Messages in this thread | | | Date | Mon, 26 Nov 2001 00:46:31 -0500 | From | FORT David <> | Subject | Re: threads & /proc |
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Peter Zaitsev wrote:
>Hello Anton, > >Saturday, November 24, 2001, 8:38:57 AM, you wrote: > > >I would confirm the problem exists from the first 2.4.x kernels. Also >programs "w","vmstat","snmpd" hangs. It seems to happen both for >UP/SMP kernels. I have seen this only on High Memory (1-2G), therefore >I do not have much low memory machines loaded. The workload seems to >be the thing to affect this - I do not remember any hang on low VM >load system (for example Web Server) therefore it's offen happens >then there are a lot of I/O and swapping goes (i.e Mysql Server). >Often this happens after appearing some of new __order allocation >failed errors. > > > > >Other issue which looks like connected to this - a thread hangs in >"D" state forever and it's unable to be killed in this case even >reboot -f does not work. > >AP> Hi Guys, > >AP> Well, I'm a bit surprised that nobody asked it yet. Do we have sound >AP> thread support? I am able to put my linux-2.4.15-pre{1,7} -- >AP> definitely, and if I remember right, 2.4.14-pre{7,8} too in some strange >AP> state, when any program like top, killall or ps that wanna get some >AP> information from /proc (even midnight commander if you are trying to >AP> look at state of any process) blocks indefinitely. It goes to unclean >AP> shutdown, for example. kill doesn block, but do nothing. (I tried to >AP> kill processes from ls /proc list). And I see it only after several >AP> [unsuccessful] runs of my multithreaded program. Well, I can't say >AP> it's a correctly written program, I am still looking for bugs there. >AP> I don't have 100% way to get into this state, but I suspect some locking >AP> issues with /proc. > > > I've also seen the case on a UP, ps was locking. And i had launched a lot of multi-threaded processes(but i don't know if it's related). I can had that i had also launched a lot of gdb on the multi-threaded program. The program i was debugging is forking a process in a thread that dies after the fork.
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