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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: 177d, last: 15m
▶ ▼ 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 3275 3h06m 181d 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 128d 177d 29/29 fixed on 2025/10/29 21:02
linux-5.15 WARNING in ext4_xattr_inode_update_ref origin:upstream -1 C 1832 1h45m 177d 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 5127 47m 127d 0/29 upstream: reported C repro on 2025/10/30 22:34

Sample crash report:
set_capacity_and_notify: 15 callbacks suppressed
loop0: detected capacity change from 0 to 512
EXT4-fs error (device loop0): ext4_orphan_get:1424: comm syz.0.597: bad orphan inode 15
ext4_test_bit(bit=14, block=4) = 1
is_bad_inode(inode)=0
NEXT_ORPHAN(inode)=1772798265
max_ino=32
i_nlink=0
------------[ cut here ]------------
EA inode 11 i_nlink=0
WARNING: CPU: 0 PID: 7025 at fs/ext4/xattr.c:1059 ext4_xattr_inode_update_ref+0x53c/0x590 fs/ext4/xattr.c:1057
Modules linked in:
CPU: 0 PID: 7025 Comm: syz.0.597 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_xattr_inode_update_ref+0x53c/0x590 fs/ext4/xattr.c:1057
Code: 8d 7e 50 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 05 ec 98 ff 49 8b 37 48 c7 c7 60 d5 de 8a 89 da e8 44 77 0a ff <0f> 0b 4c 8b 74 24 08 4c 8b 7c 24 10 e9 ab fe ff ff e8 ce b3 3e 08
RSP: 0018:ffffc9000d777280 EFLAGS: 00010246
RAX: 903b5d7885a8ec00 RBX: 0000000000000000 RCX: ffff88802b8bda00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc9000d777370 R08: ffffc9000d776e87 R09: 1ffff92001aeedd0
R10: dffffc0000000000 R11: fffff52001aeedd1 R12: dffffc0000000000
R13: ffff888073f222a8 R14: ffff888073f220b0 R15: ffff888073f22100
FS:  0000555584d26500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f376097d000 CR3: 000000006056c000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1082 [inline]
 ext4_xattr_inode_dec_ref_all+0x9a6/0x1040 fs/ext4/xattr.c:1228
 ext4_xattr_delete_inode+0xb3e/0xd10 fs/ext4/xattr.c:2949
 ext4_evict_inode+0xaaf/0xea0 fs/ext4/inode.c:269
 evict+0x4ca/0x8d0 fs/inode.c:705
 ext4_orphan_get+0x4e7/0x600 fs/ext4/ialloc.c:1439
 ext4_orphan_cleanup+0xa9e/0x1420 fs/ext4/orphan.c:465
 __ext4_fill_super fs/ext4/super.c:5617 [inline]
 ext4_fill_super+0x5ed0/0x6790 fs/ext4/super.c:5740
 get_tree_bdev+0x3f3/0x520 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+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4f2719da0a
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:00007ffdbe6d2f28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdbe6d2fb0 RCX: 00007f4f2719da0a
RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007ffdbe6d2f70
RBP: 0000200000000180 R08: 00007ffdbe6d2fb0 R09: 0000000000800700
R10: 0000000000800700 R11: 0000000000000246 R12: 0000200000000000
R13: 00007ffdbe6d2f70 R14: 000000000000047a R15: 0000200000000300
 </TASK>

Crashes (1173):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/06 11:57 linux-6.6.y 4fc00fe35d46 31e9c887 .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
2026/03/04 03:44 linux-6.6.y 7a137e9bfa0e 4180d919 .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
2026/03/02 00:13 linux-6.6.y 7a137e9bfa0e 43249bac .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
2026/02/22 20:39 linux-6.6.y 7a137e9bfa0e 6e7b5511 .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
2026/02/15 03:26 linux-6.6.y 1b4ef5214f17 1e62d198 .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
2026/02/07 14:48 linux-6.6.y c56aaf1a85ae f20fc9f9 .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
2026/02/04 11:20 linux-6.6.y 2cf6f68313dc 42b01fab .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
2026/02/01 12:58 linux-6.6.y 2cf6f68313dc 6b8752f2 .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
2026/01/25 14:34 linux-6.6.y cbb31f77b879 40acda8a .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
2026/01/16 07:50 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
2026/01/14 11:39 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
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
2026/02/28 17:13 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/07 07:57 linux-6.6.y 4fc00fe35d46 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/04 22:16 linux-6.6.y 682d8e2f892b e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/04 06:55 linux-6.6.y 7a137e9bfa0e 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/03 17:30 linux-6.6.y 7a137e9bfa0e 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/02 06:28 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/01 23:51 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/01 14:18 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/01 13:37 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/03/01 10:06 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/28 20:55 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/28 11:22 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/27 08:49 linux-6.6.y 7a137e9bfa0e a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/26 08:21 linux-6.6.y 7a137e9bfa0e e0f78d93 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/25 18:39 linux-6.6.y 7a137e9bfa0e 94a9671e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/24 20:13 linux-6.6.y 7a137e9bfa0e 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/24 19:30 linux-6.6.y 7a137e9bfa0e 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/24 07:34 linux-6.6.y 7a137e9bfa0e 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/24 05:27 linux-6.6.y 7a137e9bfa0e 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/23 04:35 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/22 20:10 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/22 11:19 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/22 02:35 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/22 01:41 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/20 17:30 linux-6.6.y 7a137e9bfa0e 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/20 04:26 linux-6.6.y 7a137e9bfa0e c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/19 11:52 linux-6.6.y 56865d9b7074 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/17 13:45 linux-6.6.y 56865d9b7074 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/16 01:01 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/15 15:16 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/15 15:10 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/15 03:07 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/14 22:14 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/10 21:09 linux-6.6.y c56aaf1a85ae 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/09 06:06 linux-6.6.y c56aaf1a85ae 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/08 20:48 linux-6.6.y c56aaf1a85ae 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/05 17:39 linux-6.6.y 2cf6f68313dc 4936e85c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/05 17:36 linux-6.6.y 2cf6f68313dc 4936e85c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/05 06:59 linux-6.6.y 2cf6f68313dc ea10c935 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/05 01:59 linux-6.6.y 2cf6f68313dc ea10c935 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/04 21:26 linux-6.6.y 2cf6f68313dc ea10c935 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/02 18:20 linux-6.6.y 2cf6f68313dc 018ebef2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ext4_xattr_inode_update_ref
2026/02/01 08:03 linux-6.6.y 2cf6f68313dc 6b8752f2 .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.