On Tue, Mar 29, 2022 at 06:12:28PM +0800, Baoquan He wrote: > Redhat CKI reported kdump kernel will hang a while very early after crash > triggered, then reset to firmware to reboot. > > This failure can only be observed with kdump or kexec reboot via > kexec_load system call. With kexec_file_load interface, both kdump and > kexec reboot work very well. And further investigation shows that gcc > version 11 doesn't have this issue, while gcc version 12 does. > > After checking the release notes of the latest gcc, Dave found out it's > because gcc 12 enables auto-vectorization for -O2 optimization level. > Please see below link for more information: > > https://www.phoronix.com/scan.php?page=news_item&px=GCC-12-Auto-Vec-O2 > > Adding -fno-tree-vectorize to Makefile of purgatory can fix the issue. > > Signed-off-by: Baoquan He <bhe@xxxxxxxxxx> Thanks, applied. _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
