syzbot


uvm_fault: ffs2_balloc (7)

Status: upstream: reported on 2026/03/27 02:05
Reported-by: syzbot+27c62742ccfde7447505@syzkaller.appspotmail.com
First crash: 59d, last: 42m
Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd uvm_fault: ffs2_balloc (2) -1 3 1162d 1231d 0/3 auto-obsoleted due to no activity on 2023/06/18 20:00
openbsd uvm_fault: ffs2_balloc (5) -1 4 407d 555d 0/3 auto-obsoleted due to no activity on 2025/07/12 07:43
openbsd uvm_fault: ffs2_balloc (6) -1 10 167d 254d 0/3 auto-obsoleted due to no activity on 2026/03/09 12:43
openbsd uvm_fault: ffs2_balloc -1 1 1531d 1531d 0/3 auto-closed as invalid on 2022/06/14 20:58
openbsd uvm_fault: ffs2_balloc (3) -1 5 753d 856d 0/3 auto-obsoleted due to no activity on 2024/07/31 16:15
openbsd uvm_fault: ffs2_balloc (4) -1 17 617d 628d 0/3 auto-obsoleted due to no activity on 2024/11/04 07:48

Sample crash report:
uvm_fault(0xffffffff83b11080, 0xffff80001e1020b8, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at      ffs2_balloc+0xa0d:      movq    0(%rcx,%rax,8),%r14
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 163390  43793      0           0          0    0  syz-executor
*172976  93400      0           0  0x4000001    1K syz-executor
ffs2_balloc(fffffd806c38d718,8ff91,48,fffffd80097fd680,1,ffff80003c403088) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614
ffs_write(ffff80003c403110) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd800f79dbe8,ffff80003c4031c0,3,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80003c3cad28,fffffd800f79dbe8,fffffd80097fd680,ffff80003c403290,ffff80003c403270) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692
ktrsysret(ffff80003c3cad28,36,5,ffff80003c403360) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80003c3cad28,36,5,ffff80003c403360) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209
syscall(ffff80003c403410) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80003c403410) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdcfd9956700, count: 8
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(0xffffffff83b11080, 0xffff80001e1020b8, 0, 1) -> d
ddb{1}> trace
ffs2_balloc(fffffd806c38d718,8ff91,48,fffffd80097fd680,1,ffff80003c403088) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614
ffs_write(ffff80003c403110) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd800f79dbe8,ffff80003c4031c0,3,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80003c3cad28,fffffd800f79dbe8,fffffd80097fd680,ffff80003c403290,ffff80003c403270) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692
ktrsysret(ffff80003c3cad28,36,5,ffff80003c403360) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80003c3cad28,36,5,ffff80003c403360) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209
syscall(ffff80003c403410) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80003c403410) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdcfd9956700, count: -7
ddb{1}> show registers
rdi                                0
rsi                                0
rbp               0xffff80003c403030
rbx                                0
rdx               0xffff8000015f9900
rcx               0xffff80001e102000
rax                             0x17
r8                0xffffffffffffffff
r9                0xffff80003c403088
r10                0x5538723d991c8f1
r11                0x72b97b75033dcf6
r12                              0x1
r13               0xffff800000c31800
r14               0xffff80003c402ec0
r15               0xfffffd805f026c10
rip               0xffffffff8139258d    ffs2_balloc+0xa0d
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80003c402eb0
ss                              0x10
ffs2_balloc+0xa0d:      movq    0(%rcx,%rax,8),%r14
ddb{1}> show proc
PROC (syz-executor) tid=172976 pid=93400 tcnt=2 stat=onproc
    flags process=0 proc=4000001<INKTR,THREAD>
    runpri=32, usrpri=86, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80003c3cbcb8,0xffff80002a235250
    process=0xffff8000fffe26a8 user=0xffff80003c3fe000, vmspace=0xfffffd806c68a7b8
    estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 43793  163390  88827      0  7           0                syz-executor
 43793   17225  88827      0  3   0x4000080  fsleep        syz-executor
 60380  337662  21914      0  2    0x100000                sh
 31412   81256  22809      0  2           0                syz-executor
 31412  233071  22809      0  3   0x4000080  fsleep        syz-executor
 21914   88159  42109      0  3    0x10008a  sigsusp       sh
  2190  425045  87491      0  2           0                syz-executor
  2190   73236  87491      0  3   0x4000080  fsleep        syz-executor
 93400  156373  39241      0  2           0                syz-executor
*93400  172976  39241      0  7   0x4000001                syz-executor
 16953  415740  24654      0  3        0x80  nanoslp       syz-executor
 16953  513455  24654      0  3   0x4000080  sbwait        syz-executor
 16953  147026  24654      0  3   0x4000080  fsleep        syz-executor
 42109  370886   2037      0  3        0x82  wait          syz-executor
 76376   36762      0      0  3     0x14280  nfsidl        nfsio
 23729  277293      0      0  3     0x14280  nfsidl        nfsio
 60128  402505      0      0  3     0x14280  nfsidl        nfsio
 98571  473772      0      0  3     0x14280  nfsidl        nfsio
 78747  371600      0      0  3     0x14280  nfsidl        nfsio
 31644  395096      0      0  3     0x14280  nfsidl        nfsio
 43060  406797      0      0  3     0x14280  nfsidl        nfsio
 99997     369      0      0  3     0x14280  nfsidl        nfsio
 88335  179459      0      0  3     0x14280  nfsidl        nfsio
  4332  306848      0      0  3     0x14280  nfsidl        nfsio
 28700   64352      0      0  3     0x14280  nfsidl        nfsio
 55553  403047      0      0  3     0x14280  nfsidl        nfsio
 12750  332881      0      0  3     0x14280  nfsidl        nfsio
 66536  492575      0      0  3     0x14280  nfsidl        nfsio
 51491  498920      0      0  3     0x14280  nfsidl        nfsio
 52356  109350      0      0  3     0x14280  nfsidl        nfsio
 12227  110899      0      0  3     0x14280  nfsidl        nfsio
 56573  219383      0      0  3     0x14280  nfsidl        nfsio
 16522  387881      0      0  3     0x14280  nfsidl        nfsio
 99906  388480      0      0  3     0x14280  nfsidl        nfsio
 39241   54741   2037      0  3        0x82  nanoslp       syz-executor
 22809  444070   2037      0  3        0x82  nanoslp       syz-executor
 44948  516881   2037      0  3        0x82  wait          syz-executor
 87491  104430   2037      0  3        0x82  nanoslp       syz-executor
 24654  271162   2037      0  3        0x82  nanoslp       syz-executor
 88827  262670   2037      0  3        0x82  nanoslp       syz-executor
 28008   39705   2037      0  2         0x2                syz-executor
  2037  230114      1      0  3        0x82  kqread        syz-executor
 26131  271888      1      0  3        0x8a  kqread        sshd
 74297  368714  21608     74  3   0x1100092  bpf           pflogd
 21608  208012      1      0  3        0x80  sbwait        pflogd
 67942  520874  24777     73  3   0x1100090  kqread        syslogd
 24777  181915      1      0  3    0x100082  sbwait        syslogd
 56303   88681      1      0  3    0x100080  kqread        resolvd
 72375  364426  26142     77  3    0x100092  kqread        dhcpleased
 45760  157603  26142     77  3    0x100092  kqread        dhcpleased
 26142  391199      1      0  3        0x80  kqread        dhcpleased
 99887  355510      0      0  3     0x14200  bored         smr
 29210  519013      0      0  2     0x14200                zerothread
 18896  257886      0      0  3     0x14200  aiodoned      aiodoned
 81014  391227      0      0  3     0x14200  syncer        update
 34044   58800      0      0  3     0x14200  cleaner       cleaner
 36063  457178      0      0  3     0x14200  reaper        reaper
 56844  182469      0      0  3     0x14200  pgdaemon      pagedaemon
 67329    7798      0      0  3     0x14200  bored         viomb
 91578   46933      0      0  3  0x40014200  acpi0         acpi0
 52093  414649      0      0  3  0x40014200                idle1
 60923  207659      0      0  3     0x14200  bored         softnet1
 57930  189550      0      0  3     0x14200  bored         softnet0
 16322   49050      0      0  3     0x14200  bored         systqmp
 76110  103239      0      0  3     0x14200  bored         systq
 39629  324969      0      0  3     0x14200  tmoslp        softclockmp
 67719   21532      0      0  3  0x40014200  tmoslp        softclock
 98476  506523      0      0  3  0x40014200                idle0
     1  381005      0      0  4  0x58000082                init
     0       0     -1      0  3  0x10010200  scheduler     swapper
ddb{1}> show all locks
Process 43793 (syz-executor) thread 0xffff80003c3ca2c8 (163390)
Process 93400 (syz-executor) thread 0xffff80003c3cad28 (172976)
Process 28008 (syz-executor) thread 0xffff80002a2222a8 (39705)
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 11069  12161K   12380K 166960K     12366        0
            pcb    19     12K      12K 166960K        54        0
         rtable   236      8K       9K 166960K       397        0
             pf    34     17K      81K 166960K        65        0
         ifaddr    41      7K       7K 166960K        54        0
        ifgroup    55      2K       2K 166960K        77        0
         sysctl     3      1K       9K 166960K         9        0
       counters    70     37K      37K 166960K        88        0
       ioctlops     0      0K       4K 166960K      1524        0
            iov     0      0K      16K 166960K        47        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1326     83K      84K 166960K      1558        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       5K 166960K         7        0
         VM map     2      1K       1K 166960K         2        0
            sem    11      0K       0K 166960K        15        0
        dirhash    12      2K       2K 166960K        12        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    18     65K      93K 166960K       352        0
          sigio     0      0K       0K 166960K         3        0
           proc    63     99K     164K 166960K       598        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     0      0K       0K 166960K        87        0
       in_multi    89      6K       7K 166960K       104        0
    ether_multi     1      0K       0K 166960K         1        0
            mrt     0      0K       0K 166960K        11        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       479        0
   fusefs mount     1     32K      32K 166960K         1        0
     pfkey data     0      0K       0K 166960K         1        0
            tdb     3      0K       0K 166960K         3        0
        VM swap     8     62K      64K 166960K        10        0
       UVM amap   208    139K     176K 166960K      5000        0
       UVM aobj    12      2K       2K 166960K        13        0
     pinsyscall    36     72K     106K 166960K      1540        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     0      0K       0K 166960K        16        0
            NDP    12      0K       2K 166960K        34        0
           temp    42   9111K    9179K 166960K     21499        0
         kqueue    11     16K      30K 166960K        68        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       47    0       44     1     0     1     1     0     8    0
rtentry    176      119    0       15     6     0     6     6     0     8    0
unpcb      144      151    0      135     2     1     1     2     0     8    0
syncache   336        6    0        6     1     1     0     1     0     8    0
tcpcb      736       64    0       61     1     0     1     1     0     8    0
arp        136       21    0        2     1     0     1     1     0     8    0
inpcb      328      269    0      260     4     2     2     4     0     8    1
nd6        152       25    0        4     1     0     1     1     0     8    0
pkpcb       40        1    0        1     1     1     0     1     0     8    0
kcovpl      48        9    0        1     1     0     1     1     0     8    0
ppxss      1192       5    0        5     1     1     0     1     0     8    0
pffrag     232        1    0        0     1     0     1     1     0   482    0
pffrnode    88        1    0        0     1     0     1     1     0     8    0
pffrent     40        1    0        0     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
pfstitem    24       37    0        0     1     0     1     1     0     8    0
pfstkey    128       37    0        0     2     0     2     2     0     8    0
pfstate    448       37    0        0     5     0     5     5     0     8    0
pfrule     1360      24    0       19     2     1     1     2     0     8    0
rttmr      136        1    0        1     1     1     0     1     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      459    0       46    29     0    29    29     0     8    0
art_table   40      460    0       46     5     0     5     5     0     8    0
art_node    32      118    0       24     1     0     1     1     0     8    0
sysvmsgpl   40       26    0        2     1     0     1     1     0     8    0
semupl     112        1    0        1     1     1     0     1     0     8    0
semapl      72       12    0        3     1     0     1     1     0     8    0
shmpl      112       10    0        1     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1957    0      490    93     0    93    93     0     8    0
ffsino     296     1957    0      490   114     0   114   114     0     8    0
nchpl      144     2436    0      732    64     0    64    64     0     8    0
rtmask      32        2    0        2     1     1     0     1     0     8    0
vnodes     216     2170    0        0   121     0   121   121     0     8    0
namei      1024    8003    0     8002     2     1     1     1     0     8    0
percpumem   16       59    0        9     1     0     1     1     0     8    0
kstatmem   264       39    0       12     2     0     2     2     0     8    0
scxspl     216    18484    0    18484     4     3     1     3     1     8    1
plimitpl   152       50    0       34     1     0     1     1     0     8    0
sigapl     424      689    0      623     8     0     8     8     0     8    0
knotepl    120      743    0        0    23     0    23    23     0     8    0
kqueuepl   224       74    0       66     1     0     1     1     0     8    0
pipepl     344      146    0      119     3     0     3     3     0     8    0
fdescpl    528      653    0      625     3     0     3     3     0     8    0
filepl     160     2973    0     2760    14     2    12    13     0     8    0
lockfpl    104      133    0      131     2     1     1     2     0     8    0
lockfspl    48       33    0       31     1     0     1     1     0     8    0
sessionpl  144       34    0       26     1     0     1     1     0     8    0
pgrppl      48       45    0       29     1     0     1     1     0     8    0
ucredpl    104      330    0      317     1     0     1     1     0     8    0
zombiepl   144      626    0      623     1     0     1     1     0     8    0
processpl  1232     689    0      623     6     0     6     6     0     8    0
procpl     664     1076    0     1004     8     0     8     8     0     8    0
sockpl     752      476    0      448     8     3     5     8     0     8    1
mcl64k     65536      2    0        0     1     0     1     1     0     8    0
mcl8k      8192       2    0        0     1     0     1     1     0     8    0
mcl4k      4096     129    0        0    17     0    17    17     0     8    0
mcl2k      2048      19    0        0     3     0     3     3     0     8    0
mtagpl      96        3    0        0     1     0     1     1     0     8    0
mbufpl     256      190    0        0    12     0    12    12     0     8    0
bufpl      280     8018    0     1757   448     0   448   448     0     8    0
anonpl      32     8272    0        0    67     0    67    67     0   246    0
amapchunkpl 152   14654    0    14223    29     6    23    29     0   158    2
amappl16   200     2087    0     2064    19     4    15    17     0     8    8
amappl15   192       11    0       11     2     2     0     1     0     8    0
amappl14   184      458    0      457     1     0     1     1     0     8    0
amappl13   176      128    0      119     1     0     1     1     0     8    0
amappl12   168      905    0      879     2     0     2     2     0     8    0
amappl11   160       37    0       37     2     1     1     1     0     8    1
amappl10   152       65    0       51     1     0     1     1     0     8    0
amappl9    144      271    0      271     1     1     0     1     0     8    0
amappl8    136      101    0       98     1     0     1     1     0     8    0
amappl7    128      149    0      138     1     0     1     1     0     8    0
amappl6    120      166    0      164     1     0     1     1     0     8    0
amappl5    112       98    0       89     1     0     1     1     0     8    0
amappl4    104      312    0      292     1     0     1     1     0     8    0
amappl3     96     2928    0     2827     4     0     4     4     0     8    0
amappl2     88      585    0      535     2     0     2     2     0     8    0
amappl1     80    12124    0    11712    16     1    15    16     0     8    2
amappl      88     4216    0     4070     5     0     5     5     0    92    0
uvmvnodes   80      103    0        0     3     0     3     3     0     8    0
dma4096    4096       1    0        1     1     1     0     1     0     8    0
dma1024    1024       2    0        1     1     0     1     1     0     8    0
dma256     256        6    0        6     1     1     0     1     0     8    0
dma128     128      253    0      253     1     1     0     1     0     8    0
dma64       64        6    0        6     1     1     0     1     0     8    0
dma32       32        7    0        7     1     1     0     1     0     8    0
dma16       16       18    0       17     1     0     1     1     0     8    0
aobjpl      72       12    0        1     1     0     1     1     0     8    0
uaddrrnd    24      653    0      625     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      653    0      625     1     0     1     1     0     8    0
vmmpekpl   168     7673    0     7630     3     0     3     3     0     8    0
vmmpepl    168    51237    0    49706   104     0   104   104     0   357   18
vmsppl     488      652    0      625     5     0     5     5     0     8    0
rwobjpl     80    17910    0    17038    30     1    29    30     0     8    0
pdppl      4096    1313    0     1250   103    30    73    85     0     8   10
pvpl        32    15835    0        0   129     1   128   128     0   265    0
pmappl     256      652    0      625     3     0     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      280    0       35     8     0     8     8     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x27:        addq    $0x8,%rsp
x86_ipi_db(ffffffff83951ff0) 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(ffffffff83a6a5c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a6a5c0) at __mp_lock+0x192 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
__mp_lock(ffffffff83a6a5c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a6a5c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
uvm_fault(fffffd806e84b998,4ec87aa8000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650
upageflttrap(ffff80002a24a840,4ec87aa8000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80002a24a840) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7ce19123e2d0, count: 3
ddb{0}> trace
x86_ipi_db(ffffffff83951ff0) 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(ffffffff83a6a5c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a6a5c0) at __mp_lock+0x192 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
__mp_lock(ffffffff83a6a5c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a6a5c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
uvm_fault(fffffd806e84b998,4ec87aa8000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650
upageflttrap(ffff80002a24a840,4ec87aa8000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80002a24a840) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7ce19123e2d0, count: -12
ddb{0}> machine ddbcpu 1
Stopped at      ffs2_balloc+0xa0d:      movq    0(%rcx,%rax,8),%r14
ffs2_balloc(fffffd806c38d718,8ff91,48,fffffd80097fd680,1,ffff80003c403088) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614
ffs_write(ffff80003c403110) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd800f79dbe8,ffff80003c4031c0,3,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80003c3cad28,fffffd800f79dbe8,fffffd80097fd680,ffff80003c403290,ffff80003c403270) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692
ktrsysret(ffff80003c3cad28,36,5,ffff80003c403360) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80003c3cad28,36,5,ffff80003c403360) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209
syscall(ffff80003c403410) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80003c403410) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdcfd9956700, count: 8
ddb{1}> trace
ffs2_balloc(fffffd806c38d718,8ff91,48,fffffd80097fd680,1,ffff80003c403088) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614
ffs_write(ffff80003c403110) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd800f79dbe8,ffff80003c4031c0,3,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80003c3cad28,fffffd800f79dbe8,fffffd80097fd680,ffff80003c403290,ffff80003c403270) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692
ktrsysret(ffff80003c3cad28,36,5,ffff80003c403360) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80003c3cad28,36,5,ffff80003c403360) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209
syscall(ffff80003c403410) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80003c403410) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdcfd9956700, count: -7
ddb{1}> 

Crashes (314):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/25 20:58 openbsd 61b7e18e5713 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/25 13:05 openbsd 3ca1fbf96c86 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/25 09:52 openbsd 3ca1fbf96c86 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/25 07:44 openbsd 3ca1fbf96c86 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/25 04:15 openbsd 3ca1fbf96c86 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/25 00:05 openbsd 6adc68a286a5 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/23 17:48 openbsd 19a8be4fa5c4 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/23 07:38 openbsd dbd5cf8c5e8a c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/22 20:33 openbsd 54bbd1fe416a 95d90255 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/22 16:23 openbsd 54bbd1fe416a 95d90255 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/22 14:46 openbsd 54bbd1fe416a 95d90255 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/22 06:03 openbsd ca78e759411d 70ae9b03 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/22 04:56 openbsd ca78e759411d 70ae9b03 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/21 23:55 openbsd ca78e759411d 70ae9b03 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/21 14:50 openbsd 19a7e1efad25 747d777d .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/21 05:41 openbsd be9eb1babb0f 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/21 01:42 openbsd be9eb1babb0f 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/20 19:26 openbsd d39f547900e2 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/20 12:02 openbsd d39f547900e2 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/19 18:54 openbsd 3fe334830a75 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/19 16:24 openbsd 8a5afb5cdcf9 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/19 14:39 openbsd 8a5afb5cdcf9 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/19 11:55 openbsd 8a5afb5cdcf9 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/18 14:39 openbsd 453e3248fd2d 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/18 11:19 openbsd 453e3248fd2d 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/18 03:08 openbsd 453e3248fd2d 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/17 19:54 openbsd c52d99c0253a 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/17 17:39 openbsd c52d99c0253a 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/17 07:53 openbsd c057dfdb27e5 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/16 12:58 openbsd 501fc77f080e 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/15 23:41 openbsd 25d4b1a85733 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/15 16:18 openbsd 8e47d2e8b1e5 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: ffs2_balloc
2026/05/15 15:07 openbsd 8e47d2e8b1e5 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/15 12:58 openbsd 8e47d2e8b1e5 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/15 04:12 openbsd 9f6962b18ef0 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/14 08:52 openbsd 86898828a45d 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 23:37 openbsd ed5454cb43ec 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 22:27 openbsd ed5454cb43ec 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 18:20 openbsd ed5454cb43ec 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 14:18 openbsd 104c674285fe 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 12:55 openbsd 104c674285fe 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 09:58 openbsd 104c674285fe 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 08:56 openbsd 104c674285fe 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 07:37 openbsd 104c674285fe 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 06:14 openbsd 104c674285fe 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/05/13 05:13 openbsd 104c674285fe 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
2026/03/27 02:05 openbsd 2f434a4256f3 4b3d9a38 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: ffs2_balloc
* Struck through repros no longer work on HEAD.