syzbot


witness: userret: ioctl (2)

Status: fixed on 2021/12/08 00:40
Reported-by: syzbot+c773ba1ce9b2d259d27f@syzkaller.appspotmail.com
Fix commit: aa5628258068 Add missing kernel unlock in error path.
First crash: 359d, last: 359d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd witness: userret: ioctl C 3 771d 771d 3/3 fixed on 2020/10/22 20:39
openbsd witness: userret: ioctl (3) syz 2 344d 344d 3/3 fixed on 2021/12/23 16:59

Sample crash report:
witness: userret: returning with the following locks held:
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829f8c18)
#0  witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0  witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1  vmx_mprotect_ept+0x42 sys/arch/amd64/amd64/vmm.c:997
#2  vmmioctl+0x1a2 sys/arch/amd64/amd64/vmm.c:513
#3  VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
#4  vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#5  sys_ioctl+0x4a2
#6  syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6  syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#7  Xsyscall+0x128
panic: witness_warn
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*448718  15000      0           0  0x4000000    0K syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824420f1) at panic+0x177 sys/kern/subr_prf.c:202
witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f witness_debugger sys/kern/subr_witness.c:2505 [inline]
witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f sys/kern/subr_witness.c:1473
userret(ffff800025f667f0) at userret+0x253 sys/kern/kern_sig.c:1952
syscall(ffff800025f6d020) at syscall+0x4a1 mi_syscall_return sys/sys/syscall_mi.h:129 [inline]
syscall(ffff800025f6d020) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:609
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x69fb1b17b90, count: 9
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: witness_warn
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824420f1) at panic+0x177 sys/kern/subr_prf.c:202
witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f witness_debugger sys/kern/subr_witness.c:2505 [inline]
witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f sys/kern/subr_witness.c:1473
userret(ffff800025f667f0) at userret+0x253 sys/kern/kern_sig.c:1952
syscall(ffff800025f6d020) at syscall+0x4a1 mi_syscall_return sys/sys/syscall_mi.h:129 [inline]
syscall(ffff800025f6d020) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:609
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x69fb1b17b90, count: -6
ddb{0}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800025f6cd80
rbx               0xffffffff8276fbff    cpu_info_full_primary+0x2bff
rdx                             0x8b
rcx                              0x2
rax                             0x14
r8                0xffffffff81e8cde4    kprintf+0x144
r9                               0x1
r10               0x7fd11bc4d6e1d487
r11               0x2562289ea329a91e
r12               0xffffffff8276fa00    cpu_info_full_primary+0x2a00
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff823b2108    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800025f6cd70
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=448718 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=32, usrpri=86, nice=20
    forw=0xffffffffffffffff, list=0xffff800025f66a90,0xffffffff829f24e0
    process=0xffff80002573f690 user=0xffff800025f68000, vmspace=0xfffffd807e8f78b8
    estcpu=36, cpticks=5, pctcpu=0.0
    user=0, sys=5, intr=0
ddb{0}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 15000   35370  95188      0  2           0                syz-executor.1
*15000  448718  95188      0  7   0x4000000                syz-executor.1
  7845  203078      1      0  3    0x100083  ttyin         getty
 95188  453407  10543      0  2       0x482                syz-executor.1
 75805   16550  10543      0  2         0x2                syz-executor.0
 33579  488705      0      0  3     0x14280  nfsidl        nfsio
 72212  320267      0      0  3     0x14280  nfsidl        nfsio
 63345  404111      0      0  3     0x14280  nfsidl        nfsio
 20704  185857      0      0  3     0x14280  nfsidl        nfsio
 53209  159945      0      0  3     0x14280  nfsidl        nfsio
 50873  428315      0      0  3     0x14280  nfsidl        nfsio
 25884  286491      0      0  3     0x14280  nfsidl        nfsio
 71089  421131      0      0  3     0x14280  nfsidl        nfsio
  6703  346663      0      0  3     0x14280  nfsidl        nfsio
 26461  295248      0      0  3     0x14280  nfsidl        nfsio
 75019  180438      0      0  3     0x14280  nfsidl        nfsio
 38227  466282      0      0  3     0x14280  nfsidl        nfsio
 92604  260969      0      0  3     0x14280  nfsidl        nfsio
 67346  255803      0      0  3     0x14280  nfsidl        nfsio
 81093  490056      0      0  3     0x14280  nfsidl        nfsio
 38022   21340      0      0  3     0x14280  nfsidl        nfsio
 26145  521925      0      0  3     0x14280  nfsidl        nfsio
 81692  505455      0      0  3     0x14280  nfsidl        nfsio
 88320  497529      0      0  3     0x14280  nfsidl        nfsio
  8344  208197      0      0  3     0x14280  nfsidl        nfsio
  3029   43943      0      0  3     0x14200  acct          acct
  8821  148423      0      0  3     0x14200  bored         sosplice
 10543  150259  57644      0  3        0x82  thrsleep      syz-fuzzer
 10543   40278  57644      0  2   0x4000482                syz-fuzzer
 10543  331688  57644      0  3   0x4000082  thrsleep      syz-fuzzer
 10543  190645  57644      0  2   0x4000482                syz-fuzzer
 10543  184660  57644      0  3   0x4000082  thrsleep      syz-fuzzer
 10543  421351  57644      0  2   0x4000482                syz-fuzzer
 10543  119092  57644      0  3   0x4000082  thrsleep      syz-fuzzer
 10543  149852  57644      0  3   0x4000082  thrsleep      syz-fuzzer
 57644  506255  63505      0  3    0x10008a  sigsusp       ksh
 63505  129343  18001      0  3        0x9a  kqread        sshd
 18001  499618      1      0  3        0x88  kqread        sshd
 93266  279134   3244     74  3    0x100092  bpf           pflogd
  3244  416843      1      0  3        0x80  netio         pflogd
 45051  141011  73140     73  2    0x100090                syslogd
 73140  104518      1      0  3    0x100082  netio         syslogd
 33599  418031      1      0  3    0x100080  kqread        resolvd
  8306   81851      0      0  3     0x14200  bored         smr
  8491  412737      0      0  2     0x14200                zerothread
  1527  499321      0      0  3     0x14200  aiodoned      aiodoned
 94557  247710      0      0  3     0x14200  syncer        update
 44065  314794      0      0  3     0x14200  cleaner       cleaner
 68371  185136      0      0  3     0x14200  reaper        reaper
 32961  218150      0      0  3     0x14200  pgdaemon      pagedaemon
  7822  151625      0      0  3     0x14200  bored         viomb
 19763  497489      0      0  3  0x40014200  acpi0         acpi0
 53043  353545      0      0  7  0x40014200                idle1
  7451  371136      0      0  3     0x14200  bored         softnet
 10642  241488      0      0  3     0x14200  bored         systqmp
 27198  187968      0      0  3     0x14200  bored         systq
 56483  104560      0      0  3  0x40014200  bored         softclock
 81921  482978      0      0  3  0x40014200                idle0
     1  201681      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{0}> show all locks
Process 15000 (syz-executor.1) thread 0xffff800025f667f0 (448718)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829f8c18)
#0  witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0  witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1  vmx_mprotect_ept+0x42 sys/arch/amd64/amd64/vmm.c:997
#2  vmmioctl+0x1a2 sys/arch/amd64/amd64/vmm.c:513
#3  VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
#4  vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#5  sys_ioctl+0x4a2
#6  syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6  syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#7  Xsyscall+0x128
Process 75805 (syz-executor.0) thread 0xffff80002125ed28 (16550)
exclusive rrwlock inode r = 0 (0xfffffd806771a5f0)
#0  witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0  witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1  rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2  rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3  VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
#4  ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140
#5  ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347
#6  ffs_inode_alloc+0x1c3 sys/ufs/ffs/ffs_alloc.c:394
#7  ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162
#8  VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404
#9  domkdirat+0x121 sys/kern/vfs_syscalls.c:3065
#10 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#10 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd80738074e8)
#0  witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0  witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1  rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2  rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3  VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
#4  vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5  vfs_lookup+0xdd sys/kern/vfs_lookup.c:413
#6  namei+0x55a sys/kern/vfs_lookup.c:245
#7  domkdirat+0x75 sys/kern/vfs_syscalls.c:3050
#8  syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8  syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#9  Xsyscall+0x128
ddb{0}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10137   6455K    7434K  78643K     34667        0
            pcb    13      8K       8K  78643K      1200        0
         rtable    63     12K      14K  78643K      2606        0
         ifaddr    48     14K      17K  78643K       900        0
         sysctl     3      1K       1K  78643K         3        0
       counters    44     34K      34K  78643K       334        0
       ioctlops     0      0K       4K  78643K      2743        0
            iov     0      0K      16K  78643K       688        0
          mount     1      1K       1K  78643K         1        0
            log     0      0K       0K  78643K         4        0
         vnodes  1247     78K      79K  78643K      8541        0
      UFS quota     1     32K      32K  78643K         1        0
      UFS mount     5     36K      36K  78643K         5        0
            shm     2      1K       5K  78643K        75        0
         VM map     2      1K       1K  78643K         2        0
            sem    12      0K       1K  78643K      1318        0
        dirhash    12      2K       2K  78643K        12        0
           ACPI  1697    195K     286K  78643K     12598        0
      file desc     5     13K      25K  78643K     10041        0
          sigio     0      0K       0K  78643K        62        0
           proc    64     63K     111K  78643K      1673        0
        subproc    66      4K       4K  78643K      1027        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
    ip_moptions     0      0K       0K  78643K      1069        0
       in_multi     9      0K       2K  78643K      1622        0
    ether_multi     1      0K       0K  78643K       162        0
            mrt     1      0K       0K  78643K        73        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      1799        0
     pfkey data     0      0K       1K  78643K        14        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     7     26K      26K  78643K         7        0
       UVM amap   401    825K     830K  78643K    120665        0
       UVM aobj   131      8K       8K  78643K       150        0
        memdesc     1      4K       4K  78643K         1        0
    crypto data     1      1K       1K  78643K         1        0
    ip6_options     0      0K       1K  78643K      1039        0
            NDP     8      0K       0K  78643K       327        0
           temp    90   4198K    8294K  78643K    131413        0
         kqueue     8     14K      42K  78643K       703        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      651    0      650     1     0     1     1     0     8    0
rtentry    112      927    0      914     4     3     1     2     0     8    0
unpcb      128     3535    0     3527     5     4     1     3     0     8    0
syncache   296       74    0       74    22    22     0     1     0     8    0
tcpqe       32      108  102      108     3     3     0     1     0     8    0
tcpcb      736     3072    0     3046    22    19     3     4     0     8    0
arp        120       99    0       97     1     0     1     1     0     8    0
inpcb      304    10517    0    10500    15    12     3     3     0     8    1
rttmr       72       20    0       20    11    11     0     1     0     8    0
nd6         48      250    0      250     1     1     0     1     0     8    0
pkpcb       40       74    0       74    22    22     0     1     0     8    0
kcovpl      48       31    0       29     1     0     1     1     0     8    0
ppxss      1248      36    0       36    20    19     1     1     0     8    1
pffrag     232       56    0       55    10     9     1     1     0   482    0
pffrnode    88       56    0       55    10     9     1     1     0     8    0
pffrent     40      771    0      770    12    11     1     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      11    0        9     1     0     1     1     0     8    0
pftag       88        2    0        2     1     1     0     1     0     8    0
pfstitem    24       51    0       46     1     0     1     1     0     8    0
pfstkey    112       51    0       46     1     0     1     1     0     8    0
pfstate    320       51    0       46     2     1     1     2     0     8    0
pfrule     1360      32    0       26     2     1     1     2     0     8    0
art_heap8  4096       8    0        6     7     5     2     3     0     8    0
art_heap4  256     4875    0     4856    54    52     2    18     0     8    0
art_table   32     4883    0     4862     4     3     1     3     0     8    0
art_node    16      917    0      909     1     0     1     1     0     8    0
sysvmsgpl   40       34    0       20     1     0     1     1     0     8    0
semupl     112        5    0        5     2     2     0     1     0     8    0
semapl     112     1313    0     1303     1     0     1     1     0     8    0
shmpl      112      147    0       19     4     0     4     4     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256    14020    0    12596    90     0    90    90     0     8    0
ffsino     272    14020    0    12596    96     0    96    96     0     8    0
nchpl      144    27120    0    26656    61    41    20    61     0     8    0
uvmvnodes   72     5926    0        0   108     0   108   108     0     8    0
vnodes     224     5926    0        0   349     0   349   349     0     8    0
namei      1024   87955    0    87954    15    14     1     1     0     8    0
percpumem   16      179    0      145     1     0     1     1     0     8    0
vcpupl     2048      86    0        0    11     0    11    11     0     8    0
vmpool     560       98    0       12     8     1     7     7     0     8    0
pfiaddrpl  120        3    0        2     1     0     1     1     0     8    0
scsiplug    72       10    0       10     7     6     1     1     0     8    1
scxspl     216    83033    0    83033    29    28     1     6     0     8    1
plimitpl   152      624    0      616     1     0     1     1     0     8    0
sigapl     424    10281    0    10230    14     7     7     7     0     8    0
futexpl     64   173984    0   173984    14    13     1     1     0     8    1
knotepl    112      178    0        0     3     0     3     3     0     8    0
kqueuepl   216     2420    0     2405    18    16     2     2     0     8    1
pipepl     336     1385    0     1375    10     8     2     2     0     8    1
fdescpl    496    10204    0    10189     3     0     3     3     0     8    0
filepl     152    58337    0    58207    23    16     7     9     0     8    1
lockfpl    104     2258    0     2257     1     0     1     1     0     8    0
lockfspl    48      766    0      765     1     0     1     1     0     8    0
sessionpl  144       53    0       43     1     0     1     1     0     8    0
pgrppl      48       83    0       73     1     0     1     1     0     8    0
ucredpl     96     6956    0     6945     1     0     1     1     0     8    0
zombiepl   144    10230    0    10230     4     3     1     1     0     8    1
processpl  1072   10281    0    10230     5     1     4     4     0     8    0
procpl     672    22869    0    22810     9     3     6     6     0     8    0
srpgc       96       12    0       12     5     5     0     1     0     8    0
sosppl     168       90    0       90    25    25     0     1     0     8    0
sockpl     480    14845    0    14819    45    39     6    11     0     8    2
mcl64k     65536     20    0        0     3     0     3     3     0     8    0
mcl16k     16384      8    0        0     1     0     1     1     0     8    0
mcl12k     12288     17    0        0     2     0     2     2     0     8    0
mcl9k      9216       6    0        0     1     0     1     1     0     8    0
mcl8k      8192      24    0        0     3     0     3     3     0     8    0
mcl4k      4096      17    0        0     3     1     2     3     0     8    0
mcl2k2     2112       6    0        0     1     0     1     1     0     8    0
mcl2k      2048     459    0        0    38     2    36    36     0     8    0
mtagpl      96      597    0        0     9     0     9     9     0     8    0
mbufpl     256     1521    0        0    76     2    74    74     0     8    0
bufpl      280    23468    0    17139   453     0   453   453     0     8    0
anonpl      24  2735254    0  2717352   275   160   115   129     0   186    6
amapchunkpl 152  303091    0   302423   270   231    39    41     0   158   13
amappl16   200    23879    0    23259   168   134    34    46     0     8    1
amappl15   192      528    0      522     1     0     1     1     0     8    0
amappl14   184     1344    0     1342     1     0     1     1     0     8    0
amappl13   176     1732    0     1730     1     0     1     1     0     8    0
amappl12   168     3774    0     3773     1     0     1     1     0     8    0
amappl11   160     1093    0     1082     1     0     1     1     0     8    0
amappl10   152      871    0      867     1     0     1     1     0     8    0
amappl9    144      558    0      558     2     2     0     1     0     8    0
amappl8    136     1559    0     1480     4     1     3     3     0     8    0
amappl7    128      715    0      708     1     0     1     1     0     8    0
amappl6    120      485    0      472     1     0     1     1     0     8    0
amappl5    112     7590    0     7570     1     0     1     1     0     8    0
amappl4    104     3345    0     3315     1     0     1     1     0     8    0
amappl3     96     5204    0     5188     1     0     1     1     0     8    0
amappl2     88    13844    0    13794     6     4     2     2     0     8    0
amappl1     80   169148    0   168751    15     5    10    13     0     8    0
amappl      88   119560    0   119344     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      64      149    0       19     3     0     3     3     0     8    0
uaddrrnd    24    10302    0    10201     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24    10302    0    10201     1     0     1     1     0     8    0
vmmpekpl   168    52896    0    52843     3     0     3     3     0     8    0
vmmpepl    168   910035    0   908070   520   425    95   119     0   357    0
vmsppl     368    10301    0    10201    11     1    10    10     0     8    0
rwobjpl     56   204055    0   202643    57    36    21    25     0     8    0
pdppl      4096   20612    0    20488   188    61   127   127     0     8    3
pvpl        32  4728034    0  4707729   456   268   188   205     0   265   18
pmappl     224    10301    0    10201     6     0     6     6     0     8    0
extentpl    40       58    0       40     1     0     1     1     0     8    0
phpool     112      636    0      168    14     0    14    14     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:440
panic(ffffffff824420f1) at panic+0x177 sys/kern/subr_prf.c:202
witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f witness_debugger sys/kern/subr_witness.c:2505 [inline]
witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f sys/kern/subr_witness.c:1473
userret(ffff800025f667f0) at userret+0x253 sys/kern/kern_sig.c:1952
syscall(ffff800025f6d020) at syscall+0x4a1 mi_syscall_return sys/sys/syscall_mi.h:129 [inline]
syscall(ffff800025f6d020) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:609
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x69fb1b17b90, count: -6
ddb{0}> machine ddbcpu 1
Stopped at      x86_ipi_db+0x1a:        addq    $0x8,%rsp
x86_ipi_db(ffff800020d38ff0) 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+0x2eb sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020d38ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) 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+0x2eb sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020d38ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -5

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-openbsd-multicore 2021/12/07 07:01 openbsd ad110f3f2f3f 0230ba3e .config log report witness: userret: ioctl
* Struck through repros no longer work on HEAD.