From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by ug-out-1314.google.com with SMTP id s2so67514uge for ; Wed, 11 Apr 2007 02:14:46 -0700 (PDT) Message-ID: Date: Wed, 11 Apr 2007 17:14:46 +0800 From: "Zhao Forrest" Subject: Re: Why kmem_cache_free occupy CPU for more than 10 seconds? In-Reply-To: <84144f020704102353r7dcc3538u2e34237d3496630e@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <84144f020704102353r7dcc3538u2e34237d3496630e@mail.gmail.com> Sender: owner-linux-mm@kvack.org Return-Path: To: Pekka Enberg Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: I enable CONFIG_DEBUG_SLAB, but don't get any extra debug messages related to slab. Is there other switch that I need to turn on? Thanks, Forrest BUG: soft lockup detected on CPU#6! Call Trace: [] softlockup_tick+0xdb/0xed [] update_process_times+0x42/0x68 [] smp_local_timer_interrupt+0x23/0x47 [] smp_apic_timer_interrupt+0x41/0x47 [] apic_timer_interrupt+0x66/0x6c [] invalidate_mapping_pages+0xe1/0x15f [] invalidate_mapping_pages+0xd2/0x15f [] kill_bdev+0xe/0x21 [] __blkdev_put+0x4f/0x169 [] __fput+0xae/0x198 [] filp_close+0x5c/0x64 [] put_files_struct+0x6c/0xc3 [] do_exit+0x2d2/0x8b1 [] cpuset_exit+0x0/0x6c [] get_signal_to_deliver+0x427/0x456 [] do_notify_resume+0x9c/0x7a9 [] default_wake_function+0x0/0xe [] audit_syscall_exit+0x2cd/0x2ec [] int_signal+0x12/0x17 On 4/11/07, Pekka Enberg wrote: > On 4/11/07, Zhao Forrest wrote: > > We're using RHEL5 with kernel version 2.6.18-8.el5. > > When doing a stress test on raw device for about 3-4 hours, we found > > the soft lockup message in dmesg. > > I know we're not reporting the bug on the latest kernel, but does any > > expert know if this is the known issue in old kernel? Or why > > kmem_cache_free occupy CPU for more than 10 seconds? > > Sounds like slab corruption. CONFIG_DEBUG_SLAB should tell you more. > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org