uvm_fault: x86_ipi_db (7)
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syzbot
Dec 30, 2021, 5:05:19 AM12/30/21
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: e7d770b65149 Sync rcexec with reality.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11f03bdbb00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=72298724beda82ec8e7f
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+722987...@syzkaller.appspotmail.com
*cpu0: uvm_fault(0xfffffd806894e180, 0x668, 0, 2) -> e
ddb{1}> trace
proc_trampoline() at proc_trampoline+0xdc
end of kernel
end trace frame: 0x204243bf7c0, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff8000242b6960
rbx 0
rdx 0
rcx 0
rax 0x2a
r8 0xffff8000242b6890
r9 0
r10 0x175c74c09007d433
r11 0xec8cdc846ccdf53c
r12 0
r13 0
r14 0
r15 0
rip 0xffffffff8194e50c proc_trampoline+0xdc
cs 0x8
rflags 0x246
rsp 0xffff8000242b68e0
ss 0
proc_trampoline+0xdc: movl $0,%gs:0x538
ddb{1}> show proc
PROC (syz-executor.2) pid=149876 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=51, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff8000211eea80,0xffffffff8293ceb0
process=0xffff8000ffffa998 user=0xffff8000242b1000, vmspace=0xfffffd806894e010
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
55521 457727 97354 0 2 0 syz-executor.2
*55521 149876 97354 0 7 0x4000000 syz-executor.2
3292 120721 54517 0 2 0 syz-executor.0
3292 107001 54517 0 3 0x4000080 pipewr syz-executor.0
50088 409606 24616 0 2 0 syz-executor.1
50088 294474 24616 0 7 0x4000000 syz-executor.1
81410 260817 32698 0 2 0x2 syz-executor.3
97354 415714 32698 0 3 0x82 nanoslp syz-executor.2
24616 186187 32698 0 3 0x82 nanoslp syz-executor.1
54517 350641 32698 0 3 0x82 nanoslp syz-executor.0
32698 254644 23269 0 3 0x82 thrsleep syz-fuzzer
32698 404526 23269 0 3 0x4000082 nanoslp syz-fuzzer
32698 407327 23269 0 2 0x4000002 syz-fuzzer
32698 323204 23269 0 3 0x4000082 thrsleep syz-fuzzer
32698 214665 23269 0 3 0x4000082 thrsleep syz-fuzzer
32698 72509 23269 0 3 0x4000082 thrsleep syz-fuzzer
32698 344533 23269 0 3 0x4000082 nanoslp syz-fuzzer
23269 47424 3394 0 3 0x10008a sigsusp ksh
3394 202709 55055 0 3 0x9a poll sshd
61266 229280 1 0 3 0x100083 ttyin getty
55055 173084 1 0 3 0x88 poll sshd
1000 211928 77763 74 3 0x100092 bpf pflogd
77763 164230 1 0 3 0x80 netio pflogd
19330 230846 43431 73 3 0x100090 kqread syslogd
43431 61545 1 0 3 0x100082 netio syslogd
29 227439 1 0 3 0x100080 kqread resolvd
47206 113915 21198 77 3 0x100092 kqread dhcpleased
44467 506903 21198 77 3 0x100092 kqread dhcpleased
21198 95870 1 0 3 0x80 kqread dhcpleased
33738 336452 0 0 3 0x14200 bored smr
73239 180830 0 0 2 0x14200 zerothread
67021 112338 0 0 3 0x14200 aiodoned aiodoned
66638 26475 0 0 3 0x14200 syncer update
42950 356113 0 0 3 0x14200 cleaner cleaner
37270 416423 0 0 3 0x14200 reaper reaper
30388 204850 0 0 3 0x14200 pgdaemon pagedaemon
30964 211038 0 0 3 0x14200 bored viomb
96273 96211 0 0 3 0x40014200 acpi0 acpi0
64577 432128 0 0 3 0x40014200 idle1
82490 139820 0 0 3 0x14200 bored softnet
58741 347803 0 0 3 0x14200 bored systqmp
59148 140220 0 0 3 0x14200 bored systq
25811 193853 0 0 3 0x40014200 bored softclock
28963 452507 0 0 3 0x40014200 idle0
1 382193 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807f0009c0)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pmap_enter+0x1af rcr3 machine/cpufunc.h:141 [inline]
#3 pmap_enter+0x1af pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline]
#3 pmap_enter+0x1af sys/arch/amd64/amd64/pmap.c:2691
#4 uvm_fault_lower+0x77c sys/uvm/uvm_fault.c:1482
#5 uvm_fault+0x248
#6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#7 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
#8 recall_trap+0x8
Process 55521 (syz-executor.2) thread 0xffff8000211ef7a0 (149876)
exclusive rwlock amaplk r = 0 (0xfffffd806903a748)
#0 witness_lock+0x44d
#1 uvm_fault_check+0x3ca sys/uvm/uvm_fault.c:774
#2 uvm_fault+0x102 sys/uvm/uvm_fault.c:602
#3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#4 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
#5 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffffd806894e028)
#0 witness_lock+0x44d
#1 uvmfault_lookup+0xe9 sys/uvm/uvm_fault.c:1744
#2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
#3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602
#4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
#6 recall_trap+0x8
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807f0009c0)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pmap_enter+0x1af rcr3 machine/cpufunc.h:141 [inline]
#3 pmap_enter+0x1af pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline]
#3 pmap_enter+0x1af sys/arch/amd64/amd64/pmap.c:2691
#4 uvm_fault_lower+0x77c sys/uvm/uvm_fault.c:1482
#5 uvm_fault+0x248
#6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#7 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
#8 recall_trap+0x8
Process 50088 (syz-executor.1) thread 0xffff8000211ee2a0 (294474)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828f9c10)
#0 witness_lock+0x44d
#1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
#2 Xsyscall+0x128
Process 81410 (syz-executor.3) thread 0xffff8000211eed20 (260817)
exclusive rrwlock inode r = 0 (0xfffffd8069c36e70)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 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:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vget+0x1d3 sys/kern/vfs_subr.c:677
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318
#8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:561
#11 namei+0x36a sys/kern/vfs_lookup.c:245
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849
#13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806a654c48)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 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:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413
#6 namei+0x36a sys/kern/vfs_lookup.c:245
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849
#8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#9 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10157 6465K 6465K 78643K 11247 0
pcb 13 8K 8K 78643K 13 0
rtable 150 4K 4K 78643K 232 0
ifaddr 58 13K 13K 78643K 60 0
counters 48 34K 34K 78643K 48 0
ioctlops 0 0K 4K 78643K 1483 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1232 77K 77K 78643K 1237 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 9 29K 49K 78643K 71 0
proc 67 87K 111K 78643K 393 0
subproc 52 3K 3K 78643K 52 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 55 3K 3K 78643K 55 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 448 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 189 39K 40K 78643K 2200 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 16 1K 1K 78643K 16 0
temp 57 4187K 4251K 78643K 3545 0
kqueue 10 14K 14K 78643K 10 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 25 0 22 1 0 1 1 0 8 0
rtentry 112 67 0 1 2 0 2 2 0 8 0
unpcb 136 35 0 20 1 0 1 1 0 8 0
syncache 296 4 0 4 1 0 1 1 0 8 1
tcpcb 736 7 0 3 1 0 1 1 0 8 0
arp 120 10 0 0 1 0 1 1 0 8 0
inpcb 304 45 0 38 1 0 1 1 0 8 0
nd6 48 12 0 0 1 0 1 1 0 8 0
kcovpl 48 4 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 11 0 0 1 0 1 1 0 8 0
pfstkey 112 11 0 0 1 0 1 1 0 8 0
pfstate 320 11 0 0 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 256 276 0 0 18 0 18 18 0 8 0
art_table 32 277 0 0 3 0 3 3 0 8 0
art_node 16 66 0 6 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1445 0 30 89 0 89 89 0 8 0
ffsino 272 1445 0 30 95 0 95 95 0 8 0
nchpl 144 1674 0 48 61 0 61 61 0 8 0
uvmvnodes 80 1507 0 0 31 0 31 31 0 8 0
vnodes 224 1507 0 0 89 0 89 89 0 8 0
namei 1024 4893 0 4893 1 0 1 1 0 8 1
percpumem 16 36 0 0 1 0 1 1 0 8 0
scxspl 216 4884 0 4884 2 1 1 2 0 8 1
plimitpl 152 19 0 8 1 0 1 1 0 8 0
sigapl 424 309 0 273 5 0 5 5 0 8 0
futexpl 64 8 0 8 1 0 1 1 0 8 1
knotepl 112 64 0 0 2 0 2 2 0 8 0
kqueuepl 216 6 0 0 1 0 1 1 0 8 0
pipepl 336 89 0 72 2 0 2 2 0 8 0
fdescpl 496 295 0 273 4 0 4 4 0 8 0
filepl 152 1290 0 1137 6 0 6 6 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 20 0 7 1 0 1 1 0 8 0
pgrppl 48 20 0 7 1 0 1 1 0 8 0
ucredpl 96 60 0 48 1 0 1 1 0 8 0
zombiepl 144 273 0 273 1 0 1 1 0 8 1
processpl 1064 309 0 273 3 0 3 3 0 8 0
procpl 672 320 0 275 4 0 4 4 0 8 0
sockpl 480 105 0 80 4 0 4 4 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 91 0 0 11 0 11 11 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 192 0 0 12 0 12 12 0 8 0
bufpl 288 3567 0 141 245 0 245 245 0 8 0
anonpl 24 46476 0 40675 41 4 37 37 0 186 1
amapchunkpl 152 4804 0 4373 20 0 20 20 0 158 1
amappl16 200 278 0 183 6 0 6 6 0 8 0
amappl15 192 2 0 0 1 0 1 1 0 8 0
amappl14 184 7 0 4 1 0 1 1 0 8 0
amappl13 176 43 0 41 1 0 1 1 0 8 0
amappl12 168 40 0 33 1 0 1 1 0 8 0
amappl11 160 57 0 41 1 0 1 1 0 8 0
amappl10 152 58 0 49 1 0 1 1 0 8 0
amappl9 144 493 0 487 1 0 1 1 0 8 0
amappl8 136 343 0 324 1 0 1 1 0 8 0
amappl7 128 75 0 66 1 0 1 1 0 8 0
amappl6 120 163 0 144 1 0 1 1 0 8 0
amappl5 112 165 0 147 1 0 1 1 0 8 0
amappl4 104 604 0 583 1 0 1 1 0 8 0
amappl3 96 162 0 144 1 0 1 1 0 8 0
amappl2 88 363 0 322 2 0 2 2 0 8 1
amappl1 80 8505 0 8016 13 0 13 13 0 8 2
amappl 88 1881 0 1728 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 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 295 0 273 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 295 0 273 1 0 1 1 0 8 0
vmmpekpl 168 6702 0 6662 2 0 2 2 0 8 0
vmmpepl 168 29375 0 27848 70 0 70 70 0 357 0
vmsppl 368 294 0 273 3 0 3 3 0 8 0
rwobjpl 56 10161 0 7777 36 0 36 36 0 8 0
pdppl 4096 598 0 546 74 12 62 62 0 8 10
pvpl 32 172242 0 162862 141 0 141 141 0 265 63
pmappl 248 294 0 273 2 0 2 2 0 8 0
extentpl 40 57 0 38 1 0 1 1 0 8 0
phpool 112 562 0 15 16 0 16 16 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff82779ff0) 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_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:639
comcnputc(800,20) at comcnputc+0x97 sys/dev/ic/com.c:1259
cnputc(20) at cnputc+0x4b sys/dev/cons.c:239
db_putchar(2d) at db_putchar+0x316 db_force_whitespace sys/ddb/db_output.c:102 [inline]
db_putchar(2d) at db_putchar+0x316 sys/ddb/db_output.c:153
kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068
db_printf(ffffffff824fe220) at db_printf+0x85 sys/kern/subr_prf.c:502
fault(ffffffff824b579c) at fault+0x95 sys/arch/amd64/amd64/trap.c:154
kpageflttrap(ffff800027af01d0,668) at kpageflttrap+0x25a sys/arch/amd64/amd64/trap.c:275
kerntrap(ffff800027af01d0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pppacopen(86353,1,2000,ffff8000211ee2a0) at pppacopen+0x1b5 sys/net/if_pppx.c:1020
end trace frame: 0xffff800027af0340, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff82779ff0) 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_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:639
comcnputc(800,20) at comcnputc+0x97 sys/dev/ic/com.c:1259
cnputc(20) at cnputc+0x4b sys/dev/cons.c:239
db_putchar(2d) at db_putchar+0x316 db_force_whitespace sys/ddb/db_output.c:102 [inline]
db_putchar(2d) at db_putchar+0x316 sys/ddb/db_output.c:153
kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068
db_printf(ffffffff824fe220) at db_printf+0x85 sys/kern/subr_prf.c:502
fault(ffffffff824b579c) at fault+0x95 sys/arch/amd64/amd64/trap.c:154
kpageflttrap(ffff800027af01d0,668) at kpageflttrap+0x25a sys/arch/amd64/amd64/trap.c:275
kerntrap(ffff800027af01d0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pppacopen(86353,1,2000,ffff8000211ee2a0) at pppacopen+0x1b5 sys/net/if_pppx.c:1020
spec_open(ffff800027af0358) at spec_open+0x3d7 sys/kern/spec_vnops.c:157
VOP_OPEN(fffffd80695b76b8,1,fffffd807f7d7480,ffff8000211ee2a0) at VOP_OPEN+0x75 sys/kern/vfs_vops.c:138
vn_open(ffff800027af05a8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000211ee2a0,ffffff9c,20000780,0,0,ffff800027af0790) at doopenat+0x26a sys/kern/vfs_syscalls.c:1128
syscall(ffff800027af0800) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800027af0800) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x21501e0b630, count: -20
ddb{0}> machine ddbcpu 1
Stopped at proc_trampoline+0xdc: movl $0,%gs:0x538
proc_trampoline() at proc_trampoline+0xdc
end of kernel
end trace frame: 0x204243bf7c0, count: 14
ddb{1}> trace
proc_trampoline() at proc_trampoline+0xdc
end of kernel
end trace frame: 0x204243bf7c0, count: -1
---
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.
syzbot found the following issue on:
HEAD commit: e7d770b65149 Sync rcexec with reality.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11f03bdbb00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=72298724beda82ec8e7f
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+722987...@syzkaller.appspotmail.com
*cpu0: uvm_fault(0xfffffd806894e180, 0x668, 0, 2) -> e
ddb{1}> trace
proc_trampoline() at proc_trampoline+0xdc
end of kernel
end trace frame: 0x204243bf7c0, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff8000242b6960
rbx 0
rdx 0
rcx 0
rax 0x2a
r8 0xffff8000242b6890
r9 0
r10 0x175c74c09007d433
r11 0xec8cdc846ccdf53c
r12 0
r13 0
r14 0
r15 0
rip 0xffffffff8194e50c proc_trampoline+0xdc
cs 0x8
rflags 0x246
rsp 0xffff8000242b68e0
ss 0
proc_trampoline+0xdc: movl $0,%gs:0x538
ddb{1}> show proc
PROC (syz-executor.2) pid=149876 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=51, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff8000211eea80,0xffffffff8293ceb0
process=0xffff8000ffffa998 user=0xffff8000242b1000, vmspace=0xfffffd806894e010
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
55521 457727 97354 0 2 0 syz-executor.2
*55521 149876 97354 0 7 0x4000000 syz-executor.2
3292 120721 54517 0 2 0 syz-executor.0
3292 107001 54517 0 3 0x4000080 pipewr syz-executor.0
50088 409606 24616 0 2 0 syz-executor.1
50088 294474 24616 0 7 0x4000000 syz-executor.1
81410 260817 32698 0 2 0x2 syz-executor.3
97354 415714 32698 0 3 0x82 nanoslp syz-executor.2
24616 186187 32698 0 3 0x82 nanoslp syz-executor.1
54517 350641 32698 0 3 0x82 nanoslp syz-executor.0
32698 254644 23269 0 3 0x82 thrsleep syz-fuzzer
32698 404526 23269 0 3 0x4000082 nanoslp syz-fuzzer
32698 407327 23269 0 2 0x4000002 syz-fuzzer
32698 323204 23269 0 3 0x4000082 thrsleep syz-fuzzer
32698 214665 23269 0 3 0x4000082 thrsleep syz-fuzzer
32698 72509 23269 0 3 0x4000082 thrsleep syz-fuzzer
32698 344533 23269 0 3 0x4000082 nanoslp syz-fuzzer
23269 47424 3394 0 3 0x10008a sigsusp ksh
3394 202709 55055 0 3 0x9a poll sshd
61266 229280 1 0 3 0x100083 ttyin getty
55055 173084 1 0 3 0x88 poll sshd
1000 211928 77763 74 3 0x100092 bpf pflogd
77763 164230 1 0 3 0x80 netio pflogd
19330 230846 43431 73 3 0x100090 kqread syslogd
43431 61545 1 0 3 0x100082 netio syslogd
29 227439 1 0 3 0x100080 kqread resolvd
47206 113915 21198 77 3 0x100092 kqread dhcpleased
44467 506903 21198 77 3 0x100092 kqread dhcpleased
21198 95870 1 0 3 0x80 kqread dhcpleased
33738 336452 0 0 3 0x14200 bored smr
73239 180830 0 0 2 0x14200 zerothread
67021 112338 0 0 3 0x14200 aiodoned aiodoned
66638 26475 0 0 3 0x14200 syncer update
42950 356113 0 0 3 0x14200 cleaner cleaner
37270 416423 0 0 3 0x14200 reaper reaper
30388 204850 0 0 3 0x14200 pgdaemon pagedaemon
30964 211038 0 0 3 0x14200 bored viomb
96273 96211 0 0 3 0x40014200 acpi0 acpi0
64577 432128 0 0 3 0x40014200 idle1
82490 139820 0 0 3 0x14200 bored softnet
58741 347803 0 0 3 0x14200 bored systqmp
59148 140220 0 0 3 0x14200 bored systq
25811 193853 0 0 3 0x40014200 bored softclock
28963 452507 0 0 3 0x40014200 idle0
1 382193 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807f0009c0)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pmap_enter+0x1af rcr3 machine/cpufunc.h:141 [inline]
#3 pmap_enter+0x1af pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline]
#3 pmap_enter+0x1af sys/arch/amd64/amd64/pmap.c:2691
#4 uvm_fault_lower+0x77c sys/uvm/uvm_fault.c:1482
#5 uvm_fault+0x248
#6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#7 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
#8 recall_trap+0x8
Process 55521 (syz-executor.2) thread 0xffff8000211ef7a0 (149876)
exclusive rwlock amaplk r = 0 (0xfffffd806903a748)
#0 witness_lock+0x44d
#1 uvm_fault_check+0x3ca sys/uvm/uvm_fault.c:774
#2 uvm_fault+0x102 sys/uvm/uvm_fault.c:602
#3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#4 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
#5 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffffd806894e028)
#0 witness_lock+0x44d
#1 uvmfault_lookup+0xe9 sys/uvm/uvm_fault.c:1744
#2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
#3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602
#4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
#6 recall_trap+0x8
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807f0009c0)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pmap_enter+0x1af rcr3 machine/cpufunc.h:141 [inline]
#3 pmap_enter+0x1af pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline]
#3 pmap_enter+0x1af sys/arch/amd64/amd64/pmap.c:2691
#4 uvm_fault_lower+0x77c sys/uvm/uvm_fault.c:1482
#5 uvm_fault+0x248
#6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#7 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
#8 recall_trap+0x8
Process 50088 (syz-executor.1) thread 0xffff8000211ee2a0 (294474)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828f9c10)
#0 witness_lock+0x44d
#1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
#2 Xsyscall+0x128
Process 81410 (syz-executor.3) thread 0xffff8000211eed20 (260817)
exclusive rrwlock inode r = 0 (0xfffffd8069c36e70)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 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:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vget+0x1d3 sys/kern/vfs_subr.c:677
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318
#8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:561
#11 namei+0x36a sys/kern/vfs_lookup.c:245
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849
#13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806a654c48)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 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:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413
#6 namei+0x36a sys/kern/vfs_lookup.c:245
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849
#8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#9 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10157 6465K 6465K 78643K 11247 0
pcb 13 8K 8K 78643K 13 0
rtable 150 4K 4K 78643K 232 0
ifaddr 58 13K 13K 78643K 60 0
counters 48 34K 34K 78643K 48 0
ioctlops 0 0K 4K 78643K 1483 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1232 77K 77K 78643K 1237 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 9 29K 49K 78643K 71 0
proc 67 87K 111K 78643K 393 0
subproc 52 3K 3K 78643K 52 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 55 3K 3K 78643K 55 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 448 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 189 39K 40K 78643K 2200 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 16 1K 1K 78643K 16 0
temp 57 4187K 4251K 78643K 3545 0
kqueue 10 14K 14K 78643K 10 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 25 0 22 1 0 1 1 0 8 0
rtentry 112 67 0 1 2 0 2 2 0 8 0
unpcb 136 35 0 20 1 0 1 1 0 8 0
syncache 296 4 0 4 1 0 1 1 0 8 1
tcpcb 736 7 0 3 1 0 1 1 0 8 0
arp 120 10 0 0 1 0 1 1 0 8 0
inpcb 304 45 0 38 1 0 1 1 0 8 0
nd6 48 12 0 0 1 0 1 1 0 8 0
kcovpl 48 4 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 11 0 0 1 0 1 1 0 8 0
pfstkey 112 11 0 0 1 0 1 1 0 8 0
pfstate 320 11 0 0 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 256 276 0 0 18 0 18 18 0 8 0
art_table 32 277 0 0 3 0 3 3 0 8 0
art_node 16 66 0 6 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1445 0 30 89 0 89 89 0 8 0
ffsino 272 1445 0 30 95 0 95 95 0 8 0
nchpl 144 1674 0 48 61 0 61 61 0 8 0
uvmvnodes 80 1507 0 0 31 0 31 31 0 8 0
vnodes 224 1507 0 0 89 0 89 89 0 8 0
namei 1024 4893 0 4893 1 0 1 1 0 8 1
percpumem 16 36 0 0 1 0 1 1 0 8 0
scxspl 216 4884 0 4884 2 1 1 2 0 8 1
plimitpl 152 19 0 8 1 0 1 1 0 8 0
sigapl 424 309 0 273 5 0 5 5 0 8 0
futexpl 64 8 0 8 1 0 1 1 0 8 1
knotepl 112 64 0 0 2 0 2 2 0 8 0
kqueuepl 216 6 0 0 1 0 1 1 0 8 0
pipepl 336 89 0 72 2 0 2 2 0 8 0
fdescpl 496 295 0 273 4 0 4 4 0 8 0
filepl 152 1290 0 1137 6 0 6 6 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 20 0 7 1 0 1 1 0 8 0
pgrppl 48 20 0 7 1 0 1 1 0 8 0
ucredpl 96 60 0 48 1 0 1 1 0 8 0
zombiepl 144 273 0 273 1 0 1 1 0 8 1
processpl 1064 309 0 273 3 0 3 3 0 8 0
procpl 672 320 0 275 4 0 4 4 0 8 0
sockpl 480 105 0 80 4 0 4 4 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 91 0 0 11 0 11 11 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 192 0 0 12 0 12 12 0 8 0
bufpl 288 3567 0 141 245 0 245 245 0 8 0
anonpl 24 46476 0 40675 41 4 37 37 0 186 1
amapchunkpl 152 4804 0 4373 20 0 20 20 0 158 1
amappl16 200 278 0 183 6 0 6 6 0 8 0
amappl15 192 2 0 0 1 0 1 1 0 8 0
amappl14 184 7 0 4 1 0 1 1 0 8 0
amappl13 176 43 0 41 1 0 1 1 0 8 0
amappl12 168 40 0 33 1 0 1 1 0 8 0
amappl11 160 57 0 41 1 0 1 1 0 8 0
amappl10 152 58 0 49 1 0 1 1 0 8 0
amappl9 144 493 0 487 1 0 1 1 0 8 0
amappl8 136 343 0 324 1 0 1 1 0 8 0
amappl7 128 75 0 66 1 0 1 1 0 8 0
amappl6 120 163 0 144 1 0 1 1 0 8 0
amappl5 112 165 0 147 1 0 1 1 0 8 0
amappl4 104 604 0 583 1 0 1 1 0 8 0
amappl3 96 162 0 144 1 0 1 1 0 8 0
amappl2 88 363 0 322 2 0 2 2 0 8 1
amappl1 80 8505 0 8016 13 0 13 13 0 8 2
amappl 88 1881 0 1728 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 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 295 0 273 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 295 0 273 1 0 1 1 0 8 0
vmmpekpl 168 6702 0 6662 2 0 2 2 0 8 0
vmmpepl 168 29375 0 27848 70 0 70 70 0 357 0
vmsppl 368 294 0 273 3 0 3 3 0 8 0
rwobjpl 56 10161 0 7777 36 0 36 36 0 8 0
pdppl 4096 598 0 546 74 12 62 62 0 8 10
pvpl 32 172242 0 162862 141 0 141 141 0 265 63
pmappl 248 294 0 273 2 0 2 2 0 8 0
extentpl 40 57 0 38 1 0 1 1 0 8 0
phpool 112 562 0 15 16 0 16 16 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff82779ff0) 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_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:639
comcnputc(800,20) at comcnputc+0x97 sys/dev/ic/com.c:1259
cnputc(20) at cnputc+0x4b sys/dev/cons.c:239
db_putchar(2d) at db_putchar+0x316 db_force_whitespace sys/ddb/db_output.c:102 [inline]
db_putchar(2d) at db_putchar+0x316 sys/ddb/db_output.c:153
kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068
db_printf(ffffffff824fe220) at db_printf+0x85 sys/kern/subr_prf.c:502
fault(ffffffff824b579c) at fault+0x95 sys/arch/amd64/amd64/trap.c:154
kpageflttrap(ffff800027af01d0,668) at kpageflttrap+0x25a sys/arch/amd64/amd64/trap.c:275
kerntrap(ffff800027af01d0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pppacopen(86353,1,2000,ffff8000211ee2a0) at pppacopen+0x1b5 sys/net/if_pppx.c:1020
end trace frame: 0xffff800027af0340, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff82779ff0) 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_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:639
comcnputc(800,20) at comcnputc+0x97 sys/dev/ic/com.c:1259
cnputc(20) at cnputc+0x4b sys/dev/cons.c:239
db_putchar(2d) at db_putchar+0x316 db_force_whitespace sys/ddb/db_output.c:102 [inline]
db_putchar(2d) at db_putchar+0x316 sys/ddb/db_output.c:153
kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068
db_printf(ffffffff824fe220) at db_printf+0x85 sys/kern/subr_prf.c:502
fault(ffffffff824b579c) at fault+0x95 sys/arch/amd64/amd64/trap.c:154
kpageflttrap(ffff800027af01d0,668) at kpageflttrap+0x25a sys/arch/amd64/amd64/trap.c:275
kerntrap(ffff800027af01d0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pppacopen(86353,1,2000,ffff8000211ee2a0) at pppacopen+0x1b5 sys/net/if_pppx.c:1020
spec_open(ffff800027af0358) at spec_open+0x3d7 sys/kern/spec_vnops.c:157
VOP_OPEN(fffffd80695b76b8,1,fffffd807f7d7480,ffff8000211ee2a0) at VOP_OPEN+0x75 sys/kern/vfs_vops.c:138
vn_open(ffff800027af05a8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000211ee2a0,ffffff9c,20000780,0,0,ffff800027af0790) at doopenat+0x26a sys/kern/vfs_syscalls.c:1128
syscall(ffff800027af0800) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800027af0800) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x21501e0b630, count: -20
ddb{0}> machine ddbcpu 1
Stopped at proc_trampoline+0xdc: movl $0,%gs:0x538
proc_trampoline() at proc_trampoline+0xdc
end of kernel
end trace frame: 0x204243bf7c0, count: 14
ddb{1}> trace
proc_trampoline() at proc_trampoline+0xdc
end of kernel
end trace frame: 0x204243bf7c0, count: -1
---
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