panic: uvmspace_fork: no space in map for entry in empty map Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *440419 56156 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 uvm_mapent_clone(ffff800000a9cb00,48000,4000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000a9cb00,0,7,fffffd803f011000,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000a9cb00,0,7,fffffd803f011000,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800016b56618,ffff800014929b40) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000abc000,ffff800014929b40) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000abc000,ffff800014929b40) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd8036174410,c5005601,ffff800000abc000,1,fffffd803f7c6840,ffff800014929b40) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd802d5c1718,c5005601,ffff800000abc000,ffff800014929b40) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800014929b40,ffff80001697fa88,ffff80001697fad0) at sys_ioctl+0x5b9 syscall(ffff80001697fb50) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4cd8c51c6a0, count: 4 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 uvmspace_fork: no space in map for entry in empty map ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 uvm_mapent_clone(ffff800000a9cb00,48000,4000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000a9cb00,0,7,fffffd803f011000,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000a9cb00,0,7,fffffd803f011000,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800016b56618,ffff800014929b40) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000abc000,ffff800014929b40) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000abc000,ffff800014929b40) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd8036174410,c5005601,ffff800000abc000,1,fffffd803f7c6840,ffff800014929b40) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd802d5c1718,c5005601,ffff800000abc000,ffff800014929b40) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800014929b40,ffff80001697fa88,ffff80001697fad0) at sys_ioctl+0x5b9 syscall(ffff80001697fb50) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4cd8c51c6a0, count: -11 ddb> show registers rdi 0xffffffff810ba107 db_enter+0x17 rsi 0x227a __ALIGN_SIZE+0x127a rbp 0xffff80001697f4b0 rbx 0xffff80001697f560 rdx 0x227b __ALIGN_SIZE+0x127b rcx 0xffff800014957000 rax 0xffff800014957000 r8 0xffff80001697f470 r9 0x1 r10 0xffff800000a51780 r11 0x28b339a1a9d97b3d r12 0x3000000008 r13 0xffff80001697f4c0 r14 0x100 r15 0x1 rip 0xffffffff810ba108 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001697f4a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=440419 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000149298c8,0xffffffff82571c58 process=0xffff8000ffff7b10 user=0xffff80001697a000, vmspace=0xfffffd803f011000 estcpu=36, cpticks=51, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 56156 335917 86334 0 2 0 syz-executor.0 *56156 440419 86334 0 7 0x4000000 syz-executor.0 84228 331231 90491 0 2 0 syz-executor.1 84228 177391 90491 0 3 0x4000080 fsleep syz-executor.1 90491 516305 51682 0 3 0x82 nanosleep syz-executor.1 12437 229638 1 0 3 0x100083 ttyin getty 86334 41391 51682 0 3 0x82 nanosleep syz-executor.0 70596 508480 0 0 3 0x14200 bored sosplice 51682 229667 20125 0 3 0x82 thrsleep syz-fuzzer 51682 296343 20125 0 3 0x4000082 thrsleep syz-fuzzer 51682 386928 20125 0 3 0x4000082 thrsleep syz-fuzzer 51682 198517 20125 0 3 0x4000082 thrsleep syz-fuzzer 51682 14545 20125 0 3 0x4000082 kqread syz-fuzzer 51682 17921 20125 0 3 0x4000082 thrsleep syz-fuzzer 51682 296373 20125 0 3 0x4000082 thrsleep syz-fuzzer 51682 312424 20125 0 3 0x4000082 thrsleep syz-fuzzer 20125 184295 59105 0 3 0x10008a pause ksh 59105 156265 41701 0 3 0x92 select sshd 41701 371470 1 0 3 0x80 select sshd 40535 80056 77764 73 3 0x100090 kqread syslogd 77764 476686 1 0 3 0x100082 netio syslogd 50792 1774 1 77 3 0x100090 poll dhclient 48965 176757 1 0 3 0x80 poll dhclient 19069 131186 0 0 2 0x14200 zerothread 50466 234695 0 0 3 0x14200 aiodoned aiodoned 77735 361220 0 0 3 0x14200 syncer update 91754 157629 0 0 3 0x14200 cleaner cleaner 16855 207902 0 0 3 0x14200 reaper reaper 70748 516512 0 0 3 0x14200 pgdaemon pagedaemon 54941 167130 0 0 3 0x14200 bored crynlk 11377 37915 0 0 3 0x14200 bored crypto 8655 154475 0 0 3 0x40014200 acpi0 acpi0 6894 220273 0 0 3 0x14200 bored softnet 31290 75823 0 0 3 0x14200 bored systqmp 38160 384429 0 0 3 0x14200 bored systq 39031 217352 0 0 3 0x40014200 bored softclock 65088 444228 0 0 3 0x40014200 idle0 54240 464945 0 0 3 0x14200 bored smr 1 435197 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 Kern Lim devbuf 9536 7009K 7512K 78643K 12374 0 0 pcb 13 8K 8K 78643K 427 0 0 rtable 101 11K 12K 78643K 705 0 0 ifaddr 113 17K 18K 78643K 275 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 1 2K 2K 78643K 77 0 0 iov 0 0K 16K 78643K 203 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1208 76K 77K 78643K 1897 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 18 0 0 VM map 11 2K 2K 78643K 11 0 0 sem 12 0K 1K 78643K 239 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1794 195K 288K 78643K 12646 0 0 file desc 6 17K 25K 78643K 943 0 0 sigio 0 0K 0K 78643K 48 0 0 proc 49 38K 63K 78643K 566 0 0 subproc 32 2K 2K 78643K 85 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 61 0 0 in_multi 74 3K 4K 78643K 156 0 0 ether_multi 1 0K 0K 78643K 9 0 0 mrt 0 0K 0K 78643K 6 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 66 291K 291K 78643K 66 0 0 exec 0 0K 1K 78643K 323 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 124 87K 91K 78643K 3181 0 0 UVM aobj 52 6K 6K 78643K 60 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 196 0 0 NDP 16 0K 0K 78643K 58 0 0 temp 150 3535K 4175K 78643K 23719 0 0 kqueue 0 0K 0K 78643K 12 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 23 0 18 1 0 1 1 0 8 0 rtpcb 80 107 0 105 1 0 1 1 0 8 0 rtentry 112 129 0 93 2 0 2 2 0 8 0 unpcb 120 985 0 974 4 3 1 2 0 8 0 syncache 264 9 0 9 3 3 0 1 0 8 0 tcpqe 32 170 0 170 3 3 0 1 0 8 0 tcpcb 544 363 0 357 2 1 1 2 0 8 0 ipq 40 15 0 15 4 3 1 1 0 8 1 ipqe 40 507 0 507 4 3 1 1 0 8 1 inpcb 280 1469 0 1457 6 4 2 3 0 8 1 rttmr 72 3 0 2 2 1 1 1 0 8 0 nd6 48 13 0 11 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 17 0 17 3 2 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 558 0 355 16 0 16 16 0 8 3 art_table 32 559 0 355 3 0 3 3 0 8 1 art_node 16 128 0 95 1 0 1 1 0 8 0 sysvmsgpl 40 33 0 25 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 230 0 220 1 0 1 1 0 8 0 shmpl 112 58 0 8 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3109 0 1712 46 0 46 46 0 8 0 ffsino 240 3109 0 1712 83 0 83 83 0 8 0 nchpl 144 4812 0 3208 61 0 61 61 0 8 0 uvmvnodes 72 3605 0 0 66 0 66 66 0 8 0 vnodes 208 3605 0 0 190 0 190 190 0 8 0 namei 1024 15573 0 15573 2 1 1 1 0 8 1 vcpupl 1984 8 0 0 1 0 1 1 0 8 0 vmpool 520 9 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 15049 0 15049 12 10 2 7 0 8 2 plimitpl 152 61 0 54 1 0 1 1 0 8 0 sigapl 432 1105 0 1091 2 0 2 2 0 8 0 futexpl 56 29909 0 29908 2 1 1 1 0 8 0 knotepl 112 204 0 185 1 0 1 1 0 8 0 kqueuepl 104 253 0 248 1 0 1 1 0 8 0 pipepl 128 726 0 707 4 2 2 2 0 8 1 fdescpl 424 1106 0 1091 2 0 2 2 0 8 0 filepl 120 10280 0 10168 11 6 5 6 0 8 1 lockfpl 104 1793 0 1790 1 0 1 1 0 8 0 lockfspl 48 421 0 418 1 0 1 1 0 8 0 sessionpl 112 21 0 11 1 0 1 1 0 8 0 pgrppl 48 25 0 15 1 0 1 1 0 8 0 ucredpl 96 1106 0 1099 1 0 1 1 0 8 0 zombiepl 144 1091 0 1091 1 0 1 1 0 8 1 processpl 864 1121 0 1091 4 0 4 4 0 8 0 procpl 632 2288 0 2249 5 1 4 5 0 8 0 sosppl 128 25 0 25 2 1 1 1 0 8 1 sockpl 384 2604 0 2579 16 12 4 6 0 8 1 mcl64k 65536 92 0 92 3 2 1 1 0 8 1 mcl16k 16384 12 0 12 6 5 1 1 0 8 1 mcl12k 12288 35 0 35 3 2 1 1 0 8 1 mcl9k 9216 12 0 12 4 4 0 1 0 8 0 mcl8k 8192 49 0 49 2 1 1 1 0 8 1 mcl4k 4096 97 0 97 3 2 1 1 0 8 1 mcl2k2 2112 8 0 8 5 4 1 1 0 8 1 mcl2k 2048 71544 0 71500 18 11 7 14 0 8 1 mtagpl 80 52 0 51 2 1 1 1 0 8 0 mbufpl 256 124473 0 124392 80 63 17 37 0 8 10 bufpl 256 10064 0 4887 325 0 325 325 0 8 0 anonpl 16 152919 0 130474 114 13 101 101 0 62 10 amapchunkpl 152 5457 0 5272 20 10 10 11 0 158 2 amappl16 192 6854 0 5418 100 28 72 73 0 8 0 amappl15 184 558 0 556 1 0 1 1 0 8 0 amappl14 176 177 0 172 1 0 1 1 0 8 0 amappl13 168 452 0 450 1 0 1 1 0 8 0 amappl12 160 23 0 21 2 1 1 1 0 8 0 amappl11 152 56 0 45 1 0 1 1 0 8 0 amappl10 144 11 0 9 1 0 1 1 0 8 0 amappl9 136 589 0 585 1 0 1 1 0 8 0 amappl8 128 197 0 168 1 0 1 1 0 8 0 amappl7 120 49 0 43 1 0 1 1 0 8 0 amappl6 112 57 0 48 1 0 1 1 0 8 0 amappl5 104 235 0 223 1 0 1 1 0 8 0 amappl4 96 1586 0 1557 1 0 1 1 0 8 0 amappl3 88 273 0 267 1 0 1 1 0 8 0 amappl2 80 8341 0 8266 3 1 2 3 0 8 0 amappl1 72 28907 0 28482 25 16 9 20 0 8 0 amappl 80 2587 0 2535 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 59 0 8 1 0 1 1 0 8 0 uaddrrnd 24 1115 0 1091 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1115 0 1091 1 0 1 1 0 8 0 vmmpekpl 168 11193 0 11162 2 0 2 2 0 8 0 vmmpepl 168 140225 0 137609 216 69 147 147 0 357 33 vmsppl 272 1105 0 1091 2 1 1 2 0 8 0 pdppl 4096 2236 0 2190 7 1 6 6 0 8 0 pvpl 32 385268 0 359067 259 26 233 233 0 265 21 pmappl 200 1114 0 1091 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 555 0 90 14 0 14 14 0 8 0