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 *307325 44157 0 0 0x4000000 0 syz-executor.0 90614 58917 0 0x2 0x4000480 1 syz-fuzzer 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(ffff800000b5ca00,24000,1000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b5ca00,0,7,fffffd807f0075c0,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b5ca00,0,7,fffffd807f0075c0,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800020b5ccf0,ffff800020ab09f8) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create() at vm_create+0x1a0 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create() at vm_create+0x1a0 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd806e5715b0,c5005601,ffff800000abc000,1,fffffd807f7c6960,ffff800020ab09f8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806ca27438,c5005601,ffff800000abc000,ffff800020ab09f8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020ab09f8,ffff800023bc1c58,ffff800023bc1ca0) at sys_ioctl+0x5b9 syscall(ffff800023bc1d20) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023bc1d20) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3b67b93f9e0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic uvmspace_fork: no space in map for entry in empty map ddb{0}> 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(ffff800000b5ca00,24000,1000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b5ca00,0,7,fffffd807f0075c0,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b5ca00,0,7,fffffd807f0075c0,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800020b5ccf0,ffff800020ab09f8) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create() at vm_create+0x1a0 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create() at vm_create+0x1a0 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd806e5715b0,c5005601,ffff800000abc000,1,fffffd807f7c6960,ffff800020ab09f8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806ca27438,c5005601,ffff800000abc000,ffff800020ab09f8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020ab09f8,ffff800023bc1c58,ffff800023bc1ca0) at sys_ioctl+0x5b9 syscall(ffff800023bc1d20) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023bc1d20) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3b67b93f9e0, count: -11 ddb{0}> show registers rdi 0xffffffff81bd1c77 db_enter+0x17 rsi 0x1fc5 __ALIGN_SIZE+0xfc5 rbp 0xffff800023bc1680 rbx 0xffff800023bc1730 rdx 0x1fc6 __ALIGN_SIZE+0xfc6 rcx 0xffff800023d64000 rax 0xffff800023d64000 r8 0xffffffff81d1421f kprintf+0x16f r9 0x1 r10 0x25 r11 0xa666df52b9a749a6 r12 0x3000000008 r13 0xffff800023bc1690 r14 0x100 r15 0x1 rip 0xffffffff81bd1c78 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023bc1670 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=307325 stat=onproc flags process=0 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0508,0xffff800020ab18d8 process=0xffff800020adca80 user=0xffff800023bbc000, vmspace=0xfffffd807f0075c0 estcpu=29, cpticks=17, pctcpu=1.66 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 34400 513842 43076 0 2 0 syz-executor.1 44157 364080 88369 0 2 0 syz-executor.0 *44157 307325 88369 0 7 0x4000000 syz-executor.0 43076 46755 58917 0 3 0x82 nanosleep syz-executor.1 88369 62139 58917 0 2 0x482 syz-executor.0 14839 356297 0 0 3 0x14200 bored sosplice 58917 212067 33334 0 3 0x82 thrsleep syz-fuzzer 58917 90614 33334 0 7 0x4000482 syz-fuzzer 58917 149708 33334 0 3 0x4000082 thrsleep syz-fuzzer 58917 496487 33334 0 3 0x4000082 thrsleep syz-fuzzer 58917 504890 33334 0 3 0x4000082 thrsleep syz-fuzzer 58917 17371 33334 0 3 0x4000082 thrsleep syz-fuzzer 58917 125406 33334 0 3 0x4000082 thrsleep syz-fuzzer 58917 329483 33334 0 3 0x4000082 thrsleep syz-fuzzer 58917 521103 33334 0 3 0x4000082 kqread syz-fuzzer 58917 207639 33334 0 2 0x4000002 syz-fuzzer 33334 178904 79709 0 3 0x10008a pause ksh 79709 158472 78527 0 3 0x92 select sshd 66876 214549 1 0 3 0x100083 ttyin getty 78527 148065 1 0 3 0x80 select sshd 70369 115057 2823 74 3 0x100092 bpf pflogd 2823 517062 1 0 3 0x80 netio pflogd 31095 54601 56703 73 3 0x100090 kqread syslogd 56703 330717 1 0 3 0x100082 netio syslogd 51363 283967 1 77 3 0x100090 poll dhclient 13813 13785 1 0 3 0x80 poll dhclient 60846 173300 0 0 3 0x14200 pgzero zerothread 32278 495583 0 0 3 0x14200 aiodoned aiodoned 83216 152156 0 0 3 0x14200 syncer update 98177 434076 0 0 3 0x14200 cleaner cleaner 91295 162822 0 0 3 0x14200 reaper reaper 86186 478192 0 0 3 0x14200 pgdaemon pagedaemon 76347 144147 0 0 3 0x14200 bored crynlk 65095 510275 0 0 3 0x14200 bored crypto 75504 285421 0 0 3 0x40014200 acpi0 acpi0 58134 321865 0 0 3 0x40014200 idle1 39222 393357 0 0 3 0x14200 bored softnet 85239 14760 0 0 3 0x14200 bored systqmp 23419 36435 0 0 3 0x14200 bored systq 68860 35977 0 0 3 0x40014200 bored softclock 37036 210035 0 0 3 0x40014200 idle0 8838 319168 0 0 3 0x14200 bored smr 1 53672 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 44157 (syz-executor.0) thread 0xffff800020ab09f8 (307325) shared rwlock vmmaplk r = 0 (0xfffffd807f0075d8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 uvm_share+0xcf vm_map_lock_read_ln sys/uvm/uvm_map.c:5365 [inline] #1 uvm_share+0xcf sys/uvm/uvm_map.c:3627 #2 vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 #3 vm_create+0x1a0 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] #3 vm_create+0x1a0 sys/arch/amd64/amd64/vmm.c:1174 #4 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 #5 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 #6 sys_ioctl+0x5b9 #7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #8 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xffff800000b5ca18) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5343 #3 uvm_share+0xa7 vm_map_lock_read_ln sys/uvm/uvm_map.c:5364 [inline] #3 uvm_share+0xa7 sys/uvm/uvm_map.c:3627 #4 vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 #5 vm_create+0x1a0 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] #5 vm_create+0x1a0 sys/arch/amd64/amd64/vmm.c:1174 #6 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 #7 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 #8 sys_ioctl+0x5b9 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 exclusive rwlock vmlistlock r = 0 (0xffff800000671478) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 vm_create+0x130 vm_impl_init sys/arch/amd64/amd64/vmm.c:1383 [inline] #1 vm_create+0x130 sys/arch/amd64/amd64/vmm.c:1174 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 #3 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 #4 sys_ioctl+0x5b9 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8265d4b0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9535 6429K 7176K 78643K 11457 0 0 pcb 13 8K 8K 78643K 98 0 0 rtable 108 4K 4K 78643K 495 0 0 ifaddr 83 16K 16K 78643K 196 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 1 2K 4K 78643K 1503 0 0 iov 0 0K 28K 78643K 93 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1216 76K 77K 78643K 1596 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 5 0 0 VM map 13 6K 6K 78643K 13 0 0 sem 12 1K 1K 78643K 12 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1809 196K 290K 78643K 12766 0 0 file desc 6 17K 25K 78643K 442 0 0 sigio 1 0K 0K 78643K 11 0 0 proc 61 63K 95K 78643K 638 0 0 subproc 32 2K 2K 78643K 102 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 35 0 0 in_multi 52 2K 2K 78643K 122 0 0 ether_multi 1 0K 0K 78643K 10 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 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 297 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 131 71K 73K 78643K 2525 0 0 UVM aobj 47 4K 4K 78643K 47 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 98 0 0 NDP 14 0K 0K 78643K 46 0 0 temp 144 3559K 3623K 78643K 21142 0 0 kqueue 0 0K 0K 78643K 8 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 15 0 9 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 59 0 57 1 0 1 1 0 8 0 rtentry 112 88 0 44 2 0 2 2 0 8 0 unpcb 120 218 0 208 1 0 1 1 0 8 0 syncache 264 7 0 7 2 2 0 1 0 8 0 tcpqe 32 16 0 16 1 1 0 1 0 8 0 tcpcb 544 160 0 156 1 0 1 1 0 8 0 inpcb 280 643 0 636 3 1 2 2 0 8 1 nd6 48 12 0 8 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 ppxss 1128 14 0 14 2 1 1 1 0 8 1 pffrag 232 14 0 14 1 0 1 1 0 482 1 pffrnode 88 14 0 14 1 0 1 1 0 8 1 pffrent 40 376 0 376 1 0 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 63 0 8 1 0 1 1 0 8 0 pfstkey 112 63 0 8 2 0 2 2 0 8 0 pfstate 328 63 0 8 5 0 5 5 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 402 0 178 17 3 14 14 0 8 0 art_table 32 403 0 178 2 0 2 2 0 8 0 art_node 16 87 0 47 1 0 1 1 0 8 0 sysvmsgpl 40 52 0 28 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 45 0 0 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2110 0 700 46 0 46 46 0 8 0 ffsino 272 2110 0 700 96 1 95 95 0 8 0 nchpl 144 3020 0 1414 61 1 60 61 0 8 0 uvmvnodes 72 2424 0 0 45 0 45 45 0 8 0 vnodes 208 2424 0 0 128 0 128 128 0 8 0 namei 1024 9246 0 9246 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 10 0 0 2 0 2 2 0 8 0 vmpool 552 11 0 0 1 0 1 1 0 8 0 scxspl 192 9002 0 9002 11 8 3 7 0 8 3 plimitpl 152 50 0 42 1 0 1 1 0 8 0 sigapl 432 628 0 612 3 1 2 3 0 8 0 futexpl 56 9720 0 9720 1 0 1 1 0 8 1 knotepl 112 142 0 123 1 0 1 1 0 8 0 kqueuepl 104 86 0 83 1 0 1 1 0 8 0 pipepl 160 384 0 365 3 1 2 2 0 8 1 fdescpl 488 629 0 612 3 0 3 3 0 8 0 filepl 152 4860 0 4757 7 1 6 6 0 8 2 lockfpl 104 186 0 185 1 0 1 1 0 8 0 lockfspl 48 66 0 65 1 0 1 1 0 8 0 sessionpl 112 22 0 11 1 0 1 1 0 8 0 pgrppl 48 32 0 21 1 0 1 1 0 8 0 ucredpl 96 515 0 506 1 0 1 1 0 8 0 zombiepl 144 612 0 612 1 0 1 1 0 8 1 processpl 896 645 0 612 4 0 4 4 0 8 0 procpl 632 1542 0 1499 5 0 5 5 0 8 1 srpgc 64 6 0 6 3 3 0 1 0 8 0 sosppl 128 5 0 5 2 2 0 1 0 8 0 sockpl 384 934 0 915 5 2 3 4 0 8 1 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 180 0 0 22 0 22 22 0 8 0 mtagpl 80 14 0 0 1 0 1 1 0 8 0 mbufpl 256 277 0 0 17 0 17 17 0 8 0 bufpl 256 7721 0 1311 401 0 401 401 0 8 0 anonpl 16 91097 0 68411 94 2 92 92 0 124 0 amapchunkpl 152 4298 0 4087 22 7 15 15 0 158 5 amappl16 192 3116 0 1687 73 1 72 72 0 8 0 amappl15 184 171 0 170 1 0 1 1 0 8 0 amappl14 176 112 0 106 1 0 1 1 0 8 0 amappl13 168 3 0 1 1 0 1 1 0 8 0 amappl12 160 122 0 116 1 0 1 1 0 8 0 amappl11 152 127 0 111 1 0 1 1 0 8 0 amappl10 144 96 0 92 1 0 1 1 0 8 0 amappl9 136 656 0 652 1 0 1 1 0 8 0 amappl8 128 211 0 182 1 0 1 1 0 8 0 amappl7 120 130 0 124 1 0 1 1 0 8 0 amappl6 112 104 0 95 1 0 1 1 0 8 0 amappl5 104 273 0 256 1 0 1 1 0 8 0 amappl4 96 839 0 807 1 0 1 1 0 8 0 amappl3 88 234 0 228 1 0 1 1 0 8 0 amappl2 80 3959 0 3885 3 1 2 3 0 8 0 amappl1 72 24176 0 23743 25 15 10 20 0 8 0 amappl 80 1880 0 1825 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 46 0 0 1 0 1 1 0 8 0 uaddrrnd 24 640 0 612 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 640 0 612 1 0 1 1 0 8 0 vmmpekpl 168 9357 0 9322 2 0 2 2 0 8 0 vmmpepl 168 88212 0 85529 161 9 152 152 0 357 35 vmsppl 368 628 0 612 2 0 2 2 0 8 0 pdppl 4096 1287 0 1234 7 0 7 7 0 8 0 pvpl 32 270417 0 244227 221 9 212 212 0 265 0 pmappl 232 639 0 612 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 578 0 7 17 0 17 17 0 8 0