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SubjectRe: java (and possibly other threaded apps) hanging in rt_sigsuspend
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>>>>> "Frank" == Frank de Lange <frank@unternet.org> writes:

Frank> I saw your remarks on the kernel mailing list
Frank> wrt. 'threaded processes get stuck in
Frank> rt_sigsuspend/fillonedir/exit_notify' dd. 20000911-12, and
Frank> thought you might be interested in the fact that something
Frank> quite like this also happens on 2.4.0-test11 with glibc-2.2
Frank> (release), BUT NOT ALWAYS...

Frank> I can reliably hang java (Blackdown port jdk1.3, FCS) using
Frank> the -Xmx parameter (which specifies a maximum heap size),
Frank> the weird thing is that it does NOT hang which this
Frank> parameter is either not specified OR specified but larger
Frank> than a certain value. When it hangs, it always is stuck in
Frank> a rt_sigsuspend call just after a clone() call. An example:

Frank> [frank@behemoth frank]$ java
Frank> (java starts and spits out some info, then exits as
Frank> it should)

Frank> [frank@behemoth frank]$ java -Xmx32m
Frank> (java ALWAYS gets stuck:

Frank> pipe([6, 7]) = 0
Frank> clone() = 14732
Frank> [pid 14679] write(7, "\0\0\0\0\5\0\0\0~\266\2@ $T@\0 T@\0 T@\300\265\2@\0\0\0"..., 148) = 148
Frank> [pid 14679] rt_sigprocmask(SIG_SETMASK, NULL, [RT_0], 8) = 0
Frank> [pid 14679] write(7, "`S\3@\0\0\0\0\20\321\377\277pD\37@\30&\5\10\0\0\0\200\0"..., 148) = 148
Frank> [pid 14679] rt_sigprocmask(SIG_SETMASK, NULL, [RT_0], 8) = 0
Frank> [pid 14679] rt_sigsuspend([]
Frank> )

Can you reproduce this without strace?

I only see this problem when I run with 'strace -f' and java wants to
exit (apart from that java works correctly). I don't see the dependency
on the heap size here.


Juergen

--
Juergen Kreileder, Blackdown Java-Linux Team
http://www.blackdown.org/java-linux.html
JVM'01: http://www.usenix.org/events/jvm01/
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