syzbot


malloc: free list modified: free (3)

Status: auto-obsoleted due to no activity on 2022/11/04 09:24
Reported-by: syzbot+af88fab27c60ef7edbe3@syzkaller.appspotmail.com
First crash: 859d, last: 859d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd malloc: free list modified: free (4) C 17 22d 518d 0/3 upstream: reported C repro on 2023/07/13 09:12
openbsd malloc: free list modified: free (2) 1 959d 959d 0/3 auto-closed as invalid on 2022/07/27 14:00
openbsd malloc: free list modified: free 12 1658d 1880d 0/3 auto-closed as invalid on 2020/08/26 21:45

Sample crash report:
panic: Data modified on freelist: word 4 of object 0xffff800000c955c0 size 0x38 previous type free (0x0 != 0xdeafbead)

Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*215588  38873      0           0  0x4000000    0K syz-executor.5
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8259bb45) at panic+0x177 sys/kern/subr_prf.c:202
malloc(38,19,1) at malloc+0xa85 sys/kern/kern_malloc.c:363
checkalias(fffffd807bcfa010,31700,0) at checkalias+0x269 sys/kern/vfs_subr.c:586
cdevvp(31700,ffff800025db3d90) at cdevvp+0x98 getdevvp sys/kern/vfs_subr.c:535 [inline]
cdevvp(31700,ffff800025db3d90) at cdevvp+0x98 sys/kern/vfs_subr.c:509
spec_open_clone(ffff800025db3e68) at spec_open_clone+0x193 sys/kern/spec_vnops.c:728
spec_open(ffff800025db3e68) at spec_open+0x3fd sys/kern/spec_vnops.c:153
VOP_OPEN(fffffd806f1f3390,1,fffffd807f7d74e0,ffff80002701ad30) at VOP_OPEN+0x75 sys/kern/vfs_vops.c:138
vn_open(ffff800025db40b8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:180
doopenat(ffff80002701ad30,ffffff9c,20000000,0,0,ffff800025db4290) at doopenat+0x26a sys/kern/vfs_syscalls.c:1131
syscall(ffff800025db4310) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800025db4310) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe6a50e07c80, count: 3
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{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: Data modified on freelist: word 4 of object 0xffff800000c955c0 size 0x38 previous type free (0x0 != 0xdeafbead)

ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8259bb45) at panic+0x177 sys/kern/subr_prf.c:202
malloc(38,19,1) at malloc+0xa85 sys/kern/kern_malloc.c:363
checkalias(fffffd807bcfa010,31700,0) at checkalias+0x269 sys/kern/vfs_subr.c:586
cdevvp(31700,ffff800025db3d90) at cdevvp+0x98 getdevvp sys/kern/vfs_subr.c:535 [inline]
cdevvp(31700,ffff800025db3d90) at cdevvp+0x98 sys/kern/vfs_subr.c:509
spec_open_clone(ffff800025db3e68) at spec_open_clone+0x193 sys/kern/spec_vnops.c:728
spec_open(ffff800025db3e68) at spec_open+0x3fd sys/kern/spec_vnops.c:153
VOP_OPEN(fffffd806f1f3390,1,fffffd807f7d74e0,ffff80002701ad30) at VOP_OPEN+0x75 sys/kern/vfs_vops.c:138
vn_open(ffff800025db40b8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:180
doopenat(ffff80002701ad30,ffffff9c,20000000,0,0,ffff800025db4290) at doopenat+0x26a sys/kern/vfs_syscalls.c:1131
syscall(ffff800025db4310) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800025db4310) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe6a50e07c80, count: -12
ddb{0}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800025db3af0
rbx               0xffffffff82945b97    cpu_info_full_primary+0x2b97
rdx                                0
rcx                                0
rax               0xffff80002701ad30
r8                 0x101010101010101
r9                0x8080808080808080
r10               0x637780ff8a3532a5
r11               0x30d386ba37d2ad94
r12               0xffffffff82945998    cpu_info_full_primary+0x2998
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff810a3548    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800025db3ae0
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.5) pid=215588 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=32, usrpri=86, nice=20
    forw=0xffffffffffffffff, list=0xffff80002701a7f0,0xffff8000ffff22b0
    process=0xffff800021299d28 user=0xffff800025daf000, vmspace=0xfffffd8068e35190
    estcpu=36, cpticks=3, pctcpu=0.0
    user=0, sys=3, intr=0
ddb{0}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 89811  439569  57672      0  2           0                syz-executor.0
 40826  183015  88218      0  2           0                syz-executor.6
 40826  180496  88218      0  2   0x4000000                syz-executor.6
 38873  382903  88056      0  2           0                syz-executor.5
*38873  215588  88056      0  7   0x4000000                syz-executor.5
 44547   97647   1613      0  2           0                syz-executor.1
 44547  315874   1613      0  3   0x4000080  fsleep        syz-executor.1
  3409   30579      1      0  3    0x100083  ttyin         getty
 75122  455958  32445      0  3         0x2  biowait       syz-executor.7
 57850  259986  32445      0  3        0x82  nanoslp       syz-executor.2
  1613  121173  32445      0  3        0x82  nanoslp       syz-executor.1
  6489  283907  32445      0  3         0x2  biowait       syz-executor.3
 79945  191907      0      0  3     0x14200  acct          acct
 30896  290520  32445      0  3         0x2  biowait       syz-executor.4
 88056  106461  32445      0  3        0x82  nanoslp       syz-executor.5
 57672  371942  32445      0  3        0x82  nanoslp       syz-executor.0
 92840  438162      0      0  3     0x14280  nfsidl        nfsio
  8164  262889      0      0  3     0x14280  nfsidl        nfsio
 82182  300295      0      0  3     0x14280  nfsidl        nfsio
 58833  393574      0      0  3     0x14280  nfsidl        nfsio
 66722  111677      0      0  3     0x14280  nfsidl        nfsio
 40896  155260      0      0  3     0x14280  nfsidl        nfsio
 76368   25757      0      0  3     0x14280  nfsidl        nfsio
 35755  211394      0      0  3     0x14280  nfsidl        nfsio
 32814  117340      0      0  3     0x14280  nfsidl        nfsio
 85627  191819      0      0  3     0x14280  nfsidl        nfsio
 35216  456384      0      0  3     0x14280  nfsidl        nfsio
  1511  410964      0      0  3     0x14280  nfsidl        nfsio
 10290  484137      0      0  3     0x14280  nfsidl        nfsio
 90810   60204      0      0  3     0x14280  nfsidl        nfsio
 30870    5951      0      0  3     0x14280  nfsidl        nfsio
 70823  513413      0      0  3     0x14280  nfsidl        nfsio
  4427  164085      0      0  3     0x14280  nfsidl        nfsio
 78859  374138      0      0  3     0x14280  nfsidl        nfsio
 66551  521052      0      0  3     0x14280  nfsidl        nfsio
 93152  248769      0      0  3     0x14280  nfsidl        nfsio
 76658  184746      0      0  3     0x14200  bored         sosplice
 88218  119830  32445      0  3        0x82  nanoslp       syz-executor.6
 32445  410393  84061      0  3        0x82  thrsleep      syz-fuzzer
 32445  398177  84061      0  3   0x4000082  nanoslp       syz-fuzzer
 32445   88950  84061      0  3   0x4000082  thrsleep      syz-fuzzer
 32445  445477  84061      0  3   0x4000082  nanoslp       syz-fuzzer
 32445  320300  84061      0  3   0x4000082  wait          syz-fuzzer
 32445  365105  84061      0  3   0x4000082  thrsleep      syz-fuzzer
 32445   95366  84061      0  3   0x4000082  wait          syz-fuzzer
 32445  516688  84061      0  3   0x4000082  thrsleep      syz-fuzzer
 32445  335073  84061      0  3   0x4000082  wait          syz-fuzzer
 32445  286817  84061      0  3   0x4000082  wait          syz-fuzzer
 32445  122142  84061      0  3   0x4000082  kqread        syz-fuzzer
 32445  266874  84061      0  3   0x4000082  wait          syz-fuzzer
 32445  364364  84061      0  3   0x4000082  thrsleep      syz-fuzzer
 32445  443162  84061      0  3   0x4000082  wait          syz-fuzzer
 32445  453676  84061      0  3   0x4000082  thrsleep      syz-fuzzer
 32445  323636  84061      0  3   0x4000082  wait          syz-fuzzer
 32445  225624  84061      0  3   0x4000082  wait          syz-fuzzer
 84061  245218  46716      0  3    0x10008a  sigsusp       ksh
 46716   29722  42648      0  3        0x9a  kqread        sshd
 42648  281709      1      0  3        0x88  kqread        sshd
 97194    9567  33906     74  3   0x1100092  bpf           pflogd
 33906  117055      1      0  3        0x80  netio         pflogd
 17833  398111  84936     73  3   0x1100090  kqread        syslogd
 84936  161432      1      0  3    0x100082  netio         syslogd
 77973  460033      1      0  3    0x100080  kqread        resolvd
 70073  188998  43500     77  3    0x100092  kqread        dhcpleased
 71075  144794  43500     77  3    0x100092  kqread        dhcpleased
 43500   74599      1      0  3        0x80  kqread        dhcpleased
 71378  488316      0      0  3     0x14200  bored         smr
 37481  232837      0      0  2     0x14200                zerothread
 34539   12151      0      0  3     0x14200  aiodoned      aiodoned
 35163   95182      0      0  3     0x14200  syncer        update
 97707  266932      0      0  3     0x14200  cleaner       cleaner
 24575   93408      0      0  3     0x14200  reaper        reaper
 76235  326592      0      0  3     0x14200  pgdaemon      pagedaemon
 62210  274993      0      0  3     0x14200  bored         viomb
 51207   79247      0      0  3  0x40014200  acpi0         acpi0
 92409   35952      0      0  7  0x40014200                idle1
  4490  467653      0      0  3     0x14200  bored         softnet
 41517  265335      0      0  3     0x14200  bored         softnet
 30299   21123      0      0  3     0x14200  bored         softnet
 99727  415207      0      0  3     0x14200  bored         softnet
 90860  176061      0      0  3     0x14200  bored         systqmp
 40706  300906      0      0  3     0x14200  bored         systq
 53496  432721      0      0  3  0x40014200  bored         softclock
 71085  522269      0      0  3  0x40014200                idle0
     1  343910      0      0  3     0x80082  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 10193   6551K    7124K  78643K     15568        0
            pcb    14      9K      10K  78643K       733        0
         rtable   154     17K      17K  78643K      1024        0
         ifaddr    74     17K      18K  78643K       886        0
         sysctl     2      0K       1K  78643K         6        0
       counters    48     34K      35K  78643K       210        0
       ioctlops     0      0K       4K  78643K      2259        0
            iov     0      0K      36K  78643K       266        0
          mount     1      1K       1K  78643K         1        0
            log     0      0K       0K  78643K         4        0
         vnodes  1333     83K      84K  78643K      3606        0
      UFS quota     1     32K      32K  78643K         1        0
      UFS mount     5     36K      36K  78643K         5        0
            shm     2      1K      17K  78643K        49        0
         VM map     2      1K       1K  78643K         2        0
            sem    12      0K       0K  78643K       151        0
        dirhash    12      2K       2K  78643K        12        0
           ACPI  1697    195K     286K  78643K     12548        0
      file desc    14     49K      81K  78643K      7799        0
          sigio     0      0K       0K  78643K       111        0
           proc    71     91K     139K  78643K      1288        0
        subproc   104      6K       6K  78643K       287        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
    ip_moptions     0      0K       0K  78643K       428        0
       in_multi    46      3K       7K  78643K       407        0
    ether_multi     1      0K       0K  78643K        61        0
            mrt     1      0K       0K  78643K        49        0
    ISOFS mount     1     32K      32K  78643K         1        0
  MSDOSFS mount     1     16K      16K  78643K         1        0
           ttys   115    519K     519K  78643K       115        0
           exec     0      0K       2K  78643K      1350        0
     pfkey data     0      0K       0K  78643K        16        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      62K  78643K         8        0
       UVM amap   289    296K     320K  78643K     39209        0
       UVM aobj    55      2K       2K  78643K        69        0
        memdesc     1      4K       4K  78643K         1        0
    crypto data     1      1K       1K  78643K         1        0
    ip6_options     0      0K       1K  78643K       318        0
            NDP     9      0K       1K  78643K       141        0
           temp   117   4726K    4844K  78643K     57147        0
         kqueue    12     18K      30K  78643K       697        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      326    0      323     3     2     1     3     0     8    0
rtentry    112      300    0      245     6     4     2     4     0     8    0
unpcb      144     1923    0     1908     4     3     1     2     0     8    0
syncache   296       51    0       51     7     7     0     1     0     8    0
tcpqe       32      103    0      103     7     7     0     1     0     8    0
tcpcb      736     1145    0     1141    15    14     1     4     0     8    0
arp        120       47    0       37     1     0     1     1     0     8    0
ipq         40        5    0        4     2     1     1     1     0     8    0
ipqe        40        9    0        8     2     1     1     1     0     8    0
inpcb      320     2952    0     2944    10     6     4     4     0     8    3
nd6         48       74    0       61     2     1     1     1     0     8    0
pkpcb       40       27    0       27     3     3     0     1     0     8    0
kcovpl      48       22    0       14     1     0     1     1     0     8    0
ppxss      1256      19    0       19     4     4     0     1     0     8    0
pfstscr     40      102    0      101     5     4     1     1     0     8    0
pffrag     232        2    0        2     1     1     0     1     0   482    0
pffrnode    88        2    0        2     1     1     0     1     0     8    0
pffrent     40        4    0        4     1     1     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
pfrktable  1344      35    0       26     1     0     1     1     0     8    0
pfanchor   1280     147    0      132     3     0     3     3     0     8    0
pftag       88       16    0        4     1     0     1     1     0     8    0
pfstitem    24       56    0       52     1     0     1     1     0     8    0
pfstkey    120      179    0      175     2     1     1     2     0     8    0
pfstate    336      114    0      111     4     3     1     4     0     8    0
pfrule     1360     235    0      163     7     1     6     6     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256     1337    0     1120    51    37    14    29     0     8    0
art_table   32     1338    0     1120     6     4     2     4     0     8    0
art_node    16      295    0      248     1     0     1     1     0     8    0
sysvmsgpl   40       69    0       29     1     0     1     1     0     8    0
semapl     112      139    0      129     1     0     1     1     0     8    0
shmpl      112       66    0       14     2     0     2     2     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256    11435    0     9980    92     0    92    92     0     8    0
ffsino     272    11435    0     9980    98     0    98    98     0     8    0
nchpl      144    20710    0    19059    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   54050    0    54048     6     5     1     2     0     8    0
percpumem   16      117    0       81     1     0     1     1     0     8    0
vcpupl     2048      15    0        1     2     0     2     2     0     8    0
vmpool     568       19    0        5     3     1     2     2     0     8    0
pfiaddrpl  120      115    0       17     3     0     3     3     0     8    0
kstatmem   264      180    0      162     2     0     2     2     0     8    0
scsiplug    72       13    0       13     3     3     0     1     0     8    0
scxspl     216    70109    0    70106    14    13     1     8     0     8    0
plimitpl   152      275    0      260     1     0     1     1     0     8    0
sigapl     424     8098    0     8031     9     1     8     8     0     8    0
futexpl     64    45040    0    45039     6     5     1     1     0     8    0
knotepl    120      607    0        0    17     0    17    17     0     8    0
kqueuepl   216      949    0      941     1     0     1     1     0     8    0
pipepl     320      506    0      478     3     0     3     3     0     8    0
fdescpl    496     8059    0     8032     5     1     4     5     0     8    0
filepl     152    23597    0    23357    21     9    12    13     0     8    2
lockfpl    104     1185    0     1183     1     0     1     1     0     8    0
lockfspl    48      442    0      440     1     0     1     1     0     8    0
sessionpl  144       40    0       23     1     0     1     1     0     8    0
pgrppl      48       49    0       32     1     0     1     1     0     8    0
ucredpl    104     3023    0     3011     1     0     1     1     0     8    0
zombiepl   144     8032    0     8031     1     0     1     1     0     8    0
processpl  1064    8098    0     8031     5     0     5     5     0     8    0
procpl     672    16442    0    16356    17     8     9     9     0     8    1
srpgc       96       30    0       30     3     3     0     1     0     8    0
sosppl     168       71    0       71     5     5     0     1     0     8    0
sockpl     488     5232    0     5206    23    15     8    12     0     8    4
mcl64k     65536      4    0        0     1     0     1     1     0     8    0
mcl16k     16384      1    0        0     1     0     1     1     0     8    0
mcl12k     12288      3    0        0     1     0     1     1     0     8    0
mcl9k      9216       6    0        0     1     0     1     1     0     8    0
mcl8k      8192       8    0        0     1     0     1     1     0     8    0
mcl4k      4096      13    0        0     2     0     2     2     0     8    0
mcl2k2     2112       5    0        0     1     0     1     1     0     8    0
mcl2k      2048     281    0        0    18     0    18    18     0     8    0
mtagpl      96      185    0        0     4     1     3     4     0     8    0
mbufpl     256      857    0        0    41     0    41    41     0     8    0
bufpl      288    17222    0    10893   453     0   453   453     0     8    0
anonpl      24  1463151    0  1453970   241   161    80   155     0   186    0
amapchunkpl 152  114104    0   113603    52    29    23    32     0   158    0
amappl16   200    25594    0    25340   144   126    18    60     0     8    2
amappl15   192     1547    0     1539     1     0     1     1     0     8    0
amappl14   184      564    0      560     1     0     1     1     0     8    0
amappl13   176     1886    0     1884     1     0     1     1     0     8    0
amappl12   168      729    0      725     1     0     1     1     0     8    0
amappl11   160      693    0      674     1     0     1     1     0     8    0
amappl10   152      678    0      668     1     0     1     1     0     8    0
amappl9    144     2140    0     2133     1     0     1     1     0     8    0
amappl8    136     1338    0     1240     4     0     4     4     0     8    0
amappl7    128      560    0      539     1     0     1     1     0     8    0
amappl6    120     1966    0     1945     2     1     1     2     0     8    0
amappl5    112     6834    0     6815     1     0     1     1     0     8    0
amappl4    104     1920    0     1889     2     0     2     2     0     8    0
amappl3     96    22124    0    22073     2     0     2     2     0     8    0
amappl2     88     3036    0     2995     2     0     2     2     0     8    0
amappl1     80   187361    0   186722    20     4    16    20     0     8    0
amappl      88    38225    0    38073     6     1     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       68    0       14     1     0     1     1     0     8    0
uaddrrnd    24     8078    0     8037     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24     8078    0     8037     1     0     1     1     0     8    0
vmmpekpl   168    43195    0    43123     4     0     4     4     0     8    0
vmmpepl    168   754376    0   752218   199    86   113   150     0   357    5
vmsppl     368     8077    0     8037     9     4     5     5     0     8    0
rwobjpl     56   177321    0   170040   129    23   106   117     0     8    0
pdppl      4096   16163    0    16088   258   175    83    84     0     8    8
pvpl        32  3278454    0  3264715   455   297   158   263     0   265   10
pmappl     248     8077    0     8037     4     1     3     3     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112     1070    0      245    24     0    24    24     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(ffffffff8259bb45) at panic+0x177 sys/kern/subr_prf.c:202
malloc(38,19,1) at malloc+0xa85 sys/kern/kern_malloc.c:363
checkalias(fffffd807bcfa010,31700,0) at checkalias+0x269 sys/kern/vfs_subr.c:586
cdevvp(31700,ffff800025db3d90) at cdevvp+0x98 getdevvp sys/kern/vfs_subr.c:535 [inline]
cdevvp(31700,ffff800025db3d90) at cdevvp+0x98 sys/kern/vfs_subr.c:509
spec_open_clone(ffff800025db3e68) at spec_open_clone+0x193 sys/kern/spec_vnops.c:728
spec_open(ffff800025db3e68) at spec_open+0x3fd sys/kern/spec_vnops.c:153
VOP_OPEN(fffffd806f1f3390,1,fffffd807f7d74e0,ffff80002701ad30) at VOP_OPEN+0x75 sys/kern/vfs_vops.c:138
vn_open(ffff800025db40b8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:180
doopenat(ffff80002701ad30,ffffff9c,20000000,0,0,ffff800025db4290) at doopenat+0x26a sys/kern/vfs_syscalls.c:1131
syscall(ffff800025db4310) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800025db4310) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe6a50e07c80, count: -12
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:178
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:178
end trace frame: 0x0, count: -5

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/08/06 09:23 openbsd 1c702c4a4395 e853abd9 .config console log report ci-openbsd-multicore malloc: free list modified: free
* Struck through repros no longer work on HEAD.