| Bug ID | 105051 |
|---|---|
| Summary | circular locking, |
| Product | DRI |
| Version | unspecified |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/other |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | bugzilla@colorremedies.com |
4.16.0-0.rc0.git9.1.fc28.x86_64 which is "linux-next" git f9f1e414128e
[ 9.523799] switcheroo-cont/889 is trying to acquire lock:
[ 9.523799] (console_lock){+.+.}, at: [<000000002c1cc7fb>]
vga_switchto_stage2+0x93/0x130
[ 9.523806]
but task is already holding lock:
[ 9.523807] (vgasr_mutex){+.+.}, at: [<000000007e504e29>]
vga_switcheroo_debugfs_write+0x6b/0x360
[ 9.523810]
which lock already depends on the new lock.
[ 9.523810]
the existing dependency chain (in reverse order) is:
[ 9.523810]
-> #3 (vgasr_mutex){+.+.}:
[ 9.523812]
-> #2 (&helper->lock){+.+.}:
[ 9.523814]
-> #1 ((fb_notifier_list).rwsem){++++}:
[ 9.523816]
-> #0 (console_lock){+.+.}:
[ 9.523818]
other info that might help us debug this:
[ 9.523818] Chain exists of:
console_lock --> &helper->lock --> vgasr_mutex
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