Oops: general protection fault, probably for non-canonical address 0xdffffc0000000056: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000002b0-0x00000000000002b7]
CPU: 0 UID: 0 PID: 5821 Comm: syz-executor Not tainted 6.14.0-rc6-syzkaller-00202-ga29967be967e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:afs_atcell_get_link+0x33e/0x480 fs/afs/dynroot.c:321
Code: 89 c3 89 c6 e8 53 ae 3b fe 85 db 75 64 e8 4a b3 3b fe 48 8d bd b0 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1f 01 00 00 4c 89 f6 bf 03 00 00 00 4c 8b a5 b0
RSP: 0018:ffffc90003517988 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff837e3f8a
RDX: 0000000000000056 RSI: ffffffff837e3f16 RDI: 00000000000002b0
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8880652d7000 R14: 0000000000000003 R15: ffff88804d1b9480
FS:  000055557b43f500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c390811 CR3: 000000002a62c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pick_link fs/namei.c:1914 [inline]
 step_into+0x1982/0x2220 fs/namei.c:1984
 open_last_lookups fs/namei.c:3777 [inline]
 path_openat+0x74c/0x2d80 fs/namei.c:3986
 do_filp_open+0x20c/0x470 fs/namei.c:4016
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1428
 do_sys_open fs/open.c:1443 [inline]
 __do_sys_openat fs/open.c:1459 [inline]
 __se_sys_openat fs/open.c:1454 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1454
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcca318bad0
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44
RSP: 002b:00007ffd98eb9e40 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcca318bad0
RDX: 0000000000000000 RSI: 00007ffd98eb9f70 RDI: 00000000ffffff9c
RBP: 00007ffd98eb9f70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffd98ebb060
R13: 00007fcca320e08c R14: 000055557b43f4a8 R15: 00007ffd98ebc130
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:afs_atcell_get_link+0x33e/0x480 fs/afs/dynroot.c:321
Kernel Offset: disabled
----------------
Code disassembly (best guess):
   0:	89 c3                	mov    %eax,%ebx
   2:	89 c6                	mov    %eax,%esi
   4:	e8 53 ae 3b fe       	call   0xfe3bae5c
   9:	85 db                	test   %ebx,%ebx
   b:	75 64                	jne    0x71
   d:	e8 4a b3 3b fe       	call   0xfe3bb35c
  12:	48 8d bd b0 02 00 00 	lea    0x2b0(%rbp),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  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 1f 01 00 00    	jne    0x153
  34:	4c 89 f6             	mov    %r14,%rsi
  37:	bf 03 00 00 00       	mov    $0x3,%edi
  3c:	4c                   	rex.WR
  3d:	8b                   	.byte 0x8b
  3e:	a5                   	movsl  %ds:(%rsi),%es:(%rdi)
  3f:	b0                   	.byte 0xb0