uvm_fault(0xffffffff82a68708, 0x7f81d25a9a80, 0, 2) -> e kernel: page fault trap, code=0 Stopped at pmap_page_remove+0x30d: xchgq %rax,0(%r15,%rcx,1) TID PID UID PRFLAGS PFLAGS CPU COMMAND *381101 14894 0 0x14000 0x200 0 reaper pmap_page_remove(fffffd8005f96080) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005f96080) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959 uvm_anfree_list(fffffd80682b3690,ffff8000215ae1b8) at uvm_anfree_list+0x98 amap_wipeout(fffffd806f93ecc0) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff8000215ae280,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1599 uvm_map_teardown(fffffd8072b0faa8) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2791 uvmspace_free(fffffd8072b0faa8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffefc0) at reaper+0x15d sys/kern/kern_exit.c:454 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(0xffffffff82a68708, 0x7f81d25a9a80, 0, 2) -> e ddb> trace pmap_page_remove(fffffd8005f96080) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005f96080) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959 uvm_anfree_list(fffffd80682b3690,ffff8000215ae1b8) at uvm_anfree_list+0x98 amap_wipeout(fffffd806f93ecc0) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff8000215ae280,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1599 uvm_map_teardown(fffffd8072b0faa8) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2791 uvmspace_free(fffffd8072b0faa8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffefc0) at reaper+0x15d sys/kern/kern_exit.c:454 end trace frame: 0x0, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff8000215ae160 rbx 0 rdx 0 rcx 0x7f8000000000 rax 0 r8 0 r9 0xffff8000215ae158 r10 0x61bb8164f7d9b155 r11 0xb5cd7e6bba5f75b3 r12 0x7fbfc0000000 r13 0xfffffd806b2d7828 r14 0x800000007f7ce000 r15 0x1d25a9a80 rip 0xffffffff814184ed pmap_page_remove+0x30d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000215ae0d0 ss 0x10 pmap_page_remove+0x30d: xchgq %rax,0(%r15,%rcx,1) ddb> show proc PROC (reaper) pid=381101 stat=onproc flags process=14000 proc=200 pri=4, usrpri=73, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffe540,0xffff8000fffff270 process=0xffff8000ffffabc0 user=0xffff8000215a9000, vmspace=0xffffffff82a68708 estcpu=23, cpticks=5, pctcpu=10.50 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 90274 94121 4665 0 2 0 syz-executor.3 48070 104028 15242 0 2 0 syz-executor.6 32773 431688 92688 0 2 0 syz-executor.0 32773 42354 92688 0 2 0x4000000 syz-executor.0 26069 3357 80830 0 2 0 syz-executor.7 26069 511245 80830 0 3 0x4000080 fsleep syz-executor.7 30767 73501 94859 0 2 0x2 syz-executor.5 53532 443215 94859 0 2 0x2 syz-executor.4 92688 327858 94859 0 3 0x82 nanoslp syz-executor.0 26266 49300 0 0 3 0x14280 nfsidl nfsio 4449 235382 0 0 3 0x14280 nfsidl nfsio 55512 305188 0 0 3 0x14280 nfsidl nfsio 78960 172443 0 0 3 0x14280 nfsidl nfsio 17473 456052 0 0 3 0x14280 nfsidl nfsio 21825 72459 0 0 3 0x14280 nfsidl nfsio 48155 306557 0 0 3 0x14280 nfsidl nfsio 84067 115487 0 0 3 0x14280 nfsidl nfsio 96323 278048 0 0 3 0x14280 nfsidl nfsio 92041 209941 0 0 3 0x14280 nfsidl nfsio 74460 283019 0 0 3 0x14280 nfsidl nfsio 89785 450244 0 0 3 0x14280 nfsidl nfsio 24062 352338 0 0 3 0x14280 nfsidl nfsio 4358 477162 0 0 3 0x14280 nfsidl nfsio 27664 154977 0 0 3 0x14280 nfsidl nfsio 18801 499970 0 0 3 0x14280 nfsidl nfsio 57962 432964 0 0 3 0x14280 nfsidl nfsio 782 267809 0 0 3 0x14280 nfsidl nfsio 20491 121967 0 0 3 0x14280 nfsidl nfsio 44537 363503 0 0 3 0x14280 nfsidl nfsio 11395 202639 0 0 3 0x14200 bored sosplice 80830 90372 94859 0 3 0x82 nanoslp syz-executor.7 15242 445004 94859 0 3 0x82 nanoslp syz-executor.6 4665 129997 94859 0 3 0x82 nanoslp syz-executor.3 30122 437915 94859 0 2 0x2 syz-executor.2 94859 505853 14132 0 3 0x82 thrsleep syz-fuzzer 94859 200515 14132 0 3 0x4000082 nanoslp syz-fuzzer 94859 352898 14132 0 3 0x4000082 thrsleep syz-fuzzer 94859 331438 14132 0 3 0x4000082 thrsleep syz-fuzzer 94859 401845 14132 0 3 0x4000082 thrsleep syz-fuzzer 94859 509325 14132 0 3 0x4000082 thrsleep syz-fuzzer 94859 318386 14132 0 3 0x4000082 thrsleep syz-fuzzer 94859 309213 14132 0 2 0x4000082 syz-fuzzer 94859 29148 14132 0 3 0x4000082 thrsleep syz-fuzzer 14132 336962 45606 0 3 0x10008a sigsusp ksh 45606 309812 22128 0 3 0x9a kqread sshd 7637 223558 1 0 3 0x100083 ttyin getty 22128 133643 1 0 3 0x88 kqread sshd 11937 374944 44647 73 2 0x1100010 syslogd 44647 258052 1 0 3 0x100082 netio syslogd 88734 363378 1 0 3 0x100080 kqread resolvd 81737 323577 75384 77 3 0x100092 kqread dhcpleased 19798 109737 75384 77 3 0x100092 kqread dhcpleased 75384 413417 1 0 3 0x80 kqread dhcpleased 71778 259639 0 0 3 0x14200 bored smr 28433 182782 0 0 2 0x14200 zerothread 96212 430841 0 0 3 0x14200 aiodoned aiodoned 33689 499822 0 0 3 0x14200 syncer update 6652 522973 0 0 3 0x14200 cleaner cleaner *14894 381101 0 0 7 0x14200 reaper 42148 315051 0 0 3 0x14200 pgdaemon pagedaemon 2069 462939 0 0 3 0x14200 bored viomb 55546 477107 0 0 3 0x40014200 acpi0 acpi0 62769 86363 0 0 3 0x14200 bored softnet 47985 241901 0 0 3 0x14200 bored systqmp 86145 248345 0 0 3 0x14200 bored systq 31195 5329 0 0 3 0x40014200 bored softclock 79862 493717 0 0 3 0x40014200 idle0 1 57729 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 10179 6407K 7122K 78643K 13985 0 pcb 13 10K 11K 78643K 104 0 rtable 217 6K 10K 78643K 591 0 ifaddr 78 16K 20K 78643K 227 0 counters 27 17K 17K 78643K 47 0 ioctlops 0 0K 4K 78643K 298 0 iov 0 0K 24K 78643K 163 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1335 83K 84K 78643K 2070 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 20 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 507 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 77K 78643K 1663 0 sigio 0 0K 0K 78643K 82 0 proc 62 59K 75K 78643K 638 0 subproc 91 5K 6K 78643K 156 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 51 0 in_multi 88 5K 7K 78643K 192 0 ether_multi 1 0K 0K 78643K 18 0 mrt 1 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 157 705K 705K 78643K 157 0 exec 0 0K 2K 78643K 930 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 230 219K 242K 78643K 10316 0 UVM aobj 77 3K 3K 78643K 83 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 62 0 NDP 11 0K 2K 78643K 55 0 temp 139 4752K 4816K 78643K 25432 0 kqueue 12 18K 28K 78643K 134 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 62 0 59 1 0 1 1 0 8 0 rtentry 112 167 0 66 4 0 4 4 0 8 0 unpcb 136 1166 0 1153 15 14 1 6 0 8 0 syncache 296 15 0 15 3 3 0 1 0 8 0 tcpqe 32 77 0 77 3 3 0 1 0 8 0 tcpcb 736 811 0 739 21 14 7 9 0 8 0 arp 88 27 0 11 1 0 1 1 0 8 0 inpcb 312 1427 0 1420 18 12 6 7 0 8 5 nd6 48 39 0 16 1 0 1 1 0 8 0 kcovpl 48 12 0 5 1 0 1 1 0 8 0 ppxss 1152 6 0 6 1 1 0 1 0 8 0 pfosfp 40 4 0 3 1 0 1 1 0 8 0 pfosfpen 112 4 0 3 1 0 1 1 0 8 0 pfrktable 1344 45 0 45 5 5 0 1 0 8 0 pftag 88 3 0 2 1 0 1 1 0 8 0 pfrule 1360 41 0 41 6 6 0 2 0 8 0 rttmrq 48 12 0 8 1 0 1 1 0 8 0 rttmr 72 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 646 0 226 29 0 29 29 0 8 0 art_table 32 647 0 226 4 0 4 4 0 8 0 art_node 16 166 0 74 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 505 0 495 1 0 1 1 0 8 0 shmpl 112 80 0 6 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3338 0 1903 90 0 90 90 0 8 0 ffsino 240 3338 0 1903 85 0 85 85 0 8 0 nchpl 144 5560 0 3925 63 0 63 63 0 8 0 uvmvnodes 80 4145 0 0 85 0 85 85 0 8 0 vnodes 224 4145 0 0 244 0 244 244 0 8 0 namei 1024 20200 0 20200 4 3 1 2 0 8 1 vcpupl 1984 11 0 1 2 0 2 2 0 8 0 vmpool 528 11 0 1 1 0 1 1 0 8 0 pfiaddrpl 120 19 0 19 5 5 0 1 0 8 0 kstatmem 264 62 0 40 3 1 2 3 0 8 0 scxspl 216 20521 0 20521 12 11 1 8 0 8 1 plimitpl 152 270 0 256 1 0 1 1 0 8 0 sigapl 424 1951 0 1892 10 2 8 8 0 8 0 futexpl 64 15772 0 15771 4 3 1 1 0 8 0 knotepl 120 30036 0 29956 21 16 5 17 0 8 0 kqueuepl 184 397 0 389 6 5 1 4 0 8 0 pipepl 304 544 0 516 13 10 3 8 0 8 0 fdescpl 432 1917 0 1893 4 0 4 4 0 8 0 filepl 120 12236 0 12019 19 9 10 14 0 8 2 lockfpl 104 417 0 415 3 2 1 2 0 8 0 lockfspl 48 71 0 69 1 0 1 1 0 8 0 sessionpl 144 27 0 11 1 0 1 1 0 8 0 pgrppl 48 29 0 13 1 0 1 1 0 8 0 ucredpl 96 717 0 707 1 0 1 1 0 8 0 zombiepl 144 1893 0 1892 1 0 1 1 0 8 0 processpl 1000 1951 0 1892 8 0 8 8 0 8 0 procpl 672 4349 0 4280 10 3 7 8 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 448 2658 0 2635 50 39 11 18 0 8 8 mcl64k 65536 31 0 31 4 4 0 1 0 8 0 mcl16k 16384 6 0 6 4 4 0 1 0 8 0 mcl12k 12288 16 0 16 5 5 0 1 0 8 0 mcl9k 9216 55 0 55 4 4 0 1 0 8 0 mcl8k 8192 61 0 61 3 3 0 1 0 8 0 mcl4k 4096 202 0 202 6 6 0 1 0 8 0 mcl2k2 2112 8 0 8 3 3 0 1 0 8 0 mcl2k 2048 73935 0 73885 15 7 8 11 0 8 0 mtagpl 96 362 0 143 7 1 6 6 0 8 0 mbufpl 256 126969 0 126559 31 4 27 27 0 8 0 bufpl 288 7181 0 777 458 0 458 458 0 8 0 anonpl 24 356882 0 341718 136 21 115 134 0 188 1 amapchunkpl 152 41880 0 41321 43 17 26 38 0 158 0 amappl16 200 4955 0 4306 49 13 36 47 0 8 1 amappl15 192 424 0 423 1 0 1 1 0 8 0 amappl14 184 370 0 364 1 0 1 1 0 8 0 amappl13 176 148 0 146 1 0 1 1 0 8 0 amappl12 168 407 0 401 2 1 1 1 0 8 0 amappl11 160 448 0 430 1 0 1 1 0 8 0 amappl10 152 18 0 16 1 0 1 1 0 8 0 amappl9 144 612 0 605 1 0 1 1 0 8 0 amappl8 136 617 0 566 2 0 2 2 0 8 0 amappl7 128 120 0 109 1 0 1 1 0 8 0 amappl6 120 344 0 326 2 1 1 2 0 8 0 amappl5 112 840 0 830 1 0 1 1 0 8 0 amappl4 104 1743 0 1709 2 1 1 2 0 8 0 amappl3 96 5185 0 5150 3 1 2 2 0 8 1 amappl2 88 2499 0 2439 3 1 2 3 0 8 0 amappl1 80 46912 0 46371 19 5 14 19 0 8 0 amappl 88 9748 0 9616 4 0 4 4 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 82 0 6 2 0 2 2 0 8 0 uaddrrnd 24 1928 0 1894 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1928 0 1894 1 0 1 1 0 8 0 vmmpekpl 168 17616 0 17560 3 0 3 3 0 8 0 vmmpepl 168 187503 0 185183 161 31 130 135 0 357 11 vmsppl 272 1927 0 1893 5 2 3 3 0 8 0 rwobjpl 24 49657 0 43904 37 1 36 36 0 8 0 pdppl 4096 3862 0 3796 190 118 72 75 0 8 6 pvpl 32 802216 0 783819 271 63 208 230 0 265 20 pmappl 216 1927 0 1893 3 0 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1026 0 224 24 0 24 24 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace pmap_page_remove(fffffd8005f96080) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005f96080) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959 uvm_anfree_list(fffffd80682b3690,ffff8000215ae1b8) at uvm_anfree_list+0x98 amap_wipeout(fffffd806f93ecc0) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff8000215ae280,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1599 uvm_map_teardown(fffffd8072b0faa8) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2791 uvmspace_free(fffffd8072b0faa8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffefc0) at reaper+0x15d sys/kern/kern_exit.c:454 end trace frame: 0x0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace pmap_page_remove(fffffd8005f96080) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005f96080) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959 uvm_anfree_list(fffffd80682b3690,ffff8000215ae1b8) at uvm_anfree_list+0x98 amap_wipeout(fffffd806f93ecc0) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff8000215ae280,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1599 uvm_map_teardown(fffffd8072b0faa8) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2791 uvmspace_free(fffffd8072b0faa8) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3685 reaper(ffff8000ffffefc0) at reaper+0x15d sys/kern/kern_exit.c:454 end trace frame: 0x0, count: -7