panic: malloc: out of space in kmem_map Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *174081 32836 0 0x2 0 1K syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 malloc(200000,2a,9) at malloc+0xad5 sys/kern/kern_malloc.c:242 kcovioctl(1b1300,80084b01,ffff800020c239a0,3,ffff800020b64978) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1b1300,80084b01,ffff800020c239a0,3,ffff800020b64978) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd8062663748,80084b01,ffff800020c239a0,3,fffffd807f7c69c0,ffff800020b64978) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806785b900,80084b01,ffff800020c239a0,ffff800020b64978) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b64978,ffff800020c23ae0,ffff800020c23ad0) at sys_ioctl+0x651 syscall(ffff800020c23b80) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c23b80) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7ffffe2528,36,3,77bf86bb890) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe2040, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic malloc: out of space in kmem_map ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 malloc(200000,2a,9) at malloc+0xad5 sys/kern/kern_malloc.c:242 kcovioctl(1b1300,80084b01,ffff800020c239a0,3,ffff800020b64978) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1b1300,80084b01,ffff800020c239a0,3,ffff800020b64978) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd8062663748,80084b01,ffff800020c239a0,3,fffffd807f7c69c0,ffff800020b64978) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806785b900,80084b01,ffff800020c239a0,ffff800020b64978) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b64978,ffff800020c23ae0,ffff800020c23ad0) at sys_ioctl+0x651 syscall(ffff800020c23b80) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c23b80) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7ffffe2528,36,3,77bf86bb890) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe2040, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c235d0 rbx 0xffff800020c23680 rdx 0xffffffff81f8b510 cy_pio_rec+0xb6d rcx 0 rax 0 r8 0xffffffff818b7283 kprintf+0x183 r9 0x1 r10 0x25 r11 0x3f901054ac45f24e r12 0x3000000008 r13 0xffff800020c235e0 r14 0x100 r15 0x1 rip 0xffffffff8151a288 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c235c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=174081 stat=onproc flags process=2 proc=0 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020b04260,0xffffffff8235e518 process=0xffff800020b7c018 user=0xffff800020c1e000, vmspace=0xfffffd807f00bb40 estcpu=1, cpticks=3, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *32836 174081 33480 0 7 0x2 syz-executor.1 58478 460846 33480 0 3 0x82 piperd syz-executor.0 33480 52885 24381 0 3 0x82 thrsleep syz-fuzzer 33480 182742 24381 0 3 0x4000082 thrsleep syz-fuzzer 33480 478319 24381 0 3 0x4000082 thrsleep syz-fuzzer 33480 250733 24381 0 3 0x4000082 kqread syz-fuzzer 33480 356623 24381 0 3 0x4000082 thrsleep syz-fuzzer 33480 276860 24381 0 3 0x4000082 thrsleep syz-fuzzer 33480 344900 24381 0 3 0x4000082 thrsleep syz-fuzzer 33480 58701 24381 0 3 0x4000082 thrsleep syz-fuzzer 33480 160763 24381 0 3 0x4000082 thrsleep syz-fuzzer 33480 479394 24381 0 3 0x4000082 thrsleep syz-fuzzer 24381 202326 77186 0 3 0x10008a pause ksh 77186 236618 59096 0 3 0x92 select sshd 83815 244238 1 0 3 0x100083 ttyin getty 59096 100535 1 0 3 0x80 select sshd 33311 210773 28583 74 3 0x100092 bpf pflogd 28583 266915 1 0 3 0x80 netio pflogd 9296 290685 13856 73 3 0x100090 kqread syslogd 13856 180008 1 0 3 0x100082 netio syslogd 58323 251920 1 77 3 0x100090 poll dhclient 42664 376268 1 0 3 0x80 poll dhclient 36940 351036 0 0 3 0x14200 pgzero zerothread 41982 322827 0 0 3 0x14200 aiodoned aiodoned 69232 248805 0 0 3 0x14200 syncer update 69281 411863 0 0 3 0x14200 cleaner cleaner 60981 423505 0 0 3 0x14200 reaper reaper 66753 51782 0 0 3 0x14200 pgdaemon pagedaemon 4517 351538 0 0 3 0x14200 bored crynlk 70402 252606 0 0 3 0x14200 bored crypto 9439 422445 0 0 3 0x40014200 acpi0 acpi0 1450 347833 0 0 3 0x40014200 idle1 38636 269527 0 0 3 0x14200 bored softnet 39268 280914 0 0 3 0x14200 bored systqmp 11913 238055 0 0 3 0x14200 bored systq 42228 447957 0 0 3 0x40014200 bored softclock 53545 88591 0 0 7 0x40014200 idle0 63533 363705 0 0 3 0x14200 bored smr 1 184387 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 32836 (syz-executor.1) thread 0xffff800020b64978 (174081) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8234bf90) 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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9459 71933K 71941K 78643K 10556 0 0 pcb 25 9K 10K 78643K 63 0 0 rtable 79 2K 3K 78643K 183 0 0 ifaddr 32 9K 10K 78643K 39 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1469 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1201 75K 75K 78643K 1225 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 4 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 6 0K 0K 78643K 6 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 4 9K 21K 78643K 36 0 0 proc 53 50K 71K 78643K 322 0 0 subproc 53 55297K 67586K 78643K 89 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 22 1K 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 195 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 76 12K 21K 78643K 930 0 0 UVM aobj 4 2K 2K 78643K 4 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 5 0K 0K 78643K 10 0 0 temp 76 2364K 2429K 78643K 3230 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 1 1 0 1 1 0 8 0 inpcbpl 280 45 0 38 1 0 1 1 0 8 0 plimitpl 152 16 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 41 0 10 2 0 2 2 0 8 1 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 30 0 30 1 0 1 1 0 8 1 tcpcb 544 14 0 10 1 0 1 1 0 8 0 nd6 48 4 0 2 1 0 1 1 0 8 0 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 12 0 2 1 0 1 1 0 8 0 pfstkey 112 12 0 2 1 0 1 1 0 8 0 pfstate 328 12 0 2 1 0 1 1 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 256 185 0 41 12 0 12 12 0 8 3 art_table 32 186 0 41 2 0 2 2 0 8 0 art_node 16 40 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semapl 112 4 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1470 0 49 46 0 46 46 0 8 0 ffsino 272 1470 0 49 95 0 95 95 0 8 0 nchpl 144 1721 0 90 61 0 61 61 0 8 0 uvmvnodes 72 1525 0 0 28 0 28 28 0 8 0 vnodes 200 1525 0 0 81 0 81 81 0 8 0 namei 1024 4386 0 4386 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4231 0 4231 7 4 3 6 0 8 3 sigapl 432 232 0 218 2 0 2 2 0 8 0 futexpl 56 280 0 280 1 0 1 1 0 8 1 knotepl 112 67 0 46 1 0 1 1 0 8 0 kqueuepl 104 2 0 0 1 0 1 1 0 8 0 pipepl 112 158 0 139 2 1 1 1 0 8 0 fdescpl 488 233 0 218 3 0 3 3 0 8 0 filepl 152 1184 0 1091 5 0 5 5 0 8 1 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 32 3 0 3 1 1 0 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 18 0 8 1 0 1 1 0 8 0 ucredpl 96 61 0 52 1 0 1 1 0 8 0 zombiepl 144 218 0 218 2 1 1 1 0 8 1 processpl 840 248 0 218 4 0 4 4 0 8 0 procpl 600 289 0 250 4 0 4 4 0 8 0 srpgc 64 6 0 6 1 0 1 1 0 8 1 sockpl 384 95 0 76 3 0 3 3 0 8 1 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 120 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 142 0 0 8 0 8 8 0 8 0 bufpl 256 5668 0 1143 283 0 283 283 0 8 0 anonpl 16 29999 0 23063 35 2 33 33 0 125 0 amapchunkpl 152 846 0 763 5 0 5 5 0 158 0 amappl16 192 539 0 124 22 0 22 22 0 8 0 amappl15 184 59 0 54 1 0 1 1 0 8 0 amappl14 176 23 0 20 2 1 1 1 0 8 0 amappl13 168 26 0 23 1 0 1 1 0 8 0 amappl12 160 26 0 22 1 0 1 1 0 8 0 amappl11 152 23 0 8 1 0 1 1 0 8 0 amappl10 144 74 0 69 1 0 1 1 0 8 0 amappl9 136 577 0 574 1 0 1 1 0 8 0 amappl8 128 128 0 116 1 0 1 1 0 8 0 amappl7 120 29 0 24 1 0 1 1 0 8 0 amappl6 112 64 0 57 1 0 1 1 0 8 0 amappl5 104 126 0 112 1 0 1 1 0 8 0 amappl4 96 462 0 434 2 1 1 2 0 8 0 amappl3 88 113 0 108 1 0 1 1 0 8 0 amappl2 80 849 0 805 2 0 2 2 0 8 0 amappl1 72 14609 0 14186 25 8 17 20 0 8 7 amappl 72 521 0 489 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 233 0 218 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 233 0 218 1 0 1 1 0 8 0 vmmpekpl 168 5954 0 5932 2 0 2 2 0 8 0 vmmpepl 168 32605 0 31300 90 10 80 80 0 357 18 vmsppl 360 232 0 218 2 0 2 2 0 8 0 pdppl 4096 474 0 436 6 0 6 6 0 8 0 pvpl 32 119490 0 109433 108 5 103 104 0 265 10 pmappl 224 232 0 218 2 0 2 2 0 8 1 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 430 0 4 13 0 13 13 0 8 0