Hi again,
On 15.09.23 13:47, Frank Scheiner wrote:
Hi Adrian,
On 06.08.23 10:44, John Paul Adrian Glaubitz wrote:
Hello!
The following important packages are broken on ia64:
- grub (git master) does not boot on ia64, crashes when loading stage2
(https://lists.gnu.org/archive/html/grub-devel/2023-07/msg00106.html)
- kernel FTBFS with gcc-13
(https://buildd.debian.org/status/fetch.php?pkg=linux&arch=ia64&ver=6.4.4-2&stamp=1690708282&raw=0)
I created a bug report for this, see [1]. In short this happens (1) also
for cross-compilation on amd64 (most likely also for other
cross-compilation host arches), (2) for me always for the same file
(`net/ipv4/fib_semantics.c`) and function ("fib_create_info()"), but
there are others, too, see buildd link, (3) for different kernel
versions and (3) is gone when providing `-fsanitize=undefined` during
compilation.
Details in [1].
[1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111425
I hope someone picks that up.
Richard Biener suggested `-fno-var-tracking` or `-g0` as workaround and
both indeed workaround the problem (see [2]). I don't yet know how to
limit the addition of `-fno-var-tracking` to KBUILD_CFLAGS to
`net/ipv4/fib_semantics.c` but the following patch:
```
root@dl380-g7:/usr/src# cat workaround-for-gcc-13.patch
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index b18ba8ef93ad..38f8586ebcc6 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -3,6 +3,8 @@
# Makefile for the Linux TCP/IP (INET) layer.
#
+KBUILD_CFLAGS += -fno-var-tracking
+
obj-y := route.o inetpeer.o protocol.o \
ip_input.o ip_fragment.o ip_forward.o ip_options.o \
ip_output.o ip_sockglue.o inet_hashtables.o \
```
...makes compilation work for the used kernel configuration ([3]):
```
root@dl380-g7:/usr/src# time ./make-kernel.bash
rx2620-rx2660-rx2800-i2-combined-localmodconfig ia64
linux-on-ramdisk/torvalds-linux/ w-gcc13
[...]
Making kernel...
time make -j24
LOCALVERSION="-ce9ecca0238b140b88f43859b211c9fdfd8e5b70-ia64-w-gcc13"
ARCH=ia64 CROSS_COMPILE=ia64-linux- all
[...]
CC security/integrity/ima/ima_fs.o
CC net/ipv4/fib_semantics.o
CC security/integrity/ima/ima_queue.o
[...]
No errors detected in 26726 functions.
real 3m41.183s
user 69m23.751s
sys 6m57.374s
0
[...]
done
Build artifacts:
/boot/vmlinux-6.6.0-rc2-ce9ecca0238b140b88f43859b211c9fdfd8e5b70-ia64-w-gcc13
/boot/vmlinuz-6.6.0-rc2-ce9ecca0238b140b88f43859b211c9fdfd8e5b70-ia64-w-gcc13
/boot/config-6.6.0-rc2-ce9ecca0238b140b88f43859b211c9fdfd8e5b70-ia64-w-gcc13
/lib/modules/6.6.0-rc2-ce9ecca0238b140b88f43859b211c9fdfd8e5b70-ia64-w-gcc13.tar
real 3m57.203s
user 69m28.325s
sys 6m59.414s
```
Looking into the buildd link above this also needs to be applied for
`/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c` if it is indeed the
same problem.
[2]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111425#c5
[3]: https://gcc.gnu.org/bugzilla/attachment.cgi?id=55904
The resulting kernel and modules aren't yet tested, though. I plan that
for today and tomorrow.
Cheers,
Frank
