<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - Potential crash bug in src/gallium/auxiliary/rtasm/rtasm_execmem.c" href="https://bugs.freedesktop.org/show_bug.cgi?id=73473#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - Potential crash bug in src/gallium/auxiliary/rtasm/rtasm_execmem.c" href="https://bugs.freedesktop.org/show_bug.cgi?id=73473">bug 73473</a> from <a class="email" href="mailto:jaak@ristioja.ee" title="Jaak Ristioja <jaak@ristioja.ee>"> Jaak Ristioja</a> <pre>(In reply to <a href="show_bug.cgi?id=73473#c1">comment #1</a>) > If you're getting consistent crashes in glxgears I would recommend using gdb > to get a backtrace of the problem. I wish I could but gdb only shows ?? in backtrace: (gdb) thread apply all bt full Thread 1 (process 2782): #0 0x00006a0a172d4901 in ?? () No symbol table info available. #1 0x0000000000000000 in ?? () No symbol table info available. > With that said, I suspect that the problems is elsewhere for a few reasons > * There are more than a handful cases when mmap fails and I have yet to > notice after 3+ years constant use of nouveau any glxgears segfaults. > * I would suspect other mesa users will be affected and this problem would > be well know/resolved by now. > > Apart from the backtrace would you mind attaching your dmesg output after > the problem/segfault ? [17407.732321] grsec: From 5.4.2.83: denied RWX mmap of <anonymous mapping> by /usr/bin/glxgears[glxgears:2866] uid/euid:1000/1000 gid/egid:100/100, parent /bin/bash[bash:2860] uid/euid:1000/1000 gid/egid:100/100 [17407.732328] glxgears[2866]: segfault at ffffffffffffffff ip 0000685b13c99901 sp 000077a968f66e50 error 7 in nouveau_dri.so[685b1381f000+136c000] [17407.732342] grsec: From 5.4.2.83: Segmentation fault occurred at ffffffffffffffff in /usr/bin/glxgears[glxgears:2866] uid/euid:1000/1000 gid/egid:100/100, parent /bin/bash[bash:2860] uid/euid:1000/1000 gid/egid:100/100 [17407.732356] grsec: From 5.4.2.83: denied resource overstep by requesting 4096 for RLIMIT_CORE against limit 0 for /usr/bin/glxgears[glxgears:2866] uid/euid:1000/1000 gid/egid:100/100, parent /bin/bash[bash:2860] uid/euid:1000/1000 gid/egid:100/100 So it appears to try to read memory at ffffffffffffffff (i.e. -1 alias MAP_FAILED). It doesn't matter why mmap fails (EPERM). What matters is that it is documented that it may fail, but errors do not appear to be handled in code. I don't think Gentoo should be expected to mark every single application using OpenGL to be allowed mmap RWX memory. I use Intel + OpenGL on my Gentoo Hardened laptop with no problems. > Can you reproduce with the swrast driver ? > $ LIBGL_ALWAYS_SOFTWARE=1 glxgears $ DISPLAY=:0.0 LIBGL_ALWAYS_SOFTWARE=1 glxgears; echo $? LLVM ERROR: Allocation failed when allocating new memory in the JIT Can't allocate RWX Memory: Operation not permitted 1 I'm using Hardened Gentoo (kernel is vanilla-3.12.6 + genpatches-3.12-7 + grsecurity-3.0-3.12.6-201401021726; gcc --version is "gcc (Gentoo Hardened 4.7.3-r1 p1.4, pie-0.5.5) 4.7.3").</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>