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 *211578 42553 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(ffff800000aa2600,5a000,3000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000aa2600,0,7,fffffd803f011550,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000aa2600,0,7,fffffd803f011550,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800017b5e618,ffff800014914780) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000a81800,ffff800014914780) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000a81800,ffff800014914780) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd803a30f8f0,c5005601,ffff800000a81800,1,fffffd803f7c6ae0,ffff800014914780) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd80299f65a8,c5005601,ffff800000a81800,ffff800014914780) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800014914780,ffff800017b58488,ffff800017b584d0) at sys_ioctl+0x5b9 syscall(ffff800017b58550) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6833f6b1f20, 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(ffff800000aa2600,5a000,3000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000aa2600,0,7,fffffd803f011550,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000aa2600,0,7,fffffd803f011550,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800017b5e618,ffff800014914780) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000a81800,ffff800014914780) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000a81800,ffff800014914780) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd803a30f8f0,c5005601,ffff800000a81800,1,fffffd803f7c6ae0,ffff800014914780) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd80299f65a8,c5005601,ffff800000a81800,ffff800014914780) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800014914780,ffff800017b58488,ffff800017b584d0) at sys_ioctl+0x5b9 syscall(ffff800017b58550) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6833f6b1f20, count: -11 ddb> show registers rdi 0xffffffff81d84667 db_enter+0x17 rsi 0x2200 __ALIGN_SIZE+0x1200 rbp 0xffff800017b57eb0 rbx 0xffff800017b57f60 rdx 0x2201 __ALIGN_SIZE+0x1201 rcx 0xffff800016543000 rax 0xffff800016543000 r8 0xffff800017b57e70 r9 0x1 r10 0xffff800000a66fc0 r11 0xffe09c20bb60a8c3 r12 0x3000000008 r13 0xffff800017b57ec0 r14 0x100 r15 0x1 rip 0xffffffff81d84668 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800017b57ea0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=211578 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800014915b40,0xffff800014914a08 process=0xffff8000148a26d8 user=0xffff800017b53000, vmspace=0xfffffd803f011550 estcpu=36, cpticks=47, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 77288 229037 8158 0 2 0 syz-executor.0 77288 224524 8158 0 3 0x4000080 fsleep syz-executor.0 42553 328349 90389 0 2 0 syz-executor.1 *42553 211578 90389 0 7 0x4000000 syz-executor.1 8158 50272 55309 0 3 0x82 nanosleep syz-executor.0 90389 469575 55309 0 3 0x82 nanosleep syz-executor.1 73198 261199 1 0 3 0x100083 ttyin getty 81478 485665 0 0 3 0x14200 bored sosplice 22 353186 0 0 3 0x14200 acct acct 55309 332813 8375 0 3 0x82 thrsleep syz-fuzzer 55309 196322 8375 0 3 0x4000082 thrsleep syz-fuzzer 55309 167764 8375 0 3 0x4000082 thrsleep syz-fuzzer 55309 115385 8375 0 3 0x4000082 thrsleep syz-fuzzer 55309 279351 8375 0 3 0x4000082 thrsleep syz-fuzzer 55309 28810 8375 0 3 0x4000082 kqread syz-fuzzer 55309 461944 8375 0 3 0x4000082 thrsleep syz-fuzzer 55309 421909 8375 0 3 0x4000082 thrsleep syz-fuzzer 8375 262960 82996 0 3 0x10008a pause ksh 82996 258470 69688 0 3 0x92 select sshd 69688 367405 1 0 3 0x80 select sshd 31386 129169 11855 73 3 0x100090 kqread syslogd 11855 108517 1 0 3 0x100082 netio syslogd 87988 485637 1 77 3 0x100090 poll dhclient 44879 474778 1 0 3 0x80 poll dhclient 99801 89217 0 0 2 0x14200 zerothread 67306 301956 0 0 3 0x14200 aiodoned aiodoned 93860 456093 0 0 3 0x14200 syncer update 70808 139781 0 0 3 0x14200 cleaner cleaner 58276 80109 0 0 3 0x14200 reaper reaper 25010 515635 0 0 3 0x14200 pgdaemon pagedaemon 43573 457088 0 0 3 0x14200 bored crynlk 75575 492637 0 0 3 0x14200 bored crypto 65807 278649 0 0 3 0x40014200 acpi0 acpi0 27864 460049 0 0 3 0x14200 bored softnet 78129 333255 0 0 3 0x14200 bored systqmp 21384 232131 0 0 3 0x14200 bored systq 35792 380633 0 0 3 0x40014200 bored softclock 77513 393889 0 0 3 0x40014200 idle0 18056 84551 0 0 3 0x14200 bored smr 1 460607 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 9527 6432K 6983K 78643K 12827 0 0 pcb 13 8K 8K 78643K 168 0 0 rtable 112 12K 12K 78643K 587 0 0 ifaddr 98 16K 16K 78643K 189 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 1 2K 2K 78643K 79 0 0 iov 0 0K 24K 78643K 165 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1218 77K 77K 78643K 1929 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 13 0 0 VM map 11 2K 2K 78643K 22 0 0 sem 12 1K 1K 78643K 223 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1794 195K 288K 78643K 12646 0 0 file desc 6 17K 25K 78643K 678 0 0 sigio 0 0K 0K 78643K 14 0 0 proc 48 38K 63K 78643K 606 0 0 subproc 32 2K 2K 78643K 104 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 105 0 0 in_multi 29 1K 2K 78643K 114 0 0 ether_multi 1 0K 0K 78643K 7 0 0 mrt 0 0K 0K 78643K 1 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 317 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 122 91K 96K 78643K 2646 0 0 UVM aobj 87 3K 3K 78643K 90 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 192 0 0 NDP 15 0K 0K 78643K 47 0 0 temp 146 3535K 3603K 78643K 23514 0 0 kqueue 0 0K 0K 78643K 6 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 20 0 14 1 0 1 1 0 8 0 rtpcb 80 99 0 97 1 0 1 1 0 8 0 rtentry 112 116 0 75 2 0 2 2 0 8 0 unpcb 120 640 0 632 2 1 1 2 0 8 0 syncache 264 7 0 7 2 2 0 1 0 8 0 tcpqe 32 116 0 116 2 2 0 1 0 8 0 tcpcb 544 315 0 311 3 1 2 2 0 8 1 ipq 40 8 0 8 3 3 0 1 0 8 0 ipqe 40 274 0 274 3 3 0 1 0 8 0 inpcb 280 952 0 945 5 3 2 2 0 8 1 rttmr 72 1 0 0 1 0 1 1 0 8 0 ip6q 72 3 0 2 1 0 1 1 0 8 0 ip6af 40 6 0 6 1 0 1 1 0 8 1 nd6 48 15 0 12 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 7 0 7 4 3 1 1 0 8 1 art_heap8 4096 5 0 4 3 2 1 3 0 8 0 art_heap4 256 533 0 306 19 4 15 15 0 8 0 art_table 32 538 0 310 2 0 2 2 0 8 0 art_node 16 115 0 77 1 0 1 1 0 8 0 sysvmsgpl 40 54 0 49 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 221 0 211 1 0 1 1 0 8 0 shmpl 112 88 0 3 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2394 0 997 46 0 46 46 0 8 0 ffsino 240 2394 0 997 83 0 83 83 0 8 0 nchpl 144 3862 0 2269 60 0 60 60 0 8 0 uvmvnodes 72 2986 0 0 55 0 55 55 0 8 0 vnodes 208 2986 0 0 158 0 158 158 0 8 0 namei 1024 12048 0 12048 2 1 1 1 0 8 1 vcpupl 1984 8 0 0 1 0 1 1 0 8 0 vmpool 520 20 0 11 1 0 1 1 0 8 0 scsiplug 64 2 0 2 1 1 0 1 0 8 0 scxspl 192 11627 0 11627 10 9 1 7 0 8 1 plimitpl 152 85 0 78 1 0 1 1 0 8 0 sigapl 432 837 0 823 2 0 2 2 0 8 0 futexpl 56 23502 0 23501 2 1 1 1 0 8 0 knotepl 112 462 0 443 1 0 1 1 0 8 0 kqueuepl 104 629 0 626 1 0 1 1 0 8 0 pipepl 128 1864 0 1845 5 3 2 3 0 8 1 fdescpl 424 838 0 823 2 0 2 2 0 8 0 filepl 120 9117 0 9018 9 4 5 6 0 8 1 lockfpl 104 250 0 249 1 0 1 1 0 8 0 lockfspl 48 85 0 84 1 0 1 1 0 8 0 sessionpl 112 22 0 12 1 0 1 1 0 8 0 pgrppl 48 115 0 105 1 0 1 1 0 8 0 ucredpl 96 847 0 840 1 0 1 1 0 8 0 zombiepl 144 823 0 823 1 0 1 1 0 8 1 processpl 864 854 0 823 4 0 4 4 0 8 0 procpl 632 1684 0 1644 5 1 4 5 0 8 0 sosppl 128 1 0 1 1 1 0 1 0 8 0 sockpl 384 1716 0 1698 10 6 4 6 0 8 1 mcl64k 65536 68 0 68 2 1 1 1 0 8 1 mcl16k 16384 9 0 9 3 2 1 1 0 8 1 mcl12k 12288 21 0 21 2 1 1 1 0 8 1 mcl9k 9216 15 0 15 3 2 1 1 0 8 1 mcl8k 8192 50 0 50 2 1 1 1 0 8 1 mcl4k 4096 81 0 81 3 2 1 1 0 8 1 mcl2k2 2112 7 0 7 3 3 0 1 0 8 0 mcl2k 2048 72059 0 72018 15 9 6 13 0 8 0 mtagpl 80 22 0 20 2 1 1 1 0 8 0 mbufpl 256 121195 0 121062 32 23 9 18 0 8 0 bufpl 256 8638 0 3663 312 0 312 312 0 8 0 anonpl 16 153179 0 131361 124 23 101 101 0 62 13 amapchunkpl 152 5207 0 4959 20 10 10 12 0 158 0 amappl16 192 6617 0 5281 96 29 67 71 0 8 0 amappl15 184 2 0 2 2 2 0 1 0 8 0 amappl14 176 81 0 74 1 0 1 1 0 8 0 amappl13 168 186 0 184 2 1 1 1 0 8 0 amappl12 160 74 0 74 2 1 1 1 0 8 1 amappl11 152 109 0 98 1 0 1 1 0 8 0 amappl10 144 10 0 7 1 0 1 1 0 8 0 amappl9 136 787 0 783 1 0 1 1 0 8 0 amappl8 128 359 0 329 2 0 2 2 0 8 0 amappl7 120 53 0 48 1 0 1 1 0 8 0 amappl6 112 113 0 101 1 0 1 1 0 8 0 amappl5 104 238 0 228 1 0 1 1 0 8 0 amappl4 96 1195 0 1164 1 0 1 1 0 8 0 amappl3 88 215 0 203 1 0 1 1 0 8 0 amappl2 80 5656 0 5581 3 1 2 3 0 8 0 amappl1 72 24886 0 24468 27 18 9 20 0 8 0 amappl 80 2027 0 1972 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 89 0 3 2 0 2 2 0 8 0 uaddrrnd 24 858 0 823 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 858 0 823 1 0 1 1 0 8 0 vmmpekpl 168 12453 0 12421 2 0 2 2 0 8 0 vmmpepl 168 111833 0 109307 199 54 145 145 0 357 35 vmsppl 272 837 0 823 2 1 1 2 0 8 0 pdppl 4096 1722 0 1676 7 1 6 6 0 8 0 pvpl 32 357065 0 331585 261 30 231 231 0 265 25 pmappl 200 857 0 834 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 493 0 50 13 0 13 13 0 8 0