syzbot


panic: m_copydata: null mbpuafn

Status: closed as dup on 2019/11/07 14:24
Reported-by: syzbot+b7c953ceea026e17a6da@syzkaller.appspotmail.com
First crash: 1622d, last: 1622d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
panic: m_copydata: null mbuf C 396 1443d 1630d

Sample crash report:
panic: m_copydata: null mbpuafn
i
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 286114   5653      0           0  0x4000000    1  syz-executor.0
*439894   8057      0     0x14000      0x200    0  softnet
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
m_copydata(fffffd8061ea2900,6f8,8,fffffd80690a9220) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline]
m_copydata(fffffd8061ea2900,6f8,8,fffffd80690a9220) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722
ip6_pullexthdr(fffffd8061ea2900,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1149
ip6_savecontrol(fffffd806f6d1118,fffffd8061ea2900,ffff800020a36e40) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1036
rip6_input(ffff800020a37098,ffff800020a370a4,0,18) at rip6_input+0x50b sys/netinet6/raw_ip6.c:206
ip_deliver(ffff800020a37098,ffff800020a370a4,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665
ip6_input_if(ffff800020a37098,ffff800020a370a4,29,0,ffff80000066d000) at ip6_input_if+0x17cb ip6_ours sys/netinet6/ip6_input.c:518 [inline]
ip6_input_if(ffff800020a37098,ffff800020a370a4,29,0,ffff80000066d000) at ip6_input_if+0x17cb sys/netinet6/ip6_input.c:340
ipv6_input(ffff80000066d000,fffffd8065fb1900) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171
if_input_local(ffff80000066d000,fffffd8065fb1900,18) at if_input_local+0x121 sys/net/if.c:783
loinput(ffff80000066d000,fffffd8065fb1900,0) at loinput+0x4f sys/net/if_loop.c:235
if_input_process(ffff80000066d000,ffff800020a37208) at if_input_process+0xfb if_ih_input sys/net/if.c:912 [inline]
if_input_process(ffff80000066d000,ffff800020a37208) at if_input_process+0xfb sys/net/if.c:946
ifiq_process(ffff80000066d3f0) at ifiq_process+0x80 sys/net/ifq.c:607
taskq_thread(ffff800000023080) at taskq_thread+0x9c sys/kern/kern_task.c:368
end trace frame: 0x0, count: 1
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
m_copydata: null mbuf
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
m_copydata(fffffd8061ea2900,6f8,8,fffffd80690a9220) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline]
m_copydata(fffffd8061ea2900,6f8,8,fffffd80690a9220) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722
ip6_pullexthdr(fffffd8061ea2900,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1149
ip6_savecontrol(fffffd806f6d1118,fffffd8061ea2900,ffff800020a36e40) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1036
rip6_input(ffff800020a37098,ffff800020a370a4,0,18) at rip6_input+0x50b sys/netinet6/raw_ip6.c:206
ip_deliver(ffff800020a37098,ffff800020a370a4,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665
ip6_input_if(ffff800020a37098,ffff800020a370a4,29,0,ffff80000066d000) at ip6_input_if+0x17cb ip6_ours sys/netinet6/ip6_input.c:518 [inline]
ip6_input_if(ffff800020a37098,ffff800020a370a4,29,0,ffff80000066d000) at ip6_input_if+0x17cb sys/netinet6/ip6_input.c:340
ipv6_input(ffff80000066d000,fffffd8065fb1900) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171
if_input_local(ffff80000066d000,fffffd8065fb1900,18) at if_input_local+0x121 sys/net/if.c:783
loinput(ffff80000066d000,fffffd8065fb1900,0) at loinput+0x4f sys/net/if_loop.c:235
if_input_process(ffff80000066d000,ffff800020a37208) at if_input_process+0xfb if_ih_input sys/net/if.c:912 [inline]
if_input_process(ffff80000066d000,ffff800020a37208) at if_input_process+0xfb sys/net/if.c:946
ifiq_process(ffff80000066d3f0) at ifiq_process+0x80 sys/net/ifq.c:607
taskq_thread(ffff800000023080) at taskq_thread+0x9c sys/kern/kern_task.c:368
end trace frame: 0x0, count: -14
ddb{0}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800020a36bb0
rbx               0xffff800020a36c60
rdx               0xffff800020a10278
rcx                                0
rax                                0
r8                0xffffffff81879bcf    kprintf+0x16f
r9                               0x1
r10                             0x25
r11                0x40c2b7b835e1ac1
r12                     0x3000000008
r13               0xffff800020a36bc0
r14                            0x100
r15                              0x1
rip               0xffffffff81db2358    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800020a36ba0
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (softnet) pid=439894 stat=onproc
    flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
    pri=32, usrpri=50, nice=20
    forw=0xffffffffffffffff, list=0xffff800020a10000,0xffff800020a10ee0
    process=0xffff800020a12000 user=0xffff800020a32000, vmspace=0xffffffff82641920
    estcpu=0, cpticks=0, pctcpu=0.0
    user=0, sys=0, intr=0
ddb{0}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 14965  396456  54695      0  2           0                syz-executor.1
 14965  252127  54695      0  2   0x4000000                syz-executor.1
  5653  206399  33596      0  2           0                syz-executor.0
  5653  196478  33596      0  3   0x4000000  netlock       syz-executor.0
  5653  286114  33596      0  7   0x4000000                syz-executor.0
 33596   92517   8029      0  3        0x82  nanosleep     syz-executor.0
 54695   43697   8029      0  3        0x82  nanosleep     syz-executor.1
 19299   48406      1      0  3    0x100083  ttyopn        getty
 28207  234465      0      0  3     0x14200  bored         sosplice
  8029  155744  29363      0  3        0x82  thrsleep      syz-fuzzer
  8029  281445  29363      0  3   0x4000082  thrsleep      syz-fuzzer
  8029  350795  29363      0  3   0x4000082  thrsleep      syz-fuzzer
  8029  496943  29363      0  3   0x4000082  thrsleep      syz-fuzzer
  8029  396539  29363      0  3   0x4000082  kqread        syz-fuzzer
  8029  310217  29363      0  3   0x4000082  thrsleep      syz-fuzzer
  8029  164246  29363      0  3   0x4000082  thrsleep      syz-fuzzer
  8029  346991  29363      0  3   0x4000082  thrsleep      syz-fuzzer
  8029  223677  29363      0  3   0x4000082  thrsleep      syz-fuzzer
  8029  199546  29363      0  3   0x4000082  thrsleep      syz-fuzzer
 29363  424449  68128      0  3    0x10008a  pause         ksh
 68128  499690  86569      0  3        0x92  select        sshd
 86569  480905      1      0  3        0x80  select        sshd
 89016  520778  53292     74  3    0x100092  bpf           pflogd
 53292   82039      1      0  3        0x80  netio         pflogd
 41021   57293  63521     73  3    0x100090  kqread        syslogd
 63521  204867      1      0  3    0x100082  netio         syslogd
 11648  202060      1     77  3    0x100090  poll          dhclient
 53239   70734      1      0  3        0x80  poll          dhclient
 64677  135019      0      0  2     0x14200                zerothread
 69605   26593      0      0  3     0x14200  aiodoned      aiodoned
 10247  237701      0      0  3     0x14200  syncer        update
 87747  341243      0      0  3     0x14200  cleaner       cleaner
 79695  329877      0      0  3     0x14200  reaper        reaper
 76350    3514      0      0  3     0x14200  pgdaemon      pagedaemon
 26011  414741      0      0  3     0x14200  bored         crynlk
 76294  453269      0      0  3     0x14200  bored         crypto
 81250  195215      0      0  3  0x40014200  acpi0         acpi0
 58856  184483      0      0  3  0x40014200                idle1
* 8057  439894      0      0  7     0x14200                softnet
 82950  343039      0      0  3     0x14200  bored         systqmp
 29054  108401      0      0  3     0x14200  bored         systq
 43839   58620      0      0  3  0x40014200  bored         softclock
  4492  517103      0      0  3  0x40014200                idle0
 99327  445079      0      0  3     0x14200  bored         smr
     1  149554      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{0}> show all locks
Process 5653 (syz-executor.0) thread 0xffff800020ab1b40 (206399)
shared rwlock vmmaplk r = 0 (0xfffffd807f00a468)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1448
#2  uvm_fault+0xd85 sys/uvm/uvm_fault.c:524
#3  pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199
#4  usertrap+0x21a sys/arch/amd64/amd64/trap.c:369
#5  recall_trap+0x8
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82645558)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162
#2  usertrap+0x21a sys/arch/amd64/amd64/trap.c:369
#3  recall_trap+0x8
Process 8057 (softnet) thread 0xffff800020a10278 (439894)
shared rwlock netlock r = 0 (0xffffffff824fd158)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  if_input_process+0x84 sys/net/if.c:944
#2  ifiq_process+0x80 sys/net/ifq.c:607
#3  taskq_thread+0x9c sys/kern/kern_task.c:368
#4  proc_trampoline+0x1c
shared rwlock softnet r = 0 (0xffff8000000230e0)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  taskq_thread+0x8f sys/kern/kern_task.c:367
#2  proc_trampoline+0x1c
ddb{0}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim Kern Lim
         devbuf  9619   7100K    8889K  78643K     53709        0        0
            pcb    17     10K      12K  78643K      2125        0        0
         rtable   185     17K      18K  78643K      9169        0        0
         ifaddr   237     60K      61K  78643K      2334        0        0
       counters    39     33K      33K  78643K        39        0        0
       ioctlops     0      0K       4K  78643K      1937        0        0
            iov     0      0K      24K  78643K      1630        0        0
          mount     1      1K       1K  78643K         1        0        0
         vnodes  1240     78K      78K  78643K     14426        0        0
      UFS quota     1     32K      32K  78643K         1        0        0
      UFS mount     5     36K      36K  78643K         5        0        0
            shm     2      1K       9K  78643K       249        0        0
         VM map    51     25K      25K  78643K        70        0        0
            sem    12      0K       1K  78643K      1988        0        0
        dirhash    12      2K       2K  78643K        12        0        0
           ACPI  1808    196K     290K  78643K     12765        0        0
      file desc     6     17K      25K  78643K     11420        0        0
          sigio     0      0K       0K  78643K      1449        0        0
           proc    62     63K      95K  78643K      2782        0        0
        subproc    32      2K       2K  78643K       731        0        0
    NFS srvsock     1      0K       0K  78643K         1        0        0
     NFS daemon     1     16K      16K  78643K         1        0        0
    ip_moptions     0      0K       1K  78643K      1390        0        0
       in_multi    48      3K       3K  78643K      3552        0        0
    ether_multi     1      0K       0K  78643K        63        0        0
            mrt     0      0K       0K  78643K        31        0        0
    ISOFS mount     1     32K      32K  78643K         1        0        0
  MSDOSFS mount     1     16K      16K  78643K         1        0        0
           ttys   102    450K     450K  78643K       102        0        0
           exec     0      0K       1K  78643K      1389        0        0
        pagedep     1      8K       8K  78643K         1        0        0
       inodedep     1     32K      32K  78643K         1        0        0
         newblk     1      0K       0K  78643K         1        0        0
        VM swap     7     26K      26K  78643K         7        0        0
       UVM amap   229    442K     442K  78643K     37369        0        0
       UVM aobj   130      5K       5K  78643K       138        0        0
        memdesc     1      4K       4K  78643K         1        0        0
    crypto data     1      1K       1K  78643K         1        0        0
    ip6_options     2      0K       2K  78643K      1945        0        0
            NDP    24      0K       1K  78643K       984        0        0
           temp   209   3565K    4205K  78643K    216824        0        0
         kqueue     0      0K       0K  78643K        47        0        0
      SYN cache     2     16K      16K  78643K         2        0        0
ddb{0}> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp         64      120    0      114     1     0     1     1     0     8    0
plcache    128       20    0        0     1     0     1     1     0     8    0
rtpcb       80     1279    0     1277     1     0     1     1     0     8    0
rtentry    112     2539    0     2465     5     2     3     3     0     8    0
unpcb      120    13542    0    13523    15    14     1     2     0     8    0
syncache   264       30    0       30    15    15     0     1     0     8    0
tcpqe       32       81    0       81     6     6     0     1     0     8    0
tcpcb      544     3676    0     3667    32    31     1    11     0     8    0
inpcb      280    29985    0    29971    59    56     3     9     0     8    2
rttmr       72        8    0        8     6     6     0     1     0     8    0
ip6q        72       12    0       12     6     6     0     1     0     8    0
ip6af       40       22    0       22     5     5     0     1     0     8    0
nd6         48      562    0      558     3     2     1     1     0     8    0
pkpcb       40       31    0       31    13    13     0     1     0     8    0
swfcl       56        5    0        0     1     0     1     1     0     8    0
ppxss      1128     179    0      179    30    29     1     1     0     8    1
pffrag     232      654    0      654    40    40     0    16     0   482    0
pffrnode    88      307    0      307    25    25     0     1     0     8    0
pffrent     40    11810    0    11810    28    28     0     4     0     8    0
pfosfp      40      846    0      846     5     5     0     5     0     8    0
pfosfpen   112     1428    0     1428    21    21     0    21     0     8    0
pfstitem    24     1798    0     1756     3     1     2     2     0     8    0
pfstkey    112     1801    0     1759    16    12     4    10     0     8    0
pfstate    328     1801    0     1756    52    46     6    27     0     8    0
pfrule     1360      21    0       16     2     1     1     2     0     8    0
art_heap8  4096      12    0        8    10     6     4     6     0     8    0
art_heap4  256    14288    0    14009    42    24    18    20     0     8    0
art_table   32    14300    0    14017     3     0     3     3     0     8    0
art_node    16     2534    0     2482     1     0     1     1     0     8    0
sysvmsgpl   40       19    0        9     1     0     1     1     0     8    0
semupl     112        2    0        2     1     1     0     1     0     8    0
semapl     112     1986    0     1976     1     0     1     1     0     8    0
shmpl      112      136    0        8     4     0     4     4     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino1pl    128    18307    0    16873    47     0    47    47     0     8    0
ffsino     272    18307    0    16873    96     0    96    96     0     8    0
nchpl      144    36301    0    35842    61    41    20    61     0     8    0
uvmvnodes   72     6779    0        0   124     0   124   124     0     8    0
vnodes     208     6779    0        0   357     0   357   357     0     8    0
namei      1024  117374    0   117374     5     4     1     1     0     8    1
percpumem   16       30    0        0     1     0     1     1     0     8    0
vcpupl     1984      49    0        0     7     0     7     7     0     8    0
vmpool     552       68    0       19     4     0     4     4     0     8    0
scsiplug    64        8    0        8     4     4     0     1     0     8    0
scxspl     192   105455    0   105455    54    53     1     7     0     8    1
plimitpl   152      468    0      460     1     0     1     1     0     8    0
sigapl     432    11501    0    11485     3     1     2     3     0     8    0
futexpl     56   245634    0   245634     2     1     1     1     0     8    1
knotepl    112     1640    0     1621     6     5     1     3     0     8    0
kqueuepl   104     2430    0     2428     4     3     1     4     0     8    0
pipepl     112     8078    0     8059    18    17     1     2     0     8    0
fdescpl    488    11502    0    11485     3     0     3     3     0     8    0
filepl     152   107015    0   106910    69    64     5    14     0     8    0
lockfpl    104     2852    0     2851     1     0     1     1     0     8    0
lockfspl    48      916    0      915     1     0     1     1     0     8    0
sessionpl  112       65    0       54     1     0     1     1     0     8    0
pgrppl      48      181    0      170     1     0     1     1     0     8    0
ucredpl     96     9821    0     9810     1     0     1     1     0     8    0
zombiepl   144    11490    0    11490     3     2     1     1     0     8    1
processpl  896    11523    0    11490     4     0     4     4     0     8    0
procpl     632    34387    0    34342    20    15     5     5     0     8    0
srpgc       64       76    0       76    23    23     0     1     0     8    0
sosppl     128      228    0      228    23    23     0     1     0     8    0
sockpl     384    46171    0    46133   109   103     6    15     0     8    1
mcl64k     65536    495    0        0    41     9    32    35     0     8    0
mcl16k     16384     41    0        0     5     3     2     3     0     8    0
mcl12k     12288     49    0        0     2     0     2     2     0     8    0
mcl9k      9216      32    0        0     2     0     2     2     0     8    0
mcl8k      8192      19    0        0     3     0     3     3     0     8    0
mcl4k      4096      33    0        0     3     0     3     3     0     8    0
mcl2k2     2112      12    0        0     1     0     1     1     0     8    0
mcl2k      2048     396    0        0    24    13    11    20     0     8    0
mtagpl      80       69    0        0     1     0     1     1     0     8    0
mbufpl     256     1668    0        0    63     1    62    62     0     8    0
bufpl      256    38285    0    31227   442     0   442   442     0     8    0
anonpl      16  1093282    0  1070177   251   145   106   118     0   124    0
amapchunkpl 152   72145    0    71731   130   113    17    24     0   158    0
amappl16   192    55526    0    54267   235   171    64    74     0     8    0
amappl15   184      527    0      527     5     5     0     1     0     8    0
amappl14   176     2123    0     2116     1     0     1     1     0     8    0
amappl13   168     3441    0     3441     6     6     0     1     0     8    0
amappl12   160      174    0      172     1     0     1     1     0     8    0
amappl11   152     1114    0     1098     1     0     1     1     0     8    0
amappl10   144      648    0      643     1     0     1     1     0     8    0
amappl9    136     3702    0     3698     1     0     1     1     0     8    0
amappl8    128     3360    0     3282     3     0     3     3     0     8    0
amappl7    120      853    0      843     1     0     1     1     0     8    0
amappl6    112     1020    0     1003     1     0     1     1     0     8    0
amappl5    104      710    0      695     1     0     1     1     0     8    0
amappl4     96    12007    0    11974     1     0     1     1     0     8    0
amappl3     88     2730    0     2719     1     0     1     1     0     8    0
amappl2     80    90320    0    90229     3     1     2     3     0     8    0
amappl1     72   249204    0   248743    25    15    10    20     0     8    0
amappl      80    35422    0    35343     2     0     2     2     0    84    0
dma4096    4096       1    0        1     1     1     0     1     0     8    0
dma256     256        6    0        6     1     1     0     1     0     8    0
dma128     128      253    0      253     1     1     0     1     0     8    0
dma64       64        6    0        6     1     1     0     1     0     8    0
dma32       32        7    0        7     1     1     0     1     0     8    0
dma16       16       17    0       17     1     1     0     1     0     8    0
aobjpl      64      137    0        8     3     0     3     3     0     8    0
uaddrrnd    24    11570    0    11485     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24    11570    0    11485     1     0     1     1     0     8    0
vmmpekpl   168    87439    0    87393     5     2     3     3     0     8    0
vmmpepl    168  1410162    0  1407441   655   495   160   160     0   357   36
vmsppl     368    11501    0    11485     2     0     2     2     0     8    0
pdppl      4096   23147    0    23057    16     4    12    12     0     8    0
pvpl        32  3174801    0  3154447   554   358   196   227     0   265    0
pmappl     232    11569    0    11504     6     2     4     4     0     8    0
extentpl    40       41    0       26     1     0     1     1     0     8    0
phpool     112      791    0       98    21     1    20    21     0     8    0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/11/07 13:08 openbsd b50d7ae0ca56 efb49b4d .config console log report ci-openbsd-multicore
* Struck through repros no longer work on HEAD.