root@master32:~/linux-3.16.7-ckt25# scripts/decode_stacktrace.sh /usr/lib/debug/boot/vmlinux-3.16.0-ucs193-amd64 . /usr/lib/debug//lib/modules/3.16.0-ucs193-amd64 < 2016-08-23-crash-nfs.txt
[2797715.486604] ------------[ cut here ]------------
[2797715.490524] kernel BUG at /var/build/temp/tmp.BPql4ErveJ/pbuilder/linux-3.16.7-ckt25/fs/dcache.c:2800!
[2797715.490524] invalid opcode: 0000 [#1] SMP
[2797715.490524] Modules linked in: nfsv3 nfsv4 dns_resolver btrfs raid6_pq xor crc32c_generic ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi rpcsec_gss_krb5 nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc quota_v2 quota_tree lpc_ich mfd_core rng_core psmouse i2c_i801 i2c_core processor serio_raw pcspkr tpm_tis tpm shpchp e752x_edac edac_core thermal_sys evdev ext4 jbd2 crc16 dm_snapshot dm_bufio dm_mirror dm_region_hash dm_log dm_mod sd_mod crc_t10dif crct10dif_common sg sr_mod cdrom ata_generic ata_piix uhci_hcd ehci_pci libata ehci_hcd mptspi e1000 mptscsih mptbase floppy usbcore button usb_common scsi_transport_spi
[2797715.490524] CPU: 1 PID: 25372 Comm: nfsd Not tainted 3.16.0-ucs193-amd64 #1 Debian 3.16.7-ckt25-2~bpo70+1~ucs3.3.193.201604181018
[2797715.490524] Hardware name: FUJITSU SIEMENS PRIMERGY RX200S2/D1790/M73IL, BIOS 6.0 Rev. R04A5F5.1790 01/16/2006
[2797715.490524] task: ffff8800d05273f0 ti: ffff8800d0738000 task.ti: ffff8800d0738000
[2797715.490524] RIP: d_materialise_unique (fs/dcache.c:2800)
[2797715.490524] RSP: 0018:ffff8800d073bc18  EFLAGS: 00010286
[2797715.490524] RAX: ffff880074f37198 RBX: ffff880064bdb1a0 RCX: 0000000100140014
[2797715.490524] RDX: 0000000000140014 RSI: ffff880064bdb1a0 RDI: ffff880074f371f0
[2797715.490524] RBP: ffff880074f37198 R08: ffffffffffff0000 R09: 0000000000000002
[2797715.490524] R10: ffff8800163f9ee0 R11: a093fa00db000000 R12: ffff8800b7a64198
[2797715.490524] R13: ffff88004f73e618 R14: 0000000000000022 R15: ffff880104ae50c4
[2797715.490524] FS:  0000000000000000(0000) GS:ffff880127c80000(0000) knlGS:0000000000000000
[2797715.490524] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[2797715.490524] CR2: 00007fed4c82a000 CR3: 00000000c989a000 CR4: 00000000000007e0
[2797715.490524] Stack:
[2797715.490524]  ffff8800d073bc97 ffff8800b7a64198 ffff88004f73e618 ffff8800b7a64198
[2797715.490524]  ffff88004f73e618 ffff88004f73e618 ffff88004f73e618 0000000000000022
[2797715.490524]  ffff880104ae50c4 ffffffff811c44f9 ffff88004f73e618 ffff88004f73e618
[2797715.490524] Call Trace:
[2797715.490524] ? lookup_real (fs/namei.c:1362)
[2797715.490524] ? __lookup_hash (fs/namei.c:1380)
[2797715.490524] ? lookup_one_len (fs/namei.c:2158)
[2797715.490524] ? nfsd_lookup_dentry (fs/nfsd/vfs.c:218) nfsd
[2797715.490524] ? nfsd_lookup (fs/nfsd/vfs.c:263) nfsd
[2797715.490524] ? nfsd4_proc_compound (fs/nfsd/nfs4proc.c:1362) nfsd
[2797715.490524] ? nfsd_dispatch (fs/nfsd/nfssvc.c:638 fs/nfsd/nfssvc.c:690) nfsd
[2797715.490524] ? svc_process_common (net/sunrpc/svc.c:1206) sunrpc
[2797715.490524] ? nfsd_destroy (fs/nfsd/nfssvc.c:566) nfsd
[2797715.490524] ? svc_process (net/sunrpc/svc.c:1331) sunrpc
[2797715.490524] ? nfsd (fs/nfsd/nfssvc.c:612) nfsd
[2797715.490524] ? kthread (kernel/kthread.c:207)
[2797715.490524] ? flush_kthread_worker (kernel/kthread.c:176)
[2797715.490524] ? ret_from_fork (arch/x86/kernel/entry_64.S:352)
[2797715.490524] ? flush_kthread_worker (kernel/kthread.c:176)
[2797715.490524] Code: 63 00 01 66 83 05 c2 86 63 00 01 48 89 ef e8 b6 e6 ff ff e9 26 fd ff ff 49 c7 c6 f0 ff ff ff 31 c0 4c 89 f5 e9 68 fe ff ff 0f 0b <0f> 0b 48 c7 c6 00 31 62 81 48 c7 c7 c0 16 87 81 e8 59 b4 10 00
All code
========
   0:   63 00                   movslq (%rax),%eax
   2:   01 66 83                add    %esp,-0x7d(%rsi)
   5:   05 c2 86 63 00          add    $0x6386c2,%eax
   a:   01 48 89                add    %ecx,-0x77(%rax)
   d:   ef                      out    %eax,(%dx)
   e:   e8 b6 e6 ff ff          callq  0xffffffffffffe6c9
  13:   e9 26 fd ff ff          jmpq   0xfffffffffffffd3e
  18:   49 c7 c6 f0 ff ff ff    mov    $0xfffffffffffffff0,%r14
  1f:   31 c0                   xor    %eax,%eax
  21:   4c 89 f5                mov    %r14,%rbp
  24:   e9 68 fe ff ff          jmpq   0xfffffffffffffe91
  29:   0f 0b                   ud2
  2b:*  0f 0b                   ud2             <-- trapping instruction
  2d:   48 c7 c6 00 31 62 81    mov    $0xffffffff81623100,%rsi
  34:   48 c7 c7 c0 16 87 81    mov    $0xffffffff818716c0,%rdi
  3b:   e8 59 b4 10 00          callq  0x10b499

Code starting with the faulting instruction
===========================================
   0:   0f 0b                   ud2
   2:   48 c7 c6 00 31 62 81    mov    $0xffffffff81623100,%rsi
   9:   48 c7 c7 c0 16 87 81    mov    $0xffffffff818716c0,%rdi
  10:   e8 59 b4 10 00          callq  0x10b46e
[2797715.490524] RIP d_materialise_unique (fs/dcache.c:2800)
[2797715.490524]  RSP <ffff8800d073bc18>
[2797716.023396] ---[ end trace 0f5bdb108fcfc1de ]---