[Bug 99488] [r600g]OpenCL driver causes process to hang in ImageMagick's Gaussian Blur kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99488

--- Comment #1 from nixscripter at gmail.com ---
I'm still trying some versions in order to help you guys pin this down (it's
not always easy to tell what reinstall is having what effect, since Arch Linux
has three packages involved). In the mean time, I did the basics on the process
in its hung state.

It's currently running three threads, two blocked, one continuing to run:

(gdb) info threads 
  Id   Target Id         Frame 
* 1    Thread 0x39ac9cdf7c0 (LWP 3806) "display" 0x0000039abefef921 in
llvm::MachineInstr::findRegisterDefOperandIdx(unsigned int, bool, bool,
llvm::TargetRegisterInfo const*) const () from /usr/lib/libLLVM-5.0svn.so
  2    Thread 0x39abd04f700 (LWP 3809) "radeon_cs:0" 0x0000039ac6b0310f in
pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
  3    Thread 0x39abadd4700 (LWP 3814) "display" futex_wait (val=8, 
    addr=0x25349d4)
    at /build/gcc-multilib/src/gcc/libgomp/config/linux/x86/futex.h:44
(gdb)


What is that call to findRegisterDefOperandIdx doing? It's not entirely clear,
but it's sucking up a lot of memory. Running strace confirms that: 

strace: Process 3806 attached with 3 threads
strace: [ Process PID=3806 runs in x32 mode. ]
[pid  3809] futex(0x2599e64, FUTEX_WAIT_PRIVATE, 1, NULL <unfinished ...>
[pid  3814] futex(0x25349d4, FUTEX_WAIT_PRIVATE, 8, NULL <unfinished ...>
[pid  3806] mmap(NULL, 8392704, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x640f4000
strace: [ Process PID=3806 runs in 64 bit mode. ]
[pid  3806] mmap(NULL, 8392704, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x39a638f3000
[pid  3806] mmap(NULL, 8392704, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x39a630f2000
[pid  3806] mmap(NULL, 8392704, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x39a628f1000
[...]

And down the address space it goes, 0x1000 bytes (4k) a time or two per second.

Looking at the function name, I'm thinking about what Jan said on another bug:

> the hang is probably a separate bug. ImageMagick test suite results on my Turks GPU are:
> # TOTAL: 86
> # PASS:  78
> # SKIP:  0
> # XFAIL: 0
> # FAIL:  3
> # XPASS: 0
> # ERROR: 5
>
> the errors and failures are accompanied by:
> Assertion `i < getNumRegs() && "Register number out of range!"' failed.

Could this be perhaps the same registers that were out of range on a different
card?

Either way, I will continue to investigate, and hope to narrow down the issue
soon.

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