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17 May 2024, 11:00:25 UTC
Revision 030a976efae83f7b6593afb11a8254d42f9290fe authored by Peter Zijlstra on 19 November 2022, 02:45:54 UTC, committed by Peter Zijlstra on 24 November 2022, 09:12:23 UTC 
perf: Consider OS filter fail
 
Some PMUs (notably the traditional hardware kind) have boundary issues
with the OS filter. Specifically, it is possible for
perf_event_attr::exclude_kernel=1 events to trigger in-kernel due to
SKID or errata.

This can upset the sigtrap logic some and trigger the WARN.

However, if this invalid sample is the first we must not loose the
SIGTRAP, OTOH if it is the second, it must not override the
pending_addr with a (possibly) invalid one.

Fixes: ca6c21327c6a ("perf: Fix missing SIGTRAPs")
Reported-by: Pengfei Xu <pengfei.xu@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: Pengfei Xu <pengfei.xu@intel.com>
Link: https://lkml.kernel.org/r/Y3hDYiXwRnJr8RYG@xpf.sh.intel.com
1 parent af169b7
Raw File
Tip revision: 030a976efae83f7b6593afb11a8254d42f9290fe authored by Peter Zijlstra on 19 November 2022, 02:45:54 UTC
perf: Consider OS filter fail
Tip revision: 030a976
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