On Thu, Feb 26, 2026 at 6:48 PM Ming Lei <[email protected]> wrote: > > Hi Changhui, > > Thanks for the report! > > Loop Caleb Sander Mateos in. > > Thanks, > > On Thu, Feb 26, 2026 at 6:37 PM Changhui Zhong <[email protected]> wrote: > > > > Hello, > > > > on the ppc64le arch, I hit the issue below with ublksrv on the latest > > linux-block/for-next, please help check it, and let me know if you > > need any info/test for it. Thanks. > > > > INFO: HEAD of cloned kernel > > commit 37a43fd770f3dcac8f72f3ea909b3e893e2385c9 > > Merge: 13cd9b41227a c1dfbd7e71b0 > > Author: Jens Axboe <[email protected]> > > Date: Wed Feb 25 08:37:06 2026 -0700 > > > > Merge branch 'for-7.1/block' into for-next > > > > * for-7.1/block: > > ublk: report BLK_SPLIT_INTERVAL_CAPABLE > > > > reproducer: > > compile and install https://github.com/ublk-org/ublksrv.git > > #echo 0 > /proc/sys/kernel/io_uring_disabled > > #modprobe ublk_drv > > #cd ublksrv > > #make test T=null > > #make test T=loop > > > > dmesg log： > > Feb 26 00:24:30 ibm-p9z-27-lp26 journal: running null/002 > > Feb 26 00:24:30 ibm-p9z-27-lp26 ublksrvd-0[57921]: start ublksrv io > > daemon ublksrvd-0 > > Feb 26 00:24:30 ibm-p9z-27-lp26 ublksrvd-0[57921]: tid 57923: ublk dev > > 0 queue 0 started > > Feb 26 00:24:30 ibm-p9z-27-lp26 ublksrvd-0[57921]: tid 57924: ublk dev > > 0 queue 1 started > > Feb 26 00:24:36 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083476.4882] platform-linux: do-add-ip6-address[2: > > fe80::8448:a3ff:fe51:f102]: failure 13 (Permission denied - ipv6: IPv6 > > is disabled on this device) > > Feb 26 00:24:36 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083476.4885] platform-linux: do-add-ip6-address[2: > > 2620:52:9:160c:8448:a3ff:fe51:f102]: failure 13 (Permission denied - > > ipv6: IPv6 is disabled on this device) > > Feb 26 00:24:36 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083476.4938] l3cfg[0f1985ec14299e62,ifindex=2]: unable to > > configure IPv6 route: type unicast fe80::/64 dev 2 metric 1024 mss 0 > > rt-src ipv6ll > > Feb 26 00:24:38 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083478.4938] ipv6ll[95ab7f3fdbfe643d,ifindex=2]: changed: no IPv6 > > link local address to retry after Duplicate Address Detection failures > > (back off) > > Feb 26 00:24:38 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083478.4943] platform-linux: do-add-ip6-address[2: > > 2620:52:9:160c:8448:a3ff:fe51:f102]: failure 13 (Permission denied - > > ipv6: IPv6 is disabled on this device) > > Feb 26 00:24:48 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083488.5034] platform-linux: do-add-ip6-address[2: > > fe80::8448:a3ff:fe51:f102]: failure 13 (Permission denied - ipv6: IPv6 > > is disabled on this device) > > Feb 26 00:24:48 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083488.5037] platform-linux: do-add-ip6-address[2: > > 2620:52:9:160c:8448:a3ff:fe51:f102]: failure 13 (Permission denied - > > ipv6: IPv6 is disabled on this device) > > Feb 26 00:24:48 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083488.5041] l3cfg[0f1985ec14299e62,ifindex=2]: unable to > > configure IPv6 route: type unicast fe80::/64 dev 2 metric 1024 mss 0 > > rt-src ipv6ll > > Feb 26 00:24:50 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083490.5034] ipv6ll[95ab7f3fdbfe643d,ifindex=2]: changed: no IPv6 > > link local address to retry after Duplicate Address Detection failures > > (back off) > > Feb 26 00:24:50 ibm-p9z-27-lp26 NetworkManager[818]: <warn> > > [1772083490.5039] platform-linux: do-add-ip6-address[2: > > 2620:52:9:160c:8448:a3ff:fe51:f102]: failure 13 (Permission denied - > > ipv6: IPv6 is disabled on this device) > > Feb 26 00:24:58 ibm-p9z-27-lp26 kernel: Kernel attempted to read user > > page (7fff81210000) - exploit attempt? (uid: 0) > > Feb 26 00:24:58 ibm-p9z-27-lp26 kernel: ------------[ cut here ]------------ > > Feb 26 00:24:58 ibm-p9z-27-lp26 kernel: Bug: Read fault blocked by KUAP! > > Feb 26 00:24:58 ibm-p9z-27-lp26 kernel: WARNING: > > arch/powerpc/mm/fault.c:231 at bad_kernel_fault.isra.0+0xc8/0x2c0, > > CPU#5: lt-ublk.null/57924
oops, it shouldn't be related with `ublk: report BLK_SPLIT_INTERVAL_CAPABLE`, Perhaps one issue lies in the ppcle64 architecture code. I will find one ppc box and try to reproduce this. Thanks,
