login: panic: malloc: out of space in kmem_map Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *391423 62499 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,ffff800020c26fb0,3,ffff800020b95c30) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1b1300,80084b01,ffff800020c26fb0,3,ffff800020b95c30) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd8076db3748,80084b01,ffff800020c26fb0,3,fffffd807f7c7b40,ffff800020b95c30) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8066e26b68,80084b01,ffff800020c26fb0,ffff800020b95c30) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b95c30,ffff800020c270f0,ffff800020c270e0) at sys_ioctl+0x646 syscall(ffff800020c27190) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c27190) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7fffff8678,36,3,b4720c7b890) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff8190, 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+24 panic() at panic+372 malloc(200000,2a,9) at malloc+2773 kcovioctl(1b1300,80084b01,ffff800020c26fb0,3,ffff800020b95c30) at kcovioctl+230 VOP_IOCTL(fffffd8076db3748,80084b01,ffff800020c26fb0,3,fffffd807f7c7b40,ffff800020b95c30) at VOP_IOCTL+154 vn_ioctl(fffffd8066e26b68,80084b01,ffff800020c26fb0,ffff800020b95c30) at vn_ioctl+201 sys_ioctl(ffff800020b95c30,ffff800020c270f0,ffff800020c270e0) at sys_ioctl+1606 syscall(ffff800020c27190) at syscall+1452 Xsyscall(6,36,7f7fffff8678,36,3,b4720c7b890) at Xsyscall+296 end of kernel end trace frame: 0x7f7fffff8190, count: -9 ddb{1}> show registers rdi 0 rsi 1 rbp 18446603336770808800 rbx 18446603336770808976 rdx 18446744071594911863 apollo_pio_rec+38602 rcx 0 rax 0 r8 18446744071588685763 kprintf+387 r9 1 r10 37 r11 5324752487082015965 r12 206158430216 r13 18446603336770808816 r14 256 r15 1 rip 18446744071586731208 db_enter+24 cs 8 rflags 582 rsp 18446603336770808784 ss 16 db_enter+24: addq $8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=391423 stat=onproc flags process=2 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020b24008,0xffffffff823234d8 process=0xffff800020b44358 user=0xffff800020c22000, vmspace=0xfffffd807f00dca8 estcpu=0, cpticks=3, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *62499 391423 88372 0 7 0x2 syz-executor.1 86679 286362 88372 0 3 0x82 piperd syz-executor.0 88372 179810 40811 0 3 0x82 thrsleep syz-fuzzer 88372 207072 40811 0 3 0x4000082 thrsleep syz-fuzzer 88372 469828 40811 0 3 0x4000082 thrsleep syz-fuzzer 88372 472294 40811 0 3 0x4000082 thrsleep syz-fuzzer 88372 133466 40811 0 3 0x4000082 thrsleep syz-fuzzer 88372 75209 40811 0 3 0x4000082 kqread syz-fuzzer 88372 211834 40811 0 3 0x4000082 thrsleep syz-fuzzer 88372 45706 40811 0 3 0x4000082 thrsleep syz-fuzzer 88372 390862 40811 0 3 0x4000082 thrsleep syz-fuzzer 88372 443000 40811 0 3 0x4000082 thrsleep syz-fuzzer 88372 255196 40811 0 3 0x4000082 thrsleep syz-fuzzer 40811 446956 82951 0 3 0x10008a pause ksh 82951 333384 71519 0 3 0x92 select sshd 17373 488024 1 0 3 0x100083 ttyin getty 71519 152836 1 0 3 0x80 select sshd 16892 76963 6557 73 3 0x100090 kqread syslogd 6557 219954 1 0 3 0x100082 netio syslogd 56324 348679 1 77 3 0x100090 poll dhclient 63079 119886 1 0 3 0x80 poll dhclient 51784 393869 0 0 3 0x14200 pgzero zerothread 23835 453889 0 0 3 0x14200 aiodoned aiodoned 62601 5912 0 0 3 0x14200 syncer update 51208 223405 0 0 3 0x14200 cleaner cleaner 25354 197275 0 0 3 0x14200 reaper reaper 14369 519208 0 0 3 0x14200 pgdaemon pagedaemon 21260 129173 0 0 3 0x14200 bored crynlk 45077 380659 0 0 3 0x14200 bored crypto 4733 210741 0 0 3 0x40014200 acpi0 acpi0 61601 335543 0 0 3 0x40014200 idle1 95578 420927 0 0 3 0x14200 bored softnet 98911 308179 0 0 3 0x14200 bored systqmp 40387 238814 0 0 3 0x14200 bored systq 57476 241221 0 0 3 0x40014200 bored softclock 64902 131682 0 0 7 0x40014200 idle0 1 485525 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 62499 (syz-executor.1) thread 0xffff800020b95c30 (391423) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82352b70) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+1418 #1 syscall+1151 #2 Xsyscall+296 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9451 71858K 71866K 78643K 10550 0 0 pcb 23 9K 9K 78643K 61 0 0 rtable 79 2K 3K 78643K 173 0 0 ifaddr 28 8K 9K 78643K 34 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 15 0 0 iov 0 0K 8K 78643K 6 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1198 75K 75K 78643K 1230 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 11 0K 0K 78643K 11 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 4 9K 25K 78643K 55 0 0 sigio 0 0K 0K 78643K 3 0 0 proc 41 38K 70K 78643K 248 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 ip_moptions 0 0K 0K 78643K 6 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 167 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 884 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 NDP 4 0K 0K 78643K 9 0 0 temp 69 2352K 2417K 78643K 2875 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 44 0 37 1 0 1 1 0 8 0 plimitpl 152 17 0 10 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 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 14 0 10 1 0 1 1 0 8 0 nd6 48 4 0 2 1 0 1 1 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 1 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 6 0 2 1 0 1 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1483 0 78 46 0 46 46 0 8 0 ffsino 272 1483 0 78 94 0 94 94 0 8 0 nchpl 144 1760 0 155 61 0 61 61 0 8 0 uvmvnodes 72 1538 0 0 28 0 28 28 0 8 0 vnodes 200 1538 0 0 81 0 81 81 0 8 0 namei 1024 4204 0 4204 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4186 0 4186 7 3 4 6 0 8 4 sigapl 432 220 0 208 2 0 2 2 0 8 0 futexpl 56 339 0 339 1 0 1 1 0 8 1 knotepl 112 80 0 51 2 0 2 2 0 8 1 kqueuepl 104 4 0 2 1 0 1 1 0 8 0 pipepl 112 158 0 139 2 1 1 1 0 8 0 fdescpl 488 221 0 208 3 0 3 3 0 8 1 filepl 152 1100 0 1012 6 1 5 5 0 8 1 lockfpl 104 15 0 15 2 1 1 1 0 8 1 lockfspl 32 29 0 29 2 1 1 1 0 8 1 sessionpl 112 17 0 8 1 0 1 1 0 8 0 pgrppl 48 17 0 8 1 0 1 1 0 8 0 ucredpl 96 80 0 73 1 0 1 1 0 8 0 zombiepl 144 208 0 208 2 1 1 1 0 8 1 processpl 840 235 0 208 4 0 4 4 0 8 0 procpl 600 318 0 281 4 0 4 4 0 8 1 srpgc 64 6 0 6 1 0 1 1 0 8 1 sockpl 384 88 0 71 3 0 3 3 0 8 1 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 107 0 0 13 0 13 13 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 159 0 0 10 0 10 10 0 8 0 bufpl 256 5240 0 1013 265 0 265 265 0 8 0 anonpl 16 27836 0 21900 30 1 29 29 0 125 0 amapchunkpl 152 909 0 823 6 0 6 6 0 158 2 amappl16 192 603 0 245 19 0 19 19 0 8 0 amappl15 184 18 0 16 1 0 1 1 0 8 0 amappl14 176 30 0 25 2 1 1 1 0 8 0 amappl13 168 24 0 21 1 0 1 1 0 8 0 amappl12 160 8 0 7 2 1 1 1 0 8 0 amappl11 152 177 0 168 1 0 1 1 0 8 0 amappl10 144 57 0 56 2 1 1 1 0 8 0 amappl9 136 352 0 348 1 0 1 1 0 8 0 amappl8 128 139 0 121 1 0 1 1 0 8 0 amappl7 120 40 0 33 1 0 1 1 0 8 0 amappl6 112 52 0 46 1 0 1 1 0 8 0 amappl5 104 144 0 132 1 0 1 1 0 8 0 amappl4 96 283 0 261 2 1 1 2 0 8 0 amappl3 88 125 0 120 1 0 1 1 0 8 0 amappl2 80 960 0 921 2 0 2 2 0 8 1 amappl1 72 12906 0 12518 23 9 14 19 0 8 4 amappl 72 523 0 492 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 24 221 0 208 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 221 0 208 1 0 1 1 0 8 0 vmmpekpl 168 5562 0 5540 2 0 2 2 0 8 0 vmmpepl 168 30454 0 29278 81 12 69 70 0 357 14 vmsppl 360 220 0 208 2 0 2 2 0 8 0 pdppl 4096 449 0 416 6 0 6 6 0 8 1 pvpl 32 109735 0 100958 98 6 92 96 0 265 9 pmappl 224 220 0 208 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 410 0 2 12 0 12 12 0 8 0