ci2 starts bisection 2026-07-17 11:46:31.923634123 +0000 UTC m=+31510.297395188 bisecting fixing commit since b9d57c40a767db4d2ef905abb91f73cbe0a791e1 building syzkaller on 9c2d0995bb06e7518555bd3b755e327c89b59823 ensuring issue is reproducible on original commit b9d57c40a767db4d2ef905abb91f73cbe0a791e1 testing commit b9d57c40a767db4d2ef905abb91f73cbe0a791e1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 8bb4f73c7abb063d315b40687435bceb2b4f5bbdc28705718a6c2fd5485fe99a all runs: crashed: possible deadlock in ext4_xattr_get representative crash: possible deadlock in ext4_xattr_get, 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 b9d57c40a767db4d2ef905abb91f73cbe0a791e1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 9dd65c3b285c36a4f894cba64b1640edbad4d783d3c1e85475f0cebaf7cd391b all runs: crashed: possible deadlock in ext4_xattr_get representative crash: possible deadlock in ext4_xattr_get, 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=7425 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 b9d57c40a767db4d2ef905abb91f73cbe0a791e1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 4e0a9f3ed862e916372ad05e8bf182adb4c44eb2a5831aea66cc8eb39e7d04b7 run #0: crashed: possible deadlock in do_writepages run #1: crashed: possible deadlock in ext4_xattr_get run #2: crashed: possible deadlock in ext4_xattr_get run #3: crashed: possible deadlock in ext4_xattr_get run #4: crashed: possible deadlock in ext4_xattr_get run #5: crashed: possible deadlock in ext4_xattr_get run #6: crashed: possible deadlock in ext4_xattr_get run #7: crashed: possible deadlock in ext4_xattr_get run #8: crashed: possible deadlock in ext4_xattr_get run #9: crashed: possible deadlock in ext4_xattr_get representative crash: possible deadlock in do_writepages, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [kasan atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit b9d57c40a767db4d2ef905abb91f73cbe0a791e1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 01f05810351aa2c4137908f314b07ff02f71ac1231978a08882c4ac2a989aeaa run #0: crashed: possible deadlock in do_writepages run #1: crashed: possible deadlock in ext4_xattr_get run #2: crashed: possible deadlock in ext4_xattr_get run #3: crashed: possible deadlock in ext4_xattr_get run #4: crashed: possible deadlock in ext4_xattr_get run #5: crashed: possible deadlock in ext4_xattr_get run #6: crashed: possible deadlock in ext4_xattr_get run #7: crashed: possible deadlock in ext4_xattr_get run #8: crashed: possible deadlock in ext4_xattr_get run #9: crashed: possible deadlock in ext4_xattr_get representative crash: possible deadlock in do_writepages, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed testing commit b9d57c40a767db4d2ef905abb91f73cbe0a791e1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 8617d3dc02079877c558d52fcc69043987e7f3006f8a11c2dc54c847c0c32161 all runs: OK false negative chance: 0.000 testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed testing commit b9d57c40a767db4d2ef905abb91f73cbe0a791e1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: fac9ddf03be60b5a766fe419f294bd70d82a28ff349c41a52934e62716ab4522 run #0: crashed: possible deadlock in do_writepages run #1: crashed: possible deadlock in do_writepages run #2: crashed: possible deadlock in ext4_xattr_get run #3: crashed: possible deadlock in ext4_xattr_get run #4: crashed: possible deadlock in do_writepages run #5: crashed: possible deadlock in ext4_xattr_get run #6: crashed: possible deadlock in ext4_xattr_get run #7: crashed: possible deadlock in ext4_xattr_get run #8: crashed: possible deadlock in ext4_xattr_get run #9: crashed: possible deadlock in ext4_xattr_get representative crash: possible deadlock in do_writepages, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed testing commit b9d57c40a767db4d2ef905abb91f73cbe0a791e1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 771eee606edb4230b6ad38c369df701f9e42c19c6d3908c6b2b25ec59537360d run #0: crashed: possible deadlock in ext4_xattr_get run #1: crashed: possible deadlock in ext4_xattr_get run #2: crashed: possible deadlock in ext4_xattr_get run #3: crashed: possible deadlock in ext4_xattr_get run #4: crashed: possible deadlock in ext4_xattr_get run #5: crashed: possible deadlock in ext4_xattr_get run #6: crashed: possible deadlock in ext4_xattr_get run #7: crashed: possible deadlock in ext4_xattr_get run #8: crashed: possible deadlock in jbd2_journal_lock_updates run #9: OK representative crash: possible deadlock in ext4_xattr_get, 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 MITIGATION_VMSCAPE 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_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 [atomic_sleep hang memleak ubsan bug_or_warning kasan], 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 run #0: crashed: possible deadlock in do_writepages run #1: crashed: possible deadlock in ext4_xattr_get run #2: crashed: possible deadlock in ext4_xattr_get run #3: crashed: possible deadlock in ext4_xattr_get run #4: crashed: possible deadlock in jbd2_journal_lock_updates run #5: crashed: possible deadlock in ext4_xattr_get run #6: crashed: possible deadlock in ext4_xattr_get run #7: OK run #8: OK run #9: OK representative crash: possible deadlock in do_writepages, types: [LOCKDEP] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 2h18m44.875406134s (build: 34m33.462556358s, test: 1h26m47.456914365s) crash still not fixed or there were kernel test errors commit msg: Linux 5.15.211 crash: possible deadlock in do_writepages loop2: detected capacity change from 0 to 512 EXT4-fs (loop2): Warning: mounting with an experimental mount option 'dioread_nolock' for blocksize < PAGE_SIZE ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.17/4436 is trying to acquire lock: ffff88811aa42c50 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x181/0x290 mm/page-writeback.c:2386 but task is already holding lock: ffff888114464b88 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] ffff888114464b88 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5964 [inline] ffff888114464b88 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x240/0x370 fs/ext4/inode.c:6045 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->xattr_sem){++++}-{3:3}: down_read+0x23/0xd0 kernel/locking/rwsem.c:1498 ext4_setattr+0x23b/0xfc0 fs/ext4/inode.c:5476 notify_change+0x6ef/0x9e0 fs/attr.c:505 chown_common+0x364/0x380 fs/open.c:680 do_fchownat+0xe0/0x180 fs/open.c:711 __do_sys_chown fs/open.c:731 [inline] __se_sys_chown fs/open.c:729 [inline] __x64_sys_chown+0x22/0x30 fs/open.c:729 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (jbd2_handle){++++}-{0:0}: wait_transaction_locked+0xc4/0x120 fs/jbd2/transaction.c:178 add_transaction_credits+0x168/0x490 fs/jbd2/transaction.c:242 start_this_handle+0x1c1/0x700 fs/jbd2/transaction.c:423 jbd2__journal_start+0x132/0x2b0 fs/jbd2/transaction.c:521 __ext4_journal_start_sb+0x1d1/0x1f0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_writepages+0x939/0x1bb0 fs/ext4/inode.c:2814 do_writepages+0x181/0x290 mm/page-writeback.c:2386 __writeback_single_inode+0x73/0x580 fs/fs-writeback.c:1657 writeback_sb_inodes+0x2fb/0x810 fs/fs-writeback.c:1940 __writeback_inodes_wb+0x5b/0x150 fs/fs-writeback.c:2011 wb_writeback+0x42a/0x4c0 fs/fs-writeback.c:2116 wb_check_old_data_flush fs/fs-writeback.c:2216 [inline] wb_do_writeback fs/fs-writeback.c:2269 [inline] wb_workfn+0x441/0x740 fs/fs-writeback.c:2298 process_one_work+0x32a/0x680 kernel/workqueue.c:2310 worker_thread+0x5b/0x520 kernel/workqueue.c:2457 kthread+0x148/0x170 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #0 (&sbi->s_writepages_rwsem){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x10b6/0x1a40 kernel/locking/lockdep.c:5012 lock_acquire kernel/locking/lockdep.c:5623 [inline] lock_acquire+0xbb/0x290 kernel/locking/lockdep.c:5588 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] ext4_writepages+0xa0/0x1bb0 fs/ext4/inode.c:2691 do_writepages+0x181/0x290 mm/page-writeback.c:2386 __writeback_single_inode+0x73/0x580 fs/fs-writeback.c:1657 writeback_single_inode+0x126/0x2f0 fs/fs-writeback.c:1770 write_inode_now+0xc4/0x110 fs/fs-writeback.c:2817 iput_final fs/inode.c:1756 [inline] iput.part.0+0x1d1/0x2f0 fs/inode.c:1795 iput+0x3a/0x50 fs/inode.c:1785 ext4_xattr_set_entry+0x522/0x1a80 fs/ext4/xattr.c:1827 ext4_xattr_block_set+0x626/0x16d0 fs/ext4/xattr.c:1995 ext4_xattr_move_to_block fs/ext4/xattr.c:2620 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2695 [inline] ext4_expand_extra_isize_ea+0x880/0xdb0 fs/ext4/xattr.c:2783 __ext4_expand_extra_isize+0x18b/0x200 fs/ext4/inode.c:5924 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5967 [inline] __ext4_mark_inode_dirty+0x28c/0x370 fs/ext4/inode.c:6045 ext4_evict_inode+0x4ef/0xd80 fs/ext4/inode.c:284 evict+0x177/0x390 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput.part.0+0x243/0x2f0 fs/inode.c:1795 iput+0x3a/0x50 fs/inode.c:1785 ext4_orphan_cleanup+0x29f/0x780 fs/ext4/orphan.c:472 ext4_fill_super+0x3e34/0x59a0 fs/ext4/super.c:5006 mount_bdev+0x22a/0x270 fs/super.c:1400 legacy_get_tree+0x34/0xa0 fs/fs_context.c:611 vfs_get_tree+0x28/0xb0 fs/super.c:1530 do_new_mount fs/namespace.c:3034 [inline] path_mount+0xcca/0x1280 fs/namespace.c:3364 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount fs/namespace.c:3562 [inline] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &sbi->s_writepages_rwsem --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.2.17/4436: #0: ffff88811aa410e0 (&type->s_umount_key#25/1){+.+.}-{3:3}, at: alloc_super+0x12e/0x4a0 fs/super.c:229 #1: ffff88811aa41628 (sb_internal){.+.+}-{0:0}, at: evict+0x177/0x390 fs/inode.c:647 #2: ffff888114464b88 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #2: ffff888114464b88 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5964 [inline] #2: ffff888114464b88 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x240/0x370 fs/ext4/inode.c:6045 stack backtrace: CPU: 0 PID: 4436 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 check_noncircular+0xcc/0xe0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x10b6/0x1a40 kernel/locking/lockdep.c:5012 lock_acquire kernel/locking/lockdep.c:5623 [inline] lock_acquire+0xbb/0x290 kernel/locking/lockdep.c:5588 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] ext4_writepages+0xa0/0x1bb0 fs/ext4/inode.c:2691 do_writepages+0x181/0x290 mm/page-writeback.c:2386 __writeback_single_inode+0x73/0x580 fs/fs-writeback.c:1657 writeback_single_inode+0x126/0x2f0 fs/fs-writeback.c:1770 write_inode_now+0xc4/0x110 fs/fs-writeback.c:2817 iput_final fs/inode.c:1756 [inline] iput.part.0+0x1d1/0x2f0 fs/inode.c:1795 iput+0x3a/0x50 fs/inode.c:1785 ext4_xattr_set_entry+0x522/0x1a80 fs/ext4/xattr.c:1827 ext4_xattr_block_set+0x626/0x16d0 fs/ext4/xattr.c:1995 ext4_xattr_move_to_block fs/ext4/xattr.c:2620 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2695 [inline] ext4_expand_extra_isize_ea+0x880/0xdb0 fs/ext4/xattr.c:2783 __ext4_expand_extra_isize+0x18b/0x200 fs/ext4/inode.c:5924 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5967 [inline] __ext4_mark_inode_dirty+0x28c/0x370 fs/ext4/inode.c:6045 ext4_evict_inode+0x4ef/0xd80 fs/ext4/inode.c:284 evict+0x177/0x390 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput.part.0+0x243/0x2f0 fs/inode.c:1795 iput+0x3a/0x50 fs/inode.c:1785 ext4_orphan_cleanup+0x29f/0x780 fs/ext4/orphan.c:472 ext4_fill_super+0x3e34/0x59a0 fs/ext4/super.c:5006 mount_bdev+0x22a/0x270 fs/super.c:1400 legacy_get_tree+0x34/0xa0 fs/fs_context.c:611 vfs_get_tree+0x28/0xb0 fs/super.c:1530 do_new_mount fs/namespace.c:3034 [inline] path_mount+0xcca/0x1280 fs/namespace.c:3364 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount fs/namespace.c:3562 [inline] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f2114d7504a Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2114bd5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2114bd5ee0 RCX: 00007f2114d7504a RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f2114bd5ea0 RBP: 0000200000000180 R08: 00007f2114bd5ee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f2114bd5ea0 R14: 000000000000047a R15: 0000200000000b40 EXT4-fs error (device loop2): ext4_xattr_inode_iget:401: inode #18: comm syz.2.17: iget: bad extra_isize 58 (inode size 256) EXT4-fs error (device loop2): ext4_xattr_inode_iget:404: comm syz.2.17: error while reading EA inode 18 err=-117 EXT4-fs warning (device loop2): ext4_expand_extra_isize_ea:2808: Unable to expand inode 15. Delete some EAs or run e2fsck. EXT4-fs error (device loop2): ext4_xattr_inode_iget:401: inode #11: comm syz.2.17: iget: bad extra_isize 58 (inode size 256) EXT4-fs error (device loop2): ext4_xattr_inode_iget:404: comm syz.2.17: error while reading EA inode 11 err=-117 EXT4-fs (loop2): 1 orphan inode deleted EXT4-fs (loop2): mounted filesystem without journal. Opts: data_err=ignore,dioread_nolock,debug_want_extra_isize=0x000000000000005a,prjquota,max_dir_size_kb=0x0000000000000004,debug_want_extra_isize=0x000000000000003a,min_batch_time=0x0000000000000003,,errors=continue. Quota mode: writeback. syz.2.17 (4436) used greatest stack depth: 10888 bytes left