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AJvYcCUUnC3EELfkVVyz2dZAr2CaeR+ZUIicwAnCt1+M6hrPZ0e2OemZkIZA8gVBQsbuy0pgBws79b6TGhZg@vger.kernel.org X-Gm-Message-State: AOJu0YzCzFn16DBwWkxZsSlb8po/mUQyzHDrPQhoQphGzQe3cW8hBgf/ sHh8lFZdJfWDLnAdtHJ3LEtOfKnzcmr5JQkP4bLJU03wqtaaKPhSyHLYGf6aryKOH8QRSlOzQyI QWO1DRED2mCVHawcMB+/gKRaSB2Cg3TfowUU9zjpSN8DCAD7t/lIpLLikU4Q= X-Google-Smtp-Source: AGHT+IH7K/LOkJUjlG3rKR7P/dRxolDR4iQGe2TKbFAebnEenAr/rpGcGAnpJoEc4BiGxFc8dUSs0azB+1dptAF2mz5PbyKwGhNN Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:6787:b0:450:d558:76f5 with SMTP id 5614622812f47-4511290cecemr19418847b6e.13.1764683223510; Tue, 02 Dec 2025 05:47:03 -0800 (PST) Date: Tue, 02 Dec 2025 05:47:03 -0800 In-Reply-To: <20251202132545.GA86223@macsyma.lan> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692eedd7.a70a0220.2ea503.00c5.GAE@google.com> Subject: Re: [syzbot] [ext4?] WARNING in __folio_mark_dirty (3) From: syzbot To: akpm@linux-foundation.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu, willy@infradead.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in __folio_mark_dirty ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6740 at mm/page-writeback.c:2716 __folio_mark_dirty+0x1fb/0xe20 mm/page-writeback.c:2716 Modules linked in: CPU: 1 UID: 0 PID: 6740 Comm: syz.0.31 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__folio_mark_dirty+0x1fb/0xe20 mm/page-writeback.c:2716 Code: 3c 38 00 74 08 48 89 df e8 d2 a1 26 00 4c 8b 33 4c 89 f6 48 83 e6 08 31 ff e8 71 ef c4 ff 49 83 e6 08 75 1c e8 06 ea c4 ff 90 <0f> 0b 90 eb 16 e8 fb e9 c4 ff e9 7e 07 00 00 e8 f1 e9 c4 ff eb 05 RSP: 0018:ffffc90003a979d0 EFLAGS: 00010293 RAX: ffffffff81f9d61a RBX: ffffea0001056b40 RCX: ffff888020775a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff9400020ad69 R12: ffff88805b014d00 R13: ffff88805b014cf8 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000555575052500(0000) GS:ffff888126ef6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000440 CR3: 0000000036d66000 CR4: 00000000003526f0 Call Trace: block_dirty_folio+0x17a/0x1d0 fs/buffer.c:754 fault_dirty_shared_page+0x103/0x570 mm/memory.c:3518 wp_page_shared mm/memory.c:3905 [inline] do_wp_page+0x263e/0x4930 mm/memory.c:4108 handle_pte_fault mm/memory.c:6193 [inline] __handle_mm_fault mm/memory.c:6318 [inline] handle_mm_fault+0x97c/0x3400 mm/memory.c:6487 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f1eba837398 Code: fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 66 0f 1f 84 00 00 00 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 c5 fe 6f 54 16 e0 c5 fe 6f 5c 16 c0 c5 RSP: 002b:00007ffd39d5fc68 EFLAGS: 00010246 RAX: 0000200000000440 RBX: 0000000000000004 RCX: 0030656c69662f2e RDX: 0000000000000008 RSI: 0030656c69662f2e RDI: 0000200000000440 RBP: 00007f1ebaac7da0 R08: 0000001b2cc20000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000009 R12: 00007f1ebaac5fac R13: 00007f1ebaac5fa0 R14: fffffffffffffffe R15: 00007ffd39d5fd80 Tested on: commit: 6fb67ac8 ext4: drop the TODO comment in ext4_es_insert.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev console output: https://syzkaller.appspot.com/x/log.txt?x=16156192580000 kernel config: https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833 dashboard link: https://syzkaller.appspot.com/bug?extid=b0a0670332b6b3230a0a compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Note: no patches were applied.