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Posted to commits@harmony.apache.org by "Gregory Shimansky (JIRA)" <ji...@apache.org> on 2007/04/16 16:51:15 UTC
[jira] Commented: (HARMONY-3666) [drlvm] crash handler sometimes
deadlocks
[ https://issues.apache.org/jira/browse/HARMONY-3666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489133 ]
Gregory Shimansky commented on HARMONY-3666:
--------------------------------------------
It appears that the group of functions on in glibc Linux which manage memory such as malloc, free, realloc and probably some other are using the same global lock for C heap. When some thread is executing such function and it is holding this global lock other threads cannot use these functions. It looks like fork uses malloc (or other C heap management functions) inside of its implementation, so when some thread in VM crashes and it tries to execute fork, it may dead lock with another thread that executes malloc/free.
> [drlvm] crash handler sometimes deadlocks
> ------------------------------------------
>
> Key: HARMONY-3666
> URL: https://issues.apache.org/jira/browse/HARMONY-3666
> Project: Harmony
> Issue Type: Bug
> Components: DRLVM
> Environment: Linux@ia32
> Reporter: Alexey Varlamov
> Attachments: gdb_all_bt.2.txt, gdb_all_bt.txt
>
>
> Running AWT tests with release VM, ~ each 3rd run hangs during stack dump. Usually this happens if SIGSEGV happens early enough (up to 6-8 tests run), probably interfered with compilation. I did not seen hangs on debug build, probably because of different timings.
> Anyway, almost always VM just prints "SIGSEGV in VM code." and either hangs or aborts.
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