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author | Andrew Turner <andrew@FreeBSD.org> | 2016-05-28 13:05:39 +0000 |
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committer | Andrew Turner <andrew@FreeBSD.org> | 2016-05-28 13:05:39 +0000 |
commit | 7bc7e3cd65d0b399c04578b46ca7e0536e09b45e (patch) | |
tree | 6ae0da9974e37e213b350595dc71c70b6aefa396 /sbin/md5/Makefile | |
parent | c169d9fe07ad2ad1767ccc9725a0dc9eef052175 (diff) | |
download | src-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
Diffstat (limited to 'sbin/md5/Makefile')
0 files changed, 0 insertions, 0 deletions