syzbot


assert "rt->rt_ifa->ifa_ifp != NULL" failed: file "/syzkaller/managers/multpanic: kernel diagnostic assertion "!_kernel_

Status: closed as dup on 2019/10/14 19:35
Reported-by: syzbot+7d36a2f77e5565c88505@syzkaller.appspotmail.com
First crash: 1029d, last: 1029d
Duplicate of (1):
Title Repro Cause bisect Fix bisect Count Last Reported
assert "rt->rt_ifa->ifa_ifp != NULL" failed in route.c 830 1005d 1046d

Sample crash report:
panic: kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: file "/syzkaller/managers/multpanic: 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
 255869  71971      0           0  0x4000000    0  syz-executor.0
*266095  71971      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(ffffffff82207fa4,ffffffff821f6416,2b2,ffffffff821d8bbd) 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
reports.  Insufficient info makes it difficult to find and fix bugs.
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(ffffffff82207fa4,ffffffff821f6416,2b2,ffffffff821d8bbd) 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               0xffff800021963870
rbx               0xffff800021963920
rdx               0xffff800020ace510
rcx                                0
rax                                0
r8                0xffffffff821395ef    kprintf+0x16f
r9                               0x1
r10                             0x25
r11               0xa26507f901389220
r12                     0x3000000008
r13               0xffff800021963880
r14                            0x104
r15                              0x1
rip               0xffffffff816aed08    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800021963860
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.0) pid=266095 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=82, usrpri=82, nice=20
    forw=0xffffffffffffffff, list=0xffff800020aceef0,0xffffffff8266fc68
    process=0xffff800020addc00 user=0xffff80002195e000, vmspace=0xfffffd807f00b450
    estcpu=32, cpticks=1, pctcpu=0.0
    user=0, sys=1, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 71971   23856  45385      0  2           0                syz-executor.0
 71971  255869  45385      0  7   0x4000000                syz-executor.0
 71971    4696  45385      0  2   0x4000000                syz-executor.0
*71971  266095  45385      0  7   0x4000000                syz-executor.0
 59197  241497  94450      0  2           0                syz-executor.1
 59197  495961  94450      0  3   0x4000000  physio        syz-executor.1
 45385  166317  38585      0  3        0x82  nanosleep     syz-executor.0
 94450  131572  38585      0  3        0x82  nanosleep     syz-executor.1
 56982  107485      0      0  3     0x14200  acct          acct
 53114  426434      1      0  3    0x100083  ttyin         getty
 62536  381299      0      0  3     0x14200  bored         sosplice
 38585  259705  87945      0  3        0x82  thrsleep      syz-fuzzer
 38585  194573  87945      0  3   0x4000082  nanosleep     syz-fuzzer
 38585   99304  87945      0  3   0x4000082  thrsleep      syz-fuzzer
 38585  463224  87945      0  3   0x4000082  kqread        syz-fuzzer
 38585  191779  87945      0  3   0x4000082  thrsleep      syz-fuzzer
 38585  508797  87945      0  3   0x4000082  thrsleep      syz-fuzzer
 38585  144319  87945      0  3   0x4000082  thrsleep      syz-fuzzer
 38585   89298  87945      0  3   0x4000082  thrsleep      syz-fuzzer
 38585  302197  87945      0  3   0x4000082  thrsleep      syz-fuzzer
 38585  367331  87945      0  3   0x4000082  thrsleep      syz-fuzzer
 87945  213401  36780      0  3    0x10008a  pause         ksh
 36780  255434  19519      0  3        0x92  select        sshd
 19519  348526      1      0  3        0x80  select        sshd
 45887  357632  33501     74  3    0x100092  bpf           pflogd
 33501  188769      1      0  3        0x80  netio         pflogd
 55969  159408  48767     73  3    0x100090  kqread        syslogd
 48767  442169      1      0  3    0x100082  netio         syslogd
 84060  152310      1     77  3    0x100090  poll          dhclient
 13646   95792      1      0  3        0x80  poll          dhclient
  2508  304008      0      0  2     0x14200                zerothread
 27984  182095      0      0  3     0x14200  aiodoned      aiodoned
 72651  440669      0      0  3     0x14200  syncer        update
 65112  372574      0      0  3     0x14200  cleaner       cleaner
  7410  453901      0      0  3     0x14200  reaper        reaper
 82761  227394      0      0  3     0x14200  pgdaemon      pagedaemon
 25005  330267      0      0  3     0x14200  bored         crynlk
 25167  185368      0      0  3     0x14200  bored         crypto
 24009  378821      0      0  3  0x40014200  acpi0         acpi0
 37866    3362      0      0  3  0x40014200                idle1
 30425  138079      0      0  3     0x14200  bored         softnet
 77207  330469      0      0  3     0x14200  bored         systqmp
 47659  113576      0      0  3     0x14200  bored         systq
 19189     750      0      0  3  0x40014200  bored         softclock
 33582  511342      0      0  3  0x40014200                idle0
 67506  478350      0      0  3     0x14200  bored         smr
     1  420900      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
Process 71971 (syz-executor.0) thread 0xffff800020acfb48 (255869)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82640b98)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  rt_clone+0x5c sys/net/route.c:266
#2  rtalloc_mpath+0xba rt_match sys/net/route.c:244 [inline]
#2  rtalloc_mpath+0xba sys/net/route.c:359
#3  ip_output+0x4f2 sys/netinet/ip_output.c:204
#4  rip_output+0x252 sys/netinet/raw_ip.c:289
#5  rip_usrreq+0x46a sys/netinet/raw_ip.c:538
#6  sosend+0x645 sys/kern/uipc_socket.c:524
#7  dofilewritev+0x1b7 sys/kern/sys_generic.c:364
#8  sys_write+0x83 sys/kern/sys_generic.c:284
#9  syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#9  syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#10 Xsyscall+0x128
exclusive rwlock netlock r = 0 (0xffffffff82486268)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  solock+0x5a sys/kern/uipc_socket2.c:282
#2  sosend+0x51b sys/kern/uipc_socket.c:512
#3  dofilewritev+0x1b7 sys/kern/sys_generic.c:364
#4  sys_write+0x83 sys/kern/sys_generic.c:284
#5  syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5  syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#6  Xsyscall+0x128
Process 59197 (syz-executor.1) thread 0xffff800020acf8d0 (495961)
shared rwlock vmmaplk r = 0 (0xfffffd807f00b748)
#0  witness_lock+0x52e sys/kern/subr_witness.c:1163
#1  uvm_vslock_device+0x11e sys/uvm/uvm_glue.c:174
#2  physio+0x26a sys/kern/kern_physio.c:139
#3  spec_read+0xf1 sys/kern/spec_vnops.c:223
#4  VOP_READ+0xbf sys/kern/vfs_vops.c:248
#5  vn_read+0x124 sys/kern/vfs_vnops.c:378
#6  dofilereadv+0x1a2 sys/kern/sys_generic.c:236
#7  sys_preadv+0xb8 sys/kern/vfs_syscalls.c:3207
#8  syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#8  syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#9  Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim Kern Lim
         devbuf  9566   6441K    8893K  78643K     19418        0        0
            pcb    13     10K      12K  78643K       296        0        0
         rtable   122      9K       9K  78643K      1312        0        0
         ifaddr    77     17K      17K  78643K       387        0        0
       counters    39     33K      33K  78643K        39        0        0
       ioctlops     0      0K       4K  78643K      1536        0        0
            iov     0      0K      32K  78643K       234        0        0
          mount     1      1K       1K  78643K         1        0        0
         vnodes  1233     77K      78K  78643K      3866        0        0
      UFS quota     1     32K      32K  78643K         1        0        0
      UFS mount     5     36K      36K  78643K         5        0        0
            shm     2      1K       5K  78643K        24        0        0
         VM map     5      2K       3K  78643K        12        0        0
            sem    12      0K       0K  78643K       640        0        0
        dirhash    12      2K       2K  78643K        12        0        0
           ACPI  1808    196K     290K  78643K     12765        0        0
      file desc     6     17K      25K  78643K      1370        0        0
          sigio     0      0K       0K  78643K        23        0        0
           proc    61     63K      83K  78643K       848        0        0
        subproc    32      2K       2K  78643K       153        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       105        0        0
       in_multi    34      2K       2K  78643K       217        0        0
    ether_multi     1      0K       0K  78643K        13        0        0
            mrt     0      0K       0K  78643K         5        0        0
    ISOFS mount     1     32K      32K  78643K         1        0        0
  MSDOSFS mount     1     16K      16K  78643K         1        0        0
           ttys    72    318K     318K  78643K        72        0        0
           exec     0      0K       1K  78643K       462        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   129     55K      71K  78643K      5832        0        0
       UVM aobj    69      4K       4K  78643K        79        0        0
        memdesc     1      4K       4K  78643K         1        0        0
    crypto data     1      1K       1K  78643K         1        0        0
    ip6_options     0      0K       1K  78643K       319        0        0
            NDP    17      0K       0K  78643K       126        0        0
           temp   207   3560K    3628K  78643K     24063        0        0
         kqueue     0      0K       0K  78643K         5        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       48    0       41     1     0     1     1     0     8    0
plcache    128       20    0        0     1     0     1     1     0     8    0
rtpcb       80      128    0      126     1     0     1     1     0     8    0
rtentry    112      229    0      181     2     0     2     2     0     8    0
unpcb      120      665    0      655     1     0     1     1     0     8    0
syncache   264        4    0        4     1     1     0     1     0     8    0
tcpqe       32       11    0       11     1     1     0     1     0     8    0
tcpcb      544     1134    0     1130    27    26     1    12     0     8    0
inpcb      280     3153    0     3143    19    17     2     9     0     8    1
rttmr       72        2    0        2     1     1     0     1     0     8    0
nd6         48       30    0       26     1     0     1     1     0     8    0
pkpcb       40       10    0       10     2     2     0     1     0     8    0
ppxss      1128      48    0       48     5     4     1     1     0     8    1
pffrag     232       49    0       49     3     2     1     1     0   482    1
pffrnode    88       49    0       49     3     2     1     1     0     8    1
pffrent     40     1385    0     1385     3     2     1     1     0     8    1
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      145    0       75     1     0     1     1     0     8    0
pfstkey    112      148    0       78     3     0     3     3     0     8    0
pfstate    328      148    0       78     7     0     7     7     0     8    0
pfrule     1360      21    0       16     2     1     1     2     0     8    0
art_heap8  4096       2    0        1     2     1     1     2     0     8    0
art_heap4  256      977    0      743    19     3    16    16     0     8    0
art_table   32      979    0      744     2     0     2     2     0     8    0
art_node    16      228    0      184     1     0     1     1     0     8    0
sysvmsgpl   40       34    0       17     1     0     1     1     0     8    0
semapl     112      638    0      628     1     0     1     1     0     8    0
shmpl      112       77    0       10     2     0     2     2     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino1pl    128     3537    0     2124    46     0    46    46     0     8    0
ffsino     272     3537    0     2124    95     0    95    95     0     8    0
nchpl      144     6016    0     5549    61    41    20    61     0     8    0
uvmvnodes   72     5870    0        0   107     0   107   107     0     8    0
vnodes     208     5870    0        0   309     0   309   309     0     8    0
namei      1024   20504    0    20504     1     0     1     1     0     8    1
percpumem   16       30    0        0     1     0     1     1     0     8    0
vcpupl     1984       3    0        0     1     0     1     1     0     8    0
vmpool     552       10    0        7     1     0     1     1     0     8    0
scsiplug    64        2    0        2     2     2     0     1     0     8    0
scxspl     192    19267    0    19266    14    13     1     7     0     8    0
plimitpl   152      131    0      123     1     0     1     1     0     8    0
sigapl     432     1550    0     1534     3     1     2     3     0     8    0
futexpl     56    34293    0    34293     1     0     1     1     0     8    1
knotepl    112      340    0      321     1     0     1     1     0     8    0
kqueuepl   104      625    0      623     7     6     1     4     0     8    0
pipepl     112     1028    0     1009     4     3     1     2     0     8    0
fdescpl    488     1551    0     1534     3     0     3     3     0     8    0
filepl     152    14370    0    14265    25    19     6    14     0     8    1
lockfpl    104      489    0      488     1     0     1     1     0     8    0
lockfspl    48      162    0      161     1     0     1     1     0     8    0
sessionpl  112       26    0       15     1     0     1     1     0     8    0
pgrppl      48       47    0       36     1     0     1     1     0     8    0
ucredpl     96     1216    0     1207     1     0     1     1     0     8    0
zombiepl   144     1535    0     1535     1     0     1     1     0     8    1
processpl  896     1569    0     1535     4     0     4     4     0     8    0
procpl     632     4655    0     4608     5     0     5     5     0     8    0
srpgc       64        8    0        8     3     2     1     1     0     8    1
sosppl     128        9    0        9     4     3     1     1     0     8    1
sockpl     384     3982    0     3960    30    26     4    14     0     8    1
mcl64k     65536     27    0        0     3     0     3     3     0     8    0
mcl16k     16384      7    0        0     1     0     1     1     0     8    0
mcl12k     12288     17    0        0     2     0     2     2     0     8    0
mcl9k      9216       9    0        0     1     0     1     1     0     8    0
mcl8k      8192      14    0        0     2     0     2     2     0     8    0
mcl4k      4096      16    0        0     2     0     2     2     0     8    0
mcl2k2     2112       3    0        0     1     0     1     1     0     8    0
mcl2k      2048     165    0        0    20     1    19    20     0     8    0
mtagpl      80       27    0        0     1     0     1     1     0     8    0
mbufpl     256      516    0        0    30     0    30    30     0     8    0
bufpl      256    10520    0     3471   441     0   441   441     0     8    0
anonpl      16   182262    0   167471   121    29    92    93     0   124   15
amapchunkpl 152   11135    0    10993    31    24     7    14     0   158    1
amappl16   192     8011    0     6979    96    37    59    64     0     8    7
amappl14   176      696    0      692     1     0     1     1     0     8    0
amappl13   168       70    0       70     1     1     0     1     0     8    0
amappl12   160      240    0      240     2     1     1     1     0     8    1
amappl11   152      321    0      306     1     0     1     1     0     8    0
amappl10   144       25    0       18     1     0     1     1     0     8    0
amappl9    136      793    0      783     1     0     1     1     0     8    0
amappl8    128      379    0      339     2     0     2     2     0     8    0
amappl7    120       76    0       66     1     0     1     1     0     8    0
amappl6    112      319    0      309     1     0     1     1     0     8    0
amappl5    104      435    0      421     1     0     1     1     0     8    0
amappl4     96     1575    0     1542     1     0     1     1     0     8    0
amappl3     88     1023    0     1017     1     0     1     1     0     8    0
amappl2     80    11116    0    11034     3     1     2     3     0     8    0
amappl1     72    44550    0    44086    26    16    10    20     0     8    0
amappl      80     5050    0     5001     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       78    0       10     2     0     2     2     0     8    0
uaddrrnd    24     1561    0     1534     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24     1561    0     1534     1     0     1     1     0     8    0
vmmpekpl   168    16679    0    16644     2     0     2     2     0     8    0
vmmpepl    168   204529    0   202224   191    56   135   135     0   357   31
vmsppl     368     1550    0     1534     2     0     2     2     0     8    0
pdppl      4096    3129    0     3085     6     0     6     6     0     8    0
pvpl        32   541264    0   523431   258    44   214   217     0   265   37
pmappl     232     1560    0     1541     3     1     2     2     0     8    0
extentpl    40       41    0       26     1     0     1     1     0     8    0
phpool     112      658    0       34    18     0    18    18     0     8    0

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-openbsd-multicore 2019/10/14 19:31 openbsd 0bd8f65804ca a6aef847 .config log report