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 * 91952 79912 0 0 0 1 syz-executor 433192 64 0 0 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83451c58) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ceed,ffffffff8347bea1,90,ffffffff834242f6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8008170870,fffffd806c819238,d97f000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806c819238,d97f000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806c819200,1b2ff23000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806c819200,1b2ff23000,6c4c6000,3,22) at pmap_enter+0x38a sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower(ffff80003c415b00,ffff80003c415b38,ffff80003c415a80) at uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504 uvm_fault(fffffd806c8d63e8,1b2ff23000,0,2) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c415ca0,1b2ff23fa8) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c415ca0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x700d3d6a6c60, 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(ffffffff83451c58) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ceed,ffffffff8347bea1,90,ffffffff834242f6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8008170870,fffffd806c819238,d97f000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806c819238,d97f000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806c819200,1b2ff23000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806c819200,1b2ff23000,6c4c6000,3,22) at pmap_enter+0x38a sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower(ffff80003c415b00,ffff80003c415b38,ffff80003c415a80) at uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504 uvm_fault(fffffd806c8d63e8,1b2ff23000,0,2) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c415ca0,1b2ff23fa8) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c415ca0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x700d3d6a6c60, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c415620 rbx 0xffff8000299bee07 rdx 0 rcx 0xffff8000fffeea78 rax 0xffff8000299bdff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb3e1535526df6dd3 r11 0x6c077dbe12924959 r12 0xffff8000299bec08 r13 0 r14 0 r15 0x1 rip 0xffffffff81648fe5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c415610 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=91952 pid=79912 tcnt=2 stat=onproc flags process=0 proc=0 runpri=79, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffef240,0xffff8000fffefcb0 process=0xffff80002a3a3508 user=0xffff80003c410000, vmspace=0xfffffd806c8d63e8 estcpu=36, cpticks=3, pctcpu=0.0, user=1, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37656 404693 70044 0 3 0x80 nanoslp syz-executor 37656 272686 70044 0 3 0x4000080 fsleep syz-executor 37656 463022 70044 0 3 0x4000080 fsleep syz-executor 37656 177542 70044 0 3 0x4000080 fsleep syz-executor *79912 91952 25647 0 7 0 syz-executor 79912 152226 25647 0 3 0x4000080 fsleep syz-executor 64 423112 35768 0 2 0 syz-executor 64 65054 35768 0 3 0x4000080 lockf syz-executor 64 433192 35768 0 7 0x4000000 syz-executor 30172 87513 3395 60929 3 0x90 nanoslp syz-executor 30172 151285 3395 60929 3 0x4000090 fsleep syz-executor 30172 400851 3395 60929 2 0x4000010 syz-executor 30172 55898 3395 60929 3 0x4000090 fsleep syz-executor 71186 351974 0 0 3 0x14200 acct acct 2403 314747 76648 0 3 0x82 nanoslp syz-executor 17797 293843 14477 0 3 0x100082 sbwait arp 14477 493235 82338 0 3 0x10008a sigsusp sh 25647 35411 76648 0 3 0x82 nanoslp syz-executor 35768 472050 76648 0 3 0x82 nanoslp syz-executor 3395 99674 76648 0 3 0x82 nanoslp syz-executor 38888 201933 76648 0 3 0x82 wait syz-executor 70044 416853 76648 0 3 0x82 nanoslp syz-executor 82338 133179 76648 0 3 0x82 wait syz-executor 73398 156776 76648 0 3 0x82 nanoslp syz-executor 76648 269101 73012 0 3 0x82 kqread syz-executor 73012 461685 39142 0 3 0x10008a sigsusp ksh 39142 99793 93471 0 3 0x98 kqread sshd-session 93471 20953 8495 0 3 0x92 kqread sshd-session 5116 150649 1 0 3 0x100083 ttyopn getty 8495 344380 1 0 3 0x88 kqread sshd 37085 310270 25969 74 3 0x1100092 bpf pflogd 25969 22412 1 0 3 0x80 sbwait pflogd 74554 6145 13664 73 3 0x1100090 kqread syslogd 13664 409326 1 0 3 0x100082 sbwait syslogd 4636 24920 1 0 3 0x100080 kqread resolvd 20462 137387 25917 77 3 0x100092 kqread dhcpleased 99428 519595 25917 77 3 0x100092 kqread dhcpleased 25917 380830 1 0 3 0x80 kqread dhcpleased 34909 479184 0 0 3 0x14200 bored smr 84316 7931 0 0 2 0x14200 zerothread 43877 152779 0 0 3 0x14200 aiodoned aiodoned 64032 122160 0 0 3 0x14200 syncer update 97997 246880 0 0 3 0x14200 cleaner cleaner 82967 277907 0 0 3 0x14200 reaper reaper 67896 39231 0 0 3 0x14200 pgdaemon pagedaemon 54476 456905 0 0 3 0x14200 bored viomb 74014 411097 0 0 3 0x40014200 acpi0 acpi0 64110 275208 0 0 3 0x40014200 idle1 40022 51619 0 0 3 0x14200 bored softnet1 11527 269132 0 0 3 0x14200 bored softnet0 82321 284904 0 0 3 0x14200 bored systqmp 71529 371005 0 0 3 0x14200 bored systq 88492 235942 0 0 3 0x14200 tmoslp softclockmp 59288 315849 0 0 3 0x40014200 tmoslp softclock 30062 2884 0 0 3 0x40014200 idle0 1 355375 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 (0xfffffd806c819210) #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+0x4b4 sys/kern/kern_lock.c:487 #2 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2767 #3 uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 79912 (syz-executor) thread 0xffff8000fffeea78 (91952) exclusive rwlock uobjlk r = 0 (0xfffffd806cf71608) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1204 #3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806c8d64e8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c819210) #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+0x4b4 sys/kern/kern_lock.c:487 #2 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2767 #3 uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11073 12121K 12410K 166960K 12747 0 pcb 18 12K 12K 166960K 88 0 rtable 221 9K 9K 166960K 434 0 pf 35 17K 81K 166960K 91 0 ifaddr 42 7K 8K 166960K 71 0 ifgroup 55 2K 2K 166960K 105 0 sysctl 3 1K 9K 166960K 9 0 counters 70 37K 38K 166960K 144 0 ioctlops 0 0K 4K 166960K 1660 0 iov 0 0K 16K 166960K 56 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1299 82K 82K 166960K 1886 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 19 0 dirhash 15 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 89K 166960K 607 0 sigio 1 0K 0K 166960K 6 0 proc 72 115K 180K 166960K 606 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 73 0 in_multi 93 6K 7K 166960K 116 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 442 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 267 162K 179K 166960K 7400 0 UVM aobj 19 11K 11K 166960K 22 0 pinsyscall 45 90K 106K 166960K 1811 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 23 0 NDP 12 0K 1K 166960K 47 0 temp 58 9083K 9148K 166960K 28741 0 kqueue 13 20K 30K 166960K 125 0 SYN cache 2 8K 16K 166960K 3 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 120 134 0 128 1 0 1 1 0 8 0 rtentry 176 127 0 35 5 0 5 5 0 8 0 unpcb 144 367 0 346 4 2 2 4 0 8 1 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 5 0 5 1 0 1 1 0 8 1 tcpcb 736 163 0 151 7 3 4 7 0 8 2 arp 136 21 0 3 1 0 1 1 0 8 0 inpcb 328 433 0 414 7 3 4 7 0 8 2 ip6q 72 1 0 1 1 0 1 1 0 8 1 ip6af 40 2 0 2 1 0 1 1 0 8 1 nd6 152 29 0 5 2 0 2 2 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 32 0 32 1 0 1 1 0 8 1 pppxif 1504 2 0 2 1 0 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 7 0 1 1 0 1 1 0 482 0 pffrnode 88 7 0 1 1 0 1 1 0 8 0 pffrent 40 10 0 4 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 57 0 1 1 0 1 1 0 8 0 pfstkey 128 58 0 2 2 0 2 2 0 8 0 pfstate 448 58 0 2 7 0 7 7 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 529 0 125 28 0 28 28 0 8 2 art_table 40 530 0 125 5 0 5 5 0 8 0 art_node 32 127 0 45 1 0 1 1 0 8 0 sysvmsgpl 40 74 0 70 1 0 1 1 0 8 0 semapl 112 16 0 6 1 0 1 1 0 8 0 shmpl 112 14 0 2 1 0 1 1 0 8 0 dirhash 1024 27 0 8 3 0 3 3 0 8 0 dino2pl 256 2669 0 1205 93 0 93 93 0 8 0 ffsino 296 2669 0 1205 114 0 114 114 0 8 0 nchpl 144 3492 0 1787 64 0 64 64 0 8 0 rtmask 32 9 0 9 2 1 1 1 0 8 1 vnodes 216 2961 0 0 165 0 165 165 0 8 0 namei 1024 11810 0 11810 1 0 1 1 0 8 1 percpumem 16 87 0 37 1 0 1 1 0 8 0 vcpupl 3968 5 0 1 1 0 1 1 0 8 0 vmpool 848 5 0 1 1 0 1 1 0 8 0 kstatmem 264 62 0 36 3 0 3 3 0 8 1 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 15549 0 15549 11 7 4 8 1 8 4 plimitpl 152 158 0 139 1 0 1 1 0 8 0 sigapl 424 933 0 883 7 0 7 7 0 8 0 knotepl 120 538 0 0 17 0 17 17 0 8 0 kqueuepl 224 282 0 273 3 0 3 3 0 8 2 pipepl 344 167 0 139 3 0 3 3 0 8 0 fdescpl 528 914 0 881 3 0 3 3 0 8 0 filepl 160 5318 0 5070 14 0 14 14 0 8 3 lockfpl 104 244 0 240 1 0 1 1 0 8 0 lockfspl 48 78 0 75 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 59 0 42 1 0 1 1 0 8 0 ucredpl 104 918 0 904 1 0 1 1 0 8 0 zombiepl 144 886 0 883 1 0 1 1 0 8 0 processpl 1232 933 0 883 5 0 5 5 0 8 0 procpl 664 1777 0 1718 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 958 0 912 11 3 8 11 0 8 3 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 38 0 0 4 0 4 4 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 231 0 0 14 0 14 14 0 8 0 bufpl 280 5561 0 105 390 0 390 390 0 8 0 anonpl 32 10425 0 0 85 0 85 85 0 246 0 amapchunkpl 152 25198 0 24595 36 0 36 36 0 158 12 amappl16 200 3111 0 3079 23 11 12 15 0 8 8 amappl15 192 7 0 7 2 1 1 1 0 8 1 amappl14 184 446 0 444 1 0 1 1 0 8 0 amappl13 176 127 0 114 1 0 1 1 0 8 0 amappl12 168 1201 0 1169 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 69 0 55 1 0 1 1 0 8 0 amappl9 144 289 0 289 1 1 0 1 0 8 0 amappl8 136 110 0 107 1 0 1 1 0 8 0 amappl7 128 164 0 150 1 0 1 1 0 8 0 amappl6 120 167 0 165 1 0 1 1 0 8 0 amappl5 112 101 0 90 1 0 1 1 0 8 0 amappl4 104 302 0 280 1 0 1 1 0 8 0 amappl3 96 4651 0 4526 4 0 4 4 0 8 0 amappl2 88 567 0 505 2 0 2 2 0 8 0 amappl1 80 12437 0 11790 17 1 16 17 0 8 0 amappl 88 6545 0 6355 5 0 5 5 0 92 0 uvmvnodes 80 117 0 0 3 0 3 3 0 8 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 128 254 0 254 2 2 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 21 0 3 1 0 1 1 0 8 0 uaddrrnd 24 914 0 881 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 914 0 881 1 0 1 1 0 8 0 vmmpekpl 168 9451 0 9409 3 0 3 3 0 8 0 vmmpepl 168 66412 0 64361 100 0 100 100 0 357 8 vmsppl 488 913 0 881 5 0 5 5 0 8 0 rwobjpl 80 21034 0 19879 30 1 29 29 0 8 0 pdppl 4096 1845 0 1768 110 32 78 83 0 8 1 pvpl 32 17719 0 0 143 0 143 143 0 265 0 pmappl 256 918 0 882 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 294 0 38 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8390eff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83980340) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83980340) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 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 __mp_lock(ffffffff83980340) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83980340) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003c3fdde0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c3fdde0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6db4b4af3b0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff8390eff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83980340) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83980340) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 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 __mp_lock(ffffffff83980340) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83980340) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003c3fdde0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c3fdde0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6db4b4af3b0, 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(ffffffff83451c58) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ceed,ffffffff8347bea1,90,ffffffff834242f6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8008170870,fffffd806c819238,d97f000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806c819238,d97f000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806c819200,1b2ff23000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806c819200,1b2ff23000,6c4c6000,3,22) at pmap_enter+0x38a sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower(ffff80003c415b00,ffff80003c415b38,ffff80003c415a80) at uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504 uvm_fault(fffffd806c8d63e8,1b2ff23000,0,2) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c415ca0,1b2ff23fa8) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c415ca0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x700d3d6a6c60, count: 3 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83451c58) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ceed,ffffffff8347bea1,90,ffffffff834242f6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8008170870,fffffd806c819238,d97f000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806c819238,d97f000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806c819200,1b2ff23000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806c819200,1b2ff23000,6c4c6000,3,22) at pmap_enter+0x38a sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower(ffff80003c415b00,ffff80003c415b38,ffff80003c415a80) at uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504 uvm_fault(fffffd806c8d63e8,1b2ff23000,0,2) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c415ca0,1b2ff23fa8) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c415ca0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x700d3d6a6c60, count: -12