panic: malloc: out of space in kmem_map Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *482226 45268 0 0x2 0 0K syz-executor.1 33589 80148 0 0x2 0x4000000 1 syz-fuzzer 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,ffff800020c519c0,3,ffff800020b29080) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1b1300,80084b01,ffff800020c519c0,3,ffff800020b29080) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd80621b5b58,80084b01,ffff800020c519c0,3,fffffd807f7c6480,ffff800020b29080) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807527c998,80084b01,ffff800020c519c0,ffff800020b29080) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b29080,ffff800020c51b00,ffff800020c51af0) at sys_ioctl+0x651 syscall(ffff800020c51ba0) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c51ba0) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7ffffd2ae8,36,3,5d3ebd06890) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd2600, 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: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,ffff800020c519c0,3,ffff800020b29080) at kcovioctl+0xe6 kd_init sys/dev/kcov.c:405 [inline] kcovioctl(1b1300,80084b01,ffff800020c519c0,3,ffff800020b29080) at kcovioctl+0xe6 sys/dev/kcov.c:298 VOP_IOCTL(fffffd80621b5b58,80084b01,ffff800020c519c0,3,fffffd807f7c6480,ffff800020b29080) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807527c998,80084b01,ffff800020c519c0,ffff800020b29080) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b29080,ffff800020c51b00,ffff800020c51af0) at sys_ioctl+0x651 syscall(ffff800020c51ba0) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c51ba0) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,36,7f7ffffd2ae8,36,3,5d3ebd06890) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd2600, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c515f0 rbx 0xffff800020c516a0 rdx 0xffffffff81f8b3e6 apollo_pio_rec+0x9d5d rcx 0 rax 0 r8 0xffffffff81b94ad3 kprintf+0x183 r9 0x1 r10 0x25 r11 0xa25d9f34486fce87 r12 0x3000000008 r13 0xffff800020c51600 r14 0x100 r15 0x1 rip 0xffffffff81d528d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c515e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=482226 stat=onproc flags process=2 proc=0 pri=67, usrpri=67, nice=20 forw=0xffffffffffffffff, list=0xffff800020b28bd0,0xffffffff82377160 process=0xffff800020b7c6a8 user=0xffff800020c4c000, vmspace=0xfffffd807effe708 estcpu=17, cpticks=2, pctcpu=0.1 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *45268 482226 80148 0 7 0x2 syz-executor.1 39680 24151 80148 0 2 0x2 syz-executor.0 80148 416699 73898 0 3 0x82 kqread syz-fuzzer 80148 131636 73898 0 3 0x4000082 nanosleep syz-fuzzer 80148 67044 73898 0 3 0x4000082 thrsleep syz-fuzzer 80148 491581 73898 0 3 0x4000082 thrsleep syz-fuzzer 80148 464530 73898 0 3 0x4000082 thrsleep syz-fuzzer 80148 277418 73898 0 3 0x4000082 thrsleep syz-fuzzer 80148 505690 73898 0 3 0x4000082 thrsleep syz-fuzzer 80148 363292 73898 0 3 0x4000082 thrsleep syz-fuzzer 80148 33589 73898 0 7 0x4000002 syz-fuzzer 80148 452077 73898 0 3 0x4000082 thrsleep syz-fuzzer 73898 217990 7170 0 3 0x10008a pause ksh 7170 472943 87985 0 3 0x92 select sshd 47107 441091 1 0 3 0x100083 ttyin getty 87985 278686 1 0 3 0x80 select sshd 29655 502311 48356 74 3 0x100092 bpf pflogd 48356 467274 1 0 3 0x80 netio pflogd 70858 196748 33939 73 3 0x100090 kqread syslogd 33939 220077 1 0 3 0x100082 netio syslogd 60743 216875 1 77 3 0x100090 poll dhclient 18042 391049 1 0 3 0x80 poll dhclient 95922 219696 0 0 3 0x14200 pgzero zerothread 9842 190278 0 0 3 0x14200 aiodoned aiodoned 88294 202973 0 0 3 0x14200 syncer update 70395 17865 0 0 3 0x14200 cleaner cleaner 89004 137217 0 0 3 0x14200 reaper reaper 47567 193931 0 0 3 0x14200 pgdaemon pagedaemon 6158 372697 0 0 3 0x14200 bored crynlk 1709 280493 0 0 3 0x14200 bored crypto 39894 462515 0 0 3 0x40014200 acpi0 acpi0 41699 417478 0 0 3 0x40014200 idle1 52901 301448 0 0 3 0x14200 bored softnet 36431 457465 0 0 3 0x14200 bored systqmp 99210 277234 0 0 3 0x14200 bored systq 39309 151106 0 0 3 0x40014200 bored softclock 9741 488605 0 0 3 0x40014200 idle0 47616 363421 0 0 3 0x14200 bored smr 1 17970 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 45268 (syz-executor.1) thread 0xffff800020b29080 (482226) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823e9b78) 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 9488 71938K 71962K 78643K 10700 0 0 pcb 25 9K 10K 78643K 194 0 0 rtable 82 3K 4K 78643K 347 0 0 ifaddr 43 11K 12K 78643K 91 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1475 0 0 iov 0 0K 16K 78643K 30 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1200 75K 76K 78643K 1428 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 59 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 4 9K 21K 78643K 299 0 0 sigio 0 0K 0K 78643K 2 0 0 proc 53 50K 71K 78643K 421 0 0 subproc 53 55297K 67586K 78643K 225 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 47 0 0 in_multi 22 1K 2K 78643K 83 0 0 ether_multi 1 0K 0K 78643K 2 0 0 mrt 0 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 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 246 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 22K 78643K 1832 0 0 UVM aobj 6 2K 2K 78643K 6 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 15 0 0 NDP 8 0K 0K 78643K 29 0 0 temp 110 2368K 2434K 78643K 4191 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 280 203 0 196 2 1 1 2 0 8 0 plimitpl 152 30 0 22 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 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 80 0 76 1 0 1 1 0 8 0 nd6 48 12 0 10 1 0 1 1 0 8 0 ppxss 1128 3 0 3 3 2 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 20 0 6 1 0 1 1 0 8 0 pfstkey 112 20 0 6 1 0 1 1 0 8 0 pfstate 328 20 0 5 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 256 352 0 208 12 0 12 12 0 8 2 art_table 32 353 0 208 2 0 2 2 0 8 0 art_node 16 76 0 48 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 3 1 0 1 1 0 8 0 semapl 112 57 0 47 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1930 0 504 47 0 47 47 0 8 0 ffsino 272 1930 0 504 96 0 96 96 0 8 0 nchpl 144 2572 0 940 62 0 62 62 0 8 0 uvmvnodes 72 2076 0 0 38 0 38 38 0 8 0 vnodes 200 2076 0 0 110 0 110 110 0 8 0 namei 1024 7315 0 7315 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 6832 0 6832 10 9 1 6 0 8 1 sigapl 432 483 0 469 2 0 2 2 0 8 0 futexpl 56 3722 0 3722 1 0 1 1 0 8 1 knotepl 112 199 0 178 1 0 1 1 0 8 0 kqueuepl 104 82 0 80 1 0 1 1 0 8 0 pipepl 112 362 0 343 3 2 1 2 0 8 0 fdescpl 488 484 0 469 3 0 3 3 0 8 0 filepl 152 2973 0 2880 5 0 5 5 0 8 1 lockfpl 104 96 0 96 2 1 1 1 0 8 1 lockfspl 32 81 0 81 2 1 1 1 0 8 1 sessionpl 112 22 0 12 1 0 1 1 0 8 0 pgrppl 48 26 0 16 1 0 1 1 0 8 0 ucredpl 96 514 0 505 1 0 1 1 0 8 0 zombiepl 144 469 0 469 2 1 1 1 0 8 1 processpl 840 499 0 469 4 0 4 4 0 8 0 procpl 600 1084 0 1045 4 0 4 4 0 8 0 srpgc 64 30 0 30 1 0 1 1 0 8 1 sockpl 384 366 0 347 3 0 3 3 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 129 0 0 16 0 16 16 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 154 0 0 9 0 9 9 0 8 0 bufpl 256 6398 0 1146 329 0 329 329 0 8 0 anonpl 16 56667 0 49707 49 2 47 47 0 125 11 amapchunkpl 152 2481 0 2393 5 0 5 5 0 158 0 amappl16 192 2046 0 1599 37 6 31 35 0 8 7 amappl15 184 74 0 70 1 0 1 1 0 8 0 amappl14 176 54 0 50 2 1 1 1 0 8 0 amappl13 168 35 0 32 1 0 1 1 0 8 0 amappl12 160 35 0 31 1 0 1 1 0 8 0 amappl11 152 40 0 25 1 0 1 1 0 8 0 amappl10 144 76 0 69 1 0 1 1 0 8 0 amappl9 136 753 0 750 1 0 1 1 0 8 0 amappl8 128 310 0 295 1 0 1 1 0 8 0 amappl7 120 44 0 38 1 0 1 1 0 8 0 amappl6 112 69 0 63 1 0 1 1 0 8 0 amappl5 104 142 0 127 1 0 1 1 0 8 0 amappl4 96 681 0 656 2 1 1 2 0 8 0 amappl3 88 149 0 144 1 0 1 1 0 8 0 amappl2 80 2987 0 2941 2 0 2 2 0 8 0 amappl1 72 20187 0 19767 25 15 10 20 0 8 0 amappl 72 1358 0 1325 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 484 0 469 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 484 0 469 1 0 1 1 0 8 0 vmmpekpl 168 8054 0 8030 2 0 2 2 0 8 0 vmmpepl 168 60417 0 59076 99 15 84 84 0 357 15 vmsppl 360 483 0 469 2 0 2 2 0 8 0 pdppl 4096 976 0 938 6 0 6 6 0 8 0 pvpl 32 196026 0 185908 134 9 125 125 0 265 26 pmappl 224 483 0 469 2 1 1 2 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 483 0 4 14 0 14 14 0 8 0