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 *488553 40493 0 0 0x4000000 0K syz-executor.1 348078 95158 0 0x14000 0x200 1 reaper 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(ffff800000b36400,f1000,2000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b36400,0,7,fffffd807f007000,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b36400,0,7,fffffd807f007000,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800021b5e230,ffff800020acf658) 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(fffffd807371ba90,c5005601,ffff800000b5b800,1,fffffd807f7c6a20,ffff800020acf658) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806ca3c010,c5005601,ffff800000b5b800,ffff800020acf658) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020acf658,ffff800023be1088,ffff800023be10d0) at sys_ioctl+0x5b9 syscall(ffff800023be1150) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023be1150) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2e397880d0, 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(ffff800000b36400,f1000,2000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3708 uvm_share(ffff800000b36400,0,7,fffffd807f007000,20800000,200000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3767 [inline] uvm_share(ffff800000b36400,0,7,fffffd807f007000,20800000,200000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3668 vm_impl_init_vmx(ffff800021b5e230,ffff800020acf658) 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(fffffd807371ba90,c5005601,ffff800000b5b800,1,fffffd807f7c6a20,ffff800020acf658) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806ca3c010,c5005601,ffff800000b5b800,ffff800020acf658) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020acf658,ffff800023be1088,ffff800023be10d0) at sys_ioctl+0x5b9 syscall(ffff800023be1150) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023be1150) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb2e397880d0, count: -11 ddb{0}> show registers rdi 0xffffffff81e8ddc7 db_enter+0x17 rsi 0x2142 __ALIGN_SIZE+0x1142 rbp 0xffff800023be0ab0 rbx 0xffff800023be0b60 rdx 0x2143 __ALIGN_SIZE+0x1143 rcx 0xffff80002259e000 rax 0xffff80002259e000 r8 0xffffffff81298dcf kprintf+0x16f r9 0x1 r10 0x25 r11 0x5ed3311501de2363 r12 0x3000000008 r13 0xffff800023be0ac0 r14 0x100 r15 0x1 rip 0xffffffff81e8ddc8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023be0aa0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=488553 stat=onproc flags process=0 proc=4000000 pri=70, usrpri=70, nice=20 forw=0xffffffffffffffff, list=0xffff800020acea00,0xffffffff82648da8 process=0xffff800020adc000 user=0xffff800023bdc000, vmspace=0xfffffd807f007000 estcpu=20, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40493 261261 16168 0 2 0 syz-executor.1 40493 334096 16168 0 2 0x4000000 syz-executor.1 *40493 488553 16168 0 7 0x4000000 syz-executor.1 72838 380119 39024 0 3 0x82 nanosleep syz-executor.0 16168 122198 39024 0 3 0x82 nanosleep syz-executor.1 22837 254446 1 0 3 0x100083 ttyin getty 69383 374044 0 0 3 0x14200 acct acct 60802 61428 0 0 3 0x14200 bored sosplice 39024 50324 78099 0 3 0x82 thrsleep syz-fuzzer 39024 228207 78099 0 2 0x4000482 syz-fuzzer 39024 38697 78099 0 3 0x4000082 thrsleep syz-fuzzer 39024 288862 78099 0 3 0x4000082 thrsleep syz-fuzzer 39024 319721 78099 0 3 0x4000082 thrsleep syz-fuzzer 39024 185314 78099 0 3 0x4000082 thrsleep syz-fuzzer 39024 521039 78099 0 3 0x4000082 thrsleep syz-fuzzer 39024 170750 78099 0 3 0x4000082 thrsleep syz-fuzzer 39024 244805 78099 0 3 0x4000082 kqread syz-fuzzer 39024 126476 78099 0 3 0x4000082 thrsleep syz-fuzzer 78099 101684 77022 0 3 0x10008a pause ksh 77022 439625 50953 0 3 0x92 select sshd 50953 454879 1 0 3 0x80 select sshd 17054 466333 86871 74 3 0x100092 bpf pflogd 86871 345104 1 0 3 0x80 netio pflogd 16080 428349 13300 73 3 0x100090 kqread syslogd 13300 298672 1 0 3 0x100082 netio syslogd 61235 155055 1 77 3 0x100090 poll dhclient 88766 18932 1 0 3 0x80 poll dhclient 32435 72200 0 0 2 0x14200 zerothread 25124 390640 0 0 3 0x14200 aiodoned aiodoned 95588 380353 0 0 3 0x14200 syncer update 68893 266983 0 0 3 0x14200 cleaner cleaner 95158 348078 0 0 7 0x14200 reaper 87448 194280 0 0 3 0x14200 pgdaemon pagedaemon 90096 426169 0 0 3 0x14200 bored crynlk 45459 515491 0 0 3 0x14200 bored crypto 30071 452208 0 0 3 0x40014200 acpi0 acpi0 72768 321958 0 0 3 0x40014200 idle1 14826 199873 0 0 3 0x14200 bored softnet 15112 194726 0 0 3 0x14200 bored systqmp 72587 450733 0 0 2 0x14200 systq 95781 141455 0 0 3 0x40014200 bored softclock 94751 376499 0 0 3 0x40014200 idle0 47334 248389 0 0 3 0x14200 bored smr 1 168640 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd80076cc8f8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_remove_ptes+0x233 pmap_remove_pv sys/arch/amd64/amd64/pmap.c:979 [inline] #3 pmap_remove_ptes+0x233 sys/arch/amd64/amd64/pmap.c:1572 #4 pmap_do_remove+0x401 sys/arch/amd64/amd64/pmap.c:1780 #5 uvm_map_teardown+0x195 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:206 [inline] #5 uvm_map_teardown+0x195 sys/uvm/uvm_map.c:2719 #6 uvmspace_free+0x86 sys/uvm/uvm_map.c:3592 #7 uvm_exit+0x29 sys/uvm/uvm_glue.c:297 #8 reaper+0x189 sys/kern/kern_exit.c:442 #9 proc_trampoline+0x1c exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd8061473760) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_do_remove+0x88 rcr3 machine/cpufunc.h:141 [inline] #3 pmap_do_remove+0x88 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline] #3 pmap_do_remove+0x88 sys/arch/amd64/amd64/pmap.c:1684 #4 uvm_map_teardown+0x195 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:206 [inline] #4 uvm_map_teardown+0x195 sys/uvm/uvm_map.c:2719 #5 uvmspace_free+0x86 sys/uvm/uvm_map.c:3592 #6 uvm_exit+0x29 sys/uvm/uvm_glue.c:297 #7 reaper+0x189 sys/kern/kern_exit.c:442 #8 proc_trampoline+0x1c Process 40493 (syz-executor.1) thread 0xffff800020acf658 (488553) shared rwlock vmmaplk r = 0 (0xfffffd807f007018) #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 (0xffff800000b36418) #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 9563 6564K 8687K 78643K 18191 0 0 pcb 13 10K 12K 78643K 326 0 0 rtable 97 12K 13K 78643K 1172 0 0 ifaddr 148 20K 22K 78643K 417 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 1 2K 4K 78643K 1560 0 0 iov 0 0K 24K 78643K 264 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1229 77K 78K 78643K 3500 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 19 0 0 VM map 23 11K 11K 78643K 24 0 0 sem 11 1K 1K 78643K 13 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1809 196K 290K 78643K 12766 0 0 file desc 5 13K 25K 78643K 1387 0 0 sigio 0 0K 0K 78643K 26 0 0 proc 60 63K 95K 78643K 948 0 0 subproc 32 2K 2K 78643K 204 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 140 0 0 in_multi 98 5K 6K 78643K 287 0 0 ether_multi 1 0K 0K 78643K 18 0 0 mrt 0 0K 0K 78643K 16 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 488 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 168 192K 192K 78643K 5848 0 0 UVM aobj 130 5K 5K 78643K 135 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 2K 78643K 337 0 0 NDP 17 0K 0K 78643K 104 0 0 temp 157 3555K 4191K 78643K 78777 0 0 kqueue 0 0K 0K 78643K 21 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 40 0 36 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 219 0 217 1 0 1 1 0 8 0 rtentry 112 205 0 171 2 0 2 2 0 8 0 unpcb 120 879 0 866 1 0 1 1 0 8 0 syncache 264 13 0 13 6 5 1 1 0 8 1 tcpqe 32 134 0 134 5 4 1 1 0 8 1 tcpcb 544 999 0 995 24 23 1 13 0 8 0 inpcb 280 2665 0 2658 18 16 2 9 0 8 1 rttmr 72 8 0 7 1 0 1 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 29 0 27 1 0 1 1 0 8 0 pkpcb 40 14 0 14 4 4 0 1 0 8 0 ppxss 1128 29 0 29 4 3 1 1 0 8 1 pffrag 232 32 0 32 6 5 1 1 0 482 1 pffrnode 88 32 0 32 6 5 1 1 0 8 1 pffrent 40 684 0 684 6 5 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 24 139 0 60 1 0 1 1 0 8 0 pfstkey 112 139 0 60 3 0 3 3 0 8 0 pfstate 328 139 0 60 7 0 7 7 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 1 3 1 2 2 0 8 0 art_heap4 256 951 0 724 20 3 17 17 0 8 2 art_table 32 954 0 725 3 0 3 3 0 8 0 art_node 16 202 0 170 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 20 2 1 1 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 133 0 5 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3550 0 2140 46 0 46 46 0 8 0 ffsino 272 3550 0 2140 95 0 95 95 0 8 0 nchpl 144 5792 0 5337 61 40 21 61 0 8 0 uvmvnodes 72 5478 0 0 100 0 100 100 0 8 0 vnodes 208 5478 0 0 289 0 289 289 0 8 0 namei 1024 20773 0 20773 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 20 0 0 3 0 3 3 0 8 0 vmpool 552 22 0 1 2 0 2 2 0 8 0 scsiplug 64 5 0 5 3 3 0 1 0 8 0 scxspl 192 17327 0 17327 15 14 1 7 0 8 1 plimitpl 152 135 0 127 1 0 1 1 0 8 0 sigapl 432 1557 0 1542 3 1 2 3 0 8 0 futexpl 56 39008 0 39008 1 0 1 1 0 8 1 knotepl 112 410 0 391 2 1 1 2 0 8 0 kqueuepl 104 1204 0 1200 7 6 1 4 0 8 0 pipepl 160 2096 0 2077 4 2 2 3 0 8 1 fdescpl 488 1558 0 1542 3 0 3 3 0 8 0 filepl 152 15959 0 15851 26 20 6 14 0 8 1 lockfpl 104 682 0 681 1 0 1 1 0 8 0 lockfspl 48 207 0 206 1 0 1 1 0 8 0 sessionpl 112 30 0 19 1 0 1 1 0 8 0 pgrppl 48 56 0 45 1 0 1 1 0 8 0 ucredpl 96 1996 0 1986 1 0 1 1 0 8 0 zombiepl 144 1542 0 1541 1 0 1 1 0 8 0 processpl 896 1575 0 1541 4 0 4 4 0 8 0 procpl 632 4528 0 4483 5 0 5 5 0 8 0 srpgc 64 18 0 18 6 5 1 1 0 8 1 sosppl 128 121 0 121 4 4 0 1 0 8 0 sockpl 384 3841 0 3819 27 22 5 14 0 8 2 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 173 0 0 21 0 21 21 0 8 0 mtagpl 80 31 0 0 1 0 1 1 0 8 0 mbufpl 256 451 0 0 23 0 23 23 0 8 0 bufpl 256 10327 0 3269 442 0 442 442 0 8 0 anonpl 16 212707 0 183840 148 32 116 116 0 124 0 amapchunkpl 152 11731 0 11341 28 13 15 15 0 158 0 amappl16 192 8078 0 6647 98 26 72 73 0 8 0 amappl15 184 435 0 434 1 0 1 1 0 8 0 amappl14 176 393 0 388 1 0 1 1 0 8 0 amappl12 160 196 0 192 1 0 1 1 0 8 0 amappl11 152 141 0 126 1 0 1 1 0 8 0 amappl10 144 97 0 88 1 0 1 1 0 8 0 amappl9 136 730 0 726 1 0 1 1 0 8 0 amappl8 128 327 0 283 2 0 2 2 0 8 0 amappl7 120 170 0 161 1 0 1 1 0 8 0 amappl6 112 146 0 134 1 0 1 1 0 8 0 amappl5 104 398 0 384 1 0 1 1 0 8 0 amappl4 96 1635 0 1597 2 1 1 2 0 8 0 amappl3 88 609 0 601 1 0 1 1 0 8 0 amappl2 80 11198 0 11117 3 1 2 3 0 8 0 amappl1 72 45675 0 45216 26 16 10 20 0 8 0 amappl 80 4972 0 4907 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 64 134 0 5 3 0 3 3 0 8 0 uaddrrnd 24 1580 0 1542 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1580 0 1542 1 0 1 1 0 8 0 vmmpekpl 168 18913 0 18873 3 0 3 3 0 8 0 vmmpepl 168 206778 0 203994 204 49 155 158 0 357 33 vmsppl 368 1557 0 1541 2 0 2 2 0 8 0 pdppl 4096 3167 0 3104 8 0 8 8 0 8 0 pvpl 32 553220 0 522918 314 52 262 262 0 265 16 pmappl 232 1579 0 1542 3 0 3 3 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 655 0 30 18 0 18 18 0 8 0