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From: Raxit on 4 Jul 2008 10:50
Hi,

before few times on solaris 10, one process started cosuming cpu
towards 100%.
I have taken pstack and gcore. And by viewing stacks of threads, its
suprised to me !

128 threads are active


------
ff140090 lwp_park (0, 0, 0)
ff12409c _flockget (ff16c3b8, c9610, 44274, ff117594, ff16c308,
c9610) + 94
ff118110 fprintf (c9640, a7ae8, f7afa558, 501b0, ff118460, ff168284)
+ 50
00059644 logstr

many different threads (approx 100) executing/stcuk in above.

And below two threads, one in fopen and one in write, its get locked.

----
ff140090 lwp_park (0, 0, 0)
ff12409c _flockget (ff16c3b8, c9610, 44274, ff12bb8c, ff16c308,
c9610) + 94
ff121478 _endopen (c98b0, a7b00, c9640, 0, 109, 0) + 12c
ff124fac fopen (c98b0, a7b00, a7800, 3c788, 0, c9640) + 1c
000598c8 open_logfile (c98b0, c9800, c9c00, ff052400, ff16cbc0, 1) +
1e4
0003da30 sig_thr (0, feefc000, 0, 0, 3d98c, 0) + a4
ff13fff0 _lwp_start (0, 0, 0, 0, 0, 0)
-------
ff1218dc _flsbuf (32, c9640, ee, ff16c27c, fffffffb, ffffffff) + dc
ff1263d4 _fwrite_unlocked (4, 1, 23, c9640, 23, febfa55d) + 414
ff114478 _dowrite (febfa558, 23, c9640, febfa458, fe, 4) + 54
ff116f0c _ndoprnt (a7aea, febfa520, febfa57b, febfa558, febfa458,
ff150181) + 28bc
ff1181a0 fprintf (c9640, a7ae8, febfa558, 501b0, ff118460, ff168284)
+ e0
00059644 logstr (a3668, febfa8d0, 877b, dec88, ff322f58, d) + 1c4
....
.... some function calls here.
ff13fff0 _lwp_start (0, 0, 0, 0, 0, 0)
--------


I have tried much to debug, but no clue. [Only one doubt is i am
using alarm() to get one thread periodically do some stuff, and in
that above code is executed. Am i doing something stupid ? or any
hidden Os/library bug is kidding me ?

Tnx in advance,
-Raxit
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