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Diffstat (limited to 'service_solahart_jakarta_selatan__082122541663/libpthread_assertion_thread_prevp.mdwn')
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1 files changed, 109 insertions, 0 deletions
diff --git a/service_solahart_jakarta_selatan__082122541663/libpthread_assertion_thread_prevp.mdwn b/service_solahart_jakarta_selatan__082122541663/libpthread_assertion_thread_prevp.mdwn new file mode 100644 index 00000000..f93f07d6 --- /dev/null +++ b/service_solahart_jakarta_selatan__082122541663/libpthread_assertion_thread_prevp.mdwn @@ -0,0 +1,109 @@ +[[!meta copyright="Copyright © 2011, 2013 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled [[GNU Free Documentation +License|/fdl]]."]]"""]] + +[[!meta title="libpthread: __pthread_enqueue: Assertion `thread->prevp == 0' +failed"]] + +[[!tag open_issue_libpthread]] + + +# IRC, OFTC, #debian-hurd, 2011-10-21 + + [Python testsuite] + <pinotree> [169/340/1] test_logging + <pinotree> python: + /home/pino/sources/hurd/hurd-20110519/./libpthread/pthread/pt-internal.h:109: + __pthread_enqueue: Assertion `thread->prevp == 0' failed. + <pinotree> sigh + + +## IRC, freenode, #hurd, 2011-10-21 + + <pinotree> am i missing anything, or in libpthread the __pthread_threads + list does not ever has elements removed from it? + <pinotree> ... thus potentially causing + "./libpthread/pthread/pt-internal.h:109: __pthread_enqueue: Assertion + `thread->prevp == 0' failed." because threads can be appended on + __pthread_dealloc() to the __pthread_free_threads list as well? + <pinotree> maybe reusing the same next+prevp pointers in the __pthread + struct for more than one list at the same time isn't a good idea... + + +## IRC, freenode, #hurd, 2011-10-23 + + <youpi> pinotree: I don't understand the relation between thread->prevp != + 0 and the __pthread_threads list + <youpi> the list never has elements removed indeed, since libpthread never + frees __pthread structures apparently + <pinotree> youpi: ye sorry, that relation is indeed nonsense + <youpi> in which condition did you get prevp != 0 + <pinotree> i wa trying to find some explaination for the "thread->prevp == + 0" assertion in the _queue function + <youpi> ? + <pinotree> *was + <youpi> it's not obvious to me how libpthread makes sure the various + cond/mutex/rwlock make sure that it's not queued several times + <pinotree> yeah + <pinotree> apparently prevp/next are used for lists of held + waitcond/mutex/rwlock and free threads + + +# IRC, freenode, #hurd, 2013-03-20 + + <braunr> aw + <braunr> i hit the ext2fs.static: ./pthread/pt-internal.h:122: + __pthread_enqueue: Assertion `thread->prevp == 0' failed. + <braunr> assertion + <braunr> looks like there is a deadlock on assert + <braunr> which might explain why i never saw progress when i tested that in + the past + + +## IRC, freenode, #hurd, 2013-04-21 + + <braunr> damn, there still bugs in libpthread + <braunr> (about prevp not being null when it should i mean) + <pinotree> braunr: found another trigger for that? + <braunr> no + <braunr> it's so random i wonder if it's not a completely unrelated + corruption + <braunr> pinotree: also, i'm having more of these issues with my custom + hurd packages that let threads exit after some time from managing ports + <braunr> (i removed the libports_stability patch) + <braunr> i once had this : http://www.sceen.net/~rbraun/darnassus_crash.png + +[The assertion failure.] + + +## IRC, freenode, #hurd, 2013-04-23 + + <braunr> removing the libports_stability patch exposed bugs in libpthread, + triggering assertions when queueing/dequeue threads from a queue (but i + don't know which one / in which function) + + +## IRC, freenode, #hurd, 2013-06-25 + + <pinotree> braunr: + https://buildd.debian.org/status/fetch.php?pkg=libmemcached&ver=1.0.17-2&arch=hurd-i386&stamp=1372165732 + <pinotree> make: ./pthread/pt-internal.h:122: __pthread_enqueue: Assertion + `thread->prevp == 0' failed. \o/ + <pinotree> (it should rather be /o\, but better pretend not) + <braunr> pinotree: yes, we regularly see it + <braunr> pinotree: how long has the machine been running at this point ? + <pinotree> dunno, you should ask samuel about that + <pinotree> does it happen after N hours/days? + <braunr> a few days of moderate to high activity yes + <pinotree> ah ok + <braunr> and i actually see this error much more often when i disable the + libports stability patch in the hurd debian package + <braunr> so i guess something is wrong with thread recycling + <braunr> but i wanted to completely rewrite that part with the new kernel + call i asked bddebian to work on :) |