syzbot


assert "ps->ps_uvncount == NUM" failed in kern_unveil.c (2)

Status: upstream: reported on 2022/05/19 18:02
Reported-by: syzbot+27102d4b18b9ff02cffd@syzkaller.appspotmail.com
First crash: 263d, last: 53d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd assert "ps->ps_uvncount == NUM" failed in kern_unveil.c 2 394d 406d 0/3 auto-closed as invalid on 2022/04/09 05:58

Sample crash report:
panic: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 188
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff825a9d3c) at panic+0x177 sys/kern/subr_prf.c:198
__assert(ffffffff82623463,ffffffff82627923,bc,ffffffff825c4496) at __assert+0x25 sys/kern/subr_prf.c:157
unveil_destroy(ffff8000ffff25c8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188
exit1(ffff80002e6d6000,0,0,1) at exit1+0x3d5 sys/kern/kern_exit.c:219
sys_exit(ffff80002e6d6000,ffff800027c006a0,ffff800027c006f0) at sys_exit+0x16 sys/kern/kern_exit.c:89
syscall(ffff800027c00770) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800027c00770) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffb7d0, count: 7
https://www.openbsd.org/ddb.html describes the minimum info required in bug
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ddb{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 188
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff825a9d3c) at panic+0x177 sys/kern/subr_prf.c:198
__assert(ffffffff82623463,ffffffff82627923,bc,ffffffff825c4496) at __assert+0x25 sys/kern/subr_prf.c:157
unveil_destroy(ffff8000ffff25c8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188
exit1(ffff80002e6d6000,0,0,1) at exit1+0x3d5 sys/kern/kern_exit.c:219
sys_exit(ffff80002e6d6000,ffff800027c006a0,ffff800027c006f0) at sys_exit+0x16 sys/kern/kern_exit.c:89
syscall(ffff800027c00770) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800027c00770) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffb7d0, count: -8
ddb{0}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800027c004b0
rbx               0xffffffff82952b8f    cpu_info_full_primary+0x2b8f
rdx                                0
rcx                                0
rax               0xffff80002e6d6000
r8                 0x101010101010101
r9                0x8080808080808080
r10               0xea3ca00f939dece1
r11               0xc4fffde950d9a900
r12               0xffffffff82952990    cpu_info_full_primary+0x2990
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff8157f0e8    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800027c004a0
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.4) pid=345886 stat=onproc
    flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
    pri=32, usrpri=86, nice=20
    forw=0xffffffffffffffff, list=0xffff80002e6d67e0,0xffff800021324fd0
    process=0xffff8000ffff25c8 user=0xffff800027bfb000, vmspace=0xfffffd807640c178
    estcpu=36, cpticks=13, pctcpu=0.4
    user=0, sys=2, intr=0
ddb{0}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 34036   53842  68062      0  2       0x480                syz-executor.7
 34036  325038  68062      0  3   0x4000080  netcon        syz-executor.7
 34036  352830  68062      0  3   0x4000080  fsleep        syz-executor.7
 74019   56082  10701      0  3        0x80  nanoslp       syz-executor.3
 74019  272791  10701      0  3   0x4000080  netcon        syz-executor.3
 74019   17643  10701      0  3   0x4000080  fsleep        syz-executor.3
 10620  439723  60483      0  3        0x80  nanoslp       syz-executor.5
 10620  454243  60483      0  3   0x4000080  netcon        syz-executor.5
 10620  269002  60483      0  3   0x4000080  fsleep        syz-executor.5
 10620  110854  60483      0  3   0x4000080  fsleep        syz-executor.5
 41576  138087  53070      0  3        0x82  nanoslp       syz-executor.6
 89378  424268  53070      0  3        0x82  nanoslp       syz-executor.4
 34945  388027  53070      0  3        0x82  piperd        syz-executor.2
 83177  493318  53070      0  2         0x2                syz-executor.1
 10701  299417  53070      0  3        0x82  nanoslp       syz-executor.3
 60483   12447  53070      0  3        0x82  nanoslp       syz-executor.5
 68062    2293  53070      0  3        0x82  nanoslp       syz-executor.7
 66586  502922      1      0  3    0x100083  ttyopn        getty
 18183   18074  53070      0  3        0x82  piperd        syz-executor.0
  7908  318831      0      0  3     0x14200  acct          acct
 70317  190162      0      0  3     0x14280  nfsidl        nfsio
 78318  167174      0      0  3     0x14280  nfsidl        nfsio
 73117   94620      0      0  3     0x14280  nfsidl        nfsio
 10850  366966      0      0  3     0x14280  nfsidl        nfsio
 17515  230367      0      0  3     0x14280  nfsidl        nfsio
  3932  508572      0      0  3     0x14280  nfsidl        nfsio
 89679  169657      0      0  3     0x14280  nfsidl        nfsio
 81365  293729      0      0  3     0x14280  nfsidl        nfsio
 73342  435938      0      0  3     0x14280  nfsidl        nfsio
  7098  401995      0      0  3     0x14280  nfsidl        nfsio
  6394  264016      0      0  3     0x14280  nfsidl        nfsio
 39197  320840      0      0  3     0x14280  nfsidl        nfsio
 61778  454290      0      0  3     0x14280  nfsidl        nfsio
 82420  480015      0      0  3     0x14280  nfsidl        nfsio
 93333  502247      0      0  3     0x14280  nfsidl        nfsio
 76357   95772      0      0  3     0x14280  nfsidl        nfsio
 46777   98899      0      0  3     0x14280  nfsidl        nfsio
 49801   37045      0      0  3     0x14280  nfsidl        nfsio
 20615  490816      0      0  3     0x14280  nfsidl        nfsio
 22704   77567      0      0  3     0x14280  nfsidl        nfsio
 72225  108244      0      0  3     0x14200  bored         sosplice
 53070  480075  40818      0  3        0x82  thrsleep      syz-fuzzer
 53070  138438  40818      0  2   0x4000482                syz-fuzzer
 53070  190888  40818      0  3   0x4000082  thrsleep      syz-fuzzer
 53070  284562  40818      0  3   0x4000082  thrsleep      syz-fuzzer
 53070  134511  40818      0  3   0x4000082  wait          syz-fuzzer
 53070  213122  40818      0  3   0x4000082  thrsleep      syz-fuzzer
 53070  290447  40818      0  3   0x4000082  kqread        syz-fuzzer
 53070   13768  40818      0  3   0x4000082  wait          syz-fuzzer
 53070   98340  40818      0  3   0x4000082  thrsleep      syz-fuzzer
 53070  288316  40818      0  3   0x4000082  wait          syz-fuzzer
 53070  238606  40818      0  3   0x4000082  wait          syz-fuzzer
 53070  321851  40818      0  3   0x4000082  wait          syz-fuzzer
 53070   78416  40818      0  3   0x4000082  wait          syz-fuzzer
 53070   55070  40818      0  3   0x4000082  wait          syz-fuzzer
 53070   67312  40818      0  3   0x4000082  thrsleep      syz-fuzzer
 53070  470664  40818      0  3   0x4000082  wait          syz-fuzzer
 40818  369521  91647      0  3    0x10008a  sigsusp       ksh
 91647  491915  66034      0  3        0x9a  kqread        sshd
 66034  396920      1      0  3        0x88  kqread        sshd
  1127  392353  56750     74  3   0x1100092  bpf           pflogd
 56750  413878      1      0  3        0x80  netio         pflogd
 57336  253882  49704     73  3   0x1100090  kqread        syslogd
 49704  271544      1      0  3    0x100082  netio         syslogd
 13726  112679      1      0  3    0x100080  kqread        resolvd
 15100  183778      0      0  3     0x14200  bored         smr
 96591  336744      0      0  2     0x14200                zerothread
 77696  513630      0      0  3     0x14200  aiodoned      aiodoned
 51155  151043      0      0  3     0x14200  syncer        update
 83624   31886      0      0  3     0x14200  cleaner       cleaner
 53772  277337      0      0  2     0x14200                reaper
 71837  229440      0      0  3     0x14200  pgdaemon      pagedaemon
 53266   17719      0      0  3     0x14200  bored         viomb
 91209  131505      0      0  3  0x40014200  acpi0         acpi0
 24579  444857      0      0  7  0x40014200                idle1
 48734  210787      0      0  3     0x14200  bored         softnet
 60228  244641      0      0  3     0x14200  bored         softnet
  8577  421068      0      0  3     0x14200  bored         softnet
 80053    7700      0      0  3     0x14200  bored         softnet
  6056  442715      0      0  3     0x14200  bored         systqmp
 48607   59177      0      0  3     0x14200  bored         systq
 87472  497376      0      0  3  0x40014200  bored         softclock
 42403  501392      0      0  3  0x40014200                idle0
     1  137444      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{0}> show all locks
ddb{0}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10229   6570K    6669K  78643K     12629        0
            pcb    13     16K      19K  78643K      1640        0
         rtable   217     16K      16K  78643K      1586        0
         ifaddr    87     19K      20K  78643K       579        0
         sysctl     3      1K       1K  78643K         5        0
       counters    58     35K      36K  78643K       478        0
       ioctlops     0      0K       4K  78643K      2262        0
            iov     0      0K      28K  78643K      1925        0
          mount     1      1K       1K  78643K         1        0
            log     0      0K       0K  78643K         4        0
         vnodes  1337     84K      84K  78643K      3328        0
      UFS quota     1     32K      32K  78643K         1        0
      UFS mount     5     36K      36K  78643K         5        0
            shm     3      5K      13K  78643K       106        0
         VM map     2      1K       1K  78643K         2        0
            sem     9      3K       5K  78643K        20        0
        dirhash    12      2K       2K  78643K        12        0
           ACPI  1697    195K     286K  78643K     12548        0
      file desc    13     45K      85K  78643K      5934        0
          sigio     0      0K       0K  78643K       177        0
           proc    68     91K     128K  78643K      1585        0
        subproc   104      6K       6K  78643K       468        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
    ip_moptions     0      0K       0K  78643K       504        0
       in_multi    88      5K       6K  78643K       564        0
    ether_multi     1      0K       0K  78643K        22        0
            mrt     1      0K       0K  78643K        18        0
    ISOFS mount     1     32K      32K  78643K         1        0
  MSDOSFS mount     1     16K      16K  78643K         1        0
           ttys   199    890K     890K  78643K       199        0
           exec     0      0K       1K  78643K      1275        0
            tdb     3      0K       0K  78643K         3        0
        pagedep     1      8K       8K  78643K         1        0
       inodedep     1     32K      32K  78643K         1        0
         newblk     1      0K       0K  78643K         1        0
        VM swap     8     62K      64K  78643K        10        0
       UVM amap   425    530K     531K  78643K     42392        0
       UVM aobj   131      4K       4K  78643K       131        0
        memdesc     1      4K       4K  78643K         1        0
    crypto data     1      1K       1K  78643K         1        0
    ip6_options     0      0K       0K  78643K       196        0
            NDP    15      0K       2K  78643K       195        0
           temp   147   4698K   70230K  78643K    123371        0
         kqueue     6     10K      26K  78643K       717        0
      SYN cache     2     16K      16K  78643K         2        0
ddb{0}> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache    128       22    0        0     1     0     1     1     0     8    0
rtpcb      120      385    0      384     5     4     1     3     0     8    0
rtentry    112      538    0      446     4     1     3     4     0     8    0
unpcb      144     5460    0     5450    61    60     1     6     0     8    0
syncache   296       47    0       47    10     9     1     1     0     8    1
tcpqe       32       76    0       76     6     5     1     1     0     8    1
tcpcb      776     7829    0     7820   107    99     8    18     0     8    6
arp        120       76    0       60     1     0     1     1     0     8    0
inpcb      368    12052    0    12043   119   111     8    22     0     8    6
nd6         48      117    0       96     1     0     1     1     0     8    0
kcovpl      48       36    0       28     1     0     1     1     0     8    0
mppekey    1024       3    0        3     1     1     0     1     0     8    0
ppxss      1256     150    0      150    13    12     1     1     0     8    1
pppxif     1448      28    0       28    10    10     0     1     0     8    0
pfstscr     40       46    0       45     2     1     1     1     0     8    0
pffrag     232       70    0       70     1     1     0     1     0   482    0
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pffrent     40      143    0      143     1     1     0     1     0     8    0
pfosfp      40     1431    0     1007     5     0     5     5     0     8    0
pfosfpen   112     1431    0      716    21     0    21    21     0     8    0
pfanchor   1280     904   18      392    47     4    43    43     0     8    0
pfstitem    24      106    0      102     1     0     1     1     0     8    0
pfstkey    120      196    0      192     2     1     1     2     0     8    0
pfstate    384      150    0      147     5     4     1     4     0     8    0
pfrule     1344      21    0       20     2     1     1     2     0     8    0
rttmr      136        7    0        7     2     2     0     1     0     8    0
art_heap8  4096      12    0       11    10     9     1     3     0     8    0
art_heap4  256     2585    0     2178    43    17    26    29     0     8    0
art_table   32     2597    0     2189     4     0     4     4     0     8    0
art_node    16      537    0      457     1     0     1     1     0     8    0
sysvmsgpl   40       17    0       15     4     3     1     1     0     8    0
semupl     112        5    0        5     1     1     0     1     0     8    0
semapl     112        7    0        0     1     0     1     1     0     8    0
shmpl      112      128    0        0     4     0     4     4     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     9029    0     7558    93     0    93    93     0     8    0
ffsino     272     9029    0     7558    99     0    99    99     0     8    0
nchpl      144    17229    0    15583    63     0    63    63     0     8    0
uvmvnodes   80     5926    0        0   121     0   121   121     0     8    0
vnodes     216     5926    0        0   330     0   330   330     0     8    0
namei      1024   66277    0    66277     3     1     2     2     0     8    2
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vcpupl     2048     126    0        0    16     0    16    16     0     8    0
vmpool     568      150    0       24    10     1     9     9     0     8    0
kstatmem   264      236    0      206     6     3     3     3     0     8    0
scsiplug    72        3    0        3     1     1     0     1     0     8    0
scxspl     216    48212    0    48212    13    12     1     8     0     8    1
plimitpl   152     1192    0     1177     1     0     1     1     0     8    0
sigapl     424     6217    0     6153     9     1     8     8     0     8    0
futexpl     64    65023    0    65019     2     1     1     1     0     8    0
knotepl    120      571    0        0    10     0    10    10     0     8    0
kqueuepl   216     1457    0     1452    22    21     1     6     0     8    0
pipepl     320     1845    0     1817    58    55     3    11     0     8    0
fdescpl    496     6178    0     6155     6     2     4     5     0     8    0
filepl     152    50589    0    50356    92    77    15    24     0     8    3
lockfpl    104     2961    0     2959     5     3     2     2     0     8    1
lockfspl    48      628    0      626     1     0     1     1     0     8    0
sessionpl  144       53    0       37     1     0     1     1     0     8    0
pgrppl      48       75    0       59     1     0     1     1     0     8    0
ucredpl    104     6669    0     6660     1     0     1     1     0     8    0
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processpl  1072    6217    0     6153     5     0     5     5     0     8    0
procpl     672    16796    0    16709    19    10     9    10     0     8    0
srpgc       96       32    0       32    11    11     0     1     0     8    0
sosppl     168       67    0       67    10     9     1     1     0     8    1
sockpl     488    17897    0    17877   339   328    11    40     0     8    8
mcl64k     65536      6    0        0     1     0     1     1     0     8    0
mcl16k     16384      5    0        0     1     0     1     1     0     8    0
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mcl9k      9216       5    0        0     1     0     1     1     0     8    0
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mcl4k      4096      17    0        0     3     0     3     3     0     8    0
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mcl2k      2048     515    0        0    64     3    61    64     0     8    0
mtagpl      96       18    0        0     1     0     1     1     0     8    0
mbufpl     256     1043    0        0    54     0    54    54     0     8    0
bufpl      288    12881    0     6549   453     0   453   453     0     8    0
anonpl      24  1271441    0  1254687   161    42   119   133     0   186    0
amapchunkpl 152  118670    0   117896    57    23    34    41     0   158    0
amappl16   200    12111    0    11557   100    68    32    45     0     8    0
amappl15   192       23    0       22     1     0     1     1     0     8    0
amappl14   184      230    0      220     2     0     2     2     0     8    0
amappl13   176       10    0       10     2     2     0     1     0     8    0
amappl12   168      760    0      757     1     0     1     1     0     8    0
amappl11   160       60    0       51     1     0     1     1     0     8    0
amappl10   152       88    0       76     1     0     1     1     0     8    0
amappl9    144      986    0      985     3     2     1     1     0     8    0
amappl8    136      402    0      302     4     0     4     4     0     8    0
amappl7    128      230    0      204     2     0     2     2     0     8    0
amappl6    120      333    0      317     3     2     1     3     0     8    0
amappl5    112      296    0      290     1     0     1     1     0     8    0
amappl4    104      796    0      764     2     1     1     2     0     8    0
amappl3     96    17890    0    17842     2     0     2     2     0     8    0
amappl2     88     6941    0     6878     3     1     2     3     0     8    0
amappl1     80   143491    0   142843    24     8    16    23     0     8    0
amappl      88    41372    0    41144     8     2     6     7     0    92    0
dma4096    4096       1    0        1     1     1     0     1     0     8    0
dma1024    1024       1    0        0     1     0     1     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       18    0       17     1     0     1     1     0     8    0
aobjpl      72      130    0        0     3     0     3     3     0     8    0
uaddrrnd    24     6328    0     6178     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24     6328    0     6178     1     0     1     1     0     8    0
vmmpekpl   168    51916    0    51836     4     0     4     4     0     8    0
vmmpepl    168   578751    0   575994   296   154   142   162     0   357    3
vmsppl     368     6327    0     6178    15     1    14    14     0     8    0
rwobjpl     56   158621    0   150886   122    11   111   114     0     8    0
pdppl      4096   12663    0    12482   424   235   189   190     0     8    8
pvpl        32  2473295    0  2451294   353   154   199   275     0   265    0
pmappl     248     6327    0     6178    11     1    10    10     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112     1421    0      392    30     0    30    30     0     8    0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff825a9d3c) at panic+0x177 sys/kern/subr_prf.c:198
__assert(ffffffff82623463,ffffffff82627923,bc,ffffffff825c4496) at __assert+0x25 sys/kern/subr_prf.c:157
unveil_destroy(ffff8000ffff25c8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188
exit1(ffff80002e6d6000,0,0,1) at exit1+0x3d5 sys/kern/kern_exit.c:219
sys_exit(ffff80002e6d6000,ffff800027c006a0,ffff800027c006f0) at sys_exit+0x16 sys/kern/kern_exit.c:89
syscall(ffff800027c00770) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800027c00770) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffb7d0, count: -8
ddb{0}> machine ddbcpu 1
Stopped at      x86_ipi_db+0x1a:        addq    $0x8,%rsp
x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175
end trace frame: 0x0, count: -5

Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-openbsd-multicore 2022/12/16 00:09 openbsd beb45aa65eb6 6f9c033e .config console log report [disk image] [bsd.gdb] [kernel image] assert "ps->ps_uvncount == NUM" failed in kern_unveil.c
ci-openbsd-main 2022/10/16 07:56 openbsd 750a99bf2ca1 67cb024c .config console log report [disk image] [bsd.gdb] [kernel image] assert "ps->ps_uvncount == NUM" failed in kern_unveil.c
ci-openbsd-multicore 2022/10/04 07:31 openbsd 01ad66f90649 feb56351 .config console log report [disk image] [bsd.gdb] [kernel image] assert "ps->ps_uvncount == NUM" failed in kern_unveil.c
ci-openbsd-main 2022/08/08 18:39 openbsd 470043df5a59 da700653 .config console log report assert "ps->ps_uvncount == NUM" failed in kern_unveil.c
ci-openbsd-main 2022/05/19 18:01 openbsd f9b15afb6ca0 cb1ac2e7 .config console log report assert "ps->ps_uvncount == NUM" failed in kern_unveil.c
* Struck through repros no longer work on HEAD.