On 18/07/2019 15:48, Juergen Gross wrote: > On 15.07.19 16:08, Sergey Dyasli wrote: >> On 05/07/2019 14:56, Dario Faggioli wrote: >>> On Fri, 2019-07-05 at 14:17 +0100, Sergey Dyasli wrote: >>>> 1) This crash is quite likely to happen: >>>> >>>> [2019-07-04 18:22:46 UTC] (XEN) [ 3425.220660] Watchdog timer detects >>>> that CPU2 is stuck! >>>> [2019-07-04 18:22:46 UTC] (XEN) [ 3425.226293] ----[ Xen-4.13.0- >>>> 8.0.6-d x86_64 debug=y Not tainted ]---- >>>> [...] >>>> [2019-07-04 18:22:47 UTC] (XEN) [ 3425.501989] Xen call trace: >>>> [2019-07-04 18:22:47 UTC] (XEN) [ >>>> 3425.505278] [<ffff82d08023d578>] vcpu_sleep_sync+0x50/0x71 >>>> [2019-07-04 18:22:47 UTC] (XEN) [ >>>> 3425.511518] [<ffff82d080208370>] vcpu_pause+0x21/0x23 >>>> [2019-07-04 18:22:47 UTC] (XEN) [ >>>> 3425.517326] [<ffff82d08023e25d>] >>>> vcpu_set_periodic_timer+0x27/0x73 >>>> [2019-07-04 18:22:47 UTC] (XEN) [ >>>> 3425.524258] [<ffff82d080209682>] do_vcpu_op+0x2c9/0x668 >>>> [2019-07-04 18:22:47 UTC] (XEN) [ >>>> 3425.530238] [<ffff82d08024f970>] compat_vcpu_op+0x250/0x390 >>>> [2019-07-04 18:22:47 UTC] (XEN) [ >>>> 3425.536566] [<ffff82d080383964>] pv_hypercall+0x364/0x564 >>>> [2019-07-04 18:22:47 UTC] (XEN) [ >>>> 3425.542719] [<ffff82d080385644>] do_entry_int82+0x26/0x2d >>>> [2019-07-04 18:22:47 UTC] (XEN) [ >>>> 3425.548876] [<ffff82d08038839b>] entry_int82+0xbb/0xc0 >>>> >>> Mmm... vcpu_set_periodic_timer? >>> >>> What kernel is this and when does this crash happen? >> >> Hi Dario, >> >> I can easily reproduce this crash using a Debian 7 PV VM (2 vCPUs, 2GB RAM) >> which has the following kernel: >> >> # uname -a >> >> Linux localhost 3.2.0-4-amd64 #1 SMP Debian 3.2.78-1 x86_64 GNU/Linux >> >> All I need to do is suspend and resume the VM. > > Happens with a more recent kernel, too. > > I can easily reproduce the issue with any PV guest with more than 1 vcpu > by doing "xl save" and then "xl restore" again. > > With the reproducer being available I'm now diving into the issue...
One further thing to add is that I was able to avoid the crash by reverting xen/sched: rework and rename vcpu_force_reschedule() which is a part of the series. This made all tests with PV guests pass. Another question I have is do you have a git branch with core-scheduling patches rebased on top of current staging available somewhere? Thanks, Sergey _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel