[Nouveau] [Bug 97537] New: nvc0 occasionally crashes in glDrawArrays in a multi-threaded app

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97537

            Bug ID: 97537
           Summary: nvc0 occasionally crashes in glDrawArrays in a
                    multi-threaded app
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: shinji.suzuki at gmail.com
        QA Contact: nouveau at lists.freedesktop.org

Ubuntu 16.04.01 LTS (version of libgl1-mesa-dri is 11.2.0-1ubuntu2.1) / Nvidia
Quadro K4000.

I am examining a sample app from SDK for a video capture card. The app is
multi-threaded. The app runs fine for some time (line 10 - 20 mins) but it
eventually crahes in glDrawArrays. I intend to try to come up with small code
for reproduction if time permits but I'll attach the stack trace from the app
for now in a hope someone can figure out what's going wrong.

(gdb) core glDrawArrays.core
warning: core file may not match specified executable file.
[New LWP 14181]
[New LWP 14175]
[New LWP 14179]
[New LWP 14180]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `{app-name-hidden}'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  nvc0_resource_validate (flags=<optimized out>, res=<optimized out>)
    at ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_screen.h:156
156     ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_screen.h: No such
file or directory.
[Current thread is 1 (Thread 0x7fffee488700 (LWP 14181))]
(gdb) info threads
  Id   Target Id         Frame
* 1    Thread 0x7fffee488700 (LWP 14181) nvc0_resource_validate
(flags=<optimized out>,
    res=<optimized out>)
    at ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_screen.h:156
  2    Thread 0x7ffff7fd2740 (LWP 14175) 0x00007ffff741798d in recvmsg ()
    at ../sysdeps/unix/syscall-template.S:84
  3    Thread 0x7fffef48a700 (LWP 14179) 0x00007ffff6684687 in ioctl ()
    at ../sysdeps/unix/syscall-template.S:84
  4    Thread 0x7fffeec89700 (LWP 14180) 0x00007ffff7416867 in
futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0,
futex_word=0x611838 <gPboFifo+344>)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
(gdb) where
#0  nvc0_resource_validate (flags=<optimized out>, res=<optimized out>)
    at ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_screen.h:156
#1  nvc0_bufctx_fence (nvc0=nvc0 at entry=0x7842c0, bufctx=<optimized out>,
    on_flush=on_flush at entry=true)
    at ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_context.c:434
#2  0x00007ffff38b69c3 in nvc0_state_validate (nvc0=nvc0 at entry=0x7842c0,
    mask=mask at entry=4294967295)
    at
../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c:760
#3  0x00007ffff38c1dcd in nvc0_draw_vbo (pipe=0x7842c0, info=0x7fffee487890)
    at ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c:972
#4  0x00007ffff3572e77 in st_draw_vbo (ctx=0x7ae730, prims=<optimized out>,
nr_prims=1,
    ib=0x0, index_bounds_valid=<optimized out>, min_index=0, max_index=3,
    tfb_vertcount=0x0, stream=0, indirect=0x0)
    at ../../../src/mesa/state_tracker/st_draw.c:288
#5  0x00007ffff353994a in vbo_draw_arrays (ctx=0x7ae730, mode=6, start=0,
count=4,
    numInstances=1, baseInstance=0) at
../../../src/mesa/vbo/vbo_exec_array.c:497
#6  0x0000000000404e8b in renderToWindow (target=4) at main.cpp:825
#7  0x0000000000405efd in RenderThread (pArg=0x7fffffffe140) at main.cpp:1105
#8  0x00007ffff740e6fa in start_thread (arg=0x7fffee488700) at
pthread_create.c:333
#9  0x00007ffff668eb5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
(gdb) p res
$1 = <optimized out>
(gdb) up
#1  nvc0_bufctx_fence (nvc0=nvc0 at entry=0x7842c0, bufctx=<optimized out>,
    on_flush=on_flush at entry=true)
    at ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_context.c:434
434     ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_context.c: No such
file or directory.
(gdb) p res
$2 = (struct nv04_resource *) 0xfa
(gdb) p ref
$3 = (struct nouveau_bufref *) 0x786f18
(gdb) p ref->priv
$4 = (void *) 0xfa
(gdb)

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