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: 64 Comm: kworker/u4:4 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
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:diWrite+0x16b/0x1f60 fs/jfs/jfs_imap.c:609
Code: 08 00 74 08 48 89 df e8 43 29 ca fe 81 e5 ff ff ff 00 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 e8 18 00 00 8b 1b 89 ef 89 de e8 ee ab 57
RSP: 0018:ffffc90000b96f00 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 0000000000000010 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 000000000000001c RDI: 0000000000000000
RBP: 0000000000000004 R08: ffff88805b2b8807 R09: 1ffff1100b657100
R10: dffffc0000000000 R11: ffffed100b657101 R12: ffff888014694200
R13: ffff888013e02000 R14: 000000000000001c R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ea79e35388 CR3: 0000000013ecb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 txCommit+0x83a/0x54a0 fs/jfs/jfs_txnmgr.c:1257
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 jfs_write_inode+0x145/0x220 fs/jfs/inode.c:138
 write_inode fs/fs-writeback.c:1623 [inline]
 __writeback_single_inode+0x69d/0x1220 fs/fs-writeback.c:1866
 writeback_sb_inodes+0x9de/0x1b00 fs/fs-writeback.c:2114
 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2190
 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2301
 wb_check_start_all fs/fs-writeback.c:2427 [inline]
 wb_do_writeback fs/fs-writeback.c:2474 [inline]
 wb_workfn+0x980/0x10f0 fs/fs-writeback.c:2512
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	08 00                	or     %al,(%rax)
   2:	74 08                	je     0xc
   4:	48 89 df             	mov    %rbx,%rdi
   7:	e8 43 29 ca fe       	call   0xfeca294f
   c:	81 e5 ff ff ff 00    	and    $0xffffff,%ebp
  12:	48 8b 1b             	mov    (%rbx),%rbx
  15:	48 83 c3 10          	add    $0x10,%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 e8 18 00 00    	jne    0x191e
  36:	8b 1b                	mov    (%rbx),%ebx
  38:	89 ef                	mov    %ebp,%edi
  3a:	89 de                	mov    %ebx,%esi
  3c:	e8                   	.byte 0xe8
  3d:	ee                   	out    %al,(%dx)
  3e:	ab                   	stos   %eax,%es:(%rdi)
  3f:	57                   	push   %rdi