"sleeping without queue" ?

[Mikhail Teterin]

Kostik Belousov написав(ла):
> On Tue, Jul 22, 2008 at 03:26:29PM -0400, Mikhail Teterin wrote:
>> Kostik Belousov написав(ла):
>>> Did you switched to the process before doing backtrace (using the proc 
>>> <pid>
>>> command)?
>> Ok, thanks. Did not know about this one. Here:
>> ...
>> (kgdb) proc 79759
>> (kgdb) bt
>> #0  sched_switch (td=0xffffff01286dc000, newtd=0xffffff00010ce000, 
>> flags=2) at /var/src/sys/kern/sched_4bsd.c:928
>> #1  0x0000000000000000 in ?? ()
>> #2  0xffffffff802f1108 in mi_switch (flags=678281216, newtd=0x2) at 
>> /var/src/sys/kern/kern_synch.c:442
>> #3  0xffffffff80318513 in sleepq_check_timeout () at 
>> /var/src/sys/kern/subr_sleepqueue.c:519
>> #4  0xffffffff80318c85 in sleepq_timedwait (wchan=0xffffffff80688408) at 
>> /var/src/sys/kern/subr_sleepqueue.c:597
>> #5  0xffffffff802f16a2 in _sleep (ident=0xffffffff80688408, lock=0x0, 
>> priority=0, wmesg=0xffffffff804f3059 "vmo_de", timo=1) at 
>> /var/src/sys/kern/kern_synch.c:224
>> #6  0xffffffff8043036b in vm_object_deallocate 
>> (object=0xffffff0053024a90) at /var/src/sys/vm/vm_object.c:509
> From this frame, please, print the object (like p *object) and
> likewise, print the object that is at the head of the object->shadow_head
> list.
kgdb /usr/obj/var/src/sys/SILVER-SMP/kernel.debug /dev/mem
[GDB will not be able to debug user-mode threads: 
/usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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There is no member named pathname.
Reading symbols from /opt/modules/fuse.ko...done.
Loaded symbols for /opt/modules/fuse.ko
Reading symbols from /opt/modules/rtc.ko...done.
Loaded symbols for /opt/modules/rtc.ko
Reading symbols from /boot/kernel/snd_ich.ko...Reading symbols from 
/boot/kernel/snd_ich.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/snd_ich.ko
Reading symbols from /boot/kernel/msdosfs.ko...Reading symbols from 
/boot/kernel/msdosfs.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/msdosfs.ko
#0  0x0000000000000000 in ?? ()
(kgdb) frame 6
Error accessing memory address 0x0: Bad address.
(kgdb) pid 79759
Undefined command: "pid".  Try "help".
(kgdb) proc 79759
(kgdb) frame 6
#6  0xffffffff8043036b in vm_object_deallocate 
(object=0xffffff0053024a90) at /var/src/sys/vm/vm_object.c:509
509                                             pause("vmo_de", 1);
(kgdb) p *object
$1 = {mtx = {lock_object = {lo_name = 0xffffffff804f21c4 "vm object", 
lo_type = 0xffffffff804f3018 "standard object", lo_flags = 21168128, 
lo_witness_data = {
        lod_list = {stqe_next = 0x0}, lod_witness = 0x0}}, mtx_lock = 4, 
mtx_recurse = 0}, object_list = {tqe_next = 0xffffff0005018a90,
    tqe_prev = 0xffffff00539a6850}, shadow_head = {lh_first = 
0xffffff005d3afa90}, shadow_list = {le_next = 0x0, le_prev = 
0xffffff005d2cd048}, memq = {
    tqh_first = 0xffffff007eb9fa58, tqh_last = 0xffffff007f864820}, root 
= 0xffffff007ee14d38, size = 427, generation = 66, ref_count = 2, 
shadow_count = 1,
  type = 0 '\0', flags = 256, pg_color = 0, paging_in_progress = 0, 
resident_page_count = 44, backing_object = 0x0, backing_object_offset = 
0, pager_object_list = {
    tqe_next = 0x0, tqe_prev = 0x0}, cache = 0x0, handle = 0x0, un_pager 
= {vnp = {vnp_size = 576646}, devp = {devp_pglist = {tqh_first = 0x8cc86,
        tqh_last = 0x0}}, swp = {swp_bcount = 576646}}}
(kgdb) p (object->shadow_head)
$2 = {lh_first = 0xffffff005d3afa90}
(kgdb) p *object->shadow_head.lh_first
$3 = {mtx = {lock_object = {lo_name = 0xffffffff804f21c4 "vm object", 
lo_type = 0xffffffff804f3018 "standard object", lo_flags = 21168128, 
lo_witness_data = {
        lod_list = {stqe_next = 0x0}, lod_witness = 0x0}}, mtx_lock = 4, 
mtx_recurse = 0}, object_list = {tqe_next = 0xffffff0066c32340,
    tqe_prev = 0xffffff012f673ac0}, shadow_head = {lh_first = 0x0}, 
shadow_list = {le_next = 0x0, le_prev = 0xffffff0053024ad0}, memq = {
    tqh_first = 0xffffff007779f9a0, tqh_last = 0xffffff0077c04140}, root 
= 0xffffff0077c04130, size = 387, generation = 3, ref_count = 1, 
shadow_count = 0,
  type = 0 '\0', flags = 8452, pg_color = 0, paging_in_progress = 0, 
resident_page_count = 2, backing_object = 0xffffff0053024a90, 
backing_object_offset = 163840,
  pager_object_list = {tqe_next = 0x0, tqe_prev = 0x0}, cache = 0x0, 
handle = 0x0, un_pager = {vnp = {vnp_size = 365278}, devp = {devp_pglist = {
        tqh_first = 0x592de, tqh_last = 0x0}}, swp = {swp_bcount = 365278}}}


>
> Another question is what scheduler do you use ?
options         SCHED_4BSD              # 4BSD scheduler
options         PREEMPTION              # Enable kernel thread preemption

>>> Also, show the output of ps axl <pid>.
>>  UID   PID  PPID CPU PRI NI   VSZ   RSS MWCHAN STAT  TT       TIME COMMAND
>>    0 79759 79758   0  96  0     0    16 -      DE+   p6    0:00,00 
>> /bin/tcsh -fc 
>> /meow/ports/editors/openoffice.org-3/work/BEB300_m3/solver/300/unxfbsdx.pro/bin/ma
>
> It makes sense to show the whole ps axl output.
See http://aldan.algebra.com/~mi/tmp/ps-axl.txt -- I edited it for 
privacy a little bit, but process-states are intact.
The java-processes in the linuxf have remained unkillable for weeks now 
-- I even forgot about them. But those are linuxulator problems, whereas 
the tcsh is native...

Yours,

    -mi