Re: [Bugme-new] [Bug 27212] New: Warning kmemcheck: Caught 64-bit read from uninitialized memory in netlink_broadcast_filtered

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On Thu, 20 Jan 2011 20:08:32 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=27212

           Summary: Warning kmemcheck: Caught 64-bit read from
                    uninitialized memory in netlink_broadcast_filtered
           Product: Other
           Version: 2.5
    Kernel Version: 2.6.38-rc1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: other_other@kernel-bugs.osdl.org
        ReportedBy: casteyde.christian@free.fr
        Regression: Yes


Athlon 64 X2 3000 in 64bits
Slackware64 13.1
Kernel compiled with kmemcheck and other debug options

At boot I got the following warning:

PCI: Using ACPI for IRQ routing
PCI: pci_cache_line_size set to 64 bytes
pci 0000:00:00.0: address space collision: [mem 0xe0000000-0xefffffff pref]
conflicts with GART [mem 0x
e0000000-0xefffffff]
reserve RAM buffer: 000000000009fc00 - 000000000009ffff 
reserve RAM buffer: 000000003ffb0000 - 000000003fffffff
WARNING: kmemcheck: Caught 64-bit read from uninitialized memory
(ffff88003e170eb0)
0000000000000000010000000000000000000000000000000000000000000000
 i i i i i i i i i i i i u u u u u u u u u u u u u u u u u u u u
                                 ^

Pid: 1, comm: swapper Not tainted 2.6.38-rc1 #2 K8 Combo-Z/K8 Combo-Z
RIP: 0010:[<ffffffff8127ad72>]  [<ffffffff8127ad72>] memmove+0x122/0x1a0
RSP: 0018:ffff88003e0b3c60  EFLAGS: 00010202
RAX: ffff88003e170080 RBX: ffff88003e27b500 RCX: 0000000000000020
RDX: 0000000000000018 RSI: ffff88003e170ea0 RDI: ffff88003e1700a0
RBP: ffff88003e0b3c60 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000080 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff88003e018abc CR3: 0000000001a1c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
 [<ffffffff814741c2>] pskb_expand_head+0xc2/0x2a0
 [<ffffffff81498fa7>] netlink_broadcast_filtered+0xa7/0x4a0
 [<ffffffff814993b8>] netlink_broadcast+0x18/0x20
 [<ffffffff8149b884>] genlmsg_mcast+0x144/0x180
 [<ffffffff8149bc4a>] genl_ctrl_event+0xca/0x450
 [<ffffffff8149c75d>] genl_register_mc_group+0x10d/0x2a0
 [<ffffffff81ad9da4>] genl_init+0x6c/0x84
 [<ffffffff810001de>] do_one_initcall+0x3e/0x170
 [<ffffffff81aae6ea>] kernel_init+0x197/0x21b
 [<ffffffff81003254>] kernel_thread_helper+0x4/0x10
 [<ffffffffffffffff>] 0xffffffffffffffff
pnp: PnP ACPI init
ACPI: bus type pnp registered
pnp 00:00: [bus 00-ff]
pnp 00:00: [io  0x0cf8-0x0cff]

This is specific to 2.6.38-rc1.