panic: acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
90704 71752 0 0 0 1 syz-executor.1
*252819 20575 0 0 0 0K syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824767b0) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(ffffffff8293e670,1,0) at witness_checkorder+0x11eb sys/kern/subr_witness.c:833
rw_enter_read(ffffffff8293e660) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff800021288270,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701
uvm_fault_check(ffff800021288270,ffff8000212882a8,ffff8000212882d0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(ffffffff8293e658,ffff800024490000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:601
kpageflttrap(ffff800021288400,ffff800024490ff8) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff800021288400) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
memcpy() at memcpy+0x15
timeout_run(ffff8000211ef088) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
timeout_run(ffff8000211ef088) at timeout_run+0xd6 sys/kern/kern_timeout.c:680
softclock_process_tick_timeout(ffff8000211ef088,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:756
end trace frame: 0xffff800021288640, count: 0
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: acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824767b0) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(ffffffff8293e670,1,0) at witness_checkorder+0x11eb sys/kern/subr_witness.c:833
rw_enter_read(ffffffff8293e660) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff800021288270,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701
uvm_fault_check(ffff800021288270,ffff8000212882a8,ffff8000212882d0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(ffffffff8293e658,ffff800024490000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:601
kpageflttrap(ffff800021288400,ffff800024490ff8) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff800021288400) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
memcpy() at memcpy+0x15
timeout_run(ffff8000211ef088) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
timeout_run(ffff8000211ef088) at timeout_run+0xd6 sys/kern/kern_timeout.c:680
softclock_process_tick_timeout(ffff8000211ef088,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:756
softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
__mp_lock(ffffffff828a8868) at __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline]
__mp_lock(ffffffff828a8868) at __mp_lock+0x120 sys/kern/kern_lock.c:147
uvm_fault(fffffd80085962e0,2963c307000,0,1) at uvm_fault+0x192 sys/uvm/uvm_fault.c:623
upageflttrap(ffff8000212889c0,2963c307000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff8000212889c0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffe6c90, count: -21
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800021287ed0
rbx 0xffffffff827cfbff cpu_info_full_primary+0x2bff
rdx 0x8b
rcx 0x2
rax 0x5e
r8 0xffffffff81e1ced4 kprintf+0x144
r9 0x1
r10 0xfe615acfbb96dab3
r11 0xf6a93dc360df6186
r12 0xffffffff827cfa00 cpu_info_full_primary+0x2a00
r13 0
r14 0
r15 0x1
rip 0xffffffff81c4e228 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800021287ec0
ss 0
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=252819 stat=onproc
flags process=0 proc=0
pri=79, usrpri=79, nice=20
forw=0xffffffffffffffff, list=0xffff8000211eed28,0xffff8000211ef518
process=0xffff8000211f25c0 user=0xffff800021283000, vmspace=0xfffffd80085962e0
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
71752 90704 87206 0 7 0 syz-executor.1
*20575 252819 8134 0 7 0 syz-executor.0
20575 184170 8134 0 3 0x4000080 fsleep syz-executor.0
87206 444780 94670 0 3 0x82 nanoslp syz-executor.1
8134 111732 94670 0 2 0x482 syz-executor.0
94670 388330 97666 0 3 0x82 thrsleep syz-fuzzer
94670 431867 97666 0 2 0x4000482 syz-fuzzer
94670 106366 97666 0 3 0x4000082 kqread syz-fuzzer
94670 258772 97666 0 3 0x4000082 thrsleep syz-fuzzer
94670 44340 97666 0 3 0x4000082 thrsleep syz-fuzzer
94670 151895 97666 0 3 0x4000082 thrsleep syz-fuzzer
94670 142487 97666 0 2 0x4000482 syz-fuzzer
94670 410673 97666 0 3 0x4000082 thrsleep syz-fuzzer
97666 133605 89182 0 3 0x10008a sigsusp ksh
89182 523332 19219 0 3 0x9a kqread sshd
65218 470672 1 0 3 0x100083 ttyin getty
19219 36588 1 0 3 0x88 kqread sshd
93009 200408 95533 74 3 0x100092 bpf pflogd
95533 400066 1 0 3 0x80 netio pflogd
44890 280273 53708 73 3 0x100090 kqread syslogd
53708 437866 1 0 3 0x100082 netio syslogd
83438 260759 1 0 3 0x100080 kqread resolvd
80741 123788 80601 77 3 0x100092 kqread dhcpleased
62195 56111 80601 77 3 0x100092 kqread dhcpleased
80601 495483 1 0 3 0x80 kqread dhcpleased
59808 44792 0 0 3 0x14200 bored smr
46557 251213 0 0 2 0x14200 zerothread
8224 394570 0 0 3 0x14200 aiodoned aiodoned
58080 281452 0 0 3 0x14200 syncer update
57210 228980 0 0 3 0x14200 cleaner cleaner
94282 315912 0 0 3 0x14200 reaper reaper
45879 80324 0 0 3 0x14200 pgdaemon pagedaemon
29542 349206 0 0 3 0x14200 bored viomb
73383 179457 0 0 3 0x40014200 acpi0 acpi0
4174 319899 0 0 3 0x40014200 idle1
55562 165056 0 0 3 0x14200 bored softnet
30859 81983 0 0 3 0x14200 bored systqmp
35897 405855 0 0 3 0x14200 bored systq
17403 493019 0 0 3 0x40014200 bored softclock
89674 412914 0 0 3 0x40014200 idle0
1 117600 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:125 r = 0 (0xffffffff827a5f08)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 kcov_remote_leave+0x1f sys/dev/kcov.c:674
#4 timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
#4 timeout_run+0xd6 sys/kern/kern_timeout.c:680
#5 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
#6 softclock+0x11a sys/kern/kern_timeout.c:756
#7 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
#8 Xsoftclock+0x1f
#9 __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline]
#9 __mp_lock+0x120 sys/kern/kern_lock.c:147
#10 uvm_fault+0x192 sys/uvm/uvm_fault.c:623
#11 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#12 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#13 recall_trap+0x8
shared mutex timeout r = 0 (0xffffffff8281c460)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 timeout_run+0xb7 sys/kern/kern_timeout.c:674
#2 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
#3 softclock+0x11a sys/kern/kern_timeout.c:756
#4 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
#5 Xsoftclock+0x1f
#6 __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline]
#6 __mp_lock+0x120 sys/kern/kern_lock.c:147
#7 uvm_fault+0x192 sys/uvm/uvm_fault.c:623
#8 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#9 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#10 recall_trap+0x8
Process 20575 (syz-executor.0) thread 0xffff8000211ee548 (252819)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828a8a70)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90
#2 Xsoftclock+0x1f
#3 __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline]
#3 __mp_lock+0x120 sys/kern/kern_lock.c:147
#4 uvm_fault+0x192 sys/uvm/uvm_fault.c:623
#5 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#6 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#7 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffffd80085962f8)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701
#2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
#3 uvm_fault+0x102 sys/uvm/uvm_fault.c:601
#4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#5 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#6 recall_trap+0x8
exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:125 r = 0 (0xffffffff827a5f08)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 kcov_remote_leave+0x1f sys/dev/kcov.c:674
#4 timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
#4 timeout_run+0xd6 sys/kern/kern_timeout.c:680
#5 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
#6 softclock+0x11a sys/kern/kern_timeout.c:756
#7 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
#8 Xsoftclock+0x1f
#9 __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline]
#9 __mp_lock+0x120 sys/kern/kern_lock.c:147
#10 uvm_fault+0x192 sys/uvm/uvm_fault.c:623
#11 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#12 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#13 recall_trap+0x8
shared mutex timeout r = 0 (0xffffffff8281c460)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 timeout_run+0xb7 sys/kern/kern_timeout.c:674
#2 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
#3 softclock+0x11a sys/kern/kern_timeout.c:756
#4 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
#5 Xsoftclock+0x1f
#6 __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline]
#6 __mp_lock+0x120 sys/kern/kern_lock.c:147
#7 uvm_fault+0x192 sys/uvm/uvm_fault.c:623
#8 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#9 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#10 recall_trap+0x8
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10117 6420K 6428K 78643K 11219 0
pcb 13 8K 8K 78643K 17 0
rtable 106 3K 3K 78643K 172 0
ifaddr 44 10K 10K 78643K 45 0
counters 44 34K 34K 78643K 44 0
ioctlops 0 0K 4K 78643K 1483 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1217 77K 77K 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 6411 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 31 148K 148K 78643K 31 0
exec 0 0K 2K 78643K 408 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 358 44K 45K 78643K 76335 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 6 0K 0K 78643K 10 0
temp 66 4199K 4263K 78643K 15125 0
kqueue 12 18K 18K 78643K 22 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 42 0 27 1 0 1 1 0 8 0
syncache 296 4 0 4 1 1 0 1 0 8 0
tcpqe 32 1191 0 1191 4 4 0 2 0 8 0
tcpcb 736 8 0 4 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 10 1 0 1 1 0 8 0
pfstkey 112 12 0 10 1 0 1 1 0 8 0
pfstate 320 12 0 10 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 7818 0 6407 89 0 89 89 0 8 0
ffsino 272 7818 0 6407 95 0 95 95 0 8 0
nchpl 144 14437 0 12817 61 0 61 61 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 30246 0 30246 2 1 1 1 0 8 1
percpumem 16 34 0 0 1 0 1 1 0 8 0
scxspl 216 43494 0 43494 10 9 1 8 0 8 1
plimitpl 152 17 0 8 1 0 1 1 0 8 0
sigapl 424 6660 0 6627 4 0 4 4 0 8 0
futexpl 56 22663 0 22662 1 0 1 1 0 8 0
knotepl 112 62 0 0 2 0 2 2 0 8 0
kqueuepl 216 6515 0 6504 2 0 2 2 0 8 1
pipepl 336 89 0 79 2 0 2 2 0 8 1
fdescpl 496 6646 0 6627 3 0 3 3 0 8 0
filepl 152 14189 0 14075 6 0 6 6 0 8 1
lockfpl 104 10 0 8 1 0 1 1 0 8 0
lockfspl 48 6 0 4 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 66 0 54 1 0 1 1 0 8 0
zombiepl 144 6627 0 6627 2 1 1 1 0 8 1
processpl 1072 6660 0 6627 3 0 3 3 0 8 0
procpl 672 13132 0 13091 5 1 4 4 0 8 0
sockpl 480 105 0 80 4 0 4 4 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 7 0 0 1 0 1 1 0 8 0
mcl8k 8192 5 0 0 1 0 1 1 0 8 0
mcl4k 4096 7 0 0 1 0 1 1 0 8 0
mcl2k2 2112 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 318 0 0 39 0 39 39 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 376 0 0 23 0 23 23 0 8 0
bufpl 280 10039 0 3710 453 0 453 453 0 8 0
anonpl 24 1628971 0 1591306 251 5 246 248 0 186 0
amapchunkpl 152 180686 0 179036 69 3 66 68 0 158 0
amappl16 200 9447 0 8500 51 1 50 50 0 8 0
amappl15 192 76 0 70 1 0 1 1 0 8 0
amappl14 184 1 0 1 1 1 0 1 0 8 0
amappl13 176 30 0 29 1 0 1 1 0 8 0
amappl12 168 8 0 6 1 0 1 1 0 8 0
amappl11 160 3267 0 3245 1 0 1 1 0 8 0
amappl10 152 18 0 12 1 0 1 1 0 8 0
amappl9 144 3557 0 3553 1 0 1 1 0 8 0
amappl8 136 423 0 375 2 0 2 2 0 8 0
amappl7 128 58 0 49 1 0 1 1 0 8 0
amappl6 120 3254 0 3243 1 0 1 1 0 8 0
amappl5 112 6589 0 6566 1 0 1 1 0 8 0
amappl4 104 3773 0 3745 1 0 1 1 0 8 0
amappl3 96 179 0 162 1 0 1 1 0 8 0
amappl2 88 358 0 322 2 1 1 2 0 8 0
amappl1 80 111603 0 111149 15 5 10 13 0 8 0
amappl 88 75993 0 75694 7 0 7 7 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 6646 0 6627 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 6646 0 6627 1 0 1 1 0 8 0
vmmpekpl 168 28431 0 28411 2 0 2 2 0 8 0
vmmpepl 168 732224 0 729724 148 37 111 144 0 357 2
vmsppl 368 6645 0 6627 2 0 2 2 0 8 0
rwobjpl 56 122409 0 120555 27 0 27 27 0 8 0
pdppl 4096 13300 0 13254 70 24 46 50 0 8 0
pvpl 32 3565716 0 3524319 364 8 356 363 0 265 0
pmappl 224 6645 0 6627 2 0 2 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 347 0 28 10 0 10 10 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(ffffffff824767b0) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(ffffffff8293e670,1,0) at witness_checkorder+0x11eb sys/kern/subr_witness.c:833
rw_enter_read(ffffffff8293e660) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff800021288270,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701
uvm_fault_check(ffff800021288270,ffff8000212882a8,ffff8000212882d0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(ffffffff8293e658,ffff800024490000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:601
kpageflttrap(ffff800021288400,ffff800024490ff8) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff800021288400) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
memcpy() at memcpy+0x15
timeout_run(ffff8000211ef088) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
timeout_run(ffff8000211ef088) at timeout_run+0xd6 sys/kern/kern_timeout.c:680
softclock_process_tick_timeout(ffff8000211ef088,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:756
softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
__mp_lock(ffffffff828a8868) at __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline]
__mp_lock(ffffffff828a8868) at __mp_lock+0x120 sys/kern/kern_lock.c:147
uvm_fault(fffffd80085962e0,2963c307000,0,1) at uvm_fault+0x192 sys/uvm/uvm_fault.c:623
upageflttrap(ffff8000212889c0,2963c307000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff8000212889c0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffe6c90, count: -21
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
__mp_lock(ffffffff828a8868) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828a8868) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff80002269ce00) at syscall+0x42d mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff80002269ce00) at syscall+0x42d sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd70e0, count: 9
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
__mp_lock(ffffffff828a8868) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828a8868) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff80002269ce00) at syscall+0x42d mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff80002269ce00) at syscall+0x42d sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd70e0, count: -6