linux-kernel - Re: WARNING in __folio_mark

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Message-ID: <CAKFNMon7WkjF3wKD640nH1uXX=TWop2UfrS=Y0Mawf6rFYvY7Q@mail.gmail.com>
Date:   Wed, 10 Nov 2021 23:07:07 +0900
From:   Ryusuke Konishi <konishi.ryusuke@...il.com>
To:     Matthew Wilcox <willy@...radead.org>, Hao Sun <sunhao.th@...il.com>
Cc:     linux-nilfs <linux-nilfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: WARNING in __folio_mark_dirty

On Wed, Nov 10, 2021 at 10:57 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Wed, Nov 10, 2021 at 09:20:38AM +0800, Hao Sun wrote:
> > Hello,
> >
> > When using Healer to fuzz the latest Linux kernel, the following crash
> > was triggered.
>
> It's still a bug in nilfs, just like the last time this was reported.

Sorry, this looks like an existing issue of nilfs.  I will look into it.

Regards,
Ryusuke Konishi

> > HEAD commit: 6b75d88fa81b Merge branch 'i2c/for-current'
> > git tree: upstream
> > console output: https://paste.ubuntu.com/p/C22bhzvZP6/
> > kernel config: https://paste.ubuntu.com/p/b62Hp7BfJn/
> > C reproducer: https://paste.ubuntu.com/p/2mchRNDJr4/
> > Syzlang reproducer: https://paste.ubuntu.com/p/xM3DQ2f5Qz/
> >
> > If you fix this issue, please add the following tag to the commit:
> > Reported-by: Hao Sun <sunhao.th@...il.com>
> >
> > NILFS (loop10): segctord starting. Construction interval = 5 seconds,
> > CP frequency < 30 seconds
> > ------------[ cut here ]------------
> > WARNING: CPU: 3 PID: 18327 at include/linux/backing-dev.h:269
> > inode_to_wb include/linux/backing-dev.h:269 [inline]
> > WARNING: CPU: 3 PID: 18327 at include/linux/backing-dev.h:269
> > folio_account_dirtied mm/page-writeback.c:2460 [inline]
> > WARNING: CPU: 3 PID: 18327 at include/linux/backing-dev.h:269
> > __folio_mark_dirty+0xab2/0xe80 mm/page-writeback.c:2509
> > Modules linked in:
> > CPU: 3 PID: 18327 Comm: segctord Not tainted 5.15.0+ #6
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> > 1.13.0-1ubuntu1.1 04/01/2014
> > RIP: 0010:inode_to_wb include/linux/backing-dev.h:269 [inline]
> > RIP: 0010:folio_account_dirtied mm/page-writeback.c:2460 [inline]
> > RIP: 0010:__folio_mark_dirty+0xab2/0xe80 mm/page-writeback.c:2509
> > Code: ff ff ff 48 8d 78 70 e8 8c 69 96 07 31 ff 89 c6 89 44 24 10 e8
> > ff 52 d8 ff 8b 44 24 10 85 c0 0f 85 13 fa ff ff e8 8e 51 d8 ff <0f> 0b
> > e9 07 fa ff ff e8 82 51 d8 ff e8 9d 6a 96 07 31 ff 41 89 c7
> > RSP: 0018:ffffc900076ef7c0 EFLAGS: 00010046
> > RAX: 0000000000000000 RBX: ffff88802c478378 RCX: ffff88802fc33980
> > RDX: 0000000000000000 RSI: ffff88802fc33980 RDI: 0000000000000002
> > RBP: ffffea0000b7ca80 R08: ffffffff819f0012 R09: 0000000000000000
> > R10: 0000000000000005 R11: fffff9400016f950 R12: 0000000000000246
> > R13: ffff88802c478138 R14: 0000000000000001 R15: 0000000000000001
> > FS: 0000000000000000(0000) GS:ffff888135d00000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 000056054d573c18 CR3: 0000000021c4e000 CR4: 0000000000350ee0
> > Call Trace:
> > <TASK>
> > __set_page_dirty include/linux/pagemap.h:784 [inline]
> > mark_buffer_dirty+0x501/0x6a0 fs/buffer.c:1108
> > nilfs_btree_propagate_p fs/nilfs2/btree.c:1889 [inline]
> > nilfs_btree_propagate+0x4ba/0xce0 fs/nilfs2/btree.c:2085
> > nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337
> > nilfs_collect_dat_data+0x45/0xd0 fs/nilfs2/segment.c:625
> > nilfs_segctor_apply_buffers+0x149/0x480 fs/nilfs2/segment.c:1009
> > nilfs_segctor_scan_file+0x3d9/0x570 fs/nilfs2/segment.c:1058
> > nilfs_segctor_collect_blocks+0xa33/0x2fb0 fs/nilfs2/segment.c:1224
> > nilfs_segctor_collect fs/nilfs2/segment.c:1494 [inline]
> > nilfs_segctor_do_construct+0x1228/0x5ef0 fs/nilfs2/segment.c:2036
> > nilfs_segctor_construct+0x79f/0xb10 fs/nilfs2/segment.c:2372
> > nilfs_segctor_thread_construct fs/nilfs2/segment.c:2480 [inline]
> > nilfs_segctor_thread+0x3be/0xe40 fs/nilfs2/segment.c:2563
> > kthread+0x405/0x4f0 kernel/kthread.c:327
> > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
> > </TASK>
> >