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From: Michael Kelley <mikelley@microsoft.com>
To: David Mozes <david.mozes@silk.us>,
	"20201001013814.2435935-1-sashal@kernel.org" 
	<20201001013814.2435935-1-sashal@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>
Subject: RE: [PATCH] x86/hyper-v: guard against cpu mask changes in hyperv_flush_tlb_others()
Date: Thu, 5 Aug 2021 18:08:04 +0000	[thread overview]
Message-ID: <MWHPR21MB15937C5C151589EE999ABC63D7F29@MWHPR21MB1593.namprd21.prod.outlook.com> (raw)
In-Reply-To: <VI1PR0401MB24150B31A1D63176BBB788D2F1F19@VI1PR0401MB2415.eurprd04.prod.outlook.com>

From: David Mozes <david.mozes@silk.us>
> 
> Hi,
> The problem is happening to me very frequently on kernel 4.19.195
> 

David -- could you give us a little more context?   Were you running earlier
4.19.xxx versions and did not see this problem?   There was a timing
problem in  hyperv_flush_tlb_others() that was fixed in early January
2021.  The fix was backported to the 4.19 longterm tree, and should
be included in 4.19.195.  Outside of that, I'm not aware of a problem
in this area.

For completeness, what version of Hyper-V are you using?  And how
many vCPUs in your VM?

Michael

> 
> 
> ug  4 03:59:01 c-node04 kernel: [36976.388554] BUG: KASAN: slab-out-of-bounds in hyperv_flush_tlb_others+0xec9/0x1640
> Aug  4 03:59:01 c-node04 kernel: [36976.388556] Read of size 4 at addr ffff889e5e127440 by task ps/52478
> Aug  4 03:59:01 c-node04 kernel: [36976.388556]
> Aug  4 03:59:01 c-node04 kernel: [36976.388560] CPU: 4 PID: 52478 Comm: ps Kdump: loaded Tainted: G        W  OE
> 4.19.195-KM9 #1
> Aug  4 03:59:01 c-node04 kernel: [36976.388562] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine,
> BIOS 090008  12/07/2018
> Aug  4 03:59:01 c-node04 kernel: [36976.388562] Call Trace:
> Aug  4 03:59:01 c-node04 kernel: [36976.388569]  dump_stack+0x11d/0x1a7
> Aug  4 03:59:01 c-node04 kernel: [36976.388572]  ? dump_stack_print_info.cold.0+0x1b/0x1b
> Aug  4 03:59:01 c-node04 kernel: [36976.388576]  ? percpu_ref_tryget_live+0x2f0/0x2f0
> Aug  4 03:59:01 c-node04 kernel: [36976.388580]  ? rb_erase_cached+0xc4c/0x2880
> Aug  4 03:59:01 c-node04 kernel: [36976.388584]  ? printk+0x9f/0xc5
> Aug  4 03:59:01 c-node04 kernel: [36976.388585]  ? snapshot_ioctl.cold.1+0x74/0x74
> Aug  4 03:59:01 c-node04 kernel: [36976.388590]  print_address_description+0x65/0x22e
> Aug  4 03:59:01 c-node04 kernel: [36976.388592]  kasan_report.cold.6+0x243/0x2ff
> Aug  4 03:59:01 c-node04 kernel: [36976.388594]  ? hyperv_flush_tlb_others+0xec9/0x1640
> Aug  4 03:59:01 c-node04 kernel: [36976.388596]  hyperv_flush_tlb_others+0xec9/0x1640
> Aug  4 03:59:01 c-node04 kernel: [36976.388601]  ?
> trace_event_raw_event_hyperv_nested_flush_guest_mapping+0x1b0/0x1b0
> Aug  4 03:59:01 c-node04 kernel: [36976.388603]  ? mem_cgroup_try_charge+0x3cc/0x7d0
> Aug  4 03:59:01 c-node04 kernel: [36976.388608]  flush_tlb_mm_range+0x25c/0x370
> Aug  4 03:59:01 c-node04 kernel: [36976.388611]  ? native_flush_tlb_others+0x3b0/0x3b0
> Aug  4 03:59:01 c-node04 kernel: [36976.388616]  ptep_clear_flush+0x192/0x1d0
> Aug  4 03:59:01 c-node04 kernel: [36976.388618]  ? pmd_clear_bad+0x70/0x70
> Aug  4 03:59:01 c-node04 kernel: [36976.388622]  wp_page_copy+0x861/0x1a30
> Aug  4 03:59:01 c-node04 kernel: [36976.388624]  ? follow_pfn+0x2f0/0x2f0
> Aug  4 03:59:01 c-node04 kernel: [36976.388627]  ? active_load_balance_cpu_stop+0x10d0/0x10d0
> Aug  4 03:59:01 c-node04 kernel: [36976.388632]  ? get_page_from_freelist+0x330c/0x4660
> Aug  4 03:59:01 c-node04 kernel: [36976.388638]  ? activate_page+0x660/0x660
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? rb_erase+0x2a40/0x2a40
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? wake_up_page_bit+0x4d0/0x4d0
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? unwind_next_frame+0x113e/0x1920
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? __pte_alloc_kernel+0x350/0x350
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? deref_stack_reg+0x130/0x130
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  do_wp_page+0x461/0x1ca0
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? deref_stack_reg+0x130/0x130
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? finish_mkwrite_fault+0x710/0x710
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? unwind_next_frame+0x105d/0x1920
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? __pte_alloc_kernel+0x350/0x350
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? __zone_watermark_ok+0x33c/0x640
> Aug  4 03:59:01 c-node04 kernel: [36976.388639]  ? _raw_spin_lock+0x13/0x30
> Pattern not found  (press RETURN)

  reply	other threads:[~2021-08-05 18:08 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 11:23 David Mozes
2021-08-05 18:08 ` Michael Kelley [this message]
     [not found] <CA+qYZY3a-FHfWNL2=na6O8TRJYu9kaeyp80VNDxaDTi2EBGoog@mail.gmail.com>
2021-08-06 10:43 ` Michael Kelley
2021-08-06 17:35   ` David Mozes
     [not found]     ` <CAHkVu0-ZCXDRZL92d_G3oKpPuKvmY=YEbu9nbx9vkZHnhHFD8Q@mail.gmail.com>
2021-08-06 21:51       ` Michael Kelley
2021-08-07  5:00         ` David Moses
2021-08-17  9:16           ` David Mozes
2021-08-17 11:29             ` Wei Liu
2021-08-19 11:05               ` David Mozes
     [not found]               ` <CA+qYZY1U04SkyHo7X+rDeE=nUy_X5nxLfShyuLJFzXnFp2A6uw@mail.gmail.com>
     [not found]                 ` <VI1PR0401MB24153DEC767B0126B1030E07F1C09@VI1PR0401MB2415.eurprd04.prod.outlook.com>
2021-08-22 15:24                   ` Wei Liu
2021-08-22 16:25                     ` David Mozes
2021-08-22 17:32                       ` Wei Liu
  -- strict thread matches above, loose matches on Subject: below --
2020-10-01  1:38 Sasha Levin
2020-10-01  9:40 ` Vitaly Kuznetsov
2020-10-01 11:53   ` Wei Liu
2020-10-01 13:04     ` Sasha Levin
2020-10-03 17:40       ` Michael Kelley
2020-10-05 14:58         ` Wei Liu
2021-01-05 16:59           ` Michael Kelley
2021-01-05 17:10             ` Wei Liu
2021-01-08 15:22             ` Sasha Levin
2020-10-01 13:10     ` Vitaly Kuznetsov

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