syzbot


WARNING in ext4_xattr_inode_update_ref

Status: upstream: reported C repro on 2025/09/10 09:46
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+48f1b5af9d99f72922d5@syzkaller.appspotmail.com
First crash: 125d, last: 21h47m
Bug presence (1)
Date Name Commit Repro Result
2025/11/18 upstream (ToT) e7c375b18160 C [report] WARNING in ext4_xattr_inode_update_ref
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in ext4_xattr_inode_update_ref origin:upstream -1 C 2802 8h22m 128d 0/3 upstream: reported C repro on 2025/09/07 01:50
upstream WARNING in ext4_xattr_inode_update_ref ext4 -1 C error 1291 75d 124d 29/29 fixed on 2025/10/29 21:02
linux-5.15 WARNING in ext4_xattr_inode_update_ref origin:upstream -1 C 1576 3h56m 125d 0/3 upstream: reported C repro on 2025/09/10 09:56
upstream WARNING in ext4_xattr_inode_update_ref (2) ext4 -1 C error 3594 3h30m 74d 0/29 upstream: reported C repro on 2025/10/30 22:34

Sample crash report:
syz.0.17[5925]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set
loop0: detected capacity change from 0 to 512
------------[ cut here ]------------
EA inode 11 i_nlink=2
WARNING: CPU: 1 PID: 5925 at fs/ext4/xattr.c:1058 ext4_xattr_inode_update_ref+0x4fb/0x550 fs/ext4/xattr.c:1056
Modules linked in:
CPU: 1 PID: 5925 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ext4_xattr_inode_update_ref+0x4fb/0x550 fs/ext4/xattr.c:1056
Code: 8d 7e 50 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 f6 20 9a ff 49 8b 37 48 c7 c7 60 c7 be 8a 89 da e8 c5 12 0d ff <0f> 0b 4c 8b 74 24 08 4c 8b 7c 24 10 e9 b9 fe ff ff e8 0f 0c 25 08
RSP: 0018:ffffc90002e571a0 EFLAGS: 00010246
RAX: 10680c56a4ffa300 RBX: 0000000000000002 RCX: ffff888029f80000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90002e57290 R08: ffff8880b8f28c13 R09: 1ffff110171e5182
R10: dffffc0000000000 R11: ffffed10171e5183 R12: dffffc0000000000
R13: ffff88805f4718a8 R14: ffff88805f4716b0 R15: ffff88805f471700
FS:  0000555562f61500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f45c5244000 CR3: 000000007c8b9000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1081 [inline]
 ext4_xattr_set_entry+0xcda/0x1e90 fs/ext4/xattr.c:1723
 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2267
 ext4_xattr_move_to_block fs/ext4/xattr.c:2670 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2738 [inline]
 ext4_expand_extra_isize_ea+0x13a3/0x1e90 fs/ext4/xattr.c:2826
 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5971
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6014 [inline]
 __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6092
 ext4_evict_inode+0x7ed/0xea0 fs/ext4/inode.c:252
 evict+0x486/0x870 fs/inode.c:705
 ext4_orphan_cleanup+0xbd4/0x1400 fs/ext4/orphan.c:472
 __ext4_fill_super fs/ext4/super.c:5617 [inline]
 ext4_fill_super+0x5e29/0x66f0 fs/ext4/super.c:5740
 get_tree_bdev+0x3e4/0x510 fs/super.c:1591
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5330790eea
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:00007ffdade0adf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdade0ae80 RCX: 00007f5330790eea
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007ffdade0ae40
RBP: 0000200000000180 R08: 00007ffdade0ae80 R09: 0000000000800700
R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007ffdade0ae40 R14: 000000000000046f R15: 000000000000002c
 </TASK>

Crashes (996):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/12 20:18 linux-6.6.y c596736dadab d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/11/15 22:59 linux-6.6.y 0a805b6ea8cd f7988ea4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/12 21:23 linux-6.6.y c596736dadab d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/12 16:08 linux-6.6.y c596736dadab d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/12 11:52 linux-6.6.y c596736dadab d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/12 10:24 linux-6.6.y c596736dadab d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/12 10:24 linux-6.6.y c596736dadab d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/11 13:27 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/11 00:15 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/10 10:27 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/10 03:51 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/10 03:41 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/10 00:52 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/09 17:29 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/09 14:27 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/09 08:15 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/08 19:37 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/08 05:40 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/08 05:39 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/06 21:19 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/06 04:51 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/06 01:04 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/05 11:39 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/05 08:12 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/04 20:28 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/04 18:56 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/04 18:43 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/04 08:04 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/04 06:16 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/03 23:46 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/03 10:21 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/02 23:07 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/02 23:00 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/02 07:11 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/01/01 12:41 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/31 23:11 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/31 09:02 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/31 08:00 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/30 19:37 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/30 06:50 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/30 00:26 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/29 10:49 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/28 21:58 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/28 04:31 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/28 02:27 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/28 02:27 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/12/27 12:48 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/09/10 22:48 linux-6.6.y fe9731e10004 fdeaa69b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2025/09/10 09:45 linux-6.6.y fe9731e10004 fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
* Struck through repros no longer work on HEAD.