uvm_fault(0xffffffff82d9b4c0, 0x7f864ff9c148, 0, 2) -> e kernel: page fault trap, code=2 Stopped at pmap_page_remove+0x30d: xchgq %rax,0(%r12,%rcx,1) TID PID UID PRFLAGS PFLAGS CPU COMMAND * 97199 96164 0 0x14000 0x200 0 reaper pmap_page_remove(fffffd8005cd2c80) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005cd2c80) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1990 uvm_anfree_list(fffffd806aa31978,ffff80002a5d4f18) at uvm_anfree_list+0x98 amap_wipeout(fffffd806b3b9ab8) at amap_wipeout+0x1d1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff80002a5d4fe0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 uvm_map_teardown(fffffd806eda5568) at uvm_map_teardown+0x27f sys/uvm/uvm_map.c:2556 uvmspace_free(fffffd806eda5568) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461 reaper(ffff80002a5d79a8) at reaper+0x15a 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff82d9b4c0, 0x7f864ff9c148, 0, 2) -> e ddb> trace pmap_page_remove(fffffd8005cd2c80) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005cd2c80) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1990 uvm_anfree_list(fffffd806aa31978,ffff80002a5d4f18) at uvm_anfree_list+0x98 amap_wipeout(fffffd806b3b9ab8) at amap_wipeout+0x1d1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff80002a5d4fe0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 uvm_map_teardown(fffffd806eda5568) at uvm_map_teardown+0x27f sys/uvm/uvm_map.c:2556 uvmspace_free(fffffd806eda5568) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461 reaper(ffff80002a5d79a8) at reaper+0x15a sys/kern/kern_exit.c:463 end trace frame: 0x0, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002a5d4ec0 rbx 0x800000007f7cb000 rdx 0 rcx 0x7f8000000000 rax 0 r8 0xc9ff3074000 r9 0 r10 0xbbea6d4a27e90b17 r11 0xc9c9d25fb8e15e87 r12 0x64ff9c148 r13 0xfffffd806ab70608 r14 0 r15 0xfffffd8005cd2c80 rip 0xffffffff81809d6d pmap_page_remove+0x30d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a5d4e30 ss 0x10 pmap_page_remove+0x30d: xchgq %rax,0(%r12,%rcx,1) ddb> show proc PROC (reaper) tid=97199 pid=96164 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=4, usrpri=84, slppri=4, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a58d9a0,0xffff80002a5d7728 process=0xffff8000ffffd920 user=0xffff80002a5d0000, vmspace=0xffffffff82d9b4c0 estcpu=34, cpticks=1, pctcpu=19.51, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 42537 167313 0 0 3 0x14200 acct acct 94167 31198 1 0 3 0x18100083 ttyin getty 14330 300212 0 0 3 0x14200 bored sosplice 41944 469506 41627 0 3 0x1a000082 thrsleep syz-fuzzer 41944 38649 41627 0 3 0x1e000082 nanoslp syz-fuzzer 41944 454356 41627 0 3 0x1e000002 inode syz-fuzzer 41944 368204 41627 0 2 0x1e000002 syz-fuzzer 41944 178453 41627 0 3 0x1e000082 wait syz-fuzzer 41944 80227 41627 0 3 0x1e000082 thrsleep syz-fuzzer 41944 328672 41627 0 3 0x1e000082 wait syz-fuzzer 41944 197639 41627 0 2 0x1e000082 syz-fuzzer 41944 389940 41627 0 3 0x1e000082 wait syz-fuzzer 41944 264071 41627 0 3 0x1e000082 wait syz-fuzzer 41944 295209 41627 0 3 0x1e000082 thrsleep syz-fuzzer 41944 276650 41627 0 3 0x1e000082 thrsleep syz-fuzzer 41944 294767 41627 0 3 0x1e000082 wait syz-fuzzer 41944 323286 41627 0 3 0x1e000082 wait syz-fuzzer 41627 412851 12352 0 3 0x810008a sigsusp ksh 12352 24677 66135 0 3 0x1800009a kqread sshd 66135 82338 1 0 3 0x18000088 kqread sshd 34238 442690 52777 73 2 0x19100010 syslogd 52777 193542 1 0 3 0x18100082 sbwait syslogd 75586 65423 1 0 3 0x18100080 kqread resolvd 76682 301062 11953 77 2 0x18100012 dhcpleased 68839 360802 11953 77 3 0x18100092 kqread dhcpleased 11953 205630 1 0 3 0x18000080 kqread dhcpleased 26832 308074 0 0 3 0x14200 bored smr 56019 22475 0 0 2 0x14200 zerothread 24497 324604 0 0 3 0x14200 aiodoned aiodoned 65326 221123 0 0 3 0x14200 syncer update 37361 242803 0 0 3 0x14200 cleaner cleaner *96164 97199 0 0 7 0x14200 reaper 30688 71693 0 0 3 0x14200 pgdaemon pagedaemon 15098 296128 0 0 3 0x14200 bored viomb 89866 498868 0 0 3 0x40014200 acpi0 acpi0 84889 279512 0 0 3 0x14200 bored softnet3 90760 279543 0 0 3 0x14200 bored softnet2 18182 228366 0 0 3 0x14200 bored softnet1 44675 366123 0 0 2 0x14200 softnet0 51062 22575 0 0 3 0x14200 bored systqmp 36411 204237 0 0 3 0x14200 bored systq 11322 430844 0 0 3 0x40014200 tmoslp softclock 98479 18345 0 0 3 0x40014200 idle0 1 257884 0 0 2 0x8080082 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 10173 6415K 6926K 166960K 14977 0 pcb 17 18K 20K 166960K 363 0 rtable 146 5K 8K 166960K 1770 0 pf 27 8K 9K 166960K 166 0 ifaddr 32 9K 11K 166960K 237 0 ifgroup 46 2K 2K 166960K 295 0 sysctl 3 1K 2K 166960K 4 0 counters 29 17K 17K 166960K 94 0 ioctlops 0 0K 2K 166960K 256 0 iov 0 0K 16K 166960K 137 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1458 92K 92K 166960K 4112 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 68K 76K 166960K 48 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 319 0 dirhash 12 2K 2K 166960K 69 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 8 25K 105K 166960K 3028 0 sigio 0 0K 0K 166960K 214 0 proc 58 59K 132K 166960K 1726 0 subproc 78 4K 8K 166960K 662 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 674 0 in_multi 66 4K 7K 166960K 659 0 ether_multi 1 0K 0K 166960K 50 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 115 519K 519K 166960K 115 0 exec 0 0K 1K 166960K 1186 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 228 63K 100K 166960K 27376 0 UVM aobj 141 8K 8K 166960K 152 0 pinsyscall 28 56K 100K 166960K 5266 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 340 0 NDP 10 0K 2K 166960K 173 0 temp 70 6811K 6885K 166960K 49587 0 kqueue 12 18K 26K 166960K 361 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 478 0 475 3 0 3 3 0 8 2 rtentry 112 597 0 534 3 0 3 3 0 8 0 unpcb 144 2039 0 2026 6 0 6 6 0 8 5 syncache 336 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 107 0 107 1 1 0 1 0 8 0 tcpcb 808 1617 0 1612 12 3 9 11 0 8 8 arp 88 106 0 96 1 0 1 1 0 8 0 ipq 40 7 0 7 1 0 1 1 0 8 1 ipqe 40 56 0 56 1 0 1 1 0 8 1 inpcb 360 4301 0 4293 27 18 9 14 0 8 8 nd6 104 175 0 157 1 0 1 1 0 8 0 pkpcb 40 16 0 16 2 1 1 1 0 8 1 kcovpl 48 49 0 43 1 0 1 1 0 8 0 ppxss 1072 10 0 10 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2375 0 2087 42 17 25 25 0 8 1 art_table 32 2376 0 2087 4 0 4 4 0 8 0 art_node 16 596 0 541 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 16 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 316 0 306 1 0 1 1 0 8 0 shmpl 112 149 0 11 4 0 4 4 0 8 0 dirhash 1024 55 0 38 3 0 3 3 0 8 0 dino2pl 256 5823 0 4295 96 0 96 96 0 8 0 ffsino 240 5823 0 4295 91 0 91 91 0 8 0 nchpl 144 9665 0 7945 66 0 66 66 0 8 0 uvmvnodes 80 6852 0 0 140 0 140 140 0 8 0 vnodes 216 6852 0 0 381 0 381 381 0 8 0 namei 1024 37139 0 37139 3 1 2 2 0 8 2 vcpupl 3904 6 0 1 1 0 1 1 0 8 0 vmpool 664 43 0 38 2 1 1 1 0 8 0 kstatmem 264 150 0 130 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 50117 0 50117 9 7 2 8 1 8 2 plimitpl 152 615 0 598 1 0 1 1 0 8 0 sigapl 424 3250 0 3206 7 0 7 7 0 8 1 futexpl 64 38444 0 38444 1 0 1 1 0 8 1 knotepl 120 33483 0 33417 39 26 13 18 0 8 8 kqueuepl 184 979 0 971 9 0 9 9 0 8 8 pipepl 288 772 0 752 7 0 7 7 0 8 4 fdescpl 432 3231 0 3212 5 0 5 5 0 8 1 filepl 120 22658 0 22472 19 3 16 18 0 8 7 lockfpl 104 719 0 717 1 0 1 1 0 8 0 lockfspl 48 254 0 252 1 0 1 1 0 8 0 sessionpl 144 65 0 50 1 0 1 1 0 8 0 pgrppl 48 111 0 96 1 0 1 1 0 8 0 ucredpl 104 4211 0 4194 1 0 1 1 0 8 0 zombiepl 144 3219 0 3206 1 0 1 1 0 8 0 processpl 1072 3250 0 3206 4 0 4 4 0 8 0 procpl 656 6546 0 6489 9 1 8 8 0 8 1 sosppl 168 50 0 50 2 1 1 1 0 8 1 sockpl 504 6852 0 6828 85 74 11 29 0 8 8 mcl64k 65536 1 0 1 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k 9216 3 0 3 1 0 1 1 0 8 1 mcl8k 8192 39 0 39 2 1 1 1 0 8 1 mcl4k 4096 20 0 20 2 1 1 1 0 8 1 mcl2k 2048 34658 0 34555 50 29 21 36 0 8 7 mtagpl 96 93 0 93 1 0 1 1 0 8 1 mbufpl 256 95203 0 95091 108 87 21 61 0 8 7 bufpl 280 11693 0 3740 569 0 569 569 0 8 0 anonpl 24 506348 0 496070 124 29 95 95 0 188 28 amapchunkpl 152 93561 0 92792 62 13 49 49 0 158 10 amappl16 200 10470 0 10373 41 24 17 19 0 8 8 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 288 0 275 2 1 1 2 0 8 0 amappl13 176 13 0 13 2 1 1 1 0 8 1 amappl12 168 4502 0 4481 2 0 2 2 0 8 0 amappl11 160 50 0 40 1 0 1 1 0 8 0 amappl10 152 83 0 76 1 0 1 1 0 8 0 amappl9 144 156 0 156 1 1 0 1 0 8 0 amappl8 136 172 0 140 2 0 2 2 0 8 0 amappl7 128 67 0 53 1 0 1 1 0 8 0 amappl6 120 898 0 884 2 1 1 2 0 8 0 amappl5 112 332 0 320 1 0 1 1 0 8 0 amappl4 104 873 0 840 3 1 2 3 0 8 0 amappl3 96 17111 0 17062 3 0 3 3 0 8 0 amappl2 88 3770 0 3708 4 2 2 4 0 8 0 amappl1 80 20914 0 20455 22 10 12 22 0 8 0 amappl 88 26420 0 26281 6 0 6 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 72 151 0 11 3 0 3 3 0 8 0 uaddrrnd 24 3274 0 3250 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3274 0 3250 1 0 1 1 0 8 0 vmmpekpl 168 27951 0 27888 4 0 4 4 0 8 0 vmmpepl 168 215121 0 213666 127 33 94 114 0 357 10 vmsppl 344 3273 0 3249 5 1 4 4 0 8 0 rwobjpl 24 62643 0 54696 50 0 50 50 0 8 0 pdppl 4096 6554 0 6503 252 183 69 85 0 8 18 pvpl 32 1318384 0 1298486 540 294 246 391 0 265 72 pmappl 216 3273 0 3249 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 759 0 399 12 0 12 12 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace pmap_page_remove(fffffd8005cd2c80) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005cd2c80) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1990 uvm_anfree_list(fffffd806aa31978,ffff80002a5d4f18) at uvm_anfree_list+0x98 amap_wipeout(fffffd806b3b9ab8) at amap_wipeout+0x1d1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff80002a5d4fe0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 uvm_map_teardown(fffffd806eda5568) at uvm_map_teardown+0x27f sys/uvm/uvm_map.c:2556 uvmspace_free(fffffd806eda5568) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461 reaper(ffff80002a5d79a8) at reaper+0x15a sys/kern/kern_exit.c:463 end trace frame: 0x0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace pmap_page_remove(fffffd8005cd2c80) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005cd2c80) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1990 uvm_anfree_list(fffffd806aa31978,ffff80002a5d4f18) at uvm_anfree_list+0x98 amap_wipeout(fffffd806b3b9ab8) at amap_wipeout+0x1d1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff80002a5d4fe0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1354 uvm_map_teardown(fffffd806eda5568) at uvm_map_teardown+0x27f sys/uvm/uvm_map.c:2556 uvmspace_free(fffffd806eda5568) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461 reaper(ffff80002a5d79a8) at reaper+0x15a sys/kern/kern_exit.c:463 end trace frame: 0x0, count: -7