Live Migration Never Finishes With UEK3 And ASM On Oracle VM

(Doc ID 2202426.1)

Last updated on OCTOBER 26, 2017

Applies to:

Oracle VM - Version 3.3.4 and later
Linux x86-64

Symptoms

Live migration (xm migrate -l) seem to work OK with RAC on OVM 3.2+, however,as soon as an ACFS(ASM Cluster file system) volume is used it seems to stall indefinitely.

For kernel UEK3 (3.8.13-118.8.1), it reported 'Freezing user space processes ...' in dmesg_uek3 before process 3235 in D status.

Freezing user space processes ...
Freezing of tasks failed after 20.00 seconds (1 tasks refusing to freeze, wq_busy=0):
asm_vmb0_+asm2 D 0000000000000002 0 3235 1 0x00000004
ffff880397803c18 0000000000000086 ffff880397803fd8 0000000000013040
ffff880397802010 0000000000013040 0000000000013040 0000000000013040
ffff880397803fd8 0000000000013040 ffff8803983e2300 ffff880397f28140
Call Trace:
[<ffffffff815a01c9>] schedule+0x29/0x70
[<ffffffffa03b0be5>] KsSleepEvent+0x105/0x120 [oracleoks]
[<ffffffff81086da0>] ? wake_up_bit+0x40/0x40
[<ffffffffa04597fe>] Asm_ioctlVMB+0x317/0x467 [oracleadvm]
[<ffffffff815a101e>] ? _raw_spin_lock+0xe/0x20
[<ffffffffa045b37b>] AsmIoctl+0x81d/0x92a [oracleadvm]
[<ffffffffa049f2de>] asmIoctl_int+0x185/0x1af [oracleadvm]
[<ffffffffa049f326>] asmIoctl+0xe/0x10 [oracleadvm]
[<ffffffff81273f78>] __blkdev_driver_ioctl+0x28/0x30
[<ffffffff81274610>] blkdev_ioctl+0x200/0x7b0
[<ffffffff811cef5c>] block_ioctl+0x3c/0x40
[<ffffffff811a84bc>] do_vfs_ioctl+0x8c/0x350
[<ffffffff8159fb1d>] ? __schedule+0x3fd/0x720
[<ffffffff811a8821>] sys_ioctl+0xa1/0xb0
[<ffffffff815a9d79>] system_call_fastpath+0x16/0x1b

Restarting tasks ... done.

 

 

Changes

 

Cause

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