[Dovecot] stale imap processes with 1.0.rc6 on FreeBSD

[Timo Sirainen]

On Thu, 2006-08-10 at 23:44 -0500, Jeremy C. Reed wrote:
> > > There are many more "imap" processes without any network connection 
> > > though.
> > 
> > These are the important processes then. What do ktrace and gdb
> > backtraces show for them?
> 
> Okay, here is one that no longer has an network connection:
> 
> (gdb) bt full
> #0  0x2811d590 in ?? ()
> No symbol table info available.
> #1  0x80a9230 in ?? ()
> No symbol table info available.
> #2  0x80a8915 in ?? ()
> No symbol table info available.
> #3  0x806104d in _fini ()
> No symbol table info available.
> #4  0x8055ac9 in i_stream_create_file (fd=-1077937284, pool=0x0, 
>     max_buffer_size=3217030017, autoclose_fd=-1077937263) at 
> istream-file.c:236
..

Unfortunately this backtrace is completely corrupted..

> Nothing for ktrace though. With ktracing enabled, next time doing gdb did 
> add details (but maybe not related):
> 
>  99399 imap     PSIG  SIGINT caught handler=0x80a92ec mask=0x0 code=0x0
>  99399 imap     RET   kevent -1 errno 4 Interrupted system call
>  99399 imap     CALL  write(0x6,0xbfbff7a3,0x1)
>  99399 imap     GIO   fd 6 wrote 1 byte
>        "\^B"
>  99399 imap     RET   write 1
>  99399 imap     CALL  sigreturn(0xbfbff7c0)
>  99399 imap     RET   sigreturn JUSTRETURN
>  99399 imap     CALL  write(0x2,0x80cb1e0,0x2b)
>  99399 imap     GIO   fd 2 wrote 43 bytes
>        "\^AFkevent() failed: Interrupted system call
>        "

Hmm. This actually helps. It shows it's blocking in ioloop-notify-kqueue
and it really shouldn't be blocking there. See if the attached patch
helps.

I think I'll also do some other cleanups to kqueue code now that I
finally really looked at it..
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