automount/kernel crashes

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We are seeing occasional (approx. weekly) automount/kernel crashes using
kernel version 3.1.7 and autofs version 5.0.5-39.  The log files show
the following traceback:


kernel: general protection fault: 0000 [#1] SMP 
kernel: CPU 1 
kernel: Modules linked in: binfmt_misc xt_tcpudp iptable_filter ip_tables ipt_ULOG x_tables nfsd dm_snapshot dm_mirror dm_region_hash dm_log sg bnx2 rng_core ipv6 ext4 jbd2 crc16 usbhid sd_mod sr_mod cdrom ata_piix libata megaraid_sas ehci_hcd uhci_hcd scsi_mod button radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core cfbcopyarea cfbimgblt cfbfillrect dm_mod [last unloaded: scsi_wait_scan]
kernel: Pid: 12716, comm: automount Not tainted 3.1.7-0cse.1 #6 Dell Inc. PowerEdge 2950/0CU542
kernel: RIP: 0010:[<ffffffff8139c5b9>]  [<ffffffff8139c5b9>] _raw_spin_lock+0x9/0x20
kernel: RSP: 0018:ffff880009ef9d48  EFLAGS: 00010283
kernel: RAX: 0000000000000100 RBX: ffff880424297240 RCX: dead0000001000cc
kernel: RDX: ffff8803d7bdd840 RSI: ffff880421eb3d00 RDI: dead0000001000cc
kernel: RBP: ffff880009ef9d48 R08: 0000000000000001 R09: 00007f516fbfad20
kernel: R10: 0000000000000000 R11: 0000000000000246 R12: dead000000100070
kernel: R13: ffff880414436480 R14: dead000000100100 R15: ffff8804242972a8
kernel: FS:  00007f516fbfb700(0000) GS:ffff88043fc40000(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 00007f516fbfad30 CR3: 000000016ba69000 CR4: 00000000000006e0
kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
kernel: Process automount (pid: 12716, threadinfo ffff880009ef8000, task ffff880071d14410)
kernel: Stack:
kernel: ffff880009ef9dd8 ffffffff811b72b3 ffff8802e407ca80 dead0000001000cc
kernel: ffff8803d7bdd840 ffff880009ef9f28 00000000000124f8 0000000000000000
kernel: ffff880421eb3d00 ffff8804144364dc ffff880414436520 ffff880424297240
kernel: Call Trace:
kernel: [<ffffffff811b72b3>] autofs4_expire_indirect+0xd3/0x440
kernel: [<ffffffff811b78a5>] autofs4_do_expire_multi+0xc5/0x110
kernel: [<ffffffff811b7c90>] ? autofs_dev_ioctl_askumount+0x30/0x30
kernel: [<ffffffff811b7caa>] autofs_dev_ioctl_expire+0x1a/0x20
kernel: [<ffffffff811b8253>] _autofs_dev_ioctl+0x273/0x360
kernel: [<ffffffff810ee9f6>] ? __d_free+0x46/0x70
kernel: [<ffffffff811b834e>] autofs_dev_ioctl+0xe/0x20
kernel: [<ffffffff810eb166>] do_vfs_ioctl+0x96/0x550
kernel: [<ffffffff810f6a7a>] ? mntput+0x1a/0x30
kernel: [<ffffffff810dbc4f>] ? fput+0x16f/0x210
kernel: [<ffffffff810eb66a>] sys_ioctl+0x4a/0x80
kernel: [<ffffffff813a277b>] system_call_fastpath+0x16/0x1b
kernel: Code: 00 75 05 f0 66 0f b1 17 0f 94 c2 0f b6 c2 85 c0 0f 95 c0 0f b6 c0 5d c3 66 2e 0f 1f 84 00 00 00 00 00 55 b8 00 01 00 00 48 89 e5 <f0> 66 0f c1 07 38 e0 74 06 f3 90 8a 07 eb f6 5d c3 66 0f 1f 44 
kernel: RIP  [<ffffffff8139c5b9>] _raw_spin_lock+0x9/0x20
kernel: RSP <ffff880009ef9d48>
kernel: ---[ end trace e45ee0e39b72b82b ]---


Note that the register dump contains numerous values like
	R14: dead000000100100

which seems to indicate some sort of list corruption/locking problem. The
actual fault instruction seems to be from a call to _raw_spin_lock contained
in the inline expansion of the fs/autofs4/expire.c[get_next_positive_subdir]
call in the while loop of expire.c[autofs4_expire_indirect].

Is this a known problem?  Anybody else seeing these faults?
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