>Synopsis: panic: malloc: out of space in kmem_map
>Category: kernel amd64
>Environment:
System : OpenBSD 7.8
Details : OpenBSD 7.8 (GENERIC.MP) #1: Sat Nov 29 11:02:59 MST 2025
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
Architecture: OpenBSD.amd64
Machine : amd64
>Description:
The machine is running 7.8 + syspatches under VMware:
hw.model=Intel(R) Xeon(R) Gold 6338 CPU @ 2.00GHz
hw.vendor=VMware, Inc.
hw.product=VMware20,1
hw.physmem=4277600256
hw.ncpufound=2
hw.ncpuonline=2
and panics with a out of space in kmem_map message. Panic, trace and
ps shown below.
I wish I could show malloc, but the machine is in a remote location
and these are the only ddb commands I got before the operator decided
to reboot.
panic: malloc: out of space in kmem_map
Stopped at db_enter+0x14: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*327273 39043 0 0x14000 0x200 0 systq
db_enter() at db_enter+0x14
panic(ffffffff82573eac) at panic+0xd5
malloc(2a39,2,9) at malloc+0x823
vmt_nicinfo_task(ffff8000000f8800) at vmt_nicinfo_task+0xec
taskq_thread(ffffffff82a19e10) at taskq_thread+0x129
end trace frame: 0x0, count: -5
PID TID PPID UID S FLAGS WAIT COMMAND
34434 429242 1 0 3 0x100083 ttyin getty
45351 273621 1 0 3 0x100083 ttyin getty
15766 13242 1 0 3 0x100083 ttyin getty
22501 485732 1 0 3 0x100083 ttyin getty
21121 14373 1 0 3 0x100083 ttyin getty
80812 223396 1 0 3 0x100098 kqread cron
38632 393850 1 10000 3 0x80 kqread python3.12
50241 286369 1 10000 3 0x80 kqread python3.12
47425 216199 1 10000 3 0x80 kqread python3.12
15348 391586 1 10000 3 0x90 kqread python3.12
83699 242757 1 10000 3 0x90 kqread python3.12
85859 155143 1 10000 3 0x80 kqread python3.12
140 96058 1 10000 3 0x90 kqread python3.12
16478 159685 1 10000 3 0x90 kqread python3.12
83476 226912 1 10000 3 0x80 kqread python3.12
90068 368113 1 10000 3 0x90 kqread python3.12
48780 36449 1 76 3 0x1000090 kqread p0f3
41298 290255 1 760 3 0x90 kqread snmpd
47065 410042 45934 95 3 0x1100092 kqread smtpd
69131 288318 45934 103 3 0x1100092 kqread smtpd
16340 95197 45934 95 3 0x1100092 kqread smtpd
93858 467609 45934 95 3 0x100092 kqread smtpd
77301 381360 45934 95 3 0x1100092 kqread smtpd
21497 499144 45934 95 3 0x1100092 kqread smtpd
45934 163643 1 0 3 0x100080 kqread smtpd
16761 447799 1 0 3 0x88 kqread sshd
57214 310491 0 0 3 0x14200 acct acct
56721 278490 1 0 3 0x100080 kqread ntpd
57480 393701 1368 83 3 0x100092 kqread ntpd
1368 281100 1 83 3 0x1100092 kqread ntpd
24741 184818 1 53 3 0x1000090 kqread unbound
74565 391331 50900 74 3 0x1100092 bpf pflogd
50900 22496 1 0 3 0x80 sbwait pflogd
65059 173120 1614 73 3 0x1100090 kqread syslogd
1614 223274 1 0 3 0x100082 sbwait syslogd
12330 136338 0 0 3 0x14200 bored smr
60396 73572 0 0 3 0x14200 pgzero zerothread
46408 208812 0 0 3 0x14200 aiodoned aiodoned
44729 344674 0 0 3 0x14200 syncer update
61833 363291 0 0 3 0x14200 cleaner cleaner
52556 361252 0 0 3 0x14200 reaper reaper
64026 456140 0 0 3 0x14200 pgdaemon pagedaemon
75515 242523 0 0 3 0x14200 bored wsdisplay0
14784 395040 0 0 3 0x14200 usbtsk usbtask
78465 209741 0 0 3 0x14200 usbatsk usbatsk
70654 374635 0 0 3 0x40014200 acpi0 acpi0
48248 77950 0 0 7 0x40014200 idle1
21581 78258 0 0 3 0x14200 bored softnet1
42528 246111 0 0 3 0x14200 netlock softnet0
84149 341522 0 0 3 0x14200 bored systqmp
*39043 327273 0 0 7 0x14200 systq
50129 384305 0 0 3 0x14200 netlock softclockmp
86142 318003 0 0 3 0x40014200 tmoslp softclock
95618 290560 0 0 3 0x40014200 idle0
1 184077 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
>How-To-Repeat:
It seems to be related to VMWare when the machine is under
medium/heavy network traffic. Other baremetal machines with similar
daemons/traffic work just fine.
Any command (vmstat, systat, etc), while the machine is alive, that
could help?
Thanks,
--Kor
>Fix:
Unknown.
