From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: linux-nfs-owner@vger.kernel.org Received: from smtp.opengridcomputing.com ([72.48.136.20]:60115 "EHLO smtp.opengridcomputing.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757785Ab3BFW2J (ORCPT ); Wed, 6 Feb 2013 17:28:09 -0500 Message-ID: <5112D903.9010601@opengridcomputing.com> Date: Wed, 06 Feb 2013 16:28:19 -0600 From: Steve Wise MIME-Version: 1.0 To: "J. Bruce Fields" CC: Yan Burman , linux-nfs@vger.kernel.org, linux-rdma@vger.kernel.org, Or Gerlitz , Tom Tucker Subject: Re: NFS over RDMA crashing References: <51127B3F.2090200@mellanox.com> <20130206222435.GL16417@fieldses.org> In-Reply-To: <20130206222435.GL16417@fieldses.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-nfs-owner@vger.kernel.org List-ID: On 2/6/2013 4:24 PM, J. Bruce Fields wrote: > On Wed, Feb 06, 2013 at 05:48:15PM +0200, Yan Burman wrote: >> When killing mount command that got stuck: >> ------------------------------------------- >> >> BUG: unable to handle kernel paging request at ffff880324dc7ff8 >> IP: [] rdma_read_xdr+0x8bb/0xd40 [svcrdma] >> PGD 1a0c063 PUD 32f82e063 PMD 32f2fd063 PTE 8000000324dc7161 >> Oops: 0003 [#1] PREEMPT SMP >> Modules linked in: md5 ib_ipoib xprtrdma svcrdma rdma_cm ib_cm iw_cm >> ib_addr nfsd exportfs netconsole ip6table_filter ip6_tables >> iptable_filter ip_tables ebtable_nat nfsv3 nfs_acl ebtables x_tables >> nfsv4 auth_rpcgss nfs lockd autofs4 sunrpc target_core_iblock >> target_core_file target_core_pscsi target_core_mod configfs 8021q >> bridge stp llc ipv6 dm_mirror dm_region_hash dm_log vhost_net >> macvtap macvlan tun uinput iTCO_wdt iTCO_vendor_support kvm_intel >> kvm crc32c_intel microcode pcspkr joydev i2c_i801 lpc_ich mfd_core >> ehci_pci ehci_hcd sg ioatdma ixgbe mdio mlx4_ib ib_sa ib_mad ib_core >> mlx4_en mlx4_core igb hwmon dca ptp pps_core button dm_mod ext3 jbd >> sd_mod ata_piix libata uhci_hcd megaraid_sas scsi_mod >> CPU 6 >> Pid: 4744, comm: nfsd Not tainted 3.8.0-rc5+ #4 Supermicro >> X8DTH-i/6/iF/6F/X8DTH >> RIP: 0010:[] [] >> rdma_read_xdr+0x8bb/0xd40 [svcrdma] >> RSP: 0018:ffff880324c3dbf8 EFLAGS: 00010297 >> RAX: ffff880324dc8000 RBX: 0000000000000001 RCX: ffff880324dd8428 >> RDX: ffff880324dc7ff8 RSI: ffff880324dd8428 RDI: ffffffff81149618 >> RBP: ffff880324c3dd78 R08: 000060f9c0000860 R09: 0000000000000001 >> R10: ffff880324dd8000 R11: 0000000000000001 R12: ffff8806299dcb10 >> R13: 0000000000000003 R14: 0000000000000001 R15: 0000000000000010 >> FS: 0000000000000000(0000) GS:ffff88063fc00000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b >> CR2: ffff880324dc7ff8 CR3: 0000000001a0b000 CR4: 00000000000007e0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 >> Process nfsd (pid: 4744, threadinfo ffff880324c3c000, task ffff880330550000) >> Stack: >> ffff880324c3dc78 ffff880324c3dcd8 0000000000000282 ffff880631cec000 >> ffff880324dd8000 ffff88062ed33040 0000000124c3dc48 ffff880324dd8000 >> ffff88062ed33058 ffff880630ce2b90 ffff8806299e8000 0000000000000003 >> Call Trace: >> [] svc_rdma_recvfrom+0x3ee/0xd80 [svcrdma] >> [] ? try_to_wake_up+0x2f0/0x2f0 >> [] svc_recv+0x3ef/0x4b0 [sunrpc] >> [] ? nfsd_svc+0x740/0x740 [nfsd] >> [] nfsd+0xad/0x130 [nfsd] >> [] ? nfsd_svc+0x740/0x740 [nfsd] >> [] kthread+0xd6/0xe0 >> [] ? __init_kthread_worker+0x70/0x70 >> [] ret_from_fork+0x7c/0xb0 >> [] ? __init_kthread_worker+0x70/0x70 >> Code: 63 c2 49 8d 8c c2 18 02 00 00 48 39 ce 77 e1 49 8b 82 40 0a 00 >> 00 48 39 c6 0f 84 92 f7 ff ff 90 48 8d 50 f8 49 89 92 40 0a 00 00 >> <48> c7 40 f8 00 00 00 00 49 8b 82 40 0a 00 00 49 3b 82 30 0a 00 >> RIP [] rdma_read_xdr+0x8bb/0xd40 [svcrdma] >> RSP >> CR2: ffff880324dc7ff8 >> ---[ end trace 06d0384754e9609a ]--- >> >> >> It seems that commit afc59400d6c65bad66d4ad0b2daf879cbff8e23e >> "nfsd4: cleanup: replace rq_resused count by rq_next_page pointer" >> is responsible for the crash (it seems to be crashing in >> net/sunrpc/xprtrdma/svc_rdma_recvfrom.c:527) >> It may be because I have CONFIG_DEBUG_SET_MODULE_RONX and >> CONFIG_DEBUG_RODATA enabled. I did not try to disable them yet. >> >> When I moved to commit 79f77bf9a4e3dd5ead006b8f17e7c4ff07d8374e I >> was no longer getting the server crashes, >> so the reset of my tests were done using that point (it is somewhere >> in the middle of 3.7.0-rc2). > OK, so this part's clearly my fault--I'll work on a patch, but the > rdma's use of the ->rq_pages array is pretty confusing. Maybe Tom can shed some light?