I am running some code related to memory registration on linux kernel: 2.6.9-42.ELsmp
I am allocating and registering memory in loop and have checked for every error condition during the allocation and registration of memory.
Still, I am getting this error and then kernel panic.
Pleas, give some clue, why it is coming and how to solve it...

ERROR is blow:

mm/memory.c:110: bad pmd 000001012b261ac0(ffffffff80467658).
mm/memory.c:110: bad pmd 000001012b261ad0(0000000000000100).
mm/memory.c:110: bad pmd 000001012b261ad8(0000010135bac4c0).
mm/memory.c:110: bad pmd 000001012b261ae0(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261ae8(000001012b5927f0).
mm/memory.c:110: bad pmd 000001012b261af0(0000010135bac4c0).
mm/memory.c:110: bad pmd 000001012b261af8(000001012b5927f0).
mm/memory.c:110: bad pmd 000001012b261b00(000001000104c7e0).
mm/memory.c:110: bad pmd 000001012b261b08(000001000105c7e0).
mm/memory.c:110: bad pmd 000001012b261b10(ffffffff8030a0f5).
mm/memory.c:110: bad pmd 000001012b261b18(0000010135bac4c0).
mm/memory.c:110: bad pmd 000001012b261b20(ffffffff8030a1b6).
mm/memory.c:110: bad pmd 000001012b261b28(0000010005d1e030).
mm/memory.c:110: bad pmd 000001012b261b50(0000000100000000).
mm/memory.c:110: bad pmd 000001012b261b58(000001012b5927f0).
mm/memory.c:110: bad pmd 000001012b261b60(000000000032a136).
mm/memory.c:110: bad pmd 000001012b261b68(0000072e2b6d8dd2).
mm/memory.c:110: bad pmd 000001012b261b70(0000010005d1e030).
mm/memory.c:110: bad pmd 000001012b261b78(000001012b261be8).
mm/memory.c:110: bad pmd 000001012b261b80(ffffffff80132155).
mm/memory.c:110: bad pmd 000001012b261b88(0000000000000008).
mm/memory.c:110: bad pmd 000001012b261b98(0000000100750fb1).
mm/memory.c:110: bad pmd 000001012b261ba0(0000000000000009).
mm/memory.c:110: bad pmd 000001012b261ba8(00000000000025b2).
mm/memory.c:110: bad pmd 000001012b261bb0(0000000000000202).
mm/memory.c:110: bad pmd 000001012b261bb8(0000000000000202).
mm/memory.c:110: bad pmd 000001012b261bc8(0000072e2be54fad).
mm/memory.c:110: bad pmd 000001012b261bd0(0000010005dc4030).
mm/memory.c:110: bad pmd 000001012b261bd8(00000100010447e0).
mm/memory.c:110: bad pmd 000001012b261be8(000001012b261c18).
mm/memory.c:110: bad pmd 000001012b261bf0(ffffffff801321e3).
mm/memory.c:110: bad pmd 000001012b261bf8(00000100010447e0).
mm/memory.c:110: bad pmd 000001012b261c00(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261c08(0000010005dc4030).
mm/memory.c:110: bad pmd 000001012b261c18(0000000000000016).
mm/memory.c:110: bad pmd 000001012b261c20(ffffffff8013271e).
mm/memory.c:110: bad pmd 000001012b261c28(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261c30(00000100010447e0).
mm/memory.c:110: bad pmd 000001012b261c38(00000100010447e0).
mm/memory.c:110: bad pmd 000001012b261c40(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261c48(0000000100000246).
mm/memory.c:110: bad pmd 000001012b261c50(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261c58(0000000000000016).
mm/memory.c:110: bad pmd 000001012b261c60(0000010136cd1e88).
mm/memory.c:110: bad pmd 000001012b261c68(ffffffff803e1ee0).
mm/memory.c:110: bad pmd 000001012b261c78(ffffffff803e1ee8).
mm/memory.c:110: bad pmd 000001012b261c88(000001012b261cd8).
mm/memory.c:110: bad pmd 000001012b261c90(ffffffff8013575b).
mm/memory.c:110: bad pmd 000001012b261c98(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261ca0(ffffffff80133dfa).
mm/memory.c:110: bad pmd 000001012b261ca8(0000000100000000).
mm/memory.c:110: bad pmd 000001012b261cb0(ffffffff803e1ee0).
mm/memory.c:110: bad pmd 000001012b261cc0(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261cc8(0000000000000246).
mm/memory.c:110: bad pmd 000001012b261cd0(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261cd8(000001012b261d18).
mm/memory.c:110: bad pmd 000001012b261ce0(ffffffff80133e50).
mm/memory.c:110: bad pmd 000001012b261ce8(ffffffffa026b517).
mm/memory.c:110: bad pmd 000001012b261cf0(ffffffff80467e1f).
mm/memory.c:110: bad pmd 000001012b261cf8(ffffffffa026b517).
mm/memory.c:110: bad pmd 000001012b261d00(000000000000001f).
mm/memory.c:110: bad pmd 000001012b261d08(000001012b3eb000).
mm/memory.c:110: bad pmd 000001012b261d18(0000000000000246).
mm/memory.c:110: bad pmd 000001012b261d20(ffffffff801384a4).
mm/memory.c:110: bad pmd 000001012b261d28(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261d30(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261d38(000001012b261e50).
mm/memory.c:110: bad pmd 000001012b261d40(0000000000000016).
mm/memory.c:110: bad pmd 000001012b261d48(000001012a000000).
mm/memory.c:110: bad pmd 000001012b261d50(ffffffff8013854e).
mm/memory.c:110: bad pmd 000001012b261d58(0000003000000008).
mm/memory.c:110: bad pmd 000001012b261d60(000001012b261e38).
mm/memory.c:110: bad pmd 000001012b261d68(000001012b261d78).
mm/memory.c:110: bad pmd 000001012b261d70(0000000000000206).
mm/memory.c:110: bad pmd 000001012b261d78(000000d000000246).
mm/memory.c:110: bad pmd 000001012b261d80(0000000000000246).
mm/memory.c:110: bad pmd 000001012b261d88(ffffffff803e1ee8).
mm/memory.c:110: bad pmd 000001012b261d90(ffffffff803e1ee8).
mm/memory.c:110: bad pmd 000001012b261d98(ffffffff803e1ee8).
mm/memory.c:110: bad pmd 000001012b261da0(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261da8(000001000000f680).
mm/memory.c:110: bad pmd 000001012b261db8(000001012b5927f0).
mm/memory.c:110: bad pmd 000001012b261dc0(0000000000000206).
mm/memory.c:110: bad pmd 000001012b261dd0(ffffffffa00ca7f7).
mm/memory.c:110: bad pmd 000001012b261dd8(0000001000000001).
mm/memory.c:110: bad pmd 000001012b261de0(0000000000000206).
mm/memory.c:110: bad pmd 000001012b261de8(00305b2b01010000).
mm/memory.c:110: bad pmd 000001012b261df0(0010000000000000).
mm/memory.c:110: bad pmd 000001012b261df8(000000004c008200).
mm/memory.c:110: bad pmd 000001012b261e00(0000000000000016).
mm/memory.c:110: bad pmd 000001012b261e08(000001012a000000).
mm/memory.c:110: bad pmd 000001012b261e10(000001012b3eb000).
mm/memory.c:110: bad pmd 000001012b261e20(0000000000000001).
mm/memory.c:110: bad pmd 000001012b261e28(000001012b261e50).
mm/memory.c:110: bad pmd 000001012b261e30(ffffffffa0267889).
mm/memory.c:110: bad pmd 000001012b261e38(000000c800000001).
mm/memory.c:110: bad pmd 000001012b261e40(0000001600000001).
mm/memory.c:110: bad pmd 000001012b261e48(000000012b5b3000).
<1>Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
[<0000000000000000>]
PML4 12b031067 PGD 12ed36067 PMD 0
Oops: 0010 [1] SMP
CPU 3
Modules linked in: dbg(U) ib_ipoib(U) parport_pc lp parport md5 ipv6 autofs4 i2c_dev i2c_core nfs lockd nfs_acl sunrpc rdma_ucm(U) rdma_cm(U) ib_addr(U) dsd
Pid: 6843, comm: dbg_fmr_create Tainted: PF 2.6.9-42.ELsmp
RIP: 0010:[<0000000000000000>] [<0000000000000000>]
RSP: 0018:000001012af35ca8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff804c2f00
RBP: ffffffff804c2f00 R08: 0000000000000065 R09: 000001012b3ed000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000002704
R13: ffffffff804725ed R14: 0000000000000006 R15: 000000000000001c
FS: 0000002a9557db00(0000) GS:ffffffff804e5200(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000005da4000 CR4: 00000000000006e0
Process dbg_fmr_create (pid: 6843, threadinfo 000001012af36000, task 000001012b5927f0)
Stack: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
0000000000000000 0000000000000000 0000000000000000 0000000000000000
0000000000000000 0000000000000000
Call Trace:

Code: Bad RIP value.
RIP [<0000000000000000>] RSP <000001012af35ca8>
CR2: 0000000000000000
<0>Kernel panic - not syncing: Oops