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authorAndrew Turner <andrew@FreeBSD.org>2016-05-28 13:05:39 +0000
committerAndrew Turner <andrew@FreeBSD.org>2016-05-28 13:05:39 +0000
commit7bc7e3cd65d0b399c04578b46ca7e0536e09b45e (patch)
tree6ae0da9974e37e213b350595dc71c70b6aefa396 /sbin/md5/md5.1
parentc169d9fe07ad2ad1767ccc9725a0dc9eef052175 (diff)
downloadsrc-7bc7e3cd65d0b399c04578b46ca7e0536e09b45e.tar.gz
src-7bc7e3cd65d0b399c04578b46ca7e0536e09b45e.zip
Don't panic in hwpmc when stopping sampling.
When hwpmc stops sampling it will set the pm_state to something other than PMC_STATE_RUNNING. This means the following sequence can happen: CPU 0: Enter the interrupt handler CPU 0: Set the thread TDP_CALLCHAIN pflag CPU 1: Stop sampling CPU 0: Call pmc_process_samples, sampling is stopped so clears ps_nsamples CPU 0: Finishes interrupt processing with the TDP_CALLCHAIN flag set CPU 0: Call pmc_capture_user_callchain to capture the user call chain CPU 0: Find all the pmc sample are free so no call chains need to be captured CPU 0: KASSERT because of this This fixes the issue by checking if any of the samples have been stopped and including this in te KASSERT. PR: 204273 Reviewed by: bz, gnn Obtained from: ABT Systems Ltd Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D6581
Notes
Notes: svn path=/head/; revision=300902
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