------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(tmp < 0): count = 0xffffffffffffff00, magic = 0xffff888075f2def8, owner = 0x1, curr 0xffff8880330d1f40, list not empty
WARNING: kernel/locking/rwsem.c:1389 at __up_read+0x39d/0x930 kernel/locking/rwsem.c:1389, CPU#0: syz.0.3294/24971
Modules linked in:
CPU: 0 UID: 0 PID: 24971 Comm: syz.0.3294 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:__up_read+0x499/0x930 kernel/locking/rwsem.c:1389
Code: c7 c2 60 1e 0d 8c 4c 0f 44 d0 48 8b 7c 24 28 48 c7 c6 e0 20 0d 8c 48 8b 54 24 18 48 8b 4c 24 08 4d 89 f8 4c 8b 4c 24 10 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 99 01 39 03 e9 c7 fd ff ff 4c 89 ff
RSP: 0018:ffffc90003def918 EFLAGS: 00010246
RAX: ffffffff8c0d1e80 RBX: 1ffff920007bdf2c RCX: ffff888075f2def8
RDX: ffffffffffffff00 RSI: ffffffff8c0d20e0 RDI: ffffffff907d92f0
RBP: ffffc90003def9e8 R08: 0000000000000001 R09: ffff8880330d1f40
R10: ffffffff8c0d1e80 R11: ffffed100ebe5be1 R12: ffffffffffffff00
R13: 0000000000000000 R14: ffff888075f2df50 R15: 0000000000000001
FS:  00007fb619e996c0(0000) GS:ffff888124cca000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe7af05169 CR3: 00000000347c1000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:1049 [inline]
 lookup_slow+0x5e/0x70 fs/namei.c:1937
 walk_component fs/namei.c:2282 [inline]
 link_path_walk+0xd2a/0x1910 fs/namei.c:2656
 path_lookupat+0xe4/0x8c0 fs/namei.c:2812
 filename_lookup+0x265/0x5d0 fs/namei.c:2842
 user_path_at+0x40/0x160 fs/namei.c:3641
 do_mount fs/namespace.c:4178 [inline]
 __do_sys_mount fs/namespace.c:4397 [inline]
 __se_sys_mount+0x2dc/0x420 fs/namespace.c:4374
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb618f9e159
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:00007fb619e99028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb619226090 RCX: 00007fb618f9e159
RDX: 0000200000000300 RSI: 00002000000005c0 RDI: 0000000000000000
RBP: 00007fb61903506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000001000801 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb619226128 R14: 00007fb619226090 R15: 00007fffd96a8418
 </TASK>
----------------
Code disassembly (best guess):
   0:	c7 c2 60 1e 0d 8c    	mov    $0x8c0d1e60,%edx
   6:	4c 0f 44 d0          	cmove  %rax,%r10
   a:	48 8b 7c 24 28       	mov    0x28(%rsp),%rdi
   f:	48 c7 c6 e0 20 0d 8c 	mov    $0xffffffff8c0d20e0,%rsi
  16:	48 8b 54 24 18       	mov    0x18(%rsp),%rdx
  1b:	48 8b 4c 24 08       	mov    0x8(%rsp),%rcx
  20:	4d 89 f8             	mov    %r15,%r8
  23:	4c 8b 4c 24 10       	mov    0x10(%rsp),%r9
  28:	41 52                	push   %r10
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 83 c4 08          	add    $0x8,%rsp
  33:	e8 99 01 39 03       	call   0x33901d1
  38:	e9 c7 fd ff ff       	jmp    0xfffffe04
  3d:	4c 89 ff             	mov    %r15,%rdi