linux-kernel - Re: [PATCH] x86/hyper-v: guard against cpu mask changes in hyperv_flush_tlb

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Message-ID: <VI1PR0401MB24150B31A1D63176BBB788D2F1F19@VI1PR0401MB2415.eurprd04.prod.outlook.com>
Date:   Wed, 4 Aug 2021 11:23:52 +0000
From:   David Mozes <david.mozes@...k.us>
To:     "20201001013814.2435935-1-sashal@...nel.org" 
        <20201001013814.2435935-1-sashal@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/hyper-v: guard against cpu mask changes in
 hyperv_flush_tlb_others()

Hi,
The problem is happening to me very frequently on kernel 4.19.195 



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)