kernel: protection fault trap, code=NUM (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 259734c7096b The timeout in ospf6d regress seems to be too..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13f0ae72f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=994bdaaab8af55601814

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+994bda...@syzkaller.appspotmail.com

exclusive kernel: protection fault trap, code=0
Faulted in DDB; continuing...
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10185 6487K 6876K 78643K 16747 0
pcb 13 14K 17K 78643K 2379 0
rtable 226 7K 9K 78643K 584 0
ifaddr 85 18K 19K 78643K 227 0
sysctl 2 0K 0K 78643K 2 0
counters 56 35K 35K 78643K 102 0
ioctlops 0 0K 4K 78643K 2462 0
iov 0 0K 16K 78643K 161 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1336 83K 84K 78643K 3005 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 13K 78643K 169 0
VM map 2 1K 1K 78643K 2 0
sem 12 1K 1K 78643K 20 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 14 49K 93K 78643K 5437 0
sigio 0 0K 0K 78643K 14 0
proc 70 91K 128K 78643K 677 0
subproc 104 6K 6K 78643K 144 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 46 0
in_multi 91 6K 7K 78643K 171 0
ether_multi 1 0K 0K 78643K 7 0
mrt 0 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 73 334K 334K 78643K 73 0
exec 0 0K 2K 78643K 831 0
tdb 3 0K 0K 78643K 3 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 276 197K 215K 78643K 30495 0
UVM aobj 131 4K 4K 78643K 141 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 43 0
NDP 12 0K 2K 78643K 61 0
temp 129 4730K 4796K 78643K 22990 0
kqueue 12 18K 26K 78643K 307 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> 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 120 128 0 125 2 1 1 2 0 8 0
rtentry 112 166 0 62 4 0 4 4 0 8 0
unpcb 136 1527 0 1512 13 12 1 6 0 8 0
syncache 296 10 0 10 3 3 0 1 0 8 0
tcpqe 32 101 0 101 3 3 0 1 0 8 0
tcpcb 736 2654 0 2649 67 63 4 21 0 8 3
arp 120 24 0 6 1 0 1 1 0 8 0
inpcb 312 5617 0 5610 49 45 4 12 0 8 3
nd6 48 39 0 18 1 0 1 1 0 8 0
pkpcb 40 1 0 1 1 1 0 1 0 8 0
kcovpl 48 11 0 3 1 0 1 1 0 8 0
ppxss 1248 7 0 7 2 2 0 1 0 8 0
pfstscr 40 1 0 1 1 1 0 1 0 8 0
pffrag 232 7 0 7 2 2 0 1 0 482 0
pffrnode 88 7 0 7 2 2 0 1 0 8 0
pffrent 40 18 0 18 2 2 0 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 21 0 21 1 1 0 1 0 8 0
pftag 88 3 0 2 1 0 1 1 0 8 0
pfstitem 24 21 0 19 1 0 1 1 0 8 0
pfstkey 112 23 0 21 1 0 1 1 0 8 0
pfstate 336 22 0 20 2 1 1 2 0 8 0
pfrule 1360 41 0 40 2 1 1 2 0 8 0
rttmrq 48 9 0 5 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 726 0 301 30 2 28 29 0 8 0
art_table 32 727 0 301 4 0 4 4 0 8 0
art_node 16 165 0 70 1 0 1 1 0 8 0
sysvmsgpl 40 47 0 39 2 1 1 1 0 8 0
semupl 112 7 0 7 1 1 0 1 0 8 0
semapl 112 10 0 0 1 0 1 1 0 8 0
shmpl 112 138 0 10 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 8598 0 7160 91 0 91 91 0 8 0
ffsino 272 8598 0 7160 97 0 97 97 0 8 0
nchpl 144 15062 0 13417 63 0 63 63 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 43567 0 43566 2 1 1 2 0 8 0
percpumem 16 63 0 23 1 0 1 1 0 8 0
vcpupl 2048 40 0 2 5 0 5 5 0 8 0
vmpool 560 40 0 2 3 0 3 3 0 8 0
pfiaddrpl 120 7 0 7 1 1 0 1 0 8 0
kstatmem 264 70 0 46 2 0 2 2 0 8 0
scxspl 216 45417 0 45416 11 10 1 8 0 8 0
plimitpl 152 152 0 137 1 0 1 1 0 8 0
sigapl 424 5736 0 5692 6 0 6 6 0 8 0
futexpl 64 32788 0 32786 1 0 1 1 0 8 0
knotepl 120 354 0 0 8 0 8 8 0 8 0
kqueuepl 216 398 0 390 1 0 1 1 0 8 0
pipepl 336 456 0 428 14 11 3 8 0 8 0
fdescpl 496 5721 0 5694 5 0 5 5 0 8 0
filepl 152 21843 0 21602 38 27 11 18 0 8 1
lockfpl 104 377 0 375 2 1 1 2 0 8 0
lockfspl 48 111 0 109 1 0 1 1 0 8 0
sessionpl 144 27 0 10 1 0 1 1 0 8 0
pgrppl 48 31 0 14 1 0 1 1 0 8 0
ucredpl 96 1640 0 1628 1 0 1 1 0 8 0
zombiepl 144 5694 0 5692 1 0 1 1 0 8 0
processpl 1064 5736 0 5692 4 0 4 4 0 8 0
procpl 672 13580 0 13525 8 2 6 7 0 8 0
sosppl 168 33 0 33 5 5 0 1 0 8 0
sockpl 480 7340 0 7315 85 77 8 23 0 8 4
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 8 0 0 1 0 1 1 0 8 0
mcl12k 12288 10 0 0 1 0 1 1 0 8 0
mcl9k 9216 9 0 0 1 0 1 1 0 8 0
mcl8k 8192 17 0 0 3 0 3 3 0 8 0
mcl4k 4096 17 0 0 3 0 3 3 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 160 0 0 19 0 19 19 0 8 0
mtagpl 96 401 0 0 10 0 10 10 0 8 0
mbufpl 256 3925 0 0 244 0 244 244 0 8 0
bufpl 288 10070 0 3737 453 0 453 453 0 8 0
anonpl 24 965304 0 950671 140 30 110 128 0 186 0
amapchunkpl 152 87059 0 86420 47 14 33 36 0 158 1
amappl16 200 11146 0 10604 37 7 30 30 0 8 0
amappl15 192 1372 0 1369 1 0 1 1 0 8 0
amappl14 184 104 0 101 1 0 1 1 0 8 0
amappl13 176 649 0 646 1 0 1 1 0 8 0
amappl12 168 665 0 661 2 1 1 1 0 8 0
amappl11 160 1458 0 1436 2 0 2 2 0 8 1
amappl10 152 84 0 79 1 0 1 1 0 8 0
amappl9 144 1162 0 1158 1 0 1 1 0 8 0
amappl8 136 1357 0 1287 3 0 3 3 0 8 0
amappl7 128 784 0 770 1 0 1 1 0 8 0
amappl6 120 902 0 885 2 1 1 2 0 8 0
amappl5 112 2831 0 2815 1 0 1 1 0 8 0
amappl4 104 3710 0 3683 2 0 2 2 0 8 0
amappl3 96 16779 0 16733 2 0 2 2 0 8 0
amappl2 88 7327 0 7260 3 1 2 3 0 8 0
amappl1 80 133573 0 132966 21 6 15 20 0 8 0
amappl 88 29947 0 29773 6 1 5 5 0 92 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 128 253 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 72 140 0 10 3 0 3 3 0 8 0
uaddrrnd 24 5761 0 5695 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 5761 0 5695 1 0 1 1 0 8 0
vmmpekpl 168 36366 0 36314 3 0 3 3 0 8 0
vmmpepl 168 534846 0 532343 156 30 126 140 0 357 5
vmsppl 368 5760 0 5695 8 1 7 7 0 8 0
rwobjpl 56 128939 0 121333 110 1 109 109 0 8 0
pdppl 4096 11529 0 11428 218 111 107 109 0 8 6
pvpl 32 2010149 0 1991306 305 101 204 244 0 265 22
pmappl 248 5760 0 5695 5 0 5 5 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 1318 0 238 32 0 32 32 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff82960ff0) 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
x86_bus_space_io_write_1(3f8,0,75) at x86_bus_space_io_write_1+0x31 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,75) at comcnputc+0x128 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,75) at comcnputc+0x128 sys/dev/ic/com.c:1263
cnputc(75) at cnputc+0x4b sys/dev/cons.c:239
db_putchar(75) at db_putchar+0x3fc sys/ddb/db_output.c:155
kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068
db_printf(ffffffff82613d0b) at db_printf+0x85 sys/kern/subr_prf.c:502
panic(ffffffff8259a4b4) at panic+0xd7 sys/kern/subr_prf.c:220
__assert(ffffffff8260cacb,ffffffff82582f8f,90,ffffffff8256bbbb) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_pagealloc_pg(fffffd8007306940,fffffd80671dc9e8,3c7bca000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline]
uvm_pagealloc_pg(fffffd8007306940,fffffd80671dc9e8,3c7bca000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:710
uvm_pagealloc(fffffd80671dc9e8,3c7bca000,0,3) at uvm_pagealloc+0x1e8 sys/uvm/uvm_page.c:918
pmap_get_ptp(fffffd80671dc9b8,78f7959f000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1183
end trace frame: 0xffff80002e35b2c0, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff82960ff0) 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
x86_bus_space_io_write_1(3f8,0,75) at x86_bus_space_io_write_1+0x31 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,75) at comcnputc+0x128 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,75) at comcnputc+0x128 sys/dev/ic/com.c:1263
cnputc(75) at cnputc+0x4b sys/dev/cons.c:239
db_putchar(75) at db_putchar+0x3fc sys/ddb/db_output.c:155
kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068
db_printf(ffffffff82613d0b) at db_printf+0x85 sys/kern/subr_prf.c:502
panic(ffffffff8259a4b4) at panic+0xd7 sys/kern/subr_prf.c:220
__assert(ffffffff8260cacb,ffffffff82582f8f,90,ffffffff8256bbbb) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_pagealloc_pg(fffffd8007306940,fffffd80671dc9e8,3c7bca000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline]
uvm_pagealloc_pg(fffffd8007306940,fffffd80671dc9e8,3c7bca000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:710
uvm_pagealloc(fffffd80671dc9e8,3c7bca000,0,3) at uvm_pagealloc+0x1e8 sys/uvm/uvm_page.c:918
pmap_get_ptp(fffffd80671dc9b8,78f7959f000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1183
pmap_enter(fffffd80671dc9b8,78f7959f000,6584d000,3,22) at pmap_enter+0x2ac
uvm_fault_upper(ffff80002e35b460,ffff80002e35b498,ffff80002e35b360,0) at uvm_fault_upper+0x2b1 sys/uvm/uvm_fault.c:1047
uvm_fault(fffffd80688cc5c0,78f7959f000,0,2) at uvm_fault+0x164 sys/uvm/uvm_fault.c:610
upageflttrap(ffff80002e35b5d0,78f7959f2f8) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff80002e35b5d0) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7fffffb220, count: -20
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x18: addq $0x8,%rsp
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8259a4b4) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff8260cacb,ffffffff82614998,aae,ffffffff825c8d72) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_map_teardown(fffffd80688cc000) at uvm_map_teardown+0x2e8 sys/uvm/uvm_map.c:2736
uvmspace_free(fffffd80688cc000) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff8000210f9a40) at reaper+0x19a sys/kern/kern_exit.c:454
end trace frame: 0x0, count: 9
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8259a4b4) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff8260cacb,ffffffff82614998,aae,ffffffff825c8d72) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_map_teardown(fffffd80688cc000) at uvm_map_teardown+0x2e8 sys/uvm/uvm_map.c:2736
uvmspace_free(fffffd80688cc000) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff8000210f9a40) at reaper+0x19a sys/kern/kern_exit.c:454
end trace frame: 0x0, count: -6


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