Messages in this thread | | | Date | Sat, 17 Jul 1999 13:19:20 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: gdb strangness Under 2.3.11-pre1 |
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On Tue, 13 Jul 1999, Jeremy Katz wrote:
> Doing some development and using gdb to try to debug seems to be causing > some sort of kernel problem under 2.3.11-pre1. When tracing a running > process, I get to the point where attempting to execute any command yields > the following. > Trace/breakpoint trap (core dumped)
yes this bug was introduced by the 'many threads' changes in pre-2.3.11. The changes are a rather massive rewrite all across x86-land [we got rid of the one-TSS-one-thread limitation] - i tried to fix all bugs, but i think this gdb thing remained unfixed. My best guess right now is that %db7 is being handled incorrectly somehow - although i cannot see how.
other things that might pop up:
- possible LDT related bugs - Wine people please watch out. - ptrace/strace related bugs - possible vm86 related bugs - i tested this rather extensively though.
[there is another x86 change that went in as well recently with pre-2.3.11, the 'lazy TLB flush feature' which was planned for quite some time already - bug the gdb bug predates the lazy-TLB-flush changes. The lazy-TLB feature lets us cut down on the number of TLB flushes rather heavily, in a typical x86 Linux box about 80-90% of TLB flushes are now gone.]
-- mingo
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