syzbot

panic: pool_do_get: shmpl free list modified: page 0xfffffd805f99b000; item addr 0xfffffd805f99b9a0; offset 0x40=0x68867ef1
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 116883  64150  32767        0x10          0    0  syz-executor
* 56375  69000  32767        0x10  0x4000000    1K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833da8a8) at panic+0x1e5 sys/kern/subr_prf.c:198
pool_do_get(ffffffff839521e0,1,ffff80003c477bf8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1
pool_get(ffffffff839521e0,1) at pool_get+0x149 sys/kern/subr_pool.c:-1
shmget_allocate_segment(ffff80003c47f9d0,ffff80003c477e50,0,ffff80003c477da0) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1
sys_shmget(ffff80003c47f9d0,ffff80003c477e50,ffff80003c477da0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482
syscall(ffff80003c477e50) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c477e50) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x77c39935210, 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: pool_do_get: shmpl free list modified: page 0xfffffd805f99b000; item addr 0xfffffd805f99b9a0; offset 0x40=0x68867ef1
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833da8a8) at panic+0x1e5 sys/kern/subr_prf.c:198
pool_do_get(ffffffff839521e0,1,ffff80003c477bf8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1
pool_get(ffffffff839521e0,1) at pool_get+0x149 sys/kern/subr_pool.c:-1
shmget_allocate_segment(ffff80003c47f9d0,ffff80003c477e50,0,ffff80003c477da0) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1
sys_shmget(ffff80003c47f9d0,ffff80003c477e50,ffff80003c477da0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482
syscall(ffff80003c477e50) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c477e50) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x77c39935210, count: -8
ddb{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff80003c477a20
rbx               0xffff8000299deddf
rdx               0xffff800001472900
rcx               0xffff80003c47f9d0
rax               0xffff8000299ddff0
r8                 0x101010101010101
r9                0x8080808080808080
r10               0x428df63a30294db4
r11               0x17c31a07aaced1eb
r12               0xffff8000299debe0
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff8139bc55    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80003c477a10
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=56375 pid=69000 tcnt=3 stat=onproc
    flags process=10<SUGID> proc=4000000<THREAD>
    runpri=32, usrpri=73, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80003c47e550,0xffff80003c47e040
    process=0xffff80003c46a250 user=0xffff80003c472000, vmspace=0xfffffd806baa6028
    estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 26796  337507   1573  32767  2        0x10                syz-executor
 26796  363551   1573  32767  3   0x4000090  fsleep        syz-executor
 26796  291842   1573  32767  3   0x4000090  kqread        syz-executor
 64150  116883   1165  32767  7        0x10                syz-executor
 64150  197593   1165  32767  3   0x4000090  fifow         syz-executor
 56623  499231  27518  32767  2        0x10                syz-executor
 56623  185055  27518  32767  3   0x4000090  fsleep        syz-executor
 56623   85940  27518  32767  3   0x4000090  fsleep        syz-executor
 69000  473679  65140  32767  2        0x10                syz-executor
*69000   56375  65140  32767  7   0x4000010                syz-executor
 69000  219212  65140  32767  3   0x4000090  fsleep        syz-executor
 18134  269929  56675  32767  2        0x10                syz-executor
 18134  291363  56675  32767  3   0x4000090  fsleep        syz-executor
 31932  394368   6847  32767  2        0x10                syz-executor
 31932   52904   6847  32767  3   0x4000090  fsleep        syz-executor
 31932  500327   6847  32767  3   0x4000090  fsleep        syz-executor
  3897  465234      0      0  3     0x14200  bored         sosplice
 58283   59859  31573  32767  3        0x90  nanoslp       syz-executor
 58283  323361  31573  32767  3   0x4000090  kqpoll        syz-executor
 58283  371869  31573  32767  3   0x4000090  fsleep        syz-executor
  1573  479631  98310  32767  3        0x90  nanoslp       syz-executor
 65140  366188  91468  32767  3        0x90  nanoslp       syz-executor
 31573  500388  52286  32767  3        0x90  nanoslp       syz-executor
  6847  298209   4055  32767  3        0x90  nanoslp       syz-executor
  7724  361540  75135  32767  3        0x10  biowait       syz-executor
 27518  301259  61776  32767  3        0x90  nanoslp       syz-executor
  1165  276336  56819  32767  3        0x90  nanoslp       syz-executor
 56675  149213  85939  32767  3        0x90  nanoslp       syz-executor
 91468   31253  85833      0  3        0x82  wait          syz-executor
 52286  284278  85833      0  3        0x82  wait          syz-executor
  4055  278034  85833      0  3        0x82  wait          syz-executor
 98310  155313  85833      0  3        0x82  wait          syz-executor
 75135  423914  85833      0  3        0x82  wait          syz-executor
 61776  282455  85833      0  3        0x82  wait          syz-executor
 56819  167754  85833      0  3        0x82  wait          syz-executor
 85939  408011  85833      0  3        0x82  wait          syz-executor
 85833  309348  35352      0  3        0x82  kqread        syz-executor
 35352  355878  79316      0  3    0x10008a  sigsusp       ksh
 79316   17828  21804      0  3        0x98  kqread        sshd-session
 21804  395362  48376      0  3        0x92  kqread        sshd-session
  3564   16177      1      0  3    0x100083  ttyin         getty
 48376  191121      1      0  3        0x88  kqread        sshd
 22437   85506  12977     73  3   0x1100090  kqread        syslogd
 12977  242912      1      0  3    0x100082  sbwait        syslogd
  3275  222734      1      0  3    0x100080  kqread        resolvd
 28363  402475  79291     77  3    0x100092  kqread        dhcpleased
 86168  288685  79291     77  3    0x100092  kqread        dhcpleased
 79291  395169      1      0  3        0x80  kqread        dhcpleased
 23334  325004      0      0  3     0x14200  bored         smr
 85591   58963      0      0  2     0x14200                zerothread
 86443  345816      0      0  3     0x14200  aiodoned      aiodoned
 66254  280170      0      0  3     0x14200  syncer        update
  3763  395862      0      0  3     0x14200  cleaner       cleaner
 84554  231183      0      0  3     0x14200  reaper        reaper
 89170  372904      0      0  3     0x14200  pgdaemon      pagedaemon
 13381  186825      0      0  3     0x14200  bored         viomb
 39221  182888      0      0  3  0x40014200  acpi0         acpi0
 58029  491433      0      0  3  0x40014200                idle1
 63307  437920      0      0  3     0x14200  bored         softnet7
 28391  375323      0      0  3     0x14200  bored         softnet6
 10415  113185      0      0  3     0x14200  bored         softnet5
 53577  287699      0      0  3     0x14200  bored         softnet4
 74233  373235      0      0  3     0x14200  bored         softnet3
  8838  407560      0      0  3     0x14200  bored         softnet2
 79070  322398      0      0  3     0x14200  bored         softnet1
 19191  421167      0      0  3     0x14200  bored         softnet0
  1756  206919      0      0  3     0x14200  bored         systqmp
 67733  162650      0      0  3     0x14200  bored         systq
 27863   12205      0      0  3     0x14200  tmoslp        softclockmp
 28764   30699      0      0  3  0x40014200  tmoslp        softclock
 56181  461665      0      0  3  0x40014200                idle0
     1  307467      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex shmpl r = 0 (0xffffffff839521f8)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2  mtx_enter+0x62 sys/kern/kern_lock.c:261
#3  pool_get+0x10b sys/kern/subr_pool.c:578
#4  shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1
#5  sys_shmget+0x1b2 sys/kern/sysv_shm.c:482
#6  syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6  syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
#7  Xsyscall+0x128
Process 69000 (syz-executor) thread 0xffff80003c47f9d0 (56375)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839a0720)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#1  syscall+0xae6 sys/arch/amd64/amd64/trap.c:748
#2  Xsyscall+0x128
exclusive mutex shmpl r = 0 (0xffffffff839521f8)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2  mtx_enter+0x62 sys/kern/kern_lock.c:261
#3  pool_get+0x10b sys/kern/subr_pool.c:578
#4  shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1
#5  sys_shmget+0x1b2 sys/kern/sysv_shm.c:482
#6  syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6  syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
#7  Xsyscall+0x128
Process 7724 (syz-executor) thread 0xffff80002a2d4540 (361540)
exclusive rrwlock inode r = 0 (0xfffffd806e52b5b0)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x42b sys/kern/kern_rwlock.c:319
#2  rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
#4  ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4  ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159
#5  ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6  ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393
#7  ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112
#8  VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394
#9  domkdirat+0x179 sys/kern/vfs_syscalls.c:3109
#10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806ca80a08)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x42b sys/kern/kern_rwlock.c:319
#2  rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
#4  vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5  vfs_lookup+0x109 sys/kern/vfs_lookup.c:418
#6  namei+0x7aa sys/kern/vfs_lookup.c:250
#7  domkdirat+0x8b sys/kern/vfs_syscalls.c:3094
#8  syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8  syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
#9  Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10193  10956K   10968K 166960K     11271        0
            pcb    17     12K      12K 166960K        17        0
         rtable   205      5K       6K 166960K       256        0
             pf    31     16K      16K 166960K        31        0
         ifaddr    42      7K       7K 166960K        44        0
        ifgroup    50      2K       2K 166960K        50        0
         sysctl     3      1K       9K 166960K         7        0
       counters    68     36K      36K 166960K        68        0
       ioctlops     0      0K       2K 166960K        31        0
            iov     0      0K       1K 166960K         2        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1335     84K      84K 166960K      1354        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       5K 166960K         5        0
         VM map     2      1K       1K 166960K         2        0
            sem     7      0K       0K 166960K         7        0
        dirhash    12      2K       2K 166960K        12        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    25     93K     121K 166960K       210        0
           proc    61    115K     131K 166960K       485        0
        subproc    72      4K       4K 166960K        72        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     16K      16K 166960K         1        0
    ip_moptions     0      0K       0K 166960K         9        0
       in_multi    99      7K       7K 166960K       100        0
    ether_multi     1      0K       0K 166960K         1        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys    61    281K     281K 166960K        61        0
           exec     0      0K       1K 166960K       342        0
   fusefs mount     1     32K      32K 166960K         1        0
            tdb     3      0K       0K 166960K         3        0
        VM swap     8     62K      64K 166960K        10        0
       UVM amap   245    151K     161K 166960K      3268        0
       UVM aobj     5      2K       3K 166960K         7        0
     pinsyscall    46     92K     108K 166960K      1207        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     2      0K       0K 166960K         6        0
            NDP    11      0K       2K 166960K        27        0
           temp    36   8671K    8736K 166960K      3898        0
         kqueue    16     26K      31K 166960K        36        0
      SYN cache     2     16K      16K 166960K         2        0
ddb{1}> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache    128       26    0        0     1     0     1     1     0     8    0
rtpcb      120       43    0       39     1     0     1     1     0     8    0
rtentry    176       95    0        1     5     0     5     5     0     8    0
unpcb      144       60    0       42     1     0     1     1     0     8    0
syncache   336        4    0        4     1     0     1     1     0     8    1
tcpcb      736       39    0       32     2     0     2     2     0     8    0
arp        128       10    0        0     1     0     1     1     0     8    0
ipq         40        2    0        0     1     0     1     1     0     8    0
ipqe        40        4    0        1     1     0     1     1     0     8    0
inpcb      328      126    0      112     2     0     2     2     0     8    0
nd6        144       16    0        0     1     0     1     1     0     8    0
kcovpl      48        8    0        0     1     0     1     1     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      437    0        0    28     0    28    28     0     8    0
art_table   40      438    0        0     5     0     5     5     0     8    0
art_node    32       95    0       11     1     0     1     1     0     8    0
semupl     112        1    0        1     1     0     1     1     0     8    1
semapl     112        5    0        0     1     0     1     1     0     8    0
shmpl      112        4    0        2     1     0     1     1     0     8    0
pool(0xffffffff839521e0:shmpl): page inconsistency: page 0xfffffd805f99b000; 32 on list, 2 missing, 35 items per page
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1638    0      130    95     0    95    95     0     8    0
ffsino     296     1638    0      130   117     0   117   117     0     8    0
nchpl      144     1915    0      233    63     0    63    63     0     8    0
uvmvnodes   80     1719    0        0    36     0    36    36     0     8    0
vnodes     216     1719    0        0    96     0    96    96     0     8    0
namei      1024    5671    0     5670     1     0     1     1     0     8    0
percpumem   16       49    0        0     1     0     1     1     0     8    0
kstatmem   264       24    0        0     2     0     2     2     0     8    0
scxspl     216     6751    0     6750     3     1     2     2     1     8    1
plimitpl   152       47    0       21     2     0     2     2     0     8    0
sigapl     424      486    0      426     8     0     8     8     0     8    0
knotepl    120      336    0        0    11     0    11    11     0     8    0
kqueuepl   224       40    0       25     1     0     1     1     0     8    0
pipepl     344      104    0       77     3     0     3     3     0     8    0
fdescpl    528      463    0      426     3     0     3     3     0     8    0
filepl     160     1610    0     1386    10     0    10    10     0     8    0
lockfpl    104       20    0       17     1     0     1     1     0     8    0
lockfspl    48       10    0        7     1     0     1     1     0     8    0
sessionpl  144       22    0        6     1     0     1     1     0     8    0
pgrppl      48       32    0        8     1     0     1     1     0     8    0
ucredpl    104      157    0      138     1     0     1     1     0     8    0
zombiepl   144      426    0      426     1     0     1     1     0     8    1
processpl  1248     486    0      426     7     1     6     6     0     8    0
procpl     656      609    0      537     7     0     7     7     0     8    0
sosppl     168        1    0        1     1     0     1     1     0     8    1
sockpl     752      229    0      193     5     0     5     5     0     8    1
mcl64k     65536      2    0        0     1     0     1     1     0     8    0
mcl16k     16384      1    0        0     1     0     1     1     0     8    0
mcl8k      8192       2    0        0     1     0     1     1     0     8    0
mcl4k      4096     131    0        0    17     0    17    17     0     8    0
mcl2k      2048      19    0        0     3     0     3     3     0     8    0
mtagpl      96        1    0        0     1     0     1     1     0     8    0
mbufpl     256      185    0        0    12     0    12    12     0     8    0
bufpl      280     2900    0      112   200     0   200   200     0     8    0
anonpl      32     5383    0        0    44     0    44    44     0   246    0
amapchunkpl 152    8975    0     8429    31     3    28    28     0   158    4
amappl16   200      290    0      268     5     0     5     5     0     8    1
amappl15   192        2    0        2     1     1     0     1     0     8    0
amappl14   184       97    0       87     1     0     1     1     0     8    0
amappl13   176        4    0        3     1     0     1     1     0     8    0
amappl12   168     1051    0     1014     2     0     2     2     0     8    0
amappl11   160       41    0       31     1     0     1     1     0     8    0
amappl9    144      249    0      249     1     1     0     1     0     8    0
amappl8    136       20    0       19     1     0     1     1     0     8    0
amappl7    128       90    0       80     1     0     1     1     0     8    0
amappl6    120      160    0      157     1     0     1     1     0     8    0
amappl5    112      108    0      102     1     0     1     1     0     8    0
amappl4    104      249    0      234     1     0     1     1     0     8    0
amappl3     96     1642    0     1514     4     0     4     4     0     8    0
amappl2     88      590    0      537     2     0     2     2     0     8    0
amappl1     80     8120    0     7533    14     0    14    14     0     8    0
amappl      88     2645    0     2464     5     0     5     5     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        6    0        2     1     0     1     1     0     8    0
uaddrrnd    24      463    0      426     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      463    0      426     1     0     1     1     0     8    0
vmmpekpl   168     5278    0     5244     2     0     2     2     0     8    0
vmmpepl    168    33487    0    31379   100     0   100   100     0   357    3
vmsppl     488      462    0      426     7     1     6     6     0     8    1
rwobjpl     80    12483    0     9918    56     1    55    55     0     8    0
pdppl      4096     934    0      852   106    18    88    96     0     8    6
pvpl        32    12470    0        0   101     0   101   101     0   265    0
pmappl     256      462    0      426     4     1     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      279    0       21     8     0     8     8     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x27:        addq    $0x8,%rsp
x86_ipi_db(ffffffff837ecff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff839a0518) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff839a0518) at __mp_lock+0x192 sys/kern/kern_lock.c:165
intr_handler(ffff800030fff3d0,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
end of kernel
end trace frame: 0x777a5db88340, count: 9
ddb{0}> trace
x86_ipi_db(ffffffff837ecff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff839a0518) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff839a0518) at __mp_lock+0x192 sys/kern/kern_lock.c:165
intr_handler(ffff800030fff3d0,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
end of kernel
end trace frame: 0x777a5db88340, count: -6
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833da8a8) at panic+0x1e5 sys/kern/subr_prf.c:198
pool_do_get(ffffffff839521e0,1,ffff80003c477bf8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1
pool_get(ffffffff839521e0,1) at pool_get+0x149 sys/kern/subr_pool.c:-1
shmget_allocate_segment(ffff80003c47f9d0,ffff80003c477e50,0,ffff80003c477da0) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1
sys_shmget(ffff80003c47f9d0,ffff80003c477e50,ffff80003c477da0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482
syscall(ffff80003c477e50) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c477e50) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x77c39935210, count: 7
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833da8a8) at panic+0x1e5 sys/kern/subr_prf.c:198
pool_do_get(ffffffff839521e0,1,ffff80003c477bf8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1
pool_get(ffffffff839521e0,1) at pool_get+0x149 sys/kern/subr_pool.c:-1
shmget_allocate_segment(ffff80003c47f9d0,ffff80003c477e50,0,ffff80003c477da0) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1
sys_shmget(ffff80003c47f9d0,ffff80003c477e50,ffff80003c477da0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482
syscall(ffff80003c477e50) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c477e50) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x77c39935210, count: -8