general protection fault, probably for non-canonical address 0xdffffc00000000bb: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000005d8-0x00000000000005df]
CPU: 1 PID: 144 Comm: kworker/u4:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: writeback wb_workfn (flush-7:5)
RIP: 0010:bio_associate_blkg_from_css+0x128/0x9d0 block/blk-cgroup.c:1886
Code: ff df 41 80 3c 04 00 74 08 4c 89 ff e8 91 c5 e7 fd bb d8 05 00 00 49 03 1f 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 6a c5 e7 fd 41 be 90 00 00 00 4c 03
RSP: 0018:ffffc9000174f258 EFLAGS: 00010206
RAX: 00000000000000bb RBX: 00000000000005d8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff96497e20 RDI: ffff8880295cadc0
RBP: ffffffff96497f30 R08: dffffc0000000000 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: 1ffff110052b95b9
R13: 1ffff110052b95b9 R14: dffffc0000000000 R15: ffff8880295cadc8
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558b7b9a38 CR3: 0000000066be6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bio_associate_blkg+0x23a/0x340 block/blk-cgroup.c:1912
 lbmStartIO+0x20b/0x4d0 fs/jfs/jfs_logmgr.c:2130
 lbmWrite+0x361/0x480 fs/jfs/jfs_logmgr.c:2079
 lmGCwrite fs/jfs/jfs_logmgr.c:-1 [inline]
 jfs_flush_journal+0x537/0xe80 fs/jfs/jfs_logmgr.c:1556
 jfs_write_inode+0x12b/0x220 fs/jfs/inode.c:134
 write_inode fs/fs-writeback.c:1505 [inline]
 __writeback_single_inode+0x6c4/0xda0 fs/fs-writeback.c:1715
 writeback_sb_inodes+0xaaa/0x1750 fs/fs-writeback.c:1940
 wb_writeback+0x44a/0xbc0 fs/fs-writeback.c:2114
 wb_do_writeback fs/fs-writeback.c:2257 [inline]
 wb_workfn+0x43a/0xf20 fs/fs-writeback.c:2298
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace 91b41cddc8d1aa16 ]---
RIP: 0010:bio_associate_blkg_from_css+0x128/0x9d0 block/blk-cgroup.c:1886
Code: ff df 41 80 3c 04 00 74 08 4c 89 ff e8 91 c5 e7 fd bb d8 05 00 00 49 03 1f 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 6a c5 e7 fd 41 be 90 00 00 00 4c 03
RSP: 0018:ffffc9000174f258 EFLAGS: 00010206
RAX: 00000000000000bb RBX: 00000000000005d8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff96497e20 RDI: ffff8880295cadc0
RBP: ffffffff96497f30 R08: dffffc0000000000 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: 1ffff110052b95b9
R13: 1ffff110052b95b9 R14: dffffc0000000000 R15: ffff8880295cadc8
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f261865c000 CR3: 000000007e6a7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ff                   	lcall  (bad)
   1:	df 41 80             	filds  -0x80(%rcx)
   4:	3c 04                	cmp    $0x4,%al
   6:	00 74 08 4c          	add    %dh,0x4c(%rax,%rcx,1)
   a:	89 ff                	mov    %edi,%edi
   c:	e8 91 c5 e7 fd       	call   0xfde7c5a2
  11:	bb d8 05 00 00       	mov    $0x5d8,%ebx
  16:	49 03 1f             	add    (%r15),%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:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 6a c5 e7 fd       	call   0xfde7c5a2
  38:	41 be 90 00 00 00    	mov    $0x90,%r14d
  3e:	4c                   	rex.WR
  3f:	03                   	.byte 0x3