On 06/02/2020 09:57, Jürgen Groß wrote: > On 05.02.20 17:03, Sergey Dyasli wrote: >> Hello, >> >> I'm currently investigating a Live-Patch application failure in core- >> scheduling mode and this is an example of what I usually get: >> (it's easily reproducible) >> >> (XEN) [ 342.528305] livepatch: lp: CPU8 - IPIing the other 15 CPUs >> (XEN) [ 342.558340] livepatch: lp: Timed out on semaphore in CPU >> quiesce phase 13/15 >> (XEN) [ 342.558343] bad cpus: 6 9 >> >> (XEN) [ 342.559293] CPU: 6 >> (XEN) [ 342.559562] Xen call trace: >> (XEN) [ 342.559565] [<ffff82d08023f304>] R >> common/schedule.c#sched_wait_rendezvous_in+0xa4/0x270 >> (XEN) [ 342.559568] [<ffff82d08023f8aa>] F >> common/schedule.c#schedule+0x17a/0x260 >> (XEN) [ 342.559571] [<ffff82d080240d5a>] F >> common/softirq.c#__do_softirq+0x5a/0x90 >> (XEN) [ 342.559574] [<ffff82d080278ec5>] F >> arch/x86/domain.c#guest_idle_loop+0x35/0x60 >> >> (XEN) [ 342.559761] CPU: 9 >> (XEN) [ 342.560026] Xen call trace: >> (XEN) [ 342.560029] [<ffff82d080241661>] R _spin_lock_irq+0x11/0x40 >> (XEN) [ 342.560032] [<ffff82d08023f323>] F >> common/schedule.c#sched_wait_rendezvous_in+0xc3/0x270 >> (XEN) [ 342.560036] [<ffff82d08023f8aa>] F >> common/schedule.c#schedule+0x17a/0x260 >> (XEN) [ 342.560039] [<ffff82d080240d5a>] F >> common/softirq.c#__do_softirq+0x5a/0x90 >> (XEN) [ 342.560042] [<ffff82d080279db5>] F >> arch/x86/domain.c#idle_loop+0x55/0xb0 >> >> The first HT sibling is waiting for the second in the LP-application >> context while the second waits for the first in the scheduler context. >> >> Any suggestions on how to improve this situation are welcome. > > Can you test the attached patch, please? It is only tested to boot, so > I did no livepatch tests with it.
Thank you for the patch! It seems to fix the issue in my manual testing. I'm going to submit automatic LP testing for both thread/core modes. -- Thanks, Sergey _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
