syzbot


Fatal trap 12: page fault in sctp_inpcb_bind

Status: auto-closed as invalid on 2020/03/21 19:07
Reported-by: syzbot+a38c3729810502fc5211@syzkaller.appspotmail.com
First crash: 1796d, last: 1796d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
freebsd Fatal trap 12: page fault in sctp_inpcb_bind (2) 5 1248d 1284d 0/2 closed as dup on 2021/09/09 12:56

Sample crash report:
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address	= 0xbf60
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff8133f3d0
stack pointer	        = 0x28:0xfffffe0024483890
frame pointer	        = 0x28:0xfffffe0024483930
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		= 2251 (syz-executor.1)
trap number		= 12
panic: page fault
cpuid = 1
time = 1577041606
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0024483490
vpanic() at vpanic+0x1c7/frame 0xfffffe0024483500
panic() at panic+0x43/frame 0xfffffe0024483560
trap_fatal() at trap_fatal+0x4cc/frame 0xfffffe00244835e0
trap_pfault() at trap_pfault+0xdc/frame 0xfffffe0024483680
trap() at trap+0x441/frame 0xfffffe00244837c0
calltrap() at calltrap+0x8/frame 0xfffffe00244837c0
--- trap 0xc, rip = 0xffffffff8133f3d0, rsp = 0xfffffe0024483890, rbp = 0xfffffe0024483930 ---
sctp_inpcb_bind() at sctp_inpcb_bind+0x430/frame 0xfffffe0024483930
sctp6_connect() at sctp6_connect+0x208/frame 0xfffffe00244839b0
soconnectat() at soconnectat+0x183/frame 0xfffffe0024483a10
kern_connectat() at kern_connectat+0x1ec/frame 0xfffffe0024483a70
sys_connect() at sys_connect+0xd9/frame 0xfffffe0024483ab0
amd64_syscall() at amd64_syscall+0x499/frame 0xfffffe0024483bf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0024483bf0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x4132ea, rsp = 0x7fffdffdcf38, rbp = 0x3 ---
KDB: enter: panic
[ thread pid 2251 tid 100801 ]
Stopped at      kdb_enter+0x67: movq    $0,0x14600e6(%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         0xfffffe0027200000
rdx                    0x3ffff
rbx                          0
rsp         0xfffffe0024483470
rbp         0xfffffe0024483490
rsi                    0x40001
rdi         0xffffffff810c0ea1  vprintf+0xe1
r8                           0
r9                  0xffffffff
r10                          0
r11         0xfffff8003420ebd0
r12         0xffffffff82068d90  ddb_dbbe
r13                          0
r14         0xffffffff81936bdd
r15         0xffffffff81936bdd
rip         0xffffffff810b6127  kdb_enter+0x67
rflags                    0x82  ll+0x61
kdb_enter+0x67: movq    $0,0x14600e6(%rip)
db> show proc
Process 2251 (syz-executor.1) at 0xfffff80059b4ca60:
 state: NORMAL
 uid: 0  gids: 0, 0, 5
 parent: pid 770 at 0xfffff80003e69530
 ABI: FreeBSD ELF64
 arguments: /root/syz-executor.1
 reaper: 0xfffff800032b8530 reapsubtree: 1
 sigparent: 20
 vmspace: 0xfffff8003af5e000
   (map 0xfffff8003af5e000)
   (map.pmap 0xfffff8003af5e0c0)
   (pmap 0xfffff8003af5e120)
 threads: 5
100255                   RunQ                                syz-executor.1
100799                   S       sbwait  0xfffff80003e2d55c  syz-executor.1
100801                   Run     CPU 1                       syz-executor.1
100802                   L      *sctp-in 0xfffff8003aaafb40  syz-executor.1
100805                   RunQ                                syz-executor.1
db> ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
 2252   783   783     0  R       (threaded)                  syz-executor.3
100434                   RunQ                                syz-executor.3
100804                   S       sbwait  0xfffff80003e9a55c  syz-executor.3
 2251   770   770     0  R       (threaded)                  syz-executor.1
100255                   RunQ                                syz-executor.1
100799                   S       sbwait  0xfffff80003e2d55c  syz-executor.1
100801                   Run     CPU 1                       syz-executor.1
100802                   L      *sctp-in 0xfffff8003aaafb40  syz-executor.1
100805                   RunQ                                syz-executor.1
 2250   771   771     0  R       (threaded)                  syz-executor.2
100470                   RunQ                                syz-executor.2
100782                   S       sbwait  0xfffff80003e248e4  syz-executor.2
100796                   S       uwait   0xfffff800030c1600  syz-executor.2
100798                   S       uwait   0xfffff80003c5fd80  syz-executor.2
 2249   769   769     0  R       (threaded)                  syz-executor.0
100593                   RunQ                                syz-executor.0
100776                   S       select  0xfffff80003cd37c0  syz-executor.0
100781                   S       uwait   0xfffff8003ab4fe00  syz-executor.0
100785                   S       uwait   0xfffff8003ab4fa00  syz-executor.0
100787                   S       uwait   0xfffff80003c5fb80  syz-executor.0
 1935  1929  1935     0  Ss      select  0xfffff8003a21c040  dhclient
 1932     1  1932     0  Ss      select  0xfffff800550702c0  dhclient
 1929  1922   422    65  S       select  0xfffff8003a21acc0  dhclient
 1922   422   422     0  S       wait    0xfffff80003df3530  sh
 1881     1  1881    65  Ss      select  0xfffff8003a21aec0  dhclient
 1513     1  1513     0  Ss      select  0xfffff8003a21a940  dhclient
 1510     1  1510     0  Ss      select  0xfffff8003a21a8c0  dhclient
 1488     1  1488    65  Ss      select  0xfffff8003a21c140  dhclient
  981     1   981     0  Ss      select  0xfffff80003cd3840  dhclient
  978     1   978     0  Ss      select  0xfffff8003a21c2c0  dhclient
  783   766   783     0  Rs                                  syz-executor.3
  771   766   771     0  Rs                                  syz-executor.2
  770   766   770     0  Rs                                  syz-executor.1
  769   766   769     0  Rs                                  syz-executor.0
  766   764   764     0  S       (threaded)                  syz-fuzzer
100085                   S       uwait   0xfffff800030c1400  syz-fuzzer
100105                   S       uwait   0xfffff80003c60480  syz-fuzzer
100106                   S       uwait   0xfffff80003c60680  syz-fuzzer
100107                   S       kqread  0xfffff8000333ee00  syz-fuzzer
100108                   S       uwait   0xfffff8003a20de00  syz-fuzzer
100109                   S       uwait   0xfffff8003a20df00  syz-fuzzer
100110                   S       uwait   0xfffff8003a20e080  syz-fuzzer
100111                   S       uwait   0xfffff80003c5fa80  syz-fuzzer
100112                   S       uwait   0xfffff8003a20e180  syz-fuzzer
100113                   S       uwait   0xfffff8003a20d880  syz-fuzzer
  764   762   764     0  SWs     pause   0xfffff80003d350a8  csh
  762   680   762     0  Ss      select  0xfffff80003cd3a40  sshd
  746     1   746     0  Rs+     CPU 0                       getty
  745     1   745     0  Ss+     ttyin   0xfffff80003af10b0  getty
  744     1   744     0  Ss+     ttyin   0xfffff80003ae10b0  getty
  743     1   743     0  Ss+     ttyin   0xfffff80003ae18b0  getty
  742     1   742     0  Ss+     ttyin   0xfffff80003ae20b0  getty
  741     1   741     0  Ss+     ttyin   0xfffff80003ae28b0  getty
  740     1   740     0  Ss+     ttyin   0xfffff80003ae30b0  getty
  739     1   739     0  Ss+     ttyin   0xfffff80003ae38b0  getty
  738     1   738     0  Ss+     ttyin   0xfffff80003ae40b0  getty
  684     1   684     0  Ss      nanslp  0xffffffff824fee11  cron
  680     1   680     0  Ss      select  0xfffff80003cd4040  sshd
  493     1   493     0  Ds      bo_wwai 0xfffff8003a49d338  syslogd
  422     1   422     0  Ss      wait    0xfffff80003d35a60  devd
  421     1   421    65  Ss      select  0xfffff8003a21c9c0  dhclient
  336     1   336     0  Ss      select  0xfffff8003a21ccc0  dhclient
  333     1   333     0  Ss      select  0xfffff8003a21cb40  dhclient
   21     0     0     0  DL      syncer  0xffffffff825d52e0  [syncer]
   20     0     0     0  DL      vlruwt  0xfffff80003aff000  [vnlru]
   19     0     0     0  DL      (threaded)                  [bufdaemon]
100065                   D       qsleep  0xffffffff825d4798  [bufdaemon]
100070                   D       -       0xffffffff8200a980  [bufspacedaemon-0]
100081                   D       sdflush 0xfffff8000308e0e8  [/ worker]
   18     0     0     0  DL      psleep  0xffffffff825f01c8  [vmdaemon]
   17     0     0     0  DL      (threaded)                  [pagedaemon]
100063                   D       psleep  0xffffffff8261d0d8  [dom0]
100068                   D       launds  0xffffffff8261d0e4  [laundry: dom0]
100069                   D       umarcl  0xffffffff8153dec0  [uma]
   16     0     0     0  DL      -       0xffffffff82359598  [rand_harvestq]
   15     0     0     0  DL      waiting 0xffffffff826626a0  [sctp_iterator]
    9     0     0     0  DL      -       0xffffffff825d419c  [soaiod4]
    8     0     0     0  DL      -       0xffffffff825d419c  [soaiod3]
    7     0     0     0  DL      -       0xffffffff825d419c  [soaiod2]
    6     0     0     0  DL      -       0xffffffff825d419c  [soaiod1]
    5     0     0     0  DL      (threaded)                  [cam]
100031                   D       -       0xffffffff82234940  [doneq0]
100062                   D       -       0xffffffff82234808  [scanner]
    4     0     0     0  DL      crypto_ 0xfffff8000333d690  [crypto returns 1]
    3     0     0     0  DL      crypto_ 0xfffff8000333d630  [crypto returns 0]
    2     0     0     0  DL      crypto_ 0xffffffff825ea268  [crypto]
   14     0     0     0  DL      seqstat 0xfffff8000334f888  [sequencer 00]
   13     0     0     0  DL      (threaded)                  [geom]
100022                   D       -       0xffffffff8261b708  [g_event]
100023                   D       -       0xffffffff8261b718  [g_up]
100024                   D       -       0xffffffff8261b710  [g_down]
   12     0     0     0  WL      (threaded)                  [intr]
100005                   I                                   [swi5: fast taskq]
100009                   I                                   [swi6: task queue]
100010                   I                                   [swi6: Giant taskq]
100017                   I                                   [swi3: vm]
100018                   I                                   [swi1: netisr 0]
100019                   I                                   [swi4: clock (0)]
100020                   I                                   [swi4: clock (1)]
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                                   [irq10: virtio_pci2]
100047                   I                                   [irq1: atkbd0]
100048                   I                                   [irq12: psm0]
100049                   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    0xfffff800032b8530  [init]
   10     0     0     0  DL      audit_w 0xffffffff82663330  [audit]
    0     0     0     0  DLs     (threaded)                  [kernel]
100000                   D       swapin  0xffffffff82609d38  [swapper]
100006                   D       -       0xfffff800032f9000  [config_0]
100007                   D       -       0xfffff800032f2e00  [kqueue_ctx taskq]
100008                   D       -       0xfffff800032f2d00  [aiod_kick taskq]
100011                   D       -       0xfffff800032f2a00  [thread taskq]
100012                   D       -       0xfffff800032f8e00  [if_config_tqg_0]
100013                   D       -       0xfffff800032f8d00  [softirq_0]
100014                   D       -       0xfffff800032f8c00  [softirq_1]
100015                   D       -       0xfffff800032f8b00  [if_io_tqg_0]
100016                   D       -       0xfffff800032f8a00  [if_io_tqg_1]
100021                   D       -       0xfffff80003382100  [firmware taskq]
100026                   D       -       0xfffff80003381e00  [crypto_0]
100027                   D       -       0xfffff80003381e00  [crypto_1]
100041                   D       -       0xfffff80003381a00  [vtnet0 rxq 0]
100042                   D       -       0xfffff80003381900  [vtnet0 txq 0]
100043                   D       -       0xfffff80003381800  [vtnet0 rxq 1]
100044                   D       -       0xfffff80003381700  [vtnet0 txq 1]
100046                   D       vtbslp  0xfffff80003510400  [virtio_balloon]
100050                   D       -       0xfffff80003381600  [mca taskq]
100051                   D       -       0xffffffff824fdb91  [deadlkres]
100058                   D       -       0xfffff80003380b00  [acpi_task_0]
100059                   D       -       0xfffff80003380b00  [acpi_task_1]
100060                   D       -       0xfffff80003380b00  [acpi_task_2]
100061                   D       -       0xfffff80003381d00  [CAM taskq]
db> show all locks
Process 2251 (syz-executor.1) thread 0xfffff8003420e6e0 (100801)
exclusive sleep mutex sctp-inp (inp) r = 0 (0xfffff8003a3d8468) locked @ /syzkaller/managers/main/kernel/sys/netinet/sctp_pcb.c:2918
exclusive rw sctp-info (sctp-info) r = 0 (0xfffffe0004958b50) locked @ /syzkaller/managers/main/kernel/sys/netinet/sctp_pcb.c:2917
exclusive sleep mutex sctp-create (inp_create) r = 0 (0xfffff8003a3d8488) locked @ /syzkaller/managers/main/kernel/sys/netinet6/sctp6_usrreq.c:835
Process 746 (getty) thread 0xfffff80003d5a6e0 (100080)
exclusive sleep mutex ttymtx (ttymtx) r = 0 (0xfffff80003814c08) locked @ /syzkaller/managers/main/kernel/sys/kern/tty.c:216
Process 493 (syslogd) thread 0xfffff80003c5c6e0 (100086)
exclusive lockmgr ufs (ufs) r = 0 (0xfffff8003a49d248) locked @ /syzkaller/managers/main/kernel/sys/kern/vfs_syscalls.c:3431
db> show malloc
              Type        InUse        MemUse     Requests
            devbuf         4213         4851K         4241
             vtbuf           24         1968K           46
         sysctloid        23668         1374K        23732
              kobj          333         1332K          489
            newblk            7         1026K         2755
          vfscache            4         1025K            4
               pcb           27          539K          453
          inodedep           11          517K         1425
         ufs_quota            1          512K            1
          vfs_hash            1          512K            1
           callout            2          512K            2
              intr            4          388K            4
           subproc          135          274K         2329
            acpica         1674          185K        49997
         vnet_data            1          168K            1
          filedesc           21          149K         2655
           pagedep            9          130K         1332
        tfo_ccache            1          128K            1
               sem            4          106K            4
            DEVFS1          105          105K          122
            linker          221           89K          252
               bus          976           79K         3333
          mtx_pool            2           72K            2
               BPF           38           71K           38
          syncache            1           68K            1
          acpitask            1           64K            1
       ddb_capture            1           64K            1
            module          495           62K          495
              umtx          316           40K          316
           kdtrace          189           37K         9416
        gtaskqueue           22           34K           22
         hostcache            1           32K            1
               shm            1           32K            2
            DEVFS3          124           31K          134
               msg            4           30K            4
        DEVFS_RULE           56           27K           56
            ifaddr           75           26K           75
            kbdmux            6           22K            6
              vmem            3           20K            5
              temp           34           17K         2165
         ufs_mount            3           17K            4
           lltable           45           17K           47
              proc            3           17K            3
               tty           16           16K           16
           tidhash            1           16K            1
           ithread           89           15K           89
       ether_multi          172           14K          177
            KTRACE          100           13K          100
             ifnet            7           13K            7
              kenv           95           12K           99
         in6_multi           89           11K           89
      eventhandler          122           11K          122
         pfs_nodes           20           10K           20
              GEOM           60           10K          487
              rman           82           10K          423
           devstat            4            9K            4
              UART           12            9K           12
         bmsafemap            1            8K         1405
               rpc            2            8K            2
             shmfd            1            8K            1
              cred           32            8K          260
       pfs_vncache            1            8K            1
            select           63            8K           63
         sctp_timw           30            8K           30
     audit_evclass          231            8K          289
          routetbl           58            7K           62
           CAM DEV            3            6K          508
            kqueue           61            6K         2259
            plimit           23            6K          398
                vt           11            6K           11
            sglist            5            6K            5
         CAM queue            5            6K         1522
            DEVFSP           76            5K           80
         taskqueue           42            5K           42
           memdesc            1            4K            1
               MCA           32            4K           32
       ufs_dirhash            8            4K           24
             evdev            4            4K            4
          kcovinfo           64            4K           68
           session           31            4K           45
              pgrp           31            4K           45
               UMA          233            4K          233
             hhook           13            4K           13
             lockf           28            3K           47
           acpisem           22            3K           22
          terminal           11            3K           11
         proc-args           50            3K          627
           uidinfo            4            3K            5
          sctp_ifa           17            3K           17
           CAM CCB            1            2K         3555
        local_apic            1            2K            1
           io_apic            1            2K            1
         ipsec-saq            2            2K            2
            ip6ndp           12            2K           21
            Unitno           30            2K         7677
           CAM XPT           22            2K          541
          in_multi            6            2K            7
           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
             clone            8            1K            8
      NFSD session            1            1K            1
        CAM periph            4            1K          270
       inpcbpolicy           26            1K         5996
               mld            6            1K            6
          sctp_ifn            6            1K            6
              igmp            6            1K            6
         toponodes            6            1K            6
            isadev            6            1K            6
             mount           16            1K           86
          pci_link           10            1K           10
             mkdir            5            1K         2630
           CAM SIM            2            1K            2
           softdep            1            1K            1
            diradd            4            1K         1380
         sctp_atcl            1            1K          269
    chacha20random            1            1K            1
             epoch            4            1K            4
              cdev            2            1K            2
 encap_export_host            8            1K            8
              pfil            3            1K            3
               osd            3            1K            9
          freework            2            1K         1509
         newdirblk            4            1K         1315
          freeblks            1            1K         1348
            vnodes            1            1K            1
      NFSD lckfile            1            1K            1
     NFSD V4client            1            1K            1
             DEVFS            9            1K           10
            feeder            7            1K            7
        loginclass            3            1K            3
            soname            5            1K         6019
          CAM path            4            1K         1030
            apmdev            1            1K            1
          atkbddev            2            1K            2
            dirrem            1            1K         1343
          freefile            1            1K         1341
          freefrag            1            1K           10
          pmchooks            1            1K            1
            prison            4            1K            4
     CAM dev queue            2            1K            2
 CAM I/O Scheduler            1            1K            1
          nexusdev            5            1K            5
           entropy            2            1K           40
           tcpfunc            1            1K            1
          sctp_vrf            1            1K            1
              vnet            1            1K            1
          acpiintr            1            1K            1
               pmc            1            1K            1
          filecaps            4            1K          104
              cpus            2            1K            2
         sctp_atky            1            1K          369
    vnet_data_free            1            1K            1
           Per-cpu            1            1K            1
        sctp_socko            1            1K          261
         sctp_athm            1            1K          269
          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         1392
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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
2019/12/22 19:07 freebsd bdb3ec248ab1 8b967267 console log report ci-freebsd-main
* Struck through repros no longer work on HEAD.