syzbot


assert "_kernel_lock_held()" failed in uvm_device.c

Status: fixed on 2021/09/07 20:47
Reported-by: syzbot+5066429ecc0d98db5a30@syzkaller.appspotmail.com
Fix commit: 8e114673a836 vmm(4): grab kernel lock before vmspace init
First crash: 452d, last: 451d

Sample crash report:
panic: kernel diagnostic assertion "_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_device.c", line 230
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 192231  75679      0           0          0    1  syz-executor.0
*505203  92961      0           0  0x4000000    0  syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824526a8) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c05ca,ffffffff8244b560,e6,ffffffff824ced3e) at __assert+0x25 sys/kern/subr_prf.c:161
udv_reference(ffff800000b52480) at udv_reference+0x84 sys/uvm/uvm_device.c:230
uvm_mapent_clone(fffffd8008586730,0,3000,0,7,7) at uvm_mapent_clone+0x1a2 sys/uvm/uvm_map.c:3810
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c uvm_mapent_share sys/uvm/uvm_map.c:3840 [inline]
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c sys/uvm/uvm_map.c:3739
vm_impl_init_vmx(ffff800023293a40,ffff800021252540) at vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b57800,1,ffff800021252540) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806e154830,c5005601,ffff800000b57800,1,fffffd807f7d86c0,ffff800021252540) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd80645e5280,c5005601,ffff800000b57800,ffff800021252540) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021252540,ffff800023291538,ffff800023291580) at sys_ioctl+0x4a2
syscall(ffff800023291600) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800023291600) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x35472f3d600, count: 1
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{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: kernel diagnostic assertion "_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_device.c", line 230
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824526a8) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c05ca,ffffffff8244b560,e6,ffffffff824ced3e) at __assert+0x25 sys/kern/subr_prf.c:161
udv_reference(ffff800000b52480) at udv_reference+0x84 sys/uvm/uvm_device.c:230
uvm_mapent_clone(fffffd8008586730,0,3000,0,7,7) at uvm_mapent_clone+0x1a2 sys/uvm/uvm_map.c:3810
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c uvm_mapent_share sys/uvm/uvm_map.c:3840 [inline]
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c sys/uvm/uvm_map.c:3739
vm_impl_init_vmx(ffff800023293a40,ffff800021252540) at vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b57800,1,ffff800021252540) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806e154830,c5005601,ffff800000b57800,1,fffffd807f7d86c0,ffff800021252540) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd80645e5280,c5005601,ffff800000b57800,ffff800021252540) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021252540,ffff800023291538,ffff800023291580) at sys_ioctl+0x4a2
syscall(ffff800023291600) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800023291600) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x35472f3d600, count: -14
ddb{0}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800023290ea0
rbx               0xffffffff82828bff    cpu_info_full_primary+0x2bff
rdx                             0x8b
rcx                              0x2
rax                             0x8c
r8                0xffffffff820a9ca4    kprintf+0x144
r9                               0x1
r10               0xc1772241ca573511
r11               0xbf97a082c3efaf64
r12               0xffffffff82828a00    cpu_info_full_primary+0x2a00
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff8230ccb8    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800023290e90
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=505203 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=32, usrpri=86, nice=20
    forw=0xffffffffffffffff, list=0xffff8000212522a0,0xffff8000212527f0
    process=0xffff8000ffffae18 user=0xffff80002328c000, vmspace=0xfffffd806f035e68
    estcpu=36, cpticks=6, pctcpu=0.0
    user=0, sys=2, intr=0
ddb{0}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 75679  192231  53394      0  7           0                syz-executor.0
 75679  192092  53394      0  2   0x4000000                syz-executor.0
 92961   85714  36435      0  2           0                syz-executor.1
*92961  505203  36435      0  7   0x4000000                syz-executor.1
 36435  453157  13710      0  2       0x482                syz-executor.1
 53394  465636  13710      0  2       0x482                syz-executor.0
 13710  486600  38023      0  3        0x82  thrsleep      syz-fuzzer
 13710  505906  38023      0  2   0x4000482                syz-fuzzer
 13710  348493  38023      0  3   0x4000082  thrsleep      syz-fuzzer
 13710  300960  38023      0  3   0x4000082  thrsleep      syz-fuzzer
 13710  160694  38023      0  3   0x4000082  thrsleep      syz-fuzzer
 13710  414039  38023      0  3   0x4000082  thrsleep      syz-fuzzer
 13710  485736  38023      0  3   0x4000082  thrsleep      syz-fuzzer
 13710  514877  38023      0  3   0x4000082  kqread        syz-fuzzer
 38023  216163  15155      0  3    0x10008a  sigsusp       ksh
 15155   71207   8610      0  3        0x9a  select        sshd
 31193  521155      1      0  3    0x100083  ttyin         getty
  8610  208689      1      0  3        0x88  select        sshd
 71651  273758  64881     74  3    0x100092  bpf           pflogd
 64881  312229      1      0  3        0x80  netio         pflogd
 17629  345331  60661     73  3    0x100090  kqread        syslogd
 60661  462567      1      0  3    0x100082  netio         syslogd
 74182  522701      1      0  3    0x100080  kqread        resolvd
 98664  304609  22109     77  3    0x100092  kqread        dhcpleased
 54119  360830  22109     77  3    0x100092  kqread        dhcpleased
 22109  448930      1      0  3        0x80  kqread        dhcpleased
 78801  515149      0      0  3     0x14200  bored         smr
 77706  204608      0      0  2     0x14200                zerothread
 76585  474381      0      0  3     0x14200  aiodoned      aiodoned
 99809  146253      0      0  3     0x14200  syncer        update
 57919  106289      0      0  3     0x14200  cleaner       cleaner
 70758  187519      0      0  3     0x14200  reaper        reaper
 12900  458268      0      0  3     0x14200  pgdaemon      pagedaemon
 24502  199352      0      0  3     0x14200  bored         crynlk
 95810  100075      0      0  3     0x14200  bored         crypto
 84794  225045      0      0  3     0x14200  bored         viomb
 93805  416084      0      0  3  0x40014200  acpi0         acpi0
 90720   83800      0      0  3  0x40014200                idle1
 55617  350080      0      0  3     0x14200  bored         softnet
 46275  264796      0      0  3     0x14200  bored         systqmp
 68420  146462      0      0  3     0x14200  bored         systq
 91271   50830      0      0  3  0x40014200  bored         softclock
 37642  347058      0      0  3  0x40014200                idle0
     1   23560      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{0}> show all locks
Process 92961 (syz-executor.1) thread 0xffff800021252540 (505203)
shared rwlock vmmaplk r = 0 (0xfffffd806f035e80)
#0  witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0  witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1  uvm_share+0xd2 vm_map_lock_read_ln sys/uvm/uvm_map.c:5447 [inline]
#1  uvm_share+0xd2 sys/uvm/uvm_map.c:3691
#2  vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
#3  vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
#3  vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
#4  vmmioctl+0x1f2
#5  VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
#6  vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#7  sys_ioctl+0x4a2
#8  syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8  syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#9  Xsyscall+0x128
exclusive rwlock vmmaplk r = 0 (0xfffffd8008586748)
#0  witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0  witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1  rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2  vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5425
#3  uvm_share+0xaa vm_map_lock_read_ln sys/uvm/uvm_map.c:5446 [inline]
#3  uvm_share+0xaa sys/uvm/uvm_map.c:3691
#4  vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
#5  vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
#5  vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
#6  vmmioctl+0x1f2
#7  VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
#8  vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#9  sys_ioctl+0x4a2
#10 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#10 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#11 Xsyscall+0x128
exclusive rwlock vmlistlock r = 0 (0xffff800000655c78)
#0  witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0  witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1  vm_create+0x12e vm_impl_init sys/arch/amd64/amd64/vmm.c:1688 [inline]
#1  vm_create+0x12e sys/arch/amd64/amd64/vmm.c:1510
#2  vmmioctl+0x1f2
#3  VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
#4  vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#5  sys_ioctl+0x4a2
#6  syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6  syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#7  Xsyscall+0x128
ddb{0}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10118   6420K    6420K  78643K     11208        0
            pcb    13      8K       8K  78643K        13        0
         rtable   106      3K       3K  78643K       172        0
         ifaddr    44     10K      10K  78643K        45        0
       counters    44     34K      34K  78643K        44        0
       ioctlops     1      2K       4K  78643K      1483        0
          mount     1      1K       1K  78643K         1        0
            log     0      0K       0K  78643K         6        0
         vnodes  1216     76K      76K  78643K      1222        0
      UFS quota     1     32K      32K  78643K         1        0
      UFS mount     5     36K      36K  78643K         5        0
            shm     2      1K       1K  78643K         2        0
         VM map     2      1K       1K  78643K         2        0
            sem     2      0K       0K  78643K         2        0
        dirhash    12      2K       2K  78643K        12        0
           ACPI  1697    195K     286K  78643K     12598        0
      file desc     6     17K      25K  78643K        39        0
           proc    67     87K     111K  78643K       334        0
        subproc    32      2K       2K  78643K        34        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
       in_multi    33      2K       2K  78643K        33        0
    ether_multi     1      0K       0K  78643K         1        0
    ISOFS mount     1     32K      32K  78643K         1        0
  MSDOSFS mount     1     16K      16K  78643K         1        0
           ttys    25    122K     122K  78643K        25        0
           exec     0      0K       2K  78643K       404        0
        pagedep     1      8K       8K  78643K         1        0
       inodedep     1     32K      32K  78643K         1        0
         newblk     1      0K       0K  78643K         1        0
        VM swap     7     26K      26K  78643K         7        0
       UVM amap   233     43K      43K  78643K      2145        0
       UVM aobj     3      2K       2K  78643K         3        0
        memdesc     1      4K       4K  78643K         1        0
    crypto data     1      1K       1K  78643K         1        0
            NDP    10      0K       0K  78643K        10        0
           temp    65   4195K    4259K  78643K      2358        0
         kqueue    10     14K      14K  78643K        10        0
      SYN cache     2     16K      16K  78643K         2        0
ddb{0}> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache    128       22    0        0     1     0     1     1     0     8    0
rtpcb      120       21    0       18     1     0     1     1     0     8    0
rtentry    112       45    0        1     2     0     2     2     0     8    0
unpcb      120       36    0       20     1     0     1     1     0     8    0
syncache   296        4    0        4     1     1     0     1     0     8    0
tcpqe       32     2119    0     2119     1     0     1     1     0     8    1
tcpcb      736       10    0        6     1     0     1     1     0     8    0
arp        120        6    0        0     1     0     1     1     0     8    0
inpcb      304       42    0       35     1     0     1     1     0     8    0
nd6         48        6    0        0     1     0     1     1     0     8    0
kcovpl      48        2    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       12    0        1     1     0     1     1     0     8    0
pfstkey    112       12    0        1     1     0     1     1     0     8    0
pfstate    320       12    0        1     1     0     1     1     0     8    0
pfrule     1360      21    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      188    0        0    12     0    12    12     0     8    0
art_table   32      189    0        0     2     0     2     2     0     8    0
art_node    16       44    0        4     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1443    0       32    89     0    89    89     0     8    0
ffsino     272     1443    0       32    95     0    95    95     0     8    0
nchpl      144     1677    0       57    61     0    61    61     0     8    0
uvmvnodes   72     1487    0        0    28     0    28    28     0     8    0
vnodes     224     1487    0        0    88     0    88    88     0     8    0
namei      1024    4695    0     4695     2     1     1     1     0     8    1
percpumem   16       34    0        0     1     0     1     1     0     8    0
vcpupl     2048       1    0        0     1     0     1     1     0     8    0
vmpool     560        2    0        0     1     0     1     1     0     8    0
scxspl     216     4964    0     4964    10     2     8     8     0     8    8
plimitpl   152       17    0        8     1     0     1     1     0     8    0
sigapl     424      289    0      254     5     0     5     5     0     8    1
futexpl     56       73    0       73     1     0     1     1     0     8    1
knotepl    112       58    0        0     2     0     2     2     0     8    0
kqueuepl   216       11    0        0     1     0     1     1     0     8    0
pipepl     336       83    0       72     1     0     1     1     0     8    0
fdescpl    496      273    0      254     3     0     3     3     0     8    0
filepl     152     1254    0     1129     5     0     5     5     0     8    0
lockfpl    104        9    0        7     1     0     1     1     0     8    0
lockfspl    48        5    0        3     1     0     1     1     0     8    0
sessionpl  144       18    0        7     1     0     1     1     0     8    0
pgrppl      48       18    0        7     1     0     1     1     0     8    0
ucredpl     96       63    0       51     1     0     1     1     0     8    0
zombiepl   144      254    0      254     2     1     1     1     0     8    1
processpl  1072     289    0      254     3     0     3     3     0     8    0
procpl     672      307    0      263     4     0     4     4     0     8    0
sockpl     480       99    0       73     4     0     4     4     0     8    0
mcl12k     12288      1    0        0     1     0     1     1     0     8    0
mcl8k      8192       5    0        0     1     0     1     1     0     8    0
mcl4k      4096       4    0        0     1     0     1     1     0     8    0
mcl2k      2048     268    0        0    33     0    33    33     0     8    0
mtagpl      96        3    0        0     1     0     1     1     0     8    0
mbufpl     256      310    0        0    19     0    19    19     0     8    0
bufpl      280     3436    0      136   236     0   236   236     0     8    0
anonpl      24    58192    0    36624   133     2   131   131     0   186    1
amapchunkpl 152    4540    0     3862    30     2    28    28     0   158    0
amappl16   200      947    0      139    43     0    43    43     0     8    0
amappl14   184        7    0        1     1     0     1     1     0     8    0
amappl13   176       30    0       28     1     0     1     1     0     8    0
amappl12   168       17    0       12     1     0     1     1     0     8    0
amappl11   160       47    0       33     1     0     1     1     0     8    0
amappl10   152       41    0       35     1     0     1     1     0     8    0
amappl9    144      243    0      238     1     0     1     1     0     8    0
amappl8    136      360    0      327     2     0     2     2     0     8    0
amappl7    128       71    0       57     1     0     1     1     0     8    0
amappl6    120      132    0      120     1     0     1     1     0     8    0
amappl5    112      173    0      154     1     0     1     1     0     8    0
amappl4    104      571    0      548     1     0     1     1     0     8    0
amappl3     96       53    0       45     1     0     1     1     0     8    0
amappl2     88      475    0      421     2     0     2     2     0     8    0
amappl1     80     7949    0     7496    15     4    11    13     0     8    1
amappl      88     1829    0     1653     5     0     5     5     0    92    1
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      64        2    0        0     1     0     1     1     0     8    0
uaddrrnd    24      275    0      254     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      275    0      254     1     0     1     1     0     8    0
vmmpekpl   168     6582    0     6551     2     0     2     2     0     8    0
vmmpepl    168    29334    0    27087   134     0   134   134     0   357   36
vmsppl     368      274    0      254     2     0     2     2     0     8    0
rwobjpl     56     8598    0     7010    24     0    24    24     0     8    1
pdppl      4096     558    0      509    70    20    50    50     0     8    1
pvpl        32   178822    0   153334   208     1   207   207     0   265    0
pmappl     224      274    0      254     2     0     2     2     0     8    0
extentpl    40       58    0       40     1     0     1     1     0     8    0
phpool     112      336    0       24     9     0     9     9     0     8    0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824526a8) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c05ca,ffffffff8244b560,e6,ffffffff824ced3e) at __assert+0x25 sys/kern/subr_prf.c:161
udv_reference(ffff800000b52480) at udv_reference+0x84 sys/uvm/uvm_device.c:230
uvm_mapent_clone(fffffd8008586730,0,3000,0,7,7) at uvm_mapent_clone+0x1a2 sys/uvm/uvm_map.c:3810
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c uvm_mapent_share sys/uvm/uvm_map.c:3840 [inline]
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c sys/uvm/uvm_map.c:3739
vm_impl_init_vmx(ffff800023293a40,ffff800021252540) at vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b57800,1,ffff800021252540) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806e154830,c5005601,ffff800000b57800,1,fffffd807f7d86c0,ffff800021252540) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd80645e5280,c5005601,ffff800000b57800,ffff800021252540) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021252540,ffff800023291538,ffff800023291580) at sys_ioctl+0x4a2
syscall(ffff800023291600) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800023291600) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x35472f3d600, count: -14
ddb{0}> machine ddbcpu 1
Stopped at      x86_ipi_db+0x1a:        addq    $0x8,%rsp
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
end of kernel
end trace frame: 0x7f7ffffd9c30, count: 12
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
end of kernel
end trace frame: 0x7f7ffffd9c30, count: -3

Crashes (7):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-openbsd-multicore 2021/09/02 07:02 openbsd e42df31d2641 7eb7e152 .config log report assert "_kernel_lock_held()" failed in uvm_device.c
ci-openbsd-multicore 2021/09/01 03:54 openbsd 444296aeff58 7eb7e152 .config log report assert "_kernel_lock_held()" failed in uvm_device.c
ci-openbsd-multicore 2021/09/01 03:52 openbsd 444296aeff58 7eb7e152 .config log report assert "_kernel_lock_held()" failed in uvm_device.c
ci-openbsd-multicore 2021/09/01 03:52 openbsd 444296aeff58 7eb7e152 .config log report assert "_kernel_lock_held()" failed in uvm_device.c
ci-openbsd-multicore 2021/09/01 03:51 openbsd 444296aeff58 7eb7e152 .config log report assert "_kernel_lock_held()" failed in uvm_device.c
ci-openbsd-multicore 2021/09/01 03:41 openbsd 444296aeff58 7eb7e152 .config log report assert "_kernel_lock_held()" failed in uvm_device.c
ci-openbsd-multicore 2021/09/01 03:39 openbsd 444296aeff58 7eb7e152 .config log report assert "_kernel_lock_held()" failed in uvm_device.c
* Struck through repros no longer work on HEAD.