syzbot


assert "rt->rt_ifa->ifa_ifp != NULL" failed: file "panic: kernel diagnostic assertion "!_kernel_lock_held()" failed in k

Status: closed as dup on 2019/10/21 07:17
Reported-by: syzbot+b0875d3256b7c68aa7ee@syzkaller.appspotmail.com
First crash: 1022d, last: 1022d
Duplicate of (1):
Title Repro Cause bisect Fix bisect Count Last Reported
assert "rt->rt_ifa->ifa_ifp != NULL" failed in route.c 830 1004d 1045d

Sample crash report:
panic: kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: file "panic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 690
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 287033  63720      0           0  0x4000000    0  syz-executor.1
* 55440  48510      0           0  0x4000000    1  syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
__assert(ffffffff82207051,ffffffff821f613e,2b2,ffffffff821d67e2) at __assert+0x2b sys/kern/subr_prf.c:154
proc_trampoline_mp() at proc_trampoline_mp+0x123
end trace frame: 0x0, count: 11
https://www.openbsd.org/ddb.html describes the minimum info required in bug
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ddb{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 848
ddb{1}> 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
__assert(ffffffff82207051,ffffffff821f613e,2b2,ffffffff821d67e2) at __assert+0x2b sys/kern/subr_prf.c:154
proc_trampoline_mp() at proc_trampoline_mp+0x123
end trace frame: 0x0, count: -4
ddb{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800023dc7410
rbx               0xffff800023dc74c0
rdx               0xffff800020ab0c70
rcx                                0
rax                                0
r8                0xffffffff812be63f    kprintf+0x16f
r9                               0x1
r10                             0x25
r11               0xcfbc58d6946af996
r12                     0x3000000008
r13               0xffff800023dc7420
r14                            0x104
r15                              0x1
rip               0xffffffff8101a1f8    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800023dc7400
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.0) pid=55440 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=86, usrpri=86, nice=20
    forw=0xffffffffffffffff, list=0xffff800020ab1b40,0xffff800020a5f8c8
    process=0xffff800020a8b890 user=0xffff800023dc2000, vmspace=0xfffffd807f00bcf0
    estcpu=36, cpticks=1, pctcpu=0.0
    user=0, sys=1, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 63720  521120  21965      0  2           0                syz-executor.1
 63720  287033  21965      0  7   0x4000000                syz-executor.1
 48510  105778  77895      0  2           0                syz-executor.0
 48510  304893  77895      0  3   0x4000080  netcon2       syz-executor.0
*48510   55440  77895      0  7   0x4000000                syz-executor.0
 48510  284609  77895      0  2   0x4000000                syz-executor.0
 77895  477433   6353      0  3        0x82  nanosleep     syz-executor.0
 21965  422675   6353      0  3        0x82  nanosleep     syz-executor.1
 12213   75583      0      0  3     0x14200  acct          acct
 43731  131331      0      0  3     0x14200  bored         sosplice
  6353  131128  43992      0  3        0x82  thrsleep      syz-fuzzer
  6353   53565  43992      0  3   0x4000082  thrsleep      syz-fuzzer
  6353  203083  43992      0  3   0x4000082  thrsleep      syz-fuzzer
  6353  463526  43992      0  3   0x4000082  thrsleep      syz-fuzzer
  6353    5009  43992      0  3   0x4000082  thrsleep      syz-fuzzer
  6353  206143  43992      0  3   0x4000082  kqread        syz-fuzzer
  6353  321407  43992      0  3   0x4000082  thrsleep      syz-fuzzer
  6353  263311  43992      0  3   0x4000082  thrsleep      syz-fuzzer
  6353   56715  43992      0  3   0x4000082  thrsleep      syz-fuzzer
  6353  495158  43992      0  3   0x4000082  thrsleep      syz-fuzzer
 43992  484008  52843      0  3    0x10008a  pause         ksh
 52843  399006  87315      0  3        0x92  select        sshd
 85201  331168      1      0  3    0x100083  ttyin         getty
 87315  330194      1      0  3        0x80  select        sshd
 97832  288650  79538     74  3    0x100092  bpf           pflogd
 79538  406374      1      0  3        0x80  netio         pflogd
 51605  246852  49550     73  3    0x100090  kqread        syslogd
 49550  488146      1      0  3    0x100082  netio         syslogd
 85436  407219      1     77  3    0x100090  poll          dhclient
 23603  515452      1      0  3        0x80  poll          dhclient
 49644  456463      0      0  2     0x14200                zerothread
 78837   17747      0      0  3     0x14200  aiodoned      aiodoned
  2550  239365      0      0  3     0x14200  syncer        update
 35800   70166      0      0  3     0x14200  cleaner       cleaner
 58254  149780      0      0  3     0x14200  reaper        reaper
 64284  130433      0      0  3     0x14200  pgdaemon      pagedaemon
 39027   32759      0      0  3     0x14200  bored         crynlk
 32433  164739      0      0  3     0x14200  bored         crypto
 12224   33641      0      0  3  0x40014200  acpi0         acpi0
 84394  355316      0      0  3  0x40014200                idle1
 29314  267574      0      0  3     0x14200  bored         softnet
 89522  141831      0      0  3     0x14200  bored         systqmp
 81106  265780      0      0  3     0x14200  bored         systq
 78044  160465      0      0  3  0x40014200  bored         softclock
 65652  185248      0      0  3  0x40014200                idle0
  7376  368840      0      0  3     0x14200  bored         smr
     1  473745      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
Process 63720 (syz-executor.1) thread 0xffff800020ab1b40 (287033)
exclusive rwlock netlock r = 0 (0xffffffff824b9ff8)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  solock+0x5a sys/kern/uipc_socket2.c:282
#2  sys_connect+0x6b sys/kern/uipc_syscalls.c:362
#3  syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#3  syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#4  Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82646968)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline]
#1  syscall+0x400 sys/arch/amd64/amd64/trap.c:555
#2  Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim Kern Lim
         devbuf  9594   6453K    7965K  78643K     15474        0        0
            pcb    13     10K      12K  78643K       465        0        0
         rtable   113     13K      15K  78643K      1554        0        0
         ifaddr    86     18K      18K  78643K       464        0        0
       counters    39     33K      33K  78643K        39        0        0
       ioctlops     0      0K       4K  78643K      1563        0        0
            iov     0      0K      24K  78643K       365        0        0
          mount     1      1K       1K  78643K         1        0        0
         vnodes  1227     77K      78K  78643K      3364        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       156        0        0
         VM map     9      4K       5K  78643K        21        0        0
            sem    12      0K       0K  78643K       481        0        0
        dirhash    12      2K       2K  78643K        12        0        0
           ACPI  1808    196K     290K  78643K     12765        0        0
      file desc     6     17K      25K  78643K      2261        0        0
          sigio     0      0K       0K  78643K        30        0        0
           proc    62     63K      95K  78643K      1135        0        0
        subproc    32      2K       2K  78643K       255        0        0
    NFS srvsock     1      0K       0K  78643K         1        0        0
     NFS daemon     1     16K      16K  78643K         1        0        0
    ip_moptions     0      0K       0K  78643K       192        0        0
       in_multi    30      2K       2K  78643K       298        0        0
    ether_multi     1      0K       0K  78643K        31        0        0
            mrt     0      0K       0K  78643K        14        0        0
    ISOFS mount     1     32K      32K  78643K         1        0        0
  MSDOSFS mount     1     16K      16K  78643K         1        0        0
           ttys   150    662K     662K  78643K       150        0        0
           exec     0      0K       1K  78643K       568        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   134     72K      72K  78643K      9423        0        0
       UVM aobj   130      4K       4K  78643K       132        0        0
        memdesc     1      4K       4K  78643K         1        0        0
    crypto data     1      1K       1K  78643K         1        0        0
    ip6_options     0      0K       0K  78643K       508        0        0
            NDP    21      0K       0K  78643K       141        0        0
           temp   228   3557K    3644K  78643K     79822        0        0
         kqueue     0      0K       0K  78643K        10        0        0
      SYN cache     2     16K      16K  78643K         2        0        0
ddb{1}> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp         64       56    0       51     1     0     1     1     0     8    0
plcache    128       20    0        0     1     0     1     1     0     8    0
rtpcb       80      168    0      166     1     0     1     1     0     8    0
rtentry    112      281    0      242     2     0     2     2     0     8    0
unpcb      120     1113    0     1102     2     1     1     2     0     8    0
syncache   264       20    0       20     6     6     0     1     0     8    0
tcpqe       32       48    0       48     5     5     0     1     0     8    0
tcpcb      544     1405    0     1396     2     1     1     2     0     8    0
inpcb      280     3424    0     3412    26    24     2    13     0     8    1
rttmr       72        5    0        4     2     1     1     1     0     8    0
nd6         48       36    0       33     2     1     1     1     0     8    0
pkpcb       40        9    0        9     4     4     0     1     0     8    0
ppxss      1128      58    0       58    13    12     1     1     0     8    1
pffrag     232       71    0       69    11    10     1     1     0   482    0
pffrnode    88       70    0       69    11    10     1     1     0     8    0
pffrent     40     2404    0     2372    10     9     1     1     0     8    0
pfosfp      40      846    0      423     5     0     5     5     0     8    0
pfosfpen   112     1428    0      714    21     0    21    21     0     8    0
pfstitem    24      197    0      164     1     0     1     1     0     8    0
pfstkey    112      197    0      164     2     0     2     2     0     8    0
pfstate    328      197    0      164     5     0     5     5     0     8    0
pfrule     1360      21    0       16     2     1     1     2     0     8    0
art_heap8  4096      15    0       14     7     6     1     3     0     8    0
art_heap4  256     1177    0      953    25     9    16    16     0     8    1
art_table   32     1192    0      967     4     1     3     3     0     8    0
art_node    16      279    0      243     1     0     1     1     0     8    0
sysvmsgpl   40       13    0        7     1     0     1     1     0     8    0
semupl     112        2    0        2     2     2     0     1     0     8    0
semapl     112      477    0      467     1     0     1     1     0     8    0
shmpl      112      130    0        2     4     0     4     4     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino1pl    128     5000    0     3599    46     0    46    46     0     8    0
ffsino     272     5000    0     3599    94     0    94    94     0     8    0
nchpl      144     9762    0     9276    61    41    20    61     0     8    0
uvmvnodes   72     5926    0        0   108     0   108   108     0     8    0
vnodes     208     5926    0        0   312     0   312   312     0     8    0
namei      1024   34753    0    34753     1     0     1     1     0     8    1
percpumem   16       30    0        0     1     0     1     1     0     8    0
vcpupl     1984       7    0        0     1     0     1     1     0     8    0
vmpool     552       19    0       12     1     0     1     1     0     8    0
scsiplug    64        3    0        3     3     3     0     1     0     8    0
scxspl     192    25478    0    25478    24    23     1     7     0     8    1
plimitpl   152      189    0      181     1     0     1     1     0     8    0
sigapl     432     2422    0     2406     3     1     2     3     0     8    0
futexpl     56    53773    0    53773     1     0     1     1     0     8    1
knotepl    112      612    0      593     3     2     1     2     0     8    0
kqueuepl   104      549    0      547     2     1     1     2     0     8    0
pipepl     112     1344    0     1325     5     4     1     2     0     8    0
fdescpl    488     2423    0     2406     3     0     3     3     0     8    0
filepl     152    24383    0    24280    28    23     5    14     0     8    0
lockfpl    104      626    0      625     1     0     1     1     0     8    0
lockfspl    48      224    0      223     1     0     1     1     0     8    0
sessionpl  112       31    0       20     1     0     1     1     0     8    0
pgrppl      48       49    0       38     1     0     1     1     0     8    0
ucredpl     96     6881    0     6872     1     0     1     1     0     8    0
zombiepl   144     2406    0     2406     1     0     1     1     0     8    1
processpl  896     2440    0     2406     4     0     4     4     0     8    0
procpl     632     7967    0     7920     6     1     5     5     0     8    1
srpgc       64       21    0       21     8     8     0     1     0     8    0
sosppl     128       44    0       43     8     7     1     1     0     8    0
sockpl     384     4758    0     4733    34    30     4    21     0     8    1
mcl64k     65536    266    0        0    34    14    20    34     0     8    1
mcl16k     16384     17    0        0     3     0     3     3     0     8    1
mcl12k     12288     18    0        0     2     0     2     2     0     8    0
mcl9k      9216      11    0        0     1     0     1     1     0     8    0
mcl8k      8192      17    0        0     3     0     3     3     0     8    0
mcl4k      4096      17    0        0     3     0     3     3     0     8    0
mcl2k2     2112       5    0        0     1     0     1     1     0     8    0
mcl2k      2048     172    0        0    21     1    20    21     0     8    0
mtagpl      80       44    0        0     1     0     1     1     0     8    0
mbufpl     256      956    0        0    49     1    48    48     0     8    0
bufpl      256    12296    0     5248   441     0   441   441     0     8    0
anonpl      16   289797    0   270851   177    99    78    93     0   124    0
amapchunkpl 152   18184    0    18067    46    40     6    13     0   158    0
amappl16   192    13309    0    12231   147    91    56    67     0     8    0
amappl15   184       80    0       77     1     0     1     1     0     8    0
amappl14   176      559    0      555     1     0     1     1     0     8    0
amappl13   168      455    0      455     3     3     0     1     0     8    0
amappl12   160      212    0      208     2     1     1     1     0     8    0
amappl11   152      266    0      250     1     0     1     1     0     8    0
amappl10   144      701    0      695     1     0     1     1     0     8    0
amappl9    136      804    0      798     1     0     1     1     0     8    0
amappl8    128      366    0      322     2     0     2     2     0     8    0
amappl7    120      794    0      785     1     0     1     1     0     8    0
amappl6    112      259    0      250     1     0     1     1     0     8    0
amappl5    104      472    0      456     1     0     1     1     0     8    0
amappl4     96     2442    0     2407     1     0     1     1     0     8    0
amappl3     88     1324    0     1317     1     0     1     1     0     8    0
amappl2     80    17949    0    17866     3     1     2     3     0     8    0
amappl1     72    64399    0    63939    25    15    10    20     0     8    0
amappl      80     8467    0     8421     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      131    0        2     3     0     3     3     0     8    0
uaddrrnd    24     2442    0     2406     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24     2442    0     2406     1     0     1     1     0     8    0
vmmpekpl   168    24662    0    24625     3     1     2     2     0     8    0
vmmpepl    168   316046    0   313673   320   193   127   144     0   357   21
vmsppl     368     2422    0     2406     2     0     2     2     0     8    0
pdppl      4096    4891    0     4843     8     1     7     7     0     8    0
pvpl        32   800855    0   779106   350   168   182   218     0   265    1
pmappl     232     2441    0     2418     3     1     2     2     0     8    0
extentpl    40       41    0       26     1     0     1     1     0     8    0
phpool     112      700    0       36    20     0    20    20     0     8    0

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-openbsd-multicore 2019/10/21 03:31 openbsd 29c780a82ed4 8c88c9c1 .config log report