Date:	Sat, 14 Mar 2009 15:34:42 +0100
From:	Frans Pop <elendil@...net.nl>
To:	dri-devel@...ts.sourceforge.net
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	airlied@...ux.ie
Subject: DRM oops while starting second X.org session in chroot

I had the oops below today after I tried to start a second X.org session
in a chroot using 'startx -- :1'. I think the problem here is that the
driver was loaded, but that the corresponding device did not exist in
/dev in the chroot (forgot to bind mount it). If that is the cause,
it would be nice if it was handled more gracefully than this :-P

The oops also hung my primary X session. I could no longer switch consoles.
Sysrq did still work.

The first 3 messages are almost certainly from starting X in the main
X session, but I've left them in to show that that did work.

The "drm:i915_get_vblank_counter" is an extremely annoying message that
I get with 2.6.29 whenever I suspend the system or start a session for
a second user. Before 2.6.29 I only very rarely saw it.

Kernel is 2.6.28-rc8 with selected patches on top. Only possibly relevant
extra patch is Venki's latest PAT fix [1]. I also have Rafael's "rework
suspend/resume ordering" series applied.

Cheers,
FJP

[1] http://lkml.org/lkml/2009/3/12/399

Mar 14 08:21:04 aragorn kernel: [drm] Initialized drm 1.1.0 20060810
Mar 14 08:21:05 aragorn kernel: pci 0000:00:02.0: irq 28 for MSI/MSI-X
Mar 14 08:21:05 aragorn kernel: [drm] Initialized i915 1.6.0 20080730 on minor 0
Mar 14 08:22:49 aragorn kernel: [drm:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 0
Mar 14 08:22:52 aragorn kernel: ------------[ cut here ]------------
Mar 14 08:22:52 aragorn kernel: kernel BUG at /home/fjp/projects/kernel/linux-2.6/drivers/gpu/drm/drm_fops.c:146!
Mar 14 08:22:52 aragorn kernel: invalid opcode: 0000 [#1] SMP
Mar 14 08:22:52 aragorn kernel: last sysfs file: /sys/class/backlight/acpi_video0/brightness
Mar 14 08:22:52 aragorn kernel: CPU 1
Mar 14 08:22:52 aragorn kernel: Modules linked in: i915 drm i2c_algo_bit i2c_core ppdev parport_pc lp parport ipv6 nfsd exportfs nfs lockd 
nfs_acl auth_rpcgss sunrpc ext2 coretemp hp_wmi acpi_cpufreq loop snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_pcm_oss 
snd_mixer_oss snd_pcm arc4 snd_seq_dummy ecb snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event iwlagn iwlcore snd_seq snd_timer 
rfkill snd_seq_device lib80211 mac80211 pcmcia snd joydev intel_agp psmouse iTCO_wdt serio_raw soundcore snd_page_alloc hp_accel cfg80211 
yenta_socket rsrc_nonstatic pcmcia_core container pcspkr wmi video output battery ac button lis3lv02d evdev ext3 jbd mbcache 
sha256_generic aes_x86_64 aes_generic cbc dm_crypt dm_mirror dm_region_hash dm_log dm_snapshot dm_mod sg sr_mod cdrom sd_mod piix ata_piix 
uhci_hcd ide_pci_generic ide_core pata_acpi ohci1394 sdhci_pci sdhci ricoh_mmc ieee1394 mmc_core led_class ata_generic ehci_hcd libata 
scsi_mod e1000e thermal processor fan thermal_sys
Mar 14 08:22:52 aragorn kernel: Pid: 5487, comm: Xorg Not tainted 2.6.29-rc8-rjw #6 HP Compaq 2510p Notebook PC
Mar 14 08:22:52 aragorn kernel: RIP: 0010:[<ffffffffa04eff8b>]  [<ffffffffa04eff8b>] drm_open+0x4b5/0x4ee [drm]
Mar 14 08:22:52 aragorn kernel: RSP: 0018:ffff8800605b7cd8  EFLAGS: 00010206
Mar 14 08:22:52 aragorn kernel: RAX: ffff88007bf295c8 RBX: ffff88007bc18038 RCX: 0000000000000000
Mar 14 08:22:52 aragorn kernel: RDX: ffff880058448528 RSI: ffff8800605b7cc8 RDI: ffff8800605b7c60
Mar 14 08:22:52 aragorn kernel: RBP: ffff8800605b7d18 R08: ffff88007bc18000 R09: ffff88007e038000
Mar 14 08:22:52 aragorn kernel: R10: ffff8800605b7e48 R11: 0000000000000007 R12: 0000000000000000
Mar 14 08:22:52 aragorn kernel: R13: ffff88007bc18000 R14: ffff88007bc18038 R15: ffff880065615f18
Mar 14 08:22:52 aragorn kernel: FS:  00007f5e523c26f0(0000) GS:ffff88007e002b00(0000) knlGS:0000000000000000
Mar 14 08:22:52 aragorn kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Mar 14 08:22:52 aragorn kernel: CR2: 00007f5e4f0d2e60 CR3: 000000007cc16000 CR4: 00000000000006e0
Mar 14 08:22:52 aragorn kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Mar 14 08:22:52 aragorn kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Mar 14 08:22:52 aragorn kernel: Process Xorg (pid: 5487, threadinfo ffff8800605b6000, task ffff8800605ac200)
Mar 14 08:22:52 aragorn kernel: Stack:
Mar 14 08:22:52 aragorn kernel:  ffff88006c4b6b00 ffff880058448528 ffff88007c774c00 00000000ffffffed
Mar 14 08:22:52 aragorn kernel:  ffffffffa04fe800 ffff88006c4b6b00 ffff880058448528 ffff880058448528
Mar 14 08:22:52 aragorn kernel:  ffff8800605b7d48 ffffffffa04efa5a 0000000000000000 ffff88007c711900
Mar 14 08:22:52 aragorn kernel: Call Trace:
Mar 14 08:22:52 aragorn kernel:  [<ffffffffa04efa5a>] drm_stub_open+0xd8/0x154 [drm]
Mar 14 08:22:52 aragorn kernel:  [<ffffffff8029cc33>] chrdev_open+0x161/0x180
Mar 14 08:22:52 aragorn kernel:  [<ffffffff8029cad2>] ? chrdev_open+0x0/0x180
Mar 14 08:22:52 aragorn kernel:  [<ffffffff80298a01>] __dentry_open+0x157/0x273
Mar 14 08:22:52 aragorn kernel:  [<ffffffff80298bea>] nameidata_to_filp+0x41/0x52
Mar 14 08:22:52 aragorn kernel:  [<ffffffff802a3feb>] do_filp_open+0x3e9/0x7fb
Mar 14 08:22:52 aragorn kernel:  [<ffffffff8044cd5a>] ? _spin_unlock+0x9/0xb
Mar 14 08:22:52 aragorn kernel:  [<ffffffff802ad4cb>] ? alloc_fd+0x11d/0x12e
Mar 14 08:22:52 aragorn kernel:  [<ffffffff802987e6>] do_sys_open+0x53/0xda
Mar 14 08:22:52 aragorn kernel:  [<ffffffff80298896>] sys_open+0x1b/0x1d
Mar 14 08:22:52 aragorn kernel:  [<ffffffff8020c25b>] system_call_fastpath+0x16/0x1b
Mar 14 08:22:52 aragorn kernel: Code: 48 89 df e8 20 bd f5 df 48 8b 45 d0 83 78 04 01 75 2f 49 8b 85 38 04 00 00 48 85 c0 74 11 48 8b 55 
c8 48 3b 82 68 01 00 00 74 16 <0f> 0b eb fe 48 8b 55 c8 48 8b 82 68 01 00 00 49 89 85 38 04 00
Mar 14 08:22:52 aragorn kernel: RIP  [<ffffffffa04eff8b>] drm_open+0x4b5/0x4ee [drm]
Mar 14 08:22:52 aragorn kernel:  RSP <ffff8800605b7cd8>
Mar 14 08:22:52 aragorn kernel: ---[ end trace 41be7e0f42a73435 ]---


View attachment "config-2.6.29-rc8-rjw" of type "text/plain" (66984 bytes)

Powered by blists - more mailing lists