>-----Original Message-----
>From: netdev-ow...@vger.kernel.org [mailto:netdev-ow...@vger.kernel.org] On
>Behalf Of Jakub Kicinski
>Sent: Monday, October 17, 2016 10:20 PM
>To: Andy Adamson <and...@netapp.com>; Anna Schumaker
><anna.schuma...@netapp.com>; linux-...@vger.kernel.org
>Cc: netdev@vger.kernel.org; Trond Myklebust <trond.mykleb...@netapp.com>
>Subject: nfs NULL-dereferencing in net-next
>
>Hi!
>
>I'm hitting this reliably on net-next, HEAD at 3f3177bb680f
>("fsl/fman: fix error return code in mac_probe()").
I see the same thing. It happens constantly on some of my machines, making them
completely unusable.
I bisected it and got to the commit:
commit 04ea1b3e6d8ed4978bb608c1748530af3de8c274
Author: Andy Adamson <and...@netapp.com>
Date: Fri Sep 9 09:22:27 2016 -0400
NFS add xprt switch addrs test to match client
Signed-off-by: Andy Adamson <and...@netapp.com>
Signed-off-by: Anna Schumaker <anna.schuma...@netapp.com>
>
>[ 23.409633] BUG: unable to handle kernel NULL pointer dereference at
>0000000000000172
>[ 23.418716] IP: [<ffffffffc041776c>] rpc_clnt_xprt_switch_has_addr+0xc/0x40
>[sunrpc]
>[ 23.427574] PGD 859020067 [ 23.430472] PUD 858f2d067
>PMD 0 [ 23.434311]
>[ 23.436133] Oops: 0000 [#1] PREEMPT SMP
>[ 23.440506] Modules linked in: nfsv4 ip6table_filter ip6_tables
>iptable_filter
>ip_tables ebtable_nat ebtables x_tables intel_ri
>[ 23.505915] CPU: 1 PID: 1067 Comm: mount.nfs Not tainted 4.8.0-perf-13951-
>g3f3177bb680f #51
>[ 23.515363] Hardware name: Dell Inc. PowerEdge T630/0W9WXC, BIOS 1.2.10
>03/10/2015
>[ 23.523937] task: ffff983e9086ea00 task.stack: ffffac6c0a57c000
>[ 23.530641] RIP: 0010:[<ffffffffc041776c>] [<ffffffffc041776c>]
>rpc_clnt_xprt_switch_has_addr+0xc/0x40 [sunrpc]
>[ 23.542229] RSP: 0018:ffffac6c0a57fb28 EFLAGS: 00010a97
>[ 23.548255] RAX: 00000000c80214ac RBX: ffff983e97c7b000 RCX:
>ffff983e9b3bc180
>[ 23.556320] RDX: 0000000000000001 RSI: ffff983e9928ed28 RDI:
>ffffffffffffffea
>[ 23.564386] RBP: ffffac6c0a57fb38 R08: ffff983e97090630 R09:
>ffff983e9928ed30
>[ 23.572452] R10: ffffac6c0a57fba0 R11: 0000000000000010 R12:
>ffffac6c0a57fba0
>[ 23.580517] R13: ffff983e9928ed28 R14: 0000000000000000 R15:
>ffff983e91360560
>[ 23.588585] FS: 00007f4c348aa880(0000) GS:ffff983e9f240000(0000)
>knlGS:0000000000000000
>[ 23.597742] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>[ 23.604251] CR2: 0000000000000172 CR3: 0000000850a5f000 CR4:
>00000000001406e0
>[ 23.612316] Stack:
>[ 23.614648] ffff983e97c7b000 ffffac6c0a57fba0 ffffac6c0a57fb90
>ffffffffc04d38c3
>[ 23.623331] ffff983e91360500 ffff983e9928ed30 ffffffffc0b9e560
>ffff983e913605b8
>[ 23.632016] ffff983e9882e800 ffff983e9882e800 ffffac6c0a57fc30
>ffffac6c0a57fdb8
>[ 23.640706] Call Trace:
>[ 23.643535] [<ffffffffc04d38c3>] nfs_get_client+0x123/0x340 [nfs]
>[ 23.650542] [<ffffffffc0b8f070>] nfs4_set_client+0x80/0xb0 [nfsv4]
>[ 23.657642] [<ffffffffc0b90305>] nfs4_create_server+0x115/0x2a0 [nfsv4]
>[ 23.665230] [<ffffffffc0b888ce>] nfs4_remote_mount+0x2e/0x60 [nfsv4]
>[ 23.672519] [<ffffffffba1e590a>] mount_fs+0x3a/0x160
>[ 23.678254] [<ffffffffba201a5e>] ? alloc_vfsmnt+0x19e/0x230
>[ 23.684669] [<ffffffffba201b57>] vfs_kern_mount+0x67/0x110
>[ 23.690990] [<ffffffffc0b887f4>] nfs_do_root_mount+0x84/0xc0 [nfsv4]
>[ 23.698284] [<ffffffffc0b88b97>] nfs4_try_mount+0x37/0x50 [nfsv4]
>[ 23.705287] [<ffffffffc04dfbd1>] nfs_fs_mount+0x2d1/0xa70 [nfs]
>[ 23.712092] [<ffffffffba3a6228>] ? find_next_bit+0x18/0x20
>[ 23.718413] [<ffffffffc04deac0>] ? nfs_remount+0x3c0/0x3c0 [nfs]
>[ 23.725316] [<ffffffffc04dedb0>] ? nfs_clone_super+0x130/0x130 [nfs]
>[ 23.732606] [<ffffffffba1e590a>] mount_fs+0x3a/0x160
>[ 23.738340] [<ffffffffba201a5e>] ? alloc_vfsmnt+0x19e/0x230
>[ 23.744755] [<ffffffffba201b57>] vfs_kern_mount+0x67/0x110
>[ 23.751071] [<ffffffffba2041df>] do_mount+0x1bf/0xc70
>[ 23.756904] [<ffffffffba203e9b>] ? copy_mount_options+0xbb/0x220
>[ 23.763803] [<ffffffffba204fa3>] SyS_mount+0x83/0xd0
>[ 23.769538] [<ffffffffba6f1ea4>] entry_SYSCALL_64_fastpath+0x17/0x98
>[ 23.776817] Code: 01 00 48 8b 93 f8 04 00 00 44 89 e6 48 c7 c7 98 b2 43 c0
>e8 9f 0d d4
>f9 eb c0 0f 1f 44 00 00 0f 1f 44 00 00
>[ 23.802909] RIP [<ffffffffc041776c>] rpc_clnt_xprt_switch_has_addr+0xc/0x40
>[sunrpc]
>[ 23.811857] RSP <ffffac6c0a57fb28>
>[ 23.815839] CR2: 0000000000000172
>[ 23.819629] ---[ end trace 9958eca92c9eeafe ]---
>[ 23.827345] note: mount.nfs[1067] exited with preempt_count 1
