syzbot


panic: pr_find_pagehead: mbufpl: page header missing (2)

Status: auto-closed as invalid on 2020/03/12 10:50
Reported-by: syzbot+62dba36832271d6e463b@syzkaller.appspotmail.com
First crash: 1766d, last: 1766d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd panic: pr_find_pagehead: mbufpl: page header missing (3) 2 1570d 1603d 0/3 auto-closed as invalid on 2020/09/23 20:57
openbsd panic: pr_find_pagehead: mbufpl: page header missing C 10 2126d 2139d 3/3 fixed on 2018/12/28 21:36

Sample crash report:
panic: pr_find_pagehead: mbufpl: page header missing
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*246501  45494      0           0  0x4000000    0  syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff821e3a76) at panic+0x15c sys/kern/subr_prf.c:207
pool_do_put(ffffffff825405f8,fffffd802ccd0000) at pool_do_put+0x36a
pool_put(ffffffff825405f8,fffffd802ccd0000) at pool_put+0x4b sys/kern/subr_pool.c:802
m_free(fffffd802ccd0000) at m_free+0x119 sys/kern/uipc_mbuf.c:459
ml_purge(ffff800017b6a008) at ml_purge+0x50 m_freem sys/kern/uipc_mbuf.c:538 [inline]
ml_purge(ffff800017b6a008) at ml_purge+0x50 sys/kern/uipc_mbuf.c:1628
ifq_purge(ffff8000009e6a78) at ifq_purge+0x97 sys/net/ifq.c:423
if_down(ffff8000009e6800) at if_down+0x9c if_linkstate sys/net/if.c:1677 [inline]
if_down(ffff8000009e6800) at if_down+0x9c sys/net/if.c:1628
if_setrdomain(ffff8000009e6800,6) at if_setrdomain+0x17c sys/net/if.c:1880
ifioctl(fffffd80363b4d88,8020699f,ffff800017b6a1d0,ffff800014930290) at ifioctl+0x169d sys/net/if.c:2148
sys_ioctl(ffff800014930290,ffff800017b6a2e8,ffff800017b6a330) at sys_ioctl+0x5b9
syscall(ffff800017b6a3b0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe4312953010, count: 2
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> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
pr_find_pagehead: mbufpl: page header missing
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff821e3a76) at panic+0x15c sys/kern/subr_prf.c:207
pool_do_put(ffffffff825405f8,fffffd802ccd0000) at pool_do_put+0x36a
pool_put(ffffffff825405f8,fffffd802ccd0000) at pool_put+0x4b sys/kern/subr_pool.c:802
m_free(fffffd802ccd0000) at m_free+0x119 sys/kern/uipc_mbuf.c:459
ml_purge(ffff800017b6a008) at ml_purge+0x50 m_freem sys/kern/uipc_mbuf.c:538 [inline]
ml_purge(ffff800017b6a008) at ml_purge+0x50 sys/kern/uipc_mbuf.c:1628
ifq_purge(ffff8000009e6a78) at ifq_purge+0x97 sys/net/ifq.c:423
if_down(ffff8000009e6800) at if_down+0x9c if_linkstate sys/net/if.c:1677 [inline]
if_down(ffff8000009e6800) at if_down+0x9c sys/net/if.c:1628
if_setrdomain(ffff8000009e6800,6) at if_setrdomain+0x17c sys/net/if.c:1880
ifioctl(fffffd80363b4d88,8020699f,ffff800017b6a1d0,ffff800014930290) at ifioctl+0x169d sys/net/if.c:2148
sys_ioctl(ffff800014930290,ffff800017b6a2e8,ffff800017b6a330) at sys_ioctl+0x5b9
syscall(ffff800017b6a3b0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe4312953010, count: -13
ddb> show registers
rdi               0xffffffff816a1567    db_enter+0x17
rsi                           0x28b8    __ALIGN_SIZE+0x18b8
rbp               0xffff800017b69db0
rbx               0xffff800017b69e60
rdx                           0x28b9    __ALIGN_SIZE+0x18b9
rcx               0xffff800016b65000
rax               0xffff800016b65000
r8                0xffff800017b69d70
r9                               0x1
r10               0xffff8000009e8340
r11               0x3655adfdae864c8d
r12                     0x3000000008
r13               0xffff800017b69dc0
r14                            0x100
r15                              0x1
rip               0xffffffff816a1568    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800017b69da0
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb> show proc
PROC (syz-executor.1) pid=246501 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=67, usrpri=67, nice=20
    forw=0xffffffffffffffff, list=0xffff8000149313d8,0xffffffff82579858
    process=0xffff8000ffff6a48 user=0xffff800017b65000, vmspace=0xfffffd803f012550
    estcpu=36, cpticks=0, pctcpu=0.0
    user=0, sys=0, intr=0
ddb> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 45494   71179  32291      0  2           0                syz-executor.1
*45494  246501  32291      0  7   0x4000000                syz-executor.1
 68392  379591      0      0  3     0x14200  bored         sosplice
 16048   64083   2747      0  3         0x2  biowait       syz-executor.0
 32291   41201   2747      0  3        0x82  nanosleep     syz-executor.1
  2747  507393  76415      0  3        0x82  thrsleep      syz-fuzzer
  2747  342559  76415      0  3   0x4000082  nanosleep     syz-fuzzer
  2747    2921  76415      0  3   0x4000082  thrsleep      syz-fuzzer
  2747  293519  76415      0  3   0x4000082  thrsleep      syz-fuzzer
  2747  243452  76415      0  3   0x4000082  thrsleep      syz-fuzzer
  2747  188097  76415      0  3   0x4000082  kqread        syz-fuzzer
  2747  270720  76415      0  3   0x4000082  thrsleep      syz-fuzzer
 76415  441727  37614      0  3    0x10008a  pause         ksh
 37614  242701  26203      0  3        0x92  select        sshd
 31053  178461      1      0  3    0x100083  ttyin         getty
 26203  218713      1      0  3        0x80  select        sshd
 59466   24288  10967     73  3    0x100090  kqread        syslogd
 10967  155241      1      0  3    0x100082  netio         syslogd
 46205   90503      1     77  2    0x100090                dhclient
 24853  396974      1      0  3        0x80  poll          dhclient
 28970  403580      0      0  2     0x14200                zerothread
 90326  400005      0      0  3     0x14200  aiodoned      aiodoned
 52684   62205      0      0  3     0x14200  syncer        update
 31131  168652      0      0  3     0x14200  cleaner       cleaner
  9635   97912      0      0  3     0x14200  reaper        reaper
 34545  226529      0      0  3     0x14200  pgdaemon      pagedaemon
 97066  492435      0      0  3     0x14200  bored         crynlk
 30098  436047      0      0  3     0x14200  bored         crypto
  9600  235502      0      0  3  0x40014200  acpi0         acpi0
 53043  253911      0      0  3     0x14200  bored         softnet
 42223   28481      0      0  3     0x14200  bored         systqmp
 92877   34835      0      0  3     0x14200  bored         systq
 19915  243919      0      0  3  0x40014200  bored         softclock
 84710  231480      0      0  3  0x40014200                idle0
  5935  147026      0      0  3     0x14200  bored         smr
     1  281412      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb> show all locks
No such command
ddb> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf  9506   6721K    6780K  78643K     10849        0
            pcb    13      8K       8K  78643K        41        0
         rtable   111      4K       4K  78643K       245        0
         ifaddr    60     12K      13K  78643K        91        0
       counters    19     16K      16K  78643K        19        0
       ioctlops     0      0K       2K  78643K        28        0
            iov     0      0K      16K  78643K        24        0
          mount     1      1K       1K  78643K         1        0
         vnodes  1218     77K      77K  78643K      1307        0
      UFS quota     1     32K      32K  78643K         1        0
      UFS mount     5     36K      36K  78643K         5        0
            shm     2      1K       1K  78643K         2        0
         VM map     2      0K       0K  78643K         2        0
            sem    12      0K       0K  78643K        71        0
        dirhash    12      2K       2K  78643K        12        0
           ACPI  1794    195K     288K  78643K     12646        0
      file desc     5     13K      25K  78643K       141        0
          sigio     0      0K       0K  78643K         8        0
           proc    48     38K      63K  78643K       359        0
        subproc    32      2K       2K  78643K        34        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
    ip_moptions     0      0K       0K  78643K         9        0
       in_multi    47      2K       3K  78643K        52        0
    ether_multi     1      0K       0K  78643K         4        0
            mrt     0      0K       0K  78643K         1        0
    ISOFS mount     1     32K      32K  78643K         1        0
  MSDOSFS mount     1     16K      16K  78643K         1        0
           ttys    42    185K     185K  78643K        42        0
           exec     0      0K       1K  78643K       189        0
        pagedep     1      8K       8K  78643K         1        0
       inodedep     1     32K      32K  78643K         1        0
         newblk     1      0K       0K  78643K         1        0
        VM swap     7     26K      26K  78643K         7        0
       UVM amap   109     38K      38K  78643K      1188        0
       UVM aobj    10      2K       2K  78643K        10        0
        memdesc     1      4K       4K  78643K         1        0
    crypto data     1      1K       1K  78643K         1        0
    ip6_options     0      0K       0K  78643K        24        0
            NDP     9      0K       0K  78643K        17        0
           temp   117   3025K    3089K  78643K      6011        0
      SYN cache     2     16K      16K  78643K         2        0
ddb> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp         64        6    0        0     1     0     1     1     0     8    0
rtpcb       80       25    0       23     1     0     1     1     0     8    0
rtentry    112       45    0        1     2     0     2     2     0     8    0
unpcb      120       99    0       91     1     0     1     1     0     8    0
syncache   264        6    0        6     2     1     1     1     0     8    1
tcpqe       32      110    0      110     1     1     0     1     0     8    0
tcpcb      544       73    0       69     2     1     1     2     0     8    0
inpcb      280      190    0      182     2     1     1     2     0     8    0
nd6         48        4    0        0     1     0     1     1     0     8    0
ppxss      1128       4    0        4     1     0     1     1     0     8    1
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      212    0        0    14     0    14    14     0     8    0
art_table   32      213    0        0     2     0     2     2     0     8    0
art_node    16       44    0        4     1     0     1     1     0     8    0
sysvmsgpl   40       32    0       32     1     0     1     1     0     8    1
semupl     112        2    0        2     1     1     0     1     0     8    0
semapl     112       69    0       59     1     0     1     1     0     8    0
shmpl      112        8    0        0     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino1pl    128     1598    0      196    46     0    46    46     0     8    0
ffsino     240     1598    0      196    83     0    83    83     0     8    0
nchpl      144     2033    0      419    60     0    60    60     0     8    0
uvmvnodes   72     1704    0        0    31     0    31    31     0     8    0
vnodes     208     1704    0        0    90     0    90    90     0     8    0
namei      1024    5157    0     5157     1     0     1     1     0     8    1
vcpupl     1984       1    0        0     1     0     1     1     0     8    0
vmpool     528        1    0        0     1     0     1     1     0     8    0
scxspl     192     5368    0     5367     8     3     5     7     0     8    4
plimitpl   152       20    0       13     1     0     1     1     0     8    0
sigapl     432      312    0      299     2     0     2     2     0     8    0
futexpl     56     3535    0     3535     1     0     1     1     0     8    1
knotepl    112       69    0       50     1     0     1     1     0     8    0
kqueuepl   104       31    0       29     1     0     1     1     0     8    0
pipepl     128      206    0      187     1     0     1     1     0     8    0
fdescpl    424      313    0      299     2     0     2     2     0     8    0
filepl     120     2040    0     1944     4     0     4     4     0     8    1
lockfpl    104       39    0       38     1     0     1     1     0     8    0
lockfspl    48       16    0       15     1     0     1     1     0     8    0
sessionpl  112       17    0        7     1     0     1     1     0     8    0
pgrppl      48       21    0       11     1     0     1     1     0     8    0
ucredpl     96      141    0      134     1     0     1     1     0     8    0
zombiepl   144      299    0      299     1     0     1     1     0     8    1
processpl  872      328    0      299     4     0     4     4     0     8    0
procpl     632      492    0      456     4     0     4     4     0     8    0
sosppl     128        3    0        3     1     0     1     1     0     8    1
sockpl     384      314    0      296     4     0     4     4     0     8    2
mcl64k     65536      7    0        7     1     0     1     1     0     8    1
mcl16k     16384      2    0        2     1     0     1     1     0     8    1
mcl12k     12288      2    0        2     1     0     1     1     0     8    1
mcl9k      9216       2    0        2     1     0     1     1     0     8    1
mcl8k      8192       4    0        4     1     0     1     1     0     8    1
mcl4k      4096      23    0       23     2     1     1     1     0     8    1
mcl2k      2048   65819    0    65774    15     7     8    13     0     8    1
mtagpl      80        6    0        4     2     1     1     1     0     8    0
mbufpl     256   105198    0   105108    13     3    10    10     0     8    1
bufpl      280     6331    0     1504   345     0   345   345     0     8    0
anonpl      16    48487    0    29186    82     1    81    81     0    62    3
amapchunkpl 152    1393    0     1244     8     1     7     8     0   158    0
amappl16   192     1657    0      558    58     0    58    58     0     8    3
amappl15   184      163    0      156     1     0     1     1     0     8    0
amappl14   176       25    0       23     1     0     1     1     0     8    0
amappl13   168       54    0       51     1     0     1     1     0     8    0
amappl12   160        5    0        3     1     0     1     1     0     8    0
amappl11   152       48    0       36     1     0     1     1     0     8    0
amappl10   144       10    0        9     1     0     1     1     0     8    0
amappl9    136      567    0      563     1     0     1     1     0     8    0
amappl8    128      109    0       90     1     0     1     1     0     8    0
amappl7    120       90    0       79     1     0     1     1     0     8    0
amappl6    112       57    0       51     1     0     1     1     0     8    0
amappl5    104      138    0      128     1     0     1     1     0     8    0
amappl4     96      578    0      547     1     0     1     1     0     8    0
amappl3     88      121    0      111     1     0     1     1     0     8    0
amappl2     80     1727    0     1655     3     1     2     3     0     8    0
amappl1     72    15256    0    14829    26    16    10    20     0     8    0
amappl      80      716    0      672     2     0     2     2     0    84    1
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       18    0       17     1     0     1     1     0     8    0
aobjpl      64        9    0        0     1     0     1     1     0     8    0
uaddrrnd    24      314    0      299     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      314    0      299     1     0     1     1     0     8    0
vmmpekpl   168     6090    0     6066     2     0     2     2     0     8    0
vmmpepl    168    45659    0    43462   138    12   126   130     0   357   29
vmsppl     272      313    0      299     2     0     2     2     0     8    1
pdppl      4096     634    0      599     6     1     5     6     0     8    0
pvpl        32   153062    0   130781   191     1   190   190     0   265    9
pmappl     200      313    0      299     1     0     1     1     0     8    0
extentpl    40       46    0       29     1     0     1     1     0     8    0
phpool     112      147    0       15     4     0     4     4     0     8    0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/13 10:49 openbsd 757f1589f1b9 2a752b7c .config console log report ci-openbsd-main
* Struck through repros no longer work on HEAD.