Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:xtLog fs/jfs/jfs_txnmgr.c:1687 [inline]
RIP: 0010:txLog fs/jfs/jfs_txnmgr.c:1398 [inline]
RIP: 0010:txCommit+0x16e8/0x54a0 fs/jfs/jfs_txnmgr.c:1266
Code: c0 c1 e0 0b 83 c8 12 66 89 84 24 40 01 00 00 48 ba 00 00 00 00 00 fc ff df 4c 89 64 24 50 4d 8d 74 24 12 4c 89 f0 48 c1 e8 03 <0f> b6 04 10 84 c0 0f 85 0a 22 00 00 41 0f b7 06 48 89 44 24 30 41
RSP: 0018:ffffc9000f97f5e0 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 000000000000002d RCX: 0000000000100000
RDX: dffffc0000000000 RSI: 000000000000135b RDI: 000000000000135c
RBP: ffffc9000f97f7b0 R08: ffff888012e74b00 R09: 0000000000000005
R10: 000000000000000f R11: 0000000000000002 R12: 0000000000000000
R13: ffffc900010c2000 R14: 0000000000000012 R15: 1ffff9200021842d
FS:  00007f5204dbe6c0(0000) GS:ffff88808c2c6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000003b000 CR3: 00000000444e5000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 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+0x17b4/0x1de0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1e2/0x16b0 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8e0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x1dd/0xaf0 fs/jfs/namei.c:226
 vfs_mkdir+0x40c/0x620 fs/namei.c:5410
 filename_mkdirat+0x285/0x510 fs/namei.c:5443
 __do_sys_mkdir fs/namei.c:5470 [inline]
 __se_sys_mkdir+0x34/0x150 fs/namei.c:5467
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5203f9e159
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:00007f5204dbdfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f5204226180 RCX: 00007f5203f9e159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007f520403503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5204226218 R14: 00007f5204226180 R15: 00007fff353bfa88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:xtLog fs/jfs/jfs_txnmgr.c:1687 [inline]
RIP: 0010:txLog fs/jfs/jfs_txnmgr.c:1398 [inline]
RIP: 0010:txCommit+0x16e8/0x54a0 fs/jfs/jfs_txnmgr.c:1266
Code: c0 c1 e0 0b 83 c8 12 66 89 84 24 40 01 00 00 48 ba 00 00 00 00 00 fc ff df 4c 89 64 24 50 4d 8d 74 24 12 4c 89 f0 48 c1 e8 03 <0f> b6 04 10 84 c0 0f 85 0a 22 00 00 41 0f b7 06 48 89 44 24 30 41
RSP: 0018:ffffc9000f97f5e0 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 000000000000002d RCX: 0000000000100000
RDX: dffffc0000000000 RSI: 000000000000135b RDI: 000000000000135c
RBP: ffffc9000f97f7b0 R08: ffff888012e74b00 R09: 0000000000000005
R10: 000000000000000f R11: 0000000000000002 R12: 0000000000000000
R13: ffffc900010c2000 R14: 0000000000000012 R15: 1ffff9200021842d
FS:  00007f5204dbe6c0(0000) GS:ffff88808c2c6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000c7000 CR3: 00000000444e5000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	c0 c1 e0             	rol    $0xe0,%cl
   3:	0b 83 c8 12 66 89    	or     -0x7699ed38(%rbx),%eax
   9:	84 24 40             	test   %ah,(%rax,%rax,2)
   c:	01 00                	add    %eax,(%rax)
   e:	00 48 ba             	add    %cl,-0x46(%rax)
  11:	00 00                	add    %al,(%rax)
  13:	00 00                	add    %al,(%rax)
  15:	00 fc                	add    %bh,%ah
  17:	ff                   	lcall  (bad)
  18:	df 4c 89 64          	fisttps 0x64(%rcx,%rcx,4)
  1c:	24 50                	and    $0x50,%al
  1e:	4d 8d 74 24 12       	lea    0x12(%r12),%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 10          	movzbl (%rax,%rdx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 0a 22 00 00    	jne    0x2240
  36:	41 0f b7 06          	movzwl (%r14),%eax
  3a:	48 89 44 24 30       	mov    %rax,0x30(%rsp)
  3f:	41                   	rex.B