login: panic: malloc: out of space in kmem_map Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *246050 56861 0 0x2 0 1K syz-executor.1 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(1b1300,80084b01,ffff800020c09590,3,ffff800020b28bd0) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1b1300,80084b01,ffff800020c09590,3,ffff800020b28bd0) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd80629011f8,80084b01,ffff800020c09590,3,fffffd807f7c69c0,ffff800020b28bd0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806717c610,80084b01,ffff800020c09590,ffff800020b28bd0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b28bd0,ffff800020c096d0,ffff800020c096c0) at sys_ioctl+0x651 syscall(ffff800020c09770) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c09770) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7fffff7228,36,3,55019459890) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff6d40, 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: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(1b1300,80084b01,ffff800020c09590,3,ffff800020b28bd0) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1b1300,80084b01,ffff800020c09590,3,ffff800020b28bd0) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd80629011f8,80084b01,ffff800020c09590,3,fffffd807f7c69c0,ffff800020b28bd0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806717c610,80084b01,ffff800020c09590,ffff800020b28bd0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b28bd0,ffff800020c096d0,ffff800020c096c0) at sys_ioctl+0x651 syscall(ffff800020c09770) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c09770) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7fffff7228,36,3,55019459890) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff6d40, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c091c0 rbx 0xffff800020c09270 rdx 0xffffffff81f8ad7c cy_pio_rec+0x366f rcx 0 rax 0 r8 0xffffffff819bd5f3 kprintf+0x183 r9 0x1 r10 0x25 r11 0x1e91acff95bb82b7 r12 0x3000000008 r13 0xffff800020c091d0 r14 0x100 r15 0x1 rip 0xffffffff81459958 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c091b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=246050 stat=onproc flags process=2 proc=0 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020b28720,0xffffffff823dac40 process=0xffff800020b7c6a8 user=0xffff800020c04000, vmspace=0xfffffd807effd2d0 estcpu=1, cpticks=3, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *56861 246050 84767 0 7 0x2 syz-executor.1 21959 167067 0 0 3 0x14200 bored sosplice 76364 59343 84767 0 3 0x82 piperd syz-executor.0 84767 395657 40277 0 3 0x82 thrsleep syz-fuzzer 84767 516130 40277 0 3 0x4000082 nanosleep syz-fuzzer 84767 151392 40277 0 3 0x4000082 thrsleep syz-fuzzer 84767 93183 40277 0 3 0x4000082 thrsleep syz-fuzzer 84767 305462 40277 0 3 0x4000082 kqread syz-fuzzer 84767 395410 40277 0 3 0x4000082 thrsleep syz-fuzzer 84767 99711 40277 0 3 0x4000082 thrsleep syz-fuzzer 84767 335595 40277 0 3 0x4000082 thrsleep syz-fuzzer 84767 473593 40277 0 3 0x4000082 thrsleep syz-fuzzer 84767 250164 40277 0 3 0x4000082 thrsleep syz-fuzzer 40277 2283 83214 0 3 0x10008a pause ksh 83214 69657 47438 0 3 0x92 select sshd 23329 18027 1 0 3 0x100083 ttyin getty 47438 175640 1 0 3 0x80 select sshd 13526 465164 40078 74 3 0x100092 bpf pflogd 40078 252794 1 0 3 0x80 netio pflogd 78729 2967 74128 73 3 0x100090 kqread syslogd 74128 380360 1 0 3 0x100082 netio syslogd 87442 475747 1 77 3 0x100090 poll dhclient 76400 328347 1 0 3 0x80 poll dhclient 66064 321802 0 0 3 0x14200 pgzero zerothread 52847 225686 0 0 3 0x14200 aiodoned aiodoned 9807 197574 0 0 3 0x14200 syncer update 28048 498359 0 0 3 0x14200 cleaner cleaner 89243 109144 0 0 3 0x14200 reaper reaper 81248 305606 0 0 3 0x14200 pgdaemon pagedaemon 90502 200287 0 0 3 0x14200 bored crynlk 65337 22381 0 0 3 0x14200 bored crypto 76471 485288 0 0 3 0x40014200 acpi0 acpi0 70535 265396 0 0 3 0x40014200 idle1 18841 469315 0 0 3 0x14200 bored softnet 90847 115386 0 0 3 0x14200 bored systqmp 35004 318972 0 0 3 0x14200 bored systq 60761 265837 0 0 3 0x40014200 bored softclock 22778 49126 0 0 7 0x40014200 idle0 84104 519297 0 0 3 0x14200 bored smr 1 174259 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 56861 (syz-executor.1) thread 0xffff800020b28bd0 (246050) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823ca8c0) 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 9471 71944K 71952K 78643K 10582 0 0 pcb 25 9K 10K 78643K 97 0 0 rtable 82 3K 4K 78643K 196 0 0 ifaddr 37 10K 11K 78643K 49 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1469 0 0 iov 0 0K 12K 78643K 14 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1201 75K 75K 78643K 1253 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 12 0K 1K 78643K 16 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 4 9K 25K 78643K 89 0 0 sigio 0 0K 0K 78643K 4 0 0 proc 53 50K 71K 78643K 327 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 48 212K 212K 78643K 48 0 0 exec 0 0K 1K 78643K 192 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 78 12K 21K 78643K 1104 0 0 UVM aobj 2 2K 2K 78643K 2 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 6 0 0 NDP 6 0K 0K 78643K 12 0 0 temp 82 2364K 2428K 78643K 3264 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 75 0 68 1 0 1 1 0 8 0 plimitpl 152 19 0 11 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 18 0 18 1 1 0 1 0 8 0 tcpcb 544 16 0 12 1 0 1 1 0 8 0 nd6 48 4 0 2 1 0 1 1 0 8 0 ppxss 1128 1 0 1 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 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 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 14 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1563 0 145 46 0 46 46 0 8 0 ffsino 272 1563 0 145 95 0 95 95 0 8 0 nchpl 144 1899 0 269 61 0 61 61 0 8 0 uvmvnodes 72 1621 0 0 30 0 30 30 0 8 0 vnodes 200 1621 0 0 86 0 86 86 0 8 0 namei 1024 4923 0 4923 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4648 0 4648 7 5 2 6 0 8 2 sigapl 432 282 0 268 3 1 2 3 0 8 0 futexpl 56 847 0 847 1 0 1 1 0 8 1 knotepl 112 91 0 62 2 1 1 2 0 8 0 kqueuepl 104 20 0 18 1 0 1 1 0 8 0 pipepl 112 192 0 173 2 1 1 1 0 8 0 fdescpl 488 283 0 268 5 2 3 3 0 8 1 filepl 152 1526 0 1433 6 1 5 5 0 8 1 lockfpl 104 29 0 29 2 1 1 1 0 8 1 lockfspl 32 35 0 35 2 1 1 1 0 8 1 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 96 185 0 176 1 0 1 1 0 8 0 zombiepl 144 268 0 268 3 2 1 1 0 8 1 processpl 840 299 0 268 4 0 4 4 0 8 0 procpl 600 463 0 423 4 0 4 4 0 8 0 srpgc 64 6 0 6 1 0 1 1 0 8 1 sosppl 128 3 0 3 1 0 1 1 0 8 1 sockpl 384 145 0 126 4 1 3 3 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 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 256 143 0 0 8 0 8 8 0 8 0 bufpl 256 5518 0 1043 280 0 280 280 0 8 0 anonpl 16 34121 0 27210 37 2 35 35 0 125 2 amapchunkpl 152 1172 0 1087 6 2 4 5 0 158 0 amappl16 192 818 0 412 23 0 23 23 0 8 2 amappl15 184 38 0 36 1 0 1 1 0 8 0 amappl14 176 31 0 25 1 0 1 1 0 8 0 amappl13 168 91 0 87 1 0 1 1 0 8 0 amappl12 160 6 0 6 1 1 0 1 0 8 0 amappl11 152 250 0 237 1 0 1 1 0 8 0 amappl10 144 66 0 62 1 0 1 1 0 8 0 amappl9 136 404 0 399 1 0 1 1 0 8 0 amappl8 128 136 0 122 1 0 1 1 0 8 0 amappl7 120 62 0 55 1 0 1 1 0 8 0 amappl6 112 59 0 50 1 0 1 1 0 8 0 amappl5 104 119 0 105 1 0 1 1 0 8 0 amappl4 96 312 0 290 2 1 1 2 0 8 0 amappl3 88 123 0 117 1 0 1 1 0 8 0 amappl2 80 1401 0 1355 3 1 2 2 0 8 0 amappl1 72 15495 0 15069 25 15 10 19 0 8 0 amappl 72 695 0 663 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 283 0 268 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 283 0 268 1 0 1 1 0 8 0 vmmpekpl 168 6320 0 6297 2 0 2 2 0 8 0 vmmpepl 168 37617 0 36316 95 19 76 76 0 357 15 vmsppl 360 282 0 268 2 0 2 2 0 8 0 pdppl 4096 574 0 536 8 2 6 6 0 8 1 pvpl 32 131756 0 121782 110 9 101 101 0 265 8 pmappl 224 282 0 268 2 1 1 2 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 432 0 7 13 0 13 13 0 8 0