Re: Bug#1002690: clutter-1.0: unit tests fail on mips64el: segmentation fault in an llvmpipe thread with swrast_dri.so driver

2021-12-27 Thread Simon McVittie 
On Mon, 27 Dec 2021 at 14:36:01 +, Simon McVittie wrote:
> I'm now trying to build 1.26.4+dfsg-2 on eller to see whether this is a
> regression in some other package - I suspect it was, since clutter-1.0
> has had no code changes since 2020, but it would be good to be more sure
> of this.

Yes, I think this is a regression in some other component, probably Mesa
or LLVM. 1.26.4+dfsg-2 passed unit tests on the buildds, but when rebuilt
on eller with current versions, it fails the same 5 tests as 1.26.4+dfsg-3
(although the failure is ignored by the d/rules from 1.26.4+dfsg-2).

smcv

Re: Bug#1002690: clutter-1.0: unit tests fail on mips64el: segmentation fault in an llvmpipe thread with swrast_dri.so driver

2021-12-27 Thread Simon McVittie 
Control: user debian-m...@lists.debian.org
Control: usertags -1 + mips64el

On Mon, 27 Dec 2021 at 14:26:56 +, Simon McVittie wrote:
> The clutter-1.0 unit tests fail on mips64el with segmentation faults in
> actor-anchors, actor-layout, actor-offscreen-redirect, actor-pick and
> texture.
> 
> This (or at least a similar crash) is reproducible in a sid mips64el
> chroot on eller, and can be reproduced in the built tree with a command
> like:
> 
> dbus-run-session -- xvfb-run -a ./libtool --mode=execute gdb 
> ./tests/conform/texture

This might be related to https://bugs.debian.org/935884 and/or
https://bugs.debian.org/868745, which are other mips-specific crashes
involving llvmpipe.

I'm now trying to build 1.26.4+dfsg-2 on eller to see whether this is a
regression in some other package - I suspect it was, since clutter-1.0
has had no code changes since 2020, but it would be good to be more sure
of this.

smcv

Bug#1002690: clutter-1.0: unit tests fail on mips64el: segmentation fault in an llvmpipe thread with swrast_dri.so driver

2021-12-27 Thread Simon McVittie 
Source: clutter-1.0
Version: 1.26.4+dfsg-3
Severity: important
Tags: ftbfs
X-Debbugs-Cc: debian-m...@lists.debian.org, m...@packages.debian.org

The clutter-1.0 unit tests fail on mips64el with segmentation faults in
actor-anchors, actor-layout, actor-offscreen-redirect, actor-pick and
texture.

This (or at least a similar crash) is reproducible in a sid mips64el
chroot on eller, and can be reproduced in the built tree with a command
like:

dbus-run-session -- xvfb-run -a ./libtool --mode=execute gdb 
./tests/conform/texture

By installing libgl1-mesa-dri-dbgsym on eller, I was able to get the
backtrace below. This might indicate that this is actually a Mesa bug,
I don't know.

Before version 1.26.4+dfsg-3, the result of clutter-1.0 unit tests was
ignored on mips*el. For now I'm going to resume ignoring the failed result:
I suspect that Mesa and Clutter have few or no users on mips*.

Clutter is essentially unmaintained upstream (see #996690) so if it needs
anything architecture-specific, that will have to come from architecture
porters, and is vanishingly unlikely to come from upstream.

smcv

Thread 10 (Thread 0xffe17f9e50 (LWP 25902) "texture:disk$0"):
#0  0x00fff6f813bc in __futex_abstimed_wait_common64 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#1  0x00fff6f8 in pthread_cond_wait@@GLIBC_2.3.2 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#2  0x00fff4c20e44 in cnd_wait (mtx=0xb30ba8, cond=0xb30bd0) at 
../include/c11/threads_posix.h:155
#3  util_queue_thread_func (input=) at ../src/util/u_queue.c:294
#4  0x00fff4c206e0 in impl_thrd_routine (p=) at 
../include/c11/threads_posix.h:87
#5  0x00fff6f6f24c in start_thread () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0

Thread 9 (Thread 0xffe1ffae50 (LWP 25901) "texture"):
#0  0x00fff6f813bc in __futex_abstimed_wait_common64 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#1  0x00fff6f8 in pthread_cond_wait@@GLIBC_2.3.2 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#2  0x00fff537102c in cnd_wait (mtx=0xb30250, cond=0xb30278) at 
../include/c11/threads_posix.h:155
#3  lp_cs_tpool_worker (data=0xb30250) at 
../src/gallium/drivers/llvmpipe/lp_cs_tpool.c:48
#4  0x00fff5370f80 in impl_thrd_routine (p=) at 
../include/c11/threads_posix.h:87
#5  0x00fff6f6f24c in start_thread () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0

Thread 8 (Thread 0xffe27fbe50 (LWP 25900) "texture"):
#0  0x00fff6f813bc in __futex_abstimed_wait_common64 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#1  0x00fff6f8 in pthread_cond_wait@@GLIBC_2.3.2 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#2  0x00fff537102c in cnd_wait (mtx=0xb30250, cond=0xb30278) at 
../include/c11/threads_posix.h:155
#3  lp_cs_tpool_worker (data=0xb30250) at 
../src/gallium/drivers/llvmpipe/lp_cs_tpool.c:48
#4  0x00fff5370f80 in impl_thrd_routine (p=) at 
../include/c11/threads_posix.h:87
#5  0x00fff6f6f24c in start_thread () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0

Thread 7 (Thread 0xffe2ffce50 (LWP 25899) "texture"):
#0  0x00fff6f813bc in __futex_abstimed_wait_common64 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#1  0x00fff6f8 in pthread_cond_wait@@GLIBC_2.3.2 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#2  0x00fff537102c in cnd_wait (mtx=0xb30250, cond=0xb30278) at 
../include/c11/threads_posix.h:155
#3  lp_cs_tpool_worker (data=0xb30250) at 
../src/gallium/drivers/llvmpipe/lp_cs_tpool.c:48
#4  0x00fff5370f80 in impl_thrd_routine (p=) at 
../include/c11/threads_posix.h:87
#5  0x00fff6f6f24c in start_thread () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0

Thread 6 (Thread 0xffe37fde50 (LWP 25898) "texture"):
#0  0x00fff6f813bc in __futex_abstimed_wait_common64 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#1  0x00fff6f8 in pthread_cond_wait@@GLIBC_2.3.2 () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#2  0x00fff537102c in cnd_wait (mtx=0xb30250, cond=0xb30278) at 
../include/c11/threads_posix.h:155
#3  lp_cs_tpool_worker (data=0xb30250) at 
../src/gallium/drivers/llvmpipe/lp_cs_tpool.c:48
#4  0x00fff5370f80 in impl_thrd_routine (p=) at 
../include/c11/threads_posix.h:87
#5  0x00fff6f6f24c in start_thread () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0

Thread 5 (Thread 0xffe3ffee50 (LWP 25897) "llvmpipe-3"):
#0  0x00fff6f79420 in pthread_barrier_wait () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0
#1  0x00fff5374944 in util_barrier_wait (barrier=0xb220a0) at 
../src/util/u_thread.h:301
#2  thread_function (init_data=0xb20e38) at 
../src/gallium/drivers/llvmpipe/lp_rast.c:887
#3  0x00fff5374350 in impl_thrd_routine (p=) at 
../include/c11/threads_posix.h:87
#4  0x00fff6f6f24c in start_thread () at 
/lib/mips64el-linux-gnuabi64/libpthread.so.0

Thread 4 (Thread 0xffe8f5ae50 (LWP 25896) "llvmpipe-2"):
#0  0x00fff6f79420