On Mon, Jan 26, 2015 at 4:31 AM, Mkrtchyan, Tigran <tigran.mkrtchyan@xxxxxxx> wrote: > we rebooted back into a kernel without the fix an it crashed almost immediately. Thanks Tigran! That sounds pretty conclusive. I'll make sure to push the fix upstream. Cheers Trond > ----- Original Message ----- >> From: "Mkrtchyan, Tigran" <tigran.mkrtchyan@xxxxxxx> >> To: "Trond Myklebust" <trond.myklebust@xxxxxxxxxxxxxxx> >> Cc: "Olga Kornievskaia" <aglo@xxxxxxxxx>, "Linux NFS Mailing List" <linux-nfs@xxxxxxxxxxxxxxx> >> Sent: Saturday, January 24, 2015 10:07:59 PM >> Subject: Re: Yet another kernel crash in NFS4 state recovery > >> Looks like there are no crashes any more. >> >> Tigran. >> >> ----- Original Message ----- >>> From: "Mkrtchyan, Tigran" <tigran.mkrtchyan@xxxxxxx> >>> To: "Trond Myklebust" <trond.myklebust@xxxxxxxxxxxxxxx> >>> Cc: "Olga Kornievskaia" <aglo@xxxxxxxxx>, "Linux NFS Mailing List" >>> <linux-nfs@xxxxxxxxxxxxxxx> >>> Sent: Wednesday, January 21, 2015 9:58:04 PM >>> Subject: Re: Yet another kernel crash in NFS4 state recovery >> >>> Hi Trond, Olga, >>> >>> This is really weird. We had no problem until today. >>> Today is started to crash every 7 minutes or so. >>> >>> I will try the fix tomorrow. But I have idea what have triggered it >>> today. >>> >>> Tigran. >>> >>> ----- Original Message ----- >>>> From: "Trond Myklebust" <trond.myklebust@xxxxxxxxxxxxxxx> >>>> To: "Olga Kornievskaia" <aglo@xxxxxxxxx> >>>> Cc: "Mkrtchyan, Tigran" <tigran.mkrtchyan@xxxxxxx>, "Linux NFS Mailing List" >>>> <linux-nfs@xxxxxxxxxxxxxxx> >>>> Sent: Wednesday, January 21, 2015 8:48:07 PM >>>> Subject: Re: Yet another kernel crash in NFS4 state recovery >>> >>>> On Wed, 2015-01-21 at 14:09 -0500, Olga Kornievskaia wrote: >>>>> On Wed, Jan 21, 2015 at 1:41 PM, Trond Myklebust >>>>> <trond.myklebust@xxxxxxxxxxxxxxx> wrote: >>>>> > On Wed, Jan 21, 2015 at 9:47 AM, Mkrtchyan, Tigran >>>>> > <tigran.mkrtchyan@xxxxxxx> wrote: >>>>> >> >>>>> >> >>>>> >> Now with RHEL7. >>>>> >> >>>>> >> [ 482.016897] BUG: unable to handle kernel NULL pointer dereference at >>>>> >> 000000000000001a >>>>> >> [ 482.017023] IP: [<ffffffffa01d7035>] rpc_peeraddr2str+0x5/0x30 [sunrpc] >>>>> >> [ 482.017023] PGD baefe067 PUD baeff067 PMD 0 >>>>> >> [ 482.017023] Oops: 0000 [#1] SMP >>>>> >> [ 482.017023] Modules linked in: nfs_layout_nfsv41_files rpcsec_gss_krb5 nfsv4 >>>>> >> dns_resolver nfs fscache ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack >>>>> >> ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat >>>>> >> nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security >>>>> >> ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 >>>>> >> nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security >>>>> >> iptable_raw iptable_filter ip_tables sg ppdev kvm_intel kvm pcspkr serio_raw >>>>> >> virtio_balloon i2c_piix4 parport_pc parport mperf nfsd auth_rpcgss nfs_acl >>>>> >> lockd sunrpc sr_mod cdrom ata_generic pata_acpi ext4 mbcache jbd2 virtio_blk >>>>> >> cirrus syscopyarea sysfillrect sysimgblt drm_kms_helper ttm virtio_net ata_piix >>>>> >> drm libata virtio_pci virtio_ring virtio >>>>> >> [ 482.017023] i2c_core floppy >>>>> >> [ 482.017023] CPU: 0 PID: 2834 Comm: xrootd Not tainted >>>>> >> 3.10.0-123.13.2.el7.x86_64 #1 >>>>> >> [ 482.017023] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs >>>>> >> 01/01/2011 >>>>> >> [ 482.017023] task: ffff8800b188cfa0 ti: ffff880232484000 task.ti: >>>>> >> ffff880232484000 >>>>> >> [ 482.017023] RIP: 0010:[<ffffffffa01d7035>] [<ffffffffa01d7035>] >>>>> >> rpc_peeraddr2str+0x5/0x30 [sunrpc] >>>>> >> [ 482.017023] RSP: 0018:ffff880232485708 EFLAGS: 00010246 >>>>> >> [ 482.017023] RAX: 000000000001bcb0 RBX: ffff880233ded800 RCX: 0000000000000000 >>>>> >> [ 482.017023] RDX: ffffffffa0494078 RSI: 0000000000000000 RDI: ffffffffffffffea >>>>> >> [ 482.017023] RBP: ffff880232485760 R08: ffff880232485740 R09: 0000000000000000 >>>>> >> [ 482.017023] R10: 0000000000000000 R11: fffffffffffffff2 R12: ffff8800bac3e690 >>>>> >> [ 482.017023] R13: ffff8800bac3e638 R14: 0000000000000000 R15: 0000000000000000 >>>>> >> [ 482.017023] FS: 00007f0d84b79700(0000) GS:ffff88023fc00000(0000) >>>>> >> knlGS:0000000000000000 >>>>> >> [ 482.017023] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b >>>>> >> [ 482.017023] CR2: 000000000000001a CR3: 00000000baefd000 CR4: 00000000000006f0 >>>>> >> [ 482.017023] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>>>> >> [ 482.017023] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 >>>>> >> [ 482.017023] Stack: >>>>> >> [ 482.017023] ffffffffa04c79a5 0000000000000000 ffff880232485768 >>>>> >> ffffffffa046d858 >>>>> >> [ 482.017023] 0000000000000000 ffff8800b188cfa0 ffffffff81086ac0 >>>>> >> ffff880232485740 >>>>> >> [ 482.017023] ffff880232485740 0000000096605de3 ffff880233ded800 >>>>> >> ffff880232485778 >>>>> >> [ 482.017023] Call Trace: >>>>> >> [ 482.017023] [<ffffffffa04c79a5>] ? nfs4_schedule_state_manager+0x65/0xf0 >>>>> >> [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa046d858>] ? >>>>> >> nfs_wait_client_init_complete.part.6+0x98/0xd0 [nfs] >>>>> >> [ 482.017023] [<ffffffff81086ac0>] ? wake_up_bit+0x30/0x30 >>>>> >> [ 482.017023] [<ffffffffa04c7a5e>] nfs4_schedule_lease_recovery+0x2e/0x60 >>>>> >> [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa04cff64>] nfs41_walk_client_list+0x104/0x340 [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa04c5679>] nfs41_discover_server_trunking+0x39/0x40 >>>>> >> [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa04c7ecd>] nfs4_discover_server_trunking+0x7d/0x2e0 >>>>> >> [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa04cf944>] nfs4_init_client+0x124/0x2f0 [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa0455eb4>] ? __fscache_acquire_cookie+0x74/0x2a0 >>>>> >> [fscache] >>>>> >> [ 482.017023] [<ffffffffa0455eb4>] ? __fscache_acquire_cookie+0x74/0x2a0 >>>>> >> [fscache] >>>>> >> [ 482.017023] [<ffffffffa01e62a5>] ? generic_lookup_cred+0x15/0x20 [sunrpc] >>>>> >> [ 482.017023] [<ffffffffa01e2cc1>] ? __rpc_init_priority_wait_queue+0x81/0xc0 >>>>> >> [sunrpc] >>>>> >> [ 482.017023] [<ffffffffa01e2d33>] ? rpc_init_wait_queue+0x13/0x20 [sunrpc] >>>>> >> [ 482.017023] [<ffffffffa04cf649>] ? nfs4_alloc_client+0x189/0x1e0 [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa046e6ba>] nfs_get_client+0x26a/0x320 [nfs] >>>>> >> [ 482.017023] [<ffffffffa04cee5e>] nfs4_set_ds_client+0x8e/0xe0 [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa0521779>] nfs4_fl_prepare_ds+0xe9/0x298 >>>>> >> [nfs_layout_nfsv41_files] >>>>> >> [ 482.017023] [<ffffffffa051f4c6>] filelayout_read_pagelist+0x56/0x170 >>>>> >> [nfs_layout_nfsv41_files] >>>>> >> [ 482.017023] [<ffffffffa04d6b17>] pnfs_generic_pg_readpages+0xe7/0x270 >>>>> >> [nfsv4] >>>>> >> [ 482.017023] [<ffffffffa047e1c9>] nfs_pageio_doio+0x19/0x50 [nfs] >>>>> >> [ 482.017023] [<ffffffffa047e534>] nfs_pageio_complete+0x24/0x30 [nfs] >>>>> >> [ 482.017023] [<ffffffffa047fd2a>] nfs_readpages+0x16a/0x1d0 [nfs] >>>>> >> [ 482.017023] [<ffffffff81141a67>] ? __page_cache_alloc+0x87/0xb0 >>>>> >> [ 482.017023] [<ffffffff8114da6c>] __do_page_cache_readahead+0x1cc/0x250 >>>>> >> [ 482.017023] [<ffffffff8114dc76>] ondemand_readahead+0x126/0x240 >>>>> >> [ 482.017023] [<ffffffff8114e051>] page_cache_sync_readahead+0x31/0x50 >>>>> >> [ 482.017023] [<ffffffff81142edb>] generic_file_aio_read+0x1ab/0x750 >>>>> >> [ 482.017023] [<ffffffffa0474971>] nfs_file_read+0x71/0xf0 [nfs] >>>>> >> [ 482.017023] [<ffffffff811aee9d>] do_sync_read+0x8d/0xd0 >>>>> >> [ 482.017023] [<ffffffff811af57c>] vfs_read+0x9c/0x170 >>>>> >> [ 482.017023] [<ffffffff811b0242>] SyS_pread64+0x92/0xc0 >>>>> >> [ 482.017023] [<ffffffff815f2a19>] system_call_fastpath+0x16/0x1b >>>>> >> [ 482.017023] Code: c3 0f 1f 44 00 00 0f 1f 44 00 00 55 48 c7 47 50 40 72 1d a0 >>>>> >> 48 89 e5 5d c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <48> 8b 47 >>>>> >> 30 89 f6 55 48 c7 c2 d8 da 1f a0 48 89 e5 48 8b 84 f0 >>>>> >> [ 482.017023] RIP [<ffffffffa01d7035>] rpc_peeraddr2str+0x5/0x30 [sunrpc] >>>>> >> [ 482.017023] RSP <ffff880232485708> >>>>> >> [ 482.017023] CR2: 000000000000001a >>>>> >> >>>>> >> >>>>> >> Looks like clp->cl_rpcclient point to nowhere when nfs4_schedule_state_manager >>>>> >> is called. >>>>> >> >>>>> > >>>>> > I'm guessing >>>>> > >>>>> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=080af20cc945d110f9912d01cf6b66f94a375b8d >>>>> > >>>>> >>>>> The Oops is seen even with that patch. As I was explained, in the >>>>> commit you pointed at the whole client structure is null. In this case >>>>> it's the rpcclient structure that's invalid. >>>> >>>> >>>> Ah. You are right... Tigran, how about the following patch? >>>> >>>> Cheers >>>> Trond >>>> 8<--------------------------------------------------------------------- >>>> From eb8720a31e1d36415c7377f287d5d217540830c3 Mon Sep 17 00:00:00 2001 >>>> From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> >>>> Date: Wed, 21 Jan 2015 14:37:44 -0500 >>>> Subject: [PATCH] NFSv4.1: Fix an Oops in nfs41_walk_client_list >>>> >>>> If we start state recovery on a client that failed to initialise correctly, >>>> then we are very likely to Oops. >>>> >>>> Reported-by: "Mkrtchyan, Tigran" <tigran.mkrtchyan@xxxxxxx> >>>> Link: >>>> http://lkml.kernel.org/r/130621862.279655.1421851650684.JavaMail.zimbra@xxxxxxx >>>> Cc: stable@xxxxxxxxxxxxxxx >>>> Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> >>>> --- >>>> fs/nfs/nfs4client.c | 2 +- >>>> 1 file changed, 1 insertion(+), 1 deletion(-) >>>> >>>> diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c >>>> index 953daa44a282..706ad10b8186 100644 >>>> --- a/fs/nfs/nfs4client.c >>>> +++ b/fs/nfs/nfs4client.c >>>> @@ -639,7 +639,7 @@ int nfs41_walk_client_list(struct nfs_client *new, >>>> prev = pos; >>>> >>>> status = nfs_wait_client_init_complete(pos); >>>> - if (status == 0) { >>>> + if (pos->cl_cons_state == NFS_CS_SESSION_INITING) { >>>> nfs4_schedule_lease_recovery(pos); >>>> status = nfs4_wait_clnt_recover(pos); >>>> } >>>> -- >>>> 2.1.0 >>> -- >>> 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 >> -- >> 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 > -- > 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 -- 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
