Date: Mon, 25 Sep 2017 10:48:12 +0300 From: "Andriy Voskoboinyk" <s3erios@gmail.com> To: "Farhan Khan" <khanzf@gmail.com> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Debugging symbols on kernel module Message-ID: <op.y632mmqxiew4ia@thinkpad-x220> In-Reply-To: <e2def9e8-4356-2699-b127-e5e93ac11319@gmail.com> References: <e2def9e8-4356-2699-b127-e5e93ac11319@gmail.com>
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Hi, for debugging purposes I'm adding next line in make.conf: CFLAGS+= -O0 -g Works for modules but not for the kernel (KSTACK_PAGES needs to be increased for the whole kernel build). > Hi all, > > I am working on a kernel module but am getting some unexpected code > execution. Dtrace probes reveal that the kernel executes: > "rtwn.ko`r88ee_init_bb+0x219" and then jumps to an unexpected function. > > I would like to track down exactly which line that is. I compiled the > module with this: > > # make DEBUG_FLAGS=-g3 -C sys/modules/rtwn/ > > This produced the rtwn.ko.debug and rtwn.ko.full files. But when I load > them, I still do not have debugging symbols: > > $ kgdb rtwn.ko > GNU gdb (GDB) 8.0 [GDB v8.0 for FreeBSD] > Copyright (C) 2017 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later > <http://gnu.org/licenses/gpl.html>; > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. Type "show > copying" > and "show warranty" for details. > This GDB was configured as "x86_64-portbld-freebsd12.0". > Type "show configuration" for configuration details. > For bug reporting instructions, please see: > <http://www.gnu.org/software/gdb/bugs/>. > Find the GDB manual and other documentation resources online at: > <http://www.gnu.org/software/gdb/documentation/>. > For help, type "help". > Type "apropos word" to search for commands related to "word"... > Reading symbols from rtwn.ko...Reading symbols from > /usr/src/sys/modules/rtwn/rtwn.ko.debug...(no debugging symbols > found)...done. > (no debugging symbols found)...done. > (kgdb) file rtwn.ko.debug > Reading symbols from rtwn.ko.debug...(no debugging symbols found)...done. > (kgdb) file rtwn.ko.full > Reading symbols from rtwn.ko.full...(no debugging symbols found)...done. > > How do I properly load debugging symbols for the module? > > Thanks, > > Farhan Khan > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to > "freebsd-hackers-unsubscribe@freebsd.org"
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