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 *221624 2611 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(ffff800000b0d700,7000,2000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b0d700,0,7,fffffd803f012000,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b0d700,0,7,fffffd803f012000,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff80001488d460,ffff800014914018) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000b67800,ffff800014914018) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000b67800,ffff800014914018) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd80361db340,c5005601,ffff800000b67800,1,fffffd803f7c6540,ffff800014914018) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd803eb12bc0,c5005601,ffff800000b67800,ffff800014914018) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800014914018,ffff800014935628,ffff800014935670) at sys_ioctl+0x5b9 syscall(ffff8000149356f0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8e198aa7e10, 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(ffff800000b0d700,7000,2000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b0d700,0,7,fffffd803f012000,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b0d700,0,7,fffffd803f012000,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff80001488d460,ffff800014914018) at vm_impl_init_vmx+0xf1 sys/arch/amd64/amd64/vmm.c:1270 vm_create(ffff800000b67800,ffff800014914018) at vm_create+0x193 vm_impl_init sys/arch/amd64/amd64/vmm.c:1385 [inline] vm_create(ffff800000b67800,ffff800014914018) at vm_create+0x193 sys/arch/amd64/amd64/vmm.c:1174 VOP_IOCTL(fffffd80361db340,c5005601,ffff800000b67800,1,fffffd803f7c6540,ffff800014914018) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd803eb12bc0,c5005601,ffff800000b67800,ffff800014914018) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800014914018,ffff800014935628,ffff800014935670) at sys_ioctl+0x5b9 syscall(ffff8000149356f0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8e198aa7e10, count: -11 ddb> show registers rdi 0xffffffff81b4c3b7 db_enter+0x17 rsi 0x21d6 __ALIGN_SIZE+0x11d6 rbp 0xffff800014935050 rbx 0xffff800014935100 rdx 0x21d7 __ALIGN_SIZE+0x11d7 rcx 0xffff800015543000 rax 0xffff800015543000 r8 0xffff800014935010 r9 0x1 r10 0xffff800000ab2ec0 r11 0x5b288a7e7029c756 r12 0x3000000008 r13 0xffff800014935060 r14 0x100 r15 0x1 rip 0xffffffff81b4c3b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014935040 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=221624 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000149153d8,0xffffffff825ac460 process=0xffff8000148a2018 user=0xffff800014930000, vmspace=0xfffffd803f012000 estcpu=36, cpticks=26, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 2611 204729 86759 0 3 0x80 fsleep syz-executor.0 * 2611 221624 86759 0 7 0x4000000 syz-executor.0 93722 68636 30216 0 3 0x80 fsleep syz-executor.1 93722 174091 30216 0 3 0x4000080 netcon syz-executor.1 86759 332283 44918 0 3 0x82 nanosleep syz-executor.0 47063 320776 1 0 3 0x100083 ttyin getty 78502 122240 0 0 3 0x14200 acct acct 25115 285514 0 0 3 0x14200 bored sosplice 30216 270009 44918 0 3 0x82 nanosleep syz-executor.1 44918 339822 7724 0 3 0x82 thrsleep syz-fuzzer 44918 46359 7724 0 3 0x4000082 nanosleep syz-fuzzer 44918 388076 7724 0 3 0x4000082 thrsleep syz-fuzzer 44918 138851 7724 0 3 0x4000082 thrsleep syz-fuzzer 44918 93954 7724 0 3 0x4000082 thrsleep syz-fuzzer 44918 215165 7724 0 3 0x4000082 kqread syz-fuzzer 44918 292881 7724 0 3 0x4000082 thrsleep syz-fuzzer 44918 53089 7724 0 3 0x4000082 thrsleep syz-fuzzer 7724 146599 85050 0 3 0x10008a pause ksh 85050 256412 61167 0 3 0x92 select sshd 61167 308518 1 0 3 0x80 select sshd 60322 91722 50963 73 3 0x100090 kqread syslogd 50963 317695 1 0 3 0x100082 netio syslogd 48890 415161 1 77 3 0x100090 poll dhclient 81360 477584 1 0 3 0x80 poll dhclient 37977 17833 0 0 2 0x14200 zerothread 46120 127291 0 0 3 0x14200 aiodoned aiodoned 29436 199980 0 0 3 0x14200 syncer update 10220 337912 0 0 3 0x14200 cleaner cleaner 12615 243394 0 0 3 0x14200 reaper reaper 75742 52878 0 0 3 0x14200 pgdaemon pagedaemon 72313 148194 0 0 3 0x14200 bored crynlk 99019 54823 0 0 3 0x14200 bored crypto 21554 404272 0 0 3 0x40014200 acpi0 acpi0 30170 417367 0 0 3 0x14200 bored softnet 85243 66936 0 0 3 0x14200 bored systqmp 2822 77008 0 0 3 0x14200 bored systq 5894 364223 0 0 3 0x40014200 bored softclock 18385 253422 0 0 3 0x40014200 idle0 3731 476112 0 0 3 0x14200 bored smr 1 40813 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 9531 6371K 7440K 78643K 13089 0 0 pcb 13 10K 12K 78643K 148 0 0 rtable 96 4K 5K 78643K 524 0 0 ifaddr 87 16K 17K 78643K 255 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 1 2K 2K 78643K 45 0 0 iov 0 0K 16K 78643K 226 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1221 77K 77K 78643K 2075 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 9 0 0 VM map 4 1K 1K 78643K 14 0 0 sem 12 0K 1K 78643K 333 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1794 195K 288K 78643K 12646 0 0 file desc 6 17K 25K 78643K 573 0 0 sigio 0 0K 0K 78643K 16 0 0 proc 48 38K 55K 78643K 503 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 50 0 0 in_multi 53 3K 3K 78643K 110 0 0 ether_multi 1 0K 0K 78643K 15 0 0 mrt 0 0K 0K 78643K 9 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 284 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 113 38K 38K 78643K 2260 0 0 UVM aobj 48 2K 2K 78643K 51 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 131 0 0 NDP 16 0K 0K 78643K 54 0 0 temp 151 3539K 4179K 78643K 10274 0 0 kqueue 0 0K 0K 78643K 12 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 12 0 8 1 0 1 1 0 8 0 rtpcb 80 91 0 89 1 0 1 1 0 8 0 rtentry 112 68 0 33 2 0 2 2 0 8 0 unpcb 120 365 0 357 1 0 1 1 0 8 0 syncache 264 7 0 7 2 2 0 1 0 8 0 tcpqe 32 90 0 90 1 1 0 1 0 8 0 tcpcb 544 467 0 461 14 13 1 14 0 8 0 ipq 40 3 0 3 2 2 0 1 0 8 0 ipqe 40 49 0 49 2 2 0 1 0 8 0 inpcb 280 1272 0 1262 10 8 2 9 0 8 1 rttmr 72 2 0 2 1 1 0 1 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 7 0 5 1 0 1 1 0 8 0 ppxss 1128 17 0 17 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 341 0 158 16 2 14 15 0 8 0 art_table 32 344 0 158 2 0 2 2 0 8 0 art_node 16 67 0 35 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 12 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 326 0 316 1 0 1 1 0 8 0 shmpl 112 49 0 3 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2305 0 909 46 0 46 46 0 8 0 ffsino 240 2305 0 909 83 0 83 83 0 8 0 nchpl 144 3503 0 1905 60 0 60 60 0 8 0 uvmvnodes 72 3064 0 0 56 0 56 56 0 8 0 vnodes 208 3064 0 0 162 0 162 162 0 8 0 namei 1024 10649 0 10649 1 0 1 1 0 8 1 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 520 12 0 10 3 2 1 1 0 8 0 scxspl 192 10313 0 10313 9 8 1 7 0 8 1 plimitpl 152 69 0 62 1 0 1 1 0 8 0 sigapl 432 742 0 728 2 0 2 2 0 8 0 futexpl 56 19579 0 19577 1 0 1 1 0 8 0 knotepl 112 165 0 146 1 0 1 1 0 8 0 kqueuepl 104 309 0 306 4 3 1 4 0 8 0 pipepl 128 520 0 501 3 2 1 2 0 8 0 fdescpl 424 743 0 728 2 0 2 2 0 8 0 filepl 120 6926 0 6824 14 9 5 11 0 8 1 lockfpl 104 413 0 412 1 0 1 1 0 8 0 lockfspl 48 84 0 83 1 0 1 1 0 8 0 sessionpl 112 20 0 10 1 0 1 1 0 8 0 pgrppl 48 30 0 20 1 0 1 1 0 8 0 ucredpl 96 618 0 611 1 0 1 1 0 8 0 zombiepl 144 728 0 728 1 0 1 1 0 8 1 processpl 864 759 0 728 4 0 4 4 0 8 0 procpl 632 1487 0 1447 4 0 4 4 0 8 0 sosppl 128 26 0 26 2 2 0 1 0 8 0 sockpl 384 1741 0 1720 16 12 4 14 0 8 1 mcl64k 65536 333 0 333 33 3 30 33 0 8 30 mcl16k 16384 11 0 11 3 3 0 1 0 8 0 mcl12k 12288 22 0 22 2 1 1 1 0 8 1 mcl9k 9216 17 0 17 2 2 0 1 0 8 0 mcl8k 8192 28 0 28 2 1 1 1 0 8 1 mcl4k 4096 88 0 88 2 1 1 1 0 8 1 mcl2k2 2112 10 0 10 1 1 0 1 0 8 0 mcl2k 2048 71674 0 71626 22 15 7 16 0 8 0 mtagpl 80 23 0 11 2 1 1 1 0 8 0 mbufpl 256 119478 0 119367 40 22 18 26 0 8 8 bufpl 256 9703 0 3293 402 0 402 402 0 8 0 anonpl 16 116949 0 94324 125 19 106 116 0 62 15 amapchunkpl 152 3852 0 3667 19 11 8 16 0 158 0 amappl16 192 5075 0 3767 89 20 69 77 0 8 3 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 159 0 151 1 0 1 1 0 8 0 amappl13 168 8 0 8 1 1 0 1 0 8 0 amappl12 160 272 0 269 1 0 1 1 0 8 0 amappl11 152 56 0 45 1 0 1 1 0 8 0 amappl10 144 11 0 9 1 0 1 1 0 8 0 amappl9 136 728 0 724 1 0 1 1 0 8 0 amappl8 128 322 0 294 2 1 1 2 0 8 0 amappl7 120 40 0 35 1 0 1 1 0 8 0 amappl6 112 59 0 48 1 0 1 1 0 8 0 amappl5 104 441 0 427 1 0 1 1 0 8 0 amappl4 96 723 0 693 1 0 1 1 0 8 0 amappl3 88 407 0 400 1 0 1 1 0 8 0 amappl2 80 5119 0 5042 3 1 2 3 0 8 0 amappl1 72 23025 0 22594 27 18 9 20 0 8 0 amappl 80 1741 0 1692 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 50 0 3 1 0 1 1 0 8 0 uaddrrnd 24 755 0 728 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 755 0 728 1 0 1 1 0 8 0 vmmpekpl 168 9318 0 9291 2 0 2 2 0 8 0 vmmpepl 168 97269 0 94775 165 32 133 141 0 357 24 vmsppl 272 742 0 728 2 1 1 2 0 8 0 pdppl 4096 1516 0 1477 6 1 5 6 0 8 0 pvpl 32 317493 0 291132 275 17 258 268 0 265 45 pmappl 200 754 0 738 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 634 0 64 17 0 17 17 0 8 0