BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 800000010571e067 P4D 800000010571e067 PUD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 PID: 2847 Comm: syz-executor Not tainted 6.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:list_add_tail include/linux/list.h:183 [inline]
RIP: 0010:list_lru_add+0xa5/0x130 mm/list_lru.c:97
Code: 8d 7f 20 e8 7d 0d 67 01 48 89 da 48 85 c0 48 8b 4c 24 10 48 8d 0c 49 48 8d 6c c8 10 48 0f 44 e8 eb 08 49 8b 07 4a 8d 6c 20 40 <4c> 8b 7d 08 48 89 d3 48 89 d7 4c 89 fe 48 89 ea e8 a6 fa 7c 00 48
RSP: 0018:ffffc900027efd60 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881778a01b8 RCX: 0000000000000000
RDX: ffff8881778a01b8 RSI: ffffffff8357d113 RDI: ffff888103310000
RBP: 0000000000000000 R08: 00000003fffffffc R09: 0000000000000402
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88810236dc80 R14: 0000000000000000 R15: ffff8881037eb7e0
FS:  000055557cc02500(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000104f02000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __inode_add_lru fs/inode.c:467 [inline]
 iput_final fs/inode.c:1718 [inline]
 iput+0x22b/0x260 fs/inode.c:1767
 __dentry_kill+0xa2/0x1d0 fs/dcache.c:603
 dput+0x75/0xe0 fs/dcache.c:845
 shrink_dcache_for_umount+0x24/0x70 fs/dcache.c:1555
 generic_shutdown_super+0x1d/0x110 fs/super.c:620
 bch2_kill_sb+0x11/0x20 fs/bcachefs/fs.c:2050
 deactivate_locked_super+0x33/0x150 fs/super.c:473
 cleanup_mnt+0xdc/0x120 fs/namespace.c:1267
 task_work_run+0x82/0xb0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xb5/0x1c0 kernel/entry/common.c:218
 do_syscall_64+0x9a/0x1a0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f14bc976f07
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 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 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffdf0de9038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f14bc976f07
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdf0de90f0
RBP: 00007ffdf0de90f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdf0dea1b0
R13: 00007f14bc9e3515 R14: 000000000000e699 R15: 000000000000e699
 </TASK>
Modules linked in:
CR2: 0000000000000008
---[ end trace 0000000000000000 ]---
RIP: 0010:list_add_tail include/linux/list.h:183 [inline]
RIP: 0010:list_lru_add+0xa5/0x130 mm/list_lru.c:97
Code: 8d 7f 20 e8 7d 0d 67 01 48 89 da 48 85 c0 48 8b 4c 24 10 48 8d 0c 49 48 8d 6c c8 10 48 0f 44 e8 eb 08 49 8b 07 4a 8d 6c 20 40 <4c> 8b 7d 08 48 89 d3 48 89 d7 4c 89 fe 48 89 ea e8 a6 fa 7c 00 48
RSP: 0018:ffffc900027efd60 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881778a01b8 RCX: 0000000000000000
RDX: ffff8881778a01b8 RSI: ffffffff8357d113 RDI: ffff888103310000
RBP: 0000000000000000 R08: 00000003fffffffc R09: 0000000000000402
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88810236dc80 R14: 0000000000000000 R15: ffff8881037eb7e0
FS:  000055557cc02500(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000104f02000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 7f 20             	lea    0x20(%rdi),%edi
   3:	e8 7d 0d 67 01       	call   0x1670d85
   8:	48 89 da             	mov    %rbx,%rdx
   b:	48 85 c0             	test   %rax,%rax
   e:	48 8b 4c 24 10       	mov    0x10(%rsp),%rcx
  13:	48 8d 0c 49          	lea    (%rcx,%rcx,2),%rcx
  17:	48 8d 6c c8 10       	lea    0x10(%rax,%rcx,8),%rbp
  1c:	48 0f 44 e8          	cmove  %rax,%rbp
  20:	eb 08                	jmp    0x2a
  22:	49 8b 07             	mov    (%r15),%rax
  25:	4a 8d 6c 20 40       	lea    0x40(%rax,%r12,1),%rbp
* 2a:	4c 8b 7d 08          	mov    0x8(%rbp),%r15 <-- trapping instruction
  2e:	48 89 d3             	mov    %rdx,%rbx
  31:	48 89 d7             	mov    %rdx,%rdi
  34:	4c 89 fe             	mov    %r15,%rsi
  37:	48 89 ea             	mov    %rbp,%rdx
  3a:	e8 a6 fa 7c 00       	call   0x7cfae5
  3f:	48                   	rex.W