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: 7188 Comm: syz.5.227 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:metapage_write_folio+0xa7/0xcf0 fs/jfs/jfs_metapage.c:429
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 b3 53 d4 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 9a 53 d4 fe 49 8b 1e 43 c6 44 3c
RSP: 0018:ffffc90005d4f2e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffea0000b061c0 RCX: 0000000000080000
RDX: ffffc9001cb5e000 RSI: 0000000000001fea RDI: 0000000000001feb
RBP: ffffc90005d4f3f0 R08: ffffea0000b061f7 R09: 1ffffd4000160c3e
R10: dffffc0000000000 R11: fffff94000160c3f R12: 1ffff92000ba9e68
R13: ffffea0000b061c0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f7e417ce6c0(0000) GS:ffff888126279000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f49bdbe6000 CR3: 000000001fb56000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 metapage_write_one+0x2c8/0x520 fs/jfs/jfs_metapage.c:819
 force_metapage+0x1a7/0x360 fs/jfs/jfs_metapage.c:841
 txForce fs/jfs/jfs_txnmgr.c:2217 [inline]
 txCommit+0x4bce/0x5410 fs/jfs/jfs_txnmgr.c:1317
 diNewIAG fs/jfs/jfs_imap.c:2592 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0x1767/0x1db0 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+0x1e1/0xb00 fs/jfs/namei.c:226
 vfs_mkdir+0x40b/0x630 fs/namei.c:5261
 filename_mkdirat+0x289/0x520 fs/namei.c:5294
 __do_sys_mkdirat fs/namei.c:5315 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5312
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e4357bc47
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007f7e417cde58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f7e417cdee0 RCX: 00007f7e4357bc47
RDX: 00000000000001ff RSI: 00002000000000c0 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007f7e417cdea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:metapage_write_folio+0xa7/0xcf0 fs/jfs/jfs_metapage.c:429
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 b3 53 d4 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 9a 53 d4 fe 49 8b 1e 43 c6 44 3c
RSP: 0018:ffffc90005d4f2e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffea0000b061c0 RCX: 0000000000080000
RDX: ffffc9001cb5e000 RSI: 0000000000001fea RDI: 0000000000001feb
RBP: ffffc90005d4f3f0 R08: ffffea0000b061f7 R09: 1ffffd4000160c3e
R10: dffffc0000000000 R11: fffff94000160c3f R12: 1ffff92000ba9e68
R13: ffffea0000b061c0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f7e417ce6c0(0000) GS:ffff888126279000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f49bdbe6000 CR3: 000000001fb56000 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 b3 53 d4 fe       	call   0xfed453d3
  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 9a 53 d4 fe       	call   0xfed453d3
  39:	49 8b 1e             	mov    (%r14),%rbx
  3c:	43                   	rex.XB
  3d:	c6                   	.byte 0xc6
  3e:	44                   	rex.R
  3f:	3c                   	.byte 0x3c