[BUG] initcall qxl_init+0x0/0x47 returned with preemption imbalance

[Dhaval Giani]

Hi,

I seem to be hitting this on my VM (every reboot).

[    0.681589] ------------[ cut here ]------------
[    0.681600] WARNING: CPU: 1 PID: 1 at init/main.c:708
do_one_initcall+0x175/0x180()
[    0.681617] initcall qxl_init+0x0/0x47 returned with preemption imbalance
[    0.681618] Modules linked in:
[    0.681625] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.15.0-rc3+ #3
[    0.681627] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    0.681629]  0000000000000009 ffff880119a75dc0 ffffffff81856f5c
ffff880119a75e08
[    0.681632]  ffff880119a75df8 ffffffff8108285d 0000000000000000
ffffffff81f9337b
[    0.681635]  0000000000000000 0000000000000000 0000000000000000
ffff880119a75e58
[    0.681638] Call Trace:
[    0.681646]  [<ffffffff81856f5c>] dump_stack+0x45/0x56
[    0.681656]  [<ffffffff8108285d>] warn_slowpath_common+0x7d/0xa0
[    0.681660]  [<ffffffff81f9337b>] ? ttm_init+0x67/0x67
[    0.681664]  [<ffffffff810828cc>] warn_slowpath_fmt+0x4c/0x50
[    0.681667]  [<ffffffff81f9337b>] ? ttm_init+0x67/0x67
[    0.681670]  [<ffffffff81f9337b>] ? ttm_init+0x67/0x67
[    0.681673]  [<ffffffff810021e5>] do_one_initcall+0x175/0x180
[    0.681683]  [<ffffffff81f4c0d8>] kernel_init_freeable+0x19b/0x223
[    0.681687]  [<ffffffff81f4b8e5>] ? do_early_param+0x88/0x88
[    0.681699]  [<ffffffff8184ced0>] ? rest_init+0x80/0x80
[    0.681703]  [<ffffffff8184cede>] kernel_init+0xe/0xf0
[    0.681708]  [<ffffffff8186747c>] ret_from_fork+0x7c/0xb0
[    0.681711]  [<ffffffff8184ced0>] ? rest_init+0x80/0x80
[    0.681717] ---[ end trace 73502b4ce9e2c5a6 ]---

along with
[    0.688590] BUG: workqueue leaked lock or atomic: kworker/1:1/0x00000003/41
     last function: qxl_fb_work
[    0.688613] CPU: 1 PID: 41 Comm: kworker/1:1 Tainted: G        W
 3.15.0-rc3+ #3
[    0.688615] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    0.688618] Workqueue: events qxl_fb_work
[    0.688620]  ffff8800db4e4580 ffff8800db505e20 ffffffff81856f5c
ffff8800d9973b48
[    0.688623]  ffff8800db505e68 ffffffff8109c7e6 000000001fc93b80
0000000000000000
[    0.688625]  ffff88011fc93b80 ffff88011fc93b98 ffff8800db4e45b0
ffff880119542540
[    0.688628] Call Trace:
[    0.688634]  [<ffffffff81856f5c>] dump_stack+0x45/0x56
[    0.688639]  [<ffffffff8109c7e6>] process_one_work+0x346/0x430
[    0.688642]  [<ffffffff8109d22b>] worker_thread+0x11b/0x3a0
[    0.688644]  [<ffffffff8109d110>] ? rescuer_thread+0x340/0x340
[    0.688648]  [<ffffffff810a3982>] kthread+0xd2/0xf0
[    0.688652]  [<ffffffff810a38b0>] ? insert_kthread_work+0x40/0x40
[    0.688655]  [<ffffffff8186747c>] ret_from_fork+0x7c/0xb0
[    0.688658]  [<ffffffff810a38b0>] ? insert_kthread_work+0x40/0x40

(At least it seems to be a direct result of the premption imbalance earlier)

I have seen this for at least 3.14 as well but I was not paying too
much attention to it.

Attached are dmesg and config.

Thanks!
Dhaval
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