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: 17393 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2665 [inline]
RIP: 0010:diRead+0x151/0xbc0 fs/jfs/jfs_imap.c:316
Code: 8d 5d 80 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 40 a5 d8 fe 4c 8b 3b 49 8d 9f 20 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 20 a5 d8 fe 4c 8b 2b 49 8d 5d 28
RSP: 0018:ffffc90004d876d8 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000820 RCX: ffffffff819f859a
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90004d87660
RBP: ffff88805f633488 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520009b0ecc R12: dffffc0000000000
R13: ffff888029c54e00 R14: 0000000000000006 R15: 0000000000000000
FS:  0000555566cdf500(0000) GS:ffff8881263a1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566d02a68 CR3: 000000003f116000 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+0x2d2/0x440 fs/namei.c:1915
 lookup_slow+0x53/0x70 fs/namei.c:1932
 walk_component fs/namei.c:2278 [inline]
 lookup_last fs/namei.c:2785 [inline]
 path_lookupat+0x3f5/0x8c0 fs/namei.c:2809
 filename_lookup+0x265/0x5d0 fs/namei.c:2838
 user_path_at+0x40/0x160 fs/namei.c:3643
 ksys_umount fs/namespace.c:2062 [inline]
 __do_sys_umount fs/namespace.c:2070 [inline]
 __se_sys_umount fs/namespace.c:2068 [inline]
 __x64_sys_umount+0xf6/0x170 fs/namespace.c:2068
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa51a5fe097
Code: a2 c7 05 5c 06 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:00007fff056278b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fa51a6921ca RCX: 00007fa51a5fe097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff05627970
RBP: 00007fff05627970 R08: 00007fff05628970 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff05628a60
R13: 00007fa51a6921ca R14: 00000000001537b1 R15: 00007fff05629b30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2665 [inline]
RIP: 0010:diRead+0x151/0xbc0 fs/jfs/jfs_imap.c:316
Code: 8d 5d 80 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 40 a5 d8 fe 4c 8b 3b 49 8d 9f 20 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 20 a5 d8 fe 4c 8b 2b 49 8d 5d 28
RSP: 0018:ffffc90004d876d8 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000820 RCX: ffffffff819f859a
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90004d87660
RBP: ffff88805f633488 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520009b0ecc R12: dffffc0000000000
R13: ffff888029c54e00 R14: 0000000000000006 R15: 0000000000000000
FS:  0000555566cdf500(0000) GS:ffff8881263a1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566d02a68 CR3: 000000003f116000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	8d 5d 80             	lea    -0x80(%rbp),%ebx
   3:	48 89 d8             	mov    %rbx,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
   f:	74 08                	je     0x19
  11:	48 89 df             	mov    %rbx,%rdi
  14:	e8 40 a5 d8 fe       	call   0xfed8a559
  19:	4c 8b 3b             	mov    (%rbx),%r15
  1c:	49 8d 9f 20 08 00 00 	lea    0x820(%r15),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 20 a5 d8 fe       	call   0xfed8a559
  39:	4c 8b 2b             	mov    (%rbx),%r13
  3c:	49 8d 5d 28          	lea    0x28(%r13),%rbx