Messages in this thread | | | Date | Tue, 19 Dec 2017 05:42:39 -0800 | From | Tejun Heo <> | Subject | Re: PROBLEM: NULL pointer dereference in kernel 4.14.6 |
| |
On Sun, Dec 17, 2017 at 03:24:48PM -0800, vcaputo@pengaru.com wrote: > On Sun, Dec 17, 2017 at 05:49:44PM +0000, Bronek Kozicki wrote: > > I just upgraded to 4.14.7 and tried to reproduce this error, this time under strace. As you can see this happens when systemctl tries to read a specific entry under /sys/fs . In case this matters, the entry is for a small virtual machine running under qemu/kvm and managed by libvirt. > > > > open("/sys/fs/cgroup/unified/machine.slice", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 5 > > fstat(5, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 > > getdents(5, /* 12 entries */, 32768) = 464 > > openat(AT_FDCWD, "/sys/fs/cgroup/unified/machine.slice/machine-qemu\\x2d1\\x2dkartuzy\\x2dspice.scope/cgroup.procs", O_RDONLY|O_CLOEXEC) = 8 > > fstat(8, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > > read(8, <unfinished ...>) = ? > > +++ killed by SIGKILL +++ > > [1] 12078 killed strace -- systemctl status > > > > > > This recently came through lkml, may be related: > https://marc.info/?l=linux-kernel&m=151320108922415&w=2
It looks like it could be the same problem. Working on the fix now. Will let you know when I have something.
Thanks.
-- tejun
| |