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 *204788 52044 0 0 0x4000000 0 syz-executor.1 449585 4680 0 0x2 0x80 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(ffff800000aa7c00,e000,cf0000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3704 uvm_share(ffff800000aa7c00,0,7,fffffd807f00ba10,20002000,80000000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3763 [inline] uvm_share(ffff800000aa7c00,0,7,fffffd807f00ba10,20002000,80000000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3664 vm_impl_init_vmx(ffff800020b279e0,ffff800020ab0018) 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(fffffd806e173a90,c5005601,ffff800000ad5000,1,fffffd807f7c67e0,ffff800020ab0018) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd80661976a8,c5005601,ffff800000ad5000,ffff800020ab0018) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020ab0018,ffff800021573ab8,ffff800021573b00) at sys_ioctl+0x5b9 syscall(ffff800021573b80) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021573b80) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff59,0,3,c2919f8b010) at Xsyscall+0x128 end of kernel end trace frame: 0xc2bce94a2b0, 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(ffff800000aa7c00,e000,cf0000,0,7,7) at uvm_mapent_clone+0x1de sys/uvm/uvm_map.c:3704 uvm_share(ffff800000aa7c00,0,7,fffffd807f00ba10,20002000,80000000) at uvm_share+0x4b4 uvm_mapent_share sys/uvm/uvm_map.c:3763 [inline] uvm_share(ffff800000aa7c00,0,7,fffffd807f00ba10,20002000,80000000) at uvm_share+0x4b4 sys/uvm/uvm_map.c:3664 vm_impl_init_vmx(ffff800020b279e0,ffff800020ab0018) 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(fffffd806e173a90,c5005601,ffff800000ad5000,1,fffffd807f7c67e0,ffff800020ab0018) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd80661976a8,c5005601,ffff800000ad5000,ffff800020ab0018) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020ab0018,ffff800021573ab8,ffff800021573b00) at sys_ioctl+0x5b9 syscall(ffff800021573b80) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021573b80) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff59,0,3,c2919f8b010) at Xsyscall+0x128 end of kernel end trace frame: 0xc2bce94a2b0, count: -11 ddb{0}> show registers rdi 0xffffffff819807c7 db_enter+0x17 rsi 0x307c __ALIGN_SIZE+0x207c rbp 0xffff8000215734e0 rbx 0xffff800021573590 rdx 0x307d __ALIGN_SIZE+0x207d rcx 0xffff800021b7c000 rax 0xffff800021b7c000 r8 0xffffffff81186cff kprintf+0x16f r9 0x1 r10 0x25 r11 0x1332d30b9b48cceb r12 0x3000000008 r13 0xffff8000215734f0 r14 0x100 r15 0x1 rip 0xffffffff819807c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000215734d0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=204788 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0c70,0xffffffff826330d0 process=0xffff800020adc380 user=0xffff80002156e000, vmspace=0xfffffd807f00ba10 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 52044 274596 78282 0 2 0 syz-executor.1 *52044 204788 78282 0 7 0x4000000 syz-executor.1 78282 327829 4680 0 3 0x82 nanosleep syz-executor.1 20927 47423 4680 0 2 0x2 syz-executor.0 4680 449585 89494 0 7 0x82 syz-fuzzer 4680 183059 89494 0 3 0x4000082 nanosleep syz-fuzzer 4680 339064 89494 0 3 0x4000082 thrsleep syz-fuzzer 4680 171079 89494 0 3 0x4000082 thrsleep syz-fuzzer 4680 173834 89494 0 3 0x4000082 thrsleep syz-fuzzer 4680 32734 89494 0 3 0x4000082 thrsleep syz-fuzzer 4680 398413 89494 0 3 0x4000082 thrsleep syz-fuzzer 4680 120475 89494 0 3 0x4000082 thrsleep syz-fuzzer 4680 262186 89494 0 3 0x4000082 thrsleep syz-fuzzer 4680 344672 89494 0 3 0x4000082 nanosleep syz-fuzzer 89494 111778 50401 0 3 0x10008a pause ksh 50401 353271 88853 0 3 0x92 select sshd 40121 342972 1 0 3 0x100083 ttyin getty 88853 492070 1 0 3 0x80 select sshd 31560 127025 99213 74 3 0x100092 bpf pflogd 99213 340712 1 0 3 0x80 netio pflogd 77166 151606 53760 73 3 0x100090 kqread syslogd 53760 349694 1 0 3 0x100082 netio syslogd 2304 99921 1 77 3 0x100090 poll dhclient 90233 171168 1 0 3 0x80 poll dhclient 33127 269318 0 0 3 0x14200 pgzero zerothread 93791 488487 0 0 3 0x14200 aiodoned aiodoned 49911 92735 0 0 3 0x14200 syncer update 65585 202456 0 0 3 0x14200 cleaner cleaner 89435 93973 0 0 3 0x14200 reaper reaper 51129 507757 0 0 3 0x14200 pgdaemon pagedaemon 13359 347826 0 0 3 0x14200 bored crynlk 8927 487222 0 0 3 0x14200 bored crypto 81765 504967 0 0 3 0x40014200 acpi0 acpi0 63571 141346 0 0 3 0x40014200 idle1 71779 22183 0 0 3 0x14200 bored softnet 5313 378155 0 0 3 0x14200 bored systqmp 61893 146451 0 0 3 0x14200 bored systq 44506 269087 0 0 2 0x40014200 softclock 39156 386184 0 0 3 0x40014200 idle0 61201 344467 0 0 3 0x14200 bored smr 1 372925 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 52044 (syz-executor.1) thread 0xffff800020ab0018 (204788) shared rwlock vmmaplk r = 0 (0xfffffd807f00ba28) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 uvm_share+0xcf vm_map_lock_read_ln sys/uvm/uvm_map.c:5361 [inline] #1 uvm_share+0xcf sys/uvm/uvm_map.c:3623 #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:524 #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 (0xffff800000aa7c18) #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:5339 #3 uvm_share+0xa7 vm_map_lock_read_ln sys/uvm/uvm_map.c:5360 [inline] #3 uvm_share+0xa7 sys/uvm/uvm_map.c:3623 #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:524 #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 (0xffff80000066e478) #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:524 #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 (0xffffffff82631ba8) #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 9493 6524K 6842K 78643K 10709 0 0 pcb 13 8K 8K 78643K 33 0 0 rtable 106 4K 4K 78643K 232 0 0 ifaddr 46 11K 11K 78643K 56 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 1 2K 4K 78643K 1472 0 0 iov 0 0K 12K 78643K 8 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1220 77K 77K 78643K 1269 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 3 0 0 VM map 3 1K 1K 78643K 3 0 0 sem 12 0K 1K 78643K 20 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 85 0 0 proc 60 63K 83K 78643K 442 0 0 subproc 32 2K 2K 78643K 34 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 3 0 0 in_multi 33 2K 2K 78643K 33 0 0 ether_multi 1 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 36 159K 159K 78643K 36 0 0 exec 0 0K 1K 78643K 213 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 97 21K 22K 78643K 1170 0 0 UVM aobj 7 2K 2K 78643K 8 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 16 0 0 NDP 8 0K 0K 78643K 14 0 0 temp 113 3547K 3611K 78643K 3656 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 7 0 1 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 21 0 19 1 0 1 1 0 8 0 rtentry 112 49 0 6 2 0 2 2 0 8 0 unpcb 120 71 0 61 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 6231 0 6231 2 1 1 2 0 8 1 tcpcb 544 66 0 60 1 0 1 1 0 8 0 inpcb 280 159 0 152 2 0 2 2 0 8 1 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 2 0 2 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 22 0 2 1 0 1 1 0 8 0 pfstkey 112 22 0 2 1 0 1 1 0 8 0 pfstate 328 22 0 2 2 0 2 2 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 256 219 0 3 14 0 14 14 0 8 0 art_table 32 220 0 3 2 0 2 2 0 8 0 art_node 16 47 0 8 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 1 0 1 1 0 8 1 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 6 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1511 0 106 46 0 46 46 0 8 0 ffsino 272 1511 0 106 94 0 94 94 0 8 0 nchpl 144 1840 0 217 61 0 61 61 0 8 0 uvmvnodes 72 1589 0 0 29 0 29 29 0 8 0 vnodes 208 1589 0 0 84 0 84 84 0 8 0 namei 1024 4742 0 4742 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vmpool 552 1 0 0 1 0 1 1 0 8 0 scxspl 192 5016 0 5016 9 8 1 7 0 8 1 plimitpl 152 16 0 8 1 0 1 1 0 8 0 sigapl 432 285 0 270 3 0 3 3 0 8 1 futexpl 56 1212 0 1212 1 0 1 1 0 8 1 knotepl 112 54 0 35 1 0 1 1 0 8 0 kqueuepl 104 12 0 10 1 0 1 1 0 8 0 pipepl 112 218 0 199 2 1 1 1 0 8 0 fdescpl 488 286 0 270 3 0 3 3 0 8 0 filepl 152 1614 0 1513 6 1 5 5 0 8 1 lockfpl 104 28 0 27 1 0 1 1 0 8 0 lockfspl 48 10 0 9 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 107 0 98 1 0 1 1 0 8 0 zombiepl 144 270 0 270 3 2 1 1 0 8 1 processpl 896 301 0 270 4 0 4 4 0 8 0 procpl 632 424 0 383 5 0 5 5 0 8 1 sockpl 384 251 0 232 5 1 4 4 0 8 2 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 238 0 0 29 0 29 29 0 8 0 mtagpl 80 7 0 0 1 0 1 1 0 8 0 mbufpl 256 275 0 0 17 0 17 17 0 8 0 bufpl 256 6257 0 1315 309 0 309 309 0 8 0 anonpl 16 41103 0 25114 67 2 65 65 0 124 0 amapchunkpl 152 1282 0 1174 7 1 6 6 0 158 0 amappl16 192 1243 0 347 46 0 46 46 0 8 1 amappl14 176 54 0 52 2 1 1 1 0 8 0 amappl13 168 3 0 1 1 0 1 1 0 8 0 amappl12 160 33 0 29 2 1 1 1 0 8 0 amappl11 152 54 0 39 1 0 1 1 0 8 0 amappl10 144 14 0 9 1 0 1 1 0 8 0 amappl9 136 618 0 612 1 0 1 1 0 8 0 amappl8 128 165 0 144 1 0 1 1 0 8 0 amappl7 120 39 0 35 1 0 1 1 0 8 0 amappl6 112 77 0 67 1 0 1 1 0 8 0 amappl5 104 158 0 142 1 0 1 1 0 8 0 amappl4 96 518 0 488 1 0 1 1 0 8 0 amappl3 88 158 0 152 1 0 1 1 0 8 0 amappl2 80 1332 0 1259 4 2 2 3 0 8 0 amappl1 72 16143 0 15715 25 15 10 20 0 8 0 amappl 80 665 0 627 1 0 1 1 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 287 0 270 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 287 0 270 1 0 1 1 0 8 0 vmmpekpl 168 6360 0 6324 2 0 2 2 0 8 0 vmmpepl 168 41741 0 39727 141 26 115 115 0 357 26 vmsppl 368 285 0 270 2 0 2 2 0 8 0 pdppl 4096 581 0 540 7 1 6 6 0 8 0 pvpl 32 143531 0 124419 180 20 160 160 0 265 5 pmappl 232 286 0 270 2 0 2 2 0 8 1 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 487 0 5 14 0 14 14 0 8 0