Messages in this thread | | | Date | Thu, 22 Sep 2022 16:05:04 +0200 | From | Petr Štetiar <> | Subject | Re: aarch64 5.15.68 regression in topology/thread_siblings (huge file size and no content) |
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Phil Auld <pauld@redhat.com> [2022-09-22 09:18:47]:
Hi,
> I've seen the size cause problems for tools. Are we sure that it's the empty file and not > the size causing issues? Maybe something is treating that as signed again for a count of > -1 bytes (which seems like it would be a bug anyway)?
root@OpenWrt:/# strace cat /sys/devices/system/cpu/cpu1/topology/thread_siblings ...snip... openat(AT_FDCWD, "/sys/devices/system/cpu/cpu1/topology/thread_siblings", O_RDONLY|O_LARGEFILE) = 3 sendfile(1, 3, NULL, 16777216) = 0
root@OpenWrt:/# strace md5sum /sys/devices/system/cpu/cpu1/topology/thread_sibli ...snip... openat(AT_FDCWD, "/sys/devices/system/cpu/cpu1/topology/thread_siblings", O_RDONLY|O_LARGEFILE) = 3 read(3, "", 4096) = 0
root@OpenWrt:/# strace head /sys/devices/system/cpu/cpu1/topology/thread_siblings ...snip... openat(AT_FDCWD, "/sys/devices/system/cpu/cpu1/topology/thread_siblings", O_RDONLY|O_LARGEFILE) = 3 read(3, "", 1024) = 0
Cheers,
Petr
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