Oops: general protection fault, probably for non-canonical address 0xdffffc0000000104: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000820-0x0000000000000827]
CPU: 0 UID: 0 PID: 9896 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2665 [inline]
RIP: 0010:diRead+0x151/0xb90 fs/jfs/jfs_imap.c:316
Code: 89 f0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 b5 09 df fe 4c 89 64 24 50 4d 8b 36 4d 8d be 20 08 00 00 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 91 09 df fe 4d 8b 2f 4d 8d 7d 28 4c
RSP: 0018:ffffc90004a6f6d8 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000006 RCX: ffffffff819ead1a
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90004a6f660
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200094decc R12: ffff88805efef940
R13: ffff88803dc39d38 R14: 0000000000000000 R15: 0000000000000820
FS:  000055557995b500(0000) GS:ffff88812659c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555579986aa8 CR3: 000000004d29c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_iget+0x89/0x470 fs/jfs/inode.c:35
 jfs_lookup+0x220/0x420 fs/jfs/namei.c:1470
 __lookup_slow+0x2d2/0x440 fs/namei.c:1916
 lookup_slow+0x53/0x70 fs/namei.c:1933
 walk_component fs/namei.c:2279 [inline]
 lookup_last fs/namei.c:2780 [inline]
 path_lookupat+0x3f5/0x8c0 fs/namei.c:2804
 filename_lookup+0x256/0x5d0 fs/namei.c:2833
 user_path_at+0x40/0x160 fs/namei.c:3612
 ksys_umount fs/namespace.c:2052 [inline]
 __do_sys_umount fs/namespace.c:2060 [inline]
 __se_sys_umount fs/namespace.c:2058 [inline]
 __x64_sys_umount+0xf6/0x170 fs/namespace.c:2058
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdb481cd1d7
Code: a2 c7 05 bc e3 24 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:00007ffcb913dad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdb481cd1d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcb913db90
RBP: 00007ffcb913db90 R08: 00007ffcb913eb90 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcb913ec80
R13: 00007fdb48261c3b R14: 00000000000b082e R15: 00007ffcb913fd50
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2665 [inline]
RIP: 0010:diRead+0x151/0xb90 fs/jfs/jfs_imap.c:316
Code: 89 f0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 b5 09 df fe 4c 89 64 24 50 4d 8b 36 4d 8d be 20 08 00 00 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 91 09 df fe 4d 8b 2f 4d 8d 7d 28 4c
RSP: 0018:ffffc90004a6f6d8 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000006 RCX: ffffffff819ead1a
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90004a6f660
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200094decc R12: ffff88805efef940
R13: ffff88803dc39d38 R14: 0000000000000000 R15: 0000000000000820
FS:  000055557995b500(0000) GS:ffff88812659c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555579986aa8 CR3: 000000004d29c000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	89 f0                	mov    %esi,%eax
   2:	48 c1 e8 03          	shr    $0x3,%rax
   6:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
   a:	74 08                	je     0x14
   c:	4c 89 f7             	mov    %r14,%rdi
   f:	e8 b5 09 df fe       	call   0xfedf09c9
  14:	4c 89 64 24 50       	mov    %r12,0x50(%rsp)
  19:	4d 8b 36             	mov    (%r14),%r14
  1c:	4d 8d be 20 08 00 00 	lea    0x820(%r14),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 91 09 df fe       	call   0xfedf09c9
  38:	4d 8b 2f             	mov    (%r15),%r13
  3b:	4d 8d 7d 28          	lea    0x28(%r13),%r15
  3f:	4c                   	rex.WR