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 *363546 61325 0 0 0x4000000 0 syz-executor.0 207138 1846 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(ffff800000ba7800,2000,c000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000ba7800,0,7,fffffd807f0072e0,20002000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000ba7800,0,7,fffffd807f0072e0,20002000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800020b2c450,ffff800020ab0290) 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(fffffd806e1e38f0,c5005601,ffff800000a95800,1,fffffd807f7c6840,ffff800020ab0290) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806ca48140,c5005601,ffff800000a95800,ffff800020ab0290) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020ab0290,ffff800022d63e28,ffff800022d63e70) at sys_ioctl+0x5b9 syscall(ffff800022d63ef0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d63ef0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcfc3e021ff0, 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(ffff800000ba7800,2000,c000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000ba7800,0,7,fffffd807f0072e0,20002000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000ba7800,0,7,fffffd807f0072e0,20002000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800020b2c450,ffff800020ab0290) 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(fffffd806e1e38f0,c5005601,ffff800000a95800,1,fffffd807f7c6840,ffff800020ab0290) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806ca48140,c5005601,ffff800000a95800,ffff800020ab0290) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020ab0290,ffff800022d63e28,ffff800022d63e70) at sys_ioctl+0x5b9 syscall(ffff800022d63ef0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d63ef0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcfc3e021ff0, count: -11 ddb{0}> show registers rdi 0xffffffff81e8ddc7 db_enter+0x17 rsi 0x20e1 __ALIGN_SIZE+0x10e1 rbp 0xffff800022d63850 rbx 0xffff800022d63900 rdx 0x20e2 __ALIGN_SIZE+0x10e2 rcx 0xffff800023966000 rax 0xffff800023966000 r8 0xffffffff81298dcf kprintf+0x16f r9 0x1 r10 0x25 r11 0x36f8a762a5769b16 r12 0x3000000008 r13 0xffff800022d63860 r14 0x100 r15 0x1 rip 0xffffffff81e8ddc8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d63840 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=363546 stat=onproc flags process=0 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0c70,0xffffffff82648da8 process=0xffff800020adce00 user=0xffff800022d5e000, vmspace=0xfffffd807f0072e0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61325 269869 41140 0 2 0 syz-executor.0 *61325 363546 41140 0 7 0x4000000 syz-executor.0 41140 283368 1846 0 3 0x82 nanosleep syz-executor.0 26651 362884 1846 0 2 0x482 syz-executor.1 36147 162388 1 0 3 0x100083 ttyin getty 10737 290355 0 0 3 0x14200 acct acct 30384 356145 0 0 3 0x14200 bored sosplice 1846 417358 80482 0 3 0x82 thrsleep syz-fuzzer 1846 230892 80482 0 2 0x4000002 syz-fuzzer 1846 137211 80482 0 3 0x4000082 thrsleep syz-fuzzer 1846 207138 80482 0 7 0x4000482 syz-fuzzer 1846 170143 80482 0 3 0x4000082 thrsleep syz-fuzzer 1846 73069 80482 0 3 0x4000082 thrsleep syz-fuzzer 1846 220871 80482 0 3 0x4000082 thrsleep syz-fuzzer 1846 273906 80482 0 3 0x4000082 thrsleep syz-fuzzer 1846 295755 80482 0 3 0x4000082 kqread syz-fuzzer 1846 69090 80482 0 3 0x4000082 thrsleep syz-fuzzer 80482 83416 94851 0 3 0x10008a pause ksh 94851 470551 38025 0 3 0x92 select sshd 38025 9379 1 0 3 0x80 select sshd 89310 491213 87343 74 3 0x100092 bpf pflogd 87343 365105 1 0 3 0x80 netio pflogd 30610 257630 41781 73 3 0x100090 kqread syslogd 41781 424535 1 0 3 0x100082 netio syslogd 63880 244126 1 77 3 0x100090 poll dhclient 44364 235355 1 0 3 0x80 poll dhclient 3218 158553 0 0 3 0x14200 pgzero zerothread 4765 285190 0 0 3 0x14200 aiodoned aiodoned 68558 463766 0 0 3 0x14200 syncer update 64555 158812 0 0 3 0x14200 cleaner cleaner 11160 109108 0 0 3 0x14200 reaper reaper 42446 305895 0 0 3 0x14200 pgdaemon pagedaemon 88449 99112 0 0 3 0x14200 bored crynlk 76172 491174 0 0 3 0x14200 bored crypto 74311 291833 0 0 3 0x40014200 acpi0 acpi0 60037 170654 0 0 3 0x40014200 idle1 37246 20563 0 0 3 0x14200 bored softnet 24201 252332 0 0 3 0x14200 bored systqmp 80229 274472 0 0 3 0x14200 bored systq 3463 289208 0 0 3 0x40014200 bored softclock 54724 143760 0 0 3 0x40014200 idle0 57934 243261 0 0 3 0x14200 bored smr 1 380325 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 61325 (syz-executor.0) thread 0xffff800020ab0290 (363546) shared rwlock vmmaplk r = 0 (0xfffffd807f0072f8) #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 (0xffff800000ba7818) #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 (0xffffffff82635090) #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 9582 6719K 7482K 78643K 13488 0 0 pcb 13 8K 9K 78643K 249 0 0 rtable 109 5K 6K 78643K 806 0 0 ifaddr 138 20K 21K 78643K 324 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 1 2K 4K 78643K 1503 0 0 iov 0 0K 16K 78643K 175 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1223 77K 77K 78643K 2178 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 17 0 0 VM map 7 3K 3K 78643K 9 0 0 sem 12 0K 1K 78643K 210 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1809 196K 290K 78643K 12766 0 0 file desc 5 13K 25K 78643K 913 0 0 sigio 0 0K 0K 78643K 218 0 0 proc 61 63K 95K 78643K 758 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 1K 78643K 891 0 0 in_multi 72 3K 3K 78643K 193 0 0 ether_multi 1 0K 0K 78643K 5 0 0 mrt 0 0K 0K 78643K 6 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 78 344K 344K 78643K 78 0 0 exec 0 0K 1K 78643K 353 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 135 55K 60K 78643K 4538 0 0 UVM aobj 74 3K 3K 78643K 76 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 232 0 0 NDP 19 0K 0K 78643K 76 0 0 temp 163 3552K 3631K 78643K 46105 0 0 kqueue 0 0K 0K 78643K 4 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 26 0 21 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 93 0 91 1 0 1 1 0 8 0 rtentry 112 145 0 105 2 0 2 2 0 8 0 unpcb 120 965 0 955 1 0 1 1 0 8 0 syncache 264 6 0 6 3 2 1 1 0 8 1 tcpqe 32 100 0 100 2 1 1 1 0 8 1 tcpcb 544 1633 0 1628 8 6 2 3 0 8 1 inpcb 280 2752 0 2744 11 9 2 4 0 8 1 rttmr 72 3 0 3 2 2 0 1 0 8 0 nd6 48 21 0 18 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 ppxss 1128 23 0 23 8 8 0 1 0 8 0 pffrag 232 15 0 15 5 4 1 1 0 482 1 pffrnode 88 15 0 15 5 4 1 1 0 8 1 pffrent 40 416 0 416 5 4 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 87 0 55 1 0 1 1 0 8 0 pfstkey 112 87 0 55 2 0 2 2 0 8 0 pfstate 328 87 0 55 4 0 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 725 0 517 19 6 13 15 0 8 0 art_table 32 728 0 517 2 0 2 2 0 8 0 art_node 16 144 0 107 1 0 1 1 0 8 0 sysvmsgpl 40 37 0 25 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 208 0 198 1 0 1 1 0 8 0 shmpl 112 74 0 2 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2871 0 1466 46 0 46 46 0 8 0 ffsino 272 2871 0 1466 97 2 95 95 0 8 0 nchpl 144 4519 0 2906 61 1 60 61 0 8 0 uvmvnodes 72 3671 0 0 67 0 67 67 0 8 0 vnodes 208 3671 0 0 194 0 194 194 0 8 0 namei 1024 14820 0 14820 4 3 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 4 0 0 1 0 1 1 0 8 0 vmpool 552 7 0 2 1 0 1 1 0 8 0 scsiplug 64 2 0 2 1 1 0 1 0 8 0 scxspl 192 14231 0 14231 14 13 1 7 0 8 1 plimitpl 152 94 0 86 1 0 1 1 0 8 0 sigapl 432 1098 0 1083 3 1 2 3 0 8 0 futexpl 56 24838 0 24838 2 1 1 1 0 8 1 knotepl 112 215 0 196 1 0 1 1 0 8 0 kqueuepl 104 293 0 291 1 0 1 1 0 8 0 pipepl 160 1080 0 1061 5 3 2 2 0 8 1 fdescpl 488 1099 0 1083 3 0 3 3 0 8 0 filepl 152 11466 0 11365 19 13 6 7 0 8 1 lockfpl 104 477 0 476 1 0 1 1 0 8 0 lockfspl 48 190 0 189 1 0 1 1 0 8 0 sessionpl 112 25 0 14 1 0 1 1 0 8 0 pgrppl 48 35 0 24 1 0 1 1 0 8 0 ucredpl 96 986 0 977 1 0 1 1 0 8 0 zombiepl 144 1083 0 1082 3 2 1 1 0 8 0 processpl 896 1116 0 1082 4 0 4 4 0 8 0 procpl 632 3444 0 3400 8 3 5 5 0 8 1 srpgc 64 10 0 10 4 4 0 1 0 8 0 sosppl 128 247 0 247 3 2 1 1 0 8 1 sockpl 384 3821 0 3801 25 19 6 8 0 8 3 mcl64k 65536 567 0 0 66 0 66 66 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 14 0 0 2 0 2 2 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 13 0 0 2 0 2 2 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 216 0 0 26 0 26 26 0 8 0 mtagpl 80 99 0 0 2 0 2 2 0 8 0 mbufpl 256 1094 0 0 63 0 63 63 0 8 0 bufpl 256 8836 0 1778 442 0 442 442 0 8 0 anonpl 16 165341 0 146823 143 40 103 104 0 124 14 amapchunkpl 152 10946 0 10791 29 19 10 14 0 158 2 amappl16 192 7242 0 6035 119 50 69 73 0 8 7 amappl15 184 21 0 19 1 0 1 1 0 8 0 amappl14 176 160 0 153 1 0 1 1 0 8 0 amappl13 168 400 0 399 1 0 1 1 0 8 0 amappl12 160 7 0 7 1 1 0 1 0 8 0 amappl11 152 124 0 109 1 0 1 1 0 8 0 amappl10 144 93 0 83 1 0 1 1 0 8 0 amappl9 136 668 0 665 1 0 1 1 0 8 0 amappl8 128 250 0 212 2 0 2 2 0 8 0 amappl7 120 141 0 131 1 0 1 1 0 8 0 amappl6 112 115 0 105 1 0 1 1 0 8 0 amappl5 104 188 0 173 1 0 1 1 0 8 0 amappl4 96 1383 0 1349 1 0 1 1 0 8 0 amappl3 88 155 0 149 1 0 1 1 0 8 0 amappl2 80 7971 0 7896 3 1 2 3 0 8 0 amappl1 72 34971 0 34538 26 15 11 20 0 8 0 amappl 80 3839 0 3788 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 75 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1106 0 1083 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1106 0 1083 1 0 1 1 0 8 0 vmmpekpl 168 14263 0 14226 2 0 2 2 0 8 0 vmmpepl 168 151010 0 148633 250 97 153 162 0 357 43 vmsppl 368 1098 0 1083 2 0 2 2 0 8 0 pdppl 4096 2219 0 2174 6 0 6 6 0 8 0 pvpl 32 442946 0 421168 304 66 238 240 0 265 32 pmappl 232 1105 0 1085 3 1 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 749 0 20 21 0 21 21 0 8 0