linux-ext4 - Re: simplify procfs code for seq

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Message-ID: <15622.1525102698@warthog.procyon.org.uk>
Date:   Mon, 30 Apr 2018 16:38:18 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     dhowells@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-rtc@...r.kernel.org, Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        jfs-discussion@...ts.sourceforge.net,
        linux-afs@...ts.infradead.org, linux-acpi@...r.kernel.org,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.com>, linux-ext4@...r.kernel.org,
        Alexey Dobriyan <adobriyan@...il.com>,
        megaraidlinux.pdl@...adcom.com, drbd-dev@...ts.linbit.com
Subject: Re: simplify procfs code for seq_file instances V2

Note that your kernel hits the:

	inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
	swapper/0/0 [HC1[1]:SC0[0]:HE0:SE1] takes:
		(ptrval) (fs_reclaim){?.+.}, at: fs_reclaim_acquire+0x12/0x35
	{HARDIRQ-ON-W} state was registered at:
	  fs_reclaim_acquire+0x32/0x35
	  kmem_cache_alloc_node_trace+0x49/0x2cf
	  alloc_worker+0x1d/0x49
	  init_rescuer.part.7+0x19/0x8f
	  workqueue_init+0xc0/0x1fe
	  kernel_init_freeable+0xdc/0x433
	  kernel_init+0xa/0xf5
	  ret_from_fork+0x24/0x30

bug, as described here:

	https://groups.google.com/forum/#!msg/syzkaller-bugs/sJC3Y3hOM08/aO3z9JXoAgAJ

David