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Date: Thu, 22 Sep 2022 14:40:00 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: Phil Auld <pauld@...hat.com> Cc: Petr Štetiar <ynezz@...e.cz>, linux-kernel@...r.kernel.org, yury.norov@...il.com, rafael@...nel.org Subject: Re: aarch64 5.15.68 regression in topology/thread_siblings (huge file size and no content) On Thu, Sep 22, 2022 at 08:32:10AM -0400, Phil Auld wrote: > On Thu, Sep 22, 2022 at 01:32:17PM +0200 Petr Štetiar wrote: > > Hi, > > > > we've got a recent bug report[1], that lscpu segfaults on aarch64 board running > > 5.15.y kernel. It is working fine on 5.10.y kernel. > > > > I've tracked it down[2] to the issue with `topology/thread_siblings` which > > apart from very strange file size returns empty content. I assume, that it's > > somehow related to the changes done in commit bb9ec13d156e ("topology: use > > bin_attribute to break the size limitation of cpumap ABI"), but I didn't tried > > to revert it yet to verify it. > > > > This is actually due to a fix for that since returning 0 size breaks > things as well. > > 7ee951acd31a drivers/base: fix userspace break from using bin_attributes for cpumap and cpulist > > The fix for small number of cpus as you have is now in Greg's driver core tree > > d7f06bdd6ee8 drivers/base: Fix unsigned comparison to -1 in CPUMAP_FILE_MAX_BYTES > > and should work it's way back to stable trees soon. That should fix up the file size issue. The main problem being reported here is: > > Kernel 5.15.68: > > > > root@...nWrt:/# uname -a > > Linux OpenWrt 5.15.68 #0 SMP Wed Sep 21 05:54:21 2022 aarch64 GNU/Linux > > > > root@...nWrt:/# find /sys -name thread_siblings -exec ls -al {} \; > > -r--r--r-- 1 root root 18446744073709551615 Sep 22 08:37 /sys/devices/system/cpu/cpu1/topology/thread_siblings > > -r--r--r-- 1 root root 18446744073709551615 Sep 22 08:37 /sys/devices/system/cpu/cpu0/topology/thread_siblings > > > > root@...nWrt:/# find /sys -name thread_siblings -exec cat {} \; > > root@...nWrt:/# Nothing in the file in 5.15, yet 5.10: > > > > Kernel 5.10.138: > > > > root@...nWrt:/# uname -a > > Linux OpenWrt 5.10.138 #0 SMP Sat Sep 3 02:55:34 2022 aarch64 GNU/Linux > > > > root@...nWrt:/# find /sys -name thread_siblings -exec cat {} \; > > 2 > > 1 Has data in the files. What caused that change? thanks, greg k-h
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