syzbot


panic: refcount ADDR wraparound (3)

Status: fixed on 2021/05/23 21:08
Reported-by: syzbot+9b96ea7a5ff8917d3fe4@syzkaller.appspotmail.com
Fix commit: 6f6cd1e8e8aa ktrace: Remove vrele() at the end of ktr_writerequest()
First crash: 624d, last: 623d
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
freebsd panic: refcount ADDR wraparound C 6 1098d 1098d 2/2 fixed on 2020/03/20 00:05
freebsd panic: refcount ADDR wraparound (4) 21 374d 441d 2/2 fixed on 2022/02/09 04:03
freebsd panic: refcount ADDR wraparound (2) 3883 1015d 1016d 0/2 auto-closed as invalid on 2020/06/25 21:25

Sample crash report:
login: panic: refcount 0xfffff800498566ec wraparound
cpuid = 0
time = 1621787435
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0094dfe8a0
vpanic() at vpanic+0x1c7/frame 0xfffffe0094dfe900
panic() at panic+0x43/frame 0xfffffe0094dfe960
_refcount_update_saturated() at _refcount_update_saturated+0x15/frame 0xfffffe0094dfe970
vrele() at vrele+0x7e/frame 0xfffffe0094dfe990
ktr_writerequest() at ktr_writerequest+0x735/frame 0xfffffe0094dfea80
ktr_submitrequest() at ktr_submitrequest+0x5e/frame 0xfffffe0094dfeab0
amd64_syscall() at amd64_syscall+0x5fa/frame 0xfffffe0094dfebf0
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0094dfebf0
--- syscall (1, FreeBSD ELF64, sys_sys_exit), rip = 0x80043e20a, rsp = 0x7fffffffe6d8, rbp = 0x7fffffffec50 ---
KDB: enter: panic
[ thread pid 507 tid 100105 ]
Stopped at      kdb_enter+0x67: movq    $0,0x163736e(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db> show registers
cs                        0x20
ds                        0x3b
es                        0x3b
fs                        0x13
gs                        0x1b
ss                        0x28
rax                       0x12
rcx                       0x80
rdx         0xffffffff819c36cb
rbx                          0
rsp         0xfffffe0094dfe880
rbp         0xfffffe0094dfe8a0
rsi                        0x1
rdi                          0
r8                           0
r9          0x8080808080808080
r10         0xfffffe0094dfe770
r11              0x1ff6bfff59c
r12         0xffffffff82267b90  ddb_dbbe
r13                          0
r14         0xffffffff81a74c1a
r15         0xffffffff81a74c1a
rip         0xffffffff81131a97  kdb_enter+0x67
rflags                    0x82
kdb_enter+0x67: movq    $0,0x163736e(%rip)
db> show proc
Process 507 (syslogd) at 0xfffff80015f5fa60:
 state: NORMAL
 uid: 0  gids: 0
 parent: pid 1 at 0xfffff80004bc7530
 ABI: FreeBSD ELF64
 flag: 0x10100000  flag2: 0
 arguments: /usr/sbin/syslogd -s
 reaper: 0xfffff80004bc7530 reapsubtree: 1
 sigparent: 20
 vmspace: 0xfffffe0094f773e0
   (map 0xfffffe0094f773e0)
   (map.pmap 0xfffffe0094f774a0)
   (pmap 0xfffffe0094f77500)
 threads: 1
100105                   Run     CPU 0                       syslogd
db> ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
  789   787   785     0  S       (threaded)                  syz-executor6395628
100096                   S       nanslp  0xffffffff8273c561  syz-executor6395628
100124                   S       connec  0xfffff8004947e0e0  syz-executor6395628
  787   785   785     0  S       nanslp  0xffffffff8273c560  syz-executor6395628
  785   783   785     0  Ss      pause   0xfffff800493a3b10  csh
  783   694   783     0  Ss      select  0xfffff80015d4d440  sshd
  760     1   760     0  Ss+     ttyin   0xfffff80015465cb0  getty
  759     1   759     0  Ss+     ttyin   0xfffff80015afe4b0  getty
  758     1   758     0  Ss+     ttyin   0xfffff80015afecb0  getty
  757     1   757     0  Ss+     ttyin   0xfffff80015a864b0  getty
  756     1   756     0  Ss+     ttyin   0xfffff80015a86cb0  getty
  755     1   755     0  Ss+     ttyin   0xfffff80015a8a4b0  getty
  754     1   754     0  Ss+     ttyin   0xfffff80015a8acb0  getty
  753     1   753     0  Ss+     ttyin   0xfffff80015a8d4b0  getty
  752     1   752     0  Ss+     ttyin   0xfffff80015a8dcb0  getty
  750     1    24     0  S+      piperd  0xfffff80015dc92e8  logger
  749   748    24     0  S+      nanslp  0xffffffff8273c561  sleep
  748     1    24     0  S+      wait    0xfffff800493a3530  sh
  698     1   698     0  Ss      nanslp  0xffffffff8273c560  cron
  694     1   694     0  Ss      select  0xfffff80015d832c0  sshd
  507     1   507     0  Rs      CPU 0                       syslogd
  436     1   436     0  Ss      select  0xfffff80015d50740  devd
  435     1   435    65  Ss      select  0xfffff80015eb5440  dhclient
  350     1   350     0  Ss      select  0xfffff80015f03d40  dhclient
  347     1   347     0  Ss      select  0xfffff80015d4da40  dhclient
   23     0     0     0  DL      vlruwt  0xfffff80015ca3530  [vnlru]
   22     0     0     0  DL      syncer  0xffffffff8282b9d0  [syncer]
   21     0     0     0  DL      (threaded)                  [bufdaemon]
100081                   D       qsleep  0xffffffff8282aa80  [bufdaemon]
100088                   D       -       0xffffffff8220ae80  [bufspacedaemon-0]
100099                   D       sdflush 0xfffff80004dfc4e8  [/ worker]
   20     0     0     0  DL      psleep  0xffffffff828528c8  [vmdaemon]
   19     0     0     0  DL      (threaded)                  [pagedaemon]
100079                   D       psleep  0xffffffff82846d38  [dom0]
100086                   D       launds  0xffffffff82846d44  [laundry: dom0]
100087                   D       umarcl  0xffffffff815cd2b0  [uma]
   18     0     0     0  DL      -       0xffffffff82570908  [rand_harvestq]
   17     0     0     0  DL      waiting 0xffffffff82f65828  [sctp_iterator]
   16     0     0     0  DL      pftm    0xffffffff82d783c0  [pf purge]
   15     0     0     0  DL      -       0xffffffff828280dc  [soaiod4]
    9     0     0     0  DL      -       0xffffffff828280dc  [soaiod3]
    8     0     0     0  DL      -       0xffffffff828280dc  [soaiod2]
    7     0     0     0  DL      -       0xffffffff828280dc  [soaiod1]
    6     0     0     0  DL      (threaded)                  [cam]
100044                   D       -       0xffffffff82447dc0  [doneq0]
100045                   D       -       0xffffffff82447d40  [async]
100078                   D       -       0xffffffff82447c10  [scanner]
   14     0     0     0  DL      seqstat 0xfffff80004dcbc88  [sequencer 00]
    5     0     0     0  DL      crypto_ 0xfffff80004d99d80  [crypto returns 1]
    4     0     0     0  DL      crypto_ 0xfffff80004d99d30  [crypto returns 0]
    3     0     0     0  DL      crypto_ 0xffffffff82844220  [crypto]
   13     0     0     0  DL      (threaded)                  [geom]
100035                   D       -       0xffffffff8271bda0  [g_event]
100036                   D       -       0xffffffff8271bda8  [g_up]
100037                   D       -       0xffffffff8271bdb0  [g_down]
    2     0     0     0  DL      (threaded)                  [KTLS]
100028                   D       -       0xfffff80004c39d00  [thr_0]
100029                   D       -       0xfffff80004c39d80  [thr_1]
   12     0     0     0  WL      (threaded)                  [intr]
100012                   I                                   [swi5: fast taskq]
100015                   I                                   [swi6: task queue]
100017                   I                                   [swi6: Giant taskq]
100030                   I                                   [swi4: clock (0)]
100031                   I                                   [swi4: clock (1)]
100032                   I                                   [swi1: netisr 0]
100033                   I                                   [swi3: vm]
100046                   I                                   [irq24: virtio_pci0]
100047                   I                                   [irq25: virtio_pci0]
100048                   I                                   [irq26: virtio_pci0]
100049                   I                                   [irq27: virtio_pci0]
100050                   I                                   [irq28: virtio_pci1]
100051                   I                                   [irq29: virtio_pci1]
100052                   I                                   [irq30: virtio_pci1]
100053                   I                                   [irq31: virtio_pci1]
100054                   I                                   [irq32: virtio_pci1]
100059                   I                                   [irq10: virtio_pci2]
100061                   I                                   [irq1: atkbd0]
100062                   I                                   [irq12: psm0]
100063                   I                                   [swi0: uart uart++]
100071                   I                                   [swi1: pf send]
100084                   I                                   [swi1: hpts]
100085                   I                                   [swi1: hpts]
   11     0     0     0  RL      (threaded)                  [idle]
100003                   CanRun                              [idle: cpu0]
100004                   Run     CPU 1                       [idle: cpu1]
    1     0     1     0  SLs     wait    0xfffff80004bc7530  [init]
   10     0     0     0  DL      audit_w 0xffffffff82844730  [audit]
    0     0     0     0  DLs     (threaded)                  [kernel]
100000                   D       swapin  0xffffffff8271c330  [swapper]
100005                   D       -       0xfffff80004c63d00  [if_config_tqg_0]
100006                   D       -       0xfffff80004c63900  [softirq_0]
100007                   D       -       0xfffff80004c63500  [softirq_1]
100008                   D       -       0xfffff80004c63100  [if_io_tqg_0]
100009                   D       -       0xfffff80004c61d00  [if_io_tqg_1]
100010                   D       -       0xfffff80004c5fd00  [in6m_free taskq]
100011                   D       -       0xfffff80004c5f900  [aiod_kick taskq]
100013                   D       -       0xfffff80004c5f100  [kqueue_ctx taskq]
100014                   D       -       0xfffff80004c58d00  [pci_hp taskq]
100016                   D       -       0xfffff80004c58500  [inm_free taskq]
100018                   D       -       0xfffff80004c53d00  [linuxkpi_irq_wq]
100019                   D       -       0xfffff80004c53900  [thread taskq]
100020                   D       -       0xfffff80004c53500  [linuxkpi_short_wq_0]
100021                   D       -       0xfffff80004c53500  [linuxkpi_short_wq_1]
100022                   D       -       0xfffff80004c53500  [linuxkpi_short_wq_2]
100023                   D       -       0xfffff80004c53500  [linuxkpi_short_wq_3]
100024                   D       -       0xfffff80004c53100  [linuxkpi_long_wq_0]
100025                   D       -       0xfffff80004c53100  [linuxkpi_long_wq_1]
100026                   D       -       0xfffff80004c53100  [linuxkpi_long_wq_2]
100027                   D       -       0xfffff80004c53100  [linuxkpi_long_wq_3]
100034                   D       -       0xfffff80004c39900  [firmware taskq]
100038                   D       -       0xfffff80004c39500  [crypto_0]
100039                   D       -       0xfffff80004c39500  [crypto_1]
100055                   D       -       0xfffff800153dc900  [vtnet0 rxq 0]
100056                   D       -       0xfffff800153dc500  [vtnet0 txq 0]
100057                   D       -       0xfffff800153dc100  [vtnet0 rxq 1]
100058                   D       -       0xfffff800153c6d00  [vtnet0 txq 1]
100060                   D       vtbslp  0xfffff80015429500  [virtio_balloon]
100064                   D       -       0xfffff800153c6900  [mca taskq]
100066                   D       -       0xffffffff81e21531  [deadlkres]
100074                   D       -       0xfffff80015a19900  [acpi_task_0]
100075                   D       -       0xfffff80015a19900  [acpi_task_1]
100076                   D       -       0xfffff80015a19900  [acpi_task_2]
100077                   D       -       0xfffff80004c39100  [CAM taskq]
db> show all locks
Process 507 (syslogd) thread 0xfffffe0094f16ac0 (100105)
exclusive sx ktrace_sx (ktrace_sx) r = 0 (0xffffffff8271e7e8) locked @ /syzkaller/managers/main/kernel/sys/kern/kern_ktrace.c:416
db> show malloc
              Type        InUse        MemUse     Requests
         sysctloid        34288        12858K        34355
           pf_hash            5        11560K            5
            devbuf         4216         6982K         4241
          tcp_hpts            5         3219K            5
              kobj          328         2624K          488
             vtbuf           24         2064K           46
            newblk          578         1321K          721
          vfscache            3         1035K            3
            acpica         1674          649K        55230
               pcb           24          613K           79
          inodedep           28          547K           72
           callout            2          528K            2
         ufs_quota            1          520K            1
          vfs_hash            1          520K            1
              intr            4          480K            4
           subproc          105          434K          848
               bus          990          378K         3499
            linker          348          270K          397
            DEVFS1          103          206K          112
            module          512          192K          512
         vnet_data            1          176K            1
           tidhash            3          164K            3
           kdtrace          169          140K          915
           pagedep            8          140K           18
        tfo_ccache            1          136K            1
               sem            4          120K            4
              umtx          264          116K          264
               UMA          270          102K          270
     audit_evclass          236           89K          294
          mtx_pool            2           80K            2
          syncache            1           76K            1
              temp           18           71K         1619
               msg            4           68K            4
               BPF           10           68K           10
          acpitask            1           64K            1
       ddb_capture            1           64K            1
            DEVFS3          122           61K          132
        gtaskqueue           18           57K           18
              vmem            3           56K            4
        DEVFS_RULE           56           54K           56
              kenv           95           52K           95
      eventhandler          133           50K          133
           ithread           99           43K           99
              rman           84           42K          425
            ifaddr           30           40K           32
            KTRACE          101           38K         6141
         taskqueue           60           36K           60
              proc            3           34K            3
         ufs_mount            5           34K            6
            bus-sc           33           34K         1710
          routetbl           50           34K          176
           devstat            4           33K            4
         hostcache            1           32K            1
               tty           16           32K           16
               shm            1           32K            1
              GEOM           60           29K          489
            kbdmux            6           28K            6
              cred           23           23K          244
         CAM queue            5           21K         1528
         pfs_nodes           20           20K           20
            plimit           18           18K          343
            kqueue           47           18K          792
           pwddesc           47           18K          790
              UART           12           18K           12
         bmsafemap            2           17K           41
              ksem            1           16K            1
               rpc            2           16K            2
             shmfd            1           16K            1
       pfs_vncache            1           16K            1
       ether_multi           40           15K           50
         proc-args           39           15K          491
       ufs_dirhash           24           14K           24
            sglist            5           13K            5
               MCA           32           12K           32
           CAM DEV            3           12K          510
                vt           11           11K           11
         in6_multi           25           11K           25
           acpisem           28           11K           28
           CAM XPT           22           11K          543
            Unitno           27           11K           39
           session           20           10K           32
           lltable           11            9K           11
           uidinfo            3            9K            9
             ifnet            3            9K            3
             selfd           22            9K         9139
           memdesc            1            8K            1
         ipsec-saq            2            8K            2
             evdev            4            8K            4
          filedesc            1            8K            1
           acpidev           20            8K           20
             hhook           15            8K           17
             mount           16            7K           90
          pf_ifnet            5            6K            6
       fpukern_ctx            3            6K            3
             lockf           16            6K           26
          terminal           11            6K           11
          freefile           13            5K           22
       ipsecpolicy            2            5K            2
 encap_export_host           12            5K           12
             clone            9            5K            9
       inpcbpolicy           11            5K          140
        local_apic            1            4K            1
           io_apic            1            4K            1
            sahead            1            4K            1
          secasvar            1            4K            1
          pci_link           10            4K           10
               msi            9            4K            9
             DEVFS            9            4K           10
               osd            8            4K           22
             ipsec            3            3K            3
            diradd            8            3K           37
             nhops            6            3K            6
          nexusdev            7            3K            7
            feeder            7            3K            7
            select            7            3K           29
         toponodes            6            3K            6
            prison            6            3K            6
            isadev            6            3K            6
           softdep            1            2K            1
            dirrem            4            2K           28
          indirdep            4            2K            4
       vnodemarker            2            2K           10
      NFSD session            1            2K            1
          sctp_ifa            5            2K            6
             linux            5            2K            6
        CAM periph            4            2K          271
            soname            5            2K         3236
            crypto            4            2K            4
            ip6ndp            4            2K            5
            DEVFSP            4            2K            9
         newdirblk            4            2K            8
             mkdir            4            2K           16
              pfil            4            2K            4
          CAM path            4            2K         1034
          filecaps            4            2K           66
           tcpfunc            3            2K            3
               tun            3            2K            3
        loginclass            3            2K            7
          in_multi            2            1K            4
    chacha20random            1            1K            1
            vnodes            1            1K            1
           CAM SIM            2            1K            2
              ktls            1            1K            1
              cdev            2            1K            2
        aesni_data            2            1K            2
          sctp_ifn            2            1K            6
              cpus            2            1K            2
          atkbddev            2            1K            2
     CAM dev queue            2            1K            2
             xform            2            1K           49
               mld            2            1K            2
              igmp            2            1K            2
           entropy            2            1K           35
      NFSD lckfile            1            1K            1
     NFSD V4client            1            1K            1
          procdesc            1            1K            6
          pmchooks            1            1K            1
          sctp_vrf            1            1K            1
            apmdev            1            1K            1
 CAM I/O Scheduler            1            1K            1
          freework            1            1K           26
    vnet_data_free            1            1K            1
              vnet            1            1K            1
           Per-cpu            1            1K            1
          p1003.1b            1            1K            1
          acpiintr            1            1K            1
               pmc            1            1K            1
        dctcp data            0            0K            0
            tcp_do            0            0K            0
           tcp_fsb            0            0K            0
          chd data            0            0K            0
        sctp_mcore            0            0K            0
        sctp_socko            0            0K            0
         sctp_iter            0            0K            3
         sctp_mvrf            0            0K            0
         sctp_timw            0            0K            0
         sctp_cpal            0            0K            0
         sctp_cmsg            0            0K            0
         sctp_stre            0            0K            0
         sctp_athi            0            0K            0
         sctp_athm            0            0K            0
         sctp_atky            0            0K            0
         sctp_atcl            0            0K            0
         sctp_a_it            0            0K            3
         sctp_aadr            0            0K            0
         sctp_stro            0            0K            0
         sctp_stri            0            0K            0
          sctp_map            0            0K            0
        cubic data            0            0K            0
        vegas data            0            0K            0
            mqdata            0            0K            0
         htcp data            0            0K            0
          cdg data            0            0K            0
          pf_table            0            0K            0
           pf_rule            0            0K            0
           pf_altq            0            0K            0
           pf_osfp            0            0K            0
           pf_temp            0            0K            0
       NFSD V4lock            0            0K            0
        madt_table            0            0K            2
          smartpqi            0            0K            0
      NFSD V4state            0            0K            0
     NFSD srvcache            0            0K            0
       msdosfs_fat            0            0K            0
     msdosfs_mount            0            0K            0
      msdosfs_node            0            0K            0
              iavf            0            0K            0
               ixl            0            0K            0
            DEVFS4            0            0K            0
            DEVFS2            0            0K            0
            gntdev            0            0K            0
       privcmd_dev            0            0K            0
        ice-resmgr            0            0K            0
         ice-osdep            0            0K            0
               ice            0            0K            0
             axgbe            0            0K            0
        evtchn_dev            0            0K            0
          xenstore            0            0K            0
         ciss_data            0            0K            0
         BACKLIGHT            0            0K            0
               xnb            0            0K            0
              xbbd            0            0K            0
               xbd            0            0K            0
           Balloon            0            0K            0
          sysmouse            0            0K            0
            vtfont            0            0K            0
          xen_intr            0            0K            0
           xen_hvm            0            0K            0
         legacydrv            0            0K            0
            qpidrv            0            0K            0
           ath_hal            0            0K            0
            athdev            0            0K            0
      dmar_idpgtbl            0            0K            0
          dmar_dom            0            0K            0
          dmar_ctx            0            0K            0
           ata_pci            0            0K            0
           ata_dma            0            0K            0
       ata_generic            0            0K            0
              isci            0            0K            0
      iommu_dmamap            0            0K            0
               amr            0            0K            0
     hyperv_socket            0            0K            0
           bxe_ilt            0            0K            0
            xenbus            0            0K            0
            pvscsi            0            0K            0
           scsi_da            0            0K           69
     vm_fictitious            0            0K            0
            ata_da            0            0K            0
           scsi_ch            0            0K            0
           scsi_cd            0            0K            0
       AHCI driver            0            0K            0
            USBdev            0            0K            0
               USB            0            0K            0
               agp            0            0K            0
           nvme_da            0            0K            0
           UMAHash            0            0K            0
           acpipwr            0            0K            0
         acpi_perf            0            0K            0
         vm_pgdata            0            0K            0
           jblocks            0            0K            0
          savedino            0            0K           17
          sentinel            0            0K            0
            jfsync            0            0K            0
            jtrunc            0            0K            0
             sbdep            0            0K            3
           jsegdep            0            0K            0
              jseg            0            0K            0
         jfreefrag            0            0K            0
          jfreeblk            0            0K            0
           jnewblk            0            0K            0
            jmvref            0            0K            0
           jremref            0            0K            0
           jaddref            0            0K            0
           freedep            0            0K            0
          freeblks            0            0K           25
          freefrag            0            0K           21
        allocindir            0            0K            0
       allocdirect            0            0K            0
          ufs_trim            0            0K            0
           mactemp            0            0K            0
     audit_trigger            0            0K            0
 audit_pipe_presel            0            0K            0
     audit_pipeent            0            0K            0
        audit_pipe            0            0K            0
      audit_evname            0            0K            0
         audit_bsm            0            0K            0
      audit_gidset            0            0K            0
        audit_text            0            0K            0
        audit_path            0            0K            0
        audit_data            0            0K            0
        audit_cred            0            0K            0
            twsbuf            0            0K            0
        MLX5EEPROM            0            0K            0
        MLX5EEPROM            0            0K            0
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            statfs            0            0K          197
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ag_tgt_map_t malloc            0            0K            0
ag_slr_map_t malloc            0            0K            0
lDevFlags * malloc            0            0K            0
tiDeviceHandle_t * malloc            0            0K            0
ag_portal_data_t malloc            0            0K            0
ag_device_t malloc            0            0K            0
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db> show uma
              Zone   Size    Used    Free    Requests  Sleeps  Bucket  Total Mem    XFree
   mbuf_jumbo_page   4096    8320     745       13412       0     254   37130240        0
        malloc-384    384   34655      45       36560       0      30   13324800        0
       malloc-1024   1024    4143       9        4372       0      16    4251648        0
       malloc-8192   8192     329       1         489       0       1    2703360        0
              pbuf   2624       0     989           0       0       2    2595136        0
              mbuf    256    8577     798       15592       0     254    2400000        0
          BUF TRIE    144     173   13295         451       0      62    1939392        0
       UMA Slabs 0    112   11229       0       11229       0     126    1257648        0
        malloc-384    384    1903      37       78243       0      30     744960        0
         FFS inode   1160     490      28         513       0       8     600880        0
        malloc-384    384    1265      35        3630       0      30     499200        0
       malloc-8192   8192      56       3         799       0       1     483328        0
        malloc-384    384     996      24        3348       0      30     391680        0
            lkpimm    160       1    2324           1       0      62     372000        0
          lkpicurr    160       2    2323           2       0      62     372000        0
        malloc-512    512     639       9         920       0      30     331776        0
        RADIX NODE    144    2155     138       20390       0      62     330192        0
      malloc-65536  65536       4       0           4       0       1     262144        0
         VM OBJECT    264     904      56       12773       0      30     253440        0
             VNODE    448     520      29         545       0      30     245952        0
      malloc-16384  16384      11       4         273       0       1     245760        0
            THREAD   1808     121      11         124       0       8     238656        0
        malloc-384    384     589      21         733       0      30     234240        0
            DEVCTL   1024       0     216         116       0       0     221184        0
       malloc-2048   2048     103       5         112       0       8     221184        0
      malloc-65536  65536       1       2         178       0       1     196608        0
         UMA Zones    768     242       2         242       0      16     187392        0
      malloc-16384  16384      10       1          14       0       1     180224        0
       malloc-1024   1024     156       4         900       0      16     163840        0
       malloc-4096   4096       2      37        1796       0       2     159744        0
        malloc-512    512     249      23         960       0      30     139264        0
        256 Bucket   2048      57      11        9875       0       8     139264        0
         vmem btag     56    2317     119        2317       0     254     136416        0
      malloc-65536  65536       2       0           2       0       1     131072        0
      malloc-32768  32768       3       1         148       0       1     131072        0
       malloc-8192   8192      14       2         134       0       1     131072        0
       FFS2 dinode    256     490      20         512       0      62     130560        0
          ksiginfo    112      39    1005          55       0     126     116928        0
         MAP ENTRY     96     850     326       38198       0     126     112896        0
       malloc-1024   1024      74      34         150       0      16     110592        0
       S VFS Cache    104     970      83        1011       0     126     109512        0
       malloc-1024   1024      99       5         691       0      16     106496        0
      malloc-16384  16384       6       0           6       0       1      98304        0
        malloc-512    512     169       7         195       0      30      90112        0
          UMA Kegs    384     227       6         227       0      30      89472        0
           VMSPACE   2544      24       9         768       0       4      83952        0
              PROC   1328      46      11         789       0       8      75696        0
             g_bio    408       0     170        4628       0      30      69360        0
         filedesc0   1072      47      16         790       0       8      67536        0
      mbuf_cluster   2048      30       2          30       0     254      65536        0
      malloc-65536  65536       1       0           1       0       1      65536        0
      malloc-65536  65536       1       0           1       0       1      65536        0
      malloc-32768  32768       2       0           2       0       1      65536        0
      malloc-32768  32768       2       0           2       0       1      65536        0
        malloc-384    384      89      71        9281       0      30      61440        0
       malloc-1024   1024      53       3          57       0      16      57344        0
        malloc-512    512      73      31         393       0      30      53248        0
      malloc-16384  16384       3       0           3       0       1      49152        0
      malloc-16384  16384       1       2           4       0       1      49152        0
       malloc-8192   8192       4       2         534       0       1      49152        0
       malloc-4096   4096       5       7         515       0       2      49152        0
       malloc-2048   2048       8      16         516       0       8      49152        0
        malloc-384    384      72      48         574       0      30      46080        0
         32 Bucket    256      64     116        9033       0      62      46080        0
       malloc-4096   4096       6       5          74       0       2      45056        0
       malloc-2048   2048       9      13        1189       0       8      45056        0
       malloc-2048   2048      18       4          22       0       8      45056        0
        128 Bucket   1024      22      21         141       0      16      44032        0
            clpbuf   2624       0      16          20       0      16      41984        0
           DIRHASH   1024      34       6          34       0      16      40960        0
             NAMEI   1024       0      36       12038       0      16      36864        0
            pcpu-8      8    4210     398        4238       0     254      36864        0
      malloc-16384  16384       2       0           2       0       1      32768        0
       malloc-4096   4096       6       2          22       0       2      32768        0
       malloc-4096   4096       8       0         199       0       2      32768        0
       malloc-1024   1024      30       2          31       0      16      32768        0
           pcpu-64     64     486      26         486       0     254      32768        0
       malloc-4096   4096       7       0           7       0       2      28672        0
            socket    944      19       9        1257       0     254      26432        0
       malloc-8192   8192       1       2         199       0       1      24576        0
       malloc-8192   8192       3       0           3       0       1      24576        0
       malloc-4096   4096       2       4         268       0       2      24576        0
         64 Bucket    512      40       8        1381       0      30      24576        0
            ttyinq    160     135      15         300       0      62      24000        0
           ttyoutq    256      72      18         160       0      62      23040        0
       malloc-2048   2048       9       1           9       0       8      20480        0
       malloc-2048   2048       9       1           9       0       8      20480        0
       malloc-1024   1024       2      18          22       0      16      20480        0
        malloc-512    512      15      25         104       0      30      20480        0
        malloc-512    512      12      28        1226       0      30      20480        0
          2 Bucket     32      79     551        1182       0     254      20160        0
         TURNSTILE    136     133      14         133       0      62      19992        0
       Mountpoints   2752       2       5           2       0       4      19264        0
              pipe    744       7      18         286       0      16      18600        0
        SLEEPQUEUE     88     133      59         133       0     126      16896        0
      malloc-16384  16384       1       0           1       0       1      16384        0
      malloc-16384  16384       1       0           1       0       1      16384        0
        malloc-512    512      20      12         301       0      30      16384        0
        malloc-384    384      26      14          50       0      30      15360        0
             tcpcb   1064       4      10          10       0     254      14896        0
        malloc-512    512      13      11          20       0      30      12288        0
             Files     80      73      77        6532       0     126      12000        0
         udp_inpcb    488       6      18         126       0     254      11712        0
              kenv    258      15      30        1044       0      30      11610        0
       malloc-2048   2048       0       4           4       0       8       8192        0
       malloc-2048   2048       4       0           4       0       8       8192        0
       malloc-1024   1024       0       8          19       0      16       8192        0
           rtentry    176      13      33          17       0      62       8096        0
              PGRP     88      20      72          32       0     126       8096        0
    ertt_txseginfo     40       0     202         206       0     254       8080        0
          rl_entry     40      32     170          32       0     254       8080        0
        sctp_laddr     48       0     168           4       0     254       8064        0
             udpcb     32       6     246         126       0     254       8064        0
              ertt     72       4     108          10       0     126       8064        0
               PWD     32      10     242         102       0     254       8064        0
         16 Bucket    144      36      20        1308       0      62       8064        0
          4 Bucket     48       6     162          55       0     254       8064        0
      vtnet_tx_hdr     24       0     334        1350       0     254       8016        0
          8 Bucket     80      38      62         346       0     126       8000        0
         tcp_inpcb    488       4      12          10       0     254       7808        0
     routing nhops    256      10      20          17       0      62       7680        0
             unpcb    256       7      23        1100       0     254       7680        0
       mbuf_packet    256       0      30          94       0     254       7680        0
     FPU_save_area    832       1       8           1       0      16       7488        0
            cpuset    104       7      55           7       0     126       6448        0
 epoch_record pcpu    256       4      12           4       0      62       4096        0
           pcpu-16     16       7     249           7       0     254       4096        0
         hostcache     64       1      62           1       0     254       4032        0
          syncache    168       0      24           5       0     254       4032        0
             KNOTE    160       0      25           8       0      62       4000        0
             ripcb    488       1       7           4       0     254       3904        0
       UMA Slabs 1    176       8      14           8       0      62       3872        0
            mqnode    416       3       6           3       0      30       3744        0
        KMAP ENTRY     96      12      27          12       0       0       3744        0
              vmem   1856       1       1           1       0       8       3712        0
           SMR CPU     32       3      60           3       0     254       2016        0
        SMR SHARED     24       3      60           3       0     254       1512        0
       FFS1 dinode    128       0       0           0       0     126          0        0
            da_ccb    544       0       0           0       0      16          0        0
           ada_ccb    272       0       0           0       0      30          0        0
             swblk    136       0       0           0       0      62          0        0
          swpctrie    144       0       0           0       0      62          0        0
   cdg_qdiffsample     16       0       0           0       0     254          0        0
   sctp_asconf_ack     48       0       0           0       0     254          0        0
       sctp_asconf     40       0       0           0       0     254          0        0
sctp_stream_msg_out    112       0       0           0       0     254          0        0
        sctp_readq    152       0       0           0       0     254          0        0
        sctp_chunk    152       0       0           0       0     254          0        0
        sctp_raddr    736       0       0           0       0     254          0        0
         sctp_asoc   2288       0       0           0       0     254          0        0
           sctp_ep   1280       0       0           0       0     254          0        0
   pf state scrubs     40       0       0           0       0     254          0        0
   pf frag entries     40       0       0           0       0     254          0        0
          pf frags    248       0       0           0       0      62          0        0
  pf table entries    160       0       0           0       0      62          0        0
pf table entry counters     64       0       0           0       0     254          0        0
   pf source nodes    136       0       0           0       0     254          0        0
     pf state keys     88       0       0           0       0     126          0        0
         pf states    304       0       0           0       0     254          0        0
           pf tags    104       0       0           0       0     126          0        0
          pf mtags     48       0       0           0       0     254          0        0
       tcp_bbr_pcb    832       0       0           0       0      16          0        0
       tcp_bbr_map    128       0       0           0       0     126          0        0
      tcp_rack_pcb    832       0       0           0       0      16          0        0
      tcp_rack_map    112       0       0           0       0     126          0        0
     udplite_inpcb    488       0       0           0       0     254          0        0
      tcp_log_node    120       0       0           0       0     126          0        0
    tcp_log_bucket    176       0       0           0       0      62          0        0
           tcp_log    416       0       0           0       0     254          0        0
          tcpreass     48       0       0           0       0     254          0        0
tfo_ccache_entries     80       0       0           0       0     126          0        0
               tfo      4       0       0           0       0     254          0        0
          sackhole     32       0       0           0       0     254          0        0
             tcptw     88       0       0           0       0     254          0        0
               ipq     56       0       0           0       0     254          0        0
    IPsec SA lft_c     16       0       0           0       0     254          0        0
            itimer    352       0       0           0       0      30          0        0
            AIOLIO    272       0       0           0       0      30          0        0
             AIOCB    552       0       0           0       0      16          0        0
              AIOP     32       0       0           0       0     254          0        0
               AIO    208       0       0           0       0      62          0        0
        TMPFS node    224       0       0           0       0      62          0        0
           NCLNODE    584       0       0           0       0      16          0        0
        mqnotifier    216       0       0           0       0      62          0        0
            mvdata     64       0       0           0       0     254          0        0
            mqueue    248       0       0           0       0      62          0        0
     LTS VFS Cache    360       0       0           0       0      30          0        0
       L VFS Cache    320       0       0           0       0      30          0        0
     STS VFS Cache    144       0       0           0       0      62          0        0
           cryptop    280       0       0           0       0      30          0        0
  linux_dma_object     24       0       0           0       0     254          0        0
  linux_dma_pctrie    144       0       0           0       0      62          0        0
   IOMMU_MAP_ENTRY    120       0       0           0       0     126          0        0
      ktls_session    192       0       0           0       0      62          0        0
    mbuf_jumbo_16k  16384       0       0           0       0     254          0        0
     mbuf_jumbo_9k   9216       0       0           0       0     254          0        0
      audit_record   1280       0       0           0       0       8          0        0
         domainset     40       0       0           0       0     254          0        0
        MAC labels     40       0       0           0       0     254          0        0
            vnpbuf   2624       0       0           0       0      64          0        0
            mdpbuf   2624       0       0           0       0       3          0        0
           nfspbuf   2624       0       0           0       0      16          0        0
            swwbuf   2624       0       0           0       0       8          0        0
            swrbuf   2624       0       0           0       0      16          0        0
          umtx_shm     88       0       0           0       0     126          0        0
           umtx pi     96       0       0           0       0     126          0        0
rangeset pctrie nodes    144       0       0           0       0      62          0        0
      malloc-65536  65536       0       0           0       0       1          0        0
      malloc-65536  65536       0       0           0       0       1          0        0
      malloc-65536  65536       0       0           0       0       1          0        0
      malloc-32768  32768       0       0           0       0       1          0        0
      malloc-32768  32768       0       0           0       0       1          0        0
      malloc-32768  32768       0       0           0       0       1          0        0
      malloc-32768  32768       0       0           0       0       1          0        0
      malloc-32768  32768       0       0           0       0       1          0        0
       malloc-8192   8192       0       0           0       0       1          0        0
       malloc-8192   8192       0       0           0       0       1          0        0
       malloc-4096   4096       0       0           0       0       2          0        0
        malloc-256    256       0       0           0       0      62          0        0
        malloc-256    256       0       0           0       0      62          0        0
        malloc-256    256       0       0           0       0      62          0        0
        malloc-256    256       0       0           0       0      62          0        0
        malloc-256    256       0       0           0       0      62          0        0
        malloc-256    256       0       0           0       0      62          0        0
        malloc-256    256       0       0           0       0      62          0        0
        malloc-256    256       0       0           0       0      62          0        0
        malloc-128    128       0       0           0       0     126          0        0
        malloc-128    128       0       0           0       0     126          0        0
        malloc-128    128       0       0           0       0     126          0        0
        malloc-128    128       0       0           0       0     126          0        0
        malloc-128    128       0       0           0       0     126          0        0
        malloc-128    128       0       0           0       0     126          0        0
        malloc-128    128       0       0           0       0     126          0        0
        malloc-128    128       0       0           0       0     126          0        0
         malloc-64     64       0       0           0       0     254          0        0
         malloc-64     64       0       0           0       0     254          0        0
         malloc-64     64       0       0           0       0     254          0        0
         malloc-64     64       0       0           0       0     254          0        0
         malloc-64     64       0       0           0       0     254          0        0
         malloc-64     64       0       0           0       0     254          0        0
         malloc-64     64       0       0           0       0     254          0        0
         malloc-64     64       0       0           0       0     254          0        0
         malloc-32     32       0       0           0       0     254          0        0
         malloc-32     32       0       0           0       0     254          0        0
         malloc-32     32       0       0           0       0     254          0        0
         malloc-32     32       0       0           0       0     254          0        0
         malloc-32     32       0       0           0       0     254          0        0
         malloc-32     32       0       0           0       0     254          0        0
         malloc-32     32       0       0           0       0     254          0        0
         malloc-32     32       0       0           0       0     254          0        0
         malloc-16     16       0       0           0       0     254          0        0
         malloc-16     16       0       0           0       0     254          0        0
         malloc-16     16       0       0           0       0     254          0        0
         malloc-16     16       0       0           0       0     254          0        0
         malloc-16     16       0       0           0       0     254          0        0
         malloc-16     16       0       0           0       0     254          0        0
         malloc-16     16       0       0           0       0     254          0        0
         malloc-16     16       0       0           0       0     254          0        0
           pcpu-32     32       0       0           0       0     254          0        0
            pcpu-4      4       0       0           0       0     254          0        0
            fakepg    104       0       0           0       0     126          0        0
          UMA Hash    256       0       0           0       0      62          0        0

Crashes (9):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-freebsd-main 2021/05/23 16:32 freebsd-src c50346bcf5c5 3c7fef33 console log report syz C panic: refcount ADDR wraparound
ci-freebsd-main 2021/05/23 14:24 freebsd-src c50346bcf5c5 3c7fef33 console log report syz C panic: refcount ADDR wraparound
ci-freebsd-main 2021/05/23 14:00 freebsd-src c50346bcf5c5 3c7fef33 console log report syz C panic: refcount ADDR wraparound
ci-freebsd-main 2021/05/23 14:59 freebsd-src c50346bcf5c5 3c7fef33 console log report syz panic: refcount ADDR wraparound
ci-freebsd-main 2021/05/23 14:05 freebsd-src c50346bcf5c5 3c7fef33 console log report panic: refcount ADDR wraparound
ci-freebsd-main 2021/05/23 09:09 freebsd-src c50346bcf5c5 3c7fef33 console log report panic: refcount ADDR wraparound
ci-freebsd-main 2021/05/23 07:16 freebsd-src c50346bcf5c5 3c7fef33 console log report panic: refcount ADDR wraparound
ci-freebsd-i386 2021/05/23 08:02 freebsd-src c50346bcf5c5 3c7fef33 console log report panic: refcount ADDR wraparound
ci-freebsd-i386 2021/05/23 07:34 freebsd-src c50346bcf5c5 3c7fef33 console log report panic: refcount ADDR wraparound
* Struck through repros no longer work on HEAD.