syzbot


panic: ffs2_balloc: unwind failed (4)

Status: upstream: reported on 2026/04/03 13:33
Reported-by: syzbot+6a85d4fe8fa209ea90f7@syzkaller.appspotmail.com
First crash: 62d, last: 10d
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd panic: ffs2_balloc: unwind failed (2) 2 1 458d 458d 0/3 auto-obsoleted due to no activity on 2025/06/01 04:48
openbsd panic: ffs2_balloc: unwind failed (3) 2 1 244d 244d 0/3 auto-obsoleted due to no activity on 2026/01/01 15:18
openbsd panic: ffs2_balloc: unwind failed 2 1 628d 628d 0/3 auto-obsoleted due to no activity on 2024/12/13 17:12

Sample crash report:
panic: ffs2_balloc: unwind failed
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*230582  62929      0           0  0x4000000    0K syz-executor
  82615  68176      0         0x2          0    1  syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8344130c) at panic+0x1e5 sys/kern/subr_prf.c:198
ffs2_balloc(fffffd806c051150,40000000006,1,fffffd80097fd410,1,ffff80003c3f46e0) at ffs2_balloc+0x1961
ffs_truncate(fffffd806c051150,40000000007,0,fffffd80097fd410) at ffs_truncate+0x410 sys/ufs/ffs/ffs_inode.c:185
ufs_setattr(ffff80003c3f4800) at ufs_setattr+0x8e9 sys/ufs/ufs/ufs_vnops.c:403
VOP_SETATTR(fffffd806c664a60,ffff80003c3f4888,fffffd80097fd410,ffff80002a220018) at VOP_SETATTR+0x11b sys/kern/vfs_vops.c:210
dotruncate(ffff80002a220018,fffffd806c664a60,40000000007) at dotruncate+0x1da sys/kern/vfs_syscalls.c:2898
sys_ftruncate(ffff80002a220018,ffff80003c3f4ab0,ffff80003c3f4a00) at sys_ftruncate+0x20a sys/kern/vfs_syscalls.c:2952
syscall(ffff80003c3f4ab0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3f4ab0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb4d8f67f130, count: 5
https://www.openbsd.org/ddb.html describes the minimum info required in bug
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ddb{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: ffs2_balloc: unwind failed
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8344130c) at panic+0x1e5 sys/kern/subr_prf.c:198
ffs2_balloc(fffffd806c051150,40000000006,1,fffffd80097fd410,1,ffff80003c3f46e0) at ffs2_balloc+0x1961
ffs_truncate(fffffd806c051150,40000000007,0,fffffd80097fd410) at ffs_truncate+0x410 sys/ufs/ffs/ffs_inode.c:185
ufs_setattr(ffff80003c3f4800) at ufs_setattr+0x8e9 sys/ufs/ufs/ufs_vnops.c:403
VOP_SETATTR(fffffd806c664a60,ffff80003c3f4888,fffffd80097fd410,ffff80002a220018) at VOP_SETATTR+0x11b sys/kern/vfs_vops.c:210
dotruncate(ffff80002a220018,fffffd806c664a60,40000000007) at dotruncate+0x1da sys/kern/vfs_syscalls.c:2898
sys_ftruncate(ffff80002a220018,ffff80003c3f4ab0,ffff80003c3f4a00) at sys_ftruncate+0x20a sys/kern/vfs_syscalls.c:2952
syscall(ffff80003c3f4ab0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3f4ab0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb4d8f67f130, count: -10
ddb{0}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff80003c3f4340
rbx               0xffffffff8399ee07    cpu_info_full_primary+0x2e07
rdx                                0
rcx               0xffff80002a220018
rax               0xffffffff8399dff0    cpu_info_full_primary+0x1ff0
r8                 0x101010101010101
r9                0x8080808080808080
r10               0xd8f43f233a7dd7cc
r11               0x91d22799c5799828
r12               0xffffffff8399ec08    cpu_info_full_primary+0x2c08
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff82536425    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80003c3f4330
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=230582 pid=62929 tcnt=4 stat=onproc
    flags process=0 proc=4000000<THREAD>
    runpri=17, usrpri=86, slppri=17, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80002a221770,0xffffffff83a421e0
    process=0xffff8000fffe4020 user=0xffff80003c3ef000, vmspace=0xfffffd806c6b67b8
    estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0
ddb{0}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 62929   41988   7378      0  2       0xc80                syz-executor
 62929  311050   7378      0  3   0x4000080  fsleep        syz-executor
 62929   41051   7378      0  2   0x4000000                syz-executor
*62929  230582   7378      0  7   0x4000000                syz-executor
 22643  429769  61036      0  3      0x3000  suspend       syz-executor
 22643  437110  61036      0  2   0x4081000                syz-executor
  7435  111671  68176      0  2           0                syz-executor
  7435   37949  68176      0  3   0x4000080  msgwait       syz-executor
  8767  457184  54771      0  2           0                syz-executor
  8767  398543  54771      0  2   0x4000000                syz-executor
 29794  491562  88560      0  2           0                syz-executor
 29794  289609  88560      0  3   0x4000080  fsleep        syz-executor
   665  348628  98103  60929  2        0x10                syz-executor
   665  100011  98103  60929  3   0x4000090  fsleep        syz-executor
 46597  238122  58112      0  2           0                syz-executor
 46597  392021  58112      0  3   0x4000080  fsleep        syz-executor
 46597   97794  58112      0  3   0x4000080  fsleep        syz-executor
 39914  248018  99381     -1  2       0xc90                syz-executor
 39914  272754  99381     -1  3   0x4000098  kqread        syz-executor
 39914  476693  99381     -1  3   0x4000090  fsleep        syz-executor
 88560  260249  84249      0  2       0xc82                syz-executor
 99381  325424  84249      0  2       0xc82                syz-executor
  7378  269057  84249      0  2       0xc82                syz-executor
 54771  369363  84249      0  2       0xc82                syz-executor
 61036   88940  84249      0  2       0xc82                syz-executor
 68176   82615  84249      0  7         0x2                syz-executor
 98103   34845  84249      0  2       0xc82                syz-executor
 58112    8539  84249      0  2       0xc82                syz-executor
 84249  146520  22712      0  2         0x2                syz-executor
 22712  204336  78901      0  3    0x10008a  sigsusp       ksh
 78901  109694  33075      0  3        0x98  kqread        sshd-session
 33075  358834  71042      0  3        0x92  kqread        sshd-session
 91627  440634      1      0  3    0x100083  ttyin         getty
 71042  374525      1      0  3        0x88  kqread        sshd
 10171  107093  70318     74  2   0x1100012                pflogd
 70318   56318      1      0  3        0x80  sbwait        pflogd
 46418   22175   1542     73  3   0x1100090  kqread        syslogd
  1542  341936      1      0  3    0x100082  sbwait        syslogd
 63973  300349      1      0  3    0x100080  kqread        resolvd
 44967  227545   8405     77  3    0x100092  kqread        dhcpleased
 23923  305099   8405     77  3    0x100092  kqread        dhcpleased
  8405  278673      1      0  3        0x80  kqread        dhcpleased
 73835  469567      0      0  3     0x14200  bored         smr
 69467  216259      0      0  2     0x14200                zerothread
 50338   82660      0      0  3     0x14200  aiodoned      aiodoned
 95627  305118      0      0  3     0x14200  syncer        update
 50667  517046      0      0  3     0x14200  cleaner       cleaner
 25444  384551      0      0  3     0x14200  reaper        reaper
 20321  292996      0      0  3     0x14200  pgdaemon      pagedaemon
 13295  515467      0      0  3     0x14200  bored         viomb
 13445  246506      0      0  3  0x40014200  acpi0         acpi0
 61701  352863      0      0  3  0x40014200                idle1
 32084  346974      0      0  3     0x14200  bored         softnet1
 47344  497466      0      0  3     0x14200  bored         softnet0
 76522  228827      0      0  3     0x14200  smrbar        systqmp
 87661  472796      0      0  3     0x14200  bored         systq
 92323  514080      0      0  3     0x14200  tmoslp        softclockmp
  8242  470801      0      0  3  0x40014200  tmoslp        softclock
 65930  258154      0      0  3  0x40014200                idle0
     1  491302      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{0}> show all locks
Process 62929 (syz-executor) thread 0xffff80002a220018 (230582)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839ffcc0)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
#2  sleep_finish+0x2d8 sys/kern/kern_synch.c:369
#3  biowait+0xc6 sys/kern/vfs_bio.c:1242
#4  bwrite+0x2e7 sys/kern/vfs_bio.c:754
#5  ffs2_balloc+0xc24 sys/ufs/ffs/ffs_balloc.c:646
#6  ffs_truncate+0x410 sys/ufs/ffs/ffs_inode.c:185
#7  ufs_setattr+0x8e9 sys/ufs/ufs/ufs_vnops.c:403
#8  VOP_SETATTR+0x11b sys/kern/vfs_vops.c:210
#9  dotruncate+0x1da sys/kern/vfs_syscalls.c:2898
#10 sys_ftruncate+0x20a sys/kern/vfs_syscalls.c:2952
#11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#12 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806c0511f0)
#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_ftruncate+0x1f1 sys/kern/vfs_syscalls.c:2952
#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
Process 76522 (systqmp) thread 0xffff8000ffffe530 (228827)
shared rwlock systqmp r = 0 (0xffffffff8397cc78)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  taskq_thread+0x12a sys/kern/kern_task.c:442
#2  proc_trampoline+0x10
ddb{0}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 11056  12085K   12223K 166960K     12274        0
            pcb    17     13K      14K 166960K        65        0
         rtable   237      6K       7K 166960K       351        0
             pf    34     17K      19K 166960K        49        0
         ifaddr    43      7K       7K 166960K        46        0
        ifgroup    55      2K       2K 166960K        60        0
         sysctl     1      1K       9K 166960K         5        0
       counters    70     37K      37K 166960K        72        0
       ioctlops     0      0K       4K 166960K      1488        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1401     88K      88K 166960K      1476        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       1K 166960K         2        0
         VM map     2      1K       1K 166960K         2        0
            sem     3      0K       0K 166960K         3        0
        dirhash    12      2K       2K 166960K        12        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    18     65K      97K 166960K       148        0
           proc    72    115K     147K 166960K       554        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     2      0K       0K 166960K         2        0
       in_multi    99      7K       7K 166960K        99        0
    ether_multi     1      0K       0K 166960K         2        0
            mrt     0      0K       0K 166960K         2        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys    37    175K     175K 166960K        37        0
           exec     0      0K       1K 166960K       383        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   244    159K     169K 166960K      3135        0
       UVM aobj     3      2K       2K 166960K         3        0
     pinsyscall    43     86K     108K 166960K      1304        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
            NDP    28      2K       2K 166960K        29        0
           temp    35   9110K    9174K 166960K      4318        0
         kqueue    14     22K      26K 166960K        28        0
      SYN cache     2     16K      16K 166960K         2        0
ddb{0}> 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       33    0       30     1     0     1     1     0     8    0
rtentry    176      111    0        1     5     0     5     5     0     8    0
unpcb      144       45    0       28     1     0     1     1     0     8    0
syncache   336        4    0        4     1     0     1     1     0     8    1
tcpcb      736       13    0        5     1     0     1     1     0     8    0
arp        136       18    0        0     1     0     1     1     0     8    0
inpcb      328      110    0       97     4     0     4     4     0     8    2
nd6        152       24    0        0     1     0     1     1     0     8    0
kcovpl      48        8    0        0     1     0     1     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       18    0        0     1     0     1     1     0     8    0
pfstkey    128       18    0        0     1     0     1     1     0     8    0
pfstate    448       18    0        0     2     0     2     2     0     8    0
pfrule     1360      22    0       16     2     1     1     2     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      453    0        0    29     0    29    29     0     8    0
art_table   40      454    0        0     5     0     5     5     0     8    0
art_node    32      111    0       10     1     0     1     1     0     8    0
semapl      72        1    0        0     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1589    0      116    93     0    93    93     0     8    0
ffsino     296     1589    0      116   114     0   114   114     0     8    0
nchpl      144     1804    0       89    64     0    64    64     0     8    0
vnodes     216     1790    0        0   100     0   100   100     0     8    0
namei      1024    5838    0     5838     1     0     1     1     0     8    1
percpumem   16       51    0        1     1     0     1     1     0     8    0
kstatmem   264       29    0        2     2     0     2     2     0     8    0
scxspl     216     6332    0     6332     4     1     3     3     1     8    3
plimitpl   152       31    0       13     1     0     1     1     0     8    0
sigapl     424      465    0      417     7     0     7     7     0     8    1
knotepl    120       66    0        0     2     0     2     2     0     8    0
kqueuepl   224       25    0       15     1     0     1     1     0     8    0
pipepl     344      126    0       99     3     0     3     3     0     8    0
fdescpl    528      449    0      417     3     0     3     3     0     8    0
filepl     160     1894    0     1673    20     0    20    20     0     8   10
lockfpl    104       13    0        9     1     0     1     1     0     8    0
lockfspl    48        8    0        4     1     0     1     1     0     8    0
sessionpl  144       24    0       15     1     0     1     1     0     8    0
pgrppl      48       33    0       16     1     0     1     1     0     8    0
ucredpl    104       91    0       76     1     0     1     1     0     8    0
zombiepl   144      418    0      417     1     0     1     1     0     8    0
processpl  1232     465    0      417     5     0     5     5     0     8    0
procpl     664      502    0      442     6     0     6     6     0     8    0
sosppl     176        2    0        2     1     0     1     1     0     8    1
sockpl     752      191    0      158     7     0     7     7     0     8    3
mcl64k     65536      1    0        0     1     0     1     1     0     8    0
mcl8k      8192       2    0        0     1     0     1     1     0     8    0
mcl4k      4096     128    0        0    16     0    16    16     0     8    0
mcl2k      2048      14    0        0     2     0     2     2     0     8    0
mtagpl      96        2    0        0     1     0     1     1     0     8    0
mbufpl     256      133    0        0     9     0     9     9     0     8    0
bufpl      280     2443    0      105   167     0   167   167     0     8    0
anonpl      32     3871    0        0    32     0    32    32     0   246    0
amapchunkpl 152    8582    0     8059    21     0    21    21     0   158    0
amappl16   200     2030    0     1996     5     0     5     5     0     8    3
amappl15   192       75    0       75     1     0     1     1     0     8    1
amappl14   184      431    0      430     1     0     1     1     0     8    0
amappl13   176      126    0      114     1     0     1     1     0     8    0
amappl12   168      697    0      666     2     0     2     2     0     8    0
amappl11   160       42    0       42     1     0     1     1     0     8    1
amappl10   152       75    0       61     1     0     1     1     0     8    0
amappl9    144      276    0      276     1     0     1     1     0     8    1
amappl8    136      102    0      100     1     0     1     1     0     8    0
amappl7    128      146    0      132     1     0     1     1     0     8    0
amappl6    120      152    0      151     1     0     1     1     0     8    0
amappl5    112      100    0       90     1     0     1     1     0     8    0
amappl4    104      294    0      273     1     0     1     1     0     8    0
amappl3     96     1551    0     1429     3     0     3     3     0     8    0
amappl2     88      536    0      477     2     0     2     2     0     8    0
amappl1     80    10493    0     9889    15     0    15    15     0     8    0
amappl      88     2408    0     2235     4     0     4     4     0    92    0
uvmvnodes   80      100    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      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        2    0        0     1     0     1     1     0     8    0
uaddrrnd    24      449    0      417     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      449    0      417     1     0     1     1     0     8    0
vmmpekpl   168     5745    0     5713     2     0     2     2     0     8    0
vmmpepl    168    38641    0    36675    89     0    89    89     0   357    1
vmsppl     488      448    0      417     5     0     5     5     0     8    0
rwobjpl     80    14872    0    13829    24     0    24    24     0     8    0
pdppl      4096     905    0      834    99    12    87    87     0     8   16
pvpl        32    10055    0        0    82     0    82    82     0   265    0
pmappl     256      448    0      417     3     0     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      267    0       15     8     0     8     8     0     8    0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8344130c) at panic+0x1e5 sys/kern/subr_prf.c:198
ffs2_balloc(fffffd806c051150,40000000006,1,fffffd80097fd410,1,ffff80003c3f46e0) at ffs2_balloc+0x1961
ffs_truncate(fffffd806c051150,40000000007,0,fffffd80097fd410) at ffs_truncate+0x410 sys/ufs/ffs/ffs_inode.c:185
ufs_setattr(ffff80003c3f4800) at ufs_setattr+0x8e9 sys/ufs/ufs/ufs_vnops.c:403
VOP_SETATTR(fffffd806c664a60,ffff80003c3f4888,fffffd80097fd410,ffff80002a220018) at VOP_SETATTR+0x11b sys/kern/vfs_vops.c:210
dotruncate(ffff80002a220018,fffffd806c664a60,40000000007) at dotruncate+0x1da sys/kern/vfs_syscalls.c:2898
sys_ftruncate(ffff80002a220018,ffff80003c3f4ab0,ffff80003c3f4a00) at sys_ftruncate+0x20a sys/kern/vfs_syscalls.c:2952
syscall(ffff80003c3f4ab0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3f4ab0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb4d8f67f130, count: -10
ddb{0}> machine ddbcpu 1
Stopped at      x86_ipi_db+0x27:        addq    $0x8,%rsp
x86_ipi_db(ffff80002999dff0) 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(ffffffff839ff4c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff839ff4c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80002a2e6720) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a2e6720) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x74f2ac37e7a0, count: 9
ddb{1}> trace
x86_ipi_db(ffff80002999dff0) 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(ffffffff839ff4c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff839ff4c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80002a2e6720) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a2e6720) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x74f2ac37e7a0, count: -6

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/24 23:25 openbsd 6adc68a286a5 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/05/24 12:15 openbsd 19a448b47c50 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/05/09 17:01 openbsd 387d82fb614c 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/05/08 01:30 openbsd d8525c0ee876 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/05/06 11:44 openbsd eec9cf095b26 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/04/26 18:07 openbsd 443952c09f98 9c2d0995 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/04/21 04:44 openbsd 5ca82bba1a6e 1a086e7c .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/04/19 22:50 openbsd 2fc67ad6b988 1a086e7c .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/04/14 18:37 openbsd 84c70f1e56c7 1a086e7c .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/04/12 10:37 openbsd 6018ae1d0153 4b3d9a38 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/04/10 19:50 openbsd 411a0c209e89 4b3d9a38 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/04/03 13:32 openbsd de6be2070bf6 4b3d9a38 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
* Struck through repros no longer work on HEAD.