linux-kernel - Re: Potential Linux Crash: WARNING in ext4_dirty

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Message-Id: <20250326105914.3803197-1-matt@readmodwrite.com>
Date: Wed, 26 Mar 2025 10:59:14 +0000
From: Matt Fleming <matt@...dmodwrite.com>
To: willy@...radead.org
Cc: adilger.kernel@...ger.ca,
	akpm@...ux-foundation.org,
	linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	luka.2016.cs@...il.com,
	tytso@....edu,
	Barry Song <baohua@...nel.org>,
	kernel-team@...udflare.com,
	Vlastimil Babka <vbabka@...e.cz>,
	Miklos Szeredi <miklos@...redi.hu>,
	Amir Goldstein <amir73il@...il.com>
Subject: Re: Potential Linux Crash: WARNING in ext4_dirty_folio in Linux kernel v6.13-rc5

On Thu, Mar 06, 2025 at 05:13:51 +0000, Matthew wrote:
> This is the exact same problem I just analysed for you.  Except this
> time it's ext4 rather than FAT.
>
> https://lore.kernel.org/linux-mm/Z8kuWyqj8cS-stKA@casper.infradead.org/
> for the benefit of the ext4 people who're just finding out about this.

Hi there,

I'm also seeing this PF_MEMALLOC WARN triggered from kswapd in 6.12.19.

Does overlayfs need some kind of background inode reclaim support?

  Call Trace:
   <TASK>
   __alloc_pages_noprof+0x31c/0x330
   alloc_pages_mpol_noprof+0xe3/0x1d0
   folio_alloc_noprof+0x5b/0xa0
   __filemap_get_folio+0x1f3/0x380
   __getblk_slow+0xa3/0x1e0
   __ext4_get_inode_loc+0x121/0x4b0
   ext4_get_inode_loc+0x40/0xa0
   ext4_reserve_inode_write+0x39/0xc0
   __ext4_mark_inode_dirty+0x5b/0x220
   ext4_evict_inode+0x26d/0x690
   evict+0x112/0x2a0
   __dentry_kill+0x71/0x180
   dput+0xeb/0x1b0
   ovl_stack_put+0x2e/0x50 [overlay]
   ovl_destroy_inode+0x3a/0x60 [overlay]
   destroy_inode+0x3b/0x70
   __dentry_kill+0x71/0x180
   shrink_dentry_list+0x6b/0xe0
   prune_dcache_sb+0x56/0x80
   super_cache_scan+0x12c/0x1e0
   do_shrink_slab+0x13b/0x350
   shrink_slab+0x278/0x3a0
   shrink_node+0x328/0x880
   balance_pgdat+0x36d/0x740
   kswapd+0x1f0/0x380
   kthread+0xd2/0x100
   ret_from_fork+0x34/0x50
   ret_from_fork_asm+0x1a/0x30
   </TASK>

Thanks,
Matt