NULL pointer dereference when loading the gre module (3.10.0-rc4)

[Steinar H. Gunderson]

Hi,

In 3.10.0-rc4, I get this on boot:

[   16.871043] BUG: unable to handle kernel NULL pointer dereference at 0000000000000003
[   16.879453] IP: [<ffffffffa0e52002>] 0xffffffffa0e52001
[   16.884995] PGD 0 
[   16.887313] Oops: 0000 [#1] SMP 
[   16.890904] Modules linked in: ip_gre(+) gre ip_tunnel psmouse ide_generic ide_gd_mod ide_cd_mod cdrom acpi_cpufreq mperf coretemp kvm_intel kvm iTCO_wdt iTCO_vendor_support i2c_i801 microcode lpc_ich pcspkr i2c_core mfd_core ehci_pci evbug evdev ext4 crc16 jbd2 mbcache dm_mod raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 md_mod sg sd_mod usbhid ide_pci_generic ide_core crc32c_intel e1000e ata_piix ptp pps_core uhci_hcd ehci_hcd mpt2sas raid_class unix
[   16.939181] CPU: 0 PID: 3261 Comm: modprobe Not tainted 3.10.0-rc4 #1
[   16.945873] Hardware name: Supermicro X8DTL/X8DTL, BIOS 2.1a       12/30/2011
[   16.953252] task: ffff880621662d60 ti: ffff8806227de000 task.ti: ffff8806227de000
[   16.961184] RIP: 0010:[<ffffffffa0e52002>]  [<ffffffffa0e52002>] 0xffffffffa0e52001
[   16.969346] RSP: 0018:ffff8806227dfca8  EFLAGS: 00010246
[   16.974903] RAX: ffffffffa0e5d000 RBX: ffff880623ebe280 RCX: 0000000000000000
[   16.982285] RDX: ffffffffa0e5aa40 RSI: 0000000000000003 RDI: ffffffffa0e5d018
[   16.989674] RBP: ffff8806227dfca8 R08: 000000000000072f R09: ffffffff812bae96
[   16.997051] R10: ffffea00188d1200 R11: 0000000000000000 R12: ffff88061f874900
[   17.004440] R13: ffffffffa0e5a9c0 R14: ffff8806227dfef8 R15: 0000000000000002
[   17.011818] FS:  00007f7da1d97700(0000) GS:ffff880627200000(0000) knlGS:0000000000000000
[   17.020357] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   17.026349] CR2: 0000000000000003 CR3: 0000000621b84000 CR4: 00000000000007f0
[   17.033734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   17.041110] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   17.048494] Stack:
[   17.050757]  ffff8806227dfcf8 ffffffff812baf26 2222222222222222 2222222222222222
[   17.058857]  2222222222222222 ffffffffa0e5a9c0 0000000000000000 0000000000000000
[   17.066933]  ffff8806227dfef8 ffffffffa0e5ab60 ffff8806227dfd28 ffffffff812bafb6
[   17.075008] Call Trace:
[   17.077703]  [<ffffffff812baf26>] ops_init.constprop.7+0xc6/0xf5
[   17.083956]  [<ffffffff812bafb6>] register_pernet_operations.isra.4+0x61/0x91
[   17.091340]  [<ffffffff8138486f>] ? mutex_lock+0xf/0x20
[   17.096822]  [<ffffffff812bb006>] register_pernet_device+0x20/0x51
[   17.103254]  [<ffffffffa0e5d034>] ? ipgre_tap_init_net+0x1a/0x1a [ip_gre]
[   17.110298]  [<ffffffffa0e5d055>] ipgre_init+0x21/0xc9 [ip_gre]
[   17.116470]  [<ffffffffa0e5d034>] ? ipgre_tap_init_net+0x1a/0x1a [ip_gre]
[   17.123515]  [<ffffffff81000263>] do_one_initcall+0x7b/0x10c
[   17.129422]  [<ffffffff8107e5db>] load_module+0x1b1f/0x1e19
[   17.135241]  [<ffffffff8107a4f8>] ? sys_getegid16+0x44/0x44
[   17.141058]  [<ffffffff81386cf2>] ? page_fault+0x22/0x30
[   17.146618]  [<ffffffff8107e969>] SyS_init_module+0x94/0xa1
[   17.152440]  [<ffffffff8138cf12>] system_call_fastpath+0x16/0x1b
[   17.158695] Code: <6e> 65 77 6c 69 6e 6b 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
[   17.168440] RIP  [<ffffffffa0e52002>] 0xffffffffa0e52001
[   17.174058]  RSP <ffff8806227dfca8>
[   17.177798] CR2: 0000000000000003
[   17.181730] ---[ end trace 531fea804a54bcad ]---

I assume this is from loading ip_gre, given that it's somewhere in the call
stack; amazingly enough, GRE tunnels seem to actually still work, though,
although I cannot load other modules such as ip_tables (modprobe hangs).

/* Steinar */
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Homepage: http://www.sesse.net/
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