Date: Mon, 25 Sep 2017 21:00:38 -0400 From: Farhan Khan <khanzf@gmail.com> To: Andriy Voskoboinyk <s3erios@gmail.com> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Debugging symbols on kernel module Message-ID: <64eca59f-f937-cb8e-0a45-0ea8abcf2411@gmail.com> In-Reply-To: <op.y632mmqxiew4ia@thinkpad-x220> References: <e2def9e8-4356-2699-b127-e5e93ac11319@gmail.com> <op.y632mmqxiew4ia@thinkpad-x220>
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As suggested, I set my /etc/make.conf to this: CFLAGS+= -O0 -g DEBUG_FLAGS+= -g3 And it worked. Thank you, Andriy! On 09/25/2017 03:48 AM, Andriy Voskoboinyk wrote: > 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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