling configs for [bug_or_warning kasan locking atomic_sleep memleak ubsan], they are not needed
kconfig minimization: base=4116 full=8264 leaves diff=2158
split chunks (needed=false): <2158>
split chunk #0 of len 2158 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 2014c95afecee3e76ca4a56956a936e23283f05b gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 529cdc641c0934955eedfac18edf85b328d94285f67cf4ae990b76cfba4ccba5
all runs: crashed: INFO: task hung in rmap_walk_file
representative crash: INFO: task hung in rmap_walk_file, 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 2014c95afecee3e76ca4a56956a936e23283f05b gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 0170ba35300123ffd27a892c577c0e8cca1b9e863db6738c03f1294114498a7d
all runs: crashed: INFO: task hung in rmap_walk_file
representative crash: INFO: task hung in rmap_walk_file, types: [HANG]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [bug_or_warning kasan locking atomic_sleep memleak ubsan], they are not needed
testing commit 2014c95afecee3e76ca4a56956a936e23283f05b gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 33e86045f9d6f0ebe59bb655c0bfc78195180c639c5b6fcdc13d7a773560fdd8
run #0: crashed: INFO: task hung in rmap_walk_file
run #1: crashed: INFO: task hung in rmap_walk_file
run #2: crashed: INFO: task hung in rmap_walk_file
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
representative crash: INFO: task hung in rmap_walk_file, types: [HANG]
testing without sub-chunk 4/5
disabling configs for [locking atomic_sleep memleak ubsan bug_or_warning kasan], they are not needed
testing commit 2014c95afecee3e76ca4a56956a936e23283f05b gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: c79e4fbbbb6589507a6ee2330812b7452b1f8a3ecac51625428753472cc42c8e
all runs: crashed: INFO: task hung in rmap_walk_file
representative crash: INFO: task hung in rmap_walk_file, types: [HANG]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [atomic_sleep memleak ubsan bug_or_warning kasan locking], they are not needed
testing commit 2014c95afecee3e76ca4a56956a936e23283f05b gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: 847412aa7cbdb346105075a26ddaccbd0f890f21ec51bb34e736e267a0840f29
all runs: crashed: INFO: task hung in rmap_walk_file
representative crash: INFO: task hung in rmap_walk_file, types: [HANG]
the chunk can be dropped
minimized to 432 configs; suspects: [AX25 BRIDGE BRIDGE_NETFILTER CAN CC_HAS_SANCOV_TRACE_PC CFG80211 CHECKPOINT_RESTORE DVB_CORE FB_CORE HAMRADIO HID_LOGITECH HSR INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_USER_ACCESS INPUT_JOYSTICK INPUT_MOUSE IP6_NF_MANGLE IP6_NF_RAW IPV6_MULTIPLE_TABLES IP_NF_MANGLE IP_NF_RAW IP_SET IP_SET_HASH_IPPORTIP IP_SET_HASH_IPPORTNET IP_SET_HASH_MAC IP_SET_HASH_NET IP_SET_HASH_NETIFACE IP_SET_HASH_NETNET IP_SET_HASH_NETPORT IP_SET_HASH_NETPORTNET IP_SET_LIST_SET IP_VS IP_VS_DH IP_VS_FO IP_VS_FTP IP_VS_IPV6 IP_VS_LBLC IP_VS_LBLCR IP_VS_LC IP_VS_MH IP_VS_NFCT 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_TCP 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_MSI_IOMMU IRQ_POLL IR_IGORPLUGUSB IR_IGUANA IR_IMON IR_IMON_RAW IR_MCEUSB IR_REDRAT3 IR_STREAMZAP IR_TOY IR_TTUSBIR ISDN ISDN_CAPI 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 KALLSYMS_ABSOLUTE_PERCPU 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_COMMON KVM_COMPAT KVM_ELIDE_TLB_FLUSH_IF_YOUNG KVM_GENERIC_DIRTYLOG_READ_PROTECT KVM_GENERIC_HARDWARE_ENABLING KVM_GENERIC_MEMORY_ATTRIBUTES KVM_GENERIC_MMU_NOTIFIER KVM_GENERIC_PRE_FAULT_MEMORY KVM_GENERIC_PRIVATE_MEM KVM_HYPERV KVM_MMIO KVM_PRIVATE_MEM KVM_PROVE_MMU KVM_SW_PROTECTED_VM KVM_VFIO KVM_X86 KVM_XEN KVM_XFER_TO_GUEST_WORK L2TP L2TP_ETH L2TP_IP L2TP_V3 LAPB LAPBETHER LDM_PARTITION LD_IS_BFD LEGACY_PTYS LIBCRC32C LIBNVDIMM LINEAR_RANGES LLC LLC2 LOGIG940_FF LOGIRUMBLEPAD2_FF LOGITECH_FF LOGIWHEELS_FF LOGO LOGO_LINUX_MONO LOGO_LINUX_VGA16 LPC_ICH LWTUNNEL LWTUNNEL_BPF LZ4HC_COMPRESS LZ4_COMPRESS MAC80211 MAC80211_HAS_RC MAC80211_HWSIM MAC80211_MESH MAC80211_RC_DEFAULT_MINSTREL MAC80211_RC_MINSTREL MACSEC MACVLAN MACVTAP MAC_PARTITION MAPPING_DIRTY_HELPERS MCORE2 MDIO_DEVICE MDIO_DEVRES MDIO_MVUSB MD_RAID0 MD_RAID1 MD_RAID10 MD_RAID456 MEDIA_ANALOG_TV_SUPPORT MEDIA_ATTACH MEDIA_CONTROLLER MEDIA_CONTROLLER_DVB 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_ISOLATION MEMREGION MEMSTICK MEMSTICK_REALTEK_USB MEM_SOFT_DIRTY MFD_CORE MFD_SYSCON MHI_BUS MHI_WWAN_CTRL MHP_DEFAULT_ONLINE_TYPE_ONLINE_AUTO MHP_MEMMAP_ON_MEMORY MICROCHIP_PHY MINIX_FS MINIX_SUBPARTITION MIN_HEAP 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 MODULE_SRCVERSION_ALL 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_NAT 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_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_SHAPER 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_TABLES NF_TABLES_BRIDGE NF_TABLES_INET NF_TABLES_IPV4 NF_TABLES_IPV6 NF_TABLES_NETDEV PARTITION_ADVANCED PSAMPLE RC_CORE RC_DEVICES RFKILL SPI USB_GADGET USB_MUSB_HDRC VIDEO_DEV WAN WATCH_QUEUE WIRELESS WLAN WWAN X25 X86_X32_ABI]
disabling configs for [bug_or_warning kasan locking atomic_sleep memleak ubsan], they are not needed
testing current HEAD 9b9e43704d2b05514aeeaea36311addba2c72408
testing commit 9b9e43704d2b05514aeeaea36311addba2c72408 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: a5b253be7b763aa8a9e15f03ce70d33084d82c4df892984b069b01224f802019
all runs: crashed: INFO: task hung in __rmap_walk_file
representative crash: INFO: task hung in __rmap_walk_file, types: [HANG]
crash still not fixed/happens on the oldest tested release
reproducer is flaky (1.00 repro chance estimate)
revisions tested: 8, total time: 4h39m23.916036839s (build: 2h55m21.039154869s, test: 1h17m7.144591424s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'slab-for-6.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab
crash: INFO: task hung in __rmap_walk_file
INFO: task syz.4.339:6552 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.339 state:D stack:13496 pid:6552 tgid:6549 ppid:3845 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x756/0xc50 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xac/0x140 kernel/sched/core.c:7026
schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:7083
rwsem_down_read_slowpath+0x282/0x540 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0x86/0xf0 kernel/locking/rwsem.c:1539
i_mmap_lock_read include/linux/fs.h:568 [inline]
__rmap_walk_file+0x13e/0x380 mm/rmap.c:2905
remove_migration_ptes mm/migrate.c:471 [inline]
unmap_and_move_huge_page mm/migrate.c:1520 [inline]
migrate_hugetlbs mm/migrate.c:1641 [inline]
migrate_pages+0x6e7/0x1450 mm/migrate.c:2080
do_mbind mm/mempolicy.c:1539 [inline]
kernel_mbind mm/mempolicy.c:1682 [inline]
__do_sys_mbind mm/mempolicy.c:1756 [inline]
__se_sys_mbind+0x8bb/0xa50 mm/mempolicy.c:1752
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c2927cda9
RSP: 002b:00007f4c28ce7038 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007f4c29495fa0 RCX: 00007f4c2927cda9
RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000000020001000
RBP: 00007f4c292fe2a0 R08: 0000000000000040 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4c29495fa0 R15: 00007ffed60b8f38
INFO: task syz.4.339:6567 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.339 state:D stack:13832 pid:6567 tgid:6549 ppid:3845 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x756/0xc50 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xac/0x140 kernel/sched/core.c:7026
io_schedule+0x3f/0x60 kernel/sched/core.c:7871
folio_wait_bit_common+0x36b/0x650 mm/filemap.c:1330
__folio_lock mm/filemap.c:1706 [inline]
folio_lock include/linux/pagemap.h:1141 [inline]
__filemap_get_folio+0x11c/0x7d0 mm/filemap.c:1960
filemap_lock_folio include/linux/pagemap.h:820 [inline]
filemap_lock_hugetlb_folio include/linux/hugetlb.h:814 [inline]
hugetlbfs_zero_partial_page+0x42/0x210 fs/hugetlbfs/inode.c:645
hugetlbfs_punch_hole fs/hugetlbfs/inode.c:699 [inline]
hugetlbfs_fallocate+0x634/0x8c0 fs/hugetlbfs/inode.c:732
vfs_fallocate+0x34c/0x390 fs/open.c:342
madvise_remove mm/madvise.c:1049 [inline]
madvise_vma_behavior+0x48c/0x19c0 mm/madvise.c:1346
madvise_walk_vmas mm/madvise.c:1669 [inline]
madvise_do_behavior+0x49f/0x7a0 mm/madvise.c:1885
do_madvise+0x1e5/0x270 mm/madvise.c:1978
__do_sys_madvise mm/madvise.c:1987 [inline]
__se_sys_madvise mm/madvise.c:1985 [inline]
__x64_sys_madvise+0x2d/0x40 mm/madvise.c:1985
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c2927cda9
RSP: 002b:00007f4c28cc6038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f4c29496080 RCX: 00007f4c2927cda9
RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000000020000000
RBP: 00007f4c292fe2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f4c29496080 R15: 00007ffed60b8f38
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff83fb4450 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff83fb4450 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff83fb4450 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:8/1736:
#0: ffff88810007c948 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff88810007c948 ((wq_completion)events_unbound){....}-{0:0}, at: process_scheduled_works+0x34c/0x8c0 kernel/workqueue.c:3346
#1: ffffc90001cbbe28 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc90001cbbe28 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_scheduled_works+0x373/0x8c0 kernel/workqueue.c:3346
2 locks held by getty/1947:
#0: ffff88810f6b08a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x50 drivers/tty/tty_ldisc.c:243
#1: ffffc90002eef2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x257/0xba0 drivers/tty/n_tty.c:2222
5 locks held by kworker/u8:9/3887:
1 lock held by syz.4.339/6552:
#0: ffff8881032ef590 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: i_mmap_lock_read include/linux/fs.h:568 [inline]
#0: ffff8881032ef590 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: __rmap_walk_file+0x13e/0x380 mm/rmap.c:2905
3 locks held by syz.4.339/6567:
#0: ffff88810328c3f8 (sb_writers#12){....}-{0:0}, at: vfs_fallocate+0x330/0x390 fs/open.c:341
#1: ffff8881032ef2c8 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: inode_lock include/linux/fs.h:980 [inline]
#1: ffff8881032ef2c8 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:674 [inline]
#1: ffff8881032ef2c8 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: hugetlbfs_fallocate+0x172/0x8c0 fs/hugetlbfs/inode.c:732
#2: ffff8881032ef590 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: i_mmap_lock_write include/linux/fs.h:548 [inline]
#2: ffff8881032ef590 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:682 [inline]
#2: ffff8881032ef590 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: hugetlbfs_fallocate+0x216/0x8c0 fs/hugetlbfs/inode.c:732
1 lock held by syz.7.17064/13351:
#0: ffff8881284fe390 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: i_mmap_lock_read include/linux/fs.h:568 [inline]
#0: ffff8881284fe390 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: __rmap_walk_file+0x13e/0x380 mm/rmap.c:2905
3 locks held by syz.7.17064/13381:
#0: ffff88810328c3f8 (sb_writers#12){....}-{0:0}, at: vfs_fallocate+0x330/0x390 fs/open.c:341
#1: ffff8881284fe0c8 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: inode_lock include/linux/fs.h:980 [inline]
#1: ffff8881284fe0c8 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:674 [inline]
#1: ffff8881284fe0c8 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: hugetlbfs_fallocate+0x172/0x8c0 fs/hugetlbfs/inode.c:732
#2: ffff8881284fe390 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: i_mmap_lock_write include/linux/fs.h:548 [inline]
#2: ffff8881284fe390 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:682 [inline]
#2: ffff8881284fe390 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: hugetlbfs_fallocate+0x216/0x8c0 fs/hugetlbfs/inode.c:732
1 lock held by syz.3.27665/6443:
#0: ffffffff83fb5438 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#0: ffffffff83fb5438 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0x179/0x620 kernel/rcu/tree_exp.h:957
1 lock held by syz.8.27667/6441:
#0: ffffffff83fb5438 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#0: ffffffff83fb5438 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0x2df/0x620 kernel/rcu/tree_exp.h:957
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x11f/0x1b0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x227/0x240 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0xea/0x200 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0x864/0x8a0 kernel/hung_task.c:495
kthread+0x2bd/0x300 kernel/kthread.c:463
ret_from_fork+0x172/0x290 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6472 Comm: modprobe Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217
Code: 08 e0 30 85 65 8b 15 08 51 d7 03 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 0c 15 00 00 00 74 2c 8b 91 e8 14 00 00 <83> fa 02 75 21 48 8b 91 f0 14 00 00 48 8b 32 48 8d 7e 01 8b 89 ec
RSP: 0000:ffffc9000282bd20 EFLAGS: 00000246
RAX: ffffffff8166ce1b RBX: 0000000080000001 RCX: ffff888122de3700
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000080000 R09: 0000000000000007
R10: 0000000000000000 R11: ffffffff8166e6d0 R12: ffff888237c24ea8
R13: ffffea0004a60d40 R14: ffff8882b2906000 R15: 0000000000000000
FS: 00007f45f6aa3c80(0000) GS:ffff8882b2906000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f45f6d442f8 CR3: 0000000128564000 CR4: 00000000003506f0
Call Trace:
__folio_batch_add_and_move+0x32b/0x400 mm/swap.c:201
do_anonymous_page mm/memory.c:5230 [inline]
do_pte_missing mm/memory.c:4360 [inline]
handle_pte_fault mm/memory.c:6195 [inline]
__handle_mm_fault mm/memory.c:6336 [inline]
handle_mm_fault+0x240c/0x26e0 mm/memory.c:6505
do_user_addr_fault+0x66f/0x10a0 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f45f6c1d9a6
Code: 8b 90 e8 01 00 00 48 81 e2 00 ff ff ff 7e 14 48 89 d1 48 89 15 8b f8 11 00 48 d1 f9 48 89 0d 89 f8 11 00 48 8b 90 f0 01 00 00 <48> 89 15 4b 69 12 00 48 8b 90 f8 01 00 00 48 89 15 35 69 12 00 48
RSP: 002b:00007ffd5beb3c98 EFLAGS: 00010206
RAX: 00007f45f6e4ca80 RBX: 00007f45f6b92d80 RCX: 0000000001b80000
RDX: 00000000014a0000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd5beb3dc0 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f45f6b75580 R11: 00007f45f6b6c000 R12: 00007f45f6e0e5f0
R13: 00007f45f6b932d8 R14: 00007f45f6d3b488 R15: 00007f45f6b6c000