On Thu, Apr 27, 2023 at 10:13 PM Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote: > > Zhouyi Zhou <zhouzhouyi@xxxxxxxxx> writes: > > On Thu, Apr 27, 2023 at 11:09 AM Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote: > >> > >> Zhouyi Zhou <zhouzhouyi@xxxxxxxxx> writes: > >> > On Tue, Apr 25, 2023 at 2:01 PM Zhouyi Zhou <zhouzhouyi@xxxxxxxxx> wrote: > >> >> On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote: > >> ... > >> >> > > >> >> > There's 12.2.0 here: > >> >> > https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/12.2.0/ > >> >> > https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/ppc64le/12.2.0/ > >> > >> > powerpc64le-linux-gnu-gcc-12 cross compiler on my Ubuntu 22.04 does > >> > not seem to have that issue as gcc-10 does > >> > >> OK. So so far it's only that GCC 10 that shows the problem. > >> > >> If you have time, you could use some of the other versions to narrow > >> down which versions show the bug: > >> > >> https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/ppc64le/ > >> > >> There's an 11.0, 11.1 and 11.3 there, as well as 9.5 and so on. > > GCC test results (Tested on PPC VM of Open Source Lab of Oregon State > > University) > > gcc 9.4 (ubuntu native): positive, show bug > > gcc 9.5 (download form [1]): positive, show bug > > gcc 10.1 (download from [1]): positive, show bug > > gcc 10.3 (download from [1]): positive, show bug > > gcc 10.4 (download from [1]): positive, show bug > > > > gcc 11.0 (download from [1]): negative, no bug > > gcc 11.1 (download from [1]): negative, no bug > > gcc 11.3 (download from [1]): negative, no bug > > gcc 12.1 (download from [1]): negative, no bug > > gcc 12.2 (download from [1]): negative, no bug > > Awesome work. Thank you for your encouragement ;-) ;-) > > How are you testing for presence/absence of the bug? By running your > test and seeing if it crashes, or by looking at the generated code? Both I use gdb ./vmlinux; gdb)disassemble srcu_gp_start_if_needed to look up the generated assembly code and I use [1] to see if it crashes, if there is a bug, it always crashes very quickly (within 3 minutes) [1] http://140.211.169.189/0425/whilebash.sh Cheers > > cheers
