uvm_fault(0xffffffff82e2d188, 0x7f8000100008, 0, 2) -> e kernel: page fault trap, code=2 Stopped at pmap_page_remove+0x33d: xchgq %rax,0(%r14,%rcx,1) TID PID UID PRFLAGS PFLAGS CPU COMMAND 478788 31439 0 0x1a000002 0x4000000 0 syz-fuzzer *325585 23877 0 0x14000 0x200 1 reaper pmap_page_remove(fffffd80070188a0) at pmap_page_remove+0x33d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd80070188a0) at pmap_page_remove+0x33d sys/arch/amd64/amd64/pmap.c:1990 uvm_anfree_list(fffffd80675cc4f8,0) at uvm_anfree_list+0x98 amap_wipeout(fffffd806ca9f8b0) at amap_wipeout+0x1af sys/uvm/uvm_amap.c:502 uvm_unmap_detach(ffff80002a155cf0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 uvm_map_teardown(fffffd8069762018) at uvm_map_teardown+0x2f8 sys/uvm/uvm_map.c:2554 uvmspace_free(fffffd8069762018) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3461 reaper(ffff80002a148cd8) at reaper+0x197 sys/kern/kern_exit.c:463 end trace frame: 0x0, count: 8 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: uvm_fault(0xffffffff82e2d188, 0x7f8000100008, 0, 2) -> e ddb{1}> trace pmap_page_remove(fffffd80070188a0) at pmap_page_remove+0x33d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd80070188a0) at pmap_page_remove+0x33d sys/arch/amd64/amd64/pmap.c:1990 uvm_anfree_list(fffffd80675cc4f8,0) at uvm_anfree_list+0x98 amap_wipeout(fffffd806ca9f8b0) at amap_wipeout+0x1af sys/uvm/uvm_amap.c:502 uvm_unmap_detach(ffff80002a155cf0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 uvm_map_teardown(fffffd8069762018) at uvm_map_teardown+0x2f8 sys/uvm/uvm_map.c:2554 uvmspace_free(fffffd8069762018) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3461 reaper(ffff80002a148cd8) at reaper+0x197 sys/kern/kern_exit.c:463 end trace frame: 0x0, count: -7 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a155bf0 rbx 0xfffffd806ac10140 rdx 0 rcx 0x7f8000000000 rax 0 r8 0 r9 0 r10 0xa5d19dae0f0e237f r11 0x5021f425fe358c44 r12 0 r13 0x800000007f7c7000 r14 0x100008 acpi_pdirpa+0xebe79 r15 0xfffffd8007018908 rip 0xffffffff81f39bdd pmap_page_remove+0x33d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a155b70 ss 0x10 pmap_page_remove+0x33d: xchgq %rax,0(%r14,%rcx,1) ddb{1}> show proc PROC (reaper) tid=325585 pid=23877 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=84, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a148f68,0xffff80002a148a58 process=0xffff80002a15b9b8 user=0xffff80002a150000, vmspace=0xffffffff82e2d188 estcpu=34, cpticks=4, pctcpu=43.27, user=0, sys=4, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 41592 228208 25543 0 3 0x810008a sigsusp sh 25543 401161 31439 0 3 0x8000082 wait syz-executor.7 71382 69912 31439 0 3 0x8000082 wait syz-executor.6 59475 214736 31439 0 3 0x8000082 wait syz-executor.2 22029 357950 0 0 3 0x14280 nfsidl nfsio 95042 429052 0 0 3 0x14280 nfsidl nfsio 4402 285634 0 0 3 0x14280 nfsidl nfsio 93511 386608 0 0 3 0x14280 nfsidl nfsio 1856 405244 0 0 3 0x14280 nfsidl nfsio 47966 336228 0 0 3 0x14280 nfsidl nfsio 96242 233047 0 0 3 0x14280 nfsidl nfsio 50677 10562 0 0 3 0x14280 nfsidl nfsio 255 41369 0 0 3 0x14280 nfsidl nfsio 88525 179373 0 0 3 0x14280 nfsidl nfsio 65836 158812 0 0 3 0x14280 nfsidl nfsio 44308 31080 0 0 3 0x14280 nfsidl nfsio 10821 481727 0 0 3 0x14280 nfsidl nfsio 76740 120244 0 0 3 0x14280 nfsidl nfsio 25419 69115 0 0 3 0x14280 nfsidl nfsio 5845 424968 0 0 3 0x14280 nfsidl nfsio 48678 260942 0 0 3 0x14280 nfsidl nfsio 26662 284885 0 0 3 0x14280 nfsidl nfsio 11724 335967 0 0 3 0x14280 nfsidl nfsio 67567 108204 0 0 3 0x14280 nfsidl nfsio 35076 267720 31439 0 2 0x8000002 syz-executor.4 95665 6201 31439 0 3 0x8000082 wait syz-executor.5 77351 134774 31439 0 3 0x8000082 wait syz-executor.0 57083 358125 31439 0 3 0x8000082 wait syz-executor.3 60146 202515 0 0 3 0x14200 bored sosplice 40724 89349 31439 0 3 0x8000082 wait syz-executor.1 31439 513710 87929 0 3 0x1a000082 wait syz-fuzzer 31439 2118 87929 0 2 0x1e000082 syz-fuzzer 31439 423992 87929 0 3 0x1e000082 thrsleep syz-fuzzer 31439 473195 87929 0 3 0x1e000082 wait syz-fuzzer 31439 158164 87929 0 3 0x1e000082 wait syz-fuzzer 31439 311562 87929 0 3 0x1e000082 wait syz-fuzzer 31439 135214 87929 0 3 0x1e000082 thrsleep syz-fuzzer 31439 424388 87929 0 3 0x1e000082 wait syz-fuzzer 31439 57521 87929 0 3 0x1e000082 wait syz-fuzzer 31439 497848 87929 0 3 0x1e000082 wait syz-fuzzer 31439 298396 87929 0 3 0x1e000082 thrsleep syz-fuzzer 31439 336102 87929 0 3 0x1e000082 thrsleep syz-fuzzer 31439 257305 87929 0 3 0x1e000082 thrsleep syz-fuzzer 31439 478788 87929 0 7 0x1e000002 syz-fuzzer 31439 494448 87929 0 3 0x1e000082 wait syz-fuzzer 31439 56212 87929 0 2 0x1e000002 syz-fuzzer 87929 158 70127 0 3 0x810008a sigsusp ksh 70127 3833 82540 0 3 0x1800009a kqread sshd 66433 148304 1 0 3 0x18100083 ttyin getty 82540 312290 1 0 3 0x18000088 kqread sshd 37193 428785 74078 73 2 0x19100010 syslogd 74078 310047 1 0 3 0x18100082 sbwait syslogd 57234 85889 1 0 3 0x18100080 kqread resolvd 86767 496588 75626 77 3 0x18100092 kqread dhcpleased 97721 234439 75626 77 3 0x18100092 kqread dhcpleased 75626 193500 1 0 3 0x18000080 kqread dhcpleased 34990 412309 0 0 3 0x14200 bored smr 49537 12626 0 0 2 0x14200 zerothread 43512 128755 0 0 3 0x14200 aiodoned aiodoned 81902 233318 0 0 3 0x14200 syncer update 98757 411026 0 0 3 0x14200 cleaner cleaner *23877 325585 0 0 7 0x14200 reaper 18650 318427 0 0 3 0x14200 pgdaemon pagedaemon 96865 484133 0 0 3 0x14200 bored viomb 50886 270817 0 0 3 0x40014200 acpi0 acpi0 2489 279989 0 0 3 0x40014200 idle1 47266 449654 0 0 3 0x14200 bored softnet3 8989 173434 0 0 3 0x14200 bored softnet2 25901 57072 0 0 3 0x14200 bored softnet1 41098 29962 0 0 2 0x14200 softnet0 61675 307052 0 0 3 0x14200 bored systqmp 63967 103966 0 0 3 0x14200 bored systq 13269 2681 0 0 3 0x14200 tmoslp softclockmp 80591 108232 0 0 3 0x40014200 tmoslp softclock 10842 141347 0 0 3 0x40014200 idle0 1 295716 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806b178308) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 mtx_enter_try+0x103 #2 mtx_enter+0x4e sys/kern/kern_lock.c:266 #3 pmap_page_remove+0xa7 rcr3 machine/cpufunc.h:141 [inline] #3 pmap_page_remove+0xa7 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:425 [inline] #3 pmap_page_remove+0xa7 sys/arch/amd64/amd64/pmap.c:1950 #4 uvm_anfree_list+0x98 #5 amap_wipeout+0x1af sys/uvm/uvm_amap.c:502 #6 uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 #7 uvm_map_teardown+0x2f8 sys/uvm/uvm_map.c:2554 #8 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3461 #9 reaper+0x197 sys/kern/kern_exit.c:463 #10 proc_trampoline+0x10 Process 37193 (syslogd) thread 0xffff8000ffffdc40 (428785) Process 23877 (reaper) thread 0xffff80002a148cd8 (325585) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10177 6416K 6937K 166960K 12606 0 pcb 17 12K 12K 166960K 167 0 rtable 132 12K 14K 166960K 642 0 pf 29 9K 10K 166960K 87 0 ifaddr 28 12K 16K 166960K 93 0 ifgroup 50 2K 2K 166960K 141 0 sysctl 3 0K 0K 166960K 3 0 counters 62 36K 37K 166960K 106 0 ioctlops 0 0K 4K 166960K 1522 0 iov 0 0K 24K 166960K 45 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1373 86K 87K 166960K 2015 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 72 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 11 37K 89K 166960K 981 0 sigio 0 0K 0K 166960K 12 0 proc 59 79K 115K 166960K 759 0 subproc 104 6K 7K 166960K 208 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 96 0 in_multi 44 3K 7K 166960K 198 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 554 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 281 76K 94K 166960K 10767 0 UVM aobj 39 2K 2K 166960K 39 0 pinsyscall 31 62K 100K 166960K 2308 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 67 0 NDP 10 0K 1K 166960K 62 0 temp 74 6820K 6948K 166960K 34707 0 kqueue 12 18K 24K 166960K 149 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 129 0 126 1 0 1 1 0 8 0 rtentry 112 206 0 150 4 1 3 4 0 8 0 unpcb 144 632 0 619 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpqe 32 30 0 30 3 3 0 1 0 8 0 tcpcb 808 242 0 237 3 2 1 2 0 8 0 arp 120 35 0 27 1 0 1 1 0 8 0 inpcb 384 906 0 898 12 10 2 3 0 8 1 nd6 136 53 0 42 1 0 1 1 0 8 0 pkpcb 40 4 0 4 3 3 0 1 0 8 0 kcovpl 48 16 0 8 1 0 1 1 0 8 0 ppxss 1168 1 0 1 1 1 0 1 0 8 0 pffrag 232 12 0 11 2 1 1 1 0 482 0 pffrnode 88 11 0 10 2 1 1 1 0 8 0 pffrent 40 99 0 98 2 1 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 98 0 90 1 0 1 1 0 8 0 pfstkey 128 98 0 90 2 1 1 2 0 8 0 pfstate 376 98 0 90 5 2 3 5 0 8 0 pfrule 1344 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 256 788 0 549 34 13 21 30 0 8 0 art_table 32 789 0 549 4 0 4 4 0 8 0 art_node 16 203 0 152 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 12 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 67 0 57 1 0 1 1 0 8 0 shmpl 112 36 0 0 2 0 2 2 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 2912 0 1395 96 0 96 96 0 8 0 ffsino 272 2912 0 1395 102 0 102 102 0 8 0 nchpl 144 4456 0 2710 67 0 67 67 0 8 0 uvmvnodes 80 3465 0 0 71 0 71 71 0 8 0 vnodes 216 3465 0 0 193 0 193 193 0 8 0 namei 1024 15368 0 15368 5 4 1 2 0 8 1 percpumem 16 67 0 22 1 0 1 1 0 8 0 vcpupl 3904 1 0 0 1 0 1 1 0 8 0 vmpool 696 3 0 2 3 2 1 1 0 8 0 kstatmem 264 64 0 44 2 0 2 2 0 8 0 scsiplug 72 4 0 4 3 3 0 1 0 8 0 scxspl 216 21117 0 21117 15 14 1 8 1 8 1 plimitpl 152 149 0 134 1 0 1 1 0 8 0 sigapl 424 1292 0 1224 8 0 8 8 0 8 0 futexpl 64 13427 0 13427 2 1 1 1 0 8 1 knotepl 120 419 0 0 11 0 11 11 0 8 0 kqueuepl 216 269 0 261 1 0 1 1 0 8 0 pipepl 320 263 0 235 3 0 3 3 0 8 0 fdescpl 496 1252 0 1230 6 2 4 5 0 8 0 filepl 152 7134 0 6901 11 0 11 11 0 8 0 lockfpl 104 184 0 182 1 0 1 1 0 8 0 lockfspl 48 89 0 87 1 0 1 1 0 8 0 sessionpl 144 31 0 15 1 0 1 1 0 8 0 pgrppl 48 45 0 29 1 0 1 1 0 8 0 ucredpl 104 1106 0 1094 1 0 1 1 0 8 0 zombiepl 144 1231 0 1224 2 1 1 1 0 8 0 processpl 1136 1292 0 1224 6 0 6 6 0 8 0 procpl 656 2258 0 2167 9 1 8 9 0 8 0 srpgc 96 18 0 18 6 6 0 1 0 8 0 sosppl 168 17 0 17 5 5 0 1 0 8 0 sockpl 664 1679 0 1655 8 5 3 4 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 360 0 0 45 0 45 45 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 971 0 0 60 0 60 60 0 8 0 bufpl 280 9994 0 1846 583 0 583 583 0 8 0 anonpl 24 332475 0 326549 120 54 66 88 0 186 3 amapchunkpl 152 37317 0 36632 59 22 37 41 0 158 2 amappl16 200 7463 0 7344 39 28 11 19 0 8 2 amappl15 192 20 0 20 1 1 0 1 0 8 0 amappl14 184 280 0 268 2 0 2 2 0 8 0 amappl13 176 41 0 41 1 1 0 1 0 8 0 amappl12 168 2037 0 2005 2 0 2 2 0 8 0 amappl11 160 52 0 41 1 0 1 1 0 8 0 amappl10 152 55 0 46 1 0 1 1 0 8 0 amappl9 144 295 0 295 2 2 0 1 0 8 0 amappl8 136 200 0 166 2 0 2 2 0 8 0 amappl7 128 56 0 42 1 0 1 1 0 8 0 amappl6 120 428 0 412 2 1 1 2 0 8 0 amappl5 112 211 0 197 1 0 1 1 0 8 0 amappl4 104 602 0 567 2 0 2 2 0 8 0 amappl3 96 6661 0 6580 3 0 3 3 0 8 0 amappl2 88 1632 0 1561 4 2 2 4 0 8 0 amappl1 80 12530 0 12037 22 11 11 22 0 8 0 amappl 88 10125 0 9929 7 2 5 6 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 38 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1255 0 1226 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1255 0 1226 1 0 1 1 0 8 0 vmmpekpl 168 13431 0 13359 4 0 4 4 0 8 0 vmmpepl 168 96367 0 94500 135 40 95 113 0 357 5 vmsppl 440 1254 0 1225 4 0 4 4 0 8 0 rwobjpl 56 33225 0 28645 77 10 67 67 0 8 0 pdppl 4096 2517 0 2451 171 101 70 77 0 8 4 pvpl 32 46417 0 0 377 2 375 375 0 265 0 pmappl 248 1254 0 1225 4 2 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 529 0 124 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82d41ff0) at x86_ipi_db+0x1e 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+0x27 __mp_lock(ffffffff82e1d098) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82e1d098) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 spllower(0) at spllower+0x48 read_rflags machine/cpufunc.h:195 [inline] spllower(0) at spllower+0x48 intr_disable machine/cpufunc.h:216 [inline] spllower(0) at spllower+0x48 sys/arch/amd64/amd64/intr.c:728 msleep(fffffd806f31d360,fffffd806f31d360,318,ffffffff828fbc37,488) at msleep+0x204 sys/kern/kern_synch.c:255 kqueue_sleep(fffffd806f31d360,ffff80002f0f4518) at kqueue_sleep+0xfa sys/kern/kern_event.c:1339 kqueue_scan(ffff80002f0f4310,8,ffff80002f0f4410,ffff80002f0f4518,ffff8000ffff5c58,ffff80002f0f4558) at kqueue_scan+0x1bc sys/kern/kern_event.c:1394 sys_kevent(ffff8000ffff5c58,ffff80002f0f46a0,ffff80002f0f45f0) at sys_kevent+0x567 sys/kern/kern_event.c:1062 syscall(ffff80002f0f46a0) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002f0f46a0) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x26d9e9420, count: 2 ddb{0}> trace x86_ipi_db(ffffffff82d41ff0) at x86_ipi_db+0x1e 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+0x27 __mp_lock(ffffffff82e1d098) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82e1d098) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 spllower(0) at spllower+0x48 read_rflags machine/cpufunc.h:195 [inline] spllower(0) at spllower+0x48 intr_disable machine/cpufunc.h:216 [inline] spllower(0) at spllower+0x48 sys/arch/amd64/amd64/intr.c:728 msleep(fffffd806f31d360,fffffd806f31d360,318,ffffffff828fbc37,488) at msleep+0x204 sys/kern/kern_synch.c:255 kqueue_sleep(fffffd806f31d360,ffff80002f0f4518) at kqueue_sleep+0xfa sys/kern/kern_event.c:1339 kqueue_scan(ffff80002f0f4310,8,ffff80002f0f4410,ffff80002f0f4518,ffff8000ffff5c58,ffff80002f0f4558) at kqueue_scan+0x1bc sys/kern/kern_event.c:1394 sys_kevent(ffff8000ffff5c58,ffff80002f0f46a0,ffff80002f0f45f0) at sys_kevent+0x567 sys/kern/kern_event.c:1062 syscall(ffff80002f0f46a0) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002f0f46a0) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x26d9e9420, count: -13 ddb{0}> machine ddbcpu 1 Stopped at pmap_page_remove+0x33d: xchgq %rax,0(%r14,%rcx,1) pmap_page_remove(fffffd80070188a0) at pmap_page_remove+0x33d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd80070188a0) at pmap_page_remove+0x33d sys/arch/amd64/amd64/pmap.c:1990 uvm_anfree_list(fffffd80675cc4f8,0) at uvm_anfree_list+0x98 amap_wipeout(fffffd806ca9f8b0) at amap_wipeout+0x1af sys/uvm/uvm_amap.c:502 uvm_unmap_detach(ffff80002a155cf0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 uvm_map_teardown(fffffd8069762018) at uvm_map_teardown+0x2f8 sys/uvm/uvm_map.c:2554 uvmspace_free(fffffd8069762018) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3461 reaper(ffff80002a148cd8) at reaper+0x197 sys/kern/kern_exit.c:463 end trace frame: 0x0, count: 8 ddb{1}> trace pmap_page_remove(fffffd80070188a0) at pmap_page_remove+0x33d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd80070188a0) at pmap_page_remove+0x33d sys/arch/amd64/amd64/pmap.c:1990 uvm_anfree_list(fffffd80675cc4f8,0) at uvm_anfree_list+0x98 amap_wipeout(fffffd806ca9f8b0) at amap_wipeout+0x1af sys/uvm/uvm_amap.c:502 uvm_unmap_detach(ffff80002a155cf0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 uvm_map_teardown(fffffd8069762018) at uvm_map_teardown+0x2f8 sys/uvm/uvm_map.c:2554 uvmspace_free(fffffd8069762018) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3461 reaper(ffff80002a148cd8) at reaper+0x197 sys/kern/kern_exit.c:463 end trace frame: 0x0, count: -7