Hi Will,
On 2016/1/5 0:55, Will Deacon wrote:
Hello,
On Thu, Dec 24, 2015 at 01:42:42AM +0000, Wang Nan wrote:
[SNIP]
The problem seems to be that we take the debug exception before the
breakpointed instruction has been executed and call perf_bp_event at
that moment, so when we single-step the faulting instruction we actually
step into the SIGIO handler and end up getting stuck.
Your fix doesn't really address this afaict, in that you don't (can't?)
handle:
* A longjmp out of a signal handler
* A watchpoint and a breakpoint that fire on the same instruction
* User-controlled single-step from a signal handler that enables a
breakpoint explicitly
* Nested signals
Please have a look at [1], which I improve test__bp_signal() to
check bullet 2 and 4 you mentioned above. Seems my fix is correct.
[1]
http://lkml.kernel.org/g/1451969880-14877-1-git-send-email-wangn...@huawei.com
Thank you.
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