[Bug 96532] [BISECTED: 0955c1250e] 4.7-rc1 oops at drm_connector_cleanup+0x5c/0x1d0

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96532

George Spelvin  changed:

   What|Removed |Added

 Resolution|--- |FIXED
 Status|NEW |RESOLVED

--- Comment #2 from George Spelvin  ---
Confirmed fixed in v4.7-rc5.  Fixed by this patch (in v4.7-rc3):

commit fffc5f59f2c68ca859c3f92b224393ed3adbe1ca
Author: Philipp Zabel 
Date:   Thu Jun 2 19:27:51 2016 +0200

drm/crtc: fix connector reference counting mismatch in
drm_crtc_helper_set_config

Duplicate of
https://bugzilla.kernel.org/show_bug.cgi?id=119861

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[Bug 96532] [BISECTED: 0955c1250e] 4.7-rc1 oops at drm_connector_cleanup+0x5c/0x1d0

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96532

--- Comment #1 from Thorsten Leemhuis  ---
George, have you seen the mail from Lucas, who wrote: "Probably the same bug as 
https://bugzilla.kernel.org/show_bug.cgi?id=119861 and already fixed in
the last -rc." Can you confirm if this issue is fixed?

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[Bug 96532] [BISECTED: 0955c1250e] 4.7-rc1 oops at drm_connector_cleanup+0x5c/0x1d0

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96532

George Spelvin  changed:

   What|Removed |Added

   Keywords||bisected, have-backtrace,
   ||regression

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[Bug 96532] [BISECTED: 0955c1250e] 4.7-rc1 oops at drm_connector_cleanup+0x5c/0x1d0

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96532

Bug ID: 96532
   Summary: [BISECTED: 0955c1250e] 4.7-rc1 oops at
drm_connector_cleanup+0x5c/0x1d0
   Product: DRI
   Version: unspecified
  Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
  Severity: normal
  Priority: medium
 Component: DRM/other
  Assignee: dri-devel at lists.freedesktop.org
  Reporter: linux at sciencehorizons.net
CC: airlied at freedesktop.org, daniel at ffwll.ch,
daniel at fooishbar.org

Attempting to start X on 4.7-rc1 leads to kernel oops, black screen, and
console lockup.  (ssh login still works.)

Problem bisected to 0955c1250e ("drm/crtc: take references to connectors used
in a modeset. (v2)").  Reverting that single commit produces working X (which
is what I'm running with currently).

Video card is old and non-fancy:
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GT216 [GeForce
210] [10de:0a23] (rev a2)

In case it matters, I'm running 32-bit userland (Debian/unstable) on a 64-bit
kernel.

[  212.149973] nouveau :02:00.0: DRM: DDC responded, but no EDID for VGA-1
[  213.842270] BUG: unable to handle kernel NULL pointer dereference at
0008
[  213.842283] IP: [] drm_connector_cleanup+0x5c/0x1d0
[  213.842290] PGD 41779c067 PUD 0 
[  213.842294] Oops: 0002 [#1] SMP 
[  213.842297] Modules linked in: nfsd lockd grace sunrpc via_velocity
x86_pkg_temp_thermal input_leds crc32_pclmul crc32c_intel led_class [last
unloaded: twofish_common]
[  213.842313] CPU: 0 PID: 5362 Comm: Xorg Not tainted
4.6.0-rc3-00678-g0955c125 #541
[  213.842317] Hardware name: Gigabyte Technology Co., Ltd. To be filled by
O.E.M./X79-UP4, BIOS F7 03/19/2014
[  213.842320] task: 880420c42580 ti: 880417404000 task.ti:
880417404000
[  213.842324] RIP: 0010:[]  []
drm_connector_cleanup+0x5c/0x1d0
[  213.842329] RSP: 0018:880417407c08  EFLAGS: 00010206
[  213.842331] RAX:  RBX: 8800b9d79000 RCX:
ea0010acde00
[  213.842511] RDX: dead0200 RSI: 88042b881078 RDI:
0007
[  213.842982] RBP: 88042b96e800 R08: 88042b881078 R09:
000180080007
[  213.843459] R10: ea0010ae2000 R11: 88042d803301 R12:
8800b9d79078
[  213.843929] R13: dead0200 R14: dead0100 R15:

[  213.844414] FS:  () GS:88043fc0(0063)
knlGS:f708b880
[  213.844896] CS:  0010 DS: 002b ES: 002b CR0: 80050033
[  213.845369] CR2: 0008 CR3: 000417796000 CR4:
001406f0
[  213.845557] Stack:
[  213.845557]  8800b9d79000 0001 88042b4e3000
8800b9d79000
[  213.845557]  88042b881000 0001 813fda8c
88042b96eb88
[  213.845557]  81328557 880420c42580 88042c271190
8800b9d79000
[  213.845557] Call Trace:
[  213.845557]  [] ? nouveau_connector_destroy+0x2c/0x50
[  213.845557]  [] ? drm_crtc_helper_set_config+0xa17/0xce0
[  213.845557]  [] ? nouveau_crtc_set_config+0x4c/0x110
[  213.845557]  [] ? drm_mode_set_config_internal+0x5c/0x110
[  213.845557]  [] ? drm_mode_setcrtc+0x42c/0x540
[  213.845557]  [] ? drm_ioctl+0x12c/0x4e0
[  213.845557]  [] ? drm_mode_setplane+0x1c0/0x1c0
[  213.845557]  [] ? nouveau_drm_ioctl+0x61/0xb0
[  213.845557]  [] ? nouveau_compat_ioctl+0xb/0x20
[  213.845557]  [] ? compat_SyS_ioctl+0x95/0x1890
[  213.845557]  [] ? SyS_write+0x3d/0x90
[  213.845557]  [] ? do_fast_syscall_32+0x8d/0x140
[  213.845557]  [] ? entry_SYSENTER_compat+0x4f/0x5e
[  213.845557] Code: 48 8b 73 78 4c 8d 63 78 49 be 00 01 00 00 00 00 ad de 49
bd 00 02 00 00 00 00 ad de 48 8b 06 4c 39 e6 49 89 c7 74 2b 48 8b 56 08 <48> 89
50 08 48 89 02 4c 89 36 4c 89 6e 08 48 8b 3b e8 5e 2b 00 
[  213.845557] RIP  [] drm_connector_cleanup+0x5c/0x1d0
[  213.845557]  RSP 
[  213.845557] CR2: 0008
[  213.858256] ---[ end trace e4f18a1100ceeb21 ]---

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