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From "Ilya Berezhniuk (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5617) [drlvm] On Linux crash handler may crash itself when handling SOE condition
Date Mon, 05 May 2008 14:43:55 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594244#action_12594244
] 

Ilya Berezhniuk commented on HARMONY-5617:
------------------------------------------

Performance testing shows that the patch does not affect performance.

> [drlvm] On Linux crash handler may crash itself when handling SOE condition
> ---------------------------------------------------------------------------
>
>                 Key: HARMONY-5617
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5617
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>    Affects Versions: 5.0M6
>         Environment: Linux x86 and x86_64
>            Reporter: Gregory Shimansky
>            Assignee: Gregory Shimansky
>            Priority: Minor
>         Attachments: 0001-HARMONY-5617.patch, 0001-HARMONY-5617.patch, H-5617-workaround.patch,
ThreadCreation.gif, ThreadManager.html.patch
>
>
> When crash handler receives a SIGSEGV signal that is caused by a stack overflow, it tries
to transfer control out of signal handler (just like it does for other kind of signals). But
the problem is that it tries to write memory pointed to by SP register (ESP or RSP) of the
original crash context. When crash happened because of stack overflow, writing to that memory
may not be possible since it is protected by a guard page. In this case crash handler crashes
itself:
> Program terminated with signal 11, Segmentation fault.
> #0  0x00002aaaaac27bbf in port_set_longjump_regs (fn=0x2aaaaac2658e, regs=0x7fffbd422b90,
num=3)
>     at /home/gregory/work/64/trunk/working_vm/vm/port/src/thread/linux/thread_em64t.c:86
> 86          *sp = (void*)regs->rip;
> (gdb) bt
> #0  0x00002aaaaac27bbf in port_set_longjump_regs (fn=0x2aaaaac2658e, regs=0x7fffbd422b90,
num=3)
>     at /home/gregory/work/64/trunk/working_vm/vm/port/src/thread/linux/thread_em64t.c:86
> #1  0x00002aaaaac26579 in general_signal_handler (signum=11, info=0x7fffbd422d70,
>     context=0x7fffbd422c40)
>     at /home/gregory/work/64/trunk/working_vm/vm/port/src/signals/linux/signals_common.cpp:107
> #2  <signal handler called>
> #3  0x00002aaabf5254c8 in ?? ()
> The crash happens for me on Gentoo Linux installations both on x86 and x86_64. The easiest
way to reproduce it is to run StackTest from the smoke VM tests.

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