On Apr 11, 2014, at 7:51 PM, Devesh Sharma <Devesh.Sharma@xxxxxxxxxx> wrote: > Hi Chuck, > Yes that is the case, Following is the trace I got. > > <4>RPC: 355 setting alarm for 60000 ms > <4>RPC: 355 sync task going to sleep > <4>RPC: xprt_rdma_connect_worker: reconnect > <4>RPC: rpcrdma_ep_disconnect: rdma_disconnect -1 > <4>RPC: rpcrdma_ep_connect: rpcrdma_ep_disconnect status -1 > <3>ocrdma_mbx_create_qp(0) rq_err > <3>ocrdma_mbx_create_qp(0) sq_err > <3>ocrdma_create_qp(0) error=-1 > <4>RPC: rpcrdma_ep_connect: rdma_create_qp failed -1 > <4>RPC: 355 __rpc_wake_up_task (now 4296956756) > <4>RPC: 355 disabling timer > <4>RPC: 355 removed from queue ffff880454578258 "xprt_pending" > <4>RPC: __rpc_wake_up_task done > <4>RPC: xprt_rdma_connect_worker: exit > <4>RPC: 355 sync task resuming > <4>RPC: 355 xprt_connect_status: error 1 connecting to server 192.168.1.1 xprtrdma’s connect worker is returning “1” instead of a negative errno. That’s the bug that triggers this chain of events. RPC tasks waiting for the reconnect are awoken. xprt_connect_status() doesn’t recognize a tk_status of “1”, so it turns it into -EIO, and kills each waiting RPC task. > <4>RPC: wake_up_next(ffff880454578190 "xprt_sending") > <4>RPC: 355 call_connect_status (status -5) > <4>RPC: 355 return 0, status -5 > <4>RPC: 355 release task > <4>RPC: wake_up_next(ffff880454578190 "xprt_sending") > <4>RPC: xprt_rdma_free: called on 0x(null) And as part of exiting, the RPC task has to free its buffer. Not exactly sure why req->rl_nchunks is not zero for an NFSv4 GETATTR. This is why rpcrdma_deregister_external() is invoked here. Eventually this gets around to attempting to post a LOCAL_INV WR with ->qp set to NULL, and the panic below occurs. But xprtrdma has gone off the rails well before this (see above). I’ll look at this more on Monday. > <1>BUG: unable to handle kernel NULL pointer dereference at (null) > <1>IP: [<ffffffffa05b68ac>] rpcrdma_deregister_frmr_external+0x9c/0xe0 [xprtrdma] > <4>PGD 454554067 PUD 4665b7067 PMD 0 > <4>Oops: 0000 [#1] SMP > <4>last sysfs file: /sys/devices/pci0000:00/0000:00:03.0/0000:03:00.0/infiniband/ocrdma0/fwerr > <4>CPU 6 > <4>Modules linked in: xprtrdma(U) nfs lockd fscache auth_rpcgss nfs_acl ocrdma(U) be2net(U) ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle iptable_filter ip_tables bridge stp llc autofs4 des_generic ecb md4 nls_utf8 cifs sunrpc rdma_ucm(U) rdma_cm(U) iw_cm(U) ib_addr(U) ib_ipoib(U) ib_cm(U) ib_sa(U) ipv6 ib_uverbs(U) ib_umad(U) iw_nes(U) libcrc32c iw_cxgb4(U) cxgb4(U) iw_cxgb3(U) cxgb3(U) mdio ib_qib(U) mlx4_en(U) mlx4_ib(U) mlx4_core(U) ib_mthca(U) ib_mad(U) ib_core(U) compat(U) vhost_net macvtap macvlan tun kvm uinput power_meter sg microcode i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support igb ptp pps_core ioatdma dca i7core_edac edac_core ext3 jbd mbcache sr_mod cdrom sd_mod crc_t10dif usb_storage pata_acpi ata_generic ata_piix mptsas mptscsih mptbase scsi_transport_sas dm_mirror dm_region_hash dm_log dm_mod [last unloaded: be2net] > <4> > <4>Pid: 3597, comm: ls Not tainted 2.6.32-358.el6.x86_64 #1 Cisco Systems Inc R210-2121605W/R210-2121605W > <4>RIP: 0010:[<ffffffffa05b68ac>] [<ffffffffa05b68ac>] rpcrdma_deregister_frmr_external+0x9c/0xe0 [xprtrdma] > <4>RSP: 0018:ffff880465aff9a8 EFLAGS: 00010217 > <4>RAX: ffff8804673fcc00 RBX: ffff880466578028 RCX: 0000000000000000 > <4>RDX: ffff880465affa10 RSI: ffff880465aff9a8 RDI: 0000000000000000 > <4>RBP: ffff880465affa38 R08: 0000000000000000 R09: 0000000000000000 > <4>R10: 000000000000000f R11: 000000000000000f R12: ffff880454578598 > <4>R13: ffff880454578000 R14: ffff880466578068 R15: 0000000000000000 > <4>FS: 00007fe61f3107a0(0000) GS:ffff8800368c0000(0000) knlGS:0000000000000000 > <4>CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > <4>CR2: 0000000000000000 CR3: 000000046520a000 CR4: 00000000000007e0 > <4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > <4>DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > <4>Process ls (pid: 3597, threadinfo ffff880465afe000, task ffff8804639a5500) > <4>Stack: > <4> 0000000000000000 ffff880462287370 0000000000000000 0000000a00000000 > <4><d> 0802dd3b00000002 0000000000000000 0000000000000000 0000000000000000 > <4><d> 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > <4>Call Trace: > <4> [<ffffffff8109c97f>] ? up+0x2f/0x50 > <4> [<ffffffffa05b6a03>] rpcrdma_deregister_external+0x113/0x2d0 [xprtrdma] > <4> [<ffffffff8150d0d1>] ? printk+0x41/0x48 > <4> [<ffffffffa05b44fc>] xprt_rdma_free+0x8c/0x210 [xprtrdma] > <4> [<ffffffff81082014>] ? mod_timer+0x144/0x220 > <4> [<ffffffffa05c8a60>] xprt_release+0xc0/0x220 [sunrpc] > <4> [<ffffffffa05cff5d>] rpc_release_resources_task+0x1d/0x50 [sunrpc] > <4> [<ffffffffa05d0a84>] __rpc_execute+0x174/0x350 [sunrpc] > <4> [<ffffffff8150d0d1>] ? printk+0x41/0x48 > <4> [<ffffffff81096b47>] ? bit_waitqueue+0x17/0xd0 > <4> [<ffffffffa05d0cc1>] rpc_execute+0x61/0xa0 [sunrpc] > <4> [<ffffffffa05c73a5>] rpc_run_task+0x75/0x90 [sunrpc] > <4> [<ffffffffa05c74c2>] rpc_call_sync+0x42/0x70 [sunrpc] > <4> [<ffffffff81143a17>] ? handle_pte_fault+0x487/0xb50 > <4> [<ffffffffa074e030>] _nfs4_call_sync+0x30/0x40 [nfs] > <4> [<ffffffffa07461dc>] _nfs4_proc_getattr+0xac/0xc0 [nfs] > <4> [<ffffffffa07494be>] nfs4_proc_getattr+0x4e/0x70 [nfs] > <4> [<ffffffffa072f3e3>] __nfs_revalidate_inode+0xe3/0x220 [nfs] > <4> [<ffffffffa072fdb6>] nfs_getattr+0xb6/0x120 [nfs] > <4> [<ffffffff81186951>] vfs_getattr+0x51/0x80 > <4> [<ffffffff811869e0>] vfs_fstatat+0x60/0x80 > <4> [<ffffffff81186b2b>] vfs_stat+0x1b/0x20 > <4> [<ffffffff81186b54>] sys_newstat+0x24/0x50 > <4> [<ffffffff810dc817>] ? audit_syscall_entry+0x1d7/0x200 > <4> [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b > <4>Code: 48 89 85 78 ff ff ff 48 8b 40 08 8b 40 1c 89 45 94 b8 ff ff ff ff f0 41 0f c1 85 e0 05 00 00 49 8b 04 24 48 8d 55 d8 48 8b 78 10 <48> 8b 07 ff 90 b0 01 00 00 85 c0 89 c3 74 09 80 3d 56 dd 03 00 > <1>RIP [<ffffffffa05b68ac>] rpcrdma_deregister_frmr_external+0x9c/0xe0 [xprtrdma] > <4> RSP <ffff880465aff9a8> > <4>CR2: 0000000000000000 > >> -----Original Message----- >> From: Chuck Lever [mailto:chuck.lever@xxxxxxxxxx] >> Sent: Friday, April 11, 2014 1:24 AM >> To: Devesh Sharma >> Cc: Linux NFS Mailing List; linux-rdma@xxxxxxxxxxxxxxx; Trond Myklebust >> Subject: Re: [PATCH V1] NFS-RDMA: fix qp pointer validation checks >> >> Hi Devesh- >> >> On Apr 10, 2014, at 1:54 PM, Devesh Sharma >> <Devesh.Sharma@xxxxxxxxxx> wrote: >> >>> Alright here it is: >>> >>> <3>ocrdma_mbx_create_qp(0) rq_err >>> <3>ocrdma_mbx_create_qp(0) sq_err >>> <3>ocrdma_create_qp(0) error=-1 >>> <1>BUG: unable to handle kernel NULL pointer dereference at (null) >>> <1>IP: [<ffffffffa078e8ac>] rpcrdma_deregister_frmr_external+0x9c/0xe0 >>> [xprtrdma] >> >> As near as I can ascertain, the RDMA connection is torn down while an NFS >> workload is running, and a new connection cannot be completely set up. >> >> Can you try this: >> >> 1. On your client, # rpcdebug -m rpc -s call xprt sched trans >> >> 2. Reproduce the failure >> >> 3. Post the relevant contents of /var/log/messages (like the last RPC request >> or two before the BUG) >> >> And post the relevant line in /proc/mounts corresponding to your test >> NFS/RDMA mount. >> >> >>> <4>PGD 455942067 PUD 458356067 PMD 0 >>> <4>Oops: 0000 [#1] SMP >>> <4>last sysfs file: >>> /sys/devices/pci0000:80/0000:80:03.0/0000:8b:00.1/class >>> <4>CPU 1 >>> <4>Modules linked in: nfs fscache xprtrdma(U) ocrdma(U) fuse >>> ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE >>> iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state >>> nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle iptable_filter >>> ip_tables bridge nfsd lockd nfs_acl auth_rpcgss exportfs autofs4 >>> sunrpc target_core_iblock target_core_file target_core_pscsi >>> target_core_mod configfs bnx2fc cnic uio fcoe libfcoe 8021q garp libfc >>> stp llc rdma_ucm(U) rdma_cm(U) iw_cm(U) ib_addr(U) ib_ipoib(U) >>> ib_cm(U) ib_sa(U) ipv6 ib_uverbs(U) ib_umad(U) iw_nes(U) libcrc32c >>> iw_cxgb4(U) cxgb4(U) iw_cxgb3(U) cxgb3(U) mdio ib_qib(U) mlx4_en(U) >>> mlx4_ib(U) mlx4_core(U) ib_mthca(U) ib_mad(U) ib_core(U) compat(U) >>> vfat fat vhost_net macvtap macvlan tun kvm_intel kvm uinput sg >>> cdc_ether usbnet mii microcode i2c_i801 i2c_core iTCO_wdt >>> iTCO_vendor_support shpchp igb ptp pps_core ioatdma dca be2net(U) >> ext4 >>> mbcache jbd2 sr_mod cdrom sd_mod crc_t10dif lpfc scsi_transport_fc >>> scsi_tgt ahci wmi megaraid_sas dm_mirror dm_region_hash dm_log >> dm_mod >>> [last unloaded: speedstep_lib] <4> >>> <4>Pid: 9204, comm: ls Not tainted 2.6.32-358.el6.x86_64 #1 IBM System >>> x3650 M4 -[7915AC1]-/00J6528 >>> <4>RIP: 0010:[<ffffffffa078e8ac>] [<ffffffffa078e8ac>] >>> rpcrdma_deregister_frmr_external+0x9c/0xe0 [xprtrdma] >>> <4>RSP: 0018:ffff8804551877f8 EFLAGS: 00010217 >>> <4>RAX: ffff880462243800 RBX: ffff88045646a028 RCX: 0000000000000000 >>> <4>RDX: ffff880455187860 RSI: ffff8804551877f8 RDI: 0000000000000000 >>> <4>RBP: ffff880455187888 R08: 0000000000000000 R09: 0000000000000000 >>> <4>R10: 0000000000000000 R11: 0000000000000000 R12: ffff88047601c598 >>> <4>R13: ffff88047601c000 R14: ffff88045646a068 R15: 0000000000000000 >>> <4>FS: 00007fd669be07a0(0000) GS:ffff880028220000(0000) >>> knlGS:0000000000000000 >>> <4>CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b >>> <4>CR2: 0000000000000000 CR3: 00000004557de000 CR4: 00000000000407e0 >>> <4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>> <4>DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 >>> <4>Process ls (pid: 9204, threadinfo ffff880455186000, task >>> ffff880456735540) >>> <4>Stack: >>> <4> 0000000000000000 ffff88045584a700 0000000000000000 >>> 0000000a00000000 <4><d> 080424b400000002 0000000000000000 >>> 0000000000000000 0000000000000000 <4><d> 0000000000000000 >>> 0000000000000000 0000000000000000 0000000000000000 <4>Call Trace: >>> <4> [<ffffffffa078ea03>] rpcrdma_deregister_external+0x113/0x2d0 >>> [xprtrdma] <4> [<ffffffffa078c4fc>] xprt_rdma_free+0x8c/0x210 >>> [xprtrdma] <4> [<ffffffff81082014>] ? mod_timer+0x144/0x220 <4> >>> [<ffffffffa07bba60>] xprt_release+0xc0/0x220 [sunrpc] <4> >>> [<ffffffffa07c2f5d>] rpc_release_resources_task+0x1d/0x50 [sunrpc] <4> >>> [<ffffffffa07c3a84>] __rpc_execute+0x174/0x350 [sunrpc] <4> >>> [<ffffffff81096b47>] ? bit_waitqueue+0x17/0xd0 <4> >>> [<ffffffffa07c3cc1>] rpc_execute+0x61/0xa0 [sunrpc] <4> >>> [<ffffffffa07ba3a5>] rpc_run_task+0x75/0x90 [sunrpc] <4> >>> [<ffffffffa07ba4c2>] rpc_call_sync+0x42/0x70 [sunrpc] <4> >>> [<ffffffffa08b6f6d>] nfs3_rpc_wrapper.clone.0+0x3d/0xd0 [nfs] <4> >>> [<ffffffffa08b734c>] nfs3_proc_access+0xbc/0x180 [nfs] <4> >>> [<ffffffffa089f1e9>] nfs_do_access+0x199/0x3c0 [nfs] <4> >>> [<ffffffffa07c6305>] ? generic_lookup_cred+0x15/0x20 [sunrpc] <4> >>> [<ffffffffa07c52e0>] ? rpcauth_lookupcred+0x70/0xc0 [sunrpc] <4> >>> [<ffffffffa089f4b8>] nfs_permission+0xa8/0x1e0 [nfs] <4> >>> [<ffffffff8119053d>] __link_path_walk+0xad/0x1030 <4> >>> [<ffffffff81143a17>] ? handle_pte_fault+0x487/0xb50 <4> >>> [<ffffffff8132b1fa>] ? copy_termios+0x6a/0x80 <4> [<ffffffff8119174a>] >>> path_walk+0x6a/0xe0 <4> [<ffffffff8119191b>] >> do_path_lookup+0x5b/0xa0 >>> <4> [<ffffffff811925a7>] user_path_at+0x57/0xa0 <4> >>> [<ffffffff81194ed2>] ? vfs_ioctl+0x22/0xa0 <4> [<ffffffff811869bc>] >>> vfs_fstatat+0x3c/0x80 <4> [<ffffffff81085151>] ? >>> do_sigaction+0x91/0x1d0 <4> [<ffffffff81186b2b>] vfs_stat+0x1b/0x20 >>> <4> [<ffffffff81186b54>] sys_newstat+0x24/0x50 <4> >>> [<ffffffff8151311e>] ? do_page_fault+0x3e/0xa0 <4> >>> [<ffffffff815104d5>] ? page_fault+0x25/0x30 <4> [<ffffffff8100b072>] >>> system_call_fastpath+0x16/0x1b >>> <4>Code: 48 89 85 78 ff ff ff 48 8b 40 08 8b 40 1c 89 45 94 b8 ff ff >>> ff ff f0 41 0f c1 85 e0 05 00 00 49 8b 04 24 48 8d 55 d8 48 8b 78 10 >>> <48> 8b 07 ff 90 b0 01 00 00 85 c0 89 c3 74 09 80 3d 56 8d 05 00 >>> <1>RIP [<ffffffffa078e8ac>] >>> rpcrdma_deregister_frmr_external+0x9c/0xe0 [xprtrdma] <4> RSP >>> <ffff8804551877f8> >>> <4>CR2: 0000000000000000 >>> >>>> -----Original Message----- >>>> From: linux-rdma-owner@xxxxxxxxxxxxxxx [mailto:linux-rdma- >>>> owner@xxxxxxxxxxxxxxx] On Behalf Of Chuck Lever >>>> Sent: Thursday, April 10, 2014 11:21 PM >>>> To: Devesh Sharma >>>> Cc: Linux NFS Mailing List; linux-rdma@xxxxxxxxxxxxxxx; Trond >>>> Myklebust >>>> Subject: Re: [PATCH V1] NFS-RDMA: fix qp pointer validation checks >>>> >>>> >>>> On Apr 10, 2014, at 1:42 PM, Devesh Sharma >> <Devesh.Sharma@xxxxxxxxxx> >>>> wrote: >>>> >>>>>> However it seems to me the new (!ia->ri_id->qp) checks outside the >>>>>> connect logic are unnecessary. >>>>>> >>>>>> Clearly, as you noticed, the ib_post_{send,recv} verbs do not check >>>>>> that their "qp" argument is NULL before dereferencing it. >>>>>> >>>>>> But I don't understand how xprtrdma can post any operation if the >>>>>> transport isn't connected. In other words, how would it be possible >>>>>> to call >>>>>> rpcrdma_ep_post_recv() if the connect had failed and there was no >> QP? >>>>>> >>>>>> If disconnect wipes ia->ri_id->qp while there are still operations >>>>>> in progress, that would be the real bug. >>>>> Yes!, But I have seen one more kernel oops where QP is destroyed and >>>>> xprtrdma still try to post in LOCAL_INV WR on a NULL QP pointer and >>>>> hence >>>> system crashes. So, I think what you missioned is really happening. >>>> >>>> I'd like to see the crash data (back trace, etc), if you've got it. >>>> >>>> -- >>>> Chuck Lever >>>> chuck[dot]lever[at]oracle[dot]com >>>> >>>> >>>> >>>> -- >>>> To unsubscribe from this list: send the line "unsubscribe linux-rdma" >>>> in the body of a message to majordomo@xxxxxxxxxxxxxxx More >> majordomo >>>> info at http://vger.kernel.org/majordomo-info.html >> >> -- >> Chuck Lever >> chuck[dot]lever[at]oracle[dot]com >> >> > -- Chuck Lever chuck[dot]lever[at]oracle[dot]com -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
