https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291616
Bug ID: 291616
Summary: bhyve: crashes with slirp open networking
Product: Base System
Version: CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bhyve
Assignee: [email protected]
Reporter: [email protected]
Steps to reproduce:
1. Run a guest. I use Ubuntu Linux for testing:
bhyve -c 2 -m 4096 -S -A -I -u -H -P -s 0:0,hostbridge -l
bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd -s 1:0,lpc -s
7:0,virtio-blk,/data/img/u
buntu2510.img -l com1,stdio -s 8:0,virtio-net,slirp,mac=94:06:31:1a:a6:f7,open
ubuntu2510
2. Generate traffic from the guest. I use the following command:
while wget
https://download.freebsd.org/releases/ISO-IMAGES/15.0/FreeBSD-15.0-RELEASE-arm64-aarch64-dvd1.iso
-O /dev/null; do : ; done
bhyve crashes with:
thr_kill () at thr_kill.S:4
4 RSYSCALL(thr_kill)
/dev/null
68%[===========================================================================================================>
] 2.63G --.-KB/s eta 3m
13s
(gdb) bt
#0 thr_kill () at thr_kill.S:4
#1 0x000000080114c934 in __raise (s=s@entry=6) at
/usr/home/novel/code/freebsd-src/lib/libc/gen/raise.c:48
#2 0x00000008011fe7a9 in abort () at
/usr/home/novel/code/freebsd-src/lib/libc/stdlib/abort.c:61
#3 0x000000080112f521 in __assert (func=<optimized out>, file=<optimized out>,
line=line@entry=113, failedexpr=<optimized out>) at
/usr/home/novel/code/freebsd-src/lib/libc/gen/assert.c:47
#4 0x0000000001024f2e in slirp_cb_send_packet (buf=<optimized out>, len=1514,
param=<optimized out>) at
/usr/home/novel/code/freebsd-src/usr.sbin/bhyve/slirp/slirp-helper.c:113
#5 0x000000080141ad02 in ?? () from /usr/local/lib/libslirp.so.0
#6 0x0000000801412f7d in ?? () from /usr/local/lib/libslirp.so.0
#7 0x0000000801416366 in ?? () from /usr/local/lib/libslirp.so.0
#8 0x0000000801421197 in ?? () from /usr/local/lib/libslirp.so.0
#9 0x000000080141a718 in slirp_pollfds_poll () from
/usr/local/lib/libslirp.so.0
#10 0x0000000001024c73 in slirp_pollfd_loop (priv=0x7fffffffe7b0) at
/usr/home/novel/code/freebsd-src/usr.sbin/bhyve/slirp/slirp-helper.c:263
#11 main (argc=<optimized out>, argv=<optimized out>) at
/usr/home/novel/code/freebsd-src/usr.sbin/bhyve/slirp/slirp-helper.c:566
(gdb) fr 4
#4 0x0000000001024f2e in slirp_cb_send_packet (buf=<optimized out>, len=1514,
param=<optimized out>) at
/usr/home/novel/code/freebsd-src/usr.sbin/bhyve/slirp/slirp-helper.c:113
113 assert((size_t)n == len);
(gdb) p n
$1 = 0
(gdb)
Host system is:
FreeBSD tulp 16.0-CURRENT FreeBSD 16.0-CURRENT #1 main-n282364-69e041521a80:
Fri Dec 5 16:24:19 CET 2025
novel@tulp:/usr/obj/usr/home/novel/code/freebsd-src/amd64.amd64/sys/TULP amd64
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