panic: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 144 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 58685 94881 0 0 0 1 syz-executor 181748 2090 0 0x2 0x1 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ab136) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833ee48c,ffffffff833df0d7,90,ffffffff833854de) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8009441458,fffffd806ec72338,4e7afe000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806ec72338,4e7afe000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806ec72300,9cf5fc25000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806ec72300,9cf5fc25000,588f0000,3,20) at pmap_enter+0x386 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_upper_lookup(ffff80003c461d70,ffff80003c461da8,ffff80003c461c70,ffff80003c461cf0) at uvm_fault_upper_lookup+0x337 sys/uvm/uvm_fault.c:-1 uvm_fault(fffffd800b0635b8,9cf5fc26000,0,1) at uvm_fault+0x159 sys/uvm/uvm_fault.c:638 upageflttrap(ffff80003c461f10,9cf5fc26a24) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c461f10) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x74b66a11a130, count: 3 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 144 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ab136) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833ee48c,ffffffff833df0d7,90,ffffffff833854de) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8009441458,fffffd806ec72338,4e7afe000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806ec72338,4e7afe000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806ec72300,9cf5fc25000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806ec72300,9cf5fc25000,588f0000,3,20) at pmap_enter+0x386 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_upper_lookup(ffff80003c461d70,ffff80003c461da8,ffff80003c461c70,ffff80003c461cf0) at uvm_fault_upper_lookup+0x337 sys/uvm/uvm_fault.c:-1 uvm_fault(fffffd800b0635b8,9cf5fc26000,0,1) at uvm_fault+0x159 sys/uvm/uvm_fault.c:638 upageflttrap(ffff80003c461f10,9cf5fc26a24) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c461f10) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x74b66a11a130, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c461890 rbx 0xffff8000299eee07 rdx 0 rcx 0xffff80002a2707e0 rax 0xffff8000299edff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc406826b6b39a5ee r11 0x83caba1f9b0d0013 r12 0xffff8000299eec08 r13 0 r14 0 r15 0x1 rip 0xffffffff81117245 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c461880 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=58685 pid=94881 tcnt=2 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffd230,0xffff80002a270558 process=0xffff8000ffff74f8 user=0xffff80003c45c000, vmspace=0xfffffd800b0635b8 estcpu=36, cpticks=5, pctcpu=0.0, user=4, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 62172 147352 2090 0 2 0 syz-executor *94881 58685 19874 0 7 0 syz-executor 94881 331210 19874 0 3 0x4000080 sbwait syz-executor 69154 209017 43588 0 3 0x80 nanoslp syz-executor 69154 382073 43588 0 3 0x4000080 pppxread syz-executor 69154 317530 43588 0 3 0x4000080 fsleep syz-executor 83921 206394 599 0 3 0x80 nanoslp syz-executor 83921 216666 599 0 3 0x4000080 sbwait syz-executor 67267 371853 2156 0 3 0x80 nanoslp syz-executor 67267 286632 2156 0 3 0x4000080 nanoslp syz-executor 67267 419980 2156 0 3 0x4000080 fsleep syz-executor 14659 212208 28152 0 3 0x80 nanoslp syz-executor 14659 90522 28152 0 3 0x4000080 kqread syz-executor 14659 259821 28152 0 3 0x4000080 fsleep syz-executor 42163 279554 66851 0 3 0x82 nanoslp syz-executor 2090 181748 66851 0 7 0x3 syz-executor 6671 326031 66851 0 3 0x82 wait syz-executor 28152 362253 66851 0 3 0x82 nanoslp syz-executor 59405 193384 1 0 3 0x100083 ttyopn getty 19874 128197 66851 0 3 0x82 nanoslp syz-executor 599 145337 66851 0 3 0x82 nanoslp syz-executor 2156 246806 66851 0 3 0x82 nanoslp syz-executor 1781 422500 21263 0 3 0x100082 sbwait arp 59530 349097 37030 0 3 0x100082 sbwait arp 21263 23466 1 0 3 0x10008a sigsusp sh 37030 107407 1 0 3 0x10008a sigsusp sh 43588 40456 66851 0 3 0x82 nanoslp syz-executor 66851 149402 28060 0 3 0x82 kqread syz-executor 28060 257096 27010 0 3 0x10008a sigsusp ksh 27010 37942 19455 0 3 0x98 kqread sshd-session 19455 32675 69287 0 3 0x92 kqread sshd-session 69287 5600 1 0 3 0x88 kqread sshd 25187 297855 33797 74 3 0x1100092 bpf pflogd 33797 185748 1 0 3 0x80 sbwait pflogd 88104 258797 27391 73 3 0x1100090 kqread syslogd 27391 42078 1 0 3 0x100082 sbwait syslogd 62024 105847 1 0 3 0x100080 kqread resolvd 51532 22874 86482 77 3 0x100092 kqread dhcpleased 34567 475519 86482 77 3 0x100092 kqread dhcpleased 86482 274368 1 0 3 0x80 kqread dhcpleased 89017 335995 0 0 3 0x14200 bored smr 99087 344547 0 0 2 0x14200 zerothread 48710 137364 0 0 3 0x14200 aiodoned aiodoned 58257 339929 0 0 3 0x14200 syncer update 90249 360609 0 0 3 0x14200 cleaner cleaner 64328 305944 0 0 3 0x14200 reaper reaper 77264 49024 0 0 3 0x14200 pgdaemon pagedaemon 55940 498709 0 0 3 0x14200 bored viomb 47208 148434 0 0 3 0x40014200 acpi0 acpi0 96341 54315 0 0 3 0x40014200 idle1 87889 364604 0 0 3 0x14200 bored softnet1 10190 297106 0 0 3 0x14200 bored softnet0 31216 188157 0 0 3 0x14200 bored systqmp 45810 91178 0 0 3 0x14200 bored systq 38059 276164 0 0 3 0x14200 tmoslp softclockmp 47124 182519 0 0 3 0x40014200 tmoslp softclock 64462 124755 0 0 3 0x40014200 idle0 1 169631 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806ec72310) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #3 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2767 #4 uvm_fault_upper_lookup+0x337 sys/uvm/uvm_fault.c:-1 #5 uvm_fault+0x159 sys/uvm/uvm_fault.c:638 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #7 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #8 recall_trap+0x8 Process 94881 (syz-executor) thread 0xffff80002a2707e0 (58685) Process 2090 (syz-executor) thread 0xffff8000fffe82c0 (181748) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10230 11179K 11471K 166960K 13148 0 pcb 17 18K 26K 166960K 388 0 rtable 246 11K 11K 166960K 707 0 pf 37 18K 82K 166960K 203 0 ifaddr 43 8K 8K 166960K 150 0 ifgroup 62 2K 3K 166960K 267 0 sysctl 4 1K 9K 166960K 12 0 counters 72 37K 38K 166960K 256 0 ioctlops 0 0K 4K 166960K 1777 0 iov 1 8K 20K 166960K 73 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1478 93K 93K 166960K 2709 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 18 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 181 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 22 81K 118K 166960K 1520 0 sigio 0 0K 0K 166960K 26 0 proc 72 115K 164K 166960K 854 0 subproc 90 5K 5K 166960K 135 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 322 0 in_multi 96 7K 7K 166960K 198 0 ether_multi 1 0K 0K 166960K 10 0 mrt 1 0K 0K 166960K 19 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 121 546K 546K 166960K 121 0 exec 0 0K 1K 166960K 854 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 283 165K 186K 166960K 15520 0 UVM aobj 33 14K 16K 166960K 39 0 pinsyscall 49 98K 108K 166960K 2841 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 179 0 NDP 13 0K 1K 166960K 105 0 temp 86 8680K 8931K 166960K 70659 0 kqueue 14 22K 32K 166960K 277 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 158 0 152 2 1 1 2 0 8 0 rtentry 176 207 0 109 5 0 5 5 0 8 0 unpcb 144 1002 0 980 13 11 2 4 0 8 1 syncache 336 14 0 14 6 5 1 1 0 8 1 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 747 0 740 16 9 7 7 0 8 6 arp 136 32 0 14 1 0 1 1 0 8 0 inpcb 328 2224 0 2214 26 18 8 12 0 8 6 nd6 152 43 0 19 1 0 1 1 0 8 0 pkpcb 40 14 0 14 4 3 1 1 0 8 1 kcovpl 48 15 0 5 1 0 1 1 0 8 0 mppekey 1024 5 0 5 3 3 0 1 0 8 0 ppxss 1192 63 0 63 2 1 1 1 0 8 1 pppxif 1504 12 0 12 3 3 0 1 0 8 0 pffrag 232 9 0 4 1 0 1 1 0 482 0 pffrnode 88 6 0 2 1 0 1 1 0 8 0 pffrent 40 24 0 19 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 pfrktable 1344 4 0 4 1 1 0 1 0 8 0 pfstitem 24 86 0 43 1 0 1 1 0 8 0 pfstkey 128 86 0 43 2 0 2 2 0 8 0 pfstate 448 86 0 43 6 0 6 6 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 4 0 4 3 3 0 1 0 8 0 art_heap8 4096 5 0 2 5 2 3 5 0 8 0 art_heap4 256 865 0 438 37 7 30 30 0 8 1 art_table 40 870 0 440 5 0 5 5 0 8 0 art_node 32 207 0 119 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 6 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 178 0 168 1 0 1 1 0 8 0 shmpl 112 29 0 3 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 4185 0 2662 96 0 96 96 0 8 0 ffsino 296 4185 0 2662 118 0 118 118 0 8 0 nchpl 144 6228 0 5637 65 42 23 64 0 8 0 rtmask 32 7 0 7 2 1 1 1 0 8 1 vnodes 216 4982 0 0 277 0 277 277 0 8 0 namei 1024 21221 0 21221 2 1 1 1 0 8 1 percpumem 16 143 0 92 1 0 1 1 0 8 0 vcpupl 3968 6 0 2 1 0 1 1 0 8 0 vmpool 840 7 0 3 1 0 1 1 0 8 0 kstatmem 264 162 0 132 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 5 0 5 4 3 1 1 0 8 1 scxspl 216 38998 0 38998 13 12 1 7 1 8 1 plimitpl 152 275 0 255 1 0 1 1 0 8 0 sigapl 424 1833 0 1781 10 3 7 8 0 8 0 knotepl 120 799 0 0 23 0 23 23 0 8 0 kqueuepl 224 694 0 682 15 13 2 5 0 8 0 pipepl 344 276 0 243 6 0 6 6 0 8 3 fdescpl 528 1788 0 1752 3 0 3 3 0 8 0 filepl 160 12043 0 11777 26 10 16 21 0 8 1 lockfpl 104 624 0 621 2 1 1 2 0 8 0 lockfspl 48 271 0 268 1 0 1 1 0 8 0 sessionpl 144 40 0 31 1 0 1 1 0 8 0 pgrppl 48 64 0 45 1 0 1 1 0 8 0 ucredpl 104 1712 0 1698 1 0 1 1 0 8 0 zombiepl 144 1783 0 1781 1 0 1 1 0 8 0 processpl 1232 1833 0 1781 7 2 5 6 0 8 0 procpl 664 4056 0 3996 9 2 7 8 0 8 1 sosppl 176 5 0 5 2 2 0 1 0 8 0 sockpl 752 3468 0 3430 45 33 12 24 0 8 7 mcl64k 65536 4 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 43 0 0 6 0 6 6 0 8 0 mtagpl 96 87 0 0 3 0 3 3 0 8 0 mbufpl 256 1477 0 0 91 0 91 91 0 8 0 bufpl 280 15398 0 9261 439 0 439 439 0 8 0 anonpl 32 14991 0 0 121 0 121 121 0 246 0 amapchunkpl 152 52390 0 51748 55 19 36 36 0 158 9 amappl16 200 5675 0 5604 53 34 19 33 0 8 8 amappl15 192 17 0 16 1 0 1 1 0 8 0 amappl14 184 17 0 16 1 0 1 1 0 8 0 amappl13 176 496 0 493 1 0 1 1 0 8 0 amappl12 168 2211 0 2163 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 62 0 48 1 0 1 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 29 0 25 1 0 1 1 0 8 0 amappl7 128 181 0 179 1 0 1 1 0 8 0 amappl6 120 364 0 347 1 0 1 1 0 8 0 amappl5 112 86 0 75 1 0 1 1 0 8 0 amappl4 104 512 0 477 4 3 1 2 0 8 0 amappl3 96 10249 0 10126 5 1 4 4 0 8 0 amappl2 88 672 0 608 2 0 2 2 0 8 0 amappl1 80 17902 0 17255 17 0 17 17 0 8 0 amappl 88 14400 0 14205 5 0 5 5 0 92 0 uvmvnodes 80 137 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 3 3 0 1 0 8 0 dma64 64 8 0 8 3 3 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 22 0 21 1 0 1 1 0 8 0 aobjpl 72 38 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1788 0 1752 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1788 0 1752 1 0 1 1 0 8 0 vmmpekpl 168 16082 0 16023 3 0 3 3 0 8 0 vmmpepl 168 121815 0 119627 124 4 120 120 0 357 12 vmsppl 488 1787 0 1752 5 0 5 5 0 8 0 rwobjpl 80 34505 0 33252 37 0 37 37 0 8 2 pdppl 4096 3598 0 3514 123 37 86 89 0 8 2 pvpl 32 23642 0 0 192 2 190 190 0 265 0 pmappl 256 1794 0 1755 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 417 0 66 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8385bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839301a0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839301a0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 sys/dev/kcov.c:153 ktrsysret(ffff8000fffe82c0,5b,0,ffff80002a32a490) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffe82c0,5b,0,ffff80002a32a490) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a32a540) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a32a540) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75427038b1e0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff8385bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839301a0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839301a0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 sys/dev/kcov.c:153 ktrsysret(ffff8000fffe82c0,5b,0,ffff80002a32a490) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffe82c0,5b,0,ffff80002a32a490) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a32a540) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a32a540) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75427038b1e0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ab136) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833ee48c,ffffffff833df0d7,90,ffffffff833854de) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8009441458,fffffd806ec72338,4e7afe000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806ec72338,4e7afe000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806ec72300,9cf5fc25000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806ec72300,9cf5fc25000,588f0000,3,20) at pmap_enter+0x386 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_upper_lookup(ffff80003c461d70,ffff80003c461da8,ffff80003c461c70,ffff80003c461cf0) at uvm_fault_upper_lookup+0x337 sys/uvm/uvm_fault.c:-1 uvm_fault(fffffd800b0635b8,9cf5fc26000,0,1) at uvm_fault+0x159 sys/uvm/uvm_fault.c:638 upageflttrap(ffff80003c461f10,9cf5fc26a24) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c461f10) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x74b66a11a130, count: 3 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ab136) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833ee48c,ffffffff833df0d7,90,ffffffff833854de) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8009441458,fffffd806ec72338,4e7afe000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806ec72338,4e7afe000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806ec72300,9cf5fc25000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806ec72300,9cf5fc25000,588f0000,3,20) at pmap_enter+0x386 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_upper_lookup(ffff80003c461d70,ffff80003c461da8,ffff80003c461c70,ffff80003c461cf0) at uvm_fault_upper_lookup+0x337 sys/uvm/uvm_fault.c:-1 uvm_fault(fffffd800b0635b8,9cf5fc26000,0,1) at uvm_fault+0x159 sys/uvm/uvm_fault.c:638 upageflttrap(ffff80003c461f10,9cf5fc26a24) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c461f10) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x74b66a11a130, count: -12