Re: xfs trace in 4.4.2

From: Brian Foster <bfoster@redhat.com>
To: Stefan Priebe <s.priebe@profihost.ag>
Cc: linux-fsdevel@vger.kernel.org,
	"xfs-masters@oss.sgi.com" <xfs-masters@oss.sgi.com>,
	"xfs@oss.sgi.com" <xfs@oss.sgi.com>
Subject: Re: xfs trace in 4.4.2
Date: Sat, 20 Feb 2016 09:45:34 -0500	[thread overview]
Message-ID: <20160220144533.GA36182@bfoster.bfoster> (raw)
In-Reply-To: <56C81D94.7090603@profihost.ag>

On Sat, Feb 20, 2016 at 09:02:28AM +0100, Stefan Priebe wrote:
> Hi,
> 
> got this one today. Not sure if this is a bug.
> 

That looks like the releasepage() delayed allocation block warning. I'm
not sure we've had any fixes for (or reports of) that issue since the
v4.2 timeframe.

What is the xfs_info of the associated filesystem? Also, do you have any
insight as to the possible reproducer application or workload? Is this
reproducible at all? Note that this is a WARN_ON_ONCE(), so the warning
won't fire again regardless until after a reboot.

Brian

> [67674.907736] ------------[ cut here ]------------
> [67674.955858] WARNING: CPU: 5 PID: 197 at fs/xfs/xfs_aops.c:1232
> xfs_vm_releasepage+0xa9/0xe0()
> [67675.005345] Modules linked in: dm_mod netconsole ipt_REJECT
> nf_reject_ipv4 mpt3sas raid_class xt_multiport iptable_filter ip_tabl
> es x_tables 8021q garp bonding coretemp loop usbhid ehci_pci ehci_hcd
> sb_edac ipmi_si usbcore i2c_i801 edac_core usb_common ipmi_msg
> handler button btrfs xor raid6_pq raid1 md_mod sg igb sd_mod i2c_algo_bit
> ixgbe ahci i2c_core mdio isci libahci libsas ptp megaraid_
> sas scsi_transport_sas pps_core
> [67675.221939] CPU: 5 PID: 197 Comm: kswapd0 Not tainted 4.4.2+1-ph #1
> [67675.277120] Hardware name: Supermicro
> X9DRi-LN4+/X9DR3-LN4+/X9DRi-LN4+/X9DR3-LN4+, BIOS 3.2 03/04/2015
> [67675.335176]  ffffffffa3a5065d ffff88007950fa98 ffffffffa33bd4e1
> 0000000000000001
> [67675.392983]  0000000000000000 ffff88007950fad8 ffffffffa3083587
> ffff88007950fae8
> [67675.449743]  0000000000000001 ffffea0020883480 ffff880cf4b9cdd0
> ffffea00208834a0
> [67675.506112] Call Trace:
> [67675.561285]  [<ffffffffa33bd4e1>] dump_stack+0x45/0x64
> [67675.619364]  [<ffffffffa3083587>] warn_slowpath_common+0x97/0xe0
> [67675.675719]  [<ffffffffa30835ea>] warn_slowpath_null+0x1a/0x20
> [67675.731113]  [<ffffffffa3320a89>] xfs_vm_releasepage+0xa9/0xe0
> [67675.786116]  [<ffffffffa318a4b0>] ? page_mkclean_one+0xd0/0xd0
> [67675.844216]  [<ffffffffa318b1d0>] ? anon_vma_prepare+0x150/0x150
> [67675.903862]  [<ffffffffa31506c2>] try_to_release_page+0x32/0x50
> [67675.957625]  [<ffffffffa3164d3e>] shrink_active_list+0x3ce/0x3e0
> [67676.011497]  [<ffffffffa31653d7>] shrink_lruvec+0x687/0x7d0
> [67676.064980]  [<ffffffffa31655fc>] shrink_zone+0xdc/0x2c0
> [67676.118828]  [<ffffffffa3166659>] kswapd+0x4f9/0x930
> [67676.172075]  [<ffffffffa3166160>] ?
> mem_cgroup_shrink_node_zone+0x150/0x150
> [67676.225139]  [<ffffffffa30a08c9>] kthread+0xc9/0xe0
> [67676.277539]  [<ffffffffa30a0800>] ? kthread_stop+0xe0/0xe0
> [67676.330124]  [<ffffffffa36a8c8f>] ret_from_fork+0x3f/0x70
> [67676.381816]  [<ffffffffa30a0800>] ? kthread_stop+0xe0/0xe0
> [67676.433499] ---[ end trace cb1827fe308f7f6b ]---
> 
> Greets Stefan
> 
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