panic: malloc: out of space in kmem_map Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *335467 96264 0 0x2 0 0K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x174 sys/kern/subr_prf.c:208 malloc(200000,2a,9) at malloc+0xad5 sys/kern/kern_malloc.c:242 kcovioctl(1c1300,80084b01,ffff800020c11cb0,3,ffff800020b22bd0) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1c1300,80084b01,ffff800020c11cb0,3,ffff800020b22bd0) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd8068ed1238,80084b01,ffff800020c11cb0,3,fffffd807f7c6ae0,ffff800020b22bd0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8066e03868,80084b01,ffff800020c11cb0,ffff800020b22bd0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b22bd0,ffff800020c11df0,ffff800020c11de0) at sys_ioctl+0x651 syscall(ffff800020c11e90) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c11e90) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7ffffbf4d8,36,3,624f309958) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbeff0, count: 6 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 malloc: out of space in kmem_map ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x174 sys/kern/subr_prf.c:208 malloc(200000,2a,9) at malloc+0xad5 sys/kern/kern_malloc.c:242 kcovioctl(1c1300,80084b01,ffff800020c11cb0,3,ffff800020b22bd0) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1c1300,80084b01,ffff800020c11cb0,3,ffff800020b22bd0) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd8068ed1238,80084b01,ffff800020c11cb0,3,fffffd807f7c6ae0,ffff800020b22bd0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8066e03868,80084b01,ffff800020c11cb0,ffff800020b22bd0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b22bd0,ffff800020c11df0,ffff800020c11de0) at sys_ioctl+0x651 syscall(ffff800020c11e90) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c11e90) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7ffffbf4d8,36,3,624f309958) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbeff0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c118e0 rbx 0xffff800020c11990 rdx 0xffffffff81f89682 apollo_pio_rec+0x9060 rcx 0 rax 0 r8 0xffffffff8182bbb3 kprintf+0x183 r9 0x1 r10 0x25 r11 0xfdb1cbf023bfe4ad r12 0x3000000008 r13 0xffff800020c118f0 r14 0x100 r15 0x1 rip 0xffffffff81c8ebf8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c118d0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=335467 stat=onproc flags process=2 proc=0 pri=74, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff800020b224c8,0xffffffff823ddcc0 process=0xffff800020b7c018 user=0xffff800020c0c000, vmspace=0xfffffd807f00b708 estcpu=24, cpticks=2, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *96264 335467 91504 0 7 0x2 syz-executor.0 16798 237323 91504 0 3 0x82 piperd syz-executor.1 13770 381107 1 0 3 0x80 nanosleep init 81932 472174 0 0 3 0x14200 bored sosplice 91504 427674 1288 0 3 0x82 thrsleep syz-fuzzer 91504 206629 1288 0 3 0x4000082 nanosleep syz-fuzzer 91504 236012 1288 0 3 0x4000082 thrsleep syz-fuzzer 91504 438411 1288 0 3 0x4000082 thrsleep syz-fuzzer 91504 428260 1288 0 3 0x4000082 thrsleep syz-fuzzer 91504 416223 1288 0 3 0x4000082 thrsleep syz-fuzzer 91504 331708 1288 0 3 0x4000082 thrsleep syz-fuzzer 91504 60683 1288 0 3 0x4000082 thrsleep syz-fuzzer 91504 472843 1288 0 3 0x4000082 thrsleep syz-fuzzer 91504 405779 1288 0 3 0x4000082 kqread syz-fuzzer 1288 357060 17902 0 3 0x10008a pause ksh 17902 11241 74146 0 3 0x92 select sshd 74146 242808 1 0 3 0x80 select sshd 43033 329162 45545 74 3 0x100092 bpf pflogd 45545 334465 1 0 3 0x80 netio pflogd 82379 283561 53976 73 3 0x100090 kqread syslogd 53976 282400 1 0 3 0x100082 netio syslogd 96732 233527 1 77 3 0x100090 poll dhclient 67771 156658 1 0 3 0x80 poll dhclient 17936 286813 0 0 3 0x14200 pgzero zerothread 19316 139354 0 0 3 0x14200 aiodoned aiodoned 45106 12646 0 0 3 0x14200 syncer update 8734 45007 0 0 3 0x14200 cleaner cleaner 31096 32666 0 0 3 0x14200 reaper reaper 45637 296597 0 0 3 0x14200 pgdaemon pagedaemon 99897 320979 0 0 3 0x14200 bored crynlk 1812 441536 0 0 3 0x14200 bored crypto 95774 108035 0 0 3 0x40014200 acpi0 acpi0 3855 120600 0 0 7 0x40014200 idle1 66583 399122 0 0 3 0x14200 bored softnet 86200 142756 0 0 3 0x14200 bored systqmp 17577 363232 0 0 3 0x14200 bored systq 20873 377533 0 0 3 0x40014200 bored softclock 91887 48101 0 0 3 0x40014200 idle0 54127 296012 0 0 3 0x14200 bored smr 1 113167 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 96264 (syz-executor.0) thread 0xffff800020b22bd0 (335467) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823d1188) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 syscall+0x48b mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x48b sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9504 71948K 71956K 78643K 10733 0 0 pcb 25 9K 11K 78643K 321 0 0 rtable 82 3K 4K 78643K 401 0 0 ifaddr 50 11K 13K 78643K 131 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1473 0 0 iov 0 0K 16K 78643K 36 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1200 75K 75K 78643K 1466 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 7 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 47 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 4 9K 21K 78643K 402 0 0 sigio 0 0K 0K 78643K 6 0 0 proc 47 38K 71K 78643K 455 0 0 subproc 55 57345K 67586K 78643K 227 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 63 0 0 in_multi 22 1K 2K 78643K 89 0 0 ether_multi 1 0K 0K 78643K 2 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 231 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 80 12K 30K 78643K 2136 0 0 UVM aobj 23 2K 2K 78643K 24 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 8 0 0 NDP 10 0K 0K 78643K 39 0 0 temp 131 2373K 3010K 78643K 4439 0 0 kqueue 0 0K 0K 78643K 2 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 8 0 5 1 0 1 1 0 8 0 inpcbpl 280 266 0 259 1 0 1 1 0 8 0 plimitpl 152 36 0 29 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 77 0 46 2 0 2 2 0 8 1 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 85 0 81 1 0 1 1 0 8 0 nd6 48 12 0 10 1 0 1 1 0 8 0 ppxss 1128 11 0 11 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 23 0 6 1 0 1 1 0 8 0 pfstkey 112 23 0 6 1 0 1 1 0 8 0 pfstate 328 23 0 6 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 256 362 0 215 12 0 12 12 0 8 2 art_table 32 363 0 215 2 0 2 2 0 8 0 art_node 16 76 0 48 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 45 0 35 1 0 1 1 0 8 0 shmpl 112 22 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2091 0 659 47 0 47 47 0 8 0 ffsino 272 2091 0 659 96 0 96 96 0 8 0 nchpl 144 2830 0 1183 62 0 62 62 0 8 0 uvmvnodes 72 2238 0 0 41 0 41 41 0 8 0 vnodes 200 2238 0 0 118 0 118 118 0 8 0 namei 1024 8143 0 8143 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 7539 0 7539 10 7 3 5 0 8 3 sigapl 432 586 0 572 2 0 2 2 0 8 0 futexpl 56 4313 0 4313 1 0 1 1 0 8 1 knotepl 112 233 0 204 2 1 1 2 0 8 0 kqueuepl 104 121 0 119 1 0 1 1 0 8 0 pipepl 112 380 0 361 3 2 1 2 0 8 0 fdescpl 488 587 0 572 4 1 3 3 0 8 0 filepl 152 3592 0 3499 6 1 5 6 0 8 1 lockfpl 104 125 0 125 2 1 1 1 0 8 1 lockfspl 32 227 0 227 2 1 1 1 0 8 1 sessionpl 112 24 0 15 1 0 1 1 0 8 0 pgrppl 48 30 0 21 1 0 1 1 0 8 0 ucredpl 96 693 0 684 1 0 1 1 0 8 0 zombiepl 144 572 0 572 2 1 1 1 0 8 1 processpl 840 603 0 572 4 0 4 4 0 8 0 procpl 600 1394 0 1354 4 0 4 4 0 8 0 srpgc 64 28 0 28 2 1 1 1 0 8 1 sosppl 128 2 0 2 1 1 0 1 0 8 0 sockpl 384 532 0 513 5 1 4 4 0 8 2 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 116 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 132 0 0 8 0 8 8 0 8 0 bufpl 256 5976 0 1053 308 0 308 308 0 8 0 anonpl 16 65267 0 58403 53 5 48 51 0 125 13 amapchunkpl 152 3216 0 3131 9 2 7 9 0 158 2 amappl16 192 2345 0 1898 36 7 29 36 0 8 5 amappl15 184 144 0 142 1 0 1 1 0 8 0 amappl14 176 36 0 30 1 0 1 1 0 8 0 amappl13 168 65 0 61 1 0 1 1 0 8 0 amappl12 160 73 0 72 2 1 1 1 0 8 0 amappl11 152 352 0 339 1 0 1 1 0 8 0 amappl10 144 84 0 78 1 0 1 1 0 8 0 amappl9 136 493 0 489 1 0 1 1 0 8 0 amappl8 128 215 0 199 1 0 1 1 0 8 0 amappl7 120 63 0 56 1 0 1 1 0 8 0 amappl6 112 66 0 57 1 0 1 1 0 8 0 amappl5 104 270 0 255 1 0 1 1 0 8 0 amappl4 96 330 0 307 2 1 1 2 0 8 0 amappl3 88 138 0 132 1 0 1 1 0 8 0 amappl2 80 4253 0 4212 2 0 2 2 0 8 0 amappl1 72 22242 0 21845 24 14 10 19 0 8 0 amappl 72 1661 0 1629 1 0 1 1 0 75 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 dma64 64 259 0 259 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 23 0 1 1 0 1 1 0 8 0 uaddrrnd 24 587 0 572 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 587 0 572 1 0 1 1 0 8 0 vmmpekpl 168 8724 0 8696 2 0 2 2 0 8 0 vmmpepl 168 71292 0 69984 104 26 78 79 0 357 9 vmsppl 360 586 0 572 2 0 2 2 0 8 0 pdppl 4096 1182 0 1144 7 1 6 6 0 8 0 pvpl 32 218373 0 208579 137 9 128 131 0 265 30 pmappl 224 586 0 572 2 0 2 2 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 460 0 5 13 0 13 13 0 8 0