syzbot


uvm_fault: _rb_remove

Status: upstream: reported on 2026/03/12 13:20
Reported-by: syzbot+230923220bfd54de985e@syzkaller.appspotmail.com
First crash: 7d16h, last: 7d16h

Sample crash report:
uvm_fault(0xfffffd806ccf4a20, 0x7d488207c18, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at      _rb_remove+0x5a8:       movl    0x18(%r15),%r14d
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*325158  12468      0           0  0x4000000    0  syz-executor
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 rbe_remove_color sys/kern/subr_tree.c:271 [inline]
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 rbe_remove sys/kern/subr_tree.c:384 [inline]
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 sys/kern/subr_tree.c:395
brelse(fffffd800e003030) at brelse+0x2f9 sys/kern/vfs_bio.c:891
vinvalbuf(fffffd8064a5e5e8,2,fffffd8007ffd410,ffff8000338d7250,0,ffffffffffffffff) at vinvalbuf+0x539 sys/kern/vfs_subr.c:1997
ffs_truncate(fffffd806c929900,0,4,fffffd8007ffd410) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1
ffs_write(ffff80003c9d3b80) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffffd8064a5e5e8,ffff80003c9d3d38,7,fffffd8007ffd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806cc2f088,ffff80003c9d3d38,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff8000338d7250,3,ffff80003c9d3d38,0,ffff80003c9d3de0) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_write(ffff8000338d7250,ffff80003c9d3e90,ffff80003c9d3de0) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80003c9d3e90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c9d3e90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd40f1cc9d90, count: 4
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> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xfffffd806ccf4a20, 0x7d488207c18, 0, 1) -> e
ddb> trace
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 rbe_remove_color sys/kern/subr_tree.c:271 [inline]
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 rbe_remove sys/kern/subr_tree.c:384 [inline]
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 sys/kern/subr_tree.c:395
brelse(fffffd800e003030) at brelse+0x2f9 sys/kern/vfs_bio.c:891
vinvalbuf(fffffd8064a5e5e8,2,fffffd8007ffd410,ffff8000338d7250,0,ffffffffffffffff) at vinvalbuf+0x539 sys/kern/vfs_subr.c:1997
ffs_truncate(fffffd806c929900,0,4,fffffd8007ffd410) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1
ffs_write(ffff80003c9d3b80) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffffd8064a5e5e8,ffff80003c9d3d38,7,fffffd8007ffd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806cc2f088,ffff80003c9d3d38,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff8000338d7250,3,ffff80003c9d3d38,0,ffff80003c9d3de0) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_write(ffff8000338d7250,ffff80003c9d3e90,ffff80003c9d3de0) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80003c9d3e90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c9d3e90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd40f1cc9d90, count: -11
ddb> show registers
rdi                              0x1
rsi                          0x80000    acpi_pdirpa+0x6be71
rbp               0xffff80003c9d37a0
rbx               0xfffffd806c36d258
rdx               0xffff8000016b3e00
rcx               0xfffffd800e003030
rax                          0x7ffff    acpi_pdirpa+0x6be70
r8                                 0
r9                0xffffffffffffffff
r10                                0
r11               0xadb2317816258ffb
r12               0xfffffd8077cf8690
r13               0xffffffff8360f000    buf_rb_bufs_RBT_INFO
r14                       0x83871000    __kernel_virt_to_phys+0x3871000
r15                    0x7d488207c00
rip               0xffffffff81adad18    _rb_remove+0x5a8
cs                               0x8
rflags                       0x10206    __ALIGN_SIZE+0xf206
rsp               0xffff80003c9d3720
ss                                 0
_rb_remove+0x5a8:       movl    0x18(%r15),%r14d
ddb> show proc
PROC (syz-executor) tid=325158 pid=12468 tcnt=5 stat=onproc
    flags process=0 proc=4000000<THREAD>
    runpri=17, usrpri=83, slppri=17, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80003a8f6d28,0xffff8000338d6d30
    process=0xffff80002a7b3190 user=0xffff80003c9ce000, vmspace=0xfffffd806ccf4a20
    estcpu=33, cpticks=3, pctcpu=0.1, user=0, sys=3, intr=0
ddb> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 32836  465887  13957      0  3        0x80  nanoslp       syz-executor
 32836  506995  13957      0  3   0x4000080  rest          syz-executor
 32836  232673  13957      0  3   0x4000080  fsleep        syz-executor
 92831  198495  89460      0  2           0                syz-executor
 92831   48127  89460      0  2   0x4000000                syz-executor
 93547  268010  71319      0  2           0                syz-executor
 93547  143590  71319      0  3   0x4000080  fsleep        syz-executor
 83527  476531   3064      0  2           0                syz-executor
 83527  511335   3064      0  3   0x4000080  fsleep        syz-executor
 83527  524165   3064      0  3   0x4000080  fsleep        syz-executor
 12468  159230  95967      0  3        0x80  nanoslp       syz-executor
*12468  325158  95967      0  7   0x4000000                syz-executor
 12468  312909  95967      0  3   0x4000000  inode         syz-executor
 12468   35036  95967      0  3   0x4000000  inode         syz-executor
 12468  268765  95967      0  3   0x4000080  fsleep        syz-executor
 95967  240994  70442      0  3        0x82  nanoslp       syz-executor
 43881  240421      0      0  3     0x14280  nfsidl        nfsio
 92669  390809      0      0  3     0x14280  nfsidl        nfsio
 71780  336568      0      0  3     0x14280  nfsidl        nfsio
 10310   62308      0      0  3     0x14280  nfsidl        nfsio
 42543  152160      0      0  3     0x14280  nfsidl        nfsio
 99207  419691      0      0  3     0x14280  nfsidl        nfsio
  9874  132895      0      0  3     0x14280  nfsidl        nfsio
 48487  181349      0      0  3     0x14280  nfsidl        nfsio
 12347   77438      0      0  3     0x14280  nfsidl        nfsio
 46600  356534      0      0  3     0x14280  nfsidl        nfsio
 52979  444609      0      0  3     0x14280  nfsidl        nfsio
 23253  404265      0      0  3     0x14280  nfsidl        nfsio
 68006  339922      0      0  3     0x14280  nfsidl        nfsio
 96100  341024      0      0  3     0x14280  nfsidl        nfsio
 22819  377222      0      0  3     0x14280  nfsidl        nfsio
  3999  339575      0      0  3     0x14280  nfsidl        nfsio
 74033  412832      0      0  3     0x14280  nfsidl        nfsio
  8623  117050      0      0  3     0x14280  nfsidl        nfsio
 70457  400620      0      0  3     0x14280  nfsidl        nfsio
 18783  509269      0      0  3     0x14280  nfsidl        nfsio
 34128  296887      0      0  3     0x14200  acct          acct
 85708  126791      1      0  3    0x100083  ttyopn        getty
 89460  510847  70442      0  2       0xc82                syz-executor
 73585  223107  70442      0  3        0x82  piperd        syz-executor
 47380  510194  70442      0  3        0x82  wait          syz-executor
  3064  137383  70442      0  3        0x82  nanoslp       syz-executor
 62229  424674  70442      0  2         0x2                syz-executor
 13957  276192  70442      0  3        0x82  nanoslp       syz-executor
 71319  132704  70442      0  3        0x82  nanoslp       syz-executor
 70442  487547  20686      0  3        0x82  nanoslp       syz-executor
 20686  239220  86109      0  3    0x10008a  sigsusp       ksh
 86109  207871  41974      0  3        0x98  kqread        sshd-session
 41974  372612  40756      0  3        0x92  kqread        sshd-session
 40756   86816      1      0  3        0x88  kqread        sshd
  3443  260373  12771     73  3   0x1100090  kqread        syslogd
 12771  363761      1      0  3    0x100082  sbwait        syslogd
 83734  230871      1      0  3    0x100080  kqread        resolvd
 94288  449875  22594     77  3    0x100092  kqread        dhcpleased
 38067  164703  22594     77  3    0x100092  kqread        dhcpleased
 22594  346355      1      0  3        0x80  kqread        dhcpleased
 65353   57341      0      0  3     0x14200  bored         smr
 46831  275804      0      0  2     0x14200                zerothread
  4245  225657      0      0  3     0x14200  aiodoned      aiodoned
 93506  477356      0      0  3     0x14200  syncer        update
 20635  246704      0      0  3     0x14200  cleaner       cleaner
 70079  170820      0      0  3     0x14200  reaper        reaper
 20007  276880      0      0  3     0x14200  pgdaemon      pagedaemon
 77621  162403      0      0  3     0x14200  bored         viomb
 85866  341436      0      0  3  0x40014200  acpi0         acpi0
 93003  255004      0      0  2     0x14200                softnet0
 59719  319059      0      0  3     0x14200  bored         systqmp
 86897   75377      0      0  3     0x14200  bored         systq
 83485  476074      0      0  3  0x40014200  tmoslp        softclock
  9033  509255      0      0  3  0x40014200                idle0
     1  344360      0      0  3        0x82  wait          init
     0       0     -1      0  3  0x10010200  scheduler     swapper
ddb> show all locks
No such command
ddb> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 11056  12250K   12733K 166960K     13752        0
            pcb    17     17K      19K 166960K       295        0
         rtable   237     10K      11K 166960K       638        0
             pf    31     13K      17K 166960K       131        0
         ifaddr    38      7K       8K 166960K        94        0
        ifgroup    43      1K       2K 166960K       148        0
         sysctl     4      1K       9K 166960K        29        0
       counters    32     17K      18K 166960K       116        0
       ioctlops     0      0K       8K 166960K       432        0
            iov     0      0K      16K 166960K        80        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1411     89K      89K 166960K      2615        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       5K 166960K         4        0
         VM map     2      1K       1K 166960K         2        0
            sem    12      0K       1K 166960K        95        0
        dirhash    12      2K       2K 166960K        30        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    16     57K      85K 166960K      1025        0
          sigio     0      0K       0K 166960K        19        0
           proc    60     59K      91K 166960K       624        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        75        0
       in_multi    88      6K       7K 166960K       146        0
    ether_multi     1      0K       0K 166960K         7        0
            mrt     0      0K       0K 166960K        17        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys    91    413K     413K 166960K        91        0
           exec     0      0K       1K 166960K       500        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   215    143K     158K 166960K     10860        0
       UVM aobj    33     14K      14K 166960K        35        0
     pinsyscall    37     74K      92K 166960K      2149        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     0      0K       1K 166960K        53        0
            NDP    10      0K       1K 166960K        63        0
           temp    80   9076K    9141K 166960K     33266        0
         kqueue    15     24K      34K 166960K       213        0
      SYN cache     2     16K      16K 166960K         2        0
ddb> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb      120      129    0      126     1     0     1     1     0     8    0
rtentry    136      160    0       67     4     0     4     4     0     8    0
unpcb      144      657    0      640     4     3     1     4     0     8    0
syncache   336        3    0        3     1     1     0     1     0     8    0
tcpqe       32        8    0        8     1     1     0     1     0     8    0
tcpcb      736      244    0      239     1     0     1     1     0     8    0
arp         96       22    0        5     1     0     1     1     0     8    0
ipq         40        7    0        1     1     0     1     1     0     8    0
ipqe        40       13    0        4     1     0     1     1     0     8    0
inpcb      328     1164    0     1155    19    17     2    12     0     8    1
ip6q        72        7    0        2     1     0     1     1     0     8    0
ip6af       40       12    0        6     1     0     1     1     0     8    0
nd6        112       39    0       19     1     0     1     1     0     8    0
pkpcb       40        5    0        5     1     1     0     1     0     8    0
kcovpl      48        9    0        1     1     0     1     1     0     8    0
mppekey    1024       2    0        2     1     1     0     1     0     8    0
ppxss      1072      70    0       70     3     3     0     1     0     8    0
pppxif     1384       7    0        7     1     1     0     1     0     8    0
pfstscr     40        4    0        4     1     1     0     1     0     8    0
pfrktable  1344       1    0        1     1     1     0     1     0     8    0
pfstlim    224        1    0        1     1     1     0     1     0     8    0
pfanchor   1288       3    0        3     1     1     0     1     0     8    0
pftag       88        1    0        0     1     0     1     1     0     8    0
pfqueue    320        1    0        0     1     0     1     1     0     8    0
pfstitem    24        2    0        0     1     0     1     1     0     8    0
pfstkey    128       10    0        8     2     1     1     1     0     8    0
pfstate    384        5    0        4     2     1     1     1     0     8    0
pfrule     1360       6    0        6     2     2     0     1     0     8    0
art_heap8  4096       4    0        0     4     0     4     4     0     8    0
art_heap4  256      648    0      228    30     3    27    30     0     8    0
art_table   40      652    0      228     5     0     5     5     0     8    0
art_node    32      158    0       74     1     0     1     1     0     8    0
sysvmsgpl   40       20    0       14     1     0     1     1     0     8    0
semupl     112        2    0        2     1     1     0     1     0     8    0
semapl     112       91    0       81     1     0     1     1     0     8    0
shmpl      112       27    0        1     1     0     1     1     0     8    0
dirhash    1024      29    0       12     3     0     3     3     0     8    0
dino2pl    256     3568    0     2119    92     0    92    92     0     8    0
ffsino     256     3569    0     2119    92     0    92    92     0     8    0
nchpl      144     5041    0     3344    64     0    64    64     0     8    0
rtmask      32        7    0        7     1     1     0     1     0     8    0
vnodes     216     4262    0        0   237     0   237   237     0     8    0
namei      1024   17044    0    17041     2     1     1     1     0     8    0
vcpupl     3904       5    0        1     1     0     1     1     0     8    0
vmpool     808        5    0        1     1     0     1     1     0     8    0
kstatmem   264       88    0       68     3     1     2     3     0     8    0
scsiplug    72        4    0        4     1     1     0     1     0     8    0
scxspl     216    21661    0    21661     8     7     1     8     1     8    1
plimitpl   152      419    0      401     1     0     1     1     0     8    0
sigapl     424     1340    0     1278     8     0     8     8     0     8    0
knotepl    120    52855    0    52566    38    29     9    18     0     8    0
kqueuepl   184      366    0      354     5     4     1     3     0     8    0
pipepl     304      266    0      236     3     0     3     3     0     8    0
fdescpl    448     1305    0     1277     4     0     4     4     0     8    0
filepl     120     8953    0     8729    15     7     8    11     0     8    0
lockfpl    104      324    0      321     1     0     1     1     0     8    0
lockfspl    48      148    0      145     1     0     1     1     0     8    0
sessionpl  144       23    0       15     1     0     1     1     0     8    0
pgrppl      48       41    0       25     1     0     1     1     0     8    0
ucredpl    104     1906    0     1895     1     0     1     1     0     8    0
zombiepl   144     1354    0     1353     1     0     1     1     0     8    0
processpl  1152    1340    0     1278     5     0     5     5     0     8    0
procpl     664     2702    0     2630     7     0     7     7     0     8    0
sosppl     176       11    0       11     3     3     0     1     0     8    0
sockpl     552     1988    0     1959    17    14     3    12     0     8    0
mcl64k     65536    120    0      117     1     0     1     1     0     8    0
mcl16k     16384      3    5        3     1     1     0     1     0     8    0
mcl12k     12288      2    6        2     1     1     0     1     0     8    0
mcl9k      9216       3    1        3     1     1     0     1     0     8    0
mcl8k      8192      19   12       19     1     1     0     1     0     8    0
mcl4k      4096    3665   92     3611    14     7     7    14     0     8    0
mcl2k      2048    1107    0     1097     4     2     2     4     0     8    0
mtagpl      96       62    0       16     2     0     2     2     0     8    0
mbufpl     256    14254    0    14051    21     4    17    21     0     8    0
bufpl      280     7685    0     1467   445     0   445   445     0     8    0
bufpl: pool(0xffffffff839dc9a8:bufpl): page inconsistency: page 0x0; at page head addr 0xfffffd806c36df90 (p 0xfffffd806c36d000)
anonpl      24   199330    0   191365    77    28    49    57     0   187    0
amapchunkpl 152   37235    0    36771    44    21    23    30     0   158    0
amappl16   200     3665    0     3352    34    17    17    17     0     8    0
amappl15   192        3    0        3     1     1     0     1     0     8    0
amappl14   184      424    0      423     1     0     1     1     0     8    0
amappl13   176      115    0      105     1     0     1     1     0     8    0
amappl12   168     1556    0     1529     2     0     2     2     0     8    0
amappl11   160        6    0        6     1     1     0     1     0     8    0
amappl10   152       75    0       65     1     0     1     1     0     8    0
amappl9    144      260    0      259     1     0     1     1     0     8    0
amappl8    136      102    0      101     1     0     1     1     0     8    0
amappl7    128       50    0       48     1     0     1     1     0     8    0
amappl6    120      263    0      252     1     0     1     1     0     8    0
amappl5    112       97    0       90     1     0     1     1     0     8    0
amappl4    104      448    0      414     2     1     1     2     0     8    0
amappl3     96     6295    0     6211     3     0     3     3     0     8    0
amappl2     88     1397    0     1331     2     0     2     2     0     8    0
amappl1     80    12742    0    12211    12     0    12    12     0     8    0
amappl      88     9976    0     9823     5     0     5     5     0    92    0
uvmvnodes   80      133    0        0     3     0     3     3     0     8    0
dma32768   32768      1    0        1     1     1     0     1     0     8    0
dma8192    8192       1    0        1     1     1     0     1     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     1     1     0     1     0     8    0
dma64       64        7    0        7     2     1     1     1     0     8    1
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       34    0        2     1     0     1     1     0     8    0
uaddrrnd    24     1305    0     1277     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24     1305    0     1277     1     0     1     1     0     8    0
vmmpekpl   168    11521    0    11472     3     0     3     3     0     8    0
vmmpepl    168    86731    0    84689   105    11    94    94     0   357    0
vmsppl     368     1304    0     1277     4     1     3     4     0     8    0
rwobjpl     40    24159    0    22874    14     0    14    14     0     8    0
pdppl      4096    2626    0     2560   102    31    71    76     0     8    5
pvpl        32   575249    0   561683   188    74   114   133     0   265    1
pmappl     216     1309    0     1278     2     0     2     2     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      386    0       59    11     0    11    11     0     8    0
ddb> machine ddbcpu 0
No such command
ddb> trace
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 rbe_remove_color sys/kern/subr_tree.c:271 [inline]
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 rbe_remove sys/kern/subr_tree.c:384 [inline]
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 sys/kern/subr_tree.c:395
brelse(fffffd800e003030) at brelse+0x2f9 sys/kern/vfs_bio.c:891
vinvalbuf(fffffd8064a5e5e8,2,fffffd8007ffd410,ffff8000338d7250,0,ffffffffffffffff) at vinvalbuf+0x539 sys/kern/vfs_subr.c:1997
ffs_truncate(fffffd806c929900,0,4,fffffd8007ffd410) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1
ffs_write(ffff80003c9d3b80) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffffd8064a5e5e8,ffff80003c9d3d38,7,fffffd8007ffd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806cc2f088,ffff80003c9d3d38,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff8000338d7250,3,ffff80003c9d3d38,0,ffff80003c9d3de0) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_write(ffff8000338d7250,ffff80003c9d3e90,ffff80003c9d3de0) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80003c9d3e90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c9d3e90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd40f1cc9d90, count: -11
ddb> machine ddbcpu 1
No such command
ddb> trace
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 rbe_remove_color sys/kern/subr_tree.c:271 [inline]
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 rbe_remove sys/kern/subr_tree.c:384 [inline]
_rb_remove(ffffffff8360f000,fffffd8064a5e650,fffffd800e003030) at _rb_remove+0x5a8 sys/kern/subr_tree.c:395
brelse(fffffd800e003030) at brelse+0x2f9 sys/kern/vfs_bio.c:891
vinvalbuf(fffffd8064a5e5e8,2,fffffd8007ffd410,ffff8000338d7250,0,ffffffffffffffff) at vinvalbuf+0x539 sys/kern/vfs_subr.c:1997
ffs_truncate(fffffd806c929900,0,4,fffffd8007ffd410) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1
ffs_write(ffff80003c9d3b80) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffffd8064a5e5e8,ffff80003c9d3d38,7,fffffd8007ffd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806cc2f088,ffff80003c9d3d38,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff8000338d7250,3,ffff80003c9d3d38,0,ffff80003c9d3de0) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_write(ffff8000338d7250,ffff80003c9d3e90,ffff80003c9d3de0) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80003c9d3e90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c9d3e90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd40f1cc9d90, count: -11

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/12 13:20 openbsd fd49698d88e5 4efadf07 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: _rb_remove
* Struck through repros no longer work on HEAD.