>-----Original Message----- >From: netdev-owner@xxxxxxxxxxxxxxx [mailto:netdev-owner@xxxxxxxxxxxxxxx] On >Behalf Of Jakub Kicinski >Sent: Monday, October 17, 2016 10:20 PM >To: Andy Adamson <andros@xxxxxxxxxx>; Anna Schumaker ><Anna.Schumaker@xxxxxxxxxx>; linux-nfs@xxxxxxxxxxxxxxx >Cc: netdev@xxxxxxxxxxxxxxx; Trond Myklebust <Trond.Myklebust@xxxxxxxxxx> >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 <andros@xxxxxxxxxx> Date: Fri Sep 9 09:22:27 2016 -0400 NFS add xprt switch addrs test to match client Signed-off-by: Andy Adamson <andros@xxxxxxxxxx> Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx> > >[ 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 -- 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
