On 11/9/2011 20:32, Dave Hart wrote:
On Thu, Nov 10, 2011 at 04:21, A C<agcarver+...@acarver.net> wrote:
As expected, it crashed again. The interesting thing is that the constant
output from -D2 stopped in its tracks. Nothing in the output shows anything
out of the ordinary. It just halts completely.
That's progress, and tells me a lot. We need to see where ntpd is
stuck, I think that means either attaching gdb to the hung ntpd, or
starting it again under gdb and breaking into gdb once it hangs. I'm
relatively weak on gdb, but I believe if it's started under gdb, ^C
will break into a gdb> prompt.
Once in, use "bt" to get a stack trace that hopefully goes back to
ntpdmain (that is, is hopefully on the correct ntpd thread, and not
any secondary or gdb-created thread).
First attempt with gdb and a back trace after attaching gdb to the hung
process (note this particular running of ntpd was not using the debug
command line options):
#0 0x103d1458 in .umul () from /usr/lib/libc.so.12
#1 0x103c38d4 in __pow5mult_D2A () from /usr/lib/libc.so.12
#2 0x103c3ac4 in __muldi3 () from /usr/lib/libc.so.12
#3 0x103c34dc in __mult_D2A () from /usr/lib/libc.so.12
#4 0x103c3728 in __pow5mult_D2A () from /usr/lib/libc.so.12
#5 0x103b61d4 in __dtoa () from /usr/lib/libc.so.12
#6 0x103b315c in __vfprintf_unlocked () from /usr/lib/libc.so.12
#7 0x103230c4 in snprintf () from /usr/lib/libc.so.12
#8 0x00023afc in ctl_putarray (tag=<value optimized out>, arr=0xa8fe0, start=1)
at ntp_control.c:1307
#9 0x00024a7c in ctl_putpeer (varid=30, peer=0xa8e70) at ntp_control.c:1777
#10 0x0002744c in read_variables (rbufp=0x1050d000, restrict_mask=0) at
ntp_control.c:2334
#11 0x0002664c in process_control (rbufp=0x1050d000, restrict_mask=0) at
ntp_control.c:809
#12 0x00035594 in receive (rbufp=0x1050d000) at ntp_proto.c:370
#13 0x00022c00 in ntpdmain (argc=<value optimized out>, argv=<value optimized
out>) at ntpd.c:1150
#14 0x0001381c in ___start ()
#15 0x00013754 in _start ()
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