Messages in this thread | | | Date | Tue, 20 Mar 2012 18:17:51 +0200 | Subject | Re: memcpy() crash on x86-64 (reproducible) | From | Paulius Zaleckas <> |
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On Mon, Mar 19, 2012 at 11:42 AM, Paulius Zaleckas <paulius.zaleckas@gmail.com> wrote: > When dumping registers with 'ethtool -d <interface>' my PC freezes > (99% reproducible). > Only hard reset helps. My network card uses r8169 driver. > It uses memcpy_fromio() to copy PCI space registers to buffer. > If I change it to simple for(...) cycle with readl() it does NOT crash > and works as expected. > > This happens with my work PC and the same happens on my colleagues > identical PC with CPU: > Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz > > However this crash does not happen on my home PC with AMD Phenom CPU. > It also has realtek network card and uses the same r8169 driver. > > I know how to compile :) and I am willing to help find and fix this bug.
I have tried different versions of memcpy available in kernel: __memcpy() - crashes memcpy_c() - crashes memcpy_c_e() - works as expected __inline_memcpy() - works as expected
About crash: actually PC freezes for ~20s, then unfreezes, but responds very slowly and after ~1min freezes completely. One time I was able to see dmesg output and there was backtrace about some process stuck for too long and then it switched to some different timing source because hpet was unstable.
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