Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 UID: 0 PID: 12362 Comm: syz.3.1906 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:fd_install+0x57/0x3d0 fs/file.c:685
Code: 48 81 c3 48 09 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 67 4f e6 ff 4c 8b 3b 49 8d 5e 40 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 29 03 00 00 8b 1b 89 de 81 e6 00 00 00 01
RSP: 0018:ffffc90005587c40 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000041 RCX: 0000000000080000
RDX: ffffc9000f81b000 RSI: 00000000000000a6 RDI: 00000000000000a7
RBP: dffffc0000000000 R08: ffff8880111243ab R09: 1ffff11002224875
R10: dffffc0000000000 R11: ffffed1002224876 R12: 0000000000000006
R13: 0000000000000006 R14: 0000000000000001 R15: ffff88801e7203c0
FS:  0000000000000000(0000) GS:ffff8881260c0000(0063) knlGS:00000000f5484b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000080022000 CR3: 00000000332cc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 do_mq_open+0x5a0/0x770 ipc/mqueue.c:932
 __do_compat_sys_mq_open ipc/mqueue.c:1515 [inline]
 __se_compat_sys_mq_open ipc/mqueue.c:1505 [inline]
 __ia32_compat_sys_mq_open+0x1f9/0x250 ipc/mqueue.c:1505
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x1f7/0x570 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fd5539
Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f548455c EFLAGS: 00000206 ORIG_RAX: 0000000000000115
RAX: ffffffffffffffda RBX: 00000000800000c0 RCX: 0000000000000840
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fd_install+0x57/0x3d0 fs/file.c:685
Code: 48 81 c3 48 09 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 67 4f e6 ff 4c 8b 3b 49 8d 5e 40 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 29 03 00 00 8b 1b 89 de 81 e6 00 00 00 01
RSP: 0018:ffffc90005587c40 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000041 RCX: 0000000000080000
RDX: ffffc9000f81b000 RSI: 00000000000000a6 RDI: 00000000000000a7
RBP: dffffc0000000000 R08: ffff8880111243ab R09: 1ffff11002224875
R10: dffffc0000000000 R11: ffffed1002224876 R12: 0000000000000006
R13: 0000000000000006 R14: 0000000000000001 R15: ffff88801e7203c0
FS:  0000000000000000(0000) GS:ffff8881261c0000(0063) knlGS:00000000f5484b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000332cc000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	48 81 c3 48 09 00 00 	add    $0x948,%rbx
   7:	48 89 d8             	mov    %rbx,%rax
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 67 4f e6 ff       	call   0xffe64f83
  1c:	4c 8b 3b             	mov    (%rbx),%r15
  1f:	49 8d 5e 40          	lea    0x40(%r14),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 29 03 00 00    	jne    0x35f
  36:	8b 1b                	mov    (%rbx),%ebx
  38:	89 de                	mov    %ebx,%esi
  3a:	81 e6 00 00 00 01    	and    $0x1000000,%esi