[moderation] [fs?] WARNING in vfs_set_acl (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: db2ddb871435 Linux 7.2-rc7
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1684d079580000
kernel config: https://syzkaller.appspot.com/x/.config?x=dd70c0851d340092
dashboard link: https://syzkaller.appspot.com/bug?extid=f765fbdd39e66332718e
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
CC: [bra...@kernel.org ja...@suse.cz linux-...@vger.kernel.org linux-...@vger.kernel.org vi...@zeniv.linux.org.uk]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/026722464b44/disk-db2ddb87.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0ab0dcb97f3e/vmlinux-db2ddb87.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4889eea15f3a/bzImage-db2ddb87.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f765fb...@syzkaller.appspotmail.com

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DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88804cd1bb18, owner = 0x0, curr 0xffff8880333a3e00, list not empty
WARNING: kernel/locking/rwsem.c:1412 at __up_write kernel/locking/rwsem.c:1412 [inline], CPU#1: syz.7.1301/10983
WARNING: kernel/locking/rwsem.c:1412 at up_write+0x20f/0x5c0 kernel/locking/rwsem.c:1688, CPU#1: syz.7.1301/10983
Modules linked in:
CPU: 1 UID: 0 PID: 10983 Comm: syz.7.1301 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__up_write kernel/locking/rwsem.c:1412 [inline]
RIP: 0010:up_write+0x226/0x5c0 kernel/locking/rwsem.c:1688
Code: 3c 02 00 0f 85 3e 03 00 00 48 8b 13 48 8d 3d f1 2a 40 0f 41 56 65 4c 8b 0d 9f 19 7e 12 4d 89 f8 4c 89 e1 48 c7 c6 40 e9 cf 8b <67> 48 0f b9 3a e8 30 f4 33 03 59 bf 01 00 00 00 e8 35 80 f0 ff 48
RSP: 0018:ffffc90006c37ab0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88804cd1bb18 RCX: ffff88804cd1bb18
RDX: 0000000000000000 RSI: ffffffff8bcfe940 RDI: ffffffff91255160
RBP: ffff88804cd1bb20 R08: 0000000000000000 R09: ffff8880333a3e00
R10: ffff88804cd1bb1f R11: 0000000000000000 R12: ffff88804cd1bb18
R13: ffffffff9121f080 R14: ffffffff8bcfe760 R15: 0000000000000000
FS: 00007f4b1dae76c0(0000) GS:ffff888123eec000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe840755690 CR3: 00000000749d6000 CR4: 0000000000350ef0
Call Trace:
<TASK>
inode_unlock include/linux/fs.h:1034 [inline]
vfs_set_acl+0x359/0x9e0 fs/posix_acl.c:1150
do_set_acl+0xd9/0x1a0 fs/posix_acl.c:1286
do_setxattr+0xeb/0x180 fs/xattr.c:659
filename_setxattr+0x167/0x1d0 fs/xattr.c:690
path_setxattrat+0x1ff/0x3b0 fs/xattr.c:734
__do_sys_lsetxattr fs/xattr.c:775 [inline]
__se_sys_lsetxattr fs/xattr.c:771 [inline]
__x64_sys_lsetxattr+0xc9/0x140 fs/xattr.c:771
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b1cb9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f4b1dae7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f4b1ce26090 RCX: 00007f4b1cb9e0d9
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 0000200000000140
RBP: 00007f4b1cc35024 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000001c R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b1ce26128 R14: 00007f4b1ce26090 R15: 00007ffc21800e38
</TASK>
----------------
Code disassembly (best guess):
0: 3c 02 cmp $0x2,%al
2: 00 0f add %cl,(%rdi)
4: 85 3e test %edi,(%rsi)
6: 03 00 add (%rax),%eax
8: 00 48 8b add %cl,-0x75(%rax)
b: 13 48 8d adc -0x73(%rax),%ecx
e: 3d f1 2a 40 0f cmp $0xf402af1,%eax
13: 41 56 push %r14
15: 65 4c 8b 0d 9f 19 7e mov %gs:0x127e199f(%rip),%r9 # 0x127e19bc
1c: 12
1d: 4d 89 f8 mov %r15,%r8
20: 4c 89 e1 mov %r12,%rcx
23: 48 c7 c6 40 e9 cf 8b mov $0xffffffff8bcfe940,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: e8 30 f4 33 03 call 0x333f464
34: 59 pop %rcx
35: bf 01 00 00 00 mov $0x1,%edi
3a: e8 35 80 f0 ff call 0xfff08074
3f: 48 rex.W


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