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 *166586 9728 0 0x18000002 0 0 getty 17775 13700 0 0x14000 0x200 1 softclockmp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830daea6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83091e03,ffffffff8303275f,90,ffffffff8309295e) at __assert+0x29 uvm_pagealloc_pg(fffffd80078dd0a0,fffffd806e0658f0,796858000,0) at uvm_pagealloc_pg+0x521 sys/uvm/uvm_page.c:695 uvm_pagealloc(fffffd806e0658f0,796858000,0,3) at uvm_pagealloc+0x23e sys/uvm/uvm_page.c:912 pmap_get_ptp(fffffd806e0658c0,f2d0b0ef000) at pmap_get_ptp+0x1c6 pmap_enter(fffffd806e0658c0,f2d0b0ef000,6edfd000,4,20) at pmap_enter+0x389 uvm_fault_lower_lookup(ffff8000371dd440,ffff8000371dd478,ffff8000371dd3c0) at uvm_fault_lower_lookup+0x33c sys/uvm/uvm_fault.c:1192 uvm_fault_lower(ffff8000371dd440,ffff8000371dd478,ffff8000371dd3c0,0) at uvm_fault_lower+0x74 sys/uvm/uvm_fault.c:1227 uvm_fault(fffffd807286edd0,f2d0b0f2000,0,4) at uvm_fault+0x301 sys/uvm/uvm_fault.c:637 upageflttrap(ffff8000371dd5c0,f2d0b0f283b) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000371dd5c0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7e6a93b26dc0, count: 2 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: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 144 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830daea6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83091e03,ffffffff8303275f,90,ffffffff8309295e) at __assert+0x29 uvm_pagealloc_pg(fffffd80078dd0a0,fffffd806e0658f0,796858000,0) at uvm_pagealloc_pg+0x521 sys/uvm/uvm_page.c:695 uvm_pagealloc(fffffd806e0658f0,796858000,0,3) at uvm_pagealloc+0x23e sys/uvm/uvm_page.c:912 pmap_get_ptp(fffffd806e0658c0,f2d0b0ef000) at pmap_get_ptp+0x1c6 pmap_enter(fffffd806e0658c0,f2d0b0ef000,6edfd000,4,20) at pmap_enter+0x389 uvm_fault_lower_lookup(ffff8000371dd440,ffff8000371dd478,ffff8000371dd3c0) at uvm_fault_lower_lookup+0x33c sys/uvm/uvm_fault.c:1192 uvm_fault_lower(ffff8000371dd440,ffff8000371dd478,ffff8000371dd3c0,0) at uvm_fault_lower+0x74 sys/uvm/uvm_fault.c:1227 uvm_fault(fffffd807286edd0,f2d0b0f2000,0,4) at uvm_fault+0x301 sys/uvm/uvm_fault.c:637 upageflttrap(ffff8000371dd5c0,f2d0b0f283b) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000371dd5c0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7e6a93b26dc0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000371dcec0 rbx 0xffffffff8342ad87 cpu_info_full_primary+0x2d87 rdx 0 rcx 0xffff8000ffff1990 rax 0xffffffff83429ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa9eaae4d755955c2 r11 0x89c73bbc28070bb8 r12 0xffffffff8342ab88 cpu_info_full_primary+0x2b88 r13 0 r14 0 r15 0x1 rip 0xffffffff8244f685 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000371dceb0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (getty) tid=166586 pid=9728 tcnt=1 stat=onproc flags process=18000002 proc=0 runpri=32, usrpri=61, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a03f458,0xffff8000ffff07e8 process=0xffff800029fe8908 user=0xffff8000371d8000, vmspace=0xfffffd807286edd0 estcpu=11, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18169 97432 48022 0 2 0x8000010 syz-executor 18169 212492 48022 0 2 0xc000090 syz-executor 73730 258652 34378 0 2 0x8000000 syz-executor 73730 99034 34378 0 3 0xc000080 netcon syz-executor 73730 323550 34378 0 2 0xc000000 syz-executor 34076 274287 68736 0 2 0x8000480 syz-executor 34076 258065 68736 0 2 0xc000480 syz-executor 34076 345231 68736 0 3 0xc000080 fsleep syz-executor 62084 340504 59351 0 2 0x8000480 syz-executor 62084 173211 59351 0 3 0xc000080 msgwait syz-executor 33116 23766 82136 0 2 0x8000480 syz-executor 33116 184145 82136 0 3 0xc000080 lockf syz-executor 33116 446061 82136 0 3 0xc000080 fsleep syz-executor 33116 54569 82136 0 3 0xc000080 fsleep syz-executor * 9728 166586 1 0 7 0x18000002 getty 19328 396418 16042 0 2 0x8000482 syz-executor 7342 138613 16042 0 2 0x8000002 syz-executor 48022 432347 16042 0 2 0x8000482 syz-executor 59351 219762 16042 0 2 0x8000482 syz-executor 34378 96320 16042 0 2 0x8000482 syz-executor 82136 504327 16042 0 2 0x8000482 syz-executor 68736 451831 16042 0 2 0x8000482 syz-executor 2637 375741 16042 0 2 0x8000482 syz-executor 30414 345070 0 0 3 0x14200 bored sosplice 16042 376920 36677 0 2 0x8000482 syz-executor 36677 427941 48620 0 3 0x810008a sigsusp ksh 48620 115410 14362 0 3 0x18000098 kqread sshd-session 14362 77821 20881 0 3 0x18000092 kqread sshd-session 20881 221920 1 0 3 0x18000088 kqread sshd 74028 386554 15091 74 2 0x19100092 pflogd 15091 429639 1 0 3 0x18000080 sbwait pflogd 28364 309174 444 73 2 0x19100090 syslogd 444 297694 1 0 3 0x18100082 sbwait syslogd 84479 495802 1 0 3 0x18100080 kqread resolvd 30462 267168 61294 77 3 0x18100092 kqread dhcpleased 7756 273772 61294 77 3 0x18100092 kqread dhcpleased 61294 267062 1 0 3 0x18000080 kqread dhcpleased 93430 461168 0 0 3 0x14200 bored smr 1139 124626 0 0 3 0x14200 pgzero zerothread 54729 361733 0 0 3 0x14200 aiodoned aiodoned 70997 311777 0 0 2 0x14600 update 48610 491615 0 0 3 0x14200 cleaner cleaner 80929 30338 0 0 2 0x14200 reaper 50404 58652 0 0 3 0x14200 pgdaemon pagedaemon 45394 338175 0 0 3 0x14200 bored viomb 3381 35952 0 0 3 0x40014200 acpi0 acpi0 28677 523240 0 0 3 0x40014200 idle1 66511 17388 0 0 3 0x14200 bored softnet3 89939 440583 0 0 3 0x14200 bored softnet2 65532 241790 0 0 3 0x14200 bored softnet1 17578 351719 0 0 2 0x14200 softnet0 86062 474170 0 0 3 0x14200 bored systqmp 31712 332361 0 0 3 0x14200 bored systq 13700 17775 0 0 7 0x14200 softclockmp 57679 457488 0 0 3 0x40014200 tmoslp softclock 35097 482323 0 0 3 0x40014200 idle0 1 197513 0 0 3 0x8080082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806e0658d0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pmap_enter+0x246 rcr3 machine/cpufunc.h:139 [inline] #3 pmap_enter+0x246 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:430 [inline] #3 pmap_enter+0x246 sys/arch/amd64/amd64/pmap.c:2755 #4 uvm_fault_lower_lookup+0x33c sys/uvm/uvm_fault.c:1192 #5 uvm_fault_lower+0x74 sys/uvm/uvm_fault.c:1227 #6 uvm_fault+0x301 sys/uvm/uvm_fault.c:637 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 CPU 1: exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd8007e22218) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pmap_remove_ptes+0x297 sys/arch/amd64/amd64/pmap.c:1704 #4 pmap_do_remove+0x533 sys/arch/amd64/amd64/pmap.c:1911 #5 uvm_unmap_kill_entry_withlock+0x274 sys/uvm/uvm_map.c:1865 #6 uvm_map_teardown+0x1c7 sys/uvm/uvm_map.c:2498 #7 uvmspace_free+0xcd sys/uvm/uvm_map.c:3422 #8 reaper+0x256 sys/kern/kern_exit.c:480 #9 proc_trampoline+0x10 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806e065cb0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pmap_do_remove+0xa9 rcr3 machine/cpufunc.h:139 [inline] #3 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:430 [inline] #3 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1815 #4 uvm_unmap_kill_entry_withlock+0x274 sys/uvm/uvm_map.c:1865 #5 uvm_map_teardown+0x1c7 sys/uvm/uvm_map.c:2498 #6 uvmspace_free+0xcd sys/uvm/uvm_map.c:3422 #7 reaper+0x256 sys/kern/kern_exit.c:480 #8 proc_trampoline+0x10 Process 9728 (getty) thread 0xffff8000ffff1990 (166586) Process 7342 (syz-executor) thread 0xffff8000ffff3970 (138613) Process 80929 (reaper) thread 0xffff800029fd8cb0 (30338) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10211 10307K 10622K 166960K 12465 0 pcb 17 12K 12K 166960K 197 0 rtable 208 10K 11K 166960K 747 0 pf 39 18K 26K 166960K 190 0 ifaddr 41 7K 7K 166960K 109 0 ifgroup 59 2K 3K 166960K 152 0 sysctl 4 1K 1K 166960K 6 0 counters 66 36K 37K 166960K 126 0 ioctlops 0 0K 4K 166960K 1624 0 iov 0 0K 24K 166960K 59 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1360 86K 86K 166960K 2309 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 22 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 55 0 dirhash 12 2K 3K 166960K 66 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 16 57K 89K 166960K 1868 0 sigio 0 0K 0K 166960K 27 0 proc 70 91K 128K 166960K 837 0 subproc 104 6K 6K 166960K 211 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 174 0 in_multi 79 5K 7K 166960K 261 0 ether_multi 1 0K 0K 166960K 25 0 mrt 1 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 604 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 259 108K 108K 166960K 17160 0 UVM aobj 23 6K 6K 166960K 24 0 pinsyscall 41 82K 105K 166960K 3167 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 82 0 NDP 13 0K 2K 166960K 75 0 temp 60 6816K 6943K 166960K 46736 0 kqueue 13 20K 31K 166960K 208 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 135 0 132 1 0 1 1 0 8 0 rtentry 112 235 0 148 4 1 3 4 0 8 0 unpcb 144 681 0 661 4 2 2 2 0 8 1 syncache 336 8 0 8 2 2 0 1 0 8 0 tcpqe 32 8 3 8 1 1 0 1 0 8 0 tcpcb 808 342 0 333 4 2 2 2 0 8 1 arp 120 46 0 29 1 0 1 1 0 8 0 inpcb 336 1190 0 1174 2 0 2 2 0 8 0 nd6 136 55 0 33 1 0 1 1 0 8 0 pkpcb 40 9 0 9 2 2 0 1 0 8 0 kcovpl 48 16 0 8 1 0 1 1 0 8 0 ppxss 1168 18 0 18 2 2 0 1 0 8 0 pfstscr 40 5 0 4 1 0 1 1 0 8 0 pffrag 232 17 0 2 1 0 1 1 0 482 0 pffrnode 88 15 0 2 1 0 1 1 0 8 0 pffrent 40 64 0 49 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 7 0 4 1 0 1 1 0 8 0 pfanchor 1288 10 0 2 1 0 1 1 0 8 0 pftag 88 5 0 4 2 1 1 1 0 8 0 pfstitem 24 136 0 32 1 0 1 1 0 8 0 pfstkey 128 146 0 43 4 0 4 4 0 8 0 pfstate 376 138 0 36 11 0 11 11 0 8 0 pfrule 1344 41 0 32 2 1 1 2 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 866 0 526 29 6 23 29 0 8 0 art_table 32 868 0 527 4 0 4 4 0 8 0 art_node 16 233 0 158 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 4 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 53 0 43 1 0 1 1 0 8 0 shmpl 112 21 0 1 1 0 1 1 0 8 0 dirhash 1024 54 0 37 3 0 3 3 0 8 0 dino2pl 256 4182 0 2669 96 0 96 96 0 8 0 ffsino 272 4182 0 2669 102 0 102 102 0 8 0 nchpl 144 6381 0 4688 63 0 63 63 0 8 0 uvmvnodes 80 4876 0 0 100 0 100 100 0 8 0 vnodes 216 4876 0 0 271 0 271 271 0 8 0 namei 1024 19153 0 19152 3 2 1 1 0 8 0 percpumem 16 77 0 30 1 0 1 1 0 8 0 vcpupl 3904 6 0 1 1 0 1 1 0 8 0 vmpool 696 7 0 2 1 0 1 1 0 8 0 pfiaddrpl 120 3 0 1 1 0 1 1 0 8 0 kstatmem 264 86 0 60 4 2 2 3 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 23842 0 23842 12 11 1 8 1 8 1 plimitpl 152 192 0 173 1 0 1 1 0 8 0 sigapl 424 2179 0 2129 10 3 7 9 0 8 0 futexpl 64 19059 0 19056 2 1 1 1 0 8 0 knotepl 120 564 0 0 18 0 18 18 0 8 0 kqueuepl 216 300 0 290 1 0 1 1 0 8 0 pipepl 320 208 0 181 4 1 3 4 0 8 0 fdescpl 496 2138 0 2108 6 1 5 5 0 8 0 filepl 152 8686 0 8424 12 1 11 11 0 8 0 lockfpl 104 348 0 343 1 0 1 1 0 8 0 lockfspl 48 149 0 145 1 0 1 1 0 8 0 sessionpl 144 32 0 24 1 0 1 1 0 8 0 pgrppl 48 56 0 40 1 0 1 1 0 8 0 ucredpl 104 1520 0 1506 1 0 1 1 0 8 0 zombiepl 144 2131 0 2129 3 2 1 1 0 8 0 processpl 1152 2179 0 2129 7 2 5 6 0 8 1 procpl 648 3980 0 3921 9 3 6 8 0 8 0 srpgc 96 14 0 14 3 3 0 1 0 8 0 sosppl 168 26 0 26 3 3 0 1 0 8 0 sockpl 664 2022 0 1984 7 3 4 5 0 8 0 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 21 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 14 0 0 2 0 2 2 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 206 0 0 26 0 26 26 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 323 0 0 21 0 21 21 0 8 0 bufpl 280 8796 0 2624 442 0 442 442 0 8 1 anonpl 24 349699 0 336860 93 12 81 81 0 185 0 amapchunkpl 152 57083 0 56237 58 23 35 35 0 158 0 amappl16 200 8943 0 8688 53 26 27 31 0 8 0 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 133 0 121 1 0 1 1 0 8 0 amappl13 176 15 0 15 3 3 0 1 0 8 0 amappl12 168 2920 0 2889 3 1 2 2 0 8 0 amappl11 160 60 0 46 1 0 1 1 0 8 0 amappl10 152 12 0 12 1 1 0 1 0 8 0 amappl9 144 206 0 206 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 120 0 108 1 0 1 1 0 8 0 amappl6 120 246 0 245 1 0 1 1 0 8 0 amappl5 112 184 0 172 1 0 1 1 0 8 0 amappl4 104 367 0 348 1 0 1 1 0 8 0 amappl3 96 11932 0 11805 4 0 4 4 0 8 0 amappl2 88 757 0 693 2 0 2 2 0 8 0 amappl1 80 13565 0 12980 14 1 13 14 0 8 0 amappl 88 16625 0 16434 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 8 0 8 2 2 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 21 0 20 1 0 1 1 0 8 0 aobjpl 72 23 0 1 1 0 1 1 0 8 0 uaddrrnd 24 2145 0 2110 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2145 0 2110 1 0 1 1 0 8 0 vmmpekpl 168 13642 0 13588 3 0 3 3 0 8 0 vmmpepl 168 134046 0 131902 121 16 105 108 0 357 3 vmsppl 440 2144 0 2109 7 2 5 5 0 8 0 rwobjpl 56 40438 0 34342 91 3 88 88 0 8 1 pdppl 4096 4297 0 4223 121 45 76 83 0 8 2 pvpl 32 34551 0 0 279 1 278 278 0 265 0 pmappl 248 2144 0 2109 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 431 0 67 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830daea6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83091e03,ffffffff8303275f,90,ffffffff8309295e) at __assert+0x29 uvm_pagealloc_pg(fffffd80078dd0a0,fffffd806e0658f0,796858000,0) at uvm_pagealloc_pg+0x521 sys/uvm/uvm_page.c:695 uvm_pagealloc(fffffd806e0658f0,796858000,0,3) at uvm_pagealloc+0x23e sys/uvm/uvm_page.c:912 pmap_get_ptp(fffffd806e0658c0,f2d0b0ef000) at pmap_get_ptp+0x1c6 pmap_enter(fffffd806e0658c0,f2d0b0ef000,6edfd000,4,20) at pmap_enter+0x389 uvm_fault_lower_lookup(ffff8000371dd440,ffff8000371dd478,ffff8000371dd3c0) at uvm_fault_lower_lookup+0x33c sys/uvm/uvm_fault.c:1192 uvm_fault_lower(ffff8000371dd440,ffff8000371dd478,ffff8000371dd3c0,0) at uvm_fault_lower+0x74 sys/uvm/uvm_fault.c:1227 uvm_fault(fffffd807286edd0,f2d0b0f2000,0,4) at uvm_fault+0x301 sys/uvm/uvm_fault.c:637 upageflttrap(ffff8000371dd5c0,f2d0b0f283b) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000371dd5c0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7e6a93b26dc0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 mtx_enter(ffffffff8351e2f0) at mtx_enter softclock_thread_mp(ffff8000ffffea20) at softclock_thread_mp+0xaf sys/kern/kern_timeout.c:837 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 mtx_enter(ffffffff8351e2f0) at mtx_enter softclock_thread_mp(ffff8000ffffea20) at softclock_thread_mp+0xaf sys/kern/kern_timeout.c:837 end trace frame: 0x0, count: -5