Message-ID: <68d26066.050a0220.139b6.0025.GAE@google.com>
Date: Tue, 23 Sep 2025 01:55:02 -0700
From: syzbot <syzbot+4c9d23743a2409b80293@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] WARNING in ext4_xattr_block_set (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in ext4_xattr_inode_update_ref

loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): orphan cleanup on readonly fs
EXT4-fs warning (device loop0): ext4_expand_extra_isize_ea:2851: Unable to expand inode 15. Delete some EAs or run e2fsck.
------------[ cut here ]------------
EA inode 11 i_nlink=2
WARNING: CPU: 1 PID: 6503 at fs/ext4/xattr.c:1053 ext4_xattr_inode_update_ref+0x534/0x5d0 fs/ext4/xattr.c:1051
Modules linked in:
CPU: 1 UID: 0 PID: 6503 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:ext4_xattr_inode_update_ref+0x534/0x5d0 fs/ext4/xattr.c:1051
Code: 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 84 c0 0f 85 86 00 00 00 41 8b 14 24 48 c7 c7 e0 70 1f 8b 4c 89 fe e8 ed 87 07 ff 90 <0f> 0b 90 90 48 bb 00 00 00 00 00 fc ff df e9 bb fd ff ff e8 74 59
RSP: 0018:ffffc900042af2e0 EFLAGS: 00010246
RAX: ce552e21466e5d00 RBX: dffffc0000000000 RCX: ffff88802f2e8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900042af3d0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1017124863 R12: ffff888057ec8f58
R13: 1ffff1100afd91eb R14: 00000000ffffffff R15: 000000000000000b
FS:  00007f61d52b66c0(0000) GS:ffff8881269bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c2b6a1000 CR3: 0000000025d4e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1076 [inline]
 ext4_xattr_inode_dec_ref_all+0x867/0xda0 fs/ext4/xattr.c:1218
 ext4_xattr_delete_inode+0xa4c/0xc10 fs/ext4/xattr.c:2945
 ext4_evict_inode+0xac9/0xee0 fs/ext4/inode.c:271
 evict+0x501/0x9c0 fs/inode.c:810
 ext4_orphan_cleanup+0xc20/0x1460 fs/ext4/orphan.c:474
 __ext4_fill_super fs/ext4/super.c:5609 [inline]
 ext4_fill_super+0x57fa/0x60b0 fs/ext4/super.c:5728
 get_tree_bdev_flags+0x40b/0x4d0 fs/super.c:1692
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f61d5c5066a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f61d52b5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f61d52b5ef0 RCX: 00007f61d5c5066a
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f61d52b5eb0
RBP: 0000200000000180 R08: 00007f61d52b5ef0 R09: 000000000080078b
R10: 000000000080078b R11: 0000000000000246 R12: 00002000000001c0
R13: 00007f61d52b5eb0 R14: 0000000000000473 R15: 0000200000000680
 </TASK>


Tested on:

commit:         cec1e6e5 Merge tag 'sched_ext-for-6.17-rc7-fixes' of g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16fd04e2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f5b21423ca3f0a96
dashboard link: https://syzkaller.appspot.com/bug?extid=4c9d23743a2409b80293
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=132d04e2580000

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