loop0: detected capacity change from 0 to 32768
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 5186 Comm: syz-executor.0 Not tainted 6.6.0-rc4-next-20231005-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:lbmStartIO+0xb7/0x3a0 fs/jfs/jfs_logmgr.c:2116
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cf 02 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5c 24 20 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 86 02 00 00 48 8b 3b ba 01 08 00 00 b9 40 0c 00
RSP: 0018:ffffc90004467ab0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003e1b000
RDX: 0000000000000000 RSI: ffffffff82fd7261 RDI: ffff8880267e9020
RBP: ffff88814a706700 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000002 R11: ffffffff910e6d88 R12: ffff8880267e9000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f848686b6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c24000 CR3: 000000007b1ac000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lbmWrite+0x32e/0x470 fs/jfs/jfs_logmgr.c:2067
 lmGCwrite+0x3f8/0x4f0 fs/jfs/jfs_logmgr.c:785
 lmGroupCommit+0x452/0x890 fs/jfs/jfs_logmgr.c:687
 txCommit+0x12f1/0x4fc0 fs/jfs/jfs_txnmgr.c:1304
 jfs_commit_inode+0x44e/0x570 fs/jfs/inode.c:108
 jfs_fsync+0x128/0x210 fs/jfs/file.c:37
 vfs_fsync_range+0x141/0x220 fs/sync.c:188
 vfs_fsync fs/sync.c:202 [inline]
 do_fsync fs/sync.c:212 [inline]
 __do_sys_fsync fs/sync.c:220 [inline]
 __se_sys_fsync fs/sync.c:218 [inline]
 __x64_sys_fsync+0x72/0xd0 fs/sync.c:218
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8485a7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f848686b0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004a
RAX: ffffffffffffffda RBX: 00007f8485b9bf80 RCX: 00007f8485a7cae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f8485ac847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f8485b9bf80 R15: 00007ffe76229cb8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:lbmStartIO+0xb7/0x3a0 fs/jfs/jfs_logmgr.c:2116
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cf 02 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5c 24 20 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 86 02 00 00 48 8b 3b ba 01 08 00 00 b9 40 0c 00
RSP: 0018:ffffc90004467ab0 EFLAGS: 00010246

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003e1b000
RDX: 0000000000000000 RSI: ffffffff82fd7261 RDI: ffff8880267e9020
RBP: ffff88814a706700 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000002 R11: ffffffff910e6d88 R12: ffff8880267e9000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f848686b6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c26000 CR3: 000000007b1ac000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	fa                   	cli
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   c:	0f 85 cf 02 00 00    	jne    0x2e1
  12:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  19:	fc ff df
  1c:	49 8b 5c 24 20       	mov    0x20(%r12),%rbx
  21:	48 89 da             	mov    %rbx,%rdx
  24:	48 c1 ea 03          	shr    $0x3,%rdx
* 28:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2c:	0f 85 86 02 00 00    	jne    0x2b8
  32:	48 8b 3b             	mov    (%rbx),%rdi
  35:	ba 01 08 00 00       	mov    $0x801,%edx
  3a:	b9                   	.byte 0xb9
  3b:	40 0c 00             	rex or $0x0,%al