On Tue, 30 Jul 2019, Andreas Schwab wrote:

> On Jul 30 2019, David Abdurachmanov <david.abdurachmanov@gmail.com> wrote:
> 
> > On Mon, Jul 29, 2019 at 1:51 PM Andreas Schwab <schwab@suse.de> wrote:
> >>
> >> Since switching to 5.2 kernels I'm seeing random crashes and
> >> misbehaviors on the HiFive, for example while building gcc or glibc.
> >> Perhaps missing TLB flushes?
> >
> > Do you have some examples of crashes?
> 
> While building glibc:
> 
> an_ES.UTF-8...realloc(): invalid pointer
> /bin/sh: line 1:  7841 Aborted                 (core dumped) I18NPATH=. GCONV_PATH=/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/iconvdata LC_ALL=C /home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/elf/ld-linux-riscv64-lp64d.so.1 --library-path /home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/math:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/elf:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/dlfcn:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/nss:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/nis:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/rt:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/resolv:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/mathvec:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/support:/home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/nptl /home/abuild/rpmbuild/BUILD/glibc-2.29/cc-base/locale/localedef $flags --alias-file=../intl/locale.alias -i locales/$input -f charmaps/$charset --prefix=/home/abuild/rpmbuild/BUILDROOT/glibc-2.29-0.riscv64 $locale
> make[2]: *** [Makefile:422: install-archive-an_ES.UTF-8/UTF-8] Error 134
> 
> While building gcc:
> 
> ../../gcc/ada/exp_aggr.adb: In function 'Exp_Aggr.Expand_N_Aggregate':
> ../../gcc/ada/exp_aggr.adb:5311:21: warning: 'Csiz' may be used uninitialized in this function [-Wmaybe-uninitialized]
> ../../gcc/ada/exp_aggr.adb:5220:10: note: 'Csiz' was declared here
> +===========================GNAT BUG DETECTED==============================+
> | 10.0.0 20190727 (experimental) [trunk revision 273844] (riscv64-suse-linux) |
> | Storage_Error stack overflow or erroneous memory access                  |
> | Error detected at output.ads:39:8                                        |
> realloc(): invalid pointer

I personally haven't seen these issues; but then again, I haven't done any 
glibc or gcc builds on v5.2.  Will take a closer look.

Reflecting on the recent commits, there weren't too many recent 
RISC-V-specific changes that could have an impact here.  So if these 
problems are relatively repeatable, and they didn't happen with v5.1, 
there are a few patches that might be worth reverting to see if the 
situation improves.  Here would be my short list:

- Commit bf587caae305ae3b4393077fb22c98478ee55755 ("riscv: mm: synchronize 
MMU after pte change") 

- Commit 6dd91e0eacff0a5c822ca37565d6b5740c4d2a80 ("RISC-V: defconfig: 
Enable NO_HZ_IDLE and HIGH_RES_TIMERS")

- Commit 671f9a3e2e24cdeb2d2856abee7422f093e23e29 ("RISC-V: Setup initial 
page tables in two stages")

Of course, it's also possible that someone could have made a change 
outside arch/riscv that are causing these problems.  If that's the case, 
we're probably stuck bisecting it.


- Paul