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[Xen-devel] BUG: soft lockup detected on CPU#0!

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] BUG: soft lockup detected on CPU#0!
From: Abhinav Srivastava <abhinavs_iitkgp@xxxxxxxxxxx>
Date: Mon, 10 Sep 2007 03:14:04 +0100 (BST)
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Hi there,

I am using Xen 3.0.3 testing and getting following
error in domU while doing large copy:

#time cp -R linux-2.6.18 linux-cp
BUG: soft lockup detected on CPU#0!

Pid: 998, comm:                   cp
EIP: 0061:[<c0101227>] CPU: 0
EIP is at 0xc0101227
 EFLAGS: 00000286    Not tainted  ( #52)
EAX: 00000000 EBX: deadbeef ECX: deadbeef EDX:
ESI: 0000055e EDI: bf874000 EBP: c7b6a000 DS: 007b ES:
CR0: 8005003b CR2: 08061494 CR3: 07204000 CR4:
 [<c010693b>] sysxenentrynotifier+0x3b/0x50
 [<c0104f8c>] syscall_call+0xa/0x16

sysxenentrynotifier is my function, which i call from
system call handler to intercept system calls. I am
also logging events inside xen and passing it to dom0
using shared memory setup between dom0 and Xen. When I
copy events to dom0, I pause domU for sometime using
function set_bit(VCPUF_blocked) and and then i
un-pause it using clead_bit(VCPUF_blocked).

Copy operation runs fine for sometime but after that
domU gets hung and when I press any key in domU, it
throws above mentioned error.

If I try to perform the same operation but my logging
code disabled, it works fine. Is it the problem
related to my code or some Xen problem, which gets
enabled when I pause or unpause domU.

Any help or pointers in this regard would be very much


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