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 *373959 71992 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(ffff800000b2f900,ee000,3000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b2f900,0,7,fffffd803f011aa0,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b2f900,0,7,fffffd803f011aa0,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800015960a30,ffff8000ffff2ee8) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000aeb800,ffff8000ffff2ee8) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000aeb800,ffff8000ffff2ee8) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd80383808f0,c5005601,ffff800000aeb800,1,fffffd803f7c6a80,ffff8000ffff2ee8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd8037561078,c5005601,ffff800000aeb800,ffff8000ffff2ee8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff8000ffff2ee8,ffff800015344778,ffff8000153447c0) at sys_ioctl+0x5b9 syscall(ffff800015344840) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1cae2a95f70, 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(ffff800000b2f900,ee000,3000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b2f900,0,7,fffffd803f011aa0,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b2f900,0,7,fffffd803f011aa0,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800015960a30,ffff8000ffff2ee8) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000aeb800,ffff8000ffff2ee8) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000aeb800,ffff8000ffff2ee8) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd80383808f0,c5005601,ffff800000aeb800,1,fffffd803f7c6a80,ffff8000ffff2ee8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd8037561078,c5005601,ffff800000aeb800,ffff8000ffff2ee8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff8000ffff2ee8,ffff800015344778,ffff8000153447c0) at sys_ioctl+0x5b9 syscall(ffff800015344840) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1cae2a95f70, count: -11 ddb> show registers rdi 0xffffffff810ba107 db_enter+0x17 rsi 0x21d6 __ALIGN_SIZE+0x11d6 rbp 0xffff8000153441a0 rbx 0xffff800015344250 rdx 0x21d7 __ALIGN_SIZE+0x11d7 rcx 0xffff800015351000 rax 0xffff800015351000 r8 0xffff800015344160 r9 0x1 r10 0xffff800000a9f380 r11 0xee84f4d969c96faf r12 0x3000000008 r13 0xffff8000153441b0 r14 0x100 r15 0x1 rip 0xffffffff810ba108 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800015344190 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=373959 stat=onproc flags process=0 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff33d8,0xffffffff82571c58 process=0xffff8000ffff70f0 user=0xffff80001533f000, vmspace=0xfffffd803f011aa0 estcpu=31, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 93248 483359 46450 0 2 0 syz-executor.1 93248 465550 46450 0 3 0x4000080 fsleep syz-executor.1 71992 490645 36968 0 2 0 syz-executor.0 71992 29517 36968 0 2 0x4000000 syz-executor.0 *71992 373959 36968 0 7 0x4000000 syz-executor.0 46450 448862 19991 0 3 0x82 nanosleep syz-executor.1 36968 360466 19991 0 3 0x82 nanosleep syz-executor.0 82343 439172 0 0 3 0x14200 bored sosplice 35017 330457 0 0 3 0x14200 acct acct 90268 293414 1 0 3 0x100083 ttyopn getty 19991 357027 3234 0 3 0x82 thrsleep syz-fuzzer 19991 109360 3234 0 3 0x4000082 thrsleep syz-fuzzer 19991 137210 3234 0 3 0x4000082 thrsleep syz-fuzzer 19991 223495 3234 0 3 0x4000082 thrsleep syz-fuzzer 19991 214213 3234 0 3 0x4000082 kqread syz-fuzzer 19991 192510 3234 0 3 0x4000082 thrsleep syz-fuzzer 19991 445516 3234 0 3 0x4000082 thrsleep syz-fuzzer 19991 55002 3234 0 3 0x4000082 thrsleep syz-fuzzer 3234 86439 68619 0 3 0x10008a pause ksh 68619 489313 94671 0 3 0x92 select sshd 94671 390842 1 0 3 0x80 select sshd 1634 343581 68129 73 3 0x100090 kqread syslogd 68129 104428 1 0 3 0x100082 netio syslogd 26955 459867 0 0 2 0x14200 zerothread 93674 524279 0 0 3 0x14200 aiodoned aiodoned 25697 35746 0 0 3 0x14200 syncer update 24201 208719 0 0 3 0x14200 cleaner cleaner 36420 197254 0 0 3 0x14200 reaper reaper 23060 326360 0 0 3 0x14200 pgdaemon pagedaemon 90295 187817 0 0 3 0x14200 bored crynlk 34149 237599 0 0 3 0x14200 bored crypto 55055 337028 0 0 3 0x40014200 acpi0 acpi0 77469 448108 0 0 3 0x14200 bored softnet 43415 341709 0 0 3 0x14200 bored systqmp 12791 371338 0 0 3 0x14200 bored systq 70025 125461 0 0 3 0x40014200 bored softclock 40453 284260 0 0 3 0x40014200 idle0 17221 321742 0 0 3 0x14200 bored smr 1 482034 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 9559 6325K 7516K 78643K 15506 0 0 pcb 13 11K 12K 78643K 552 0 0 rtable 123 12K 14K 78643K 874 0 0 ifaddr 175 23K 24K 78643K 509 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 1 2K 2K 78643K 165 0 0 iov 0 0K 24K 78643K 431 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1223 77K 77K 78643K 3105 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 40 0 0 VM map 27 6K 6K 78643K 35 0 0 sem 12 1K 1K 78643K 14 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1794 195K 288K 78643K 12646 0 0 file desc 6 17K 25K 78643K 1980 0 0 sigio 1 0K 0K 78643K 102 0 0 proc 45 30K 63K 78643K 873 0 0 subproc 32 2K 2K 78643K 174 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 246 0 0 in_multi 86 5K 5K 78643K 334 0 0 ether_multi 1 0K 0K 78643K 23 0 0 mrt 0 0K 0K 78643K 25 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 132 583K 583K 78643K 132 0 0 exec 0 0K 1K 78643K 572 0 0 pfkey data 0 0K 4K 78643K 2 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 149 170K 170K 78643K 5745 0 0 UVM aobj 130 8K 8K 78643K 144 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 443 0 0 NDP 20 0K 0K 78643K 125 0 0 temp 167 3536K 3670K 78643K 78029 0 0 kqueue 0 0K 0K 78643K 51 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 41 0 34 1 0 1 1 0 8 0 rtpcb 80 903 0 903 2 1 1 1 0 8 1 rtentry 112 247 0 203 2 0 2 2 0 8 0 unpcb 120 1783 0 1776 1 0 1 1 0 8 0 syncache 264 11 0 11 5 5 0 1 0 8 0 tcpqe 32 28 0 28 5 5 0 1 0 8 0 tcpcb 544 1395 0 1390 27 25 2 13 0 8 1 ipq 40 34 0 34 7 7 0 1 0 8 0 ipqe 40 1278 0 1278 7 7 0 1 0 8 0 inpcb 280 3867 0 3862 25 21 4 9 0 8 3 rttmr 72 9 0 9 4 4 0 1 0 8 0 nd6 48 37 0 34 1 0 1 1 0 8 0 pkpcb 40 10 0 10 3 3 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 34 0 34 6 5 1 1 0 8 1 art_heap8 4096 6 0 3 6 3 3 4 0 8 0 art_heap4 256 1318 0 1074 27 9 18 18 0 8 1 art_table 32 1324 0 1077 4 1 3 3 0 8 0 art_node 16 246 0 205 1 0 1 1 0 8 0 sysvmsgpl 40 43 0 28 1 0 1 1 0 8 0 semapl 112 12 0 2 1 0 1 1 0 8 0 shmpl 112 142 0 14 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4623 0 3227 46 0 46 46 0 8 0 ffsino 240 4623 0 3227 83 0 83 83 0 8 0 nchpl 144 8316 0 7862 60 40 20 60 0 8 0 uvmvnodes 72 5976 0 0 109 0 109 109 0 8 0 vnodes 208 5976 0 0 315 0 315 315 0 8 0 namei 1024 27089 0 27089 2 1 1 1 0 8 1 vcpupl 1984 24 0 0 3 0 3 3 0 8 0 vmpool 520 33 0 8 2 0 2 2 0 8 0 scsiplug 64 3 0 3 3 3 0 1 0 8 0 scxspl 192 24348 0 24348 23 20 3 7 0 8 3 plimitpl 152 201 0 195 1 0 1 1 0 8 0 sigapl 432 2127 0 2115 2 0 2 2 0 8 0 futexpl 56 65851 0 65850 2 1 1 1 0 8 0 knotepl 112 3991 0 3972 3 1 2 2 0 8 1 kqueuepl 104 2647 0 2644 7 6 1 4 0 8 0 pipepl 128 1326 0 1307 4 3 1 2 0 8 0 fdescpl 424 2128 0 2115 2 0 2 2 0 8 0 filepl 120 22601 0 22515 21 16 5 11 0 8 2 lockfpl 104 752 0 752 2 1 1 1 0 8 1 lockfspl 48 263 0 263 2 1 1 1 0 8 1 sessionpl 112 26 0 18 1 0 1 1 0 8 0 pgrppl 48 127 0 119 1 0 1 1 0 8 0 ucredpl 96 2233 0 2226 1 0 1 1 0 8 0 zombiepl 144 2115 0 2115 1 0 1 1 0 8 1 processpl 864 2144 0 2115 4 0 4 4 0 8 0 procpl 632 4561 0 4522 4 0 4 4 0 8 0 sosppl 128 36 0 36 9 8 1 1 0 8 1 sockpl 384 6602 0 6590 35 29 6 14 0 8 4 mcl64k 65536 212 0 212 4 3 1 2 0 8 1 mcl16k 16384 36 0 36 7 6 1 1 0 8 1 mcl12k 12288 60 0 60 8 7 1 1 0 8 1 mcl9k 9216 29 0 29 9 8 1 1 0 8 1 mcl8k 8192 86 0 86 2 1 1 1 0 8 1 mcl4k 4096 262 0 262 3 2 1 1 0 8 1 mcl2k2 2112 19 0 19 10 9 1 1 0 8 1 mcl2k 2048 72283 0 72239 21 14 7 17 0 8 0 mtagpl 80 134 0 110 4 3 1 2 0 8 0 mbufpl 256 137459 0 137285 119 102 17 25 0 8 4 bufpl 256 13547 0 7331 389 0 389 389 0 8 0 anonpl 16 288649 0 263680 144 36 108 108 0 62 7 amapchunkpl 152 10783 0 10547 41 31 10 17 0 158 0 amappl16 192 14251 0 12848 148 73 75 78 0 8 4 amappl15 184 18 0 18 3 3 0 1 0 8 0 amappl14 176 101 0 96 1 0 1 1 0 8 0 amappl13 168 438 0 435 1 0 1 1 0 8 0 amappl12 160 213 0 211 2 1 1 1 0 8 0 amappl11 152 158 0 153 1 0 1 1 0 8 0 amappl10 144 540 0 536 1 0 1 1 0 8 0 amappl9 136 908 0 905 1 0 1 1 0 8 0 amappl8 128 506 0 463 3 1 2 2 0 8 0 amappl7 120 592 0 586 1 0 1 1 0 8 0 amappl6 112 149 0 136 1 0 1 1 0 8 0 amappl5 104 432 0 423 1 0 1 1 0 8 0 amappl4 96 2191 0 2164 1 0 1 1 0 8 0 amappl3 88 390 0 383 1 0 1 1 0 8 0 amappl2 80 16194 0 16121 3 1 2 3 0 8 0 amappl1 72 47241 0 46842 27 18 9 20 0 8 0 amappl 80 4958 0 4898 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 64 143 0 14 3 0 3 3 0 8 0 uaddrrnd 24 2161 0 2115 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2161 0 2115 1 0 1 1 0 8 0 vmmpekpl 168 16787 0 16758 2 0 2 2 0 8 0 vmmpepl 168 264055 0 261418 266 130 136 154 0 357 21 vmsppl 272 2127 0 2115 2 1 1 2 0 8 0 pdppl 4096 4328 0 4270 10 2 8 8 0 8 0 pvpl 32 725739 0 699164 335 76 259 276 0 265 44 pmappl 200 2160 0 2123 3 1 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 707 0 171 16 0 16 16 0 8 0