[Bug 110421] New: Reading debugfs file /sys/kernel/debug/dri/0/amdgpu_regs hangs the machine
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Wed Jan 6 04:46:41 PST 2016
https://bugzilla.kernel.org/show_bug.cgi?id=110421
Bug ID: 110421
Summary: Reading debugfs file
/sys/kernel/debug/dri/0/amdgpu_regs hangs the machine
Product: Drivers
Version: 2.5
Kernel Version: 4.4.0-0.rc8.git0.1.fc24.x86_64
Hardware: All
OS: Linux
Tree: Fedora
Status: NEW
Severity: high
Priority: P1
Component: Video(DRI - non Intel)
Assignee: drivers_video-dri at kernel-bugs.osdl.org
Reporter: rivanvx at gmail.com
Regression: No
I am using amdgpu driver on
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Amethyst XT [Radeon R9 M295X Mac Edition / R9 380X] [1002:6938] (rev
f1)
Running the following script
for i in $(seq 0 65535); do echo -n "$i: "; dd if=amdgpu_regs bs=4 skip=$i
count=1 2>/dev/null | hexdump -e '"%08x"'; echo; done
hangs the machine at register 14829 and the data from the register is not
printed. I tried reading the registers twice just to be sure it hangs in the
same place repeatedly, and it was 14829 in both cases.
I have reports this is reproducible using vanilla kernel.
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