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Subjectlinux-next - crashes in rhashtable_shrink
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For the past few kernels, I've seen occasional crashes in rhashtable_shrink.
Looks like the last thing to touch that code was the patch series:

Subject [PATCH 0/9 net-next v2] rhashtable: Per bucket locks & deferred table resizing
Date Fri, 2 Jan 2015 23:00:13 +0100

Most common appears to be during boot, while ip6tables-restore is
running (though I admit I am not sure if ip6tables-restore was actually
running, or if it ended up hung because somebody else had died while holding
a lock.). But I have also seen it after 10-12 hours of uptime

[ 53.762550] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 53.763607] IP: [<ffffffffab2a2898>] bucket_tail+0x57/0xaf

[ 53.771622] Workqueue: events rht_deferred_worker
[ 53.772715] task: ffff880224d20890 ti: ffff880224d24000 task.ti: ffff880224d24000

[ 53.793546] Call Trace:
[ 53.795374] [<ffffffffab2a38fd>] rhashtable_shrink+0x13e/0x1a0
[ 53.797197] [<ffffffffab2a3a02>] rht_deferred_worker+0xa3/0xb4
[ 53.798857] [<ffffffffab058ef6>] process_one_work+0x2d8/0x54d
[ 53.800070] [<ffffffffab0594d8>] worker_thread+0x343/0x46b
[ 53.801290] [<ffffffffab059195>] ? process_scheduled_works+0x2a/0x2a
[ 53.802513] [<ffffffffab05e19d>] kthread+0xea/0xf2
[ 53.803733] [<ffffffffab6c50ba>] ? _raw_spin_unlock_irq+0x29/0x74
[ 53.804957] [<ffffffffab05e0b3>] ? __kthread_parkme+0xa8/0xa8
[ 53.806176] [<ffffffffab6c5a6c>] ret_from_fork+0x7c/0xb0
[ 53.807400] [<ffffffffab05e0b3>] ? __kthread_parkme+0xa8/0xa8
[ 53.808609] Code: 4c 89 e7 e8 a1 ff ff ff 85 c0 75 1f 48 c7 c2 a9 89 b0 ab be 76 00 00 00 48 c7 c7 0d 61 b2 ab c6 05 a9 3d a3 00 01 e8 62 d6 dd ff <f6> 03 01 75 48 e8 d6 d7 de ff 85 c0 74 37 80 3d 90 3d a3 00 00
[ 53.810092] RIP [<ffffffffab2a2898>] bucket_tail+0x57/0xaf
[ 53.811414] RSP <ffff880224d27cc8>
[ 53.812721] CR2: 0000000000000000
[ 53.814033] ---[ end trace 82b77fc1a90284ff ]---

Unfortunately, I can't easily bisect to verify or narrow down further, as I'm only
seeing it 2-3 times a week....

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