WARNING: locking bug in ext4_xattr_inode_iget (2)

Status: upstream: reported C repro on 2024/03/31 14:03
Subsystems: ext4
[Documentation on labels]
First crash: 20d, last: 20d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ext4?] WARNING: locking bug in ext4_xattr_inode_iget (2) 0 (1) 2024/03/31 14:03
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING: locking bug in ext4_xattr_inode_iget origin:upstream missing-backport C inconclusive 7 111d 346d 0/3 upstream: reported C repro on 2023/05/06 10:34
upstream WARNING: locking bug in ext4_xattr_inode_iget ext4 C error 23 312d 343d 22/26 fixed on 2023/07/01 16:05
linux-5.15 WARNING: locking bug in ext4_xattr_inode_iget C error 4 315d 344d 0/3 auto-obsoleted due to no activity on 2023/09/14 16:49
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/04/14 09:20 26m retest repro git:// for-kernelci OK log

Sample crash report:
------------[ cut here ]------------
Looking for class "&ea_inode->i_rwsem" with key ext4_fs_type, but found a different class "&sb->s_type->i_mutex_key" with the same key
WARNING: CPU: 0 PID: 9266 at kernel/locking/lockdep.c:935 look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932
Modules linked in:
CPU: 0 PID: 9266 Comm: syz-executor362 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932
lr : look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932
sp : ffff80009cd170e0
x29: ffff80009cd170e0 x28: dfff800000000000 x27: ffff7000139a2ea0
x26: ffff80009341f300 x25: ffff80009341f000 x24: 0000000000000000
x23: ffff7000139a2e58 x22: 0000000000000000 x21: ffff80008f027b98
x20: ffff0000de282200 x19: ffff800092024890 x18: 1ffff000139a2e5c
x17: 0000000000000000 x16: ffff80008ad6b09c x15: 0000000000000001
x14: 1fffe00036800002 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000002 x10: 0000000000ff0100 x9 : a911bda9a52fff00
x8 : a911bda9a52fff00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80009cd169d8 x4 : ffff80008ed822c0 x3 : ffff8000805ba130
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932
 register_lock_class+0x8c/0x6ac kernel/locking/lockdep.c:1284
 __lock_acquire+0x184/0x763c kernel/locking/lockdep.c:5014
 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754
 down_write+0x50/0xc0 kernel/locking/rwsem.c:1579
 inode_lock include/linux/fs.h:804 [inline]
 ext4_xattr_inode_iget+0x344/0x4dc fs/ext4/xattr.c:461
 ext4_xattr_inode_get+0x12c/0x37c fs/ext4/xattr.c:535
 ext4_xattr_block_get fs/ext4/xattr.c:613 [inline]
 ext4_xattr_get+0x5d0/0x6f4 fs/ext4/xattr.c:714
 ext4_xattr_trusted_get+0x40/0x54 fs/ext4/xattr_trusted.c:27
 __vfs_getxattr+0x394/0x3c0 fs/xattr.c:424
 vfs_getxattr+0x268/0x2c4 fs/xattr.c:457
 do_getxattr+0x1e4/0x480 fs/xattr.c:739
 getxattr fs/xattr.c:772 [inline]
 path_getxattr+0x29c/0x388 fs/xattr.c:788
 __do_sys_lgetxattr fs/xattr.c:806 [inline]
 __se_sys_lgetxattr fs/xattr.c:803 [inline]
 __arm64_sys_lgetxattr+0xa0/0xb8 fs/xattr.c:803
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
irq event stamp: 57
hardirqs last  enabled at (57): [<ffff8000809fe3d0>] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234
hardirqs last disabled at (56): [<ffff8000809fe268>] kasan_quarantine_put+0x38/0x1c8 mm/kasan/quarantine.c:207
softirqs last  enabled at (8): [<ffff80008003165c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (6): [<ffff800080031628>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---


Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/27 14:00 git:// for-kernelci 707081b61156 454571b6 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING: locking bug in ext4_xattr_inode_iget
* Struck through repros no longer work on HEAD.