Date: Tue, 08 Apr 2014 22:06:36 +0100 From: Karl Pielorz <kpielorz_lst@tdx.co.uk> To: John Baldwin <jhb@freebsd.org> Cc: Konstantin Belousov <kostikbel@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: Stuck CLOSED sockets / sshd / zombies... Message-ID: <92366925229B4C5B21B04D81@study64.tdx.co.uk> In-Reply-To: <201404081533.53990.jhb@freebsd.org> References: <3FE645E9723756F22EF901AE@Mail-PC.tdx.co.uk> <20140408164353.GB21331@kib.kiev.ua> <277FA3F7B4E7A98921F4D631@study64.tdx.co.uk> <201404081533.53990.jhb@freebsd.org>
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--On 8 April 2014 15:33:53 -0400 John Baldwin <jhb@freebsd.org> wrote:
> I think this patch only changes debug info, so I think you can just build
> and install and re-attach gdb without having to restart sshd. Also, this
> patch should only require you to build and install libexec/rtld-elf.
Ok, patched, re-attached and re-ran bt (output is below). I've got gdb from
ports building on that machine but I probably won't be able to do any more
with it tonight.
-Karl
---
[Switching to LWP 100218]
0x00000008038ea89c in __error () from /lib/libthr.so.3
(gdb) bt
#0 0x00000008038ea89c in __error () from /lib/libthr.so.3
#1 0x00000008038e104f in __thr_rwlock_rdlock (rwlock=0x803af9480,
flags=<value optimized out>, tsp=<value optimized out>)
at /usr/src/lib/libthr/thread/thr_umtx.c:277
#2 0x00000008038e821c in _thr_rtld_rlock_acquire (lock=0x803af9480) at
atomic.h:143
#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 0x000000000041072c in grace_alarm_handler (sig=-17504) at
/usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/sshd.c:378
#7 <signal handler called>
#8 0x00000008038ea89c in __error () from /lib/libthr.so.3
#9 0x00000008038e104f in __thr_rwlock_rdlock (rwlock=0x803af9480,
flags=<value optimized out>, tsp=<value optimized out>)
at /usr/src/lib/libthr/thread/thr_umtx.c:277
#10 0x00000008038e821c in _thr_rtld_rlock_acquire (lock=0x803af9480) at
atomic.h:143
#11 0x000000080064f9a2 in _rtld_get_stack_prot () from /libexec/ld-elf.so.1
#12 0x00000008006498c9 in r_debug_state () from /libexec/ld-elf.so.1
#13 0x00000008006470cd in .text () from /libexec/ld-elf.so.1
#14 0x000000000042f9dd in sshpam_sigchld_handler (sig=<value optimized
out>) at
/usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/auth-pam.c:152
#15 <signal handler called>
#16 0x0000000800653aea in _rtld_atfork_post () from /libexec/ld-elf.so.1
#17 0x000000080064a1eb in dlclose () from /libexec/ld-elf.so.1
#18 0x0000000800edd121 in openpam_clear_chains () from /usr/lib/libpam.so.5
#19 0x0000000800edd0bc in openpam_clear_chains () from /usr/lib/libpam.so.5
#20 0x0000000800edd0bc in openpam_clear_chains () from /usr/lib/libpam.so.5
#21 0x0000000800edd061 in openpam_clear_chains () from /usr/lib/libpam.so.5
#22 0x0000000800ed99e7 in pam_end () from /usr/lib/libpam.so.5
#23 0x000000000042e15d in sshpam_cleanup () at
/usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/auth-pam.c:614
#24 0x000000000041d58f in do_cleanup (authctxt=0x80401a600) at
/usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/session.c:2732
#25 0x000000000041064f in ssh_cleanup_exit (i=255) at
/usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/sshd.c:2545
#26 0x0000000000428f83 in mm_request_receive (sock=<value optimized out>,
m=<value optimized out>)
at
/usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/monitor_wrap.c:153
#27 0x0000000000427e26 in monitor_read (pmonitor=0x804022220,
ent=0x6465a0, pent=0x7fffffffd0c0)
at /usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/monitor.c:593
#28 0x0000000000427b49 in monitor_child_preauth (_authctxt=<value
optimized out>, pmonitor=0x804022220)
at /usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/monitor.c:387
#29 0x000000000040fd15 in main (ac=<value optimized out>, av=<value
optimized out>) at
/usr/src/secure/usr.sbin/sshd/../../../crypto/openssh/sshd.c:679
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