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Date:      Sun, 8 Jul 2012 12:56:01 -0500
From:      Alan Cox <alan.l.cox@gmail.com>
To:        =?ISO-8859-1?Q?Jean=2DS=E9bastien_P=E9dron?= <dumbbell@freebsd.org>
Cc:        freebsd-current@freebsd.org
Subject:   Re: panic after starting X with r238120
Message-ID:  <CAJUyCcNrWUe88CpSmb3Nx_zD8EWLecM%2BN3xQTEH-nH-ejPbkow@mail.gmail.com>
In-Reply-To: <4FF941EC.9050900@FreeBSD.org>
References:  <7F5E65B1-24AF-4942-A273-093EBAE94B7D@FreeBSD.org> <168031EF-1CBD-4B14-A99E-D5C90B01111C@FreeBSD.org> <CAJUyCcMO_244tK6kp73mGq1gFx-uFETmO9n-F7Qu2=ZoaYb9cQ@mail.gmail.com> <4FF62A6C.7090408@FreeBSD.org> <4FF8FB0C.4050706@mouf.net> <4FF941EC.9050900@FreeBSD.org>

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On Sun, Jul 8, 2012 at 3:16 AM, Jean-S=E9bastien P=E9dron
<dumbbell@freebsd.org>wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 08.07.2012 05:14, Steve Wills wrote:
> > For what it's worth, I discovered that twm and xterm don't trigger
> > the issue, but konsole and other kde things do, which is what led
> > me to discover that setting kern.ipc.shm_use_phys back to default
> > fixed it.
>
> I encountered the same issue with x11-wm/awesome, but everything's ok
> with twm. A kernel from 2012-06-23 doesn't crash but a kernel from
> 2012-07-03 does crash.
>
>

In r237513 on 6/23 I made a mistake that was corrected in r238124 on 7/5.
I can vaguely see a connection between kern.ipc.shm_use_phys and the
problem fixed in r238124.  So, I'd like to know if this problem still
exists.  Wait, however, until you see Kostik commit a change to
vm_pageout.c, before you update your system.


Here're the sysctls/tunables I have regarding shm:
>
> In /boot/loader.conf:
> kern.ipc.shmmni=3D"1024"
> kern.ipc.shmseg=3D"1024"
>
> In /etc/sysctl.conf:
> kern.ipc.shmmax=3D2147483648
> kern.ipc.shm_use_phys=3D1
> kern.ipc.shm_allow_removed=3D1
>
> - --
> Jean-S=E9bastien P=E9dron
>
> -----BEGIN PGP SIGNATURE-----
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> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
>
> iEYEARECAAYFAk/5QesACgkQa+xGJsFYOlPRwQCcClck3824nWltHoIVzuzmLBLz
> dyUAoIhVeREUZH26QdcJkyyXfna9LYQQ
> =3DmKU0
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