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([2a09:bac1:28e0:840::179:137]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3997f99540bsm16374900f8f.2.2025.03.26.03.59.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Mar 2025 03:59:16 -0700 (PDT) From: Matt Fleming To: willy@infradead.org Cc: adilger.kernel@dilger.ca, akpm@linux-foundation.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, luka.2016.cs@gmail.com, tytso@mit.edu, Barry Song , kernel-team@cloudflare.com, Vlastimil Babka , Miklos Szeredi , Amir Goldstein Subject: Re: Potential Linux Crash: WARNING in ext4_dirty_folio in Linux kernel v6.13-rc5 Date: Wed, 26 Mar 2025 10:59:14 +0000 Message-Id: <20250326105914.3803197-1-matt@readmodwrite.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: __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 Thanks, Matt