ci starts bisection 2025-10-09 04:45:39.597846929 +0000 UTC m=+107318.014410229
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: 778caadb431107e616d02b838c745f867473ba10b5db84362f264374ae87a510
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 rmap_walk_file
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 hugetlbfs_zero_partial_page
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 [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: b2d1d233c4a5ce087782914822b8655d84e3800f4a24763d99f601bd71424046
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 [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
kconfig minimization: base=4115 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 [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: 76244df2088698473f77fdbbab74d808c68a031f1b95fa20bfba3f8cc4693812
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 [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: 186f8b7939cf12ccb9a065bb816b5511c380a14b0cdc4aa825f5f36d39239bfd
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 [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: fe81d1eb52e3a93c54c56c16f9e1772f1bcce8c74cac3b4c3a2f38898cbd4b5d
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 [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: eeafce0a607493bcaf478a685f5650d7558cd3fcfba401fae9a972e0b200edbe
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 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 hugetlbfs_zero_partial_page
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]
the chunk can be dropped
testing without sub-chunk 5/5
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: 49ab5178b9f9b28b2f8694bd2430dc41aed11f5abee850440ae3ff64f0e369d2
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 [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing current HEAD ec714e371f22f716a04e6ecb2a24988c92b26911
testing commit ec714e371f22f716a04e6ecb2a24988c92b26911 gcc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
kernel signature: d4346f9be27696f85ecc1fe53abad87cc81e994b789a22ebe98720c0300d56e0
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: 3h27m56.617868937s (build: 1h32m6.445675728s, test: 1h26m7.281206253s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'perf-tools-for-v6.18-1-2025-10-08' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools
crash: INFO: task hung in __rmap_walk_file
INFO: task syz.3.117:6213 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.117 state:D stack:13496 pid:6213 tgid:6208 ppid:3657 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: 0033:0x7f1850fdcda9
RSP: 002b:00007f1850a4f038 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007f18511f5fa0 RCX: 00007f1850fdcda9
RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000000020001000
RBP: 00007f185105e2a0 R08: 0000000000000040 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f18511f5fa0 R15: 00007fff81909a78
INFO: task syz.3.117:6238 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.117 state:D stack:13816 pid:6238 tgid:6208 ppid:3657 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:654
hugetlbfs_punch_hole fs/hugetlbfs/inode.c:708 [inline]
hugetlbfs_fallocate+0x634/0x8c0 fs/hugetlbfs/inode.c:741
vfs_fallocate+0x349/0x390 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: 0033:0x7f1850fdcda9
RSP: 002b:00007f1850a2e038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f18511f6080 RCX: 00007f1850fdcda9
RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000000020000000
RBP: 00007f185105e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f18511f6080 R15: 00007fff81909a78
Showing all locks held in the system:
2 locks held by kworker/u8:1/14:
#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: ffffc9000007be28 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc9000007be28 ((work_completion)(&sub_info->work)){....}-{0:0}, at: process_scheduled_works+0x373/0x8c0 kernel/workqueue.c:3346
no locks held by kworker/1:0/24.
1 lock held by khungtaskd/31:
#0: ffffffff83fb4350 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff83fb4350 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff83fb4350 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6775
2 locks held by getty/1936:
#0: ffff88810b6c40a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x50 drivers/tty/tty_ldisc.c:243
#1: ffffc9000324f2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x257/0xba0 drivers/tty/n_tty.c:2222
3 locks held by kworker/1:4/4257:
#0: ffff88810006ad48 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff88810006ad48 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x34c/0x8c0 kernel/workqueue.c:3346
#1: ffffc90001e73e28 ((fqdir_free_work).work){....}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc90001e73e28 ((fqdir_free_work).work){....}-{0:0}, at: process_scheduled_works+0x373/0x8c0 kernel/workqueue.c:3346
#2: ffffffff83fb5200 (rcu_state.barrier_mutex){....}-{3:3}, at: rcu_barrier+0x34/0x260 kernel/rcu/tree.c:3820
1 lock held by syz.3.117/6213:
#0: ffff8881012b1610 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: i_mmap_lock_read include/linux/fs.h:568 [inline]
#0: ffff8881012b1610 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: __rmap_walk_file+0x13e/0x380 mm/rmap.c:2905
3 locks held by syz.3.117/6238:
#0: ffff888101a9c3f8 (sb_writers#12){....}-{0:0}, at: vfs_fallocate+0x330/0x390 fs/open.c:341
#1: ffff8881012b1348 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: inode_lock include/linux/fs.h:980 [inline]
#1: ffff8881012b1348 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:683 [inline]
#1: ffff8881012b1348 (&sb->s_type->i_mutex_key#16){....}-{3:3}, at: hugetlbfs_fallocate+0x172/0x8c0 fs/hugetlbfs/inode.c:741
#2: ffff8881012b1610 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: i_mmap_lock_write include/linux/fs.h:548 [inline]
#2: ffff8881012b1610 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:691 [inline]
#2: ffff8881012b1610 (&hugetlbfs_i_mmap_rwsem_key){....}-{3:3}, at: hugetlbfs_fallocate+0x216/0x8c0 fs/hugetlbfs/inode.c:741
1 lock held by syz.7.32344/16794:
#0: ffffffff83fb5338 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#0: ffffffff83fb5338 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0x179/0x620 kernel/rcu/tree_exp.h:957
1 lock held by syz.2.32345/16796:
#0: ffffffff83fb5338 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#0: ffffffff83fb5338 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0x2df/0x620 kernel/rcu/tree_exp.h:957
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:trace_tlb_flush include/trace/events/tlb.h:38 [inline]
RIP: 0010:switch_mm_irqs_off+0x2fe/0x490 arch/x86/mm/tlb.c:932
Code: 96 e8 31 85 f3 0f 1e fa 4c 89 e7 e8 1c f7 ff ff eb 11 cc cc cc f3 0f 1e fa 41 8d 4f 01 0f b7 c9 48 09 c8 f3 0f 1e fa 0f 22 d8 <0f> 1f 44 00 00 65 8b 05 ca f8 f2 03 89 c0 48 0f a3 05 fc 02 ee 02
RSP: 0018:ffffc9000013fbf0 EFLAGS: 00000093
RAX: 000000010006c000 RBX: ffff888100070000 RCX: ffff888101aa0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000003e7a000 R08: 0000000000000000 R09: 000000000000003a
R10: 0000000000000000 R11: ffffffff813720f0 R12: ffff88810006c000
R13: 0000000000000000 R14: ffffffff83ff21c0 R15: 0000000000010000
FS: 0000000000000000(0000) GS:ffff8882b2a0b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07d0dfe4ac CR3: 000000010006c000 CR4: 00000000003506f0
Call Trace:
use_temporary_mm+0xae/0x140 arch/x86/mm/tlb.c:1008
__text_poke+0x2d0/0x4d0 arch/x86/kernel/alternative.c:2488
text_poke arch/x86/kernel/alternative.c:2552 [inline]
smp_text_poke_batch_finish+0x4a3/0x660 arch/x86/kernel/alternative.c:2941
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked kernel/jump_label.c:240 [inline]
static_key_disable+0x64/0x90 kernel/jump_label.c:248
toggle_allocation_gate+0x107/0x150 mm/kfence/core.c:857
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0x3e1/0x8c0 kernel/workqueue.c:3346
worker_thread+0x36d/0x4e0 kernel/workqueue.c:3427
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