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Crash when using cpupools
- To: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Fri, 3 Sep 2021 15:41:47 +0000
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- Cc: Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>
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- Thread-topic: Crash when using cpupools
Hi,
While doing some investigation with cpupools I encountered a crash when trying
to isolate a guest to its own physical cpu.
I am using current staging status.
I did the following (on FVP with 8 cores):
- start dom0 with dom0_max_vcpus=1
- remove core 1 from dom0 cpupool: xl cpupool-cpu-remove Pool-0 1
- create a new pool: xl cpupool-create name=\"NetPool\”
- add core 1 to the pool: xl cpupool-cpu-add NetPool 1
- create a guest in NetPool using the following in the guest config:
pool=“NetPool"
I end with a crash with the following call trace during guest creation:
(XEN) Xen call trace:
(XEN) [<0000000000234cb0>] credit2.c#csched2_alloc_udata+0x58/0xfc (PC)
(XEN) [<0000000000234c80>] credit2.c#csched2_alloc_udata+0x28/0xfc (LR)
(XEN) [<0000000000242d38>] sched_move_domain+0x144/0x6c0
(XEN) [<000000000022dd18>] cpupool.c#cpupool_move_domain_locked+0x38/0x70
(XEN) [<000000000022fadc>] cpupool_do_sysctl+0x73c/0x780
(XEN) [<000000000022d8e0>] do_sysctl+0x788/0xa58
(XEN) [<0000000000273b68>] traps.c#do_trap_hypercall+0x78/0x170
(XEN) [<0000000000274f70>] do_trap_guest_sync+0x138/0x618
(XEN) [<0000000000260458>] entry.o#guest_sync_slowpath+0xa4/0xd4
After some debugging I found out that unit->vcpu_list is NULL after
unit->vcpu_list = d->vcpu[unit->unit_id]; with unit_id 0 in
common/sched/core.c:688
This makes the call to is_idle_unit(unit) in csched2_alloc_udata trigger the
crash.
Am I doing something wrong ?
Is it a know problem ?
Does anybody have a pointer of where the source of the issue might be ?
I have a working setup to debug this if any other info is required to
understand the issue.
Cheers
Bertrand
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