panic: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 144 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *395193 87857 0 0x2 0 0 syz-executor.6 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8254b767) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825be0c8,ffffffff82571a1d,90,ffffffff825260d2) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pagealloc_pg(fffffd8006334480,fffffd80753e1df0,1fdff000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline] uvm_pagealloc_pg(fffffd8006334480,fffffd80753e1df0,1fdff000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:710 uvm_pagealloc(fffffd80753e1df0,1fdff000,0,3) at uvm_pagealloc+0x1e8 sys/uvm/uvm_page.c:918 pmap_get_ptp(fffffd80753e1dc0,7f7fffff7000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1183 pmap_enter(fffffd80753e1dc0,7f7fffff7000,72885000,3,20) at pmap_enter+0x2a0 uvm_fault_upper_lookup(ffff800026503d80,ffff800026503db8,ffff800026503c80,ffff800026503d00) at uvm_fault_upper_lookup+0x291 sys/uvm/uvm_fault.c:887 uvm_fault(fffffd80785e1228,7f7fffff8000,0,1) at uvm_fault+0x119 sys/uvm/uvm_fault.c:607 upageflttrap(ffff800026503ef0,7f7fffff8f28) at upageflttrap+0x79 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800026503ef0) at usertrap+0x198 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff8f40, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 144 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8254b767) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825be0c8,ffffffff82571a1d,90,ffffffff825260d2) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pagealloc_pg(fffffd8006334480,fffffd80753e1df0,1fdff000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline] uvm_pagealloc_pg(fffffd8006334480,fffffd80753e1df0,1fdff000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:710 uvm_pagealloc(fffffd80753e1df0,1fdff000,0,3) at uvm_pagealloc+0x1e8 sys/uvm/uvm_page.c:918 pmap_get_ptp(fffffd80753e1dc0,7f7fffff7000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1183 pmap_enter(fffffd80753e1dc0,7f7fffff7000,72885000,3,20) at pmap_enter+0x2a0 uvm_fault_upper_lookup(ffff800026503d80,ffff800026503db8,ffff800026503c80,ffff800026503d00) at uvm_fault_upper_lookup+0x291 sys/uvm/uvm_fault.c:887 uvm_fault(fffffd80785e1228,7f7fffff8000,0,1) at uvm_fault+0x119 sys/uvm/uvm_fault.c:607 upageflttrap(ffff800026503ef0,7f7fffff8f28) at upageflttrap+0x79 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800026503ef0) at usertrap+0x198 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff8f40, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000265038a0 rbx 0 rdx 0 rcx 0 rax 0xffff8000230b82b0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xfd2f38e9337b6aff r11 0x89a9c913f2969c63 r12 0 r13 0x1fdff000 r14 0 r15 0x1 rip 0xffffffff81100918 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800026503890 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.6) pid=395193 stat=onproc flags process=2 proc=0 pri=84, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000230b87f0,0xffff80002166ed38 process=0xffff8000216aa418 user=0xffff8000264fe000, vmspace=0xfffffd80785e1228 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 79663 271671 85776 0 2 0 syz-executor.5 66258 20668 46298 0 2 0 syz-executor.7 66258 358549 46298 0 3 0x4000080 fsleep syz-executor.7 98910 407616 18160 0 2 0 syz-executor.2 98910 421651 18160 0 3 0x4000080 fsleep syz-executor.2 91879 22243 20985 0 2 0 syz-executor.1 91879 47171 20985 0 3 0x4000080 fsleep syz-executor.1 91879 444598 20985 0 2 0x4000000 syz-executor.1 91879 95179 20985 0 2 0x4000000 syz-executor.1 24037 496752 76601 0 3 0x80 nanoslp syz-executor.4 24037 344239 76601 0 2 0x4000000 syz-executor.4 24037 395877 76601 0 3 0x4000080 fsleep syz-executor.4 24037 372284 76601 0 3 0x4000080 fsleep syz-executor.4 18160 283388 68278 0 3 0x82 nanoslp syz-executor.2 *87857 395193 68278 0 7 0x2 syz-executor.6 39435 449280 68278 0 2 0x2 syz-executor.3 39713 33022 0 0 3 0x14200 acct acct 76601 259705 68278 0 3 0x82 nanoslp syz-executor.4 85776 19051 68278 0 3 0x82 nanoslp syz-executor.5 83459 213091 68278 0 3 0x2 biowait syz-executor.0 69394 476339 0 0 3 0x14280 nfsidl nfsio 63518 346130 0 0 3 0x14280 nfsidl nfsio 95313 224538 0 0 3 0x14280 nfsidl nfsio 94121 158126 0 0 3 0x14280 nfsidl nfsio 58708 168775 0 0 3 0x14280 nfsidl nfsio 25044 258720 0 0 3 0x14280 nfsidl nfsio 27010 10090 0 0 3 0x14280 nfsidl nfsio 95385 508255 0 0 3 0x14280 nfsidl nfsio 39727 94442 0 0 3 0x14280 nfsidl nfsio 4759 247655 0 0 3 0x14280 nfsidl nfsio 70224 491490 0 0 3 0x14280 nfsidl nfsio 4651 22004 0 0 3 0x14280 nfsidl nfsio 82237 108912 0 0 3 0x14280 nfsidl nfsio 73225 122541 0 0 3 0x14280 nfsidl nfsio 11810 21766 0 0 3 0x14280 nfsidl nfsio 12491 69674 0 0 3 0x14280 nfsidl nfsio 82173 376537 0 0 3 0x14280 nfsidl nfsio 14051 186277 0 0 3 0x14280 nfsidl nfsio 39234 315381 0 0 3 0x14280 nfsidl nfsio 24896 135419 0 0 3 0x14280 nfsidl nfsio 46298 81318 68278 0 2 0x2 syz-executor.7 20985 119179 68278 0 3 0x82 nanoslp syz-executor.1 33119 450220 0 0 3 0x14200 bored sosplice 68278 311219 76035 0 3 0x82 kqread syz-fuzzer 68278 421571 76035 0 3 0x4000082 nanoslp syz-fuzzer 68278 480245 76035 0 3 0x4000082 thrsleep syz-fuzzer 68278 67076 76035 0 3 0x4000082 thrsleep syz-fuzzer 68278 52873 76035 0 3 0x4000082 thrsleep syz-fuzzer 68278 140050 76035 0 3 0x4000082 thrsleep syz-fuzzer 68278 88140 76035 0 3 0x4000082 thrsleep syz-fuzzer 68278 244582 76035 0 3 0x4000082 thrsleep syz-fuzzer 76035 497678 36242 0 3 0x10008a sigsusp ksh 36242 465308 19616 0 3 0x9a kqread sshd 22052 348637 1 0 3 0x100083 ttyopn getty 19616 391955 1 0 3 0x88 kqread sshd 93660 432378 64165 73 3 0x1100090 kqread syslogd 64165 289603 1 0 3 0x100082 netio syslogd 93458 4013 1 0 3 0x100080 kqread resolvd 35797 164523 14761 77 3 0x100092 kqread dhcpleased 92283 271693 14761 77 3 0x100092 kqread dhcpleased 14761 467174 1 0 3 0x80 kqread dhcpleased 244 518782 0 0 3 0x14200 bored smr 65125 269100 0 0 2 0x14200 zerothread 66917 94220 0 0 3 0x14200 aiodoned aiodoned 97381 374993 0 0 3 0x14200 syncer update 5934 4889 0 0 3 0x14200 cleaner cleaner 29051 22826 0 0 3 0x14200 reaper reaper 13501 395735 0 0 3 0x14200 pgdaemon pagedaemon 42152 420704 0 0 3 0x14200 bored viomb 22088 347658 0 0 3 0x40014200 acpi0 acpi0 17541 151291 0 0 3 0x14200 bored softnet 81159 190873 0 0 3 0x14200 bored systqmp 13725 196851 0 0 3 0x14200 bored systq 31272 226228 0 0 3 0x40014200 bored softclock 95197 255979 0 0 3 0x40014200 idle0 1 420496 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10208 6681K 7446K 78643K 53423 0 pcb 13 16K 19K 78643K 1399 0 rtable 216 13K 17K 78643K 3852 0 ifaddr 93 23K 26K 78643K 4285 0 sysctl 2 0K 0K 78643K 2 0 counters 26 17K 17K 78643K 197 0 ioctlops 0 0K 4K 78643K 4407 0 iov 0 0K 28K 78643K 1232 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1409 88K 88K 78643K 12842 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 69 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 952 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 85K 78643K 13635 0 sigio 0 0K 0K 78643K 67 0 proc 58 55K 79K 78643K 2846 0 subproc 104 6K 6K 78643K 1079 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 249 0 in_multi 77 5K 6K 78643K 1148 0 ether_multi 1 0K 0K 78643K 83 0 mrt 1 0K 0K 78643K 31 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 187 837K 837K 78643K 187 0 exec 0 0K 2K 78643K 3429 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 406 467K 918K 78643K 162248 0 UVM aobj 131 8K 8K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 367 0 NDP 12 0K 2K 78643K 354 0 temp 147 4733K 4989K 78643K 110475 0 kqueue 12 18K 26K 78643K 788 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 769 0 766 11 10 1 3 0 8 0 rtentry 112 1009 0 928 5 2 3 4 0 8 0 unpcb 136 8432 0 8419 75 74 1 9 0 8 0 syncache 296 25 0 25 9 9 0 1 0 8 0 tcpqe 32 121 0 121 3 3 0 1 0 8 0 tcpcb 736 2039 0 2035 73 72 1 8 0 8 0 arp 88 181 0 167 1 0 1 1 0 8 0 ipq 40 7 0 7 4 4 0 1 0 8 0 ipqe 40 30 0 30 4 4 0 1 0 8 0 inpcb 304 8064 0 8057 141 140 1 11 0 8 0 rttmr 72 9 0 9 2 2 0 1 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 4 0 4 1 1 0 1 0 8 0 nd6 48 264 0 246 1 0 1 1 0 8 0 pkpcb 40 18 0 18 5 5 0 1 0 8 0 kcovpl 48 83 0 75 1 0 1 1 0 8 0 ppxss 1152 36 0 36 7 7 0 1 0 8 0 pfstscr 40 79 0 79 1 1 0 1 0 8 0 pfosfp 40 74 0 73 2 1 1 1 0 8 0 pfosfpen 112 74 0 73 4 3 1 3 0 8 0 pfrktable 1344 428 0 416 5 3 2 2 0 8 0 pftag 88 18 0 7 1 0 1 1 0 8 0 pfqueue 264 9 0 5 1 0 1 1 0 8 0 pfstitem 24 2 0 2 1 1 0 1 0 8 0 pfstkey 112 148 0 148 2 2 0 1 0 8 0 pfstate 320 74 0 74 2 2 0 1 0 8 0 pfrule 1360 2783 0 2651 16 4 12 12 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 4108 0 3744 61 33 28 30 0 8 0 art_table 32 4110 0 3745 5 1 4 4 0 8 0 art_node 16 1008 0 938 1 0 1 1 0 8 0 sysvmsgpl 40 59 0 19 2 1 1 1 0 8 0 semapl 112 950 0 940 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 18304 0 16849 92 0 92 92 0 8 0 ffsino 240 18304 0 16849 86 0 86 86 0 8 0 nchpl 144 36746 0 35119 63 1 62 63 0 8 0 uvmvnodes 80 6223 0 0 127 0 127 127 0 8 0 vnodes 224 6223 0 0 367 0 367 367 0 8 0 namei 1024 136218 0 136217 9 8 1 2 0 8 0 vcpupl 1984 97 0 3 12 0 12 12 0 8 0 vmpool 528 130 0 36 8 1 7 7 0 8 0 pfiaddrpl 120 142 0 126 1 0 1 1 0 8 0 scsiplug 72 4 0 4 1 1 0 1 0 8 0 scxspl 216 114669 0 114668 23 22 1 8 0 8 0 plimitpl 152 1027 0 1013 1 0 1 1 0 8 0 sigapl 424 13781 0 13720 9 1 8 8 0 8 0 futexpl 64 147128 0 147123 7 6 1 1 0 8 0 knotepl 120 131566 0 131486 20 17 3 10 0 8 0 kqueuepl 184 16046 0 16036 144 141 3 12 0 8 2 pipepl 304 2187 0 2159 47 44 3 10 0 8 0 fdescpl 432 13745 0 13719 9 5 4 4 0 8 0 filepl 120 103192 0 102946 159 149 10 17 0 8 2 lockfpl 104 4809 0 4806 14 12 2 2 0 8 1 lockfspl 48 1049 0 1046 1 0 1 1 0 8 0 sessionpl 144 98 0 82 1 0 1 1 0 8 0 pgrppl 48 119 0 103 1 0 1 1 0 8 0 ucredpl 96 10797 0 10784 1 0 1 1 0 8 0 zombiepl 144 13720 0 13720 2 1 1 1 0 8 1 processpl 1000 13781 0 13720 10 1 9 9 0 8 0 procpl 672 33288 0 33212 33 25 8 8 0 8 0 sosppl 168 29 0 29 7 7 0 1 0 8 0 sockpl 448 17294 0 17271 386 382 4 30 0 8 1 mcl64k 65536 572 0 572 39 38 1 1 0 8 1 mcl16k 16384 334 0 334 32 31 1 1 0 8 1 mcl12k 12288 454 0 454 32 31 1 1 0 8 1 mcl9k 9216 145 0 145 36 35 1 1 0 8 1 mcl8k 8192 643 0 643 36 35 1 1 0 8 1 mcl4k 4096 2975 0 2975 13 12 1 1 0 8 1 mcl2k2 2112 57 0 57 27 27 0 1 0 8 0 mcl2k 2048 101030 0 100986 42 35 7 13 0 8 1 mtagpl 96 6129 0 5580 26 6 20 20 0 8 0 mbufpl 256 260879 0 260124 313 250 63 195 0 8 0 bufpl 288 25945 0 19537 458 0 458 458 0 8 0 anonpl 24 4760594 0 4741173 379 244 135 196 0 188 0 amapchunkpl 152 448986 0 448224 741 707 34 659 0 158 1 amappl16 200 100458 0 99686 187 144 43 56 0 8 0 amappl15 192 2669 0 2663 1 0 1 1 0 8 0 amappl14 184 805 0 803 1 0 1 1 0 8 0 amappl13 176 2974 0 2971 1 0 1 1 0 8 0 amappl12 168 934 0 934 6 6 0 1 0 8 0 amappl11 160 2878 0 2863 1 0 1 1 0 8 0 amappl10 152 1138 0 1132 1 0 1 1 0 8 0 amappl9 144 790 0 787 1 0 1 1 0 8 0 amappl8 136 4458 0 4364 4 0 4 4 0 8 0 amappl7 128 3002 0 2990 1 0 1 1 0 8 0 amappl6 120 733 0 711 2 1 1 2 0 8 0 amappl5 112 10970 0 10956 1 0 1 1 0 8 0 amappl4 104 8013 0 7975 2 0 2 2 0 8 0 amappl3 96 3000 0 2986 1 0 1 1 0 8 0 amappl2 88 4535 0 4485 3 1 2 3 0 8 0 amappl1 80 243720 0 243182 23 10 13 18 0 8 0 amappl 88 160526 0 160273 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 13875 0 13755 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 13875 0 13755 1 0 1 1 0 8 0 vmmpekpl 168 91521 0 91448 4 0 4 4 0 8 0 vmmpepl 168 1331281 0 1328506 416 280 136 167 0 357 3 vmsppl 272 13874 0 13755 11 2 9 9 0 8 0 rwobjpl 24 358778 0 350679 51 1 50 50 0 8 0 pdppl 4096 27756 0 27604 874 717 157 159 0 8 5 pvpl 32 8414323 0 8390773 597 376 221 337 0 265 0 pmappl 216 13874 0 13755 9 2 7 7 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 2549 0 1622 30 3 27 28 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8254b767) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825be0c8,ffffffff82571a1d,90,ffffffff825260d2) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pagealloc_pg(fffffd8006334480,fffffd80753e1df0,1fdff000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline] uvm_pagealloc_pg(fffffd8006334480,fffffd80753e1df0,1fdff000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:710 uvm_pagealloc(fffffd80753e1df0,1fdff000,0,3) at uvm_pagealloc+0x1e8 sys/uvm/uvm_page.c:918 pmap_get_ptp(fffffd80753e1dc0,7f7fffff7000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1183 pmap_enter(fffffd80753e1dc0,7f7fffff7000,72885000,3,20) at pmap_enter+0x2a0 uvm_fault_upper_lookup(ffff800026503d80,ffff800026503db8,ffff800026503c80,ffff800026503d00) at uvm_fault_upper_lookup+0x291 sys/uvm/uvm_fault.c:887 uvm_fault(fffffd80785e1228,7f7fffff8000,0,1) at uvm_fault+0x119 sys/uvm/uvm_fault.c:607 upageflttrap(ffff800026503ef0,7f7fffff8f28) at upageflttrap+0x79 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800026503ef0) at usertrap+0x198 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff8f40, count: -12 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8254b767) at panic+0x161 sys/kern/subr_prf.c:202 __assert(ffffffff825be0c8,ffffffff82571a1d,90,ffffffff825260d2) at __assert+0x25 sys/kern/subr_prf.c:161 uvm_pagealloc_pg(fffffd8006334480,fffffd80753e1df0,1fdff000,0) at uvm_pagealloc_pg+0x427 uvm_pageinsert sys/uvm/uvm_page.c:138 [inline] uvm_pagealloc_pg(fffffd8006334480,fffffd80753e1df0,1fdff000,0) at uvm_pagealloc_pg+0x427 sys/uvm/uvm_page.c:710 uvm_pagealloc(fffffd80753e1df0,1fdff000,0,3) at uvm_pagealloc+0x1e8 sys/uvm/uvm_page.c:918 pmap_get_ptp(fffffd80753e1dc0,7f7fffff7000) at pmap_get_ptp+0x18d sys/arch/amd64/amd64/pmap.c:1183 pmap_enter(fffffd80753e1dc0,7f7fffff7000,72885000,3,20) at pmap_enter+0x2a0 uvm_fault_upper_lookup(ffff800026503d80,ffff800026503db8,ffff800026503c80,ffff800026503d00) at uvm_fault_upper_lookup+0x291 sys/uvm/uvm_fault.c:887 uvm_fault(fffffd80785e1228,7f7fffff8000,0,1) at uvm_fault+0x119 sys/uvm/uvm_fault.c:607 upageflttrap(ffff800026503ef0,7f7fffff8f28) at upageflttrap+0x79 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800026503ef0) at usertrap+0x198 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff8f40, count: -12