Public bug reported:
This bug go the code path
drvers/gpu/drm/{drm_prime.c,drm_gem.c}
drm_gem_prime_fd_to_handle()
| mutex_lock(&file_priv->prime.lock);
| drm_gem_handle_create_tail()
| | dev->driver->gem_open_object() (for amdgpu.ko driver, this is
amdgpu_gem_object_open)
| | drm_gem_handle_delete()
| | | drm_gem_remove_prime_handles()
| | | | mutex_lock(&filp->prime.lock);
This causes the dead lock if gem_open_object() return with error.
Patch fixing this is already in Linux 4.5:
https://github.com/torvalds/linux/commit/6984128d01cf935820a0563f3a00c6623ba58109
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-generic 4.4.0.22.23
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: yuq 1566 F.... pulseaudio
/dev/snd/controlC1: yuq 1566 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon May 9 11:20:26 2016
HibernationDevice: RESUME=UUID=2e71a82b-c613-4a96-88e3-0672a366c396
InstallationDate: Installed on 2016-03-01 (69 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160228)
IwConfig:
enp7s0 no wireless extensions.
lo no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. X58A-UD3R
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic
root=UUID=c137e0c1-ad99-47f4-acf5-e7f4792afa9e ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.4.0-22-generic N/A
linux-backports-modules-4.4.0-22-generic N/A
linux-firmware 1.157
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/23/2010
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: FE
dmi.board.name: X58A-UD3R
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias:
dmi:bvnAwardSoftwareInternational,Inc.:bvrFE:bd12/23/2010:svnGigabyteTechnologyCo.,Ltd.:pnX58A-UD3R:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnX58A-UD3R:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: X58A-UD3R
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: apport-bug
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https://bugs.launchpad.net/bugs/1579610
Title:
drm.ko < kernel version 4.5 has a dead lock bug
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