Bug 15228

Summary: Xorg blocked in vga_get
Product: Drivers Reporter: Adam Majer (adamm)
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: RESOLVED OBSOLETE    
Severity: normal CC: akpm, alan
Priority: P1    
Hardware: All   
OS: Linux   
URL: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=568421
Kernel Version: 2.6.32 Subsystem:
Regression: No Bisected commit-id:
Attachments: Xorg.0.log

Description Adam Majer 2010-02-04 20:10:40 UTC 
I've been asked to forward this bug report to the kernel team. Apparently the latest X (7.5) in Debian uses this new interface. I see exactly the same issue whether I use nvidia binary drivers or nv driver. Downgrading X to 7.4 completely resolves this issue.

dmesg reports,

[  840.676052] INFO: task Xorg:3075 blocked for more than 120 seconds.
[  840.676060] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  840.676067] Xorg          D 0000000000000000     0  3075   3060 0x00400000
[  840.676078]  ffff880100861e28 0000000000000082 0000000000000000 0000000000000008
[  840.676088]  0000000000000400 ffffffff81408094 000000000000f8a0 ffff880100861fd8
[  840.676097]  00000000000155c0 00000000000155c0 ffff88013bcbebd0 ffff88013fab3980
[  840.676106] Call Trace:
[  840.676123]  [<ffffffff812339b7>] vga_get+0x115/0x141
[  840.676133]  [<ffffffff8104f777>] ? default_wake_function+0x0/0x14
[  840.676141]  [<ffffffff81233a14>] ? vga_arb_write+0x31/0x449
[  840.676148]  [<ffffffff81233aa6>] vga_arb_write+0xc3/0x449
[  840.676157]  [<ffffffff8116bbe4>] ? security_file_permission+0x16/0x18
[  840.676168]  [<ffffffff81102538>] vfs_write+0xb0/0x10a
[  840.676176]  [<ffffffff81102660>] sys_write+0x4c/0x74
[  840.676184]  [<ffffffff81010db2>] system_call_fastpath+0x16/0x1b


Attached is a full Xorg.0.log
Comment 1 Adam Majer 2010-02-04 20:14:10 UTC 
Created attachment 24910 [details]
Xorg.0.log
Comment 2 Andrew Morton 2010-02-04 20:15:43 UTC 
Reassigned to DRI.

Do you think this is a regression?  Is any earlier kernel version OK with that X version?

Thanks.
Comment 3 Adam Majer 2010-02-07 19:32:59 UTC 
I don't think this is a regression. I've just tested X 7.5 with kernel 2.6.26, 2.6.32-rc8 and 2.6.32 with the same results. I will test if removing one of the GPUs makes a difference.