ci starts bisection 2026-01-13 07:26:03.818115057 +0000 UTC m=+4130753.343601184
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: f212379d11a3a10dcfb38c36efa1edc103a8d64cbe8d4fc4680550e682ebb28d
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: crashed: INFO: task hung in hugetlbfs_zero_partial_page
run #10: crashed: INFO: task hung in hugetlbfs_zero_partial_page
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 rmap_walk_file, 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: d74326026897cc809f793c34e043bb6521ef1cec9c64b89a222298ea14e25ca2
all runs: crashed: INFO: task hung in rmap_walk_file
representative crash: INFO: task hung in rmap_walk_file, types: [HANG]
the bug reproduces without the instrumentation
disabling configs for [locking atomic_sleep memleak ubsan bug_or_warning kasan], 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 [memleak ubsan bug_or_warning kasan locking atomic_sleep], 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: 15af76cd55168743c41d2e74da0890d624935647f2d6afb2c1ff6e0bb6cf2358
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 [memleak ubsan bug_or_warning kasan locking atomic_sleep], 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: b11cc58087fba6a9034dd38134548c368d5186b770469912e7f341432196f44f
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 [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: c97aa52a31a35379420d2e978f489307a3c8039ce947664fcda58f1d94c4142d
all runs: OK
false negative chance: 0.000
testing without sub-chunk 4/5
disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep memleak], 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: 992be59ba2c718ea70e1201bc0dbb7d3f22431c71df7f240bb298e1d129d6937
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: cc1255b1eb39503b79a43d0970a8ef49b4c2eebf8682a10d9a1449a83f414e52
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 [kasan locking atomic_sleep memleak ubsan bug_or_warning], they are not needed
testing current HEAD b71e635feefc852405b14620a7fc58c4c80c0f73
testing commit b71e635feefc852405b14620a7fc58c4c80c0f73 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: cb71edc51354849c8ce70377633b9437ef9535fb988adee493bbe94704f96fd3
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
revisions tested: 8, total time: 3h24m4.350476689s (build: 1h37m25.544497913s, test: 1h13m56.058965756s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'cgroup-for-6.19-rc5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
crash: INFO: task hung in __rmap_walk_file
INFO: task syz.4.118:6248 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.118 state:D stack:13360 pid:6248 tgid:6247 ppid:3831 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x960/0xe60 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xac/0x140 kernel/sched/core.c:6960
schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:7017
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:532 [inline]
__rmap_walk_file+0x13e/0x380 mm/rmap.c:2914
remove_migration_ptes mm/migrate.c:472 [inline]
unmap_and_move_huge_page mm/migrate.c:1528 [inline]
migrate_hugetlbs mm/migrate.c:1649 [inline]
migrate_pages+0x6e7/0x1450 mm/migrate.c:2088
do_mbind mm/mempolicy.c:1609 [inline]
kernel_mbind mm/mempolicy.c:1752 [inline]
__do_sys_mbind mm/mempolicy.c:1826 [inline]
__se_sys_mbind+0x8bb/0xa50 mm/mempolicy.c:1822
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x85/0x2e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8c782ccda9
RSP: 002b:00007f8c77d3f038 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007f8c784e5fa0 RCX: 00007f8c782ccda9
RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000000020001000
RBP: 00007f8c7834e2a0 R08: 0000000000000040 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8c784e5fa0 R15: 00007ffce6e7f5a8
INFO: task syz.4.118:6268 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.118 state:D stack:13832 pid:6268 tgid:6247 ppid:3831 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x960/0xe60 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xac/0x140 kernel/sched/core.c:6960
io_schedule+0x3f/0x60 kernel/sched/core.c:7789
folio_wait_bit_common+0x36b/0x650 mm/filemap.c:1323
__folio_lock mm/filemap.c:1699 [inline]
folio_lock include/linux/pagemap.h:1159 [inline]
__filemap_get_folio_mpol+0x130/0x7f0 mm/filemap.c:1954
__filemap_get_folio include/linux/pagemap.h:763 [inline]
filemap_lock_folio include/linux/pagemap.h:825 [inline]
filemap_lock_hugetlb_folio include/linux/hugetlb.h:817 [inline]
hugetlbfs_zero_partial_page+0x45/0x210 fs/hugetlbfs/inode.c:664
hugetlbfs_punch_hole fs/hugetlbfs/inode.c:718 [inline]
hugetlbfs_fallocate+0x637/0x8c0 fs/hugetlbfs/inode.c:751
vfs_fallocate+0x34c/0x390 fs/open.c:339
madvise_remove mm/madvise.c:1046 [inline]
madvise_vma_behavior+0x539/0x1c70 mm/madvise.c:1360
madvise_walk_vmas mm/madvise.c:1721 [inline]
madvise_do_behavior+0x49f/0x7e0 mm/madvise.c:1937
do_madvise+0x1e5/0x270 mm/madvise.c:2030
__do_sys_madvise mm/madvise.c:2039 [inline]
__se_sys_madvise mm/madvise.c:2037 [inline]
__x64_sys_madvise+0x2d/0x40 mm/madvise.c:2037
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x85/0x2e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8c782ccda9
RSP: 002b:00007f8c77d1e038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f8c784e6080 RCX: 00007f8c782ccda9
RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000000020000000
RBP: 00007f8c7834e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f8c784e6080 R15: 00007ffce6e7f5a8
Showing all locks held in the system:
2 locks held by kworker/u8:0/12:
#0: ffff88810007c948 ((wq_completion)events_unbound){....}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline]
#0: ffff88810007c948 ((wq_completion)events_unbound){....}-{0:0}, at: process_scheduled_works+0x34c/0x8c0 kernel/workqueue.c:3340
#1: ffffc9000006be28 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
#1: ffffc9000006be28 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_scheduled_works+0x373/0x8c0 kernel/workqueue.c:3340
1 lock held by khungtaskd/31:
#0: ffffffff83fb4000 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff83fb4000 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff83fb4000 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6775
2 locks held by getty/1936:
#0: ffff8881092a50a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x50 drivers/tty/tty_ldisc.c:243
#1: ffffc900030572f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x24c/0xba0 drivers/tty/n_tty.c:2211
1 lock held by syz.4.118/6248:
#0: ffff8881032d1a90 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: i_mmap_lock_read include/linux/fs.h:532 [inline]
#0: ffff8881032d1a90 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: __rmap_walk_file+0x13e/0x380 mm/rmap.c:2914
3 locks held by syz.4.118/6268:
#0: ffff8881032843f8 (sb_writers#12){....}-{0:0}, at: vfs_fallocate+0x330/0x390 fs/open.c:338
#1: ffff8881032d17c8 (&sb->s_type->i_mutex_key#18){....}-{3:3}, at: inode_lock include/linux/fs.h:1027 [inline]
#1: ffff8881032d17c8 (&sb->s_type->i_mutex_key#18){....}-{3:3}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:693 [inline]
#1: ffff8881032d17c8 (&sb->s_type->i_mutex_key#18){....}-{3:3}, at: hugetlbfs_fallocate+0x172/0x8c0 fs/hugetlbfs/inode.c:751
#2: ffff8881032d1a90 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: i_mmap_lock_write include/linux/fs.h:512 [inline]
#2: ffff8881032d1a90 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:701 [inline]
#2: ffff8881032d1a90 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: hugetlbfs_fallocate+0x216/0x8c0 fs/hugetlbfs/inode.c:751
1 lock held by syz.0.29191/9279:
#0: ffffffff83fb4fb8 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#0: ffffffff83fb4fb8 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0x2d2/0x610 kernel/rcu/tree_exp.h:956
1 lock held by syz.6.29194/9286:
#0: ffffffff83fb4fb8 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#0: ffffffff83fb4fb8 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0x179/0x610 kernel/rcu/tree_exp.h:956
=============================================
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+0xc8/0x130 lib/dump_stack.c:120
nmi_cpu_backtrace+0x1c3/0x1e0 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]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x129/0x160 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0x8b9/0x900 kernel/hung_task.c:515
kthread+0x2bd/0x300 kernel/kthread.c:463
ret_from_fork+0x1a6/0x380 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9306 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:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x18/0x70 kernel/kcov.c:217
Code: cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 60 33 85 65 8b 15 a8 38 d9 03 <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 fc 14 00 00
RSP: 0018:ffffc90002a238d0 EFLAGS: 00000246
RAX: ffffffff832311a5 RBX: ffffc90002a23980 RCX: ffff88812ef51bc0
RDX: 0000000080000000 RSI: ffffffff8422df50 RDI: 0000000000000001
RBP: 000000000000000e R08: ffff88812ef51bc0 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88812db92100
R13: 0000000000000001 R14: 0000000000000003 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8882b28de000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f37e6df7000 CR3: 000000012ecec000 CR4: 00000000003506f0
Call Trace:
ma_slots lib/maple_tree.c:708 [inline]
mas_next_slot+0x375/0x4b0 lib/maple_tree.c:4405
mas_find+0x428/0x4e0 lib/maple_tree.c:5622
vma_next include/linux/mm.h:1118 [inline]
validate_mm+0xae/0x2c0 mm/vma.c:645
mmap_region+0xd40/0x11e0 mm/vma.c:2792
do_mmap+0x888/0xa70 mm/mmap.c:558
vm_mmap_pgoff+0x130/0x250 mm/util.c:581
ksys_mmap_pgoff+0x226/0x2d0 mm/mmap.c:604
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x85/0x2e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f37e7120242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffd1176b828 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f37e6df4000 RCX: 00007f37e7120242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f37e6df4000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000006000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffd1176b8e8
R13: 00007f37e6df70c0 R14: 00007ffd1176bc60 R15: 00000fffa22ed708