On Wed, Jan 03, 2018 15:14:01 CET Greg Kroah-Hartman wrote: > On Wed, Jan 03, 2018 at 01:22:07PM +0100, Markus wrote: > > On Wed, Jan 03, 2018 at 12:19:41 CET Greg Kroah-Hartman wrote: > > > On Wed, Jan 03, 2018 at 11:49:08AM +0100, Markus wrote: > > > > Hello! > > > > > > > > ORC unwinder is enabled in stable for wider testing but still at least > > > > one > > > > bug is open: > > > > https://bugzilla.kernel.org/show_bug.cgi?id=197035 > > > > > > Random web links on mailing lists don't help much, please put the > > > information here in the email. > > > > Its not a random web link. Its the official kernel.org bugtracker. But > > nobody seems to be looking at it. > > Not all subsystems use bugzilla.kernel.org, sorry. Email is the > preferred way for almost all subsystems. > > > > > objtool will segfault because a NULL pointer is dereferenced. > > > > > > And how are you reproducing this? > > > > Just building the kernel with ORC enabled. > > (At least for me. Using framepointers compiles, enabling ORC again breaks > > it.) gcc 6.4.0 (In bug report others were tested as well.) > > elfutils 0.170 > > What else may be interesting? > > Have you tried gcc 7?
No I have no gcc 7 installed, yet. (In the bug report gcc 8.0.0 and gcc 5.4.0 were mentioned.) > What distro is this? Hopefully not hardened Gentoo? :) Just a normal gentoo. > > > > Is a NULL pointer sym valid? > > > > If a NULL pointer is invalid, it has to be checked why it is sometimes > > > > NULL. > > > > > > What .config is triggering this problem? > > > > See attachment. > > > > > And does this show up on 4.14.11, and 4.15-rc6? > > > > Both: yes. > > > > /tools/objtool/objtool orc generate --no-fp "arch/x86/kernel/irq.o" > > > > => segfault. > > Ugh, I can't duplicate here :( How about the previously attached irq.o? BR, Markus
