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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - nvc0 occasionally crashes in glDrawArrays in a multi-threaded app"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97537">97537</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>nvc0 occasionally crashes in glDrawArrays in a multi-threaded app
</td>
</tr>
<tr>
<th>Product</th>
<td>Mesa
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>Drivers/DRI/nouveau
</td>
</tr>
<tr>
<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>shinji.suzuki@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>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@entry=0x7842c0, bufctx=<optimized out>,
on_flush=on_flush@entry=true)
at ../../../../../src/gallium/drivers/nouveau/nvc0/nvc0_context.c:434
#2 0x00007ffff38b69c3 in nvc0_state_validate (nvc0=nvc0@entry=0x7842c0,
mask=mask@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@entry=0x7842c0, bufctx=<optimized out>,
on_flush=on_flush@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)</pre>
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