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kernel BUG at /usr/src/packages/BUILD/kernel-default-3.0.101/linux-3.0/fs/nfs/nfs4xdr.c:856!

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SUSE Linux Enterprise Server 11 Service Pack 3 (SLES 11 SP3)


Only on systems using NFSv4.1.

After updating to kernel 3.0.101-0.35 the system starts panicking with:
------------[ cut here ]------------
kernel BUG at /usr/src/packages/BUILD/kernel-default-3.0.101/linux-3.0/fs/nfs/nfs4xdr.c:856!

PID: 28 TASK: ffff8800378fa600 CPU: 0 COMMAND: "kworker/0:2" #0 [ffff880037ad7a50] machine_kexec at ffffffff8102c0ae #1 [ffff880037ad7aa0] crash_kexec at ffffffff810ac11a #2 [ffff880037ad7b70] oops_end at ffffffff814637b8 #3 [ffff880037ad7b90] do_invalid_op at ffffffff81003624 #4 [ffff880037ad7c30] invalid_op at ffffffff8146afdb [exception RIP: encode_nops+17] RIP: ffffffffa0498031 RSP: ffff880037ad7ce8 RFLAGS: 00010202 RAX: ffff88003cf89154 RBX: ffff880037ad7d40 RCX: ffff88003cf89154 RDX: 0000000000000009 RSI: 0000000000000010 RDI: ffff880037ad7cf0 RBP: ffff8800234c0008 R8: 64646e69665f746d R9: 0000000000000001 R10: ffff88003cf89131 R11: 676f6c2e6574656c R12: ffff88003ae28320 R13: ffff88003cf89070 R14: ffff8800234c0008 R15: ffffffffa049e2b0 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #5 [ffff880037ad7ce8] nfs4_xdr_enc_open at ffffffffa049e39c [nfs] #6 [ffff880037ad7d38] rpcauth_wrap_req at ffffffffa03eb17c [sunrpc] #7 [ffff880037ad7db8] rpc_xdr_encode at ffffffffa03e1011 [sunrpc] #8 [ffff880037ad7dd8] call_transmit at ffffffffa03e11b8 [sunrpc] #9 [ffff880037ad7de8] __rpc_execute at ffffffffa03ea2b5 [sunrpc] #10 [ffff880037ad7e18] rpc_async_schedule at ffffffffa03ea4ad [sunrpc] #11 [ffff880037ad7e28] process_one_work at ffffffff8107ba0c #12 [ffff880037ad7e78] worker_thread at ffffffff8107e63a #13 [ffff880037ad7ee8] kthread at ffffffff810829a6 #14 [ffff880037ad7f48] kernel_thread_helper at ffffffff8146b164

In doubt what NFS version is being used or available:

If "cat /proc/fs/nfsd/versions"
"+2 +3 +4 +4.1"
NFSv4.1 was enabled and is likely being used.


The kernel update released end of October, kernel 3.0.101-0.40.1 includes the patch to resolve the problem.


A recent change to the 'OPEN' compound in NFSv4 added an 'ACCESS' request to the 'OPEN' compound. This change now needs 9 OPS per request and NFS4_MAX_OPS needed to be adjusted.

Additional Information


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  • Document ID:7015495
  • Creation Date: 07-Aug-2014
  • Modified Date:28-Sep-2022
    • SUSE Linux Enterprise Server

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