From: Eugene Istomin <E.Istomin@edss.ee>
To: jbeulich@suse.com
Cc: xen-devel@lists.xen.org
Subject: Fwd: Re: soft lockups of tapdisk2 process - xen 4.4, kernel 3.12.17
Date: Thu, 17 Apr 2014 09:52:51 +0300 [thread overview]
Message-ID: <1739620.IOQmuV5zLU@evis> (raw)
Hello Jan,
can you help in resolving?
Can patches "xen-ipi-per-cpu-irq", "xen-privcmd-hcall-preemption" leads to
misfolding IPI?
Thanks.
---
Best regards,
Eugene Istomin
---------- Forwarded Message ----------
Subject: Re: [Xen-devel] soft lockups of tapdisk2 process - xen 4.4, kernel
3.12.17
Date: Thursday, April 17, 2014, 09:39:27 AM
From: Eugene Istomin <E.Istomin@edss.ee>
To: xen-devel@lists.xen.org
We compare 3.12/3.13/3.14 kernels (keyword - PREEMPT_NEED_RESCHED), 3.12
haven't any patches for related to PREEMPT_NEED_RESCHED:
3.12 - https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/?id=refs%2Ftags%2Fv3.12.17&qt=grep&q=PREEMPT_NEED_RESCHED
3.13 - https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/?id=refs%2Ftags%2Fv3.13.10&qt=grep&q=PREEMPT_NEED_RESCHED
3.14 - https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/?id=refs%2Ftags%2Fv3.14.1&qt=grep&q=kmemleak.c
What do you think about commit ba1f14fbe70965ae0fb1655a5275a62723f65b77
(https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ba1f14fbe70965ae0fb1655a5275a62723f65b77
)? May this problem related to interrupt handling?
[ 6624.928058] Call Trace:
[ 6624.928058] [<ffffffff8036d192>] notify_remote_via_ipi+0x82/0xb0
..
---
Best regards,
Eugene Istomin
On Thursday, April 17, 2014 08:11:25 AM Eugene Istomin wrote:
Hello,
after updating from xen 4.3 to xen 4.4 we have strange soft lockups, here is
log - https://gist.github.com/evis/10953677.
We already disabled c-states in BIOS, kernel (processor.max_cstate=1
intel_idle.max_cstate=0), dom0 (xenpm set-max-cstate 1). An easy step to
reproduce in our environment - run 2 VMs with DRBD-backed disk.
What "blktap_run_deferred" in this trace mean and why dom0 needs to call
"blktap_device_restart"?
force_evtchn_callback+0xe/0x10
blktap_device_restart+0xdf/0xf0 [blktap2]
blktap_run_deferred+0xd1/0xe0 [blktap2]
blktap_ring_ioctl+0x3a5/0x4d0 [blktap2]
Thanks.
---
Best regards,
Eugene Istomin
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next reply other threads:[~2014-04-17 6:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-17 6:52 Eugene Istomin [this message]
2014-04-17 7:43 ` Fwd: Re: soft lockups of tapdisk2 process - xen 4.4, kernel 3.12.17 Jan Beulich
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