Date: Tue, 14 Sep 2004 12:06:11 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Julian Elischer <julian@elischer.org> Cc: freebsd-threads@freebsd.org Subject: Re: Unkillable KSE threaded proc Message-ID: <16711.5875.358882.236642@grasshopper.cs.duke.edu> In-Reply-To: <4147100C.8000005@elischer.org> References: <16703.11479.679335.588170@grasshopper.cs.duke.edu> <16703.12410.319869.29996@grasshopper.cs.duke.edu> <413F55B8.50003@elischer.org> <16703.28031.454342.774229@grasshopper.cs.duke.edu> <413F8DBB.5040502@elischer.org> <16704.40876.708925.425911@grasshopper.cs.duke.edu> <4140AA2A.90605@elischer.org> <16704.45327.42494.922427@grasshopper.cs.duke.edu> <4140C04D.1060906@elischer.org> <16704.49447.290897.602540@grasshopper.cs.duke.edu> <4146AAC1.5020701@elischer.org> <16711.383.448500.578640@grasshopper.cs.duke.edu> <4147100C.8000005@elischer.org>
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FWIW, for the case where there is one lingering thread, calling thread_unsuspend_one() on it seems to get it to exit.. Maybe there is some sort of race while exiting which causes the wrong number of threads to be either suspended, or unsuspended. If too many are suspended, one is left lingering. If too few are suspended, the system deadlocks because a thread never gets off the cpu. Would it help at all to try with libthr and see what it does? Let me know what more I can do to help get this fixed.. Drew PS: By "one lingering thread", I mean the case I first complained about. Eg: 540 c164e700 e52e1000 1387 1 538 000c482 (threaded) mx_pingpong thread 0xc1fb8320 ksegrp 0xc15bb850 [SUSP] db> tr 540 sched_switch(c1fb8320,0,0,15fc9814,e30bebc7) at sched_switch+0xd8 mi_switch(1,0,e881fc44,c051e6dd,c1fb8320) at mi_switch+0x1c7 thread_single(1,c06eaae0,e881fc64,c164e700,c1fb8320) at thread_single+0x1d7 exit1(c1fb8320,9,0,e881fce4,c051877e) at exit1+0x115 expand_name(c1fb8320,9,100,0,0) at expand_name postsig(9,202,c06e5dd8,17f,8058f84) at postsig+0x204 ast(e881fd48) at ast+0x5e4 doreti_ast() at doreti_ast+0x17 db> call thread_unsuspend_one(0xc1fb8320) 0xc1562640 <Happiness>
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