which limit is hit here?
Per olof Ljungmark
peo at nethead.se
Thu Feb 15 10:00:39 UTC 2018
On 02/15/18 10:56, Michael Schuster wrote:
>
>
> On Thu, Feb 15, 2018 at 10:54 AM, Per olof Ljungmark <peo at nethead.se
> <mailto:peo at nethead.se>> wrote:
>
> On 02/15/18 10:31, Michael Schuster wrote:
> >
> >
> > On Thu, Feb 15, 2018 at 10:27 AM, Per olof Ljungmark <peo at nethead.se <mailto:peo at nethead.se>
> > <mailto:peo at nethead.se <mailto:peo at nethead.se>>> wrote:
> >
> >
> >
> > On 02/15/18 10:07, Michael Schuster wrote:
> > > hmm ...
> > >
> > > what does gdb's "info shared" print out?
> >
> > "No shared libraries loaded at this time."
> >
> >
> > is that really all?
>
> Yes, that is what is says.
>
>
> in that case, someone with more intimate knowledge of (and access to)
> FreeBSD and/or Cyrus-IMAP will have to step in ... sorry :-)
Like the maintainer of the port ...?
Thank you anyway!
> > I'd expect something like this (library names removed by me) - this is
> > not on BSD, btw, but I'd expect gdb to behave in a similar fashion:
> >
> > (gdb) info shared
> > From To Syms Read Shared Object Library
> > 0x01120000 0x011b090c Yes xxxx
> > 0x78a3e000 0x78a64660 Yes (*) xxxxxx
> > 0x78317000 0x7831d290 Yes (*) xxxxxx.so
> > 0x78087000 0x78087000 No xxxxxxxxxxxx.so.1.1
> > 0x78056000 0x78056000 No xxxxxxxxxx.1.2
> > 0x7801f000 0x7801f000 No xxxxxxxxxxxxso.1.0
> > 0x7800c000 0x7800c000 No xxxxxxxxxx.so.1.0
> > 0x78000000 0x78000000 No xxxxxxxxxxxxxx.so.1.0
> > 0x78017000 0x78017000 No xxxxxxxxx.so.1.0
> > 0x78129000 0x7819f960 Yes xxxxxxso
> > 0x78037000 0x78040768 Yes xxxxxxxx.so
> > 0x78025000 0x7802f6e0 Yes xxxxxxxxso.2
> > 0x78047000 0x78054970 Yes xxxxxxxxxxx.so
> > (*): Shared library is missing debugging information.
> > (gdb)
> >
> >
> >
> >
> > >
> > > On Thu, Feb 15, 2018 at 10:06 AM, Per olof Ljungmark <peo at nethead.se <mailto:peo at nethead.se> <mailto:peo at nethead.se
> <mailto:peo at nethead.se>>
> > > <mailto:peo at nethead.se <mailto:peo at nethead.se>
> <mailto:peo at nethead.se <mailto:peo at nethead.se>>>> wrote:
> > >
> > > On 02/15/18 08:56, Michael Schuster wrote:
> > > > Hi Per,
> > > >
> > > > On Thu, Feb 15, 2018 at 8:41 AM, Per olof Ljungmark
> <peo at nethead.se <mailto:peo at nethead.se> <mailto:peo at nethead.se
> <mailto:peo at nethead.se>> <mailto:peo at nethead.se <mailto:peo at nethead.se>
> > <mailto:peo at nethead.se <mailto:peo at nethead.se>>>
> > > > <mailto:peo at nethead.se <mailto:peo at nethead.se>
> <mailto:peo at nethead.se <mailto:peo at nethead.se>>
> > <mailto:peo at nethead.se <mailto:peo at nethead.se>
> <mailto:peo at nethead.se <mailto:peo at nethead.se>>>>> wrote:
> > > >
> > > > Hi,
> > > >
> > > > A process "squatter" from Cyrus-IMAP version 2.5.11
> > exits with signal
> > > > 11. The purpose of the process is to create an
> index of
> > the content in a
> > > > mailbox.
> > > >
> > > > On large mailboxes, squatter coredumps, the final
> > message from truss
> > > > reads:
> > > >
> > > >
> >
> mmap(0x0,700448768,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,-1,0x0) =
> > > > 34783363072 (0x819400000)
> > > > mmap(0x0,936334732,PROT_READ,MAP_SHARED,107,0x0) =
> > 35483811840
> > > > (0x843000000)
> > > > SIGNAL 11 (SIGSEGV)
> > > > process killed, signal = 11 (core dumped)
> > > >
> > > >
> > > > to me this looks like the error is happening *after*
> mmap()
> > returned
> > > > successfully - most likely because "someone" miscalculates
> > some pointer
> > > > and tries to access an unmapped address. Maybe (but that's
> > conjecture),
> > > > PROT_READ is wrong here and someone is attempting to write
> > to that
> > > > mapped region; I'm not 100% sure though whether that'd
> > actually trigger
> > > > SIGSEGV.
> > > >
> > > > I'd suggest you do something like
> > > > $ gdb squatter core
> > > > (gdb) bt
> > > >
> > > > and look at the output, and maybe go to the maintainers of
> > Cyrus-IMAP...
> > >
> > > Hi,
> > >
> > > gdb says,
> > >
> > > (gdb) bt
> > > #0 0x00000000004049cc in ?? ()
> > > #1 0x0000000803456da4 in ?? ()
> > > #2 0x0000000804445130 in ?? ()
> > > #3 0x003875e5ffffcb00 in ?? ()
> > > #4 0x00000008047e7008 in ?? ()
> > > #5 0x00000008047e7048 in ?? ()
> > > #6 0x00000001040000c0 in ?? ()
> > > #7 0x0000000810800000 in ?? ()
> > > #8 0x0000000200000045 in ?? ()
> > > #9 0x000000083a400000 in ?? ()
> > > #10 0x00000008047e8e98 in ?? ()
> > > #11 0x00000000000003bb in ?? ()
> > > #12 0x00000008047e8eb8 in ?? ()
> > > #13 0x00000000000000bf in ?? ()
> > > #14 0x0ffd2a151071e550 in ?? ()
> > > #15 0x000000bf00000002 in ?? ()
> > > #16 0x37cf558c1298d1e7 in ?? ()
> > > #17 0x0135682800000000 in ?? ()
> > > #18 0x02e00a0e020d0336 in ?? ()
> > > #19 0x0487888c03b90d10 in ?? ()
> > > #20 0x062618da0556e126 in ?? ()
> > > #21 0x0000000006f31067 in ?? ()
> > > #22 0x0000000000000000 in ?? ()
> > >
> > >
> > >
> > >
> > > --
> > > Michael Schuster
> > > http://recursiveramblings.wordpress.com/
> <http://recursiveramblings.wordpress.com/>
> > <http://recursiveramblings.wordpress.com/
> <http://recursiveramblings.wordpress.com/>>
> > > recursion, n: see 'recursion'
> >
> > --
> > Per olof Ljungmark
> > +46 707 50 20 46 <tel:%2B46%20707%2050%2020%2046>
> <tel:%2B46%20707%2050%2020%2046>
> > Nethead AB
> > Registered in Stockholm, Sweden
> > SE556815226701
> >
> >
> >
> >
> > --
> > Michael Schuster
> > http://recursiveramblings.wordpress.com/
> <http://recursiveramblings.wordpress.com/>
> > recursion, n: see 'recursion'
>
> --
> Per olof Ljungmark
> +46 707 50 20 46 <tel:%2B46%20707%2050%2020%2046>
> Nethead AB
> Registered in Stockholm, Sweden
> SE556815226701
>
>
>
>
> --
> Michael Schuster
> http://recursiveramblings.wordpress.com/
> recursion, n: see 'recursion'
--
Per olof Ljungmark
+46 707 50 20 46
Nethead AB
Registered in Stockholm, Sweden
SE556815226701
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