syzbot


uvm_fault: witness_checkorder (6)

Status: upstream: reported on 2025/05/16 22:51
Reported-by: syzbot+94c529af6dd3e483cff6@syzkaller.appspotmail.com
First crash: 383d, last: 10d
Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd uvm_fault: witness_checkorder (3) -1 C 212 996d 1249d 0/3 auto-obsoleted due to no activity on 2023/11/01 12:30
openbsd uvm_fault: witness_checkorder (2) -1 1 2388d 2388d 0/3 auto-closed as invalid on 2020/02/18 09:16
openbsd uvm_fault: witness_checkorder -1 syz 2 2419d 2419d 3/3 fixed on 2019/10/22 13:03
openbsd uvm_fault: witness_checkorder (4) -1 1 924d 924d 0/3 auto-obsoleted due to no activity on 2024/02/21 18:24
openbsd uvm_fault: witness_checkorder (5) -1 7 567d 801d 0/3 auto-obsoleted due to no activity on 2025/02/12 06:16

Sample crash report:
uvm_fault(0xffffffff83aba540, 0xffff80003c50e7f0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at      witness_checkorder+0xb5:        movl    0x20(%r14),%r15d
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 109995  19854      0         0x2          0    0  syz-executor
witness_checkorder(ffff80003c50e7d0,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779
mtx_enter(ffff80003c50e7c0) at mtx_enter+0x95 sys/kern/kern_lock.c:406
filt_procdetach(fffffd806c3eb810) at filt_procdetach+0x4d sys/kern/kern_event.c:432
knote_remove(ffff8000fffe8d18,fffffd806f4ad700,fffffd806f4ad7a0,1,1) at knote_remove+0x1fb sys/kern/kern_event.c:-1
kqueue_purge(ffff8000fffe8d18,fffffd806f4ad700) at kqueue_purge+0x137 sys/kern/kern_event.c:1890
kqueue_close(fffffd806a8d6880,ffff8000fffe8d18) at kqueue_close+0x48 sys/kern/kern_event.c:1934
fdrop(fffffd806a8d6880,ffff8000fffe8d18) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd806a8d6880,ffff8000fffe8d18) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000fffe8d18) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000fffe8d18,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000fffe8d18,ffff800035b90860,ffff800035b907b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff800035b90860) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800035b90860) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e2385160ba0, 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{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: uvm_fault(0xffffffff83aba540, 0xffff80003c50e7f0, 0, 1) -> e
ddb{1}> trace
witness_checkorder(ffff80003c50e7d0,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779
mtx_enter(ffff80003c50e7c0) at mtx_enter+0x95 sys/kern/kern_lock.c:406
filt_procdetach(fffffd806c3eb810) at filt_procdetach+0x4d sys/kern/kern_event.c:432
knote_remove(ffff8000fffe8d18,fffffd806f4ad700,fffffd806f4ad7a0,1,1) at knote_remove+0x1fb sys/kern/kern_event.c:-1
kqueue_purge(ffff8000fffe8d18,fffffd806f4ad700) at kqueue_purge+0x137 sys/kern/kern_event.c:1890
kqueue_close(fffffd806a8d6880,ffff8000fffe8d18) at kqueue_close+0x48 sys/kern/kern_event.c:1934
fdrop(fffffd806a8d6880,ffff8000fffe8d18) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd806a8d6880,ffff8000fffe8d18) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000fffe8d18) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000fffe8d18,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000fffe8d18,ffff800035b90860,ffff800035b907b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff800035b90860) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800035b90860) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e2385160ba0, count: -13
ddb{1}> show registers
rdi                                0
rsi                                0
rbp               0xffff800035b903d0
rbx                                0
rdx                                0
rcx               0xffff8000fffe8d18
rax               0xffff80002999dffe
r8                               0x1
r9                               0x1
r10               0xa044f38038dd4059
r11               0x13468cb7b23b980d
r12               0xffff80003c50e7fe
r13                              0x9
r14               0xffff80003c50e7d0
r15                                0
rip               0xffffffff82801025    witness_checkorder+0xb5
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff800035b90330
ss                              0x10
witness_checkorder+0xb5:        movl    0x20(%r14),%r15d
ddb{1}> show proc
PROC (syz-executor) tid=375423 pid=86220 tcnt=0 stat=onproc
    flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
    runpri=32, usrpri=71, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0xffff8000fffe8d18 scnt=-1 ecnt=1
    forw=0xffffffffffffffff, list=0xffff8000fffe8fb0,0xffff8000fffe8560
    process=0xffff8000fffe49c0 user=0xffff800035b8b000, vmspace=0xfffffd806c6d07b8
    estcpu=21, cpticks=5, pctcpu=0.2, user=0, sys=1, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
  5381   81335  18221      0  2           0                syz-executor
 19050  459874  94348      0  3      0x3000  suspend       syz-executor
 19050  417697  94348      0  2   0x4081000                syz-executor
 93364  439493  45897      0  2           0                syz-executor
 93364   73731  45897      0  3   0x4000080  bpf           syz-executor
 48484  473408      0      0  3     0x14280  nfsidl        nfsio
 53264  353213      0      0  3     0x14280  nfsidl        nfsio
 29062  232330      0      0  3     0x14280  nfsidl        nfsio
 39286  440593      0      0  3     0x14280  nfsidl        nfsio
 50458   94702      0      0  3     0x14280  nfsidl        nfsio
 59303   57732      0      0  3     0x14280  nfsidl        nfsio
 46877  491929      0      0  3     0x14280  nfsidl        nfsio
 72016   39899      0      0  3     0x14280  nfsidl        nfsio
 98411  297751      0      0  3     0x14280  nfsidl        nfsio
  8283  257998      0      0  3     0x14280  nfsidl        nfsio
  6187  347845      0      0  3     0x14280  nfsidl        nfsio
 66585   43178      0      0  3     0x14280  nfsidl        nfsio
 97061  194658      0      0  3     0x14280  nfsidl        nfsio
 10468  211989      0      0  3     0x14280  nfsidl        nfsio
 54300   91535      0      0  3     0x14280  nfsidl        nfsio
 55728  233224      0      0  3     0x14280  nfsidl        nfsio
 18726  383603      0      0  3     0x14280  nfsidl        nfsio
 78597  374998      0      0  3     0x14280  nfsidl        nfsio
 87381  355659      0      0  3     0x14280  nfsidl        nfsio
 25015   14341      0      0  3     0x14280  nfsidl        nfsio
 78052  483410  90500      0  3        0x80  nanoslp       syz-executor
 78052  323361  90500      0  3   0x4000080  fsleep        syz-executor
 78052  192741  90500      0  3   0x4000080  fsleep        syz-executor
 78052  158893  90500      0  3   0x4000080  fsleep        syz-executor
 90500   88542  81319      0  3        0x82  nanoslp       syz-executor
 94348  334883  81319      0  3        0x82  nanoslp       syz-executor
 45897  455189  81319      0  3        0x82  nanoslp       syz-executor
 19854  109995  81319      0  7         0x2                syz-executor
 18221  261130  81319      0  3        0x82  nanoslp       syz-executor
 64865  225296  81319      0  3        0x82  wait          syz-executor
 89905  491308  81319      0  3        0x82  nanoslp       syz-executor
 80094  171922  81319      0  3         0x2  biowait       syz-executor
 81319  381665  13870      0  3        0x82  kqread        syz-executor
 13870  498135  48457      0  3    0x10008a  sigsusp       ksh
 48457  450650  31770      0  3        0x98  kqread        sshd-session
 31770  264146  81958      0  3        0x92  kqread        sshd-session
 74597   23771      1      0  3    0x100083  ttyin         getty
 81958  394838      1      0  3        0x88  kqread        sshd
 79930  268517  41424     74  3   0x1100092  bpf           pflogd
 41424  255409      1      0  3        0x80  sbwait        pflogd
 89963   54336   3560     73  3   0x1100010  biowait       syslogd
  3560  317164      1      0  3    0x100082  sbwait        syslogd
 31437  483409      1      0  3    0x100080  kqread        resolvd
 43846  176514  28907     77  3    0x100092  kqread        dhcpleased
 97015  337037  28907     77  3    0x100092  kqread        dhcpleased
 28907  168674      1      0  3        0x80  kqread        dhcpleased
 99956  250359      0      0  3     0x14200  bored         smr
 58900  443596      0      0  2     0x14200                zerothread
 29315  120113      0      0  3     0x14200  aiodoned      aiodoned
 80878  159135      0      0  3     0x14200  syncer        update
 75010  510666      0      0  3     0x14200  cleaner       cleaner
 60765   98898      0      0  3     0x14200  reaper        reaper
  1666  355183      0      0  3     0x14200  pgdaemon      pagedaemon
 92318   48086      0      0  3     0x14200  bored         viomb
 17832   35022      0      0  3  0x40014200  acpi0         acpi0
 53052  100635      0      0  3  0x40014200                idle1
 97003  337409      0      0  3     0x14200  bored         softnet1
 56977  128781      0      0  3     0x14200  bored         softnet0
   795  212286      0      0  3     0x14200  bored         systqmp
 98571  284194      0      0  3     0x14200  bored         systq
 25505   58729      0      0  3     0x14200  tmoslp        softclockmp
 17547  110877      0      0  3  0x40014200  tmoslp        softclock
 65315   50172      0      0  3  0x40014200                idle0
     1  490181      0      0  3        0x82  wait          init
     0       0     -1      0  3  0x10010200  scheduler     swapper
ddb{1}> show all locks
Process 19854 (syz-executor) thread 0xffff80002a241a08 (109995)
exclusive rrwlock inode r = 0 (0xfffffd806c5168e0)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2  rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4  vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5  vget+0x2a2 sys/kern/vfs_subr.c:686
#6  ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98
#7  ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203
#8  ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478
#9  VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#11 namei+0x7c5 sys/kern/vfs_lookup.c:250
#12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1893
#13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806ccb20b8)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2  rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4  vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5  vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
#6  namei+0x7c5 sys/kern/vfs_lookup.c:250
#7  dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1893
#8  syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8  syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9  Xsyscall+0x128
Process 80094 (syz-executor) thread 0xffff80002a223c98 (171922)
exclusive rrwlock inode r = 0 (0xfffffd806c5161f0)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2  rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4  vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5  vget+0x2a2 sys/kern/vfs_subr.c:686
#6  ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98
#7  ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203
#8  ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478
#9  VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#11 namei+0x7c5 sys/kern/vfs_lookup.c:250
#12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1893
#13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806d73c1d8)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2  rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4  vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5  vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
#6  namei+0x7c5 sys/kern/vfs_lookup.c:250
#7  dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1893
#8  syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8  syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9  Xsyscall+0x128
Process 89963 (syslogd) thread 0xffff80002a2234d0 (54336)
exclusive rrwlock inode r = 0 (0xfffffd806eb5f6c8)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2  rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4  vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5  sys_fsync+0x144 sys/kern/vfs_syscalls.c:2976
#6  syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6  syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#7  Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 11067  12102K   13990K 166960K     12728        0
            pcb    17     13K      14K 166960K       116        0
         rtable   240      9K       9K 166960K       396        0
             pf    34     17K      81K 166960K       104        0
         ifaddr    40      7K       7K 166960K        53        0
        ifgroup    51      2K       2K 166960K        71        0
         sysctl     2      1K       9K 166960K         7        0
       counters    68     36K      37K 166960K        88        0
       ioctlops     0      0K       4K 166960K      1512        0
            iov     0      0K      16K 166960K         3        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1423     89K      90K 166960K      1699        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       9K 166960K         8        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    16     57K     110K 166960K       277        0
           proc    72    115K     180K 166960K       567        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        19        0
       in_multi    88      6K       7K 166960K       106        0
    ether_multi     1      0K       0K 166960K         3        0
            mrt     0      0K       0K 166960K         6        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys    55    254K     254K 166960K        55        0
           exec     0      0K       1K 166960K       408        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   219    159K     169K 166960K      4218        0
       UVM aobj     6      2K       2K 166960K         7        0
     pinsyscall    41     82K     100K 166960K      1429        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     0      0K       0K 166960K         3        0
            NDP    11      0K       1K 166960K        33        0
           temp    40   9111K    9178K 166960K     11833        0
         kqueue    15     22K      28K 166960K        55        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       40    0       37     1     0     1     1     0     8    0
rtentry    176      118    0       14     6     0     6     6     0     8    0
unpcb      144       79    0       62     1     0     1     1     0     8    0
syncache   336        5    0        5     1     1     0     1     0     8    0
tcpcb      736      112    0      107     7     1     6     7     0     8    5
arp        136       19    0        2     1     0     1     1     0     8    0
ipq         40        1    0        1     1     0     1     1     0     8    1
ipqe        40        3    0        3     1     0     1     1     0     8    1
inpcb      328      379    0      370     7     0     7     7     0     8    5
nd6        152       27    0        5     2     0     2     2     0     8    1
pkpcb       40       34    0       34     1     1     0     1     0     8    0
kcovpl      48        8    0        0     1     0     1     1     0     8    0
ppxss      1192       7    0        7     1     0     1     1     0     8    1
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       3    0        1     1     0     1     1     0     8    0
pfanchor   1288      12    0        0     1     0     1     1     0     8    0
pfstitem    24       44    0        0     1     0     1     1     0     8    0
pfstkey    128       44    0        0     2     0     2     2     0     8    0
pfstate    448       43    0        0     5     0     5     5     0     8    0
pfrule     1360      24    0       18     2     1     1     2     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      521    0       68    32     0    32    32     0     8    2
art_table   40      522    0       68     6     0     6     6     0     8    0
art_node    32      118    0       23     1     0     1     1     0     8    0
sysvmsgpl   40        2    0        2     1     0     1     1     0     8    1
semupl     112        1    0        1     1     0     1     1     0     8    1
semapl      72        5    0        0     1     0     1     1     0     8    0
shmpl      112        4    0        1     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1870    0      404    93     0    93    93     0     8    0
ffsino     296     1870    0      404   114     0   114   114     0     8    0
nchpl      144     2257    0      555    64     0    64    64     0     8    0
rtmask      32        4    0        4     1     0     1     1     0     8    1
vnodes     216     2194    0        0   122     0   122   122     0     8    0
namei      1024    7617    0     7617     1     0     1     1     0     8    1
percpumem   16       59    0       10     1     0     1     1     0     8    0
pfiaddrpl  120        1    0        0     1     0     1     1     0     8    0
kstatmem   264       37    0       12     2     0     2     2     0     8    0
scsiplug    72        1    0        1     1     0     1     1     0     8    1
scxspl     216     7716    0     7714     4     3     1     3     1     8    0
plimitpl   152       43    0       24     1     0     1     1     0     8    0
sigapl     424      788    0      722    29     3    26    28     0     8   17
knotepl    120      560    0        0    17     0    17    17     0     8    0
kqueuepl   224       99    0       89     3     0     3     3     0     8    2
pipepl     344      139    0      112     3     0     3     3     0     8    0
fdescpl    528      572    0      542     3     0     3     3     0     8    0
filepl     160     3285    0     3062    13     0    13    13     0     8    3
lockfpl    104       73    0       69     1     0     1     1     0     8    0
lockfspl    48       37    0       33     1     0     1     1     0     8    0
sessionpl  144       65    0       56     1     0     1     1     0     8    0
pgrppl      48       76    0       59     1     0     1     1     0     8    0
ucredpl    104      402    0      389     1     0     1     1     0     8    0
zombiepl   144      725    0      722     6     0     6     6     0     8    5
processpl  1232     788    0      722    20     1    19    20     0     8   11
procpl     664     1028    0      957    22     6    16    22     0     8    8
sosppl     176        1    0        1     1     0     1     1     0     8    1
sockpl     752      542    0      513    11     0    11    11     0     8    7
mcl64k     65536      2    0        0     1     0     1     1     0     8    0
mcl16k     16384      4    0        0     1     0     1     1     0     8    0
mcl8k      8192       3    0        0     1     0     1     1     0     8    0
mcl4k      4096     112    0        0    14     0    14    14     0     8    0
mcl2k      2048      27    0        0     4     0     4     4     0     8    0
mtagpl      96        2    0        0     1     0     1     1     0     8    0
mbufpl     256      207    0        0    13     0    13    13     0     8    0
bufpl      280     2730    0      105   188     0   188   188     0     8    0
anonpl      32     5537    0        0    46     1    45    45     0   246    0
amapchunkpl 152   11865    0    11427    26     0    26    26     0   158    6
amappl16   200      761    0      738     4     1     3     3     0     8    1
amappl15   192       17    0       17     1     1     0     1     0     8    0
amappl14   184      431    0      430     1     0     1     1     0     8    0
amappl13   176      119    0      107     1     0     1     1     0     8    0
amappl12   168      836    0      807     2     0     2     2     0     8    0
amappl11   160        7    0        7     2     2     0     1     0     8    0
amappl10   152       60    0       46     1     0     1     1     0     8    0
amappl9    144      300    0      300     1     1     0     1     0     8    0
amappl8    136       98    0       96     1     0     1     1     0     8    0
amappl7    128      146    0      133     1     0     1     1     0     8    0
amappl6    120      154    0      152     1     0     1     1     0     8    0
amappl5    112       97    0       86     1     0     1     1     0     8    0
amappl4    104      306    0      287     1     0     1     1     0     8    0
amappl3     96     2381    0     2277     4     0     4     4     0     8    1
amappl2     88      540    0      479     2     0     2     2     0     8    0
amappl1     80    10958    0    10346    14     1    13    14     0     8    0
amappl      88     3476    0     3328     5     0     5     5     0    92    1
uvmvnodes   80      107    0        0     3     0     3     3     0     8    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      254    0      254     2     1     1     1     0     8    1
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       19    0       18     1     0     1     1     0     8    0
aobjpl      72        6    0        1     1     0     1     1     0     8    0
uaddrrnd    24      572    0      542     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      572    0      542     1     0     1     1     0     8    0
vmmpekpl   168     7140    0     7086     4     0     4     4     0     8    0
vmmpepl    168    44056    0    42198    88     0    88    88     0   357    1
vmsppl     488      571    0      542     5     1     4     5     0     8    0
rwobjpl     80    14815    0    13781    23     0    23    23     0     8    0
pdppl      4096    1151    0     1084    95    24    71    83     0     8    4
pvpl        32    14612    0        0   119     1   118   118     0   265    0
pmappl     256      571    0      542     3     0     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      280    0       29     8     0     8     8     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x27:        addq    $0x8,%rsp
x86_ipi_db(ffffffff83913ff0) 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(ffffffff839e5780) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff839e5780) at __mp_lock+0x192 sys/kern/kern_lock.c:173
__mp_acquire_count(ffffffff839e5780,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369
biowait(fffffd806d558b18) at biowait+0xc6 sys/kern/vfs_bio.c:1242
bwrite(fffffd806d558b18) at bwrite+0x2e7 sys/kern/vfs_bio.c:754
ufs_dirremove(fffffd806cb71118,fffffd806c516840,800c,1) at ufs_dirremove+0x290 sys/ufs/ufs/ufs_lookup.c:919
ufs_rmdir(ffff80002a324690) at ufs_rmdir+0x238 sys/ufs/ufs/ufs_vnops.c:1248
VOP_RMDIR(fffffd806cb71118,fffffd8069c53528,ffff80002a324768) at VOP_RMDIR+0x192 sys/kern/vfs_vops.c:413
dounlinkat(ffff80002a241a08,ffffff9c,7b258d2e8070,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1926
syscall(ffff80002a3248e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3248e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b258d2e8060, count: 1
ddb{0}> trace
x86_ipi_db(ffffffff83913ff0) 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(ffffffff839e5780) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff839e5780) at __mp_lock+0x192 sys/kern/kern_lock.c:173
__mp_acquire_count(ffffffff839e5780,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369
biowait(fffffd806d558b18) at biowait+0xc6 sys/kern/vfs_bio.c:1242
bwrite(fffffd806d558b18) at bwrite+0x2e7 sys/kern/vfs_bio.c:754
ufs_dirremove(fffffd806cb71118,fffffd806c516840,800c,1) at ufs_dirremove+0x290 sys/ufs/ufs/ufs_lookup.c:919
ufs_rmdir(ffff80002a324690) at ufs_rmdir+0x238 sys/ufs/ufs/ufs_vnops.c:1248
VOP_RMDIR(fffffd806cb71118,fffffd8069c53528,ffff80002a324768) at VOP_RMDIR+0x192 sys/kern/vfs_vops.c:413
dounlinkat(ffff80002a241a08,ffffff9c,7b258d2e8070,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1926
syscall(ffff80002a3248e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3248e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b258d2e8060, count: -14
ddb{0}> machine ddbcpu 1
Stopped at      witness_checkorder+0xb5:        movl    0x20(%r14),%r15d
witness_checkorder(ffff80003c50e7d0,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779
mtx_enter(ffff80003c50e7c0) at mtx_enter+0x95 sys/kern/kern_lock.c:406
filt_procdetach(fffffd806c3eb810) at filt_procdetach+0x4d sys/kern/kern_event.c:432
knote_remove(ffff8000fffe8d18,fffffd806f4ad700,fffffd806f4ad7a0,1,1) at knote_remove+0x1fb sys/kern/kern_event.c:-1
kqueue_purge(ffff8000fffe8d18,fffffd806f4ad700) at kqueue_purge+0x137 sys/kern/kern_event.c:1890
kqueue_close(fffffd806a8d6880,ffff8000fffe8d18) at kqueue_close+0x48 sys/kern/kern_event.c:1934
fdrop(fffffd806a8d6880,ffff8000fffe8d18) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd806a8d6880,ffff8000fffe8d18) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000fffe8d18) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000fffe8d18,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000fffe8d18,ffff800035b90860,ffff800035b907b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff800035b90860) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800035b90860) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e2385160ba0, count: 2
ddb{1}> trace
witness_checkorder(ffff80003c50e7d0,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779
mtx_enter(ffff80003c50e7c0) at mtx_enter+0x95 sys/kern/kern_lock.c:406
filt_procdetach(fffffd806c3eb810) at filt_procdetach+0x4d sys/kern/kern_event.c:432
knote_remove(ffff8000fffe8d18,fffffd806f4ad700,fffffd806f4ad7a0,1,1) at knote_remove+0x1fb sys/kern/kern_event.c:-1
kqueue_purge(ffff8000fffe8d18,fffffd806f4ad700) at kqueue_purge+0x137 sys/kern/kern_event.c:1890
kqueue_close(fffffd806a8d6880,ffff8000fffe8d18) at kqueue_close+0x48 sys/kern/kern_event.c:1934
fdrop(fffffd806a8d6880,ffff8000fffe8d18) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd806a8d6880,ffff8000fffe8d18) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000fffe8d18) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000fffe8d18,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000fffe8d18,ffff800035b90860,ffff800035b907b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff800035b90860) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800035b90860) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e2385160ba0, count: -13

Crashes (92):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/25 05:54 openbsd 3ca1fbf96c86 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/05/23 03:33 openbsd dbd5cf8c5e8a c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-setuid uvm_fault: witness_checkorder
2026/04/14 15:28 openbsd 84c70f1e56c7 1a086e7c .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/04/13 15:44 openbsd 380397a6e914 9530ccf9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/29 22:27 openbsd 7ab78e8bd090 4b3d9a38 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/24 07:08 openbsd 2084961b940b baf8bf12 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/23 18:06 openbsd ccfcb3e6ef18 5e3db351 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/21 00:55 openbsd 65032adb4937 85bf2a64 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/20 17:53 openbsd 65032adb4937 85bf2a64 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/18 19:53 openbsd 561bf2d2294a 0199f9a1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/18 01:58 openbsd 7b59c65f5490 c8810548 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/17 09:36 openbsd 5eccae830399 0737c18f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/03/11 10:51 openbsd 177cf78f1bc3 b4075e21 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/02/07 03:37 openbsd 468b83701423 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/02/07 01:05 openbsd 468b83701423 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/02/06 19:06 openbsd 468b83701423 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/02/03 15:57 openbsd 72466e384590 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/02/01 03:37 openbsd 43ad07ab5076 6b8752f2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/31 13:15 openbsd 3729e22e7105 afc0c4d4 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/27 14:12 openbsd 4b649cda673b 71ad32b1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/26 21:17 openbsd 4c8dfe351ad4 a4c52dd6 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/25 13:44 openbsd f99cc216b56b 40acda8a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/25 05:20 openbsd 12762e433761 40acda8a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/20 01:05 openbsd deb62df5ff8f 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/15 14:54 openbsd c600931321c7 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/15 05:30 openbsd ac9e191703f1 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/14 16:15 openbsd bf518416d64f 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/13 11:59 openbsd 67ddd48175b9 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/07 18:58 openbsd b6bc6e61f2e3 15f6fd08 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/06 14:39 openbsd 4459f914e6b0 15f6fd08 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2026/01/04 01:34 openbsd 80bc9799356e e3fbc05e .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/12/23 16:27 openbsd c8ac761eb131 5dc09de1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/12/23 08:32 openbsd c8ac761eb131 607f1549 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/12/17 01:52 openbsd 3a6d4b98bde9 a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/12/12 08:15 openbsd 6168265ddf60 a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/12/01 11:42 openbsd 6bf0f93af4a8 01c07bfe .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/12/01 08:03 openbsd 6bf0f93af4a8 01c07bfe .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/11/30 11:14 openbsd 0086034dedf2 01c07bfe .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/11/30 05:58 openbsd 0086034dedf2 01c07bfe .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/11/27 17:15 openbsd 7de01a79e4ba e8331348 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/11/22 00:44 openbsd 16f4e75c8e57 4fb8ef37 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/11/18 17:08 openbsd ae8b598acb72 ef766cd7 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/11/18 12:34 openbsd ae8b598acb72 ef766cd7 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/11/18 04:38 openbsd 8720e5dd1696 ef766cd7 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/06/24 19:05 openbsd b3c44d07fb7e 26d77996 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/06/24 19:05 openbsd b3c44d07fb7e 26d77996 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/06/21 02:07 openbsd f62159b6a996 d6cdfb8a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/06/09 08:17 openbsd 1d858eebbab4 4826c28e .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/06/09 02:28 openbsd 1d858eebbab4 4826c28e .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/06/05 20:40 openbsd c875838447ad 6b6b5f21 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/05/18 21:36 openbsd 6decc3d5f4d6 f41472b0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
2025/05/16 22:51 openbsd f47d9bee1200 f41472b0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: witness_checkorder
* Struck through repros no longer work on HEAD.