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Message-ID: <68caac3d.050a0220.2ff435.055e.GAE@google.com>
Date: Wed, 17 Sep 2025 05:40:29 -0700
From: syzbot <syzbot+3028e4abe404f87a385f@...kaller.appspotmail.com>
To: adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: [syzbot] [ext4?] INFO: trying to register non-static key in ext4_xattr_get
Hello,
syzbot found the following issue on:
HEAD commit: 22f20375f5b7 Merge tag 'pci-v6.17-fixes-3' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10fd5934580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f5b21423ca3f0a96
dashboard link: https://syzkaller.appspot.com/bug?extid=3028e4abe404f87a385f
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c68f77b43077/disk-22f20375.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8ef15b7a075a/vmlinux-22f20375.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c341517a203/bzImage-22f20375.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3028e4abe404f87a385f@...kaller.appspotmail.com
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 13193 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
assign_lock_key+0x133/0x150 kernel/locking/lockdep.c:984
register_lock_class+0x105/0x320 kernel/locking/lockdep.c:1299
__lock_acquire+0x99/0xd20 kernel/locking/lockdep.c:5112
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
__rwbase_read_lock+0xa1/0x180 kernel/locking/rwbase_rt.c:76
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1466 [inline]
down_read+0x127/0x1f0 kernel/locking/rwsem.c:1539
ext4_xattr_get+0x10a/0x6a0 fs/ext4/xattr.c:704
__vfs_getxattr+0x3f1/0x430 fs/xattr.c:423
smk_fetch+0xb4/0x140 security/smack/smack_lsm.c:289
smack_d_instantiate+0x6f5/0x940 security/smack/smack_lsm.c:3606
security_d_instantiate+0x10a/0x200 security/security.c:4109
d_splice_alias_ops+0x71/0x370 fs/dcache.c:2998
ext4_lookup+0x2b9/0x6c0 fs/ext4/namei.c:1814
__lookup_slow+0x29d/0x3d0 fs/namei.c:1808
lookup_slow+0x53/0x70 fs/namei.c:1825
walk_component+0x2d2/0x400 fs/namei.c:2129
lookup_last fs/namei.c:2630 [inline]
path_lookupat+0x163/0x430 fs/namei.c:2654
filename_lookup+0x212/0x570 fs/namei.c:2683
user_path_at+0x3a/0x60 fs/namei.c:3127
ksys_umount fs/namespace.c:2112 [inline]
__do_sys_umount fs/namespace.c:2120 [inline]
__se_sys_umount fs/namespace.c:2118 [inline]
__x64_sys_umount+0xee/0x160 fs/namespace.c:2118
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: 0033:0x7fa56aa0fed7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcf1d8f548 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa56aa0fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcf1d8f600
RBP: 00007ffcf1d8f600 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffcf1d906f0
R13: 00007fa56aa91c05 R14: 000055558570a4a8 R15: 00007ffcf1d917c0
</TASK>
Oops: general protection fault, probably for non-canonical address 0xfbd5a5d5a000000b: 0000 [#1] SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0xdead4ead00000058-0xdead4ead0000005f]
CPU: 1 UID: 0 PID: 13193 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rt_mutex_top_waiter kernel/locking/rtmutex_common.h:138 [inline]
RIP: 0010:task_blocks_on_rt_mutex kernel/locking/rtmutex.c:1240 [inline]
RIP: 0010:__rt_mutex_slowlock kernel/locking/rtmutex.c:1719 [inline]
RIP: 0010:__rt_mutex_slowlock_locked+0xb61/0x25e0 kernel/locking/rtmutex.c:1760
Code: ff ff ff ff e8 70 30 5b 09 85 c0 0f 84 45 04 00 00 48 85 db 0f 84 49 04 00 00 48 89 5c 24 48 48 83 c3 58 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 10 f6 81 00 48 8b 44 24 10 48 39
RSP: 0018:ffffc9000413f2a0 EFLAGS: 00010802
RAX: 1bd5a9d5a000000b RBX: dead4ead00000058 RCX: 0000000000000078
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802f9559ac
RBP: ffffc9000413f490 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000827e44 R12: ffff88802f957060
R13: ffff88802f955958 R14: 00000000fffffffe R15: dffffc0000000000
FS: 000055558570a500(0000) GS:ffff8881269bd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcf1d8dca8 CR3: 00000000537e4000 CR4: 00000000003526f0
Call Trace:
<TASK>
__rwbase_read_lock+0xbc/0x180 kernel/locking/rwbase_rt.c:114
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1466 [inline]
down_read+0x127/0x1f0 kernel/locking/rwsem.c:1539
ext4_xattr_get+0x10a/0x6a0 fs/ext4/xattr.c:704
__vfs_getxattr+0x3f1/0x430 fs/xattr.c:423
smk_fetch+0xb4/0x140 security/smack/smack_lsm.c:289
smack_d_instantiate+0x6f5/0x940 security/smack/smack_lsm.c:3606
security_d_instantiate+0x10a/0x200 security/security.c:4109
d_splice_alias_ops+0x71/0x370 fs/dcache.c:2998
ext4_lookup+0x2b9/0x6c0 fs/ext4/namei.c:1814
__lookup_slow+0x29d/0x3d0 fs/namei.c:1808
lookup_slow+0x53/0x70 fs/namei.c:1825
walk_component+0x2d2/0x400 fs/namei.c:2129
lookup_last fs/namei.c:2630 [inline]
path_lookupat+0x163/0x430 fs/namei.c:2654
filename_lookup+0x212/0x570 fs/namei.c:2683
user_path_at+0x3a/0x60 fs/namei.c:3127
ksys_umount fs/namespace.c:2112 [inline]
__do_sys_umount fs/namespace.c:2120 [inline]
__se_sys_umount fs/namespace.c:2118 [inline]
__x64_sys_umount+0xee/0x160 fs/namespace.c:2118
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: 0033:0x7fa56aa0fed7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcf1d8f548 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa56aa0fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcf1d8f600
RBP: 00007ffcf1d8f600 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffcf1d906f0
R13: 00007fa56aa91c05 R14: 000055558570a4a8 R15: 00007ffcf1d917c0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rt_mutex_top_waiter kernel/locking/rtmutex_common.h:138 [inline]
RIP: 0010:task_blocks_on_rt_mutex kernel/locking/rtmutex.c:1240 [inline]
RIP: 0010:__rt_mutex_slowlock kernel/locking/rtmutex.c:1719 [inline]
RIP: 0010:__rt_mutex_slowlock_locked+0xb61/0x25e0 kernel/locking/rtmutex.c:1760
Code: ff ff ff ff e8 70 30 5b 09 85 c0 0f 84 45 04 00 00 48 85 db 0f 84 49 04 00 00 48 89 5c 24 48 48 83 c3 58 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 10 f6 81 00 48 8b 44 24 10 48 39
RSP: 0018:ffffc9000413f2a0 EFLAGS: 00010802
RAX: 1bd5a9d5a000000b RBX: dead4ead00000058 RCX: 0000000000000078
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802f9559ac
RBP: ffffc9000413f490 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000827e44 R12: ffff88802f957060
R13: ffff88802f955958 R14: 00000000fffffffe R15: dffffc0000000000
FS: 000055558570a500(0000) GS:ffff8881269bd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcf1d8dca8 CR3: 00000000537e4000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 4 bytes skipped:
0: e8 70 30 5b 09 call 0x95b3075
5: 85 c0 test %eax,%eax
7: 0f 84 45 04 00 00 je 0x452
d: 48 85 db test %rbx,%rbx
10: 0f 84 49 04 00 00 je 0x45f
16: 48 89 5c 24 48 mov %rbx,0x48(%rsp)
1b: 48 83 c3 58 add $0x58,%rbx
1f: 48 89 d8 mov %rbx,%rax
22: 48 c1 e8 03 shr $0x3,%rax
* 26: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction
2b: 74 08 je 0x35
2d: 48 89 df mov %rbx,%rdi
30: e8 10 f6 81 00 call 0x81f645
35: 48 8b 44 24 10 mov 0x10(%rsp),%rax
3a: 48 rex.W
3b: 39 .byte 0x39
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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