linux-kernel - Regression in v5.0-rc1: Panic at boot

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Date:   Mon, 7 Jan 2019 12:41:06 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>
Cc:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Regression in v5.0-rc1: Panic at boot

Hey,

I found a regression in v5.0-rc1 this morning. My system panics on boot.
I've attached a log of the panic.

I bisected to find the problematic commit is:

Fixes: 9d037ad707ed ("block: remove req->timeout_list")

But it makes no sense to me why this commit would cause a problem like
this. I've attached a bisect log. I've also tested v5.0-rc1 with this
commit reverted and that boots fine.

The traceback seems to indicate the problem is on the bip_get_seed()
line in t10_pi_complete(). Which suggests that bio_integrity() is
returning NULL.

Thanks,

Logan

View attachment "bisect.log" of type "text/x-log" (2748 bytes)

View attachment "panic.log" of type "text/x-log" (7414 bytes)