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 *258973 5072 0 0 0x4000000 0 syz-executor.1 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(ffff800000a8b700,f000,1f0000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000a8b700,0,7,fffffd803f011550,20001000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000a8b700,0,7,fffffd803f011550,20001000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800017b6da68,ffff8000ffff2c70) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000ace800,ffff8000ffff2c70) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000ace800,ffff8000ffff2c70) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd8036a87410,c5005601,ffff800000ace800,1,fffffd803f7c6a80,ffff8000ffff2c70) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd802da5b4c8,c5005601,ffff800000ace800,ffff8000ffff2c70) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff8000ffff2c70,ffff8000149141f8,ffff800014914240) at sys_ioctl+0x5b9 syscall(ffff8000149142c0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x965d8a299b0, 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(ffff800000a8b700,f000,1f0000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000a8b700,0,7,fffffd803f011550,20001000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000a8b700,0,7,fffffd803f011550,20001000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800017b6da68,ffff8000ffff2c70) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000ace800,ffff8000ffff2c70) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000ace800,ffff8000ffff2c70) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd8036a87410,c5005601,ffff800000ace800,1,fffffd803f7c6a80,ffff8000ffff2c70) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd802da5b4c8,c5005601,ffff800000ace800,ffff8000ffff2c70) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff8000ffff2c70,ffff8000149141f8,ffff800014914240) at sys_ioctl+0x5b9 syscall(ffff8000149142c0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x965d8a299b0, count: -11 ddb> show registers rdi 0xffffffff810b81b7 db_enter+0x17 rsi 0x22d2 __ALIGN_SIZE+0x12d2 rbp 0xffff800014913c20 rbx 0xffff800014913cd0 rdx 0x22d3 __ALIGN_SIZE+0x12d3 rcx 0xffff800014947000 rax 0xffff800014947000 r8 0xffff800014913be0 r9 0x1 r10 0xffff800000adaa40 r11 0x44f4f8169c8684b5 r12 0x3000000008 r13 0xffff800014913c30 r14 0x100 r15 0x1 rip 0xffffffff810b81b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014913c10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=258973 stat=onproc flags process=0 proc=4000000 pri=83, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff2018,0xffffffff82578840 process=0xffff8000ffff70f0 user=0xffff80001490f000, vmspace=0xfffffd803f011550 estcpu=33, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 5072 505758 14499 0 2 0 syz-executor.1 * 5072 258973 14499 0 7 0x4000000 syz-executor.1 90671 424293 12164 0 2 0 syz-executor.0 90671 121509 12164 0 2 0x4000000 syz-executor.0 46410 375516 0 0 3 0x14200 bored sosplice 14499 74721 50010 0 3 0x82 nanosleep syz-executor.1 89437 95911 0 0 3 0x14200 acct acct 12164 358487 50010 0 3 0x82 nanosleep syz-executor.0 50010 312378 96310 0 3 0x82 thrsleep syz-fuzzer 50010 77360 96310 0 3 0x4000082 thrsleep syz-fuzzer 50010 363091 96310 0 3 0x4000082 thrsleep syz-fuzzer 50010 107725 96310 0 3 0x4000082 thrsleep syz-fuzzer 50010 411199 96310 0 3 0x4000082 thrsleep syz-fuzzer 50010 349814 96310 0 3 0x4000082 kqread syz-fuzzer 50010 413426 96310 0 3 0x4000082 thrsleep syz-fuzzer 50010 157598 96310 0 3 0x4000082 thrsleep syz-fuzzer 96310 454403 8343 0 3 0x10008a pause ksh 8343 28659 16364 0 3 0x92 select sshd 40520 52253 1 0 3 0x100083 ttyin getty 16364 218170 1 0 3 0x80 select sshd 9384 457473 35477 73 3 0x100090 kqread syslogd 35477 131334 1 0 3 0x100082 netio syslogd 68419 171777 1 77 3 0x100090 poll dhclient 90032 440192 1 0 3 0x80 poll dhclient 634 243851 0 0 2 0x14200 zerothread 78127 452518 0 0 3 0x14200 aiodoned aiodoned 52512 76971 0 0 3 0x14200 syncer update 73295 301654 0 0 3 0x14200 cleaner cleaner 14170 82318 0 0 3 0x14200 reaper reaper 9149 523371 0 0 3 0x14200 pgdaemon pagedaemon 45810 368035 0 0 3 0x14200 bored crynlk 58279 80471 0 0 3 0x14200 bored crypto 57443 63418 0 0 3 0x40014200 acpi0 acpi0 77057 358823 0 0 3 0x14200 bored softnet 28845 90346 0 0 3 0x14200 bored systqmp 84572 452243 0 0 3 0x14200 bored systq 76293 403604 0 0 3 0x40014200 bored softclock 29933 187486 0 0 3 0x40014200 idle0 48203 40507 0 0 3 0x14200 bored smr 1 387806 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 9460 6326K 7367K 78643K 13216 0 0 pcb 13 8K 8K 78643K 336 0 0 rtable 88 3K 4K 78643K 292 0 0 ifaddr 50 10K 11K 78643K 98 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 1 2K 2K 78643K 29 0 0 iov 0 0K 16K 78643K 30 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1227 77K 77K 78643K 1904 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 6 0 0 VM map 4 1K 1K 78643K 4 0 0 sem 11 1K 1K 78643K 11 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1794 195K 288K 78643K 12646 0 0 file desc 6 17K 25K 78643K 667 0 0 sigio 0 0K 0K 78643K 2 0 0 proc 48 38K 63K 78643K 409 0 0 subproc 32 2K 2K 78643K 51 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 24 0 0 in_multi 46 2K 2K 78643K 71 0 0 ether_multi 1 0K 0K 78643K 2 0 0 mrt 0 0K 0K 78643K 3 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 54 238K 238K 78643K 54 0 0 exec 0 0K 1K 78643K 512 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 110 38K 38K 78643K 2736 0 0 UVM aobj 21 2K 2K 78643K 25 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 27 0 0 NDP 6 0K 0K 78643K 22 0 0 temp 110 3530K 3594K 78643K 28730 0 0 kqueue 0 0K 0K 78643K 2 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 8 0 4 1 0 1 1 0 8 0 rtpcb 80 29 0 27 1 0 1 1 0 8 0 rtentry 112 60 0 26 2 0 2 2 0 8 0 unpcb 120 83 0 75 1 0 1 1 0 8 0 syncache 264 5 0 5 2 2 0 1 0 8 0 tcpqe 32 82 0 82 1 1 0 1 0 8 0 tcpcb 544 88 0 84 1 0 1 1 0 8 0 inpcb 280 2114 0 2105 6 4 2 2 0 8 1 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 7 0 5 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 5 0 5 3 2 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 283 0 114 14 3 11 14 0 8 0 art_table 32 284 0 114 2 0 2 2 0 8 0 art_node 16 59 0 28 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 6 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 23 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2429 0 1031 46 0 46 46 0 8 0 ffsino 240 2429 0 1031 83 0 83 83 0 8 0 nchpl 144 4275 0 2677 60 0 60 60 0 8 0 uvmvnodes 72 2828 0 0 52 0 52 52 0 8 0 vnodes 208 2828 0 0 149 0 149 149 0 8 0 namei 1024 16275 0 16275 2 1 1 1 0 8 1 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 520 2 0 0 1 0 1 1 0 8 0 scxspl 192 9476 0 9476 8 7 1 7 0 8 1 plimitpl 152 37 0 30 1 0 1 1 0 8 0 sigapl 432 834 0 820 2 0 2 2 0 8 0 futexpl 56 35771 0 35771 2 1 1 1 0 8 1 knotepl 112 78 0 59 1 0 1 1 0 8 0 kqueuepl 104 26 0 24 1 0 1 1 0 8 0 pipepl 128 762 0 741 2 0 2 2 0 8 1 fdescpl 424 835 0 820 2 0 2 2 0 8 0 filepl 120 11550 0 11449 5 0 5 5 0 8 1 lockfpl 104 107 0 106 1 0 1 1 0 8 0 lockfspl 48 37 0 36 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 18 0 8 1 0 1 1 0 8 0 ucredpl 96 3089 0 3082 1 0 1 1 0 8 0 zombiepl 144 820 0 820 1 0 1 1 0 8 1 processpl 864 851 0 820 4 0 4 4 0 8 0 procpl 632 1952 0 1912 5 1 4 5 0 8 0 sockpl 384 2231 0 2212 6 2 4 4 0 8 2 mcl64k 65536 260 0 260 34 34 0 33 0 8 0 mcl16k 16384 5 0 5 3 3 0 1 0 8 0 mcl12k 12288 252 0 252 7 6 1 1 0 8 1 mcl9k 9216 29 0 29 10 9 1 1 0 8 1 mcl8k 8192 11 0 11 4 4 0 1 0 8 0 mcl4k 4096 64 0 64 17 16 1 1 0 8 1 mcl2k2 2112 5 0 5 3 3 0 1 0 8 0 mcl2k 2048 71661 0 71614 27 20 7 15 0 8 0 mtagpl 80 6 0 4 3 2 1 1 0 8 0 mbufpl 256 119359 0 119287 26 18 8 21 0 8 0 bufpl 256 8403 0 2683 368 7 361 368 0 8 0 anonpl 16 217622 0 197295 161 66 95 99 0 62 0 amapchunkpl 152 4533 0 4381 14 7 7 14 0 158 0 amappl16 192 11544 0 10400 245 183 62 70 0 8 4 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 247 0 241 1 0 1 1 0 8 0 amappl12 160 339 0 337 2 1 1 1 0 8 0 amappl11 152 152 0 140 1 0 1 1 0 8 0 amappl10 144 8 0 7 1 0 1 1 0 8 0 amappl9 136 573 0 570 1 0 1 1 0 8 0 amappl8 128 155 0 132 1 0 1 1 0 8 0 amappl7 120 38 0 35 1 0 1 1 0 8 0 amappl6 112 145 0 136 1 0 1 1 0 8 0 amappl5 104 480 0 466 1 0 1 1 0 8 0 amappl4 96 520 0 497 1 0 1 1 0 8 0 amappl3 88 1127 0 1115 1 0 1 1 0 8 0 amappl2 80 5824 0 5748 3 1 2 3 0 8 0 amappl1 72 25942 0 25518 27 18 9 20 0 8 0 amappl 80 2240 0 2193 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 24 0 4 1 0 1 1 0 8 0 uaddrrnd 24 837 0 820 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 837 0 820 1 0 1 1 0 8 0 vmmpekpl 168 11198 0 11173 2 0 2 2 0 8 0 vmmpepl 168 115498 0 113193 272 164 108 145 0 357 7 vmsppl 272 834 0 820 3 2 1 2 0 8 0 pdppl 4096 1680 0 1641 6 1 5 6 0 8 0 pvpl 32 587207 0 563744 377 153 224 233 0 265 18 pmappl 200 836 0 820 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 594 0 111 16 1 15 16 0 8 0