Re: [moderation/CI] Re: ext4: move inline data cleanup to ext4_writepages to fix deadlock

#syz upstream

On Wed, Jun 10, 2026 at 9:33 AM syzbot ci
<[email protected]> wrote:
>
> syzbot ci has tested the following series
>
> [v1] ext4: move inline data cleanup to ext4_writepages to fix deadlock
> https://lore.kernel.org/all/[email protected]
> * [PATCH] ext4: move inline data cleanup to ext4_writepages to fix deadlock
>
> and found the following issue:
> kernel BUG in ext4_writepages
>
> Full report is available here:
> https://ci.syzbot.org/series/1ede6029-df2a-4e08-bffc-05540c1f4934
>
> ***
>
> kernel BUG in ext4_writepages
>
> tree:      torvalds
> URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
> base:      2d3090a8aeb596a26935db0955d46c9a5db5c6ce
> 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/63ee0324-2d17-4b32-aca2-c6230ff64be6/config
> syz repro: https://ci.syzbot.org/findings/676a447c-ea73-43ea-9949-054dac1961e5/syz_repro
>
> EXT4-fs warning (device loop2): ext4_expand_extra_isize_ea:2860: Unable to expand inode 15. Delete some EAs or run e2fsck.
> ------------[ cut here ]------------
> kernel BUG at fs/ext4/inode.c:3047!
> Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
> CPU: 1 UID: 0 PID: 5875 Comm: syz.2.19 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_writepages+0x622/0x630 fs/ext4/inode.c:3046
> Code: ff e9 61 fc ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c de fc ff ff 4c 89 f7 e8 f9 2f a8 ff e9 d1 fc ff ff e8 ef d7 3c ff 90 <0f> 0b 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90
> RSP: 0018:ffffc900034df2e0 EFLAGS: 00010293
> RAX: ffffffff8288dfb1 RBX: 1ffff9200069be60 RCX: ffff888110555940
> RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
> RBP: ffffc900034df410 R08: ffff8881b48c2f0f R09: 1ffff110369185e1
> R10: dffffc0000000000 R11: ffffed10369185e2 R12: dffffc0000000000
> R13: 0000004000000000 R14: 0000004610000000 R15: 1ffff11020c6fcc5
> FS:  00007f033e9346c0(0000) GS:ffff8882a92a0000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00005556842f3058 CR3: 000000016d5c0000 CR4: 00000000000006f0
> Call Trace:
>  <TASK>
>  do_writepages+0x32e/0x550 mm/page-writeback.c:2571
>  __writeback_single_inode+0x133/0x10e0 fs/fs-writeback.c:1764
>  writeback_single_inode+0x4ac/0xdc0 fs/fs-writeback.c:1883
>  write_inode_now+0x1c2/0x290 fs/fs-writeback.c:2974
>  iput_final fs/inode.c:1950 [inline]
>  iput+0x8c1/0xe80 fs/inode.c:2009
>  ext4_orphan_cleanup+0xc38/0x1470 fs/ext4/orphan.c:472
>  __ext4_fill_super fs/ext4/super.c:5701 [inline]
>  ext4_fill_super+0x5a19/0x6330 fs/ext4/super.c:5824
>  get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
>  vfs_get_tree+0x92/0x2a0 fs/super.c:1754
>  fc_mount fs/namespace.c:1193 [inline]
>  do_new_mount_fc fs/namespace.c:3758 [inline]
>  do_new_mount+0x341/0xd30 fs/namespace.c:3834
>  do_mount fs/namespace.c:4167 [inline]
>  __do_sys_mount fs/namespace.c:4383 [inline]
>  __se_sys_mount+0x31d/0x420 fs/namespace.c:4360
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f033d99e0ca
> Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f033e933e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
> RAX: ffffffffffffffda RBX: 00007f033e933ee0 RCX: 00007f033d99e0ca
> RDX: 0000200000000040 RSI: 00002000000016c0 RDI: 00007f033e933ea0
> RBP: 0000200000000040 R08: 00007f033e933ee0 R09: 000000000000840e
> R10: 000000000000840e R11: 0000000000000246 R12: 00002000000016c0
> R13: 00007f033e933ea0 R14: 000000000000042f R15: 0000200000000080
>  </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:ext4_writepages+0x622/0x630 fs/ext4/inode.c:3046
> Code: ff e9 61 fc ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c de fc ff ff 4c 89 f7 e8 f9 2f a8 ff e9 d1 fc ff ff e8 ef d7 3c ff 90 <0f> 0b 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90
> RSP: 0018:ffffc900034df2e0 EFLAGS: 00010293
> RAX: ffffffff8288dfb1 RBX: 1ffff9200069be60 RCX: ffff888110555940
> RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
> RBP: ffffc900034df410 R08: ffff8881b48c2f0f R09: 1ffff110369185e1
> R10: dffffc0000000000 R11: ffffed10369185e2 R12: dffffc0000000000
> R13: 0000004000000000 R14: 0000004610000000 R15: 1ffff11020c6fcc5
> FS:  00007f033e9346c0(0000) GS:ffff8882a92a0000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00005556842f3058 CR3: 000000016d5c0000 CR4: 00000000000006f0
>
>
> ***
>
> 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: [email protected]
>
> ---
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