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Re: BUG: soft lockup detected on CPU#1!

To: raksac@xxxxxxxxx
Subject: Re: BUG: soft lockup detected on CPU#1!
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Wed, 11 Feb 2009 04:21:21 -0500 (EST)
Cc: xfs@xxxxxxxxxxx
In-reply-to: <407126.80177.qm@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <407126.80177.qm@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: Alpine 1.10 (DEB 962 2008-03-14)

On Tue, 10 Feb 2009, raksac@xxxxxxxxx wrote:


Hello,

I am running the 2.6.28 based xfs kernel driver on a
custom kernel with following kernel config enabled.

CONFIG_PREEMPT
CONFIG_DETECT_SOFTLOCKUP

Running the following xfsqa causes a soft lockup. The
configuration is a x86 with Hyperthreading, 4GB RAM
and a AHCI connected JBOD. Its 100% reproducible.

Any suggestions/inputs on where to start debugging the
problem would be much appreciated.

#! /bin/sh
# FS QA Test No. 008
#
# randholes test
#

BUG: soft lockup detected on CPU#1!
[<4013d525>] softlockup_tick+0x9c/0xaf
[<40123246>] update_process_times+0x3d/0x60
[<401100ab>] smp_apic_timer_interrupt+0x52/0x58
[<40103633>] apic_timer_interrupt+0x1f/0x24
[<402a1557>] _spin_lock_irqsave+0x48/0x61
[<f8b8fe30>] xfs_iflush_cluster+0x16d/0x31c [xfs]
[<f8b9018b>] xfs_iflush+0x1ac/0x271 [xfs]
[<f8ba49a1>] xfs_inode_flush+0xd6/0xfa [xfs]
[<f8bb13c8>] xfs_fs_write_inode+0x27/0x40 [xfs]
[<401789d9>] __writeback_single_inode+0x1b0/0x2ff
[<40101ad5>] __switch_to+0x23/0x1f9
[<40178f87>] sync_sb_inodes+0x196/0x261
[<4017920a>] writeback_inodes+0x67/0xb1
[<401465df>] wb_kupdate+0x7b/0xe0
[<40146bc3>] pdflush+0x0/0x1b5
[<40146ce1>] pdflush+0x11e/0x1b5
[<40146564>] wb_kupdate+0x0/0xe0
[<4012be6d>] kthread+0xc1/0xec
[<4012bdac>] kthread+0x0/0xec
[<401038b3>] kernel_thread_helper+0x7/0x10
=======================

Thanks,
Rakesh




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There were some pretty nasty bugs in 2.6.28 for XFS, can you reproduce it on 2.6.28.4?

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