Date: Sun, 21 Oct 2012 18:40:08 -0700 From: Tim Kientzle <kientzle@freebsd.org> To: arm@freebsd.org Subject: Trashed registers returning from kernel? Message-ID: <2B1CF099-50F0-46BE-8B02-61309DF93D5F@freebsd.org>
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On the BeagleBone, I'm seeing a similar crash in several different user land programs. I suspect it's a kernel bug. Symptom: program is killed with SIGSEGV. Most of the registers contain values above 0xc0000000 (pointing into kernel space). Theory: * Registers are not always getting correctly restored on a kernel->user transition. * SEGV is a consequence. I can reproduce it semi-consistently by running "emacs existing-file" just after a reboot. (But I'm pretty sure this is the same symptoms I've seen with several other programs, so I don't think it's a bug in emacs.) Has anyone else seen this on an armv6 system? Does anyone have suggestions for how to go about debugging this? Suggestions appreciated. Cheers, Timhome | help
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