loop0: detected capacity change from 0 to 32768
syz.0.19: attempt to access beyond end of device
loop0: rw=1, sector=4680032, nr_sectors = 8 limit=32768
metapage_write_end_io: I/O error
ERROR: (device loop0): release_metapage: metapage_write_one() failed
ERROR: (device loop0): remounting filesystem as read-only
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: 6631 Comm: syz.0.19 Not tainted 6.15.0-rc6-syzkaller-00025-g627277ba7c23 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:metapage_write_folio+0xa8/0xca0 fs/jfs/jfs_metapage.c:346
Code: e8 6d f0 85 fe 4d 8d 74 24 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 62 bf e5 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 49 bf e5 fe 49 8b 1e 4d 8d 74 24
RSP: 0018:ffffc90003177340 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffffd400018a2d6 RCX: ffff88802f048000
RDX: 0000000000000000 RSI: ffffc900031774a0 RDI: ffffea0000c51680
RBP: ffffc90003177450 R08: ffffea0000c516b7 R09: 1ffffd400018a2d6
R10: dffffc0000000000 R11: fffff9400018a2d7 R12: ffffea0000c51680
R13: 0000000000000082 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007fb287a3d6c0(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb287a1bf98 CR3: 000000002ff1a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 metapage_write_one+0x244/0x440 fs/jfs/jfs_metapage.c:710
 force_metapage+0x1a7/0x360 fs/jfs/jfs_metapage.c:732
 txForce fs/jfs/jfs_txnmgr.c:2215 [inline]
 txCommit+0x4c05/0x5430 fs/jfs/jfs_txnmgr.c:1315
 diNewIAG fs/jfs/jfs_imap.c:2592 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0x1770/0x1df0 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+0x193/0xa70 fs/jfs/namei.c:225
 vfs_mkdir+0x303/0x510 fs/namei.c:4359
 do_mkdirat+0x247/0x590 fs/namei.c:4392
 __do_sys_mkdir fs/namei.c:4414 [inline]
 __se_sys_mkdir fs/namei.c:4412 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4412
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb286b8cda9
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:00007fb287a3d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fb286da5fa0 RCX: 00007fb286b8cda9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000200003c0
RBP: 00007fb286c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb286da5fa0 R15: 00007ffca1569d38
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:metapage_write_folio+0xa8/0xca0 fs/jfs/jfs_metapage.c:346
Code: e8 6d f0 85 fe 4d 8d 74 24 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 62 bf e5 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 49 bf e5 fe 49 8b 1e 4d 8d 74 24
RSP: 0018:ffffc90003177340 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffffd400018a2d6 RCX: ffff88802f048000
RDX: 0000000000000000 RSI: ffffc900031774a0 RDI: ffffea0000c51680
RBP: ffffc90003177450 R08: ffffea0000c516b7 R09: 1ffffd400018a2d6
R10: dffffc0000000000 R11: fffff9400018a2d7 R12: ffffea0000c51680
R13: 0000000000000082 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007fb287a3d6c0(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd88cb4c000 CR3: 000000002ff1a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 6d f0 85 fe       	call   0xfe85f072
   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 62 bf e5 fe       	call   0xfee5bf82
  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 49 bf e5 fe       	call   0xfee5bf82
  39:	49 8b 1e             	mov    (%r14),%rbx
  3c:	4d                   	rex.WRB
  3d:	8d                   	.byte 0x8d
  3e:	74 24                	je     0x64