* Re: 2.3.42: Strange memory corruption [not found] <20000202051433.A298@tony.dorf.wh.uni-dortmund.de> @ 2000-02-02 13:41 ` Rik van Riel 2000-02-02 17:43 ` Manfred Spraul 0 siblings, 1 reply; 2+ messages in thread From: Rik van Riel @ 2000-02-02 13:41 UTC (permalink / raw) To: Patrick Mau; +Cc: Linux Kernel, Linux MM On Wed, 2 Feb 2000, Patrick Mau wrote: > I have a really strange memory corruption problem with > 2.3.42. My system configuration is as follows: > After a few md5sums I get different checksums. > Now I check the file with bzip2 and get a CRC error. > > Now I make a copy (plain 'cp') of that file. > > Then I repeat the above with the copy and get different > checksums and also CRC errors from bzip2. (I expected that). > > --> Here comes the strange part <--- > > Now I reboot into 2.3.30. Same config. > And BOTH files, even the 'corrupt' copy, are > correct. I can run the md5sum test AND can uncompress > BOTH of them. I can always reproduce that. This looks a bit like there might be a race with the pagetable mapping or read()ing of the file. It would explain the three `suspicious' segfaults I've seen in the last few days... regards, Rik -- The Internet is not a network of computers. It is a network of people. That is its real strength. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/ ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: 2.3.42: Strange memory corruption 2000-02-02 13:41 ` 2.3.42: Strange memory corruption Rik van Riel @ 2000-02-02 17:43 ` Manfred Spraul 0 siblings, 0 replies; 2+ messages in thread From: Manfred Spraul @ 2000-02-02 17:43 UTC (permalink / raw) To: Rik van Riel; +Cc: Patrick Mau, Linux Kernel, Linux MM Rik van Riel wrote: > > This looks a bit like there might be a race with the > pagetable mapping or read()ing of the file. It would > explain the three `suspicious' segfaults I've seen in > the last few days... > The TLB flush code contains various races if IPI's are sent between switch_mm() and switch_to(). I and Ingo have written patches that fix these problems, and we are waiting for Linus' reply. I've posted my patch and a longer description to linux-kernel last Friday "[PATCH] new tlb flush code". -- Manfred -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/ ^ permalink raw reply [flat|nested] 2+ messages in thread
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2000-02-02 13:41 ` 2.3.42: Strange memory corruption Rik van Riel
2000-02-02 17:43 ` Manfred Spraul
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