syzbot


Fatal trap 12: page fault in in6_unlink_ifa

Status: auto-closed as invalid on 2020/03/02 01:11
Reported-by: syzbot+a80a05a246a09414c2f2@syzkaller.appspotmail.com
First crash: 1606d, last: 1606d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
freebsd Fatal trap 12: page fault in in6_unlink_ifa (2) syz 20 1031d 1418d 0/2 closed as invalid on 2021/09/09 13:22

Sample crash report:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address	= 0xe8
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff813cef50
stack pointer	        = 0x28:0xfffffe0022a56210
frame pointer	        = 0x28:0xfffffe0022a56270
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 774 (syz-executor.3)
trap number		= 12
panic: page fault
cpuid = 0
time = 1575335406
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0022a55e10
vpanic() at vpanic+0x1c7/frame 0xfffffe0022a55e80
panic() at panic+0x43/frame 0xfffffe0022a55ee0
trap_fatal() at trap_fatal+0x4cc/frame 0xfffffe0022a55f60
trap_pfault() at trap_pfault+0xdc/frame 0xfffffe0022a56000
trap() at trap+0x441/frame 0xfffffe0022a56140
calltrap() at calltrap+0x8/frame 0xfffffe0022a56140
--- trap 0xc, rip = 0xffffffff813cef50, rsp = 0xfffffe0022a56210, rbp = 0xfffffe0022a56270 ---
in6_unlink_ifa() at in6_unlink_ifa+0x120/frame 0xfffffe0022a56270
in6_purgeaddr() at in6_purgeaddr+0x59f/frame 0xfffffe0022a56420
if_purgeaddrs() at if_purgeaddrs+0x1a1/frame 0xfffffe0022a564d0
tundtor() at tundtor+0x64a/frame 0xfffffe0022a56530
devfs_destroy_cdevpriv() at devfs_destroy_cdevpriv+0xb5/frame 0xfffffe0022a56560
devfs_close_f() at devfs_close_f+0x7a/frame 0xfffffe0022a56590
_fdrop() at _fdrop+0x38/frame 0xfffffe0022a565c0
closef() at closef+0x2c6/frame 0xfffffe0022a56650
fdescfree_fds() at fdescfree_fds+0xa4/frame 0xfffffe0022a566a0
fdescfree() at fdescfree+0x60f/frame 0xfffffe0022a56770
exit1() at exit1+0x765/frame 0xfffffe0022a567e0
sigexit() at sigexit+0xd73/frame 0xfffffe0022a56ac0
postsig() at postsig+0x416/frame 0xfffffe0022a56b90
ast() at ast+0x70b/frame 0xfffffe0022a56bf0
fast_syscall_common() at fast_syscall_common+0x198/frame 0xfffffe0022a56bf0
--- syscall (32, FreeBSD ELF64, sys_getsockname), rip = 0x483b8a, rsp = 0x7fffffffec78, rbp = 0x7fffffffecb0 ---
KDB: enter: panic
[ thread pid 774 tid 100082 ]
Stopped at      kdb_enter+0x67: movq    $0,0x1468c76(%rip)
db> set $lines = 0
db> set $maxwidth = 0
db> show registers
cs                        0x20
ds                        0x3b  ll+0x1a
es                        0x3b  ll+0x1a
fs                        0x13
gs                        0x1b
ss                        0x28  ll+0x7
rax                       0x12
rcx         0xffffffff810b5d99  vprintf+0xa9
rdx                          0
rbx                          0
rsp         0xfffffe0022a55df0
rbp         0xfffffe0022a55e10
rsi                          0
rdi         0xffffffff810b5dd1  vprintf+0xe1
r8                           0
r9                  0xffffffff
r10                          0
r11         0xfffff80003d9d4f0
r12         0xffffffff82068d70  ddb_dbbe
r13                          0
r14         0xffffffff81926c07
r15         0xffffffff81926c07
rip         0xffffffff810ab057  kdb_enter+0x67
rflags                    0x86  ll+0x65
kdb_enter+0x67: movq    $0,0x1468c76(%rip)
db> show proc
Process 774 (syz-executor.3) at 0xfffff80003d86000:
 state: NORMAL
 uid: 0  gids: 0, 0, 5
 parent: pid 766 at 0xfffff80012496530
 ABI: FreeBSD ELF64
 arguments: /root/syz-executor.3
 reaper: 0xfffff800032c6530 reapsubtree: 1
 sigparent: 20
 vmspace: 0xfffff80003d2e000
   (map 0xfffff80003d2e000)
   (map.pmap 0xfffff80003d2e0d0)
   (pmap 0xfffff80003d2e130)
 threads: 1
100082                   Run     CPU 0                       syz-executor.3
db> ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
 1689  1688   422     0  L      *in6_ifa 0xfffff800030993c0  ifconfig
 1688  1684   422     0  S       wait    0xfffff8005d495530  sh
 1687     1  1687     0  Ss      select  0xfffff80003346bc0  dhclient
 1684  1677   422     0  S       wait    0xfffff8005d495000  dhclient
 1677   422   422     0  S       wait    0xfffff80003d8aa60  sh
 1664   776   776     0  R       (threaded)                  syz-executor.2
100071                   RunQ                                syz-executor.2
100266                   S       sbwait  0xfffff80003e591d4  syz-executor.2
100243                   S       uwait   0xfffff80003302780  syz-executor.2
100245                   S       uwait   0xfffff80003a23500  syz-executor.2
100252                   S       uwait   0xfffff800037e4280  syz-executor.2
 1660   769   769     0  R       (threaded)                  syz-executor.0
100140                   RunQ                                syz-executor.0
100248                   S       uwait   0xfffff80003a24700  syz-executor.0
100253                   S       uwait   0xfffff80034011400  syz-executor.0
100255                   S       sbwait  0xfffff80003e59c6c  syz-executor.0
100250                   S       uwait   0xfffff80034011100  syz-executor.0
100263                   S       uwait   0xfffff800037e6080  syz-executor.0
 1546     1  1546    65  Rs                                  dhclient
 1014     1  1014     0  Ss      select  0xfffff800033480c0  dhclient
 1010     1  1010     0  Ss      select  0xfffff80003347140  dhclient
  776   766   776     0  Rs                                  syz-executor.2
  774   766   774     0  REs     CPU 0                       syz-executor.3
  769   766   769     0  Rs                                  syz-executor.0
  766   764   764     0  RE      CPU 1                       syz-fuzzer
  764   762   764     0  SWs     pause   0xfffff800124960a8  csh
  762   680   762     0  Ss      select  0xfffff80003348b40  sshd
  746     1   746     0  Rs+                                 getty
  745     1   745     0  Ss+     ttyin   0xfffff80003b288b0  getty
  744     1   744     0  Ss+     ttyin   0xfffff80003b270b0  getty
  743     1   743     0  Ss+     ttyin   0xfffff80003b278b0  getty
  742     1   742     0  Ss+     ttyin   0xfffff80003b2a0b0  getty
  741     1   741     0  Ss+     ttyin   0xfffff800033218b0  getty
  740     1   740     0  Ss+     ttyin   0xfffff800033800b0  getty
  739     1   739     0  Ss+     ttyin   0xfffff800033808b0  getty
  738     1   738     0  Ss+     ttyin   0xfffff8000337f0b0  getty
  684     1   684     0  SWs     nanslp  0xffffffff824fc8c0  cron
  680     1   680     0  Ss      select  0xfffff80003348040  sshd
  493     1   493     0  Ds      bo_wwai 0xfffff800123bfe78  syslogd
  422     1   422     0  Ss      wait    0xfffff80003d86530  devd
  421     1   421    65  Rs                                  dhclient
  336     1   336     0  Ss      select  0xfffff80003a43640  dhclient
  333     1   333     0  Ss      select  0xfffff80003348940  dhclient
   21     0     0     0  DL      syncer  0xffffffff825d2da0  [syncer]
   20     0     0     0  DL      vlruwt  0xfffff80003adc000  [vnlru]
   19     0     0     0  RL      (threaded)                  [bufdaemon]
100063                   RunQ                                [bufdaemon]
100066                   D       -       0xffffffff8200a900  [bufspacedaemon-0]
100078                   D       sdflush 0xfffff80003a074e8  [/ worker]
   18     0     0     0  DL      psleep  0xffffffff825edc88  [vmdaemon]
   17     0     0     0  RL      (threaded)                  [pagedaemon]
100061                   RunQ                                [dom0]
100064                   D       launds  0xffffffff8261a8a4  [laundry: dom0]
100065                   D       umarcl  0xffffffff81532cb0  [uma]
   16     0     0     0  DL      -       0xffffffff82358518  [rand_harvestq]
   15     0     0     0  DL      waiting 0xffffffff8265fe70  [sctp_iterator]
    9     0     0     0  DL      -       0xffffffff825d1c5c  [soaiod4]
    8     0     0     0  DL      -       0xffffffff825d1c5c  [soaiod3]
    7     0     0     0  DL      -       0xffffffff825d1c5c  [soaiod2]
    6     0     0     0  DL      -       0xffffffff825d1c5c  [soaiod1]
    5     0     0     0  DL      (threaded)                  [cam]
100031                   D       -       0xffffffff822338c0  [doneq0]
100060                   D       -       0xffffffff82233788  [scanner]
    4     0     0     0  DL      crypto_ 0xfffff800033d8090  [crypto returns 1]
    3     0     0     0  DL      crypto_ 0xfffff800033d8030  [crypto returns 0]
    2     0     0     0  DL      crypto_ 0xffffffff825e7d38  [crypto]
   14     0     0     0  DL      seqstat 0xfffff80003338c88  [sequencer 00]
   13     0     0     0  DL      (threaded)                  [geom]
100022                   D       -       0xffffffff82618e90  [g_event]
100023                   D       -       0xffffffff82618ea0  [g_up]
100024                   D       -       0xffffffff82618e98  [g_down]
   12     0     0     0  WL      (threaded)                  [intr]
100006                   I                                   [swi5: fast taskq]
100010                   I                                   [swi6: task queue]
100011                   I                                   [swi6: Giant taskq]
100017                   I                                   [swi4: clock (0)]
100018                   I                                   [swi4: clock (1)]
100019                   I                                   [swi3: vm]
100020                   I                                   [swi1: netisr 0]
100032                   I                                   [irq24: virtio_pci0]
100033                   I                                   [irq25: virtio_pci0]
100034                   I                                   [irq26: virtio_pci0]
100035                   I                                   [irq27: virtio_pci0]
100036                   I                                   [irq28: virtio_pci1]
100037                   I                                   [irq29: virtio_pci1]
100038                   I                                   [irq30: virtio_pci1]
100039                   I                                   [irq31: virtio_pci1]
100040                   I                                   [irq32: virtio_pci1]
100045                   I                                   [irq1: atkbd0]
100046                   I                                   [irq12: psm0]
100047                   I                                   [swi0: uart uart++]
   11     0     0     0  RL      (threaded)                  [idle]
100003                   CanRun                              [idle: cpu0]
100004                   CanRun                              [idle: cpu1]
    1     0     1     0  SLs     wait    0xfffff800032c6530  [init]
   10     0     0     0  DL      audit_w 0xffffffff82660b00  [audit]
    0     0     0     0  DLs     (threaded)                  [kernel]
100000                   D       swapin  0xffffffff82607808  [swapper]
100005                   D       -       0xfffff800031f5a00  [thread taskq]
100007                   D       -       0xfffff800031ebe00  [config_0]
100008                   D       -       0xfffff800031f5500  [kqueue_ctx taskq]
100009                   D       -       0xfffff800031f5300  [aiod_kick taskq]
100012                   D       -       0xfffff800031ebd00  [if_config_tqg_0]
100013                   D       -       0xfffff800031ebc00  [softirq_0]
100014                   D       -       0xfffff800031ebb00  [softirq_1]
100015                   D       -       0xfffff800031eba00  [if_io_tqg_0]
100016                   D       -       0xfffff800031eb900  [if_io_tqg_1]
100021                   D       -       0xfffff800031f4200  [firmware taskq]
100026                   D       -       0xfffff800031f3b00  [crypto_0]
100027                   D       -       0xfffff800031f3b00  [crypto_1]
100041                   D       -       0xfffff80003555900  [vtnet0 rxq 0]
100042                   D       -       0xfffff80003555800  [vtnet0 txq 0]
100043                   D       -       0xfffff80003555700  [vtnet0 rxq 1]
100044                   D       -       0xfffff80003555600  [vtnet0 txq 1]
100048                   D       -       0xfffff800031f6e00  [mca taskq]
100051                   D       -       0xffffffff824fb641  [deadlkres]
100056                   D       -       0xfffff80003a2f300  [acpi_task_0]
100057                   D       -       0xfffff80003a2f300  [acpi_task_1]
100058                   D       -       0xfffff80003a2f300  [acpi_task_2]
100059                   D       -       0xfffff800031f3400  [CAM taskq]
  770   766   770     0  Z                                   syz-executor.1
db> show all locks
Process 1664 (syz-executor.2) thread 0xfffff80012cb5000 (100266)
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xfffff80003e59178) locked @ /syzkaller/managers/main/kernel/sys/kern/uipc_sockbuf.c:393
Process 774 (syz-executor.3) thread 0xfffff80003da76e0 (100082)
exclusive rm in6_ifaddr_lock (in6_ifaddr_lock) r = 0 (0xffffffff82660028) locked @ /syzkaller/managers/main/kernel/sys/netinet6/in6.c:1337
Process 766 (syz-fuzzer) thread 0xfffff8001258c000 (100101)
exclusive rw vm object (vm object) r = 0 (0xfffff800341e0738) locked @ /syzkaller/managers/main/kernel/sys/vm/vm_object.c:592
Process 493 (syslogd) thread 0xfffff800124ab6e0 (100092)
exclusive lockmgr ufs (ufs) r = 0 (0xfffff800123bfd88) locked @ /syzkaller/managers/main/kernel/sys/kern/vfs_syscalls.c:3424
db> show malloc
              Type        InUse        MemUse     Requests
            devbuf         4206         4793K         4234
             vtbuf           24         1968K           46
           callout            3         1672K            3
              kobj          333         1332K          489
         sysctloid        22744         1314K        22806
            newblk           17         1028K         3715
          vfscache            4         1025K            4
          inodedep          213          618K          945
               pcb           30          546K         1431
         ufs_quota            1          512K            1
          vfs_hash            1          512K            1
              intr            4          388K            4
           subproc          128          257K         1763
            acpica         1674          185K        49400
         vnet_data            1          168K            1
           pagedep           10          131K          775
        tfo_ccache            1          128K            1
               sem            4          106K            4
            DEVFS1          105          105K          122
          filedesc           13           93K         1531
            linker          221           89K          252
               bus          969           78K         3157
          mtx_pool            2           72K            2
          syncache            1           68K            1
          acpitask            1           64K            1
       ddb_capture            1           64K            1
            module          495           62K          495
              umtx          320           40K          320
               BPF           22           36K           30
        gtaskqueue           22           34K           22
         hostcache            1           32K            1
               shm            1           32K           12
           kdtrace          167           32K         5654
            DEVFS3          124           31K          134
               msg            4           30K            4
        DEVFS_RULE           56           27K           56
            dirrem          199           25K          819
          freefile          199           25K          816
            ifaddr           72           24K           75
            kbdmux            6           22K            6
              vmem            3           20K            6
              temp           34           17K         2238
         ufs_mount            3           17K            4
              proc            3           17K            3
               tty           16           16K           16
           tidhash            1           16K            1
              cred           57           15K          280
           ithread           87           15K           87
           lltable           38           13K           51
            KTRACE          100           13K          100
             ifnet            7           13K            7
       ether_multi          146           12K          177
              kenv           95           12K           99
      eventhandler          122           11K          122
         pfs_nodes           20           10K           20
              GEOM           60           10K          487
              rman           80           10K          421
         in6_multi           65            9K           89
         bmsafemap            2            9K          920
           devstat            4            9K            4
              UART           12            9K           12
               rpc            2            8K            2
         sctp_timw           32            8K           32
             shmfd            1            8K            1
       pfs_vncache            1            8K            1
            select           59            8K           59
     audit_evclass          231            8K          289
           CAM DEV            3            6K          508
            plimit           22            6K          405
                vt           11            6K           11
          routetbl           44            6K           62
            sglist            5            6K            5
         CAM queue            5            6K         1522
         taskqueue           42            5K           42
       ufs_dirhash           12            5K           26
           CAM CCB            2            4K         6604
           memdesc            1            4K            1
               MCA           32            4K           32
             evdev            4            4K            4
               UMA          233            4K          233
         sctp_atcl            7            4K          897
            kqueue           55            4K         1696
           session           27            4K           43
              pgrp           27            4K           45
             hhook           13            4K           13
         sctp_stro            3            3K          258
            DEVFSP           46            3K           78
          terminal           11            3K           11
         proc-args           48            3K          627
           acpisem           21            3K           21
             lockf           24            3K           44
          freework           11            3K         1366
          freeblks           10            3K          848
          kcovinfo           39            3K           68
           uidinfo            4            3K            5
        local_apic            1            2K            1
           io_apic            1            2K            1
         ipsec-saq            2            2K            2
            ip6ndp           12            2K           21
            Unitno           32            2K         2433
          sctp_ifa           13            2K           17
           CAM XPT           22            2K          541
           acpidev           20            2K           20
            crypto            2            2K            2
               msi            9            2K            9
               tun            7            2K            7
       ipsecpolicy            1            1K            1
            sahead            1            1K            1
          secasvar            1            1K            1
          in_multi            4            1K            7
             clone            8            1K            8
      NFSD session            1            1K            1
             mkdir            7            1K         1504
        CAM periph            4            1K          270
               mld            6            1K            6
              igmp            6            1K            6
         toponodes            6            1K            6
            isadev            6            1K            6
             mount           16            1K           86
          pci_link           10            1K           10
            diradd            5            1K          854
           CAM SIM            2            1K            2
           softdep            1            1K            1
          sctp_ifn            4            1K            6
    chacha20random            1            1K            1
             epoch            4            1K            4
              cdev            2            1K            2
       inpcbpolicy           15            1K         2503
 encap_export_host            8            1K            8
         sctp_atky           10            1K         1155
              pfil            3            1K            3
               osd            3            1K            9
         newdirblk            4            1K          752
         sctp_aadr            4            1K            4
            vnodes            1            1K            1
               iov            1            1K        16682
      NFSD lckfile            1            1K            1
     NFSD V4client            1            1K            1
             DEVFS            9            1K           10
            feeder            7            1K            7
        loginclass            3            1K            3
          CAM path            4            1K         1030
            apmdev            1            1K            1
          atkbddev            2            1K            2
          pmchooks            1            1K            1
            prison            4            1K            4
     CAM dev queue            2            1K            2
 CAM I/O Scheduler            1            1K            1
         sctp_athm            7            1K          899
            soname            4            1K         6061
          sctp_map            6            1K          516
          nexusdev            5            1K            5
           entropy            2            1K           39
           tcpfunc            1            1K            1
          sctp_vrf            1            1K            1
              vnet            1            1K            1
          acpiintr            1            1K            1
               pmc            1            1K            1
              cpus            2            1K            2
    vnet_data_free            1            1K            1
           Per-cpu            1            1K            1
          filecaps            2            1K          101
          p1003.1b            1            1K            1
        madt_table            0            0K            2
               PUC            0            0K            0
          ppbusdev            0            0K            0
agtiapi_MemAlloc malloc            0            0K            0
    osti_cacheable            0            0K            0
          tempbuff            0            0K            0
          tempbuff            0            0K            0
            pvscsi            0            0K            0
          smartpqi            0            0K            0
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
     STLock malloc            0            0K            0
          CCB List            0            0K            0
              iavf            0            0K            0
               ixl            0            0K            0
            sr_iov            0            0K            0
               OCS            0            0K            0
               OCS            0            0K            0
              nvme            0            0K            0
               nvd            0            0K            0
            netmap            0            0K            0
            mwldev            0            0K            0
        MVS driver            0            0K            0
       fpukern_ctx            0            0K            0
          xen_intr            0            0K            0
     CAM ccb queue            0            0K            0
           xen_hvm            0            0K            0
         legacydrv            0            0K            0
            qpidrv            0            0K            0
          mrsasbuf            0            0K            0
          mpt_user            0            0K            0
      dmar_idpgtbl            0            0K            0
          dmar_dom            0            0K            0
          dmar_ctx            0            0K            0
       dmar_dmamap            0            0K            0
          mps_user            0            0K            0
            MPSSAS            0            0K            0
              isci            0            0K            0
           bxe_ilt            0            0K            0
            xenbus            0            0K            0
     vm_fictitious            0            0K            0
               mps            0            0K            0
          mpr_user            0            0K            0
            MPRSAS            0            0K            0
           UMAHash            0            0K            0
         vm_pgdata            0            0K            0
           jblocks            0            0K            0
          savedino            0            0K          725
          sentinel            0            0K            0
            jfsync            0            0K            0
            jtrunc            0            0K            0
             sbdep            0            0K           19
           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
          freefrag            0            0K           17
        allocindir            0            0K            0
          indirdep            0            0K          817
       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
             xform            0            0K            0
               NLM            0            0K            0
 nfsclient_nlminfo            0            0K            0
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db> show ktr
No such command; use "help" to list available commands

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/03 01:10 freebsd 916bbdbf6684 ab342da3 console log report ci-freebsd-main
* Struck through repros no longer work on HEAD.