Issue

• Crash with following log:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
IP: [<ffffffff81079d42>] dup_mm+0x272/0x520
PGD 404edde067 PUD 404f5b2067 PMD 0 
Oops: 0000 [#1] SMP 

Pid: 33631, comm: rhsmcertd-worke Not tainted 2.6.32-696.3.1.el6.x86_64 #1 HP ProLiant XL170r Gen9/ProLiant XL170r Gen9
RIP: 0010:[<ffffffff81079d42>]  [<ffffffff81079d42>] dup_mm+0x272/0x520
RSP: 0018:ffff88404c523d70  EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88404c6c7700 RCX: 0000000000000000
RDX: ffff882050740e80 RSI: ffff88204c794c78 RDI: ffff88404ed2d530
RBP: ffff88404c523de0 R08: ffff882050d340c0 R09: 0000000000000000
R10: 00007fb777d01000 R11: ffff88404eca46e8 R12: ffff88404ed2dc50
R13: ffff88404ed2d530 R14: ffff88204c794c78 R15: ffff88404ed2dc38
FS:  00007fb782286700(0000) GS:ffff8820f0dc0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000010 CR3: 000000404d271000 CR4: 00000000001407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Process rhsmcertd-worke (pid: 33631, threadinfo ffff88404c520000, task ffff88404eac4040)
Stack:
 00000000000000d0 0000000000000000 ffff88404c6c7768 ffff88404fb38c68
<d> ffff88404fb38c00 ffff88404ed2dc70 ffff88404ed2dc78 0000000000000000
<d> 00007fb7822869d0 0000000001200011 ffff88404cf89520 0000000000000000
Call Trace:
 [<ffffffff8107b112>] copy_process+0xe12/0x1520
 [<ffffffff8107b8b6>] do_fork+0x96/0x4c0
 [<ffffffff811ba222>] ? alloc_fd+0x92/0x160
 [<ffffffff81196997>] ? fd_install+0x47/0x90
 [<ffffffff81009598>] sys_clone+0x28/0x30
 [<ffffffff8100b3f3>] stub_clone+0x13/0x20
 [<ffffffff8100b0d2>] ? system_call_fastpath+0x16/0x1b
Code: 49 8b 45 30 49 8b 95 98 00 00 00 49 c7 45 20 00 00 00 00 49 c7 45 18 00 00 00 00 80 e4 df 48 85 d2 49 89 45 30 74 6c 48 8b 42 18 <48> 8b 48 10 48 8b 82 b8 00 00 00 f0 48 ff 42 30 41 f6 45 31 08 
RIP  [<ffffffff81079d42>] dup_mm+0x272/0x520
 RSP <ffff88404c523d70>
CR2: 0000000000000010

• Another Pattern

RIP  [<ffffffff81140dd8>] free_pcppages_bulk+0x318/0x470
 RSP <ffff880434b9bb68>
CR2: ffffffff0042cdd8

• Another Pattern.

[14383470.908355] WARNING: CPU: 20 PID: 186113 at mm/mmap.c:3031 exit_mmap+0x196/0x1a0
BUG: Bad rss-counter state mm:ffff881fbe5a3200 idx:0 val:1209
BUG: Bad rss-counter state mm:ffff881fbe5a3200 idx:1 val:2865
BUG: unable to handle kernel paging request at 0000000000400000
IP: [<ffffffff810864c7>] dup_mm+0x237/0x6f0
PGD 8000005fbeae4067 PUD 5fbc697067 PMD 5fb863d067 PTE 5fb9c7c025
Oops: 0003 [#1] SMP