[Bug 106003] [CI] igt at gem_eio@in-flight-internal - dmesg-warn - WARNING: bad unlock balance detected!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106003

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 40da1d310e8a155a09cd64b5b3fd3548a9dcfda0
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Apr 5 13:37:14 2018 +0100

    drm/i915: Only call finish_reset after a prepare_reset

    If we skip the intel_prepare_reset(), we should also skip the
    intel_display_reset(). If we we use a flag set by intel_prepare_reset()
    then we do not have to second guess based on external user controlled
    state whether or not the prepare was called before deciding to finish
    it after the reset. igt/gem_eio is one such example that may tweak
    i915.reset faster than the code is expecting, leading to

    [  190.233528] =====================================
    [  190.233534] WARNING: bad unlock balance detected!
    [  190.233540] 4.16.0-rc7-g335ef9849310-drmtip_10+ #1 Tainted: G     U
    [  190.233547] -------------------------------------
    [  190.233553] gem_eio/1348 is trying to release lock
(crtc_ww_class_acquire) at:
    [  190.233569] [<ffffffff895c7810>] drm_modeset_acquire_fini+0x0/0x60
    [  190.233575] but there are no more locks to release!
    [  190.233580]
                   other info that might help us debug this:
    [  190.233588] 3 locks held by gem_eio/1348:
    [  190.233592]  #0:  (&f->f_pos_lock){+.+.}, at: [<00000000ab90c784>]
__fdget_pos+0x3a/0x50
    [  190.233607]  #1:  (sb_writers#11){.+.+}, at: [<00000000e1529265>]
vfs_write+0x188/0x1a0
    [  190.233622]  #2:  (&attr->mutex){+.+.}, at: [<0000000011f40afe>]
simple_attr_write+0x36/0xd0
    [  190.233635]
                   stack backtrace:
    [  190.233644] CPU: 0 PID: 1348 Comm: gem_eio Tainted: G     U          
4.16.0-rc7-g335ef9849310-drmtip_10+ #1
    [  190.233655] Hardware name: Dell Inc.                 OptiPlex GX280     
         /0G8310, BIOS A04 02/09/2005
    [  190.233664] Call Trace:
    [  190.233674]  dump_stack+0x67/0x95
    [  190.233682]  ? drm_modeset_backoff+0x1b0/0x1b0
    [  190.233690]  print_unlock_imbalance_bug+0xd2/0xe0
    [  190.233698]  ? drm_modeset_backoff+0x1b0/0x1b0
    [  190.233704]  lock_release+0x23e/0x300
    [  190.233712]  drm_modeset_acquire_fini+0x16/0x60
    [  190.233835]  intel_finish_reset+0x72/0x160 [i915]
    [  190.233894]  i915_reset_device+0x1e9/0x240 [i915]
    [  190.233953]  ? __intel_get_crtc_scanline+0x1c0/0x1c0 [i915]
    [  190.233962]  ? work_on_cpu_safe+0x50/0x50
    [  190.234020]  i915_handle_error+0x1f2/0x470 [i915]
    [  190.234031]  ? __might_fault+0x39/0x90
    [  190.234037]  ? __might_fault+0x39/0x90
    [  190.234099]  i915_wedged_set+0x7f/0xc0 [i915]
    [  190.234107]  simple_attr_write+0xb0/0xd0
    [  190.234117]  full_proxy_write+0x51/0x80
    [  190.234125]  __vfs_write+0x21/0x140
    [  190.234133]  ? rcu_read_lock_sched_held+0x6f/0x80
    [  190.234140]  ? rcu_sync_lockdep_assert+0x29/0x50
    [  190.234147]  ? __sb_start_write+0x152/0x1f0
    [  190.234152]  ? __sb_start_write+0x168/0x1f0
    [  190.234159]  vfs_write+0xbd/0x1a0
    [  190.234166]  SyS_write+0x40/0xa0
    [  190.234173]  ? do_syscall_64+0x19/0x1b0
    [  190.234180]  do_syscall_64+0x6b/0x1b0
    [  190.234188]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
    [  190.234196] RIP: 0033:0x7f84c1b392b7
    [  190.234201] RSP: 002b:00007f84b6755b00 EFLAGS: 00000293 ORIG_RAX:
0000000000000001
    [  190.234211] RAX: ffffffffffffffda RBX: 0000000000000046 RCX:
00007f84c1b392b7
    [  190.234218] RDX: 0000000000000002 RSI: 000055ec20abc8d6 RDI:
0000000000000046
    [  190.234225] RBP: 000055ec20abc8d6 R08: 0000000000000000 R09:
0000000000000000
    [  190.234231] R10: 0000000000000000 R11: 0000000000000293 R12:
0000000000000002
    [  190.234238] R13: 0000000000000000 R14: 00007f84b0000b20 R15:
000055ec20ce4eb8

    Testcase: igt/gem_eio
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180405123714.3638-1-chris@chris-wilson.co.uk

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