[Bug 93477] New: loop in pipe configuration computation

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93477

            Bug ID: 93477
           Summary: loop in pipe configuration computation
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chris at chris-wilson.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

[  233.751747] ------------[ cut here ]------------
[  233.751759] WARNING: CPU: 2 PID: 3737 at
drivers/gpu/drm/i915/intel_display.c:12407 intel_atomic_check+0xe9c/0x1100()
[  233.751761] loop in pipe configuration computation
[  233.751764] CPU: 2 PID: 3737 Comm: Xorg Tainted: G        W       4.4.0-rc6+
#501
[  233.751766] Hardware name: Intel Corporation Shark Bay Client
platform/Basking Ridge, BIOS HSWLPTU1.86C.0131.R01.1307040815 07/04/2013
[  233.751767]  ffffffff8179a8b0 ffff8800a1adfaa8 ffffffff8125b4e9
0000000000000000
[  233.751772]  ffff8800a1adfaf8 ffff8800a1adfae8 ffffffff8106c342
000008c8000007f8
[  233.751776]  ffff8800a1a03600 0000000000000001 ffff880148b7d000
ffff880148b4e000
[  233.751779] Call Trace:
[  233.751786]  [<ffffffff8125b4e9>] dump_stack+0x45/0x5c
[  233.751789]  [<ffffffff8106c342>] warn_slowpath_common+0x92/0xd0
[  233.751791]  [<ffffffff8106c3f6>] warn_slowpath_fmt+0x46/0x50
[  233.751794]  [<ffffffff813bb264>] ? intel_link_compute_m_n+0x54/0x70
[  233.751795]  [<ffffffff813bc11c>] intel_atomic_check+0xe9c/0x1100
[  233.751799]  [<ffffffff8133c7af>] drm_atomic_check_only+0x15f/0x5b0
[  233.751801]  [<ffffffff8133c2c9>] ?
drm_atomic_set_crtc_for_connector+0x29/0xa0
[  233.751803]  [<ffffffff8133cc20>] drm_atomic_commit+0x20/0x70
[  233.751808]  [<ffffffff813183a7>] drm_atomic_helper_set_config+0x77/0xb0
[  233.751811]  [<ffffffff8132b508>] drm_mode_set_config_internal+0x68/0x100
[  233.751813]  [<ffffffff8132b8a8>] drm_mode_setcrtc+0xe8/0x510
[  233.751815]  [<ffffffff813217f5>] drm_ioctl+0x255/0x4f0
[  233.751818]  [<ffffffff811b85e9>] ? ext4_file_write_iter+0x159/0x370
[  233.751820]  [<ffffffff8132b7c0>] ? drm_crtc_check_viewport+0xa0/0xa0
[  233.751823]  [<ffffffff8115b2e3>] do_vfs_ioctl+0x83/0x4d0
[  233.751826]  [<ffffffff81075e07>] ? recalc_sigpending+0x17/0x30
[  233.751827]  [<ffffffff81076437>] ? __set_task_blocked+0x37/0x80
[  233.751830]  [<ffffffff8114e042>] ? __sb_end_write+0x22/0x30
[  233.751832]  [<ffffffff8107887f>] ? __set_current_blocked+0x3f/0x60
[  233.751834]  [<ffffffff8115b77c>] SyS_ioctl+0x4c/0x90
[  233.751836]  [<ffffffff81078add>] ? SyS_rt_sigprocmask+0x8d/0xb0
[  233.751840]  [<ffffffff8152e6d7>] entry_SYSCALL_64_fastpath+0x12/0x6a
[  233.751841] ---[ end trace c24109ba1fac09a5 ]---
[  233.753439] ------------[ cut here ]------------
[  233.753445] WARNING: CPU: 2 PID: 3737 at
drivers/gpu/drm/i915/intel_display.c:12407 intel_atomic_check+0xe9c/0x1100()
[  233.753447] loop in pipe configuration computation
[  233.753448] CPU: 2 PID: 3737 Comm: Xorg Tainted: G        W       4.4.0-rc6+
#501
[  233.753450] Hardware name: Intel Corporation Shark Bay Client
platform/Basking Ridge, BIOS HSWLPTU1.86C.0131.R01.1307040815 07/04/2013
[  233.753451]  ffffffff8179a8b0 ffff8800a1adfaa8 ffffffff8125b4e9
0000000000000000
[  233.753454]  ffff8800a1adfaf8 ffff8800a1adfae8 ffffffff8106c342
000008c8000007f8
[  233.753457]  ffff8800a148f000 0000000000000001 ffff880148b7d000
ffff880148b4e000
[  233.753460] Call Trace:
[  233.753463]  [<ffffffff8125b4e9>] dump_stack+0x45/0x5c
[  233.753466]  [<ffffffff8106c342>] warn_slowpath_common+0x92/0xd0
[  233.753467]  [<ffffffff8106c3f6>] warn_slowpath_fmt+0x46/0x50
[  233.753469]  [<ffffffff813bb264>] ? intel_link_compute_m_n+0x54/0x70
[  233.753470]  [<ffffffff813bc11c>] intel_atomic_check+0xe9c/0x1100
[  233.753472]  [<ffffffff8133c7af>] drm_atomic_check_only+0x15f/0x5b0
[  233.753474]  [<ffffffff8133c2c9>] ?
drm_atomic_set_crtc_for_connector+0x29/0xa0
[  233.753476]  [<ffffffff8133cc20>] drm_atomic_commit+0x20/0x70
[  233.753479]  [<ffffffff813183a7>] drm_atomic_helper_set_config+0x77/0xb0
[  233.753481]  [<ffffffff8132b508>] drm_mode_set_config_internal+0x68/0x100
[  233.753482]  [<ffffffff8132b8a8>] drm_mode_setcrtc+0xe8/0x510
[  233.753484]  [<ffffffff813217f5>] drm_ioctl+0x255/0x4f0
[  233.753486]  [<ffffffff8132b7c0>] ? drm_crtc_check_viewport+0xa0/0xa0
[  233.753488]  [<ffffffff8115b2e3>] do_vfs_ioctl+0x83/0x4d0
[  233.753490]  [<ffffffff81075e07>] ? recalc_sigpending+0x17/0x30
[  233.753491]  [<ffffffff81076437>] ? __set_task_blocked+0x37/0x80
[  233.753493]  [<ffffffff8107887f>] ? __set_current_blocked+0x3f/0x60
[  233.753495]  [<ffffffff8115b77c>] SyS_ioctl+0x4c/0x90
[  233.753496]  [<ffffffff81078add>] ? SyS_rt_sigprocmask+0x8d/0xb0
[  233.753500]  [<ffffffff8152e6d7>] entry_SYSCALL_64_fastpath+0x12/0x6a
[  233.753501] ---[ end trace c24109ba1fac09a6 ]---

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