kernel: privileged instruction fault trap, code=0

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syzbot

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Jan 16, 2020, 8:44:11 PM1/16/20
to syzkaller-o...@googlegroups.com
Hello,

syzbot found the following crash on:

HEAD commit: 70e79057 Link iked live test to build. To operate it need..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=147523b9e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=9dae454cfe7fea54463b

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9dae45...@syzkaller.appspotmail.com

login: kernel: privileged instruction fault trap, code=0
Stopped at vmptrld+0xb: rdrand 0(%rdi)
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
the kernel did not panic
ddb{0}> trace
vmptrld() at vmptrld+0xb
vm_create(ffff800000a61000,ffff800020aa0780) at vm_create+0x304 vcpu_init
sys/arch/amd64/amd64/vmm.c:3292 [inline]
vm_create(ffff800000a61000,ffff800020aa0780) at vm_create+0x304
sys/arch/amd64/amd64/vmm.c:1193
VOP_IOCTL(fffffd806e13bea0,c5005601,ffff800000a61000,1,fffffd807f7be900,ffff800020aa0780)
at
VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291
vn_ioctl(fffffd8066a970b8,c5005601,ffff800000a61000,ffff800020aa0780) at
vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533
sys_ioctl(ffff800020aa0780,ffff800023be0f58,ffff800023be0fa0) at
sys_ioctl+0x498
syscall(ffff800023be1020) at syscall+0x4a4 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800023be1020) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x97b846d1820, count: -7
ddb{0}> show registers
rdi 0xffff800023bcb1d0
rsi 0x1
rbp 0xffff800023be0c10
rbx 0xffff800023bcae80
rdx 0xf07
rcx 0x11e57ed0 __kernel_end_phys+0xf657ed0
rax 0xfffffd8065a34000
r8 0
r9 0
r10 0x4
r11 0x707049055b20b185
r12 0x1
r13 0
r14 0xffff800023bcae80
r15 0xffff800023bcb1d0
rip 0xffffffff81024c41 vmptrld+0xb
cs 0x8
rflags 0x10202 __ALIGN_SIZE+0xf202
rsp 0xffff800023be0bd8
ss 0x10
vmptrld+0xb: rdrand 0(%rdi)
ddb{0}> show proc
PROC (syz-executor.1) pid=242590 stat=onproc
flags process=1000<SINGLEEXIT> proc=4080000<SUSPSINGLE,THREAD>
pri=32, usrpri=62, nice=20
forw=0xffffffffffffffff, list=0xffff800020aa0290,0xffff800020aa0a08
process=0xffff800020af4380 user=0xffff800023bdc000,
vmspace=0xfffffd807f0005c0
estcpu=12, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
51853 238817 35936 0 2 0 syz-executor.0
51853 156658 35936 0 3 0x4000080 fsleep syz-executor.0
51853 145355 35936 0 3 0x4000080 fsleep syz-executor.0
77543 149440 82544 0 3 0x3000 suspend syz-executor.1
*77543 242590 82544 0 7 0x4081000 syz-executor.1
64094 369551 0 0 3 0x14200 acct acct
82544 232916 40125 0 3 0x82 nanosleep syz-executor.1
35936 95152 40125 0 3 0x82 nanosleep syz-executor.0
40125 131514 887 0 3 0x82 thrsleep syz-fuzzer
40125 50997 887 0 3 0x4000082 thrsleep syz-fuzzer
40125 388289 887 0 3 0x4000082 thrsleep syz-fuzzer
40125 468508 887 0 3 0x4000082 thrsleep syz-fuzzer
40125 169330 887 0 3 0x4000082 thrsleep syz-fuzzer
40125 442145 887 0 3 0x4000082 thrsleep syz-fuzzer
40125 342653 887 0 3 0x4000082 thrsleep syz-fuzzer
40125 360688 887 0 3 0x4000082 thrsleep syz-fuzzer
40125 493347 887 0 3 0x4000082 kqread syz-fuzzer
40125 332138 887 0 3 0x4000082 thrsleep syz-fuzzer
887 65795 70521 0 3 0x10008a pause ksh
70521 521673 26381 0 3 0x92 select sshd
98274 167333 1 0 3 0x100083 ttyin getty
26381 314602 1 0 3 0x80 select sshd
78464 65479 85135 74 3 0x100092 bpf pflogd
85135 213497 1 0 3 0x80 netio pflogd
78345 380889 64496 73 3 0x100090 kqread syslogd
64496 394297 1 0 3 0x100082 netio syslogd
50752 68937 1 77 3 0x100090 poll dhclient
74025 399931 1 0 3 0x80 poll dhclient
82585 377088 0 0 2 0x14200 zerothread
56656 174629 0 0 3 0x14200 aiodoned aiodoned
92759 508307 0 0 3 0x14200 syncer update
74226 498576 0 0 3 0x14200 cleaner cleaner
16784 176284 0 0 7 0x14200 reaper
56987 360756 0 0 3 0x14200 pgdaemon pagedaemon
50215 307249 0 0 3 0x14200 bored crynlk
88373 37621 0 0 3 0x14200 bored crypto
67843 59246 0 0 3 0x40014200 acpi0 acpi0
66061 416568 0 0 3 0x40014200 idle1
43298 438775 0 0 3 0x14200 bored softnet
60302 14949 0 0 3 0x14200 bored systqmp
4238 142678 0 0 3 0x14200 bored systq
45410 401178 0 0 3 0x40014200 bored softclock
6082 137982 0 0 3 0x40014200 idle0
88329 457037 0 0 3 0x14200 bored smr
1 480651 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 77543 (syz-executor.1) thread 0xffff800020aa0780 (242590)
exclusive rwlock vmlistlock r = 0 (0xffff800000678878)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 vm_create+0x130 vm_impl_init sys/arch/amd64/amd64/vmm.c:1353 [inline]
#2 vm_create+0x130 sys/arch/amd64/amd64/vmm.c:1174
#3 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291
#4 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533
#5 sys_ioctl+0x498
#6 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#6 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#7 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82626628)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227
#2 mi_switch+0x392 sys/kern/sched_bsd.c:434
#3 sleep_finish+0x113 sys/kern/kern_synch.c:405
#4 rw_enter+0x3d6 sys/kern/kern_rwlock.c:285
#5 vm_create+0x130 vm_impl_init sys/arch/amd64/amd64/vmm.c:1353 [inline]
#5 vm_create+0x130 sys/arch/amd64/amd64/vmm.c:1174
#6 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291
#7 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533
#8 sys_ioctl+0x498
#9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#10 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9473 6398K 6850K 78643K 10698 0
pcb 16 8K 8K 78643K 49 0
rtable 116 4K 4K 78643K 246 0
ifaddr 47 11K 12K 78643K 63 0
counters 39 33K 33K 78643K 39 0
ioctlops 1 2K 4K 78643K 1471 0
iov 0 0K 16K 78643K 6 0
mount 1 1K 1K 78643K 1 0
vnodes 1218 77K 77K 78643K 1274 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 6 0K 0K 78643K 8 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 6 17K 25K 78643K 80 0
sigio 0 0K 0K 78643K 9 0
proc 59 63K 95K 78643K 454 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 40 2K 2K 78643K 40 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 43 201K 201K 78643K 43 0
exec 0 0K 1K 78643K 213 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 110 37K 37K 78643K 1182 0
UVM aobj 2 2K 2K 78643K 2 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 2 0
NDP 6 0K 0K 78643K 13 0
temp 86 3012K 3076K 78643K 3632 0
kqueue 3 4K 12K 78643K 7 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
arp 64 7 0 0 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 25 0 23 1 0 1 1 0
8 0
rtentry 112 51 0 3 2 0 2 2 0
8 0
unpcb 120 65 0 55 1 0 1 1 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpqe 32 56 0 56 1 0 1 1 0
8 1
tcpcb 544 33 0 29 1 0 1 1 0
8 0
inpcb 280 98 0 88 1 0 1 1 0
8 0
nd6 48 4 0 0 1 0 1 1 0
8 0
pkpcb 40 2 0 2 1 0 1 1 0
8 1
ppxss 1128 1 0 1 1 0 1 1 0
8 1
pfosfp 40 846 0 423 5 0 5 5 0
8 0
pfosfpen 112 1428 0 714 21 0 21 21 0
8 0
pfstitem 24 14 0 1 1 0 1 1 0
8 0
pfstkey 112 14 0 1 1 0 1 1 0
8 0
pfstate 328 14 0 0 2 0 2 2 0
8 0
pfrule 1360 21 0 16 2 1 1 2 0
8 0
art_heap8 4096 2 0 0 2 0 2 2 0
8 0
art_heap4 256 234 0 5 15 0 15 15 0
8 0
art_table 32 236 0 5 2 0 2 2 0
8 0
art_node 16 50 0 6 1 0 1 1 0
8 0
sysvmsgpl 40 51 0 27 1 0 1 1 0
8 0
semupl 112 1 0 1 1 0 1 1 0
8 1
semapl 112 4 0 0 1 0 1 1 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 1507 0 99 46 0 46 46 0
8 0
ffsino 272 1507 0 99 95 0 95 95 0
8 0
nchpl 144 1794 0 175 61 0 61 61 0
8 0
uvmvnodes 72 1587 0 0 29 0 29 29 0
8 0
vnodes 208 1587 0 0 84 0 84 84 0
8 0
namei 1024 4851 0 4851 1 0 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
vcpupl 1984 2 0 1 1 0 1 1 0
8 0
vmpool 560 2 0 1 1 0 1 1 0
8 0
scxspl 192 4814 0 4814 2 1 1 2 0
8 1
plimitpl 152 19 0 11 1 0 1 1 0
8 0
sigapl 432 279 0 263 3 0 3 3 0
8 1
futexpl 56 1036 0 1034 1 0 1 1 0
8 0
knotepl 112 57 0 38 1 0 1 1 0
8 0
kqueuepl 104 14 0 12 1 0 1 1 0
8 0
pipelkpl 48 84 0 74 1 0 1 1 0
8 0
pipepl 120 168 0 149 1 0 1 1 0
8 0
fdescpl 496 280 0 263 3 0 3 3 0
8 0
filepl 152 1640 0 1531 7 1 6 6 0
8 1
lockfpl 104 11 0 8 1 0 1 1 0
8 0
lockfspl 48 5 0 3 1 0 1 1 0
8 0
sessionpl 112 18 0 7 1 0 1 1 0
8 0
pgrppl 48 18 0 7 1 0 1 1 0
8 0
ucredpl 96 185 0 176 1 0 1 1 0
8 0
zombiepl 144 264 0 263 1 0 1 1 0
8 0
processpl 896 296 0 263 4 0 4 4 0
8 0
procpl 632 422 0 376 5 0 5 5 0
8 1
sockpl 400 190 0 168 4 0 4 4 0
8 1
mcl64k 65536 2 0 0 1 0 1 1 0
8 0
mcl16k 16384 3 0 0 1 0 1 1 0
8 0
mcl12k 12288 2 0 0 1 0 1 1 0
8 0
mcl9k 9216 1 0 0 1 0 1 1 0
8 0
mcl8k 8192 5 0 0 1 0 1 1 0
8 0
mcl4k 4096 2 0 0 1 0 1 1 0
8 0
mcl2k 2048 155 0 0 19 0 19 19 0
8 0
mtagpl 80 8 0 0 1 0 1 1 0
8 0
mbufpl 256 222 0 0 14 0 14 14 0
8 0
bufpl 280 6318 0 1340 356 0 356 356 0
8 0
anonpl 16 44168 0 29376 77 1 76 76 0 125
16
amapchunkpl 152 1326 0 1187 8 0 8 8 0
158 2
amappl16 192 1260 0 468 52 4 48 52 0
8 8
amappl15 184 111 0 102 1 0 1 1 0
8 0
amappl14 176 30 0 28 1 0 1 1 0
8 0
amappl13 168 1 0 1 1 1 0 1 0
8 0
amappl12 160 4 0 4 1 1 0 1 0
8 0
amappl11 152 53 0 38 1 0 1 1 0
8 0
amappl10 144 36 0 31 1 0 1 1 0
8 0
amappl9 136 603 0 599 1 0 1 1 0
8 0
amappl8 128 119 0 96 1 0 1 1 0
8 0
amappl7 120 131 0 119 1 0 1 1 0
8 0
amappl6 112 58 0 49 1 0 1 1 0
8 0
amappl5 104 136 0 122 1 0 1 1 0
8 0
amappl4 96 539 0 502 2 1 1 2 0
8 0
amappl3 88 122 0 115 1 0 1 1 0
8 0
amappl2 80 1359 0 1271 3 1 2 3 0
8 0
amappl1 72 16248 0 15764 26 15 11 21 0
8 1
amappl 80 670 0 622 2 0 2 2 0
84 0
dma4096 4096 1 0 1 1 1 0 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 1 0 0 1 0 1 1 0
8 0
uaddrrnd 24 282 0 264 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 282 0 264 1 0 1 1 0
8 0
vmmpekpl 168 6111 0 6077 2 0 2 2 0
8 0
vmmpepl 168 41872 0 39771 116 5 111 111 0 357
19
vmsppl 368 281 0 264 2 0 2 2 0
8 0
pdppl 4096 571 0 529 6 0 6 6 0
8 0
pvpl 32 145410 0 127256 184 1 183 183 0 265
36
pmappl 232 281 0 264 2 0 2 2 0
8 0
extentpl 40 46 0 29 1 0 1 1 0
8 0
phpool 112 170 0 3 5 0 5 5 0
8 0


---
This bug is generated by a bot. It may contain errors.
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syzbot

unread,
Apr 15, 2020, 9:44:13 PM4/15/20
to syzkaller-o...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
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