syzbot


witness: reversal: lock order data missing (5)

Status: upstream: reported on 2025/02/03 09:07
Reported-by: syzbot+6e45b18b14156f1df9f4@syzkaller.appspotmail.com
First crash: 390d, last: 14d
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd witness: reversal: lock order data missing (2) -1 C 173 1602d 1751d 0/3 closed as invalid on 2022/02/22 18:44
openbsd witness: reversal: lock order data missing (3) -1 8192 598d 1446d 3/3 fixed on 2024/07/10 22:52
openbsd witness: reversal: lock order data missing (4) -1 57671 465d 598d 0/3 auto-obsoleted due to no activity on 2025/01/09 12:07
openbsd witness: reversal: lock order data missing -1 C 667 1752d 1822d 3/3 fixed on 2021/05/14 01:59

Sample crash report:
witness: lock order reversal:
 1st 0xffff8000015fd120 sbufsnd (&so->so_snd.sb_lock)
 2nd 0xfffffd806c925a28 inode (&ip->i_lock)
lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock)
lock order data 0xffffffff8341328d -> 0xffffffff83386825 is missing
lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock)
#0  rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
#1  sblock+0xb6 sys/kern/uipc_socket2.c:536
#2  soreceive+0x27d sys/kern/uipc_socket.c:890
#3  fifo_read+0x117 sys/miscfs/fifofs/fifo_vnops.c:264
#4  VOP_READ+0x101 sys/kern/vfs_vops.c:227
#5  vn_rdwr+0x15b sys/kern/vfs_vnops.c:-1
#6  vndsetcred+0xa1 sys/dev/vnd.c:685
#7  vndioctl+0xdfc sys/dev/vnd.c:486
#8  VOP_IOCTL+0xac sys/kern/vfs_vops.c:264
#9  vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531
#10 sys_ioctl+0x674 sys/kern/sys_generic.c:-1
#11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#12 Xsyscall+0x128
lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock)
#0  rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
#1  sblock+0xb6 sys/kern/uipc_socket2.c:536
#2  sosplice+0x312 sys/kern/uipc_socket.c:1347
#3  sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1227
#4  syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4  syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#5  Xsyscall+0x128
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
the kernel did not panic
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
witness_checkorder(fffffd806c925a28,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806c925a10,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffd806c925a10,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8069f7c1d0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd8069f7c1d0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_lookup(ffff80003c504e50) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1
namei(ffff80003c504e50) at namei+0x7ca sys/kern/vfs_lookup.c:250
unp_connect(ffff8000015fcf38,fffffd806f362800,ffff80003abf87e8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872
uipc_dgram_send(ffff8000015fcf38,fffffd806d5e3100,fffffd806f362800,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609
sosend(ffff8000015fcf38,fffffd806f362800,ffff80003c5050d8,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff80003abf87e8,6,ffff80003c505258,e,ffff80003c505310) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785
sys_sendmsg(ffff80003abf87e8,ffff80003c5053c0,ffff80003c505310) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603
syscall(ffff80003c5053c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c5053c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5f7cfe6d0a0, count: -15
ddb{1}> show registers
rdi                                0
rsi                          0x80000    acpi_pdirpa+0x6be71
rbp               0xffff80003c504ac0
rbx                                0
rdx               0xffff800001590b40
rcx               0xffff80003abf87e8
rax                          0x7ffff    acpi_pdirpa+0x6be70
r8                0xffff80003c5049a0
r9                0x8080808080808080
r10               0x190a2cbb2ec05bf5
r11               0x32235e36b856b325
r12               0xfffffd8003f548c0
r13               0xfffffd800473c350
r14                              0x3
r15               0xffffffff83421d15    substchar+0x68ae
rip               0xffffffff82eec745    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80003c504ab0
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=59393 pid=21591 tcnt=2 stat=onproc
    flags process=10<SUGID> proc=4000000<THREAD>
    runpri=32, usrpri=50, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80003abf8a80,0xffff80003c4c6d40
    process=0xffff80003c4009c8 user=0xffff80003c500000, vmspace=0xfffffd806c9697b8
    estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 96053  484452  33993      0  2           0                syz-executor
 21591  390287  64524  60929  2        0x10                syz-executor
*21591   59393  64524  60929  7   0x4000010                syz-executor
 12897  115660   6476     -1  7        0x10                syz-executor
 12897  310618   6476     -1  3   0x4000090  fsleep        syz-executor
 12897  424105   6476     -1  2   0x4000010                syz-executor
 15508  436471  94995      0  2           0                syz-executor
 15508  270667  94995      0  2   0x4000000                syz-executor
 73095  490377  58376      0  2           0                syz-executor
 73095  397738  58376      0  3   0x4000080  fsleep        syz-executor
 73095  220771  58376      0  2   0x4000000                syz-executor
 68159   98503  33644      0  2           0                syz-executor
 68159  402348  33644      0  3   0x4000080  fsleep        syz-executor
 21192  267787  64064      0  2           0                syz-executor
 21192  127303  64064      0  3   0x4000080  fsleep        syz-executor
 25239   20610   5885      0  2           0                syz-executor
 25239  461188   5885      0  3   0x4000080  fsleep        syz-executor
 40328   75276      0      0  3     0x14200  acct          acct
 94995  469320  38431      0  3        0x82  nanoslp       syz-executor
 97252  449863      0      0  3     0x14280  nfsidl        nfsio
 91931   67610      0      0  3     0x14280  nfsidl        nfsio
 41883  134465      0      0  3     0x14280  nfsidl        nfsio
 85636  283321      0      0  3     0x14280  nfsidl        nfsio
 77955  112450      0      0  3     0x14280  nfsidl        nfsio
 52754  494798      0      0  3     0x14280  nfsidl        nfsio
 24264  178343      0      0  3     0x14280  nfsidl        nfsio
 95062  108850      0      0  3     0x14280  nfsidl        nfsio
 84584   28321      0      0  3     0x14280  nfsidl        nfsio
 97618   93966      0      0  3     0x14280  nfsidl        nfsio
 76276  158567      0      0  3     0x14280  nfsidl        nfsio
 54614  123391      0      0  3     0x14280  nfsidl        nfsio
 66636   69418      0      0  3     0x14280  nfsidl        nfsio
 11594  435000      0      0  3     0x14280  nfsidl        nfsio
  5928  431105      0      0  3     0x14280  nfsidl        nfsio
 15525  177701      0      0  3     0x14280  nfsidl        nfsio
 31749  507134      0      0  3     0x14280  nfsidl        nfsio
 82404  134335      0      0  3     0x14280  nfsidl        nfsio
 96205  262918      0      0  3     0x14280  nfsidl        nfsio
 10757  407022      0      0  3     0x14280  nfsidl        nfsio
 75839   72593      1      0  3    0x100083  ttyin         getty
 64524  428986  38431      0  3        0x82  nanoslp       syz-executor
 33644  288778  38431      0  3        0x82  nanoslp       syz-executor
 33993  215891  38431      0  3        0x82  nanoslp       syz-executor
  5885  380199  38431      0  3        0x82  nanoslp       syz-executor
  6476  211148  38431      0  3        0x82  nanoslp       syz-executor
 58376  470964  38431      0  3        0x82  nanoslp       syz-executor
 64064  350374  38431      0  2         0x2                syz-executor
 38431  179915  81634      0  3        0x82  kqread        syz-executor
 81634  275688  80022      0  3    0x10008a  sigsusp       ksh
 80022  129512  63673      0  3        0x98  kqread        sshd-session
 63673  318815   8431      0  3        0x92  kqread        sshd-session
  8431  325111      1      0  3        0x88  kqread        sshd
 11156    7403  12803     74  3   0x1100092  bpf           pflogd
 12803  353882      1      0  3        0x80  sbwait        pflogd
 64207  461622  67328     73  3   0x1100090  kqread        syslogd
 67328  200037      1      0  3    0x100082  sbwait        syslogd
 83361  194837      1      0  3    0x100080  kqread        resolvd
 97080  450803   9245     77  3    0x100092  kqread        dhcpleased
 45418  461525   9245     77  3    0x100092  kqread        dhcpleased
  9245   38087      1      0  3        0x80  kqread        dhcpleased
 14372   27096      0      0  3     0x14200  bored         smr
 54446  127781      0      0  2     0x14200                zerothread
 20787   15532      0      0  3     0x14200  aiodoned      aiodoned
 89628  313734      0      0  3     0x14200  syncer        update
 40016  436461      0      0  3     0x14200  cleaner       cleaner
  6621  480522      0      0  3     0x14200  reaper        reaper
 55279  264998      0      0  3     0x14200  pgdaemon      pagedaemon
 29940   72366      0      0  3     0x14200  bored         viomb
 35826  281117      0      0  3  0x40014200  acpi0         acpi0
 14114  295162      0      0  3  0x40014200                idle1
 41108   87551      0      0  3     0x14200  bored         softnet1
  2796  454753      0      0  2     0x14200                softnet0
 18279  497185      0      0  3     0x14200  bored         systqmp
 43189  417829      0      0  3     0x14200  bored         systq
    65  140128      0      0  3     0x14200  tmoslp        softclockmp
 33680  442268      0      0  3  0x40014200  tmoslp        softclock
 55302  274566      0      0  3  0x40014200                idle0
     1   31622      0      0  3        0x82  wait          init
     0       0     -1      0  3  0x10010200  scheduler     swapper
ddb{1}> show all locks
Process 21591 (syz-executor) thread 0xffff80003abf87e8 (59393)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838d2580)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  unp_connect+0x28c sys/kern/uipc_usrreq.c:872
#2  uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609
#3  sosend+0x804 sys/kern/uipc_socket.c:-1
#4  sendit+0x5a5 sys/kern/uipc_syscalls.c:785
#5  sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603
#6  syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6  syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#7  Xsyscall+0x128
exclusive rwlock sbufsnd r = 0 (0xffff8000015fd120)
#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  sblock+0xb6 sys/kern/uipc_socket2.c:536
#3  sosend+0x2e9 sys/kern/uipc_socket.c:639
#4  sendit+0x5a5 sys/kern/uipc_syscalls.c:785
#5  sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603
#6  syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6  syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#7  Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 11068  12191K   12366K 166960K     12792        0
            pcb    17     12K      12K 166960K       133        0
         rtable   237     12K      12K 166960K       488        0
             pf    41     19K      21K 166960K       111        0
         ifaddr    40      7K       8K 166960K        82        0
        ifgroup    55      2K       2K 166960K       128        0
         sysctl     4      1K       9K 166960K        16        0
       counters    70     37K      38K 166960K       156        0
       ioctlops     0      0K       4K 166960K      1572        0
            iov     0      0K      24K 166960K        95        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1426     90K      90K 166960K      2008        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       5K 166960K         3        0
         VM map     2      1K       1K 166960K         2        0
            sem    12      0K       1K 166960K        26        0
        dirhash    12      2K       3K 166960K        30        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    18     65K      89K 166960K       680        0
          sigio     1      0K       0K 166960K         7        0
           proc    72    115K     164K 166960K       606        0
        subproc    72      4K       4K 166960K        81        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     16K      16K 166960K         1        0
    ip_moptions     2      0K       0K 166960K        71        0
       in_multi    86      6K       7K 166960K       132        0
    ether_multi     1      0K       0K 166960K         6        0
            mrt     1      0K       0K 166960K        13        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys    85    387K     387K 166960K        85        0
           exec     0      0K       1K 166960K       443        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   236    167K     182K 166960K      8099        0
       UVM aobj    13      8K       8K 166960K        13        0
     pinsyscall    43     86K     102K 166960K      1864        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     0      0K       0K 166960K        57        0
            NDP    12      0K       1K 166960K        53        0
           temp    50   8681K    8752K 166960K     42508        0
         kqueue    13     20K      31K 166960K       141        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       60    0       57     1     0     1     1     0     8    0
rtentry    176      140    0       46     6     0     6     6     0     8    0
unpcb      144      467    0      444     9     5     4     6     0     8    3
syncache   336        9    0        9     2     1     1     1     0     8    1
tcpcb      736      207    0      203     7     0     7     7     0     8    6
arp        136       22    0        3     1     0     1     1     0     8    0
inpcb      328      599    0      590     8     1     7     7     0     8    5
nd6        152       30    0        6     2     0     2     2     0     8    0
pkpcb       40        6    0        6     2     1     1     1     0     8    1
kcovpl      48        9    0        1     1     0     1     1     0     8    0
mppekey    1024       2    0        2     2     1     1     1     0     8    1
ppxss      1192      32    0       32     2     1     1     1     0     8    1
pppxif     1504       6    0        6     2     1     1     1     0     8    1
pfstscr     40        2    0        2     1     1     0     1     0     8    0
pffrag     232        6    0        2     1     0     1     1     0   482    0
pffrnode    88        4    0        0     1     0     1     1     0     8    0
pffrent     40       13    0        9     1     0     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       7    0        3     2     1     1     1     0     8    0
pfanchor   1288       1    0        0     1     0     1     1     0     8    0
pftag       88        2    0        0     1     0     1     1     0     8    0
pfstitem    24        4    0        0     1     0     1     1     0     8    0
pfstkey    128       10    0        6     2     1     1     1     0     8    0
pfstate    448        5    0        3     2     1     1     1     0     8    0
pfrule     1360       3    0        2     1     0     1     1     0     8    0
rttmr      136        2    0        2     2     1     1     1     0     8    1
art_heap8  4096       2    0        0     2     0     2     2     0     8    0
art_heap4  256      624    0      237    30     3    27    30     0     8    2
art_table   40      626    0      237     5     0     5     5     0     8    0
art_node    32      140    0       55     1     0     1     1     0     8    0
sysvmsgpl   40        8    0        7     2     1     1     1     0     8    0
semapl     112       20    0       10     1     0     1     1     0     8    0
shmpl      112        8    0        0     1     0     1     1     0     8    0
dirhash    1024      29    0       12     3     0     3     3     0     8    0
dino2pl    256     2664    0     1155    96     0    96    96     0     8    0
ffsino     296     2664    0     1155   118     0   118   118     0     8    1
nchpl      144     3584    0     1885    64     0    64    64     0     8    0
rtmask      32       13    0       13     1     1     0     1     0     8    0
vnodes     216     3128    0        0   174     0   174   174     0     8    0
namei      1024   12195    0    12194     2     1     1     1     0     8    0
percpumem   16       93    0       43     1     0     1     1     0     8    0
vcpupl     3968       2    0        0     1     0     1     1     0     8    0
vmpool     848        2    0        0     1     0     1     1     0     8    0
pfiaddrpl  120        2    0        0     1     0     1     1     0     8    0
kstatmem   264       70    0       44     3     1     2     3     0     8    0
scsiplug    72        3    0        3     1     1     0     1     0     8    0
scxspl     216    20119    0    20119    16     8     8     8     1     8    8
plimitpl   152      114    0       97     1     0     1     1     0     8    0
sigapl     424     1016    0      947     9     1     8     8     0     8    0
knotepl    120      513    0        0    16     0    16    16     0     8    0
kqueuepl   224      256    0      247     5     0     5     5     0     8    4
pipepl     344      159    0      131     3     0     3     3     0     8    0
fdescpl    528      977    0      945     3     0     3     3     0     8    0
filepl     160     5614    0     5393    24     8    16    18     0     8    6
lockfpl    104      378    0      375     2     1     1     2     0     8    0
lockfspl    48      176    0      173     1     0     1     1     0     8    0
sessionpl  144       30    0       21     1     0     1     1     0     8    0
pgrppl      48       45    0       28     1     0     1     1     0     8    0
ucredpl    104      946    0      930     1     0     1     1     0     8    0
zombiepl   144      947    0      947     1     0     1     1     0     8    1
processpl  1232    1016    0      947     6     0     6     6     0     8    0
procpl     664     1916    0     1838     8     0     8     8     0     8    0
sosppl     176        3    0        3     2     1     1     1     0     8    1
sockpl     752     1155    0     1120    30    18    12    17     0     8    8
mcl64k     65536      6    0        0     1     0     1     1     0     8    0
mcl16k     16384      1    0        0     1     0     1     1     0     8    0
mcl12k     12288      2    0        0     1     0     1     1     0     8    0
mcl8k      8192       3    0        0     1     0     1     1     0     8    0
mcl4k      4096     114    0        0    15     0    15    15     0     8    0
mcl2k      2048      23    0        0     3     0     3     3     0     8    0
mtagpl      96        7    0        0     1     0     1     1     0     8    0
mbufpl     256      204    0        0    13     0    13    13     0     8    0
bufpl      280     8702    0     2566   439     0   439   439     0     8    0
anonpl      32    10802    0        0    88     0    88    88     0   246    0
amapchunkpl 152   25967    0    25484    36     8    28    30     0   158    7
amappl16   200     4163    0     4127    35    20    15    23     0     8    7
amappl15   192        8    0        7     1     0     1     1     0     8    0
amappl14   184       10    0       10     1     1     0     1     0     8    0
amappl13   176      440    0      439     1     0     1     1     0     8    0
amappl12   168     1362    0     1320     3     1     2     3     0     8    0
amappl11   160        4    0        3     1     0     1     1     0     8    0
amappl10   152       65    0       51     1     0     1     1     0     8    0
amappl9    144      243    0      243     1     1     0     1     0     8    0
amappl8    136       32    0       29     1     0     1     1     0     8    0
amappl7    128       87    0       86     1     0     1     1     0     8    0
amappl6    120      300    0      287     1     0     1     1     0     8    0
amappl5    112      107    0       97     1     0     1     1     0     8    0
amappl4    104      495    0      465     1     0     1     1     0     8    0
amappl3     96     4408    0     4324     4     1     3     3     0     8    0
amappl2     88     1148    0     1071     2     0     2     2     0     8    0
amappl1     80    13232    0    12632    15     1    14    15     0     8    0
amappl      88     7218    0     7061     5     0     5     5     0    92    0
uvmvnodes   80      116    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     2     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       12    0        0     1     0     1     1     0     8    0
uaddrrnd    24      977    0      945     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      977    0      945     1     0     1     1     0     8    0
vmmpekpl   168    10000    0     9959     3     0     3     3     0     8    0
vmmpepl    168    71718    0    69758   110    12    98   105     0   357    6
vmsppl     488      976    0      945     5     0     5     5     0     8    0
rwobjpl     80    22966    0    21916    30     1    29    30     0     8    0
pdppl      4096    1966    0     1892   104    30    74    84     0     8    0
pvpl        32    19180    0        0   155     0   155   155     0   265    0
pmappl     256      978    0      945     3     0     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      291    0       39     8     0     8     8     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x27:        addq    $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff83863ff0) 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(ffffffff838d1d80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff838d1d80) at __mp_lock+0x192 sys/kern/kern_lock.c:173
intr_handler(ffff80003c3ff7b0,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153
__mp_lock(ffffffff838d1d80) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff838d1d80) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
end of kernel
end trace frame: 0x760ae1ad2e00, count: -11
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
witness_checkorder(fffffd806c925a28,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806c925a10,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffd806c925a10,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8069f7c1d0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd8069f7c1d0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_lookup(ffff80003c504e50) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1
namei(ffff80003c504e50) at namei+0x7ca sys/kern/vfs_lookup.c:250
unp_connect(ffff8000015fcf38,fffffd806f362800,ffff80003abf87e8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872
uipc_dgram_send(ffff8000015fcf38,fffffd806d5e3100,fffffd806f362800,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609
sosend(ffff8000015fcf38,fffffd806f362800,ffff80003c5050d8,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff80003abf87e8,6,ffff80003c505258,e,ffff80003c505310) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785
sys_sendmsg(ffff80003abf87e8,ffff80003c5053c0,ffff80003c505310) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603
syscall(ffff80003c5053c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c5053c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5f7cfe6d0a0, count: -15

Crashes (199181):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/14 09:31 openbsd dca435757bf3 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/14 09:17 openbsd dca435757bf3 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/14 08:16 openbsd dca435757bf3 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/14 07:59 openbsd dca435757bf3 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/14 06:59 openbsd dca435757bf3 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/14 06:51 openbsd dca435757bf3 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/14 05:50 openbsd dca435757bf3 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 22:31 openbsd 002f3ac1824d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 21:28 openbsd 002f3ac1824d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 20:31 openbsd 002f3ac1824d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 19:51 openbsd 002f3ac1824d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 18:55 openbsd 002f3ac1824d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 18:12 openbsd 002f3ac1824d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 17:35 openbsd 002f3ac1824d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 16:37 openbsd 002f3ac1824d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 15:00 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 14:14 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 13:27 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 13:00 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 12:18 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 11:39 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 10:48 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 10:15 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 09:31 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 08:58 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 08:24 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 08:23 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 07:18 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 06:38 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 05:47 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 04:51 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 04:01 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 03:20 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 02:32 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 01:55 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 01:53 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 00:51 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/13 00:19 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/12 23:29 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/12 22:58 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/12 22:16 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2026/02/12 21:41 openbsd 829f23bb157c 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
2025/02/03 09:06 openbsd db5d28f093d6 568559e4 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: lock order data missing
* Struck through repros no longer work on HEAD.