uvm_fault: x86_ipi_db (5)

0 views
Skip to first unread message

syzbot

unread,
Aug 22, 2021, 3:13:30 AMAug 22
to syzkaller-o...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: bee784fa9ac3 Preserve argument type in command and convert..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=111d9b65300000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=6a52b192b1d4d094a246

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+6a52b1...@syzkaller.appspotmail.com

uvm_fault(fffffd806ee78e68,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff8000242b3340,20000080) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff8000242b3340) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff8000242b3570) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000242b3570) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbcd2eb07a00, count: -15
ddb{0}> show registers
rdi 0xffff80002349c000
rsi 0x3969 __ALIGN_SIZE+0x2969
rbp 0xffff8000242b2cc0
rbx 0x3
rdx 0xffff80002349c000
rcx 0x3968 __ALIGN_SIZE+0x2968
rax 0xffffffff8150d207 db_enter+0x17
r8 0xffffffff81c323dc witness_checkorder+0x10cc
r9 0x5
r10 0xdfea5deb9b99da47
r11 0x164442da07d6c6f9
r12 0xfffffd8002da87c0
r13 0
r14 0
r15 0
rip 0xffffffff8150d208 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000242b2cb0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=313654 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=78, nice=20
forw=0xffffffffffffffff, list=0xffff800021272540,0xffffffff828e52d0
process=0xffff8000ffffa5b8 user=0xffff8000242ae000, vmspace=0xfffffd806ee78e68
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
51073 408758 71589 0 2 0 syz-executor.1
*51073 313654 71589 0 7 0x4000000 syz-executor.1
51870 270575 0 0 3 0x14200 bored sosplice
71589 73654 1255 0 3 0x82 nanoslp syz-executor.1
75293 481970 1255 0 3 0x2 biowait syz-executor.0
1255 505622 1883 0 3 0x82 thrsleep syz-fuzzer
1255 169106 1883 0 3 0x4000082 nanoslp syz-fuzzer
1255 303854 1883 0 3 0x4000082 thrsleep syz-fuzzer
1255 492637 1883 0 3 0x4000082 thrsleep syz-fuzzer
1255 149542 1883 0 3 0x4000082 thrsleep syz-fuzzer
1255 477002 1883 0 3 0x4000082 kqread syz-fuzzer
1255 446993 1883 0 3 0x4000082 thrsleep syz-fuzzer
1255 497865 1883 0 3 0x4000082 nanoslp syz-fuzzer
1883 360730 17356 0 3 0x10008a sigsusp ksh
17356 173433 69534 0 3 0x9a select sshd
94725 347449 1 0 3 0x100083 ttyin getty
69534 248507 1 0 3 0x88 select sshd
33626 377757 3986 74 3 0x100092 bpf pflogd
3986 158376 1 0 3 0x80 netio pflogd
99957 11453 32636 73 3 0x100090 kqread syslogd
32636 495452 1 0 3 0x100082 netio syslogd
31399 175198 1 0 3 0x100080 kqread resolvd
17375 71594 58608 77 3 0x100092 kqread dhcpleased
7444 226281 58608 77 3 0x100092 kqread dhcpleased
58608 284362 1 0 3 0x80 kqread dhcpleased
33880 468288 0 0 3 0x14200 bored smr
24943 114459 0 0 2 0x14200 zerothread
67501 154135 0 0 3 0x14200 aiodoned aiodoned
84420 253888 0 0 3 0x14200 syncer update
34939 411108 0 0 3 0x14200 cleaner cleaner
18923 419300 0 0 3 0x14200 reaper reaper
29371 138234 0 0 3 0x14200 pgdaemon pagedaemon
54922 365275 0 0 3 0x14200 bored crynlk
5537 5154 0 0 3 0x14200 bored crypto
46442 388737 0 0 3 0x14200 bored viomb
94962 60168 0 0 3 0x40014200 acpi0 acpi0
29912 26595 0 0 7 0x40014200 idle1
98587 349276 0 0 3 0x14200 bored softnet
85785 183723 0 0 3 0x14200 bored systqmp
60776 99782 0 0 3 0x14200 bored systq
24704 131097 0 0 3 0x40014200 bored softclock
57988 503732 0 0 3 0x40014200 idle0
1 37480 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 51073 (syz-executor.1) thread 0xffff8000212737a0 (313654)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829dbb18)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 uvm_fault+0x224 sys/uvm/uvm_fault.c:637
#2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
#3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
#4 alltraps_kern_meltdown+0x7b
#5 copyout+0x53
#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
exclusive rwlock fdlock r = 0 (0xfffffd806f0d0a10)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 sys_socketpair+0x20f
#2 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#2 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#3 Xsyscall+0x128
Process 75293 (syz-executor.0) thread 0xffff800021273500 (481970)
exclusive rrwlock inode r = 0 (0xfffffd8068e6d920)
#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 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140
#4 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1350
#5 ffs_inode_alloc+0x1c3 sys/ufs/ffs/ffs_alloc.c:394
#6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162
#7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457
#8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3070
#9 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#9 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#10 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806b050d58)
#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 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vfs_lookup+0xdd sys/kern/vfs_lookup.c:413
#6 namei+0x55a sys/kern/vfs_lookup.c:245
#7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3055
#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
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10142 6491K 6944K 78643K 12899 0
pcb 13 8K 8K 78643K 120 0
rtable 104 3K 3K 78643K 313 0
ifaddr 53 12K 12K 78643K 134 0
counters 44 34K 34K 78643K 68 0
ioctlops 0 0K 4K 78643K 1516 0
iov 0 0K 16K 78643K 29 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 6 0
vnodes 1218 77K 77K 78643K 1819 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 13 0
VM map 2 1K 1K 78643K 2 0
sem 11 1K 1K 78643K 17 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 5 13K 25K 78643K 2289 0
sigio 0 0K 0K 78643K 39 0
proc 71 87K 111K 78643K 378 0
subproc 32 2K 2K 78643K 51 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 102 0
in_multi 33 2K 2K 78643K 206 0
ether_multi 1 0K 0K 78643K 36 0
mrt 0 0K 0K 78643K 40 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 2K 78643K 446 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 186 26K 34K 78643K 28730 0
UVM aobj 5 2K 2K 78643K 5 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 91 0
NDP 8 0K 0K 78643K 26 0
temp 114 4206K 4270K 78643K 7839 0
kqueue 10 14K 22K 78643K 171 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 42 0 39 1 0 1 1 0 8 0
rtentry 112 92 0 48 2 0 2 2 0 8 0
unpcb 120 485 0 468 1 0 1 1 0 8 0
syncache 296 15 0 15 2 2 0 1 0 8 0
tcpqe 32 25 0 25 2 2 0 1 0 8 0
tcpcb 736 365 0 361 9 6 3 3 0 8 2
arp 120 8 0 2 1 0 1 1 0 8 0
inpcb 304 854 0 847 3 2 1 2 0 8 0
rttmr 72 10 0 10 1 1 0 1 0 8 0
nd6 48 35 0 29 1 0 1 1 0 8 0
kcovpl 48 3 0 1 1 0 1 1 0 8 0
ppxss 1248 11 0 11 2 1 1 1 0 8 1
pffrag 232 1 0 1 1 1 0 1 0 482 0
pffrnode 88 1 0 1 1 1 0 1 0 8 0
pffrent 40 5 0 5 1 1 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
pfstitem 24 71 0 46 1 0 1 1 0 8 0
pfstkey 112 71 0 46 2 0 2 2 0 8 0
pfstate 320 71 0 46 6 2 4 5 0 8 1
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 256 236 0 48 12 0 12 12 0 8 0
art_table 32 237 0 48 2 0 2 2 0 8 0
art_node 16 91 0 51 1 0 1 1 0 8 0
sysvmsgpl 40 38 0 27 1 0 1 1 0 8 0
semupl 112 5 0 5 1 1 0 1 0 8 0
semapl 112 9 0 0 1 0 1 1 0 8 0
shmpl 112 2 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 4262 0 2854 89 0 89 89 0 8 0
ffsino 272 4262 0 2854 95 0 95 95 0 8 0
nchpl 144 7016 0 5402 61 0 61 61 0 8 0
uvmvnodes 72 4725 0 0 86 0 86 86 0 8 0
vnodes 224 4725 0 0 278 0 278 278 0 8 0
namei 1024 17670 0 17669 1 0 1 1 0 8 0
percpumem 16 46 0 12 1 0 1 1 0 8 0
scxspl 216 20281 0 20280 9 8 1 8 0 8 0
plimitpl 152 64 0 55 1 0 1 1 0 8 0
sigapl 424 2538 0 2503 6 1 5 5 0 8 1
futexpl 56 16625 0 16625 1 0 1 1 0 8 1
knotepl 112 63 0 0 2 0 2 2 0 8 0
kqueuepl 216 924 0 914 1 0 1 1 0 8 0
pipepl 336 155 0 145 6 4 2 2 0 8 1
fdescpl 496 2521 0 2503 3 0 3 3 0 8 0
filepl 152 7819 0 7704 5 0 5 5 0 8 0
lockfpl 104 210 0 208 1 0 1 1 0 8 0
lockfspl 48 76 0 74 1 0 1 1 0 8 0
sessionpl 144 19 0 8 1 0 1 1 0 8 0
pgrppl 48 19 0 8 1 0 1 1 0 8 0
ucredpl 96 1055 0 1043 1 0 1 1 0 8 0
zombiepl 144 2503 0 2503 1 0 1 1 0 8 1
processpl 1072 2538 0 2503 3 0 3 3 0 8 0
procpl 672 5073 0 5030 7 3 4 5 0 8 0
sosppl 168 11 0 11 1 1 0 1 0 8 0
sockpl 480 1382 0 1355 4 0 4 4 0 8 0
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl16k 16384 17 0 0 3 0 3 3 0 8 0
mcl12k 12288 12 0 0 2 0 2 2 0 8 0
mcl9k 9216 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 6 0 0 1 0 1 1 0 8 0
mcl4k 4096 6 0 0 1 0 1 1 0 8 0
mcl2k2 2112 9 0 0 1 0 1 1 0 8 0
mcl2k 2048 195 0 0 17 0 17 17 0 8 0
mtagpl 96 119 0 0 3 0 3 3 0 8 0
mbufpl 256 652 0 0 37 1 36 36 0 8 0
bufpl 280 5921 0 134 414 0 414 414 0 8 0
anonpl 24 621976 0 615087 62 18 44 54 0 186 1
amapchunkpl 152 67929 0 67537 26 9 17 22 0 158 1
amappl16 200 4506 0 4339 12 3 9 11 0 8 0
amappl15 192 1 0 0 1 0 1 1 0 8 0
amappl14 184 4 0 2 1 0 1 1 0 8 0
amappl13 176 1242 0 1239 1 0 1 1 0 8 0
amappl12 168 1 0 1 1 1 0 1 0 8 0
amappl11 160 44 0 29 1 0 1 1 0 8 0
amappl10 152 50 0 43 1 0 1 1 0 8 0
amappl9 144 16 0 14 1 0 1 1 0 8 0
amappl8 136 1503 0 1462 3 1 2 2 0 8 0
amappl7 128 1178 0 1159 1 0 1 1 0 8 0
amappl6 120 131 0 121 1 0 1 1 0 8 0
amappl5 112 1721 0 1703 1 0 1 1 0 8 0
amappl4 104 667 0 643 1 0 1 1 0 8 0
amappl3 96 1295 0 1290 1 0 1 1 0 8 0
amappl2 88 1658 0 1606 2 0 2 2 0 8 0
amappl1 80 44104 0 43660 13 3 10 13 0 8 0
amappl 88 28241 0 28112 4 0 4 4 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 64 4 0 0 1 0 1 1 0 8 0
uaddrrnd 24 2521 0 2503 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2521 0 2503 1 0 1 1 0 8 0
vmmpekpl 168 17484 0 17461 2 0 2 2 0 8 0
vmmpepl 168 277636 0 276172 73 4 69 70 0 357 2
vmsppl 368 2520 0 2503 2 0 2 2 0 8 0
rwobjpl 56 48893 0 47993 16 3 13 14 0 8 0
pdppl 4096 5050 0 5006 62 16 46 50 0 8 2
pvpl 32 1361128 0 1350736 167 78 89 136 0 265 3
pmappl 224 2520 0 2503 2 0 2 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 345 0 30 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:399
witness_checkorder(fffffd8068e6db40,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8068e6db40,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105
rw_enter(fffffd8068e6db30,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd8068e6db30,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd8066144a88,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd8066144a88,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd807304ba70,0,ffff8000242b3048,ffff8000242b3018,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd807304ba70,0,ffff8000242b3048,ffff8000242b3018,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff8000242b31b0,ffff8000242b31e8,ffff8000242b3130,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd806ee78e68,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff8000242b3340,20000080) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff8000242b3340) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff8000242b3570) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000242b3570) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbcd2eb07a00, count: -15
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:353
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020d38ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -5


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

Anton Lindqvist

unread,
Aug 23, 2021, 1:23:58 AMAug 23
to syzbot, syzkaller-o...@googlegroups.com
#syz invalid
Reply all
Reply to author
Forward
0 new messages