syzbot


uvm_fault: pmap_page_remove (7)

Status: upstream: reported on 2025/11/11 16:24
Reported-by: syzbot+4f31ad0ccb0a35f3f07a@syzkaller.appspotmail.com
First crash: 27d, last: 14d
Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd uvm_fault: pmap_page_remove (4) -1 1 1327d 1327d 0/3 auto-closed as invalid on 2022/07/20 03:20
openbsd uvm_fault: pmap_page_remove (5) -1 16 419d 730d 0/3 auto-obsoleted due to no activity on 2025/01/12 21:41
openbsd uvm_fault: pmap_page_remove -1 7 2271d 2528d 0/3 auto-closed as invalid on 2019/12/19 05:38
openbsd uvm_fault: pmap_page_remove (6) -1 1 150d 150d 0/3 auto-obsoleted due to no activity on 2025/10/08 23:25
openbsd uvm_fault: pmap_page_remove (3) -1 1 1396d 1396d 0/3 closed as invalid on 2022/02/15 06:33
openbsd uvm_fault: pmap_page_remove (2) -1 5 1948d 2124d 0/3 auto-closed as invalid on 2020/11/06 07:50

Sample crash report:
uvm_fault(0xfffffd806caa5018, 0x7f864ce51370, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at  pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 427116  22772      0           0          0    0  syz-executor
pmap_page_remove(fffffd80085618a8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffffd80085618a8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014
uvm_anfree_list(fffffd80680f1e28,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112
amap_wipeout(fffffd806cc440c0) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80002a370410,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806caa5018) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
exit1(ffff8000313d9ca8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff8000313d9ca8,ffff80002a3705e0,ffff80002a370530) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a3705e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3705e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7166d260d4b0, count: 6
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(0xfffffd806caa5018, 0x7f864ce51370, 0, 2) -> e
ddb{1}> trace
pmap_page_remove(fffffd80085618a8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffffd80085618a8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014
uvm_anfree_list(fffffd80680f1e28,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112
amap_wipeout(fffffd806cc440c0) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80002a370410,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806caa5018) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
exit1(ffff8000313d9ca8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff8000313d9ca8,ffff80002a3705e0,ffff80002a370530) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a3705e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3705e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7166d260d4b0, count: -9
ddb{1}> show registers
rdi                                0
rsi                                0
rbp               0xffff80002a370310
rbx               0xfffffd8069b9e970
rdx                                0
rcx                   0x7f8000000000
rax                                0
r8                                 0
r9                0xffff80002a370300
r10                0x764fbb51120517e
r11               0xf828528c71a33f3a
r12                                0
r13                                0
r14                      0x64ce51370
r15               0xfffffd8008561910
rip               0xffffffff82977a1d   pmap_page_remove+0x45d
cs                               0x8
rflags                       0x10246   __ALIGN_SIZE+0xf246
rsp               0xffff80002a370290
ss                                 0
pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
ddb{1}> show proc
PROC (syz-executor) tid=439179 pid=59402 tcnt=0 stat=onproc
    flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
    runpri=26, usrpri=79, slppri=26, nice=20
    wchan=0x0, wmesg=, ps_single=0xffff8000313d9ca8 scnt=-1 ecnt=1
    forw=0xffffffffffffffff, list=0xffff8000313da558,0xffff8000fffef4e8
    process=0xffff80003c418020 user=0xffff80002a36b000, vmspace=0xfffffd806caa5018
    estcpu=29, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 22772  427116  66832      0  7           0                syz-executor
 22772  299358  66832      0  2   0x4000000                syz-executor
 40735  343113  82988      0  2           0                syz-executor
 40735   69202  82988      0  2   0x4000000                syz-executor
 73125  178829  43553      0  2           0                syz-executor
 73125  458306  43553      0  3   0x4000080  ttyin         syz-executor
 73125  173119  43553      0  2   0x4000000                syz-executor
 21996  435118  68676      0  2           0                syz-executor
 21996  329495  68676      0  3   0x4000080  kqsel         syz-executor
 21996  386324  68676      0  3   0x4000080  fsleep        syz-executor
 31178  382440  35252      0  3        0x80  nanoslp       syz-executor
 31178  277980  35252      0  3   0x4000080  ttyin         syz-executor
 85817  509712  61449      0  2           0                syz-executor
 85817  243976  61449      0  3   0x4000080  ttyin         syz-executor
 85817   75206  61449      0  3   0x4000080  fsleep        syz-executor
 61449  488597  74194      0  3        0x82  nanoslp       syz-executor
 66369  260652  74194      0  3        0x82  nanoslp       syz-executor
 87698  261788  74194      0  3        0x82  wait          syz-executor
 82988  308531  74194      0  2       0xc82                syz-executor
 66832  400835  74194      0  3        0x82  nanoslp       syz-executor
 68676  352659  74194      0  3        0x82  nanoslp       syz-executor
 35252  386949  74194      0  3        0x82  nanoslp       syz-executor
 43553   73345  74194      0  3        0x82  nanoslp       syz-executor
 74194   72639  22874      0  3        0x82  kqread        syz-executor
 22874  199488   7157      0  3    0x10008a  sigsusp       ksh
  7157  516473   5934      0  3        0x98  kqread        sshd-session
  5934  442877  36693      0  3        0x92  kqread        sshd-session
 94577   10377      1      0  3    0x100083  ttyopn        getty
 36693  214151      1      0  3        0x88  kqread        sshd
 16707  176574  97737     74  3   0x1100092  bpf           pflogd
 97737  177229      1      0  3        0x80  sbwait        pflogd
 38623  273265  65262     73  3   0x1100090  kqread        syslogd
 65262  346637      1      0  3    0x100082  sbwait        syslogd
 40101  233736      1      0  3    0x100080  kqread        resolvd
 22799  104935  66574     77  3    0x100092  kqread        dhcpleased
 37418  173161  66574     77  3    0x100092  kqread        dhcpleased
 66574  429682      1      0  3        0x80  kqread        dhcpleased
 78391  233181      0      0  2  0x40014200                smr
 22614  221995      0      0  2     0x14200                zerothread
 74024   68936      0      0  3     0x14200  aiodoned      aiodoned
  7121  315919      0      0  3     0x14200  syncer        update
  7554  100354      0      0  3     0x14200  cleaner       cleaner
 10407  132018      0      0  3     0x14200  reaper        reaper
 67192  411961      0      0  3     0x14200  pgdaemon      pagedaemon
 65352  387707      0      0  3     0x14200  bored         viomb
 11425  373402      0      0  3  0x40014200  acpi0         acpi0
 60197  310025      0      0  3  0x40014200                idle1
 72330  315069      0      0  3     0x14200  bored         softnet1
 50571  504124      0      0  3     0x14200  bored         softnet0
 91913   62377      0      0  3     0x14200  bored         systqmp
 95233  156177      0      0  3     0x14200  bored         systq
 63434  369570      0      0  3     0x14200  tmoslp        softclockmp
 23991  298011      0      0  3  0x40014200  tmoslp        softclock
 16851   60888      0      0  3  0x40014200                idle0
     1   52490      0      0  3        0x82  wait          init
     0       0     -1      0  3  0x10010200  scheduler     swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c93a010)
#0  witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1  mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2  mtx_enter+0x62 sys/kern/kern_lock.c:261
#3  pmap_page_remove+0xca rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#3  pmap_page_remove+0xca pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#3  pmap_page_remove+0xca sys/arch/amd64/amd64/pmap.c:1974
#4  uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112
#5  amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1
#6  uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
#7  uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
#8  exit1+0x6fc sys/kern/kern_exit.c:260
#9  sys_exit+0x1a sys/kern/kern_exit.c:-1
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765
#11 Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10213  11096K   12509K 166960K     13527        0
            pcb    18     18K      34K 166960K       583        0
         rtable   213     10K      11K 166960K       651        0
             pf    35     17K      81K 166960K       140        0
         ifaddr    37      6K       8K 166960K       104        0
        ifgroup    51      2K       2K 166960K       151        0
         sysctl     4      1K       9K 166960K        20        0
       counters    66     36K      37K 166960K       164        0
       ioctlops     0      0K       4K 166960K      1801        0
            iov     0      0K      16K 166960K        75        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1525     96K      96K 166960K      2944        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       9K 166960K        19        0
         VM map     2      1K       1K 166960K         2        0
            sem    12      0K       1K 166960K        58        0
        dirhash    12      2K       2K 166960K        21        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    17     61K     240K 166960K      1308        0
          sigio     0      0K       0K 166960K        27        0
           proc    74    115K     147K 166960K       742        0
        subproc    72      4K       4K 166960K       118        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     16K      16K 166960K         1        0
    ip_moptions     0      0K       0K 166960K       337        0
       in_multi    74      5K       7K 166960K       213        0
    ether_multi     1      0K       0K 166960K        15        0
            mrt     1      0K       0K 166960K         9        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys   109    493K     493K 166960K       109        0
           exec     0      0K       1K 166960K       786        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   253    177K     196K 166960K     13673        0
       UVM aobj   130      9K      10K 166960K       135        0
     pinsyscall    42     84K     104K 166960K      2582        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     2      0K       1K 166960K        99        0
            NDP    11      0K       2K 166960K        73        0
           temp    79   8676K    8836K 166960K     45521        0
         kqueue    15     20K      30K 166960K       232        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      253    0      250     5     2     3     3     0     8    2
rtentry    176      193    0      111     6     0     6     6     0     8    0
unpcb      144      900    0      881     9     5     4     7     0     8    3
syncache   336        9    0        9     3     2     1     1     0     8    1
tcpqe       32        4    0        4     2     2     0     1     0     8    0
tcpcb      736      468    0      459    13     6     7     7     0     8    5
arp        136       30    0       14     1     0     1     1     0     8    0
inpcb      328     1519    0     1504    19     9    10    12     0     8    8
nd6        152       45    0       28     2     0     2     2     0     8    0
pkpcb       40        9    0        9     2     2     0     1     0     8    0
kcovpl      48       13    0        5     1     0     1     1     0     8    0
ppxss      1192      36    0       36     2     1     1     1     0     8    1
pfstscr     40       15    0       15     3     3     0     1     0     8    0
pffrag     232        7    0        2     1     0     1     1     0   482    0
pffrnode    88        7    0        2     1     0     1     1     0     8    0
pffrent     40       10    0        5     1     0     1     1     0     8    0
pfosfp      40     1428    0     1005     5     0     5     5     0     8    0
pfosfpen   112     1428    0      714    21     0    21    21     0     8    0
pfrktable  1344       1    0        1     1     1     0     1     0     8    0
pfanchor   1288       1    0        1     1     1     0     1     0     8    0
pftag       88        1    0        1     1     1     0     1     0     8    0
pfstitem    24       92    0       29     1     0     1     1     0     8    0
pfstkey    128      110    0       48     2     0     2     2     0     8    0
pfstate    448      104    0       42     7     0     7     7     0     8    0
pfrule     1344      25    0       20     2     1     1     2     0     8    0
rttmr      136        1    0        1     1     1     0     1     0     8    0
art_heap8  4096       4    0        1     3     0     3     3     0     8    0
art_heap4  256      818    0      495    31     7    24    29     0     8    2
art_table   40      822    0      496     5     0     5     5     0     8    0
art_node    32      191    0      120     1     0     1     1     0     8    0
sysvmsgpl   40       10    0        6     1     0     1     1     0     8    0
semupl     112        2    0        2     2     1     1     1     0     8    1
semapl     112       52    0       42     1     0     1     1     0     8    0
shmpl      112      128    0        4     4     0     4     4     0     8    0
dirhash    1024      23    0        6     3     0     3     3     0     8    0
dino2pl    256     3782    0     2266    96     0    96    96     0     8    0
ffsino     296     3782    0     2266   118     0   118   118     0     8    0
nchpl      144     5532    0     3830    64     0    64    64     0     8    0
rtmask      32       13    0       13     2     2     0     1     0     8    0
vnodes     216     4914    0        0   273     0   273   273     0     8    0
namei      1024   19949    0    19949     2     1     1     2     0     8    1
percpumem   16       97    0       49     1     0     1     1     0     8    0
vcpupl     3968       4    0        1     1     0     1     1     0     8    0
vmpool     840        4    0        1     1     0     1     1     0     8    0
kstatmem   264       96    0       70     3     0     3     3     0     8    1
scsiplug    72        5    0        5     3     2     1     1     0     8    1
scxspl     216    23865    0    23865    14    11     3     8     1     8    3
plimitpl   152      467    0      446     1     0     1     1     0     8    0
sigapl     424     1602    0     1554     7     1     6     7     0     8    0
knotepl    120      562    0        0    17     0    17    17     0     8    0
kqueuepl   224      481    0      468     8     5     3     5     0     8    2
pipepl     344      389    0      361    12     5     7     9     0     8    4
fdescpl    528     1585    0     1554     3     0     3     3     0     8    0
filepl     160    11075    0    10840    28     7    21    21     0     8    7
lockfpl    104      677    0      668     3     2     1     2     0     8    0
lockfspl    48      294    0      286     1     0     1     1     0     8    0
sessionpl  144       31    0       22     1     0     1     1     0     8    0
pgrppl      48       64    0       47     1     0     1     1     0     8    0
ucredpl    104     1667    0     1654     1     0     1     1     0     8    0
zombiepl   144     1556    0     1554     1     0     1     1     0     8    0
processpl  1232    1602    0     1554     5     0     5     5     0     8    0
procpl     664     3553    0     3496     6     0     6     6     0     8    0
sosppl     176       10    0       10     3     2     1     1     0     8    1
sockpl     752     2817    0     2780    39    25    14    18     0     8    8
mcl64k     65536     18    0        0     3     0     3     3     0     8    0
mcl16k     16384      3    0        0     1     0     1     1     0     8    0
mcl12k     12288      3    0        0     1     0     1     1     0     8    0
mcl8k      8192       3    0        0     1     0     1     1     0     8    0
mcl4k      4096     121    0        0    16     0    16    16     0     8    0
mcl2k2     2112       3    0        0     1     0     1     1     0     8    0
mcl2k      2048      43    0        0     5     0     5     5     0     8    0
mtagpl      96       41    0        0     1     0     1     1     0     8    0
mbufpl     256      252    0        0    16     0    16    16     0     8    0
bufpl      280     8372    0     2236   439     0   439   439     0     8    0
anonpl      32     8251    0        0    67     0    67    67     0   246    0
amapchunkpl 152   45829    0    45325    34     6    28    32     0   158    4
amappl16   200     4404    0     4368    26    14    12    16     0     8    5
amappl15   192       12    0       12     1     1     0     1     0     8    0
amappl14   184        3    0        3     1     1     0     1     0     8    0
amappl13   176      540    0      538     1     0     1     1     0     8    0
amappl12   168     1989    0     1946     3     0     3     3     0     8    0
amappl11   160       19    0       19     1     1     0     1     0     8    0
amappl10   152       53    0       39     1     0     1     1     0     8    0
amappl9    144      256    0      256     1     1     0     1     0     8    0
amappl8    136      125    0      123     1     0     1     1     0     8    0
amappl7    128      126    0      124     1     0     1     1     0     8    0
amappl6    120      336    0      323     1     0     1     1     0     8    0
amappl5    112      103    0       92     1     0     1     1     0     8    0
amappl4    104      469    0      436     1     0     1     1     0     8    0
amappl3     96     7944    0     7848     4     1     3     3     0     8    0
amappl2     88     1714    0     1635     2     0     2     2     0     8    0
amappl1     80    15364    0    14768    18     3    15    15     0     8    0
amappl      88    12639    0    12468     5     0     5     5     0    92    0
uvmvnodes   80      131    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        7    0        7     2     2     0     1     0     8    0
dma128     128      255    0      255     3     3     0     1     0     8    0
dma64       64        8    0        8     3     3     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      134    0        5     3     0     3     3     0     8    0
uaddrrnd    24     1585    0     1554     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24     1585    0     1554     1     0     1     1     0     8    0
vmmpekpl   168    14622    0    14581     3     0     3     3     0     8    0
vmmpepl    168   106840    0   104847   105     9    96    99     0   357    3
vmsppl     488     1584    0     1553     6     1     5     5     0     8    0
rwobjpl     80    29748    0    28549    29     0    29    29     0     8    0
pdppl      4096    3185    0     3111   118    42    76    85     0     8    2
pvpl        32    17298    0        0   139     0   139   139     0   265    0
pmappl     256     1588    0     1554     3     0     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      325    0       61     8     0     8     8     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at  x86_ipi_db+0x27:  addq  $0x8,%rsp
x86_ipi_db(ffffffff83867ff0) 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
end of kernel
end trace frame: 0x7c55129623c0, count: 12
ddb{0}> trace
x86_ipi_db(ffffffff83867ff0) 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
end of kernel
end trace frame: 0x7c55129623c0, count: -3
ddb{0}> machine ddbcpu 1
Stopped at  pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
pmap_page_remove(fffffd80085618a8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffffd80085618a8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014
uvm_anfree_list(fffffd80680f1e28,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112
amap_wipeout(fffffd806cc440c0) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80002a370410,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806caa5018) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
exit1(ffff8000313d9ca8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff8000313d9ca8,ffff80002a3705e0,ffff80002a370530) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a3705e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3705e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7166d260d4b0, count: 6
ddb{1}> trace
pmap_page_remove(fffffd80085618a8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffffd80085618a8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014
uvm_anfree_list(fffffd80680f1e28,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112
amap_wipeout(fffffd806cc440c0) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80002a370410,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806caa5018) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
exit1(ffff8000313d9ca8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff8000313d9ca8,ffff80002a3705e0,ffff80002a370530) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a3705e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3705e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7166d260d4b0, count: -9

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/24 05:53 openbsd 879ea5f6fdb7 4fb8ef37 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: pmap_page_remove
2025/11/14 06:05 openbsd 83ff66b05700 07e030de .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: pmap_page_remove
2025/11/11 16:24 openbsd 05de582f27ae 4e1406b4 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: pmap_page_remove
* Struck through repros no longer work on HEAD.