https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238333
Bug ID: 238333
Summary: bhyve random crash in rfb.c on FreeBSD current (after
r346011)
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: olev...@olevole.ru
After -O0 flag removal (
https://svnweb.freebsd.org/base?view=revision&revision=r346011 ) bhyve process
begins to crash with an active VNC session.
Not all VNC clients can crash. It seems that it depends on the default settings
(some use the default compression by default, some do not), for example, it
does not cause problems when using vncviewer (without any arguments) from
tigervnc-viewer, but is well reproduced using KDE's KRDC: net/krdc ).
When you connect to VNC console via KRDC bhyve process crashed with SIGBUS:
pid 88831 (bhyve), jid 0, uid 0: exited on signal 10 (core dumped)
Backtrace:
Thread 29 "rfbout" received signal SIGBUS, Bus error.
[Switching to LWP 101756 of process 93578]
memcpy () at /usr/src/lib/libc/amd64/string/memmove.S:306
306 MEMMOVE erms=0 overlap=1 begin=MEMMOVE_BEGIN end=MEMMOVE_END
(gdb) bt
#0 memcpy () at /usr/src/lib/libc/amd64/string/memmove.S:306
#1 0x00000008002c85dc in flush_pending (strm=<optimized out>) at
/usr/src/sys/contrib/zlib/deflate.c:741
#2 deflate (strm=0x800bb1030, flush=2) at
/usr/src/sys/contrib/zlib/deflate.c:787
#3 0x000000000023f141 in rfb_send_rect (rc=<optimized out>, cfd=<optimized
out>, gc=<optimized out>, x=0, y=0, w=128, h=32) at
/usr/src/usr.sbin/bhyve/rfb.c:355
#4 rfb_send_screen (rc=<optimized out>, cfd=6, all=<optimized out>) at
/usr/src/usr.sbin/bhyve/rfb.c:600
#5 0x000000000023f5c7 in rfb_wr_thr (arg=0x800bb1000) at
/usr/src/usr.sbin/bhyve/rfb.c:730
#6 0x000000080064b726 in thread_start (curthread=0x800be1000) at
/usr/src/lib/libthr/thread/thr_create.c:291
#7 0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffdc9e3000
(gdb) p len
$1 = 9600016
print sizeof(strm)
$2 = 8
(gdb) print sizeof(s)
$3 = 8
There are no problems when bhyve is compiled without optimization (-O0), so we
do not see this problem in FreeBSD <= 12.0, but the problem occurs in
FreeBSD-current
--
You are receiving this mail because:
You are the assignee for the bug.
_______________________________________________
freebsd-bugs@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-bugs
To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
