ci2 starts bisection 2026-07-19 02:40:51.256004095 +0000 UTC m=+83030.681770004 bisecting fixing commit since 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c building syzkaller on d291dd2d58a1885c00a60561048b6ceb1bf1206a ensuring issue is reproducible on original commit 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c testing commit 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 2a65e90d882a0c2c50d5474efd48f9ed7124ed8d200d9e4b77860b515e33d28c all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: b7b93ce42768427d255168b7116a7b4c0e866d8d196d4ccfdd2df4e429c50be2 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed kconfig minimization: base=3707 full=7423 leaves diff=2099 split chunks (needed=false): <2099> split chunk #0 of len 2099 into 5 parts testing without sub-chunk 1/5 disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed testing commit 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 2be8a0b08e3ef80fda32d0770fc09c157fb0ea5e77b46e64c27d86d73ede4cea all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: b0b726ca42604e9c15a7aeee030740bb5861519ea7fba9c95240a8a31d5824ac all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed testing commit 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: ce8cc39220dcf951be518c15e7b08591e883b9d0a889e983d69a11b8a0003ba7 all runs: OK false negative chance: 0.000 testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 3b8d38ab0fa860807264462749705c24d8753a276a7ec6df993c2ad4847ce15a all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [bug_or_warning kasan atomic_sleep hang memleak ubsan], they are not needed testing commit 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 7807284d29081526e9a2f872f5bbd67924de413cf3293e0a72baab98229ae878 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] the chunk can be dropped minimized to 420 configs; suspects: [AX25 BRIDGE BRIDGE_NETFILTER CAN CFG80211 CHECKPOINT_RESTORE DVB_CORE FB FSCACHE HAMRADIO HSR INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_USER_ACCESS INPUT_JOYSTICK INPUT_MOUSE IP6_NF_RAW IPV6_MULTIPLE_TABLES IP_NF_RAW IP_SET 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_POLL IR_IGORPLUGUSB IR_IGUANA IR_IMON IR_IMON_RAW IR_MCEUSB IR_REDRAT3 IR_STREAMZAP IR_TOY IR_TTUSBIR ISA_BUS 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_INTEL KVM_MMIO 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 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 MEDIA_TUNER_XC2028 MEDIA_TUNER_XC5000 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 MITIGATION_TSA 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_BLK ND_BTT ND_CLAIM ND_PFN NETDEVSIM NETFILTER_ADVANCED NETFILTER_FAMILY_ARP NETFILTER_FAMILY_BRIDGE NETFILTER_NETLINK_ACCT NETFILTER_NETLINK_GLUE_CT NETFILTER_NETLINK_OSF NETFILTER_NETLINK_QUEUE NETFILTER_SYNPROXY 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 NETFS_SUPPORT 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_CGROUP 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_EGRESS 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_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_COUNTER 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_OBJREF 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_PPTP NF_CONNTRACK_SANE 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_FLOW_TABLE_IPV4 NF_FLOW_TABLE_IPV6 NF_NAT_AMANDA NF_NAT_H323 NF_NAT_PPTP NF_NAT_REDIRECT 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 VIDEO_V4L2 WAN WATCH_QUEUE WIRELESS WLAN WWAN X25] disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed testing current HEAD c86c4726e7f044ab73b493c6f00527aafef640cd testing commit c86c4726e7f044ab73b493c6f00527aafef640cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 0096a6e1a71beedd21ec8b8f2ef405cf96f5cdcae7359a64438a5c8f3eaa9a45 all runs: OK false negative chance: 0.000 # git bisect start c86c4726e7f044ab73b493c6f00527aafef640cd 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c Bisecting: 2058 revisions left to test after this (roughly 11 steps) [ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4] EFI/CPER: don't go past the ARM processor CPER record buffer determine whether the revision contains the guilty commit revision 7a6c2d093c4599727874a7e5e9b27fb313d2bd9c crashed and is reachable testing commit ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 9f5051bc6d594db40a8d280cca365684ddf09dc947f1806e3c496e9daa6d9bc8 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4 Bisecting: 1029 revisions left to test after this (roughly 10 steps) [5acde350889b7d9445b25ac224695961b364b794] KVM: nSVM: Add missing consistency check for nCR3 validity determine whether the revision contains the guilty commit revision ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4 crashed and is reachable testing commit 5acde350889b7d9445b25ac224695961b364b794 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 55be49d7c07d3c5b9a8b3bc5d98bd6501a43f8c79240779ada54bef62230c218 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good 5acde350889b7d9445b25ac224695961b364b794 Bisecting: 514 revisions left to test after this (roughly 9 steps) [01e42aabaf7632beb4bf235c7238b96c746d4144] RDMA/rtrs: Fix use-after-free in path file creation cleanup determine whether the revision contains the guilty commit revision 5acde350889b7d9445b25ac224695961b364b794 crashed and is reachable testing commit 01e42aabaf7632beb4bf235c7238b96c746d4144 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 44e6707876e0eb59aea2031bd0f45af5b925a4e891b435ec1230bab0d47da717 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good 01e42aabaf7632beb4bf235c7238b96c746d4144 Bisecting: 257 revisions left to test after this (roughly 8 steps) [ff44ec94d4fc8348600a69de0a8fa1102c23bce8] net/tcp-md5: Fix MAC comparison to be constant-time determine whether the revision contains the guilty commit revision 01e42aabaf7632beb4bf235c7238b96c746d4144 crashed and is reachable testing commit ff44ec94d4fc8348600a69de0a8fa1102c23bce8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 82972d744b6d539d64b8c0a2d20cc5a1ee0c928db28ffc899d11e184effe7b5e all runs: OK false negative chance: 0.000 # git bisect bad ff44ec94d4fc8348600a69de0a8fa1102c23bce8 Bisecting: 128 revisions left to test after this (roughly 7 steps) [8b93ee5baeef6efabee2c3381907733ad2dbc883] USB: serial: mct_u232: fix missing interrupt-in transfer sanity check determine whether the revision contains the guilty commit revision 01e42aabaf7632beb4bf235c7238b96c746d4144 crashed and is reachable testing commit 8b93ee5baeef6efabee2c3381907733ad2dbc883 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 08ed32535b4f0b79eb8db84f5b62d4d7b6033826c7e1630a207bcf5c3d3a0323 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good 8b93ee5baeef6efabee2c3381907733ad2dbc883 Bisecting: 64 revisions left to test after this (roughly 6 steps) [03bfa95e452e2b6ccd76a332060ae4feaf5ad84d] net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove determine whether the revision contains the guilty commit revision 5acde350889b7d9445b25ac224695961b364b794 crashed and is reachable testing commit 03bfa95e452e2b6ccd76a332060ae4feaf5ad84d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 63c376025b8da6e1af5abd8fd54e6b388f509feeb113232c73ab186ac1479aae all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good 03bfa95e452e2b6ccd76a332060ae4feaf5ad84d Bisecting: 32 revisions left to test after this (roughly 5 steps) [cf7090e255d74c4b61c51f8ede9fcacdd8393b5b] vsock/vmci: fix sk_ack_backlog leak on failed handshake determine whether the revision contains the guilty commit revision 8b93ee5baeef6efabee2c3381907733ad2dbc883 crashed and is reachable testing commit cf7090e255d74c4b61c51f8ede9fcacdd8393b5b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: a8f563dd35caac44b3dbfb6ebeff1418d5ab58d8cc8e0917714d185789c6dfa9 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good cf7090e255d74c4b61c51f8ede9fcacdd8393b5b Bisecting: 16 revisions left to test after this (roughly 4 steps) [460cd4ac8875897e231bf28381369bf0918f1770] mmc: core: Fix host controller programming for fixed driver type determine whether the revision contains the guilty commit revision 03bfa95e452e2b6ccd76a332060ae4feaf5ad84d crashed and is reachable testing commit 460cd4ac8875897e231bf28381369bf0918f1770 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 590849cdc9f2c5c6d2efbda5ab95ee064c28c66300e129deb08a596e851eddb0 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good 460cd4ac8875897e231bf28381369bf0918f1770 Bisecting: 8 revisions left to test after this (roughly 3 steps) [7720654b4842bcdfeb64bc002f6186041849e1e7] thunderbolt: Limit XDomain response copy to actual frame size determine whether the revision contains the guilty commit revision cf7090e255d74c4b61c51f8ede9fcacdd8393b5b crashed and is reachable testing commit 7720654b4842bcdfeb64bc002f6186041849e1e7 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 590849cdc9f2c5c6d2efbda5ab95ee064c28c66300e129deb08a596e851eddb0 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good 7720654b4842bcdfeb64bc002f6186041849e1e7 Bisecting: 4 revisions left to test after this (roughly 2 steps) [b781f90a9528555c709e59789550893581ef0be4] drm/amd/display: Fix NULL deref and buffer over-read in SDP debugfs determine whether the revision contains the guilty commit revision 7720654b4842bcdfeb64bc002f6186041849e1e7 crashed and is reachable testing commit b781f90a9528555c709e59789550893581ef0be4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 590849cdc9f2c5c6d2efbda5ab95ee064c28c66300e129deb08a596e851eddb0 run #0: crashed: possible deadlock in input_event run #1: crashed: possible deadlock in input_event run #2: crashed: possible deadlock in input_event run #3: crashed: possible deadlock in input_event run #4: crashed: possible deadlock in input_event run #5: crashed: possible deadlock in input_event run #6: crashed: possible deadlock in input_event run #7: crashed: possible deadlock in input_event run #8: crashed: possible deadlock in input_event run #9: boot failed: can't ssh into the instance representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good b781f90a9528555c709e59789550893581ef0be4 Bisecting: 2 revisions left to test after this (roughly 1 step) [897d6a7247739fb1528f98c575df4f2e5de7f994] fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling determine whether the revision contains the guilty commit revision 8b93ee5baeef6efabee2c3381907733ad2dbc883 crashed and is reachable testing commit 897d6a7247739fb1528f98c575df4f2e5de7f994 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 6b7dbf7e92580d71d316b1f7786bae7145bbb1f9071c4aac3c12782e89637912 all runs: OK false negative chance: 0.000 # git bisect bad 897d6a7247739fb1528f98c575df4f2e5de7f994 Bisecting: 0 revisions left to test after this (roughly 0 steps) [31180638a33acad12c863132704a76536fb66211] drm/amd/display: Use krealloc_array() in dal_vector_reserve() determine whether the revision contains the guilty commit revision 7720654b4842bcdfeb64bc002f6186041849e1e7 crashed and is reachable testing commit 31180638a33acad12c863132704a76536fb66211 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 590849cdc9f2c5c6d2efbda5ab95ee064c28c66300e129deb08a596e851eddb0 all runs: crashed: possible deadlock in input_event representative crash: possible deadlock in input_event, types: [LOCKDEP] # git bisect good 31180638a33acad12c863132704a76536fb66211 897d6a7247739fb1528f98c575df4f2e5de7f994 is the first bad commit commit 897d6a7247739fb1528f98c575df4f2e5de7f994 Author: Mingyu Wang <25181214217@stu.xidian.edu.cn> Date: Sat May 23 21:52:10 2026 +0800 fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling commit 00633c4683828acd5256fa8d5163f440d74bbe71 upstream. A SOFTIRQ-safe to SOFTIRQ-unsafe lock order deadlock can occur in send_sigio() and send_sigurg() when a process group receives a signal. When FASYNC is configured for a process group (PIDTYPE_PGID), both functions use read_lock(&tasklist_lock) to traverse the task list. However, they are frequently called from softirq context: - send_sigio() via input_inject_event -> kill_fasync - send_sigurg() via tcp_check_urg -> sk_send_sigurg (NET_RX_SOFTIRQ) The deadlock is caused by the rwlock writer fairness mechanism: 1. CPU 0 (process context) holds read_lock(&tasklist_lock) in do_wait(). 2. CPU 1 (process context) attempts write_lock(&tasklist_lock) in fork() or exit() and spins, which blocks all new readers. 3. CPU 0 is interrupted by a softirq (e.g., TCP URG packet reception). 4. The softirq calls send_sigurg() and attempts to acquire read_lock(&tasklist_lock), deadlocking because CPU 1 is waiting. Since PID hashing and do_each_pid_task() traversals are already RCU-protected, the read_lock on tasklist_lock is no longer strictly required for safe traversal. Fix this by replacing tasklist_lock with rcu_read_lock(), aligning the process group signaling path with the single-PID path. This also mitigates a potential remote denial of service vector via TCP URG packets. Lockdep splat: ===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected [...] Chain exists of: &dev->event_lock --> &f_owner->lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&dev->event_lock); lock(&f_owner->lock); lock(&dev->event_lock); *** DEADLOCK *** Reviewed-by: Jeff Layton Signed-off-by: Mingyu Wang <25181214217@stu.xidian.edu.cn> Link: https://patch.msgid.link/20260523135210.590928-1-w15303746062@163.com Signed-off-by: Christian Brauner (Amutable) Signed-off-by: Greg Kroah-Hartman fs/fcntl.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) accumulated error probability: 0.00 culprit signature: 6b7dbf7e92580d71d316b1f7786bae7145bbb1f9071c4aac3c12782e89637912 parent signature: 590849cdc9f2c5c6d2efbda5ab95ee064c28c66300e129deb08a596e851eddb0 revisions tested: 20, total time: 4h31m0.513269229s (build: 1h20m57.341929489s, test: 2h38m58.724594481s) first good commit: 897d6a7247739fb1528f98c575df4f2e5de7f994 fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling recipients (to): ["25181214217@stu.xidian.edu.cn" "brauner@kernel.org" "gregkh@linuxfoundation.org" "jlayton@kernel.org"] recipients (cc): []