Running 3.12-rc3 just hit BUG in autofs4_expire_wait
[787422.065405] BUG: unable to handle kernel NULL pointer dereference at
0000000000000010
[787422.065567] IP: [<ffffffff812722d8>] autofs4_expire_wait+0x38/0x120
[787422.065659] PGD 163bdb067 PUD 163bbc067 PMD 0
[787422.065744] Oops: 0000 [#1] SMP
[787422.065825] Modules linked in: binfmt_misc nfsv3 rpcsec_gss_krb5
nfsv4 dns_resolver nfs fscache bridge stp llc ipt_MASQUERADE xt_nat
iptable_nat nf_nat_ipv4 nf_nat xt_physdev nf_conntrack_ipv4
nf_defrag_ipv4 xt_state nf_conntrack xt_multiport nfsd lockd nfs_acl
auth_rpcgss sunrpc ipmi_si ipmi_msghandler vhost_net iTCO_wdt macvtap
macvlan vhost iTCO_vendor_support pcspkr i7core_edac lpc_ich mfd_core
tun edac_core bnx2 hpwdt microcode acpi_power_meter oid_registry
kvm_intel kvm usb_storage hpsa ttm drm_kms_helper drm i2c_algo_bit i2c_core
[787422.066557] CPU: 10 PID: 20498 Comm: sed Not tainted 3.12.0-rc3+ #8
[787422.066640] Hardware name: HP ProLiant DL380 G6, BIOS P62 05/05/2011
[787422.066722] task: ffff88030e941790 ti: ffff880182a16000 task.ti:
ffff880182a16000
[787422.066872] RIP: 0010:[<ffffffff812722d8>] [<ffffffff812722d8>]
autofs4_expire_wait+0x38/0x120
[787422.067029] RSP: 0000:ffff880182a17aa8 EFLAGS: 00010246
[787422.067121] RAX: 00000000b1acb1ac RBX: ffff8802e1056a80 RCX:
0000000000000010
[787422.067270] RDX: 000000000000b1ac RSI: ffffffff81c3e3e0 RDI:
ffff88060e187d98
[787422.067457] RBP: ffff880182a17ad8 R08: 0000000000000000 R09:
ffffffff811a5748
[787422.067607] R10: ff030306ff030001 R11: ffffffffffffffff R12:
ffff88060e187d00
[787422.067758] R13: 0000000000000000 R14: 0000000000637461 R15:
ffff8802e1056a80
[787422.067909] FS: 0000000000000000(0000) GS:ffff880313ca0000(0000)
knlGS:0000000000000000
[787422.068061] CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b
[787422.068141] CR2: 0000000000000010 CR3: 000000010f106000 CR4:
00000000000027e0
[787422.068302] Stack:
[787422.068414] ffff880182a17af8 ffffffff810768fe 0000000000000100
ffff8802e1056a80
[787422.068575] ffff88060e187dc0 ffff88060e187dc0 ffff880182a17b48
ffffffff8126f5fc
[787422.068736] 0000000000000000 ffff880192afb890 ffff8802e1056ab8
0000000392afb890
[787422.068896] Call Trace:
[787422.068976] [<ffffffff810768fe>] ? prepare_to_wait+0x5e/0x90
[787422.069060] [<ffffffff8126f5fc>] do_expire_wait+0x17c/0x190
[787422.069142] [<ffffffff8126f9a4>] autofs4_d_manage+0xb4/0x170
[787422.069227] [<ffffffff8119af4d>] follow_managed+0xcd/0x2c0
[787422.069323] [<ffffffff8162a3f3>] lookup_slow+0x7b/0xaa
[787422.069441] [<ffffffff8119c4fa>] link_path_walk+0x34a/0x8d0
[787422.069524] [<ffffffff811a67d1>] ? dput+0x31/0x1f0
[787422.069606] [<ffffffff811aeac9>] ? mntput_no_expire+0x49/0x140
[787422.069690] [<ffffffff8119c0bc>] ? path_init+0x30c/0x400
[787422.069772] [<ffffffff8119cad8>] path_lookupat+0x58/0x740
[787422.069856] [<ffffffff8117a153>] ? kmem_cache_alloc+0x1c3/0x200
[787422.069939] [<ffffffff8117a12d>] ? kmem_cache_alloc+0x19d/0x200
[787422.071815] [<ffffffff8119d1f4>] filename_lookup+0x34/0xc0
[787422.071898] [<ffffffff811a0a59>] user_path_at_empty+0x59/0xa0
[787422.071981] [<ffffffff811a0b73>] ? do_filp_open+0x43/0xa0
[787422.072064] [<ffffffff811a0ab1>] user_path_at+0x11/0x20
[787422.072146] [<ffffffff81195761>] vfs_fstatat+0x51/0xb0
[787422.072228] [<ffffffff8119588b>] vfs_stat+0x1b/0x20
[787422.072311] [<ffffffff8104d6ca>] sys32_stat64+0x1a/0x40
[787422.072453] [<ffffffff8118f74a>] ? do_sys_open+0x1aa/0x220
[787422.072539] [<ffffffff8163cf49>] ia32_do_call+0x13/0x13
[787422.072619] Code: 48 89 5d e8 4c 89 65 f0 48 89 fb 4c 89 6d f8 48 8b
47 68 4c 8b 6f 78 4c 8b a0 00 03 00 00 49 8d bc 24 98 00 00 00 e8 78 0d
3c 00 <41> f6 45 10 01 74 61 66 41 83 84 24 98 00 00 00 01 f6 05 52 4a
[787422.073004] RIP [<ffffffff812722d8>] autofs4_expire_wait+0x38/0x120
[787422.073089] RSP <ffff880182a17aa8>
[787422.073164] CR2: 0000000000000010
[787422.073595] ---[ end trace c75e278f6383bf9a ]---
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