| Summary: | [SNB] i915 4.11.0-rc1 circular locking dependency detected, switcheroo-cont/776 is trying to acquire lock | ||||||||
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| Product: | DRI | Reporter: | Chris Murphy <bugzilla> | ||||||
| Component: | DRM/Radeon | Assignee: | Default DRI bug account <dri-devel> | ||||||
| Status: | RESOLVED MOVED | QA Contact: | |||||||
| Severity: | normal | ||||||||
| Priority: | medium | CC: | bugzilla, intel-gfx-bugs, jwrdegoede | ||||||
| Version: | unspecified | ||||||||
| Hardware: | Other | ||||||||
| OS: | All | ||||||||
| Whiteboard: | |||||||||
| i915 platform: | SNB | i915 features: | |||||||
| Attachments: |
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The locking backtrace shows the problem between the radeon driver and the tty/fbcon ones, not the Intel driver. Switcheroo-control disables the discrete GPU during bootup, so that only the Intel/integrated GPU is enabled by default. https://github.com/hadess/switcheroo-control/blob/master/src/switcheroo-control.c#L223 would be roughly equivalent to: echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch as root. Created attachment 132741 [details]
journal konly 4.13.0-rc1
Same hardware, different kernel, same 'possible circular locking dependency detected' message but different instigator, this time it's consistently saying 'plymouthd/363 is trying to acquire lock'
drm.debug=0x1e enabled, is a debug kernel
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Created attachment 130151 [details] journal konly 4.11.0-rc1+debug drm.debug=0x1e During boot, an INFO message pops up shortly after switcheroo-control.service is started. BOOT_IMAGE=/vmlinuz-4.11.0-0.rc1.git0.1.fc26.x86_64+debug root=UUID=15910530-9840-49af-b948-34eb9599442e ro rootflags=subvol=root00 elevator=deadline drm.debug=0x1e enforcing=0 [ 7.670365] localhost.localdomain kernel: snd_hda_intel 0000:01:00.1: Disabling via vga_switcheroo [ 7.673522] localhost.localdomain kernel: [ 7.673522] localhost.localdomain kernel: ====================================================== [ 7.673523] localhost.localdomain kernel: [ INFO: possible circular locking dependency detected ] [ 7.673524] localhost.localdomain kernel: 4.11.0-0.rc1.git0.1.fc26.x86_64+debug #1 Not tainted [ 7.673525] localhost.localdomain kernel: ------------------------------------------------------- [ 7.673525] localhost.localdomain kernel: switcheroo-cont/776 is trying to acquire lock: [ 7.673526] localhost.localdomain kernel: (console_lock){+.+.+.}, at: [<ffffffffba631389>] vga_switchto_stage2+0x99/0x130 [ 7.673532] localhost.localdomain kernel: but task is already holding lock: [ 7.673532] localhost.localdomain kernel: (vgasr_mutex){+.+.+.}, at: [<ffffffffba631a4a>] vga_switcheroo_debugfs_write+0x8a/0x3f0 [ 7.673535] localhost.localdomain kernel: which lock already depends on the new lock.