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 *195284 59745 0 0 0x4000000 0K syz-executor.1 285839 42253 0 0x2 0x4000000 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(ffff800000ad9800,1f000,4000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000ad9800,0,7,fffffd807f0085c0,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000ad9800,0,7,fffffd807f0085c0,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800020ace8a0,ffff800020ab13d8) 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(fffffd806e2bc9c0,c5005601,ffff800000ad3000,1,fffffd807f7c68a0,ffff800020ab13d8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806fc0d4c0,c5005601,ffff800000ad3000,ffff800020ab13d8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020ab13d8,ffff800022d60f88,ffff800022d60fd0) at sys_ioctl+0x5b9 syscall(ffff800022d61050) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d61050) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x62e8db63d40, 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(ffff800000ad9800,1f000,4000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000ad9800,0,7,fffffd807f0085c0,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000ad9800,0,7,fffffd807f0085c0,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800020ace8a0,ffff800020ab13d8) 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(fffffd806e2bc9c0,c5005601,ffff800000ad3000,1,fffffd807f7c68a0,ffff800020ab13d8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806fc0d4c0,c5005601,ffff800000ad3000,ffff800020ab13d8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020ab13d8,ffff800022d60f88,ffff800022d60fd0) at sys_ioctl+0x5b9 syscall(ffff800022d61050) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d61050) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x62e8db63d40, count: -11 ddb{0}> show registers rdi 0xffffffff8179b677 db_enter+0x17 rsi 0x23c1 __ALIGN_SIZE+0x13c1 rbp 0xffff800022d609b0 rbx 0xffff800022d60a60 rdx 0x23c2 __ALIGN_SIZE+0x13c2 rcx 0xffff800022d8a000 rax 0xffff800022d8a000 r8 0xffffffff8171ab0f kprintf+0x16f r9 0x1 r10 0x25 r11 0x70cb63afce4e5953 r12 0x3000000008 r13 0xffff800022d609c0 r14 0x100 r15 0x1 rip 0xffffffff8179b678 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d609a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=195284 stat=onproc flags process=0 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0018,0xffffffff82673ed0 process=0xffff800020a8a010 user=0xffff800022d5c000, vmspace=0xfffffd807f0085c0 estcpu=29, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 59745 143769 15627 0 2 0 syz-executor.1 59745 282588 15627 0 2 0x4000000 syz-executor.1 *59745 195284 15627 0 7 0x4000000 syz-executor.1 25387 208940 42253 0 2 0x2 syz-executor.0 33119 245178 0 0 3 0x14200 acct acct 15627 203510 42253 0 3 0x82 nanosleep syz-executor.1 3838 4321 0 0 3 0x14200 bored sosplice 42253 503163 56183 0 3 0x82 thrsleep syz-fuzzer 42253 470917 56183 0 3 0x4000082 nanosleep syz-fuzzer 42253 315011 56183 0 3 0x4000082 thrsleep syz-fuzzer 42253 285839 56183 0 7 0x4000002 syz-fuzzer 42253 501830 56183 0 3 0x4000082 nanosleep syz-fuzzer 42253 208313 56183 0 3 0x4000082 thrsleep syz-fuzzer 42253 422348 56183 0 2 0x4000002 syz-fuzzer 42253 372515 56183 0 3 0x4000082 thrsleep syz-fuzzer 42253 498384 56183 0 3 0x4000082 thrsleep syz-fuzzer 42253 63301 56183 0 3 0x4000082 thrsleep syz-fuzzer 56183 89875 21218 0 3 0x10008a pause ksh 21218 423342 31638 0 3 0x92 select sshd 15733 76117 1 0 3 0x100083 ttyin getty 31638 357196 1 0 3 0x80 select sshd 35244 329924 67803 74 3 0x100092 bpf pflogd 67803 181695 1 0 3 0x80 netio pflogd 27703 326435 83023 73 3 0x100090 kqread syslogd 83023 134222 1 0 3 0x100082 netio syslogd 53980 57181 1 77 3 0x100090 poll dhclient 39322 235256 1 0 3 0x80 poll dhclient 70261 415610 0 0 2 0x14200 zerothread 33821 68900 0 0 3 0x14200 aiodoned aiodoned 84752 438362 0 0 3 0x14200 syncer update 91605 212265 0 0 3 0x14200 cleaner cleaner 34282 483202 0 0 3 0x14200 reaper reaper 43517 130191 0 0 3 0x14200 pgdaemon pagedaemon 96325 415634 0 0 3 0x14200 bored crynlk 27871 148479 0 0 3 0x14200 bored crypto 13218 252490 0 0 3 0x40014200 acpi0 acpi0 29132 362321 0 0 3 0x40014200 idle1 81127 257411 0 0 3 0x14200 bored softnet 93491 246557 0 0 3 0x14200 bored systqmp 53456 51334 0 0 3 0x14200 bored systq 42739 429289 0 0 3 0x40014200 bored softclock 7112 516168 0 0 3 0x40014200 idle0 2851 427473 0 0 3 0x14200 bored smr 1 391448 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 59745 (syz-executor.1) thread 0xffff800020ab13d8 (195284) shared rwlock vmmaplk r = 0 (0xfffffd807f0085d8) #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 (0xffff800000ad9818) #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 (0xffffffff826614b8) #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 Process 25387 (syz-executor.0) thread 0xffff800020ab0290 (208940) exclusive rrwlock inode r = 0 (0xfffffd806f07c2b8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:451 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x14b4 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #11 namei+0x63c sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1785 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806503db40) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:451 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1785 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9552 6430K 7446K 78643K 12823 0 0 pcb 13 10K 12K 78643K 245 0 0 rtable 108 13K 15K 78643K 715 0 0 ifaddr 112 18K 18K 78643K 227 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 1 2K 4K 78643K 1508 0 0 iov 0 0K 72K 78643K 202 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1229 77K 78K 78643K 1964 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 15 0 0 VM map 14 7K 7K 78643K 15 0 0 sem 12 0K 0K 78643K 243 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1809 196K 290K 78643K 12766 0 0 file desc 5 13K 25K 78643K 1163 0 0 sigio 0 0K 0K 78643K 38 0 0 proc 60 63K 83K 78643K 713 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 1K 78643K 194 0 0 in_multi 77 4K 4K 78643K 221 0 0 ether_multi 1 0K 0K 78643K 16 0 0 mrt 2 0K 0K 78643K 8 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 343 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 146 105K 105K 78643K 4825 0 0 UVM aobj 44 6K 6K 78643K 46 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 194 0 0 NDP 17 0K 0K 78643K 57 0 0 temp 156 3551K 3619K 78643K 51942 0 0 kqueue 0 0K 0K 78643K 6 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 23 0 19 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 107 0 105 1 0 1 1 0 8 0 rtentry 112 153 0 115 2 0 2 2 0 8 0 unpcb 120 858 0 847 2 1 1 2 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 tcpqe 32 129 0 129 2 2 0 1 0 8 0 tcpcb 544 579 0 573 12 11 1 12 0 8 0 inpcb 280 3135 0 3126 18 16 2 9 0 8 1 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 24 0 21 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 10 0 10 3 2 1 1 0 8 1 pffrag 232 16 0 16 5 4 1 1 0 482 1 pffrnode 88 16 0 16 5 4 1 1 0 8 1 pffrent 40 503 0 503 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 84 0 49 1 0 1 1 0 8 0 pfstkey 112 84 0 49 2 0 2 2 0 8 0 pfstate 328 84 0 49 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 256 934 0 721 22 8 14 17 0 8 0 art_table 32 935 0 721 4 1 3 3 0 8 0 art_node 16 152 0 117 1 0 1 1 0 8 0 sysvmsgpl 40 38 0 17 1 0 1 1 0 8 0 semapl 112 241 0 231 1 0 1 1 0 8 0 shmpl 112 44 0 2 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2981 0 1570 46 0 46 46 0 8 0 ffsino 272 2981 0 1570 95 0 95 95 0 8 0 nchpl 144 5311 0 3699 62 2 60 61 0 8 0 uvmvnodes 72 3593 0 0 66 0 66 66 0 8 0 vnodes 208 3593 0 0 190 0 190 190 0 8 0 namei 1024 16144 0 16144 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 12 0 1 2 0 2 2 0 8 0 vmpool 552 13 0 1 1 0 1 1 0 8 0 scsiplug 64 2 0 2 1 1 0 1 0 8 0 scxspl 192 15188 0 15188 11 10 1 7 0 8 1 plimitpl 152 92 0 84 1 0 1 1 0 8 0 sigapl 432 1349 0 1334 3 1 2 3 0 8 0 futexpl 56 24888 0 24888 1 0 1 1 0 8 1 knotepl 112 184 0 165 1 0 1 1 0 8 0 kqueuepl 104 316 0 313 4 3 1 4 0 8 0 pipepl 160 706 0 687 2 1 1 2 0 8 0 fdescpl 488 1350 0 1334 3 0 3 3 0 8 0 filepl 152 12015 0 11913 23 17 6 13 0 8 2 lockfpl 104 420 0 419 1 0 1 1 0 8 0 lockfspl 48 124 0 123 1 0 1 1 0 8 0 sessionpl 112 22 0 11 1 0 1 1 0 8 0 pgrppl 48 30 0 19 1 0 1 1 0 8 0 ucredpl 96 947 0 938 1 0 1 1 0 8 0 zombiepl 144 1334 0 1334 1 0 1 1 0 8 1 processpl 896 1367 0 1334 4 0 4 4 0 8 0 procpl 632 3805 0 3761 5 0 5 5 0 8 1 srpgc 64 8 0 8 3 2 1 1 0 8 1 sosppl 128 37 0 37 4 4 0 1 0 8 0 sockpl 384 4125 0 4103 28 23 5 14 0 8 2 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 8 0 0 1 0 1 1 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 11 0 0 2 0 2 2 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 161 0 0 20 1 19 20 0 8 0 mtagpl 80 48 0 0 1 0 1 1 0 8 0 mbufpl 256 398 0 0 24 0 24 24 0 8 0 bufpl 256 8960 0 1902 442 0 442 442 0 8 0 anonpl 16 171365 0 142082 143 21 122 138 0 124 1 amapchunkpl 152 8841 0 8140 35 8 27 30 0 158 0 amappl16 192 7383 0 5933 98 25 73 73 0 8 0 amappl15 184 852 0 851 2 1 1 1 0 8 0 amappl14 176 192 0 184 1 0 1 1 0 8 0 amappl13 168 31 0 30 3 2 1 1 0 8 0 amappl12 160 5 0 4 1 0 1 1 0 8 0 amappl11 152 65 0 50 1 0 1 1 0 8 0 amappl10 144 134 0 131 1 0 1 1 0 8 0 amappl9 136 658 0 654 1 0 1 1 0 8 0 amappl8 128 236 0 197 2 0 2 2 0 8 0 amappl7 120 190 0 182 1 0 1 1 0 8 0 amappl6 112 69 0 58 1 0 1 1 0 8 0 amappl5 104 198 0 183 1 0 1 1 0 8 0 amappl4 96 1527 0 1497 1 0 1 1 0 8 0 amappl3 88 381 0 375 1 0 1 1 0 8 0 amappl2 80 10069 0 9994 3 1 2 3 0 8 0 amappl1 72 38935 0 38490 26 16 10 20 0 8 0 amappl 80 4147 0 4092 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 45 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1363 0 1334 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1363 0 1334 1 0 1 1 0 8 0 vmmpekpl 168 13252 0 13213 2 0 2 2 0 8 0 vmmpepl 168 175543 0 172892 214 60 154 157 0 357 38 vmsppl 368 1349 0 1334 2 0 2 2 0 8 0 pdppl 4096 2733 0 2681 7 0 7 7 0 8 0 pvpl 32 458475 0 434380 255 34 221 244 0 265 20 pmappl 232 1362 0 1335 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 641 0 23 18 0 18 18 0 8 0