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 *260047 4420 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(ffff800000b5fd00,f000,1f0000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b5fd00,0,7,fffffd803f012dd0,20001000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b5fd00,0,7,fffffd803f012dd0,20001000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff80001491ea30,ffff80001491d650) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000a94000,ffff80001491d650) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000a94000,ffff80001491d650) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd80360e8340,c5005601,ffff800000a94000,1,fffffd803f7c6b40,ffff80001491d650) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd8037561c30,c5005601,ffff800000a94000,ffff80001491d650) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff80001491d650,ffff800017982d08,ffff800017982d50) at sys_ioctl+0x5b9 syscall(ffff800017982dd0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe81eba5c2a0, 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(ffff800000b5fd00,f000,1f0000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b5fd00,0,7,fffffd803f012dd0,20001000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b5fd00,0,7,fffffd803f012dd0,20001000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff80001491ea30,ffff80001491d650) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000a94000,ffff80001491d650) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000a94000,ffff80001491d650) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd80360e8340,c5005601,ffff800000a94000,1,fffffd803f7c6b40,ffff80001491d650) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd8037561c30,c5005601,ffff800000a94000,ffff80001491d650) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff80001491d650,ffff800017982d08,ffff800017982d50) at sys_ioctl+0x5b9 syscall(ffff800017982dd0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe81eba5c2a0, count: -11 ddb> show registers rdi 0xffffffff817840c7 db_enter+0x17 rsi 0x2158 __ALIGN_SIZE+0x1158 rbp 0xffff800017982730 rbx 0xffff8000179827e0 rdx 0x2159 __ALIGN_SIZE+0x1159 rcx 0xffff800018947000 rax 0xffff800018947000 r8 0xffff8000179826f0 r9 0x1 r10 0xffff800000a8fb00 r11 0x4f31454fe05a3d39 r12 0x3000000008 r13 0xffff800017982740 r14 0x100 r15 0x1 rip 0xffffffff817840c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800017982720 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=260047 stat=onproc flags process=0 proc=4000000 pri=71, usrpri=71, nice=20 forw=0xffffffffffffffff, list=0xffff80001491d3d8,0xffffffff825b81a0 process=0xffff8000ffff6d90 user=0xffff80001797d000, vmspace=0xfffffd803f012dd0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 4420 116484 19558 0 2 0 syz-executor.0 * 4420 260047 19558 0 7 0x4000000 syz-executor.0 98657 489791 2602 0 2 0 syz-executor.1 98657 517314 2602 0 3 0x4000080 nanosleep syz-executor.1 2602 223390 25853 0 3 0x82 nanosleep syz-executor.1 19558 344311 25853 0 3 0x82 nanosleep syz-executor.0 64420 207761 0 0 3 0x14200 bored sosplice 80221 343373 0 0 3 0x14200 acct acct 25853 119755 92659 0 3 0x82 thrsleep syz-fuzzer 25853 513077 92659 0 3 0x4000082 thrsleep syz-fuzzer 25853 357620 92659 0 3 0x4000082 thrsleep syz-fuzzer 25853 462375 92659 0 3 0x4000082 thrsleep syz-fuzzer 25853 339391 92659 0 3 0x4000082 kqread syz-fuzzer 25853 511197 92659 0 3 0x4000082 thrsleep syz-fuzzer 25853 249376 92659 0 3 0x4000082 thrsleep syz-fuzzer 25853 439524 92659 0 3 0x4000082 thrsleep syz-fuzzer 92659 75564 63289 0 3 0x10008a pause ksh 63289 229558 29931 0 3 0x92 select sshd 10266 300240 1 0 3 0x100083 ttyin getty 29931 341854 1 0 3 0x80 select sshd 32023 523749 88410 73 3 0x100090 kqread syslogd 88410 91331 1 0 3 0x100082 netio syslogd 20102 405910 1 77 3 0x100090 poll dhclient 14082 93519 1 0 3 0x80 poll dhclient 94351 217601 0 0 2 0x14200 zerothread 14102 274238 0 0 3 0x14200 aiodoned aiodoned 99058 113488 0 0 3 0x14200 syncer update 70341 63837 0 0 3 0x14200 cleaner cleaner 88276 502019 0 0 3 0x14200 reaper reaper 11617 518545 0 0 3 0x14200 pgdaemon pagedaemon 19550 512833 0 0 3 0x14200 bored crynlk 12248 68885 0 0 3 0x14200 bored crypto 91585 386353 0 0 3 0x40014200 acpi0 acpi0 65830 450163 0 0 3 0x14200 bored softnet 25920 4502 0 0 3 0x14200 bored systqmp 96332 417934 0 0 3 0x14200 bored systq 52694 87012 0 0 3 0x40014200 bored softclock 83243 330642 0 0 3 0x40014200 idle0 25495 116514 0 0 3 0x14200 bored smr 1 210020 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 9504 6988K 7884K 78643K 14299 0 0 pcb 13 8K 8K 78643K 182 0 0 rtable 109 7K 8K 78643K 601 0 0 ifaddr 92 19K 21K 78643K 228 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 1 2K 2K 78643K 63 0 0 iov 0 0K 32K 78643K 149 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1221 77K 77K 78643K 2322 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 14 0 0 VM map 11 2K 2K 78643K 17 0 0 sem 12 0K 0K 78643K 196 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1794 195K 288K 78643K 12646 0 0 file desc 6 17K 25K 78643K 739 0 0 sigio 0 0K 0K 78643K 41 0 0 proc 48 38K 54K 78643K 630 0 0 subproc 32 2K 2K 78643K 119 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 327 0 0 in_multi 113 5K 5K 78643K 213 0 0 ether_multi 1 0K 0K 78643K 9 0 0 mrt 0 0K 0K 78643K 12 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 332 0 0 pfkey data 0 0K 0K 78643K 6 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 133 88K 88K 78643K 2767 0 0 UVM aobj 54 4K 4K 78643K 61 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 170 0 0 NDP 12 0K 0K 78643K 50 0 0 temp 133 3534K 4174K 78643K 33430 0 0 kqueue 0 0K 0K 78643K 14 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 13 1 0 1 1 0 8 0 rtpcb 80 103 0 101 1 0 1 1 0 8 0 rtentry 112 116 0 73 2 0 2 2 0 8 0 unpcb 120 407 0 399 1 0 1 1 0 8 0 syncache 264 7 0 7 3 3 0 1 0 8 0 tcpqe 32 114 0 114 1 1 0 1 0 8 0 tcpcb 544 305 0 301 3 1 2 2 0 8 1 ipq 40 13 0 13 4 3 1 1 0 8 1 ipqe 40 327 0 327 4 3 1 1 0 8 1 inpcb 280 1381 0 1374 7 5 2 4 0 8 1 rttmr 72 4 0 4 3 3 0 1 0 8 0 nd6 48 18 0 15 1 0 1 1 0 8 0 pkpcb 40 12 0 12 2 2 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 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 256 553 0 347 16 1 15 15 0 8 0 art_table 32 554 0 347 2 0 2 2 0 8 0 art_node 16 115 0 75 1 0 1 1 0 8 0 sysvmsgpl 40 49 0 15 1 0 1 1 0 8 0 semapl 112 194 0 184 1 0 1 1 0 8 0 shmpl 112 59 0 7 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2512 0 1117 46 0 46 46 0 8 0 ffsino 240 2512 0 1117 83 0 83 83 0 8 0 nchpl 144 3828 0 2222 60 0 60 60 0 8 0 uvmvnodes 72 3465 0 0 63 0 63 63 0 8 0 vnodes 208 3465 0 0 183 0 183 183 0 8 0 namei 1024 12661 0 12661 1 0 1 1 0 8 1 vcpupl 1984 8 0 0 1 0 1 1 0 8 0 vmpool 520 15 0 6 2 1 1 1 0 8 0 scsiplug 64 2 0 2 1 1 0 1 0 8 0 scxspl 192 11877 0 11877 11 10 1 7 0 8 1 plimitpl 152 93 0 86 1 0 1 1 0 8 0 sigapl 432 894 0 880 2 0 2 2 0 8 0 futexpl 56 23539 0 23539 1 0 1 1 0 8 1 knotepl 112 222 0 203 1 0 1 1 0 8 0 kqueuepl 104 205 0 203 1 0 1 1 0 8 0 pipepl 128 594 0 575 7 5 2 2 0 8 1 fdescpl 424 895 0 880 2 0 2 2 0 8 0 filepl 120 7978 0 7879 7 2 5 6 0 8 2 lockfpl 104 199 0 197 1 0 1 1 0 8 0 lockfspl 48 73 0 71 1 0 1 1 0 8 0 sessionpl 112 22 0 12 1 0 1 1 0 8 0 pgrppl 48 30 0 20 1 0 1 1 0 8 0 ucredpl 96 946 0 939 1 0 1 1 0 8 0 zombiepl 144 880 0 880 2 1 1 1 0 8 1 processpl 864 911 0 880 4 0 4 4 0 8 0 procpl 632 1832 0 1792 4 0 4 4 0 8 0 sosppl 128 14 0 14 3 2 1 1 0 8 1 sockpl 384 1938 0 1921 9 5 4 6 0 8 2 mcl64k 65536 80 0 80 2 1 1 1 0 8 1 mcl16k 16384 6 0 6 5 5 0 1 0 8 0 mcl12k 12288 23 0 23 3 2 1 1 0 8 1 mcl9k 9216 15 0 15 5 4 1 1 0 8 1 mcl8k 8192 52 0 52 2 1 1 1 0 8 1 mcl4k 4096 110 0 110 2 1 1 1 0 8 1 mcl2k2 2112 12 0 12 3 3 0 1 0 8 0 mcl2k 2048 70999 0 70954 18 11 7 15 0 8 0 mtagpl 80 32 0 19 2 1 1 1 0 8 0 mbufpl 256 119933 0 119786 69 53 16 38 0 8 3 bufpl 256 9233 0 3943 332 1 331 332 0 8 0 anonpl 16 124599 0 103963 120 24 96 101 0 62 11 amapchunkpl 152 4561 0 4406 13 6 7 11 0 158 0 amappl16 192 5358 0 4187 93 31 62 71 0 8 3 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 76 0 71 1 0 1 1 0 8 0 amappl13 168 351 0 349 2 1 1 1 0 8 0 amappl12 160 131 0 129 3 2 1 1 0 8 0 amappl11 152 64 0 53 1 0 1 1 0 8 0 amappl10 144 44 0 41 1 0 1 1 0 8 0 amappl9 136 635 0 632 1 0 1 1 0 8 0 amappl8 128 211 0 175 3 1 2 2 0 8 0 amappl7 120 80 0 73 1 0 1 1 0 8 0 amappl6 112 73 0 64 1 0 1 1 0 8 0 amappl5 104 293 0 282 1 0 1 1 0 8 0 amappl4 96 1155 0 1125 1 0 1 1 0 8 0 amappl3 88 144 0 138 1 0 1 1 0 8 0 amappl2 80 6407 0 6329 4 2 2 3 0 8 0 amappl1 72 26522 0 26107 27 18 9 20 0 8 0 amappl 80 2136 0 2084 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 60 0 7 1 0 1 1 0 8 0 uaddrrnd 24 910 0 880 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 910 0 880 1 0 1 1 0 8 0 vmmpekpl 168 9864 0 9832 2 0 2 2 0 8 0 vmmpepl 168 119076 0 116716 166 46 120 139 0 357 16 vmsppl 272 894 0 880 2 1 1 2 0 8 0 pdppl 4096 1826 0 1780 7 1 6 6 0 8 0 pvpl 32 342965 0 319187 270 43 227 232 0 265 31 pmappl 200 909 0 886 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 548 0 79 14 0 14 14 0 8 0