uvm_fault(0xffffffff82a6df90, 0x7f843f93e530, 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 *347058 85728 0 0x14000 0x200 0 reaper pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959 uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98 amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607 uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808 uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707 reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462 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(0xffffffff82a6df90, 0x7f843f93e530, 0, 2) -> e ddb> trace pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959 uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98 amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607 uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808 uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707 reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff8000215be950 rbx 0 rdx 0 rcx 0x7f8000000000 rax 0 r8 0 r9 0 r10 0x6cd36b6a9ad3bfc1 r11 0x17413fca9e591f5d r12 0 r13 0xfffffd806bb91f28 r14 0x800000007f7cf000 r15 0x43f93e530 rip 0xffffffff813b220d pmap_page_remove+0x30d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000215be8c0 ss 0x10 pmap_page_remove+0x30d: xchgq %rax,0(%r15,%rcx,1) ddb> show proc PROC (reaper) pid=347058 stat=onproc flags process=14000 proc=200 pri=4, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffed20,0xffff8000fffff7b0 process=0xffff8000ffffa7d8 user=0xffff8000215b9000, vmspace=0xffffffff82a6df90 estcpu=1, cpticks=1, pctcpu=0.30 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 54065 246597 50263 0 2 0 syz-executor.3 21435 260756 38311 0 2 0 syz-executor.0 38148 488521 72335 0 2 0 syz-executor.6 67638 185672 5614 0 2 0 syz-executor.2 67638 325523 5614 0 3 0x4000080 fsleep syz-executor.2 50263 362171 58242 0 3 0x82 nanoslp syz-executor.3 31205 297474 58242 0 2 0x2 syz-executor.1 55334 164905 58242 0 3 0x82 nanoslp syz-executor.5 23598 137653 58242 0 3 0x82 nanoslp syz-executor.7 58028 432196 58242 0 3 0x2 biowait syz-executor.4 72335 228903 58242 0 3 0x82 nanoslp syz-executor.6 38311 129382 58242 0 3 0x82 nanoslp syz-executor.0 51644 183885 0 0 3 0x14200 bored sosplice 5614 385293 58242 0 3 0x82 nanoslp syz-executor.2 58242 307334 44865 0 3 0x82 thrsleep syz-fuzzer 58242 503666 44865 0 3 0x4000082 nanoslp syz-fuzzer 58242 373428 44865 0 3 0x4000082 thrsleep syz-fuzzer 58242 192520 44865 0 3 0x4000082 thrsleep syz-fuzzer 58242 421645 44865 0 3 0x4000082 kqread syz-fuzzer 58242 490348 44865 0 3 0x4000082 thrsleep syz-fuzzer 58242 32054 44865 0 3 0x4000082 thrsleep syz-fuzzer 58242 7117 44865 0 3 0x4000082 thrsleep syz-fuzzer 44865 77621 42740 0 3 0x10008a sigsusp ksh 42740 273736 86312 0 3 0x9a kqread sshd 6815 125664 1 0 3 0x100083 ttyin getty 86312 126519 1 0 3 0x88 kqread sshd 83184 380203 82809 73 3 0x100090 kqread syslogd 82809 141427 1 0 3 0x100082 netio syslogd 71804 454010 1 0 3 0x100080 kqread resolvd 57866 487643 88042 77 3 0x100092 kqread dhcpleased 6263 162410 88042 77 3 0x100092 kqread dhcpleased 88042 56894 1 0 3 0x80 kqread dhcpleased 43030 383125 0 0 3 0x14200 bored smr 96013 462008 0 0 2 0x14200 zerothread 65044 59942 0 0 3 0x14200 aiodoned aiodoned 88320 130149 0 0 3 0x14200 syncer update 54521 187784 0 0 3 0x14200 cleaner cleaner *85728 347058 0 0 7 0x14200 reaper 92628 385272 0 0 3 0x14200 pgdaemon pagedaemon 41502 312426 0 0 3 0x14200 bored viomb 8346 334393 0 0 3 0x40014200 acpi0 acpi0 51055 333003 0 0 3 0x14200 bored softnet 7078 96165 0 0 3 0x14200 bored systqmp 56671 332307 0 0 3 0x14200 bored systq 61481 500852 0 0 3 0x40014200 bored softclock 23436 25184 0 0 3 0x40014200 idle0 1 285162 0 0 3 0x80082 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 10173 6434K 7071K 78643K 18885 0 pcb 13 8K 9K 78643K 348 0 rtable 218 7K 10K 78643K 1027 0 ifaddr 78 16K 17K 78643K 319 0 sysctl 2 0K 0K 78643K 2 0 counters 26 17K 17K 78643K 60 0 ioctlops 0 0K 4K 78643K 659 0 iov 0 0K 16K 78643K 142 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1330 83K 83K 78643K 4079 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 36 0 VM map 2 0K 0K 78643K 2 0 sem 10 0K 1K 78643K 16 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 89K 78643K 7972 0 sigio 0 0K 0K 78643K 32 0 proc 69 55K 87K 78643K 945 0 subproc 104 6K 6K 78643K 286 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 239 0 in_multi 87 5K 6K 78643K 375 0 ether_multi 1 0K 0K 78643K 58 0 mrt 1 0K 0K 78643K 70 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 79 360K 360K 78643K 79 0 exec 0 0K 2K 78643K 1088 0 pfkey data 0 0K 0K 78643K 1 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 346 263K 329K 78643K 94779 0 UVM aobj 32 2K 2K 78643K 32 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 211 0 NDP 11 0K 2K 78643K 89 0 temp 126 4697K 4767K 78643K 30209 0 kqueue 12 18K 24K 78643K 261 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 120 116 0 113 1 0 1 1 0 8 0 rtentry 112 306 0 210 4 0 4 4 0 8 0 unpcb 136 1578 0 1565 8 7 1 5 0 8 0 syncache 296 33 0 33 8 8 0 1 0 8 0 tcpqe 32 17 0 17 6 6 0 1 0 8 0 tcpcb 736 817 0 813 26 25 1 7 0 8 0 arp 88 47 0 33 1 0 1 1 0 8 0 ipq 40 9 0 9 3 3 0 1 0 8 0 ipqe 40 313 0 313 3 3 0 1 0 8 0 inpcb 304 2111 0 2104 22 21 1 6 0 8 0 rttmr 72 19 0 19 1 1 0 1 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 1 0 1 1 1 0 1 0 8 0 nd6 48 68 0 46 1 0 1 1 0 8 0 pkpcb 40 36 0 36 4 4 0 1 0 8 0 kcovpl 48 22 0 14 1 0 1 1 0 8 0 ppxss 1152 13 0 13 4 4 0 1 0 8 0 pfstscr 40 13 0 13 1 1 0 1 0 8 0 pffrag 232 27 0 7 2 0 2 2 0 482 0 pffrnode 88 16 0 7 1 0 1 1 0 8 0 pffrent 40 166 0 146 1 0 1 1 0 8 0 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfrktable 1344 29 0 29 1 1 0 1 0 8 0 pftag 88 5 0 2 1 0 1 1 0 8 0 pfstitem 24 20 0 20 1 1 0 1 0 8 0 pfstkey 112 28 0 28 1 1 0 1 0 8 0 pfstate 320 14 0 14 1 1 0 1 0 8 0 pfrule 1360 59 0 53 3 2 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1107 0 695 35 9 26 29 0 8 0 art_table 32 1108 0 695 4 0 4 4 0 8 0 art_node 16 299 0 212 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 29 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 10665 0 9234 91 0 91 91 0 8 0 ffsino 240 10665 0 9234 86 0 86 86 0 8 0 nchpl 144 19558 0 17941 62 0 62 62 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 54075 0 54073 7 6 1 2 0 8 0 vcpupl 1984 15 0 4 2 0 2 2 0 8 0 vmpool 528 16 0 5 2 1 1 2 0 8 0 pfiaddrpl 120 8 0 8 1 1 0 1 0 8 0 scsiplug 72 6 0 6 1 1 0 1 0 8 0 scxspl 216 63925 0 63924 14 12 2 8 0 8 1 plimitpl 152 158 0 144 1 0 1 1 0 8 0 sigapl 424 8233 0 8194 6 1 5 6 0 8 0 futexpl 64 44235 0 44234 6 5 1 1 0 8 0 knotepl 120 65895 0 65815 6 3 3 4 0 8 0 kqueuepl 184 453 0 445 1 0 1 1 0 8 0 pipepl 304 427 0 399 3 0 3 3 0 8 0 fdescpl 432 8219 0 8194 4 0 4 4 0 8 0 filepl 120 24852 0 24617 27 16 11 12 0 8 3 lockfpl 104 599 0 597 1 0 1 1 0 8 0 lockfspl 48 190 0 188 1 0 1 1 0 8 0 sessionpl 144 37 0 21 1 0 1 1 0 8 0 pgrppl 48 61 0 45 1 0 1 1 0 8 0 ucredpl 96 5267 0 5257 1 0 1 1 0 8 0 zombiepl 144 8194 0 8192 1 0 1 1 0 8 0 processpl 1000 8233 0 8192 7 1 6 7 0 8 0 procpl 672 17132 0 17083 16 10 6 6 0 8 1 sosppl 168 64 0 64 8 8 0 1 0 8 0 sockpl 448 3843 0 3820 41 36 5 17 0 8 2 mcl64k 65536 159 0 159 9 8 1 2 0 8 1 mcl16k 16384 81 0 81 12 11 1 1 0 8 1 mcl12k 12288 103 0 103 11 10 1 1 0 8 1 mcl9k 9216 63 0 63 9 8 1 1 0 8 1 mcl8k 8192 349 0 349 12 11 1 1 0 8 1 mcl4k 4096 261 0 261 14 13 1 1 0 8 1 mcl2k2 2112 14 0 14 6 6 0 1 0 8 0 mcl2k 2048 31621 0 31544 44 32 12 14 0 8 0 mtagpl 96 1020 0 514 15 2 13 13 0 8 0 mbufpl 256 117060 0 116337 94 46 48 68 0 8 1 bufpl 288 14053 0 7645 458 0 458 458 0 8 0 anonpl 24 2083807 0 2074166 162 90 72 110 0 188 0 amapchunkpl 152 224570 0 224027 76 49 27 46 0 158 2 amappl16 200 18502 0 18239 86 71 15 32 0 8 0 amappl15 192 1656 0 1651 1 0 1 1 0 8 0 amappl14 184 1294 0 1290 1 0 1 1 0 8 0 amappl13 176 2086 0 2082 1 0 1 1 0 8 0 amappl12 168 1025 0 1021 1 0 1 1 0 8 0 amappl11 160 1342 0 1329 1 0 1 1 0 8 0 amappl10 152 1003 0 995 1 0 1 1 0 8 0 amappl9 144 796 0 791 1 0 1 1 0 8 0 amappl8 136 1681 0 1562 5 0 5 5 0 8 0 amappl7 128 794 0 784 1 0 1 1 0 8 0 amappl6 120 569 0 543 2 1 1 2 0 8 0 amappl5 112 6254 0 6241 1 0 1 1 0 8 0 amappl4 104 4480 0 4449 2 0 2 2 0 8 0 amappl3 96 2273 0 2259 1 0 1 1 0 8 0 amappl2 88 3022 0 2966 3 1 2 3 0 8 0 amappl1 80 138208 0 137698 27 14 13 18 0 8 1 amappl 88 93816 0 93617 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 31 0 0 1 0 1 1 0 8 0 uaddrrnd 24 8235 0 8199 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8235 0 8199 1 0 1 1 0 8 0 vmmpekpl 168 45270 0 45226 3 0 3 3 0 8 0 vmmpepl 168 710884 0 708820 179 74 105 113 0 357 6 vmsppl 272 8234 0 8198 4 1 3 3 0 8 0 rwobjpl 24 163275 0 156106 47 2 45 46 0 8 0 pdppl 4096 16476 0 16407 346 271 75 79 0 8 6 pvpl 32 3726825 0 3713253 405 278 127 257 0 265 0 pmappl 216 8234 0 8198 3 0 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1289 0 473 25 0 25 25 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959 uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98 amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607 uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808 uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707 reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959 uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98 amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607 uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808 uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707 reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462 end trace frame: 0x0, count: -7