Hi, This is an attempt to solve the first problem that I talked in the previous patchset. 1. register_uprobe/unregister_uprobe may cause deadlock
Currently if uprobes engine were in the midst of singlestepping a breakpoint, it wouldnt allow register/unregister of probes to continue until the singlestep operation completes. However tracing thread that could be registering/unregistering a probe could have already requested the thread that was in the midst of singlestepping to STOP. This leads to a deadlock, - register/unregistering thread waits for reg/unreg to complete before resuming the thread - singlestepping thread waiting for it to be resumed and complete singlestepping before it could quiesce and allow register/unregister to complete. This patch tries to fix this problem by using the existing defer_registration. Once we defer the request, the registering thread would then resume the singlestepping thread which would pick up the deferred registration. Subject: [PATCH 0/2] Fixes to gdbstub. File: /tmp/gdbstub-patches/2/intro Subject: [PATCH 1/2] Defer register/unregister if thread is stopped. File: /tmp/gdbstub-patches/2/uc_make_defer_un_register_uprobe.patch Subject: [PATCH 2/2] Allow deferred register/unregister of uprobes. File: /tmp/gdbstub-patches/2/gs_use_deferred_register_uprobe.patch -- Thanks and Regards Srikar Dronamraju
