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: 2 UID: 0 PID: 5943 Comm: syz-executor Not tainted 6.14.0-rc6-syzkaller-00115-ge3a854b577cb #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:afs_atcell_get_link+0x33e/0x480 fs/afs/dynroot.c:321
Code: 89 c3 89 c6 e8 53 8a 3c fe 85 db 75 64 e8 4a 8f 3c 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:ffffc900039bf978 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff837d616a
RDX: 0000000000000056 RSI: ffffffff837d60f6 RDI: 00000000000002b0
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888067c75000 R14: 0000000000000003 R15: ffff88804c329480
FS:  0000000000000000(0000) GS:ffff88802b600000(0063) knlGS:0000000057d65440
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000057d7a9bc CR3: 000000004f050000 CR4: 0000000000352ef0
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_compat_sys_openat fs/open.c:1505 [inline]
 __se_compat_sys_openat fs/open.c:1503 [inline]
 __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1503
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:387
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf73be579
Code: b8 01 10 06 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 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000fff16720 EFLAGS: 00000293 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000fff167f0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f73acff4
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:afs_atcell_get_link+0x33e/0x480 fs/afs/dynroot.c:321
Code: 89 c3 89 c6 e8 53 8a 3c fe 85 db 75 64 e8 4a 8f 3c 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:ffffc900039bf978 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff837d616a
RDX: 0000000000000056 RSI: ffffffff837d60f6 RDI: 00000000000002b0
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888067c75000 R14: 0000000000000003 R15: ffff88804c329480
FS:  0000000000000000(0000) GS:ffff88802b600000(0063) knlGS:0000000057d65440
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000057d7a9bc CR3: 000000004f050000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 c3                	mov    %eax,%ebx
   2:	89 c6                	mov    %eax,%esi
   4:	e8 53 8a 3c fe       	call   0xfe3c8a5c
   9:	85 db                	test   %ebx,%ebx
   b:	75 64                	jne    0x71
   d:	e8 4a 8f 3c fe       	call   0xfe3c8f5c
  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