Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 6490 Comm: syz-executor.1 Not tainted 6.18.0-rc7-next-20251128 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:__fput+0x1cc/0xb50
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f6 08 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 7e 68 49 8d 7f 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c9 08 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffff88804b037e08 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: ffff888015ee6c40 RCX: ffffffff81b955e0
RDX: 0000000000000005 RSI: ffffffff81b955f2 RDI: 0000000000000028
RBP: ffff888013f24000 R08: 0000000000000000 R09: ffffed1009606fd4
R10: 0000000004000000 R11: 0000000000000001 R12: ffff888013f24040
R13: 0000000000000010 R14: ffff88804a726eb0 R15: 0000000000000000
FS:  00005555849d5400(0000) GS:ffff8880e5368000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200012c7 CR3: 000000001629e000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 fput_close_sync+0x10f/0x230
 __x64_sys_close+0x8f/0x120
 do_syscall_64+0xbf/0x420
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe503c8472b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffc985873e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fe503c8472b
RDX: 00007fe503df6940 RSI: ffffffff84c96491 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2d222c3c
R10: 0000000000000c2e R11: 0000000000000293 R12: 000000000008729e
R13: 00000000000003e8 R14: 00007fe503de4f60 R15: 000000000008728d
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__fput+0x1cc/0xb50
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f6 08 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 7e 68 49 8d 7f 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c9 08 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffff88804b037e08 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: ffff888015ee6c40 RCX: ffffffff81b955e0
RDX: 0000000000000005 RSI: ffffffff81b955f2 RDI: 0000000000000028
RBP: ffff888013f24000 R08: 0000000000000000 R09: ffffed1009606fd4
R10: 0000000004000000 R11: 0000000000000001 R12: ffff888013f24040
R13: 0000000000000010 R14: ffff88804a726eb0 R15: 0000000000000000
FS:  00005555849d5400(0000) GS:ffff8880e5368000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200012c7 CR3: 000000001629e000 CR4: 0000000000350ef0
loop6: detected capacity change from 0 to 4096
FAT-fs (loop6): bogus number of reserved sectors
FAT-fs (loop6): Can't find a valid FAT filesystem
loop4: detected capacity change from 0 to 512
EXT4-fs error (device loop4): __ext4_fill_super:5553: inode #2: comm syz-executor.4: iget: special inode unallocated
EXT4-fs (loop4): get root inode failed
EXT4-fs (loop4): mount failed
----------------
Code disassembly (best guess):
   0:	48 89 fa             	mov    %rdi,%rdx
   3:	48 c1 ea 03          	shr    $0x3,%rdx
   7:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   b:	0f 85 f6 08 00 00    	jne    0x907
  11:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  18:	fc ff df
  1b:	4d 8b 7e 68          	mov    0x68(%r14),%r15
  1f:	49 8d 7f 28          	lea    0x28(%r15),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 c9 08 00 00    	jne    0x8fd
  34:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  3b:	fc ff df
  3e:	49                   	rex.WB
  3f:	8b                   	.byte 0x8b