Oracle VM Server Reporting "WARNING: at drivers/block/xen-blkback/xenbus.c:269 xen_blkif_free+0x177/0x180 [xen_blkback]()"

(Doc ID 2331280.1)

Last updated on NOVEMBER 28, 2017

Applies to:

Oracle VM - Version 3.3.1 to 3.4.4 [Release OVM33 to OVM34]
Linux x86-64

Symptoms

 On Oracle VM Server running UEK3 kernel, below warning is reported in system log:

Jun 4 14:01:06 ovs-TEST kernel: ------------[ cut here ]------------
Jun 4 14:01:06 ovs-TEST kernel: WARNING: at drivers/block/xen-blkback/xenbus.c:269 xen_blkif_free+0x177/0x180 [xen_blkback]()
Jun 4 14:01:06 ovs-TEST kernel: Hardware name: ProLiant DL380 Gen9
Jun 4 14:01:06 ovs-TEST kernel: Modules linked in: tun btrfs zlib_deflate libcrc32c ocfs2 xen_pciback xen_netback xen_blkback xen_gntalloc xen_gntdev xen_evtchn xenfs xen_privcmd ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs bnx2fc fcoe libfcoe libfc 8021q garp sunrpc bridge stp llc bonding ipv6 coretemp freq_table mperf intel_powerclamp ghash_clmulni_intel microcode serio_raw pcspkr hpilo hpwdt ioatdma dca ses enclosure sg ext4 jbd2 mbcache dm_round_robin usb_storage sd_mod crc_t10dif aesni_intel ablk_helper cryptd lrw aes_x86_64 xts gf128mul xhci_hcd qla2xxx scsi_transport_fc scsi_tgt tg3 hwmon ptp pps_core wmi dm_multipath dm_mirror dm_region_hash dm_log dm_mod crc32c_intel be2iscsi bnx2i cnic uio cxgb4i cxgb4 cxgb3i libcxgbi cxgb3 mdio libiscsi_tcp qla4xxx iscsi_boot_sysfs libiscsi scsi_transport_iscsi
Jun 4 14:01:06 ovs-TEST kernel: Pid: 21786, comm: kworker/7:5 Tainted: G W 3.8.13-118.3.2.el6uek.x86_64 #2
Jun 4 14:01:06 ovs-TEST kernel: Call Trace:
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff8106092f>] warn_slowpath_common+0x7f/0xc0
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff8106098a>] warn_slowpath_null+0x1a/0x20
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffffa07a5707>] xen_blkif_free+0x177/0x180 [xen_blkback]
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffffa07a5725>] xen_blkif_deferred_free+0x15/0x20 [xen_blkback]
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff8107ea50>] process_one_work+0x180/0x420
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff8108119e>] worker_thread+0x12e/0x390
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff81081070>] ? manage_workers+0x180/0x180
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff810864ee>] kthread+0xce/0xe0
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff81086420>] ? kthread_freezable_should_stop+0x70/0x70
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff815a9a48>] ret_from_fork+0x58/0x90
Jun 4 14:01:06 ovs-TEST kernel: [<ffffffff81086420>] ? kthread_freezable_should_stop+0x70/0x70
Jun 4 14:01:06 ovs-TEST kernel: ---[ end trace da30005c4aa95637 ]

 

Changes

 No Changes

Cause

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