Hi Tejun,
On 11/24/2015 03:44 PM, Tejun Heo wrote:
> On Tue, Nov 24, 2015 at 11:31:18AM +0100, Daniel Wagner wrote:
>> [ 19.369455] ------------[ cut here ]------------
>> [ 19.369851] WARNING: CPU: 1 PID: 1 at kernel/cgroup_pids.c:97 pids_cancel.constprop.6+0x31/0x40()
>> [ 19.370596] Modules linked in:
>> [ 19.370916] CPU: 1 PID: 1 Comm: systemd Not tainted 4.4.0-rc1+ #29
>> [ 19.371418] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
>> [ 19.372542] ffffffff81f65382 ffff88007c043b90 ffffffff81551ffc 0000000000000000
>> [ 19.373173] ffff88007c043bc8 ffffffff810de202 ffff88007a752000 ffff88007a29ab00
>> [ 19.374144] ffff88007c043c80 ffff88007a1d8400 0000000000000001 ffff88007c043bd8
>> [ 19.375185] Call Trace:
>> [ 19.375506] [<ffffffff81551ffc>] dump_stack+0x4e/0x82
>> [ 19.376238] [<ffffffff810de202>] warn_slowpath_common+0x82/0xc0
>> [ 19.376975] [<ffffffff810de2fa>] warn_slowpath_null+0x1a/0x20
>> [ 19.377765] [<ffffffff8118e031>] pids_cancel.constprop.6+0x31/0x40
>> [ 19.378623] [<ffffffff8118e0fd>] pids_can_attach+0x6d/0xf0
>> [ 19.379451] [<ffffffff81188a4c>] cgroup_taskset_migrate+0x6c/0x330
>> [ 19.380142] [<ffffffff81188e05>] cgroup_migrate+0xf5/0x190
>
> Can you please describe how to reproduce this one?
I start a not so updated rawhide image with some funky kernel options.
They are more less some left overs from debugging:
$QEMU -gdb tcp::1235 -enable-kvm -machine accel=kvm \
-m 2G -cpu Haswell \
-smp sockets=1,cores=2,threads=2 \
-hda ~/vm-images/rawhide-big.qcow2\
-net nic,model=virtio \
-net user,hostfwd=tcp::7777-:22 \
-monitor telnet:127.0.0.1:1234,server,nowait \
-serial stdio -display none \
-append "root=/dev/sda1 console=ttyS0 audit=0 isolcpus=3 systemd.unified_cgroup_hierarchy=1" \
-kernel arch/x86_64/boot/bzImage $@
After starting the image I just wait for a few seconds and I'll get it.
No interaction needed.
> If you have a qemu image which reproduces this, I'd be happy to take
> a look at it.
I'll upload it, though it will take a while... the fun of living
with asymmetric connectivity.
cheers,
daniel
--
To unsubscribe from this list: send the line "unsubscribe cgroups" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
