Control: reopen -1 Control: severity -1 normal On Fri, 2016-03-11 at 01:12 +0100, Harry Junior wrote: > On Thu, 10 Mar 2016 17:34:54 +0000 Ben Hutchings wrote: > > > > On Thu, 2016-03-10 at 17:32 +0100, Harry Junior wrote: > > > > > > Package: linux-image-4.4.0-1-amd64 > > > Version: 4.4.4-1 > > > Severity: critical > > > Justification: renders system unusable > > > > > > > > > When I run the following commands, the system freezes: > > > > > > # echo 0 | tee /sys/devices/system/cpu/cpu*/online && echo 1 | sudo > > > tee /sys/devices/system/cpu/cpu*/online > > > > > > The system freezes randomly when the CPUs are being onlined or > > > offlined. The system is installed on a VMware virtual machine with 4 > > > processors. Here's a stacktrace of the infinite loop: > > [...] > > > > You just asked to offline all CPUs, making the system unusable. Â I > > don't see any bug here. > I'm sorry to disagree, but the CPU0 can't be offlined and remains online: [...]
Depending on the configuration, it may be possible to offline CPU0.
However, I have been informed that the kernel still prevents offlining
the last CPU - or at least it is supposed to.
So I'm reopening this, but correcting the severity. ("renders system
unusable" does *not* mean the system hangs or crashes, it means the
system becomes unbootable or otherwise persistently broken.)
Ben.
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Ben Hutchings
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