Re: [syzbot ci] Re: ext4: test if inode's all dirty pages are submitted to disk

["yebin (H)" <yebin10@huawei.com>]

This is my oversight. If the file system has already become read-only
and dirty pages cannot be flushed back, no warning should be generated
at this time.

On 2026/2/27 15:52, syzbot ci wrote:
> syzbot ci has tested the following series
>
> [v1] ext4: test if inode's all dirty pages are submitted to disk
> https://lore.kernel.org/all/20260226110718.1904825-1-yebin@huaweicloud.com
> * [PATCH] ext4: test if inode's all dirty pages are submitted to disk
>
> and found the following issue:
> WARNING in ext4_evict_inode
>
> Full report is available here:
> https://ci.syzbot.org/series/8f9434e5-a73c-4b31-be9f-e9b76f1c2596
>
> ***
>
> WARNING in ext4_evict_inode
>
> tree:      torvalds
> URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
> base:      f4d0ec0aa20d49f09dc01d82894ce80d72de0560
> arch:      amd64
> compiler:  Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> config:    https://ci.syzbot.org/builds/7053c6f2-2ee6-4a1d-9f74-d2f56facd9f9/config
> C repro:   https://ci.syzbot.org/findings/4f7c2b91-8121-443d-9a4f-991feda8057c/c_repro
> syz repro: https://ci.syzbot.org/findings/4f7c2b91-8121-443d-9a4f-991feda8057c/syz_repro
>
> ------------[ cut here ]------------
> mapping_tagged(&inode->i_data, PAGECACHE_TAG_DIRTY)
> WARNING: fs/ext4/inode.c:191 at ext4_evict_inode+0xbdc/0xf10 fs/ext4/inode.c:191, CPU#1: syz-executor/5915
> Modules linked in:
> CPU: 1 UID: 0 PID: 5915 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:ext4_evict_inode+0xbdc/0xf10 fs/ext4/inode.c:191
> Code: ba 2c 02 00 48 8b bc 24 a0 00 00 00 e8 bd 49 14 00 e9 71 fe ff ff e8 43 63 40 ff 90 0f 0b 90 e9 e6 f4 ff ff e8 35 63 40 ff 90 <0f> 0b 90 e9 f2 f5 ff ff e8 27 63 40 ff 48 8d 3d 50 df 92 0d 67 48
> RSP: 0018:ffffc900048b79a0 EFLAGS: 00010293
> RAX: ffffffff8285287b RBX: ffff88811d980298 RCX: ffff8881027d8000
> RDX: 0000000000000000 RSI: 0000000004000000 RDI: 0000000000000000
> RBP: ffffc900048b7ab0 R08: ffffffff901181b7 R09: 1ffffffff2023036
> R10: dffffc0000000000 R11: fffffbfff2023037 R12: 1ffff92000916f44
> R13: dffffc0000000000 R14: ffff88811d9804b8 R15: 0000000004000000
> FS:  000055557d541500(0000) GS:ffff8882a9464000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000c00003e720 CR3: 000000010f9d2000 CR4: 00000000000006f0
> Call Trace:
>   <TASK>
>   evict+0x61e/0xb10 fs/inode.c:846
>   dispose_list fs/inode.c:888 [inline]
>   evict_inodes+0x75a/0x7f0 fs/inode.c:942
>   generic_shutdown_super+0xaa/0x2d0 fs/super.c:632
>   kill_block_super+0x44/0x90 fs/super.c:1725
>   ext4_kill_sb+0x68/0xb0 fs/ext4/super.c:7459
>   deactivate_locked_super+0xbc/0x130 fs/super.c:476
>   cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
>   task_work_run+0x1d9/0x270 kernel/task_work.c:233
>   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
>   __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
>   exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
>   __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
>   syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
>   syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
>   do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
>   entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fcf3c79d897
> Code: a2 c7 05 5c ee 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
> RSP: 002b:00007ffe2362cef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
> RAX: 0000000000000000 RBX: 00007fcf3c831ef0 RCX: 00007fcf3c79d897
> RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe2362cfb0
> RBP: 00007ffe2362cfb0 R08: 00007ffe2362dfb0 R09: 00000000ffffffff
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe2362e040
> R13: 00007fcf3c831ef0 R14: 000000000000f11c R15: 00007ffe2362e080
>   </TASK>
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
>    Tested-by: syzbot@syzkaller.appspotmail.com
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@googlegroups.com.
>
>
> .
>