syzbot


panic: pr_find_pagehead: pdppl: incorrect page

Status: upstream: reported on 2022/12/01 00:32
Reported-by: syzbot+ef1f11e2e626f47de655@syzkaller.appspotmail.com
First crash: 63d, last: 63d

Sample crash report:
panic: pr_find_pagehead: pdppl: incorrect page
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 290162  55728      0           0          0    0  syz-executor.6
*157225  97064      0     0x14000      0x200    1K reaper
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff825af124) at panic+0x177 sys/kern/subr_prf.c:198
pool_do_put(ffffffff82b6e1f8,fffffd8071311000) at pool_do_put+0x36a
pool_put(ffffffff82b6e1f8,fffffd8071311000) at pool_put+0x8b sys/kern/subr_pool.c:799
pmap_destroy(fffffd8069c255d0) at pmap_destroy+0x25a sys/arch/amd64/amd64/pmap.c:1409
uvm_map_teardown(fffffd80689c81a0) at uvm_map_teardown+0x29a sys/uvm/uvm_map.c:2601
uvmspace_free(fffffd80689c81a0) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3513
reaper(ffff800021233508) at reaper+0x19a sys/kern/kern_exit.c:448
end trace frame: 0x0, count: 7
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
*cpu1: pr_find_pagehead: pdppl: incorrect page
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff825af124) at panic+0x177 sys/kern/subr_prf.c:198
pool_do_put(ffffffff82b6e1f8,fffffd8071311000) at pool_do_put+0x36a
pool_put(ffffffff82b6e1f8,fffffd8071311000) at pool_put+0x8b sys/kern/subr_pool.c:799
pmap_destroy(fffffd8069c255d0) at pmap_destroy+0x25a sys/arch/amd64/amd64/pmap.c:1409
uvm_map_teardown(fffffd80689c81a0) at uvm_map_teardown+0x29a sys/uvm/uvm_map.c:2601
uvmspace_free(fffffd80689c81a0) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3513
reaper(ffff800021233508) at reaper+0x19a sys/kern/kern_exit.c:448
end trace frame: 0x0, count: -8
ddb{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff8000212395c0
rbx               0xffff800020dd9b8f
rdx                                0
rcx                                0
rax               0xffff800021233508
r8                 0x101010101010101
r9                0x8080808080808080
r10               0x28d8584a2612f61f
r11               0xa81f51954bc52c6e
r12               0xffff800020dd9990
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff81d642c8    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff8000212395b0
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (reaper) pid=157225 stat=onproc
    flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
    pri=4, usrpri=85, nice=20
    forw=0xffffffffffffffff, list=0xffff800021233a48,0xffff800021232fd8
    process=0xffff8000fffff670 user=0xffff800021234000, vmspace=0xffffffff82bb1a08
    estcpu=35, cpticks=7, pctcpu=4.32
    user=0, sys=0, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 59210  424323  59326      0  2           0                syz-executor.1
 59210  239509  59326      0  3   0x4000080  fsleep        syz-executor.1
 55728  290162  56776      0  7           0                syz-executor.6
 55728  354409  56776      0  2   0x4000000                syz-executor.6
  2958  243769  16399      0  2           0                syz-executor.5
  2958  372094  16399      0  3   0x4000080  fsleep        syz-executor.5
 41787   55504  54783      0  2           0                syz-executor.3
 41787  243923  54783      0  3   0x4000080  fsleep        syz-executor.3
 20078   96383  72792      0  2           0                syz-executor.0
 20078  276357  72792      0  3   0x4000080  fsleep        syz-executor.0
 20078   53800  72792      0  3   0x4000080  fsleep        syz-executor.0
 50748  227658  23460      0  2           0                syz-executor.7
 50748  161839  23460      0  3   0x4000080  fsleep        syz-executor.7
 51414  131624  95457      0  3        0x82  nanoslp       syz-executor.2
 16399  437907  95457      0  3        0x82  nanoslp       syz-executor.5
 36035   71519  95457      0  3        0x82  nanoslp       syz-executor.4
 56776  416755  95457      0  3        0x82  nanoslp       syz-executor.6
 68658  444122      0      0  3     0x14200  acct          acct
 54783   56338  95457      0  3        0x82  nanoslp       syz-executor.3
 72792  414022  95457      0  3        0x82  nanoslp       syz-executor.0
 59326  225837  95457      0  3        0x82  nanoslp       syz-executor.1
 13088  123361      1      0  3    0x100083  ttyin         getty
 23460  142992  95457      0  3        0x82  nanoslp       syz-executor.7
 79190  354414      0      0  3     0x14200  bored         sosplice
 95457  207364  75576      0  3        0x82  thrsleep      syz-fuzzer
 95457   43665  75576      0  3   0x4000082  thrsleep      syz-fuzzer
 95457  392014  75576      0  3   0x4000082  thrsleep      syz-fuzzer
 95457   72216  75576      0  3   0x4000082  wait          syz-fuzzer
 95457  152364  75576      0  3   0x4000082  wait          syz-fuzzer
 95457  521480  75576      0  3   0x4000082  thrsleep      syz-fuzzer
 95457  310858  75576      0  3   0x4000082  kqread        syz-fuzzer
 95457  109261  75576      0  3   0x4000082  wait          syz-fuzzer
 95457  186166  75576      0  3   0x4000082  thrsleep      syz-fuzzer
 95457  395110  75576      0  3   0x4000082  thrsleep      syz-fuzzer
 95457  157929  75576      0  3   0x4000082  wait          syz-fuzzer
 95457  399270  75576      0  3   0x4000082  wait          syz-fuzzer
 95457  251757  75576      0  3   0x4000082  wait          syz-fuzzer
 95457  475560  75576      0  3   0x4000082  wait          syz-fuzzer
 95457  403497  75576      0  3   0x4000082  thrsleep      syz-fuzzer
 95457    8203  75576      0  3   0x4000082  wait          syz-fuzzer
 75576   96190  66844      0  3    0x10008a  sigsusp       ksh
 66844  220307  22025      0  3        0x9a  kqread        sshd
 22025  402568      1      0  3        0x88  kqread        sshd
 75915  407060  31788     74  3   0x1100092  bpf           pflogd
 31788  417259      1      0  3        0x80  netio         pflogd
 41179   30589  17525     73  3   0x1100090  kqread        syslogd
 17525  508244      1      0  3    0x100082  netio         syslogd
 39633   76968      1      0  3    0x100080  kqread        resolvd
 83807   31228  45426     77  3    0x100092  kqread        dhcpleased
  9160  454935  45426     77  3    0x100092  kqread        dhcpleased
 45426  299658      1      0  3        0x80  kqread        dhcpleased
 33989  465976      0      0  3     0x14200  bored         smr
 33357  200144      0      0  2     0x14200                zerothread
 75320   78615      0      0  3     0x14200  aiodoned      aiodoned
 11070  245494      0      0  3     0x14200  syncer        update
 79888  260086      0      0  3     0x14200  cleaner       cleaner
*97064  157225      0      0  7     0x14200                reaper
 69437   93605      0      0  3     0x14200  pgdaemon      pagedaemon
 34256  128955      0      0  3     0x14200  bored         viomb
 18475   37981      0      0  3  0x40014200  acpi0         acpi0
 55093  489402      0      0  3  0x40014200                idle1
 62132  394633      0      0  3     0x14200  bored         softnet
 83656  207269      0      0  3     0x14200  bored         softnet
 77259  455713      0      0  3     0x14200  bored         softnet
 63610  137073      0      0  3     0x14200  bored         softnet
 27359  211038      0      0  3     0x14200  bored         systqmp
 28200  270470      0      0  3     0x14200  bored         systq
 47474  102977      0      0  3  0x40014200  bored         softclock
 85083  381174      0      0  3  0x40014200                idle0
     1  288702      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10211   6504K    7084K  78643K     22422        0
            pcb    13     12K      13K  78643K       644        0
         rtable   193      7K       9K  78643K      2822        0
         ifaddr    86     20K      20K  78643K       515        0
       counters    58     35K      36K  78643K       276        0
       ioctlops     0      0K       4K  78643K      2161        0
            iov     0      0K      24K  78643K       939        0
          mount     1      1K       1K  78643K         1        0
            log     0      0K       0K  78643K         4        0
         vnodes  1491     93K      93K  78643K     10156        0
      UFS quota     1     32K      32K  78643K         1        0
      UFS mount     5     36K      36K  78643K         5        0
            shm     2      1K       9K  78643K        50        0
         VM map     2      1K       1K  78643K         2        0
            sem    20      6K       8K  78643K       130        0
        dirhash    12      2K       2K  78643K        12        0
           ACPI  1697    195K     286K  78643K     12548        0
      file desc    16     57K      85K  78643K     18696        0
          sigio     0      0K       0K  78643K       140        0
           proc    71     91K     152K  78643K      1439        0
        subproc   104      6K       6K  78643K       455        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
    ip_moptions     0      0K       0K  78643K       448        0
       in_multi    78      5K       6K  78643K       637        0
    ether_multi     1      0K       0K  78643K        91        0
            mrt     1      0K       0K  78643K        50        0
    ISOFS mount     1     32K      32K  78643K         1        0
  MSDOSFS mount     1     16K      16K  78643K         1        0
           ttys    85    387K     387K  78643K        85        0
           exec     0      0K       1K  78643K      1823        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   397    508K     568K  78643K    114412        0
       UVM aobj   131      4K       4K  78643K       154        0
        memdesc     1      4K       4K  78643K         1        0
    crypto data     1      1K       1K  78643K         1        0
    ip6_options     0      0K       0K  78643K       125        0
            NDP    13      0K       2K  78643K       178        0
           temp   133   4702K   70238K  78643K    136691        0
         kqueue    12     18K      26K  78643K       622        0
      SYN cache     2     16K      16K  78643K         2        0
ddb{1}> 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     2206    0     2137    11     8     3     3     0     8    0
rtentry    112      479    0      395     4     1     3     4     0     8    0
unpcb      144    11648    0    11633    49    46     3    10     0     8    2
syncache   296       40    0       40     5     5     0     1     0     8    0
tcpqe       32      471    0      471     6     6     0     1     0     8    0
tcpcb      776     7019    0     7015    24    17     7     8     0     8    6
arp        120       80    0       64     1     0     1     1     0     8    0
inpcb      368     8767    0     8760    38    31     7    13     0     8    6
pool(0xffffffff82b75698:inpcb): page inconsistency: page 0x0; 0 on list, 0 missing, 11 items per page
nd6         48      110    0       89     1     0     1     1     0     8    0
pkpcb       40       21    0       21     4     4     0     1     0     8    0
kcovpl      48       35    0       27     1     0     1     1     0     8    0
mppekey    1024       5    0        5     2     2     0     1     0     8    0
ppxss      1256      36    0       36     6     6     0     1     0     8    0
pppxif     1448      14    0       14     4     4     0     1     0     8    0
pfstscr     40       10    0        6     1     0     1     1     0     8    0
pffrag     232       16    0       16     2     2     0     1     0   482    0
pffrnode    88       16    0       16     2     2     0     1     0     8    0
pffrent     40       32    0       32     2     2     0     1     0     8    0
pfosfp      40     1428    0     1005     5     0     5     5     0     8    0
pfosfpen   112     1428    0      714    21     0    21    21     0     8    0
pfanchor   1280     899   26      387    44     1    43    43     0     8    0
pfstitem    24        8    0        4     1     0     1     1     0     8    0
pfstkey    120       14    0       13     1     0     1     1     0     8    0
pfstate    384        9    0        5     1     0     1     1     0     8    0
rttmr      136       15    0       15     3     3     0     1     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256     1921    0     1582    42    20    22    30     0     8    0
art_table   32     1922    0     1582     4     1     3     4     0     8    0
art_node    16      478    0      405     1     0     1     1     0     8    0
sysvmsgpl   40       30    0       10     1     0     1     1     0     8    0
semapl     112      117    0       99     1     0     1     1     0     8    0
shmpl      112      151    0       23     4     0     4     4     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256    22631    0    21152    93     0    93    93     0     8    0
ffsino     272    22631    0    21152    99     0    99    99     0     8    0
nchpl      144    44720    0    43080    63     0    63    63     0     8    0
uvmvnodes   80     6792    0        0   139     0   139   139     0     8    0
vnodes     216     6792    0        0   378     0   378   378     0     8    0
namei      1024  131772    0   131772     5     4     1     2     0     8    1
percpumem   16      150    0      109     1     0     1     1     0     8    0
vcpupl     2048      29    0        3     4     0     4     4     0     8    0
vmpool     568       29    0        3     3     1     2     3     0     8    0
kstatmem   264      206    0      180     2     0     2     2     0     8    0
scsiplug    72        4    0        4     1     1     0     1     0     8    0
scxspl     216   135694    0   135694    16    15     1     8     0     8    1
plimitpl   152      321    0      305     1     0     1     1     0     8    0
sigapl     424    18965    0    18915     7     1     6     6     0     8    0
futexpl     64   109396    0   109390     7     6     1     1     0     8    0
knotepl    120      672    0        0    15     1    14    15     0     8    0
kqueuepl   216     2013    0     2005    11    10     1     5     0     8    0
pipepl     320     2216    0     2188    34    26     8     8     0     8    5
fdescpl    496    18939    0    18910     6     2     4     5     0     8    0
filepl     152    83695    0    83389    79    62    17    20     0     8    5
lockfpl    104     1441    0     1439     4     3     1     2     0     8    0
lockfspl    48      559    0      557     1     0     1     1     0     8    0
sessionpl  144       52    0       35     1     0     1     1     0     8    0
pgrppl      48       82    0       65     1     0     1     1     0     8    0
ucredpl    104     3989    0     3976     1     0     1     1     0     8    0
zombiepl   144    18917    0    18915     1     0     1     1     0     8    0
processpl  1072   18965    0    18915     4     0     4     4     0     8    0
procpl     672    42974    0    42902    10     3     7     8     0     8    0
srpgc       96       36    0       36     7     7     0     1     0     8    0
sosppl     168       61    0       61     8     8     0     1     0     8    0
sockpl     488    22657    0    22566   184   172    12    34     0     8    0
mcl64k     65536     17    0        0     3     0     3     3     0     8    0
mcl16k     16384     14    0        0     2     0     2     2     0     8    0
mcl12k     12288     41    0        0     2     0     2     2     0     8    0
mcl9k      9216      17    0        0     2     0     2     2     0     8    0
mcl8k      8192      33    0        0     3     0     3     3     0     8    0
mcl4k      4096      33    0        0     3     0     3     3     0     8    0
mcl2k2     2112       8    0        0     1     0     1     1     0     8    0
mcl2k      2048     674    0        0    39     9    30    39     0     8    0
mtagpl      96      294    0        0     5     0     5     5     0     8    0
mbufpl     256     3912    0        0   219     0   219   219     0     8    0
bufpl      288    29488    0    22697   486     0   486   486     0     8    0
anonpl      24  3264223    0  3249403   256   154   102   223     0   186    0
amapchunkpl 152  321898    0   321168   104    73    31    85     0   158    0
amappl16   200    25088    0    24659    82    59    23    31     0     8    0
amappl15   192        9    0        9     1     1     0     1     0     8    0
amappl14   184      236    0      220     2     1     1     2     0     8    0
amappl13   176        7    0        7     1     1     0     1     0     8    0
amappl12   168      767    0      764     1     0     1     1     0     8    0
amappl11   160       55    0       40     1     0     1     1     0     8    0
amappl10   152       62    0       50     1     0     1     1     0     8    0
amappl9    144      965    0      965    11    11     0     1     0     8    0
amappl8    136      413    0      319     5     1     4     4     0     8    0
amappl7    128      112    0       92     1     0     1     1     0     8    0
amappl6    120      636    0      614     2     1     1     2     0     8    0
amappl5    112      168    0      157     1     0     1     1     0     8    0
amappl4    104      895    0      854     3     1     2     2     0     8    0
amappl3     96    51438    0    51380     2     0     2     2     0     8    0
amappl2     88    19869    0    19788     3     1     2     3     0     8    0
amappl1     80   405683    0   404905    25     7    18    22     0     8    1
amappl      88   113765    0   113536     6     0     6     6     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      153    0       23     3     0     3     3     0     8    0
uaddrrnd    24    18968    0    18913     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24    18968    0    18913     1     0     1     1     0     8    0
vmmpekpl   168   113294    0   113225     4     0     4     4     0     8    0
vmmpepl    168  1634884    0  1632159   238   110   128   141     0   357    2
vmsppl     368    18967    0    18912     7     1     6     6     0     8    0
rwobjpl     56   400340    0   391696   127     4   123   123     0     8    0
pdppl      4096   37943    0    37850   625   530    95   102     0     8    2
pool(0xffffffff82b6e1f8:pdppl): page inconsistency: page 0x0; 0 on list, 0 missing, 1 items per page
pool(0xffffffff82b6e1f8:pdppl): page inconsistency: page 0x0; 0 on list, 0 missing, 1 items per page
pvpl        32  6764207    0  6743390   534   338   196   418     0   265    0
pmappl     248    18967    0    18912     5     1     4     4     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112     1683    0      605    32     0    32    32     0     8    0
phpool: pool(0xffffffff82ab2ec0:phpool): page inconsistency: page 0x0; at page head addr 0xfffffd805e132f90 (p 0xfffffd805e132000)
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x1a:        addq    $0x8,%rsp
x86_ipi_db(ffffffff829cbff0) 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
end of kernel
end trace frame: 0x7f7ffff037d0, count: 12
ddb{0}> trace
x86_ipi_db(ffffffff829cbff0) 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
end of kernel
end trace frame: 0x7f7ffff037d0, count: -3
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff825af124) at panic+0x177 sys/kern/subr_prf.c:198
pool_do_put(ffffffff82b6e1f8,fffffd8071311000) at pool_do_put+0x36a
pool_put(ffffffff82b6e1f8,fffffd8071311000) at pool_put+0x8b sys/kern/subr_pool.c:799
pmap_destroy(fffffd8069c255d0) at pmap_destroy+0x25a sys/arch/amd64/amd64/pmap.c:1409
uvm_map_teardown(fffffd80689c81a0) at uvm_map_teardown+0x29a sys/uvm/uvm_map.c:2601
uvmspace_free(fffffd80689c81a0) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3513
reaper(ffff800021233508) at reaper+0x19a sys/kern/kern_exit.c:448
end trace frame: 0x0, count: 7
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff825af124) at panic+0x177 sys/kern/subr_prf.c:198
pool_do_put(ffffffff82b6e1f8,fffffd8071311000) at pool_do_put+0x36a
pool_put(ffffffff82b6e1f8,fffffd8071311000) at pool_put+0x8b sys/kern/subr_pool.c:799
pmap_destroy(fffffd8069c255d0) at pmap_destroy+0x25a sys/arch/amd64/amd64/pmap.c:1409
uvm_map_teardown(fffffd80689c81a0) at uvm_map_teardown+0x29a sys/uvm/uvm_map.c:2601
uvmspace_free(fffffd80689c81a0) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3513
reaper(ffff800021233508) at reaper+0x19a sys/kern/kern_exit.c:448
end trace frame: 0x0, count: -8

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-openbsd-multicore 2022/12/01 00:32 openbsd dc8195713cae 4c2a66e8 .config console log report [disk image] [bsd.gdb] [kernel image] panic: pr_find_pagehead: pdppl: incorrect page
* Struck through repros no longer work on HEAD.