On Fri, Oct 13, 2017 at 8:54 AM, Dmitry Safonov <[email protected]> wrote: > Hi Tglx, Andy, > > Sorry for old-posting, > > 2017-09-15 8:09 GMT+01:00 Thomas Gleixner <[email protected]>: >> On Thu, 14 Sep 2017, Andy Lutomirski wrote: >>> On Thu, Sep 14, 2017 at 9:00 AM, Thomas Gleixner <[email protected]> wrote: >>> > On Thu, 14 Sep 2017, Andy Lutomirski wrote: >>> >> On Thu, Sep 14, 2017 at 12:38 AM, Thomas Gleixner <[email protected]> >>> >> wrote: >>> >> > Hi! >>> >> > >>> >> > I've seen the following crash sporadically with commit 46c1e79fee: >>> >> > >>> >> > Have not seen that with 3882a734c19b, though I saw the PCID warnings on >>> >> > that machine. >>> >> > >>> >> > I have no idea how to reproduce so bisecting is pretty much pointless. >>> >> > Any >>> >> > idea what to do? >>> >> >>> >> Does tools/testing/selftests/x86/sigreturn_64 reproduce it? >>> > >>> > Will try tomorrow once I figured out how to compile that stuff. Invoking a >>> > simple make in that directory fails. >>> >>> What's the error? It works for me. >> >> gcc -m64 -o >> /home/tglx/work/kernel/linus/linux/tools/testing/selftests/x86/sysret_ss_attrs_64 >> -O2 -g -std=gnu99 -pthread -Wall sysret_ss_attrs.c thunks.S -lrt -ldl >> /usr/bin/ld: /tmp/cco4vSkU.o: relocation R_X86_64_32S against `.text' can >> not be used when making a shared object; recompile with -fPIC >> /usr/bin/ld: final link failed: Nonrepresentable section on output >> collect2: error: ld returned 1 exit status > > Had the same issue in copied thunks.S helper to CRIU. > As I wanted to compile CRIU as pie also (which is the default now > in some distributions), I fixed it up by using %rip-relative addressing > and pushing segment descriptor to stack before long-jumping. > Not sure if that's the issue for the selftest as it can be just always > compiled as pic. > > Anyway, here is the commit if you want to look: > https://github.com/0x7f454c46/criu/commit/cf36ea5d8408bf1e42c3bd21b9594369ea7123fb
Thanks! The problem is that I need to have some text below 4 GB, and that's currently guaranteed by a non-PIE build. And I'm lazy :) > > -- > Dmitry
