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On Thursday 22 March 2007 01:11:57 Jan Engelhardt wrote: > > On Mar 21 2007 23:58, Eric Dumazet wrote: > > Hi all > > > > On i386 , 2.6.20 / 2.6.21-rc4 : > > > > # gdb vmlinux /proc/kcore > > error > > # file /proc/kcore > > error > > 00:11 ichi:/hld # file /proc/kcore > /proc/kcore: ELF 32-bit LSB core file Intel 80386, version 1 (SYSV), > SVR4-style, from 'vmlinux' > 00:11 ichi:/hld # hexdump -C /proc/kcore | head -n5 > 00000000 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 |.ELF............| > 00000010 04 00 03 00 01 00 00 00 00 00 00 00 34 00 00 00 |............4...| > 00000020 00 00 00 00 00 00 00 00 34 00 20 00 03 00 00 00 |........4. .....| > 00000030 00 00 00 00 04 00 00 00 94 00 00 00 00 00 00 00 |................| > 00000040 00 00 00 00 a8 06 00 00 00 00 00 00 00 00 00 00 |................| > 00:11 ichi:/hld # uname -rm > 2.6.20.2 i686 > > > > > > > Apparently we can not llseek() anymore on this file (returns -EINVAL) > > > > On x86_64 2.6.20 it's working > > > > # file /proc/kcore > > /proc/kcore: ELF 64-bit LSB core file x86-64, version 1 (SYSV), SVR4-style > > > > > > On i386 2.6.14 it's working too. > > > > Eric > > - > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > > > > > > Jan Hello, I once had similar problem with /proc/kcore then gdb showed all zeros for all kernel memory, I had look at code , and I found that "Sparse memory model" was the problem, it doesn't say where kernel memory is (I don't remember details now) I once choosed it just for experiment, so I switched to Flat memory, and /proc/kcore works fine till then, I use 32 bit x86 kernel. Regards, Maxim Levitsky - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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