Hi,
Here is an adreno regression I noticed on imx53 running 5.5.13:
[ 21.283902] ======================================================
[ 21.290148] WARNING: possible circular locking dependency detected
[ 21.296409] 5.5.13 #1 Not tainted
[ 21.299785] ------------------------------------------------------
[ 21.306030] kworker/u2:1/19 is trying to acquire lock:
[ 21.311236] dc888ae8 (reservation_ww_class_mutex){+.+.}, at:
dma_buf_detach+0x78/0x1e0
[ 21.319341]
[ 21.319341] but task is already holding lock:
[ 21.325232] dc88838c (&msm_obj->lock){+.+.}, at:
msm_gem_free_work+0x100/0x188
[ 21.332587]
[ 21.33258[ 32.525073] evbug: Event. Dev: input1, Type: 3, Code:
1, Value: 41
[ 32.531942] evbug: Event. Dev: input1, Type: 0, Code: 0, Value: 0
7] which lock already depends on the new lock.
[ 21.332587]
[ 21.340823]
[ 21.340823] the existing dependency chain (in reverse order) is:
[ 21.348362]
[ 21.348362] -> #1 (&msm_obj->lock){+.+.}:
[ 21.353989] mutex_lock_nested+0x1c/0x24
[ 21.358514] msm_gem_get_and_pin_iova+0x30/0x158
[ 21.363733] msm_ioctl_gem_submit+0xa90/0x1148
[ 21.368775] drm_ioctl_kernel+0xa4/0xec
[ 21.373203] drm_ioctl+0x1e0/0x3c8
[ 21.377215] do_vfs_ioctl+0x9c/0xa68
[ 21.381388] ksys_ioctl+0x34/0x60
[ 21.385304] ret_fast_syscall+0x0/0x28
[ 21.389646] 0xbea6f8d8
[ 21.392670]
[ 21.392670] -> #0 (reservation_ww_class_mutex){+.+.}:
[ 21.399333] lock_acquire+0xcc/0x1ec
[ 21.403516] __ww_mutex_lock.constprop.8+0x94/0x10a4
[ 21.409080] ww_mutex_lock+0x78/0xb0
[ 21.413261] dma_buf_detach+0x78/0x1e0
[ 21.417637] drm_prime_gem_destroy+0x2c/0x38
[ 21.422505] msm_gem_free_work+0x88/0x188
[ 21.427133] process_one_work+0x2c4/0x754
[ 21.431744] worker_thread+0x2c/0x590
[ 21.436015] kthread+0x134/0x148
[ 21.439838] ret_from_fork+0x14/0x20
[ 21.444000] 0x0
[ 21.446418]
[ 21.446418] other info that might help us debug this:
[ 21.446418]
[ 21.454483] Possible unsafe locking scenario:
[ 21.454483]
[ 21.460460] CPU0 CPU1
[ 21.465044] ---- ----
[ 21.469627] lock(&msm_obj->lock);
[ 21.473190] lock(reservation_ww_class_mutex);
[ 21.480314] lock(&msm_obj->lock);
[ 21.486392] lock(reservation_ww_class_mutex);
[ 21.490996]
[ 21.490996] *** DEADLOCK ***
[ 21.490996]
[ 21.496985] 4 locks held by kworker/u2:1/19:
[ 21.501311] #0: dc43a6a0 ((wq_completion)msm){+.+.}, at:
process_one_work+0x210/0x754
[ 21.509358] #1: dc207f1c
((work_completion)(&priv->free_work)){+.+.}, at:
process_one_work+0x210/0x754
[ 21.518876] #2: dc3a7070 (&dev->struct_mutex){+.+.}, at:
msm_gem_free_work+0x4c/0x188
[ 21.526915] #3: dc88838c (&msm_obj->lock){+.+.}, at:
msm_gem_free_work+0x100/0x188
[ 21.534692]
[ 21.534692] stack backtrace:
[ 21.539136] CPU: 0 PID: 19 Comm: kworker/u2:1 Not tainted 5.5.13 #1
[ 21.545470] Hardware name: Freescale i.MX53 (Device Tree Support)
[ 21.551667] Workqueue: msm msm_gem_free_work
[ 21.556087] [<c0112e18>] (unwind_backtrace) from [<c010cda0>]
(show_stack+0x10/0x14)
[ 21.563950] [<c010cda0>] (show_stack) from [<c0c9989c>]
(dump_stack+0xe4/0x11c)
[ 21.571372] [<c0c9989c>] (dump_stack) from [<c0180334>]
(check_noncircular+0x130/0x1e4)
[ 21.579486] [<c0180334>] (check_noncircular) from [<c0182450>]
(__lock_acquire+0xf58/0x2458)
[ 21.588030] [<c0182450>] (__lock_acquire) from [<c01841bc>]
(lock_acquire+0xcc/0x1ec)
[ 21.595976] [<c01841bc>] (lock_acquire) from [<c0cb887c>]
(__ww_mutex_lock.constprop.8+0x94/0x10a4)
[ 21.605134] [<c0cb887c>] (__ww_mutex_lock.constprop.8) from
[<c0cb99b4>] (ww_mutex_lock+0x78/0xb0)
[ 21.614207] [<c0cb99b4>] (ww_mutex_lock) from [<c070c078>]
(dma_buf_detach+0x78/0x1e0)
[ 21.622239] [<c070c078>] (dma_buf_detach) from [<c06276e8>]
(drm_prime_gem_destroy+0x2c/0x38)
[ 21.630874] [<c06276e8>] (drm_prime_gem_destroy) from [<c0696b48>]
(msm_gem_free_work+0x88/0x188)
[ 21.639854] [<c0696b48>] (msm_gem_free_work) from [<c0148228>]
(process_one_work+0x2c4/0x754)
[ 21.648487] [<c0148228>] (process_one_work) from [<c01486e4>]
(worker_thread+0x2c/0x590)
[ 21.656681] [<c01486e4>] (worker_thread) from [<c01505f0>]
(kthread+0x134/0x148)
[ 21.664176] [<c01505f0>] (kthread) from [<c01010b4>]
(ret_from_fork+0x14/0x20)
[ 21.671470] Exception stack(0xdc207fb0 to 0xdc207ff8)
In order to reproduce it, I just launch kmscube and it starts running normally.
Then I do a "CTRL + C" and the message below appears.
Testing on 5.4.x I don't see this problem.
I haven't started bisecting this yet, but just checking if anyone has
any ideas first.
Thanks,
Fabio Estevam
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