Date: Wed, 17 Nov 2004 18:36:10 -0800 (PST) From: Doug White <dwhite@gumbysoft.com> To: Sean McNeil <sean@mcneil.com> Cc: current@freebsd.org Subject: Re: Why won't slapd shutdown (kill -0)? Message-ID: <20041117183453.C29048@carver.gumbysoft.com> In-Reply-To: <1100725008.21333.2.camel@server.mcneil.com> References: <1100657472.74795.2.camel@server.mcneil.com> <1100725008.21333.2.camel@server.mcneil.com>
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On Wed, 17 Nov 2004, Sean McNeil wrote:
> On Wed, 2004-11-17 at 10:28 -0800, Doug White wrote:
> > On Tue, 16 Nov 2004, Sean McNeil wrote:
> >
> > > This has been happening for a long time with current and hasn't been
> > > resolved. When I start up slapd, I cannot stop it without kill -9 ing
> > > it. It would appear stuck in kse and probably has something to do with
> > > kill -0:
> >
> > Mind expanding on this? The backtrace looks normal for a pthread process.
> > kill -0 just tests signal delivery; the process is completely unaware that
> > the probe occured, though. The process may also be unkillable if its
> > stuck in some sort of I/O wait.
> >
> > Is the server busy when you signal it?
>
> Oh, OK. I didn't look at /usr/local/etc/rc.subr too closely. I have
> additional information, though....
>
> It appears that all the threads are destroyed yet it is still in the
> thread processing loop. The process is no longer active at all. I just
> had a similar problem happen with vlc where I closed it yet it is
> hanging in the same place as slapd with all the threads gone.
Interesting... what scheduler are you using?
>
> Here is the one from vlc:
>
> (gdb) bt full
> #0 _thr_sched_switch_unlocked (curthread=0x955000) at pthread_md.h:226
I can't find a reference to this in that file. Can you run ldd against
your vlc binary? I('m curious what thread library it thinks its running.
> psf = {psf_valid = 0, psf_flags = 0, psf_cancelflags = 29952806,
> psf_interrupted = 8, psf_timeout = 11279168, psf_signo = 0,
> psf_state = 11279168, psf_wait_data = {mutex = 0x8, cond = 0x8, lock =
> 0x8,
> sigwait = 0x8}, psf_wakeup_time = {tv_sec = 0, tv_nsec = 0},
> psf_sigset = {
> __bits = {29950366, 8, 9860096, 0}}, psf_sigmask = {__bits =
> {9752576, 1,
> 9860096, 0}}, psf_seqno = 29995347}
> curkse = (struct kse *) 0x952000
> resume_once = 0
> #1 0x0000000801c925e0 in _thr_sched_switch (curthread=0x955000)
> at /usr/src/lib/libpthread/thread/thr_kern.c:607
> No locals.
> #2 0x0000000801c85cb4 in _pthread_join (pthread=0x967400,
> thread_return=0x0)
> at /usr/src/lib/libpthread/thread/thr_join.c:133
> curthread = (struct pthread *) 0x955000
> tmp = (void *) 0x0
> crit = 0x0
> ret = 0
> #3 0x0000000000431749 in __vlc_thread_join (p_this=0xad4800,
> psz_file=0x6a283c "src/playlist/playlist.c", i_line=130)
> at src/misc/threads.c:716
> i_ret = 1
> #4 0x000000000040ee1a in playlist_Destroy (p_playlist=0xad4800)
> ---Type <return> to continue, or q <return> to quit---
> at src/playlist/playlist.c:130
> No locals.
> #5 0x000000000040c400 in VLC_CleanUp (i_object=0) at src/libvlc.c:831
> p_intf = (intf_thread_t *) 0xad4800
> p_playlist = (playlist_t *) 0xad4800
> p_vout = (vout_thread_t *) 0xad4800
> p_aout = (aout_instance_t *) 0xad4800
> p_announce = (announce_handler_t *) 0xad4800
> p_vlc = (vlc_t *) 0x94d400
> #6 0x0000000000407415 in main (i_argc=1, ppsz_argv=0x7fffffffe940)
> at src/vlc.c:108
> i_ret = 0
>
> and here is a full trace of slapd:
>
> (gdb) bt full
> #0 0x000000080142e914 in kse_release () at kse_release.S:2
> No locals.
> #1 0x0000000801428e49 in kse_wait (kse=0x62a000, td_wait=0x0,
> sigseqno=0)
> at /usr/src/lib/libpthread/thread/thr_kern.c:1843
> ts = {tv_sec = 7647232, tv_nsec = 7647232}
> ts_sleep = {tv_sec = 60, tv_nsec = 0}
> saved_flags = 0
> #2 0x0000000801427078 in kse_sched_multi (kmbx=0x62efa0)
> at /usr/src/lib/libpthread/thread/thr_kern.c:1039
> curkse = (struct kse *) 0x62a000
> curthread = (struct pthread *) 0x0
> td_wait = (struct pthread *) 0x62a068
> curframe = (struct pthread_sigframe *) 0x17f
> ret = 383
> #3 0x000000080142afbf in _amd64_enter_uts ()
> at /usr/src/lib/libpthread/arch/amd64/amd64/enter_uts.S:40
> No locals.
> #4 0x0000000000000000 in ?? ()
> No symbol table info available.
> #5 0x000000000062f000 in ?? ()
> No symbol table info available.
> #6 0x000000000062a000 in ?? ()
> No symbol table info available.
> ---Type <return> to continue, or q <return> to quit---
> #7 0x0000000000000000 in ?? ()
> No symbol table info available.
> #8 0x0000000000000000 in ?? ()
> No symbol table info available.
> #9 0x0000000000000000 in ?? ()
> No symbol table info available.
> #10 0x0000000000000000 in ?? ()
> No symbol table info available.
> #11 0x0000000000000000 in ?? ()
> No symbol table info available.
> #12 0x0000000000000001 in ?? ()
> No symbol table info available.
> #13 0x0000000801426dd0 in _thr_sched_switch_unlocked ()
> at /usr/src/lib/libpthread/thread/thr_kern.c:904
> free_kseq = {tqh_first = 0x0, tqh_last = 0x801534810}
> gc_ksegq = {tqh_first = 0x0, tqh_last = 0x801534840}
> next_uniqueid = 7
> active_kse_groupq = {tqh_first = 0x62f100, tqh_last = 0x748020}
> active_kse_count = 2
> free_threadq = {tqh_first = 0x0, tqh_last = 0x801534890}
> free_kse_count = 0
> active_kseq = {tqh_first = 0x62a000, tqh_last = 0x6c9220}
> free_kse_groupq = {tqh_first = 0x0, tqh_last = 0x801534820}
> ---Type <return> to continue, or q <return> to quit---
> kse_lock = {l_head = 0x6291c0, l_tail = 0x6291c0,
> l_type = LCK_ADAPTIVE, l_wait = 0x801426150 <_kse_lock_wait>,
> l_wakeup = 0x8014261e0 <_kse_lock_wakeup>}
> active_kseg_count = 2
> inited = 1
> free_thread_count = 0
> free_kseg_count = 0
> thr_hashtable = {{lh_first = 0x0} <repeats 44 times>, {
> lh_first = 0x6c3c00}, {lh_first = 0x0}, {lh_first = 0x0}, {
> lh_first = 0x0}, {lh_first = 0x0}, {lh_first = 0x1874400}, {
> lh_first = 0x0}, {lh_first = 0x0}, {lh_first = 0x0}, {lh_first =
> 0x0}, {
> lh_first = 0x74b000}, {lh_first = 0x0} <repeats 15 times>, {
> lh_first = 0x74b800}, {lh_first = 0x0}, {lh_first = 0x0}, {
> lh_first = 0x0}, {lh_first = 0x0}, {lh_first = 0x0}, {lh_first =
> 0x0}, {
> lh_first = 0x0}, {lh_first = 0x0}, {lh_first = 0x632000}, {
> lh_first = 0x0} <repeats 23 times>, {lh_first = 0x29ab400}, {
> lh_first = 0x0}, {lh_first = 0x0}, {lh_first = 0x0}, {lh_first =
> 0x0}, {
> lh_first = 0x0}, {lh_first = 0x2983c00}, {
> lh_first = 0x0} <repeats 17 times>}
> thread_lock = {l_head = 0x6291e0, l_tail = 0x6291e0,
> l_type = LCK_ADAPTIVE, l_wait = 0x801426150 <_kse_lock_wait>,
> l_wakeup = 0x8014261e0 <_kse_lock_wakeup>}
> _tcb_mutex = 0x628380
> Previous frame inner to this frame (corrupt stack?)
>
> which looks like total garbage. Looking at each thread I see that there
> is only a thread 1,2, and 3:
>
> (gdb) thread 1
> [Switching to thread 1 (Thread 6 (LWP 100177))]#0 0x000000080142e914 in
> kse_release () at kse_release.S:2
> 2 RSYSCALL(kse_release)
> (gdb) bt
> #0 0x000000080142e914 in kse_release () at kse_release.S:2
> #1 0x000000080141d926 in sig_daemon (arg=0x7fffffefef70)
> at /usr/src/lib/libpthread/thread/thr_sig.c:216
> #2 0x0000000801426db5 in kse_sched_single (kmbx=0x7fffffefef70)
> at /usr/src/lib/libpthread/thread/thr_kern.c:902
>
> (gdb) thread 2
> [Switching to thread 2 (Thread 7 (sleeping))]#0
> _thr_sched_switch_unlocked (
> curthread=0x632000) at pthread_md.h:226
> 226 if (ret == 0) {
> Current language: auto; currently c
> (gdb) bt
> #0 _thr_sched_switch_unlocked (curthread=0x632000) at pthread_md.h:226
> #1 0x00000008014265e0 in _thr_sched_switch (curthread=0x632000)
> at /usr/src/lib/libpthread/thread/thr_kern.c:607
> #2 0x0000000801419cb4 in _pthread_join (pthread=0x74b000,
> thread_return=0x0)
> at /usr/src/lib/libpthread/thread/thr_join.c:133
> #3 0x0000000800719d09 in ldap_pvt_thread_join (thread=0x800609070,
> thread_return=0x62a068) at thr_posix.c:165
>
> (gdb) thread 3
> [Switching to thread 3 (LWP 100148)]#0 0x000000080142e914 in
> kse_release ()
> at kse_release.S:2
> 2 RSYSCALL(kse_release)
> Current language: auto; currently asm
> (gdb) bt
> #0 0x000000080142e914 in kse_release () at kse_release.S:2
> #1 0x0000000801428e49 in kse_wait (kse=0x62a000, td_wait=0x0,
> sigseqno=0)
> at /usr/src/lib/libpthread/thread/thr_kern.c:1843
> #2 0x0000000801427078 in kse_sched_multi (kmbx=0x62efa0)
> at /usr/src/lib/libpthread/thread/thr_kern.c:1039
> #3 0x000000080142afbf in _amd64_enter_uts ()
> at /usr/src/lib/libpthread/arch/amd64/amd64/enter_uts.S:40
>
> > >
> > > (gdb) bt
> > > #0 0x000000080142e914 in kse_release () at kse_release.S:2
> > > #1 0x0000000801428e49 in kse_wait (kse=0x62a000, td_wait=0x0,
> > > sigseqno=0)
> > > at /usr/src/lib/libpthread/thread/thr_kern.c:1843
> > > #2 0x0000000801427078 in kse_sched_multi (kmbx=0x62efa0)
> > > at /usr/src/lib/libpthread/thread/thr_kern.c:1039
> > > #3 0x000000080142afbf in _amd64_enter_uts ()
> > > at /usr/src/lib/libpthread/arch/amd64/amd64/enter_uts.S:40
> > > #4 0x0000000000000000 in ?? ()
> > > #5 0x000000000062f000 in ?? ()
> > > #6 0x000000000062a000 in ?? ()
> > > #7 0x0000000000000000 in ?? ()
> > > #8 0x0000000000000000 in ?? ()
> > > #9 0x0000000000000000 in ?? ()
> > > #10 0x0000000000000000 in ?? ()
> > > #11 0x0000000000000000 in ?? ()
> > > #12 0x0000000000000001 in ?? ()
> > > #13 0x0000000801426dd0 in _thr_sched_switch_unlocked ()
> > > at /usr/src/lib/libpthread/thread/thr_kern.c:904
> > > Previous frame inner to this frame (corrupt stack?)
> > >
> > >
> >
>
--
Doug White | FreeBSD: The Power to Serve
dwhite@gumbysoft.com | www.FreeBSD.org
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