Stuck CLOSED sockets / sshd / zombies...
Karl Pielorz
kpielorz_lst at tdx.co.uk
Tue Apr 8 09:04:27 UTC 2014
--On 07 April 2014 11:48 -0400 John Baldwin <jhb at freebsd.org> wrote:
> Ok, do you have a matching /usr/src on the boxes in question? If so,
> please do this:
>
> cd /usr/src/lib/libc
> make DEBUG_FLAGS=-g all install
That just installs stuff, not rebuild it right? (Looks to have installed
non-stripped versions?).
> Then re-run the scan to get a stuck sshd. Once that happens, please
> attach to the top-most stock sshd (the one in "urdlck") with gdb
> (gdb /usr/sbin/sshd <pid>) and run 'bt' and reply with the output.
Ok, that gives:
"
(gdb) bt
#0 0x00000008038ea89c in _umtx_op_err () from /lib/libthr.so.3
#1 0x00000008038e104f in __thr_rwlock_rdlock () from /lib/libthr.so.3
#2 0x00000008038e821c in _thr_rtld_init () from /lib/libthr.so.3
#3 0x000000080064f9a2 in _rtld_get_stack_prot () from /libexec/ld-elf.so.1
#4 0x00000008006498c9 in r_debug_state () from /libexec/ld-elf.so.1
#5 0x00000008006470cd in .text () from /libexec/ld-elf.so.1
#6 0x0000000000000246 in ?? ()
#7 0x0000000000000000 in ?? ()
"
-Karl
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