Date: Fri, 30 Aug 2019 09:07:16 -0700 From: Navdeep Parhar <nparhar@gmail.com> To: shreyank amartya <shreyankfbsd@gmail.com>, freebsd-drivers@freebsd.org Cc: freebsd-hackers@freebsd.org Subject: Re: hwpmc ktrdump: failed to resolve ktr symbols Message-ID: <0534e1a9-af57-96cf-9ea2-ec4b30021226@gmail.com> In-Reply-To: <CAD9jf8BXm2PgY=5DkKxrweuG4x-QEERhJyPTESCkxt_Bi84E9Q@mail.gmail.com> References: <CAD9jf8BXm2PgY=5DkKxrweuG4x-QEERhJyPTESCkxt_Bi84E9Q@mail.gmail.com>
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On 2019-08-30 03:54, shreyank amartya wrote: > Hi, > > I'm trying to collect traces from hwpmc module. I compiled the module with > -DHWPMC_DEBUG option and set the sysctl kern.hwpmc.debugflags but I'm > unable to retrive the traces using ktrdump. I get this error message: > > ktrdump: failed to resolve ktr symbols > > I'm guessing that this error occurs because the symbols for hwpmc module > (compiled and loaded separately) are not a part of kernel. If this is the > case, then how do I get those symbols. In the ktr man page its also > mentioned that ddb and gdb can retrieve ktraces. > > I found the ddb command show ktr. But how do I invoke ddb (without a panic)? sysctl debug.kdb.enter=1 > > I'm unable to find how can I use gdb to view the traces (I launched kgdb > but could not find a command to show kernel traces). > > Any idea on how to get ktrdump working? Or get the kernel traces. You need a kernel with KTR support. See ktr(4) for a full list of the options and other details. See "sysctl kern.conftxt" for what's in your running kernel. Regards, Navdeep
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