Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934821Ab3FSO2H (ORCPT ); Wed, 19 Jun 2013 10:28:07 -0400 Received: from cantor2.suse.de ([195.135.220.15]:43816 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934543Ab3FSO2E (ORCPT ); Wed, 19 Jun 2013 10:28:04 -0400 Date: Wed, 19 Jun 2013 16:28:01 +0200 From: Michal Hocko To: Glauber Costa Cc: Andrew Morton , Dave Chinner , linux-mm@kvack.org, LKML Subject: Re: linux-next: slab shrinkers: BUG at mm/list_lru.c:92 Message-ID: <20130619142801.GA21483@dhcp22.suse.cz> References: <20130617141822.GF5018@dhcp22.suse.cz> <20130617151403.GA25172@localhost.localdomain> <20130617143508.7417f1ac9ecd15d8b2877f76@linux-foundation.org> <20130617223004.GB2538@localhost.localdomain> <20130618062623.GA20528@localhost.localdomain> <20130619071346.GA9545@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130619071346.GA9545@dhcp22.suse.cz> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4819 Lines: 98 On Wed 19-06-13 09:13:46, Michal Hocko wrote: > On Tue 18-06-13 10:26:24, Glauber Costa wrote: > [...] > > Michal, would you mind testing the following patch? > > > > diff --git a/fs/inode.c b/fs/inode.c > > index 00b804e..48eafa6 100644 > > --- a/fs/inode.c > > +++ b/fs/inode.c > > @@ -419,6 +419,8 @@ void inode_add_lru(struct inode *inode) > > > > static void inode_lru_list_del(struct inode *inode) > > { > > + if (inode->i_state & I_FREEING) > > + return; > > > > if (list_lru_del(&inode->i_sb->s_inode_lru, &inode->i_lru)) > > this_cpu_dec(nr_unused); > > @@ -609,8 +611,8 @@ void evict_inodes(struct super_block *sb) > > continue; > > } > > > > - inode->i_state |= I_FREEING; > > inode_lru_list_del(inode); > > + inode->i_state |= I_FREEING; > > spin_unlock(&inode->i_lock); > > list_add(&inode->i_lru, &dispose); > > } > > @@ -653,8 +655,8 @@ int invalidate_inodes(struct super_block *sb, bool kill_dirty) > > continue; > > } > > > > - inode->i_state |= I_FREEING; > > inode_lru_list_del(inode); > > + inode->i_state |= I_FREEING; > > spin_unlock(&inode->i_lock); > > list_add(&inode->i_lru, &dispose); > > } > > @@ -1381,9 +1383,8 @@ static void iput_final(struct inode *inode) > > inode->i_state &= ~I_WILL_FREE; > > } > > > > + inode_lru_list_del(inode); > > inode->i_state |= I_FREEING; > > - if (!list_empty(&inode->i_lru)) > > - inode_lru_list_del(inode); > > spin_unlock(&inode->i_lock); > > > > evict(inode); > > No luck. I have this on top of inode_lru_isolate one but still can see And I was lucky enough to hit another BUG_ON with this kernel (the above patch and inode_lru_isolate-fix): [84091.219056] ------------[ cut here ]------------ [84091.220015] kernel BUG at mm/list_lru.c:42! [84091.220015] invalid opcode: 0000 [#1] SMP [84091.220015] Modules linked in: edd nfsv3 nfs_acl nfs fscache lockd sunrpc af_packet bridge stp llc cpufreq_conservative cpufreq_userspace cpufreq_powersave fuse loop dm_mod powernow_k8 tg3 kvm_amd kvm ptp e1000 pps_core shpchp edac_core i2c_amd756 amd_rng pci_hotplug k8temp sg i2c_amd8111 edac_mce_amd serio_raw sr_mod pcspkr cdrom button ohci_hcd ehci_hcd usbcore usb_common processor thermal_sys scsi_dh_emc scsi_dh_rdac scsi_dh_hp_sw scsi_dh ata_generic sata_sil pata_amd [84091.220015] CPU 1 [84091.220015] Pid: 32545, comm: rm Not tainted 3.9.0mmotmdebugging1+ #1472 AMD A8440/WARTHOG [84091.220015] RIP: 0010:[] [] list_lru_del+0xcf/0xe0 [84091.220015] RSP: 0018:ffff88001de85df8 EFLAGS: 00010286 [84091.220015] RAX: ffffffffffffffff RBX: ffff88001e1ce2c0 RCX: 0000000000000002 [84091.220015] RDX: ffff88001e1ce2c8 RSI: ffff8800087f4220 RDI: ffff88001e1ce2c0 [84091.220015] RBP: ffff88001de85e18 R08: 0000000000000000 R09: 0000000000000000 [84091.220015] R10: ffff88001d539128 R11: ffff880018234882 R12: ffff8800087f4220 [84091.220015] R13: ffff88001c68bc40 R14: 0000000000000000 R15: ffff88001de85ea8 [84091.220015] FS: 00007f43adb30700(0000) GS:ffff88001f100000(0000) knlGS:0000000000000000 [84091.220015] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [84091.220015] CR2: 0000000001ffed30 CR3: 000000001e02e000 CR4: 00000000000007e0 [84091.220015] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [84091.220015] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [84091.220015] Process rm (pid: 32545, threadinfo ffff88001de84000, task ffff88001c22e5c0) [84091.220015] Stack: [84091.220015] ffff8800087f4130 ffff8800087f41b8 ffff88001c68b800 0000000000000000 [84091.220015] ffff88001de85e48 ffffffff81184357 ffff88001de85e48 ffff8800087f4130 [84091.220015] ffff88001e005000 ffff880014e4eb40 ffff88001de85e68 ffffffff81184418 [84091.220015] Call Trace: [84091.220015] [] iput_final+0x117/0x190 [84091.220015] [] iput+0x48/0x60 [84091.220015] [] do_unlinkat+0x214/0x240 [84091.220015] [] sys_unlinkat+0x1d/0x40 [84091.220015] [] system_call_fastpath+0x16/0x1b [84091.220015] Code: 5c 41 5d b8 01 00 00 00 41 5e c9 c3 49 8d 45 08 f0 45 0f b3 75 08 eb db 0f 1f 40 00 66 83 03 01 5b 41 5c 41 5d 31 c0 41 5e c9 c3 <0f> 0b eb fe 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 ba 00 00 [84091.220015] RIP [] list_lru_del+0xcf/0xe0 [84091.220015] RSP [84091.470390] ---[ end trace e6915e8ee0f5f079 ]--- Which is BUG_ON(nlru->nr_items < 0) from iput_final path. So it seems that there is still a race there. -- Michal Hocko SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/