syzbot


uvm_fault: _rb_remove

Status: upstream: reported on 2026/03/12 13:20
Reported-by: syzbot+230923220bfd54de985e@syzkaller.appspotmail.com
First crash: 8d20h, last: 9h20m

Sample crash report:
uvm_fault(0xfffffd807ece9e60, 0x80010031, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at      _rb_remove+0xa45:       movq    %r12,0(%r15)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*382248  48169      0         0x2        0x1    0  syz-executor
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_rotate_right sys/kern/subr_tree.c:141 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_remove_color sys/kern/subr_tree.c:296 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_remove sys/kern/subr_tree.c:384 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 sys/kern/subr_tree.c:395
brelse(fffffd806a98c8d8) at brelse+0x2f9 sys/kern/vfs_bio.c:891
vinvalbuf(fffffd806d868da8,2,ffffffffffffffff,ffff80002a787768,0,ffffffffffffffff) at vinvalbuf+0x539 sys/kern/vfs_subr.c:1997
ffs_truncate(fffffd800be06e00,0,0,ffffffffffffffff) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1
ufs_inactive(ffff80002a80fab0) at ufs_inactive+0x1ff sys/ufs/ufs/ufs_inode.c:84
VOP_INACTIVE(fffffd806d868da8,ffff80002a787768) at VOP_INACTIVE+0xfb sys/kern/vfs_vops.c:498
vrele(fffffd806d868da8) at vrele+0x120 sys/kern/vfs_subr.c:837
ktrwriteraw(ffff80002a787768,fffffd806d868da8,fffffd8007ffd138,ffff80002a80fc50,ffff80002a80fc30) at ktrwriteraw+0x33d ktrcleartrace sys/kern/kern_ktrace.c:86 [inline]
ktrwriteraw(ffff80002a787768,fffffd806d868da8,fffffd8007ffd138,ffff80002a80fc50,ffff80002a80fc30) at ktrwriteraw+0x33d sys/kern/kern_ktrace.c:710
ktrsysret(ffff80002a787768,35,0,ffff80002a80fd10) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80002a787768,35,0,ffff80002a80fd10) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209
syscall(ffff80002a80fdc0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80002a80fdc0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6ff11c564250, 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(0xfffffd807ece9e60, 0x80010031, 0, 2) -> e
ddb> trace
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_rotate_right sys/kern/subr_tree.c:141 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_remove_color sys/kern/subr_tree.c:296 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_remove sys/kern/subr_tree.c:384 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 sys/kern/subr_tree.c:395
brelse(fffffd806a98c8d8) at brelse+0x2f9 sys/kern/vfs_bio.c:891
vinvalbuf(fffffd806d868da8,2,ffffffffffffffff,ffff80002a787768,0,ffffffffffffffff) at vinvalbuf+0x539 sys/kern/vfs_subr.c:1997
ffs_truncate(fffffd800be06e00,0,0,ffffffffffffffff) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1
ufs_inactive(ffff80002a80fab0) at ufs_inactive+0x1ff sys/ufs/ufs/ufs_inode.c:84
VOP_INACTIVE(fffffd806d868da8,ffff80002a787768) at VOP_INACTIVE+0xfb sys/kern/vfs_vops.c:498
vrele(fffffd806d868da8) at vrele+0x120 sys/kern/vfs_subr.c:837
ktrwriteraw(ffff80002a787768,fffffd806d868da8,fffffd8007ffd138,ffff80002a80fc50,ffff80002a80fc30) at ktrwriteraw+0x33d ktrcleartrace sys/kern/kern_ktrace.c:86 [inline]
ktrwriteraw(ffff80002a787768,fffffd806d868da8,fffffd8007ffd138,ffff80002a80fc50,ffff80002a80fc30) at ktrwriteraw+0x33d sys/kern/kern_ktrace.c:710
ktrsysret(ffff80002a787768,35,0,ffff80002a80fd10) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80002a787768,35,0,ffff80002a80fd10) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209
syscall(ffff80002a80fdc0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80002a80fdc0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6ff11c564250, count: -11
ddb> show registers
rdi                                0
rsi                              0x1
rbp               0xffff80002a80f740
rbx               0xfffffd806a173238
rdx                                0
rcx               0xfffffd806a98c8d8
rax               0xffff80002a787768
r8                                 0
r9                0xffffffffffffffff
r10               0x27b0bff42c89e352
r11               0xd2915749f92595cf
r12               0xfffffd8068f80c18
r13               0xffffffff8376ca00    buf_rb_bufs_RBT_INFO
r14               0xfffffd806a173238
r15                       0x80010031    __kernel_virt_to_phys+0x10031
rip               0xffffffff82870c25    _rb_remove+0xa45
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80002a80f6c0
ss                                 0
_rb_remove+0xa45:       movq    %r12,0(%r15)
ddb> show proc
PROC (syz-executor) tid=382248 pid=48169 tcnt=1 stat=onproc
    flags process=2<EXEC> proc=1<INKTR>
    runpri=17, usrpri=50, slppri=17, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80002a7862a8,0xffff80002a787a10
    process=0xffff80002a7bc490 user=0xffff80002a80a000, vmspace=0xfffffd807ece9e60
    estcpu=36, cpticks=23, pctcpu=0.0, user=4, sys=19, intr=0
ddb> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 44503  260048  59021      0  2           0                syz-executor
 44503  151131  59021      0  2   0x4000000                syz-executor
 84549  326229  49751      0  2   0x4081000                syz-executor
 84549   88492  49751      0  3   0x4003000  suspend       syz-executor
 30553  278480      0      0  3     0x14200  acct          acct
 49751  154594  74657      0  3        0x82  wait          syz-executor
 59021  182783  74657      0  2       0xc82                syz-executor
 47786  421826  74657      0  2         0x2                syz-executor
 29024  490894  74657      0  2         0x2                syz-executor
 86582   82316  74657      0  2         0x2                syz-executor
 38131  522463  74657      0  2         0x2                syz-executor
*48169  382248  74657      0  7         0x3                syz-executor
 23970   42682  74657      0  2         0x2                syz-executor
 74657  413104  84602      0  3        0x82  kqread        syz-executor
 84602  341506  82492      0  3    0x10008a  sigsusp       ksh
 82492   32982  31615      0  3        0x98  kqread        sshd-session
 31615  412172  26663      0  3        0x92  kqread        sshd-session
 39627  111182      1      0  3    0x100083  ttyopn        getty
 26663  260141      1      0  3        0x88  kqread        sshd
 77720  219987  62637     73  3   0x1100090  kqread        syslogd
 62637  314287      1      0  3    0x100082  sbwait        syslogd
 84086  446003      1      0  3    0x100080  kqread        resolvd
 37721   78867  90619     77  3    0x100092  kqread        dhcpleased
 41714  125652  90619     77  3    0x100092  kqread        dhcpleased
 90619  316431      1      0  3        0x80  kqread        dhcpleased
 22117  275753      0      0  3     0x14200  bored         smr
 49479  314510      0      0  2     0x14200                zerothread
 58598  498681      0      0  3     0x14200  aiodoned      aiodoned
 10552   77092      0      0  3     0x14200  syncer        update
 96969  343981      0      0  3     0x14200  cleaner       cleaner
 72981  463890      0      0  3     0x14200  reaper        reaper
 54542  348810      0      0  3     0x14200  pgdaemon      pagedaemon
 56833  102535      0      0  3     0x14200  bored         viomb
 14489  514275      0      0  3  0x40014200  acpi0         acpi0
 24318  319672      0      0  2     0x14200                softnet0
 16761  516504      0      0  2     0x14200                systqmp
 84680    2374      0      0  3     0x14200  bored         systq
 27814  116093      0      0  2  0x40014200                softclock
  9447  522636      0      0  3  0x40014200                idle0
     1  191319      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 11069  12121K   13339K 166960K     15289        0
            pcb    17     17K      23K 166960K       463        0
         rtable   223     18K      18K 166960K       574        0
             pf    34     13K      17K 166960K       175        0
         ifaddr    36      6K       8K 166960K       105        0
        ifgroup    47      1K       2K 166960K       180        0
         sysctl     4      1K       9K 166960K        19        0
       counters    33     17K      18K 166960K       101        0
       ioctlops     0      0K       4K 166960K       300        0
            iov     0      0K      24K 166960K        98        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1414     89K      89K 166960K      2947        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       9K 166960K        25        0
         VM map     2      1K       1K 166960K         2        0
            sem    12      3K       3K 166960K       115        0
        dirhash    12      2K       2K 166960K        33        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    14     49K      97K 166960K      1432        0
          sigio     0      0K       0K 166960K        27        0
           proc    60     59K     124K 166960K       651        0
        subproc    72      4K       4K 166960K        82        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     16K      16K 166960K         1        0
    ip_moptions     0      0K       0K 166960K       174        0
       in_multi    74      5K       7K 166960K       150        0
    ether_multi     1      0K       0K 166960K        13        0
            mrt     0      0K       0K 166960K        36        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys   229   1023K    1023K 166960K       229        0
           exec     0      0K       1K 166960K       751        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   188    151K     186K 166960K     15428        0
       UVM aobj    21     10K      10K 166960K        23        0
     pinsyscall    35     70K      96K 166960K      2629        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     0      0K       0K 166960K        85        0
            NDP    11      0K       2K 166960K        77        0
           temp    72   9074K    9202K 166960K     59598        0
         kqueue    13     20K      30K 166960K       311        0
      SYN cache     2      8K      16K 166960K         3        0
ddb> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb      120      196    0      193     3     0     3     3     0     8    2
rtentry    136      156    0       73     4     0     4     4     0     8    0
unpcb      144     1024    0     1009     5     0     5     5     0     8    4
syncache   336       12    0       12     2     1     1     1     0     8    1
tcpqe       32        5    0        5     2     1     1     1     0     8    1
tcpcb      736      673    0      669    13     4     9    10     0     8    8
arp         96       25    0        9     1     0     1     1     0     8    0
ipq         40        9    0        9     1     0     1     1     0     8    1
ipqe        40       12    0       12     1     0     1     1     0     8    1
inpcb      328     1738    0     1731    13     4     9    10     0     8    8
nd6        112       35    0       14     1     0     1     1     0     8    0
pkpcb       40        9    0        9     2     1     1     1     0     8    1
kcovpl      48        9    0        1     1     0     1     1     0     8    0
mppekey    1024       1    0        1     1     0     1     1     0     8    1
ppxss      1072      54    0       54     2     1     1     1     0     8    1
pppxif     1384       6    0        6     2     1     1     1     0     8    1
pfstscr     40        1    0        1     1     0     1     1     0     8    1
pfrktable  1344       6    0        4     1     0     1     1     0     8    0
pfsrclim   320        5    0        4     1     0     1     1     0     8    0
pfstlim    224        1    0        1     1     0     1     1     0     8    1
pfanchor   1288       5    0        3     2     1     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        8    0        4     1     0     1     1     0     8    0
pfstate    384        5    0        3     1     0     1     1     0     8    0
pfrule     1360      16    0       14     2     1     1     1     0     8    0
rttmr      136        3    0        3     1     0     1     1     0     8    1
art_heap8  4096       3    0        0     3     0     3     3     0     8    0
art_heap4  256      658    0      279    31     1    30    31     0     8    5
art_table   40      661    0      279     5     0     5     5     0     8    0
art_node    32      154    0       80     1     0     1     1     0     8    0
sysvmsgpl   40       11    0        5     1     0     1     1     0     8    0
semupl     112        3    0        3     2     1     1     1     0     8    1
semapl     112      102    0       92     1     0     1     1     0     8    0
shmpl      112       15    0        1     1     0     1     1     0     8    0
dirhash    1024      31    0       14     3     0     3     3     0     8    0
dino2pl    256     4144    0     2700    92     0    92    92     0     8    0
ffsino     256     4145    0     2700    92     0    92    92     0     8    0
nchpl      144     6144    0     4463    64     0    64    64     0     8    0
rtmask      32        9    0        9     1     0     1     1     0     8    1
vnodes     216     5194    0        0   289     0   289   289     0     8    0
namei      1024   22231    0    22230     3     1     2     2     0     8    1
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      114    0       92     2     0     2     2     0     8    0
acpiwqpl    32        2    0        2     1     0     1     1     1     8    1
scsiplug    72        8    0        8     2     1     1     1     0     8    1
scxspl     216    21489    0    21489     9     7     2     8     1     8    2
plimitpl   152      495    0      479     1     0     1     1     0     8    0
sigapl     424     1743    0     1703     6     0     6     6     0     8    1
knotepl    120   109157    0   109110    39    27    12    17     0     8    8
kqueuepl   184      480    0      471     3     0     3     3     0     8    2
pipepl     304      337    0      310     8     0     8     8     0     8    5
fdescpl    448     1725    0     1699     5     1     4     5     0     8    0
filepl     120    12184    0    11977    14     0    14    14     0     8    7
lockfpl    104      595    0      593     1     0     1     1     0     8    0
lockfspl    48      230    0      228     1     0     1     1     0     8    0
sessionpl  144       31    0       23     1     0     1     1     0     8    0
pgrppl      48      184    0      168     1     0     1     1     0     8    0
ucredpl    104     2100    0     2088     1     0     1     1     0     8    0
zombiepl   144     2481    0     2480     1     0     1     1     0     8    0
processpl  1152    1743    0     1703     4     0     4     4     0     8    0
procpl     664     4007    0     3964     7     1     6     6     0     8    1
sosppl     176       11    0       11     2     1     1     1     0     8    1
sockpl     552     3080    0     3055    14     4    10    13     0     8    8
mcl64k     65536     97    0       96     1     0     1     1     0     8    0
mcl16k     16384      2    0        2     1     0     1     1     0     8    1
mcl12k     12288      1    0        1     1     0     1     1     0     8    1
mcl9k      9216       3    0        3     1     0     1     1     0     8    1
mcl8k      8192      87    0       87     1     0     1     1     0     8    1
mcl4k      4096    4393    0     4339    15     7     8    15     0     8    1
mcl2k2     2112       1    0        1     1     1     0     1     0     8    0
mcl2k      2048    1464    0     1459     3     1     2     2     0     8    1
mtagpl      96       30    0       16     1     0     1     1     0     8    0
mbufpl     256    22591    0    22460    73    50    23    73     0     8    8
bufpl      280     6198    0      113   435     0   435   435     0     8    0
bufpl: pool(0xffffffff839c6c38:bufpl): page inconsistency: page 0x0; at page head addr 0xfffffd806a173f90 (p 0xfffffd806a173000)
anonpl      24   268718    0   264151    78     8    70    70     0   187   27
amapchunkpl 152   53943    0    53542    52     7    45    45     0   158   22
amappl16   200     4011    0     3945    27    14    13    24     0     8    8
amappl15   192       47    0       47     1     1     0     1     0     8    0
amappl14   184      424    0      423     1     0     1     1     0     8    0
amappl13   176      170    0      159     1     0     1     1     0     8    0
amappl12   168     1981    0     1958     2     0     2     2     0     8    0
amappl11   160        7    0        7     1     1     0     1     0     8    0
amappl10   152       61    0       51     1     0     1     1     0     8    0
amappl9    144      259    0      259     1     1     0     1     0     8    0
amappl8    136      119    0      117     1     0     1     1     0     8    0
amappl7    128      161    0      150     1     0     1     1     0     8    0
amappl6    120      185    0      182     1     0     1     1     0     8    0
amappl5    112      113    0      105     1     0     1     1     0     8    0
amappl4    104      306    0      290     1     0     1     1     0     8    0
amappl3     96    10307    0    10227     4     0     4     4     0     8    1
amappl2     88      651    0      595     2     0     2     2     0     8    0
amappl1     80    18572    0    18048    21     2    19    19     0     8    6
amappl      88    14390    0    14266     5     0     5     5     0    92    0
uvmvnodes   80      147    0        0     3     0     3     3     0     8    0
dma32768   32768      1    0        1     1     0     1     1     0     8    1
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       2    0        1     1     0     1     1     0     8    0
dma256     256       10    0       10     2     1     1     1     0     8    1
dma128     128      254    0      254     2     1     1     1     0     8    1
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       20    0       19     1     0     1     1     0     8    0
aobjpl      72       22    0        2     1     0     1     1     0     8    0
uaddrrnd    24     1725    0     1699     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24     1725    0     1699     1     0     1     1     0     8    0
vmmpekpl   168    16720    0    16677     3     0     3     3     0     8    0
vmmpepl    168   119896    0   118290   112     8   104   104     0   357   17
vmsppl     368     1724    0     1699     5     1     4     4     0     8    1
rwobjpl     40    33680    0    32668    16     1    15    15     0     8    1
pdppl      4096    3466    0     3404   148    82    66    82     0     8    4
pvpl        32   839444    0   830414   160    13   147   147     0   265   43
pmappl     216     1729    0     1700     3     0     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      501    0      153    12     0    12    12     0     8    0
ddb> machine ddbcpu 0
No such command
ddb> trace
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_rotate_right sys/kern/subr_tree.c:141 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_remove_color sys/kern/subr_tree.c:296 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_remove sys/kern/subr_tree.c:384 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 sys/kern/subr_tree.c:395
brelse(fffffd806a98c8d8) at brelse+0x2f9 sys/kern/vfs_bio.c:891
vinvalbuf(fffffd806d868da8,2,ffffffffffffffff,ffff80002a787768,0,ffffffffffffffff) at vinvalbuf+0x539 sys/kern/vfs_subr.c:1997
ffs_truncate(fffffd800be06e00,0,0,ffffffffffffffff) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1
ufs_inactive(ffff80002a80fab0) at ufs_inactive+0x1ff sys/ufs/ufs/ufs_inode.c:84
VOP_INACTIVE(fffffd806d868da8,ffff80002a787768) at VOP_INACTIVE+0xfb sys/kern/vfs_vops.c:498
vrele(fffffd806d868da8) at vrele+0x120 sys/kern/vfs_subr.c:837
ktrwriteraw(ffff80002a787768,fffffd806d868da8,fffffd8007ffd138,ffff80002a80fc50,ffff80002a80fc30) at ktrwriteraw+0x33d ktrcleartrace sys/kern/kern_ktrace.c:86 [inline]
ktrwriteraw(ffff80002a787768,fffffd806d868da8,fffffd8007ffd138,ffff80002a80fc50,ffff80002a80fc30) at ktrwriteraw+0x33d sys/kern/kern_ktrace.c:710
ktrsysret(ffff80002a787768,35,0,ffff80002a80fd10) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80002a787768,35,0,ffff80002a80fd10) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209
syscall(ffff80002a80fdc0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80002a80fdc0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6ff11c564250, count: -11
ddb> machine ddbcpu 1
No such command
ddb> trace
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_rotate_right sys/kern/subr_tree.c:141 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_remove_color sys/kern/subr_tree.c:296 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 rbe_remove sys/kern/subr_tree.c:384 [inline]
_rb_remove(ffffffff8376ca00,fffffd806d868e10,fffffd806a98c8d8) at _rb_remove+0xa45 sys/kern/subr_tree.c:395
brelse(fffffd806a98c8d8) at brelse+0x2f9 sys/kern/vfs_bio.c:891
vinvalbuf(fffffd806d868da8,2,ffffffffffffffff,ffff80002a787768,0,ffffffffffffffff) at vinvalbuf+0x539 sys/kern/vfs_subr.c:1997
ffs_truncate(fffffd800be06e00,0,0,ffffffffffffffff) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1
ufs_inactive(ffff80002a80fab0) at ufs_inactive+0x1ff sys/ufs/ufs/ufs_inode.c:84
VOP_INACTIVE(fffffd806d868da8,ffff80002a787768) at VOP_INACTIVE+0xfb sys/kern/vfs_vops.c:498
vrele(fffffd806d868da8) at vrele+0x120 sys/kern/vfs_subr.c:837
ktrwriteraw(ffff80002a787768,fffffd806d868da8,fffffd8007ffd138,ffff80002a80fc50,ffff80002a80fc30) at ktrwriteraw+0x33d ktrcleartrace sys/kern/kern_ktrace.c:86 [inline]
ktrwriteraw(ffff80002a787768,fffffd806d868da8,fffffd8007ffd138,ffff80002a80fc50,ffff80002a80fc30) at ktrwriteraw+0x33d sys/kern/kern_ktrace.c:710
ktrsysret(ffff80002a787768,35,0,ffff80002a80fd10) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80002a787768,35,0,ffff80002a80fd10) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209
syscall(ffff80002a80fdc0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80002a80fdc0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6ff11c564250, count: -11

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/21 00:03 openbsd 65032adb4937 85bf2a64 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: _rb_remove
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.