general protection fault, probably for non-canonical address 0xdffffc00000000bb: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000005d8-0x00000000000005df]
CPU: 0 PID: 7837 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1850 [inline]
RIP: 0010:bio_associate_blkg_from_css+0x2b6/0x9d0 block/blk-cgroup.c:1884
Code: fc ff df 80 3c 08 00 74 08 4c 89 ff e8 03 c4 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 dc c3 e7 fd 41 be 90 00 00 00 4c 03
RSP: 0018:ffffc90002277a98 EFLAGS: 00010206
RAX: 00000000000000bb RBX: 00000000000005d8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8a7a2a20 RDI: ffffffff8a7a29e0
RBP: ffff88807c5e3110 R08: dffffc0000000000 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: ffff88807c5e3000
R13: 1ffff1100f4b7e79 R14: dffffc0000000000 R15: ffff88807a5bf3c8
FS:  0000555563ac0500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdad3cbe580 CR3: 000000001b196000 CR4: 00000000003506f0
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_sync_fs+0x79/0xa0 fs/jfs/super.c:689
 sync_filesystem+0xe6/0x220 fs/sync.c:56
 generic_shutdown_super+0x6b/0x300 fs/super.c:448
 kill_block_super+0x7c/0xe0 fs/super.c:1427
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x426/0x4d0 fs/namespace.c:1148
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc147bf00d7
Code: a2 c7 05 1c 26 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffef5c50358 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fc147c8430a RCX: 00007fc147bf00d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffef5c50410
RBP: 00007ffef5c50410 R08: 00007ffef5c51410 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffef5c514a0
R13: 00007fc147c8430a R14: 0000000000044e03 R15: 00007ffef5c514e0
 </TASK>
Modules linked in:
---[ end trace be5b25b869249c95 ]---
RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1850 [inline]
RIP: 0010:bio_associate_blkg_from_css+0x2b6/0x9d0 block/blk-cgroup.c:1884
Code: fc ff df 80 3c 08 00 74 08 4c 89 ff e8 03 c4 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 dc c3 e7 fd 41 be 90 00 00 00 4c 03
RSP: 0018:ffffc90002277a98 EFLAGS: 00010206
RAX: 00000000000000bb RBX: 00000000000005d8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8a7a2a20 RDI: ffffffff8a7a29e0
RBP: ffff88807c5e3110 R08: dffffc0000000000 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: ffff88807c5e3000
R13: 1ffff1100f4b7e79 R14: dffffc0000000000 R15: ffff88807a5bf3c8
FS:  0000555563ac0500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2db18ff8 CR3: 000000001b196000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fc                   	cld
   1:	ff                   	lcall  (bad)
   2:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   8:	08 4c 89 ff          	or     %cl,-0x1(%rcx,%rcx,4)
   c:	e8 03 c4 e7 fd       	call   0xfde7c414
  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 dc c3 e7 fd       	call   0xfde7c414
  38:	41 be 90 00 00 00    	mov    $0x90,%r14d
  3e:	4c                   	rex.WR
  3f:	03                   	.byte 0x3