Issue #2811 has been updated by bycn82.
File dntpd.core added
File dntpd added
Reading symbols from /usr/src/usr.sbin/dntpd/dntpd...done.
(gdb) b vlogline
Breakpoint 1 at 0x402c77: file log.c, line 113.
(gdb) run
Starting program: /usr/src/usr.sbin/dntpd/dntpd
Breakpoint 1, vlogline (level=level@entry=0, newline=newline@entry=1,
ctl=ctl@entry=0x404d38 "%s: NOTE: killing old daemon and starting a new
one",
va=va@entry=0x7ffffffff678) at log.c:113
113 {
(gdb) list
108 }
109 }
110
111 static void
112 vlogline(int level, int newline, const char *ctl, va_list va)
113 {
114 static char line_build[1024];
115 static int line_index;
116 int priority;
117
(gdb) print va
$1 = (struct __va_list_tag *) 0x7ffffffff678
(gdb) print *va
$2 = {gp_offset = 8, fp_offset = 48, overflow_arg_area = 0x7ffffffff750,
reg_save_area = 0x7ffffffff690}
(gdb) n
121 if (level <= debug_level) {
(gdb) n
122 if (log_stderr) {
(gdb) n
123 vfprintf(stderr, ctl, va);
(gdb) n
/usr/src/usr.sbin/dntpd/dntpd: NOTE: killing old daemon and starting a new
one124 if (newline)
(gdb) n
125 fprintf(stderr, "\n");
(gdb) print va
$3 = (struct __va_list_tag *) 0x7ffffffff678
(gdb) print *va
$4 = {gp_offset = 16, fp_offset = 48, overflow_arg_area = 0x7ffffffff750,
reg_save_area = 0x7ffffffff690}
(gdb) n
126 fflush(stderr);
(gdb) n
128 if (debug_opt == 0) {
(gdb) n
129 vsnprintf(line_build + line_index, sizeof(line_build) -
line_index,
(gdb) print *va
$5 = {gp_offset = 16, fp_offset = 48, overflow_arg_area = 0x7ffffffff750,
reg_save_area = 0x7ffffffff690}
(gdb) n
Program received signal SIGSEGV, Segmentation fault.
0x0000000800b5214d in __vfprintf () from /lib/libc.so.8
(gdb)
the gp_offset changed after first va_arg, and
----------------------------------------
Bug #2811: va_arg twice in dntpd
http://bugs.dragonflybsd.org/issues/2811#change-12640
* Author: bycn82
* Status: Resolved
* Priority: Normal
* Assignee:
* Category:
* Target version:
----------------------------------------
the function vlogline of below file
/usr.sbin/dntpd/log.c
it is possible to print the va into stderr and log into syslog ,below is the
overview of the function.
function vlogline(){
if (log_stderr) {
print va into stderr
}
if(debug_opt == 0){
syslog
}
}
va_arg() will move the ap to next arg. somehow in my development environment,
it dumpped when i trigger it manually,
core file and patch in the attachment.
dev01#dntpd
dntpd: NOTE: killing old daemon and starting a new one
Segmentation fault (core dumped)
dev01#
---Files--------------------------------
dntpd.core (996 KB)
dntpd.patch (1.07 KB)
dntpd.core (996 KB)
dntpd (85.3 KB)
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