ERROR: (device loop0): remounting filesystem as read-only
ERROR: (device loop0): diWrite: ixpxd invalid
ERROR: (device loop0): txCommit: 
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 6014 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:metapage_write_folio+0xa7/0xcf0 fs/jfs/jfs_metapage.c:428
Code: fe 48 89 5c 24 18 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 13 aa d2 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 fa a9 d2 fe 49 8b 1e 43 c6 44 3c
RSP: 0018:ffffc90003ae7200 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffea0000cde8c0 RCX: ffff88802f7f8000
RDX: 0000000000000000 RSI: ffffc90003ae7360 RDI: ffffea0000cde8c0
RBP: ffffc90003ae7310 R08: ffffea0000cde8f7 R09: 1ffffd400019bd1e
R10: dffffc0000000000 R11: fffff9400019bd1f R12: 1ffff9200075ce4c
R13: ffffea0000cde8c0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f44ad6dc6c0(0000) GS:ffff888125563000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f44ac7e96c0 CR3: 000000001ef00000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 metapage_write_one+0x2c8/0x520 fs/jfs/jfs_metapage.c:818
 force_metapage+0x1a7/0x360 fs/jfs/jfs_metapage.c:840
 txForce fs/jfs/jfs_txnmgr.c:2216 [inline]
 txCommit+0x4bce/0x5410 fs/jfs/jfs_txnmgr.c:1316
 duplicateIXtree+0x299/0x490 fs/jfs/jfs_imap.c:3019
 diNewIAG fs/jfs/jfs_imap.c:2597 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0x179e/0x1db0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1d5/0x1680 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x1e1/0xb00 fs/jfs/namei.c:226
 vfs_mkdir+0x413/0x630 fs/namei.c:5233
 filename_mkdirat+0x285/0x510 fs/namei.c:5266
 __do_sys_mkdirat fs/namei.c:5287 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5284
 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: 0033:0x7f44ac79bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f44ad6dc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f44aca15fa0 RCX: 00007f44ac79bf79
RDX: 0000000000000000 RSI: 0000200000000840 RDI: ffffffffffffff9c
RBP: 00007f44ac8327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f44aca16038 R14: 00007f44aca15fa0 R15: 00007ffffb2124d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:metapage_write_folio+0xa7/0xcf0 fs/jfs/jfs_metapage.c:428
Code: fe 48 89 5c 24 18 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 13 aa d2 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 fa a9 d2 fe 49 8b 1e 43 c6 44 3c
RSP: 0018:ffffc90003ae7200 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffea0000cde8c0 RCX: ffff88802f7f8000
RDX: 0000000000000000 RSI: ffffc90003ae7360 RDI: ffffea0000cde8c0
RBP: ffffc90003ae7310 R08: ffffea0000cde8f7 R09: 1ffffd400019bd1e
R10: dffffc0000000000 R11: fffff9400019bd1f R12: 1ffff9200075ce4c
R13: ffffea0000cde8c0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f44ad6dc6c0(0000) GS:ffff888125563000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f44ac7e96c0 CR3: 000000001ef00000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	fe 48 89             	decb   -0x77(%rax)
   3:	5c                   	pop    %rsp
   4:	24 18                	and    $0x18,%al
   6:	4c 8d 73 18          	lea    0x18(%rbx),%r14
   a:	4c 89 f0             	mov    %r14,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  16:	74 08                	je     0x20
  18:	4c 89 f7             	mov    %r14,%rdi
  1b:	e8 13 aa d2 fe       	call   0xfed2aa33
  20:	4d 8b 36             	mov    (%r14),%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 fa a9 d2 fe       	call   0xfed2aa33
  39:	49 8b 1e             	mov    (%r14),%rbx
  3c:	43                   	rex.XB
  3d:	c6                   	.byte 0xc6
  3e:	44                   	rex.R
  3f:	3c                   	.byte 0x3c