Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 UID: 0 PID: 5595 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:diRead+0x41e/0xbc0 fs/jfs/jfs_imap.c:342
Code: 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 ba 51 cf fe 49 8b 1f 48 83 c3 34 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 ca 05 00 00 8b 1b bf 40 00 00 00 89 de e8
RSP: 0018:ffffc90004bff7f8 EFLAGS: 00010207
RAX: 0000000000000006 RBX: 0000000000000034 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c296760 R12: 0000000000000000
R13: 0000000000000000 R14: 000000000000001c R15: ffff8880267192a0
FS:  000055558f027500(0000) GS:ffff888125bc2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffcc2eec30 CR3: 0000000053424000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_iget+0x89/0x470 fs/jfs/inode.c:35
 jfs_lookup+0x220/0x420 fs/jfs/namei.c:1472
 __lookup_slow+0x1fb/0x2f0 fs/namei.c:1919
 lookup_slow+0x53/0x70 fs/namei.c:1936
 walk_component fs/namei.c:2282 [inline]
 lookup_last fs/namei.c:2789 [inline]
 path_lookupat+0x3f5/0x8c0 fs/namei.c:2813
 filename_lookup+0x265/0x5d0 fs/namei.c:2842
 user_path_at+0x40/0x160 fs/namei.c:3641
 ksys_umount fs/namespace.c:2067 [inline]
 __do_sys_umount fs/namespace.c:2075 [inline]
 __se_sys_umount fs/namespace.c:2073 [inline]
 __x64_sys_umount+0xf6/0x170 fs/namespace.c:2073
 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: 0033:0x7f217d6af3d7
Code: a2 c7 05 1c 63 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fffcc2ef288 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f217d744d23 RCX: 00007f217d6af3d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffcc2ef340
RBP: 00007fffcc2ef340 R08: 00007fffcc2f0340 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffcc2f0430
R13: 00007f217d744d23 R14: 000000000002eed1 R15: 00007fffcc2f1500
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:diRead+0x41e/0xbc0 fs/jfs/jfs_imap.c:342
Code: 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 ba 51 cf fe 49 8b 1f 48 83 c3 34 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 ca 05 00 00 8b 1b bf 40 00 00 00 89 de e8
RSP: 0018:ffffc90004bff7f8 EFLAGS: 00010207
RAX: 0000000000000006 RBX: 0000000000000034 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c296760 R12: 0000000000000000
R13: 0000000000000000 R14: 000000000000001c R15: ffff8880267192a0
FS:  000055558f027500(0000) GS:ffff888125bc2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555576910a28 CR3: 0000000053424000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	00 fc                	add    %bh,%ah
   2:	ff                   	lcall  (bad)
   3:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   9:	08 4c 89 ff          	or     %cl,-0x1(%rcx,%rcx,4)
   d:	e8 ba 51 cf fe       	call   0xfecf51cc
  12:	49 8b 1f             	mov    (%r15),%rbx
  15:	48 83 c3 34          	add    $0x34,%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 ca 05 00 00    	jne    0x600
  36:	8b 1b                	mov    (%rbx),%ebx
  38:	bf 40 00 00 00       	mov    $0x40,%edi
  3d:	89 de                	mov    %ebx,%esi
  3f:	e8                   	.byte 0xe8