[ https://issues.apache.org/jira/browse/HARMONY-5683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gregory Shimansky reassigned HARMONY-5683:
------------------------------------------

    Assignee: Gregory Shimansky

> [drlvm][signals] Crash handler often can't print stack on Linux
> ---------------------------------------------------------------
>
>                 Key: HARMONY-5683
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5683
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Linux
>            Reporter: Ilya Berezhniuk
>            Assignee: Gregory Shimansky
>            Priority: Minor
>         Attachments: H-5683.patch
>
>
> I've found that crash handler often prints only the first frame in stack dump.
> Investigation showed that stack range fails in unwind heuristics.
> A cause was also found: when VM maps unmapped stack area, it maps it with another access flags (rw, default stack access is rwx).
> After that pthread_attr_getstack() returns only stack area mapped with default attributes (before calling mmap() from VM).
> When crash occurs with SP value out of this small stack area mapped by default, unwind heuristics fails to unwind frame.
> Suggested patch adds PROT_EXEC flag for mapping stack to match default flags.
> The patch also adds special processing for described situation with SP to crash handler; the area starting the page containing current SP is added to stack area obtained through pthread_attr_getstack().

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