syzbot

ERROR: (device loop0): release_metapage: metapage_write_one() failed
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: 6072 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:metapage_write_folio+0xa8/0xca0 fs/jfs/jfs_metapage.c:428
Code: e8 3d cf 83 fe 4d 8d 74 24 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 42 75 e5 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 29 75 e5 fe 49 8b 1e 4d 8d 74 24
RSP: 0018:ffffc90003e97240 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffffd40001adf9e RCX: ffff88802a4bda00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003e97350 R08: ffffea0000d6fcf7 R09: 1ffffd40001adf9e
R10: dffffc0000000000 R11: fffff940001adf9f R12: ffffea0000d6fcc0
R13: 0000000000000083 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f23c6e5e6c0(0000) GS:ffff88812713b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff79f1d6286 CR3: 000000003c896000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 metapage_write_one+0x24c/0x450 fs/jfs/jfs_metapage.c:818
 force_metapage+0x1a7/0x360 fs/jfs/jfs_metapage.c:840
 txForce fs/jfs/jfs_txnmgr.c:2215 [inline]
 txCommit+0x4c05/0x5430 fs/jfs/jfs_txnmgr.c:1315
 duplicateIXtree+0x292/0x490 fs/jfs/jfs_imap.c:3019
 diNewIAG fs/jfs/jfs_imap.c:2597 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0x17a7/0x1df0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1d4/0x1670 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x193/0xa70 fs/jfs/namei.c:225
 vfs_mkdir+0x306/0x510 fs/namei.c:4453
 do_mkdirat+0x247/0x590 fs/namei.c:4486
 __do_sys_mkdir fs/namei.c:4508 [inline]
 __se_sys_mkdir fs/namei.c:4506 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4506
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f23c77eeec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f23c6e5e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f23c7a45fa0 RCX: 00007f23c77eeec9
RDX: 0000000000000000 RSI: 00000000000000c4 RDI: 0000200000000280
RBP: 00007f23c7871f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f23c7a46038 R14: 00007f23c7a45fa0 R15: 00007ffdf66a7768
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:metapage_write_folio+0xa8/0xca0 fs/jfs/jfs_metapage.c:428
Code: e8 3d cf 83 fe 4d 8d 74 24 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 42 75 e5 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 29 75 e5 fe 49 8b 1e 4d 8d 74 24
RSP: 0018:ffffc90003e97240 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffffd40001adf9e RCX: ffff88802a4bda00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003e97350 R08: ffffea0000d6fcf7 R09: 1ffffd40001adf9e
R10: dffffc0000000000 R11: fffff940001adf9f R12: ffffea0000d6fcc0
R13: 0000000000000083 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f23c6e5e6c0(0000) GS:ffff88812713b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff79f1d6286 CR3: 000000003c896000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	e8 3d cf 83 fe       	call   0xfe83cf42
   5:	4d 8d 74 24 18       	lea    0x18(%r12),%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 42 75 e5 fe       	call   0xfee57562
  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 29 75 e5 fe       	call   0xfee57562
  39:	49 8b 1e             	mov    (%r14),%rbx
  3c:	4d                   	rex.WRB
  3d:	8d                   	.byte 0x8d
  3e:	74 24                	je     0x64