EXT4-fs (loop2): I/O error while writing superblock
general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 0 PID: 10918 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:klist_put lib/klist.c:212 [inline]
RIP: 0010:klist_del lib/klist.c:230 [inline]
RIP: 0010:klist_remove+0x169/0x3a0 lib/klist.c:249
Code: 80 3c 04 00 74 08 4c 89 f7 e8 d3 2a 63 f7 4d 8b 3e 49 83 e7 fe 49 8d 7f 58 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 ac 2a 63 f7 49 8b 47 58 48 89 44 24 10 4c 89
RSP: 0018:ffffc900046bf880 EFLAGS: 00010202
RAX: 000000000000000b RBX: ffff888028480000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000058
RBP: ffffc900046bf970 R08: ffffffff8e73a143 R09: 1ffffffff1ce7428
R10: dffffc0000000000 R11: fffffbfff1ce7429 R12: 1ffff11005f08b8c
R13: dffffc0000000000 R14: ffff88802f845c60 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbaf8e81fe8 CR3: 000000007eeeb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000c DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 device_move+0x18e/0x6f0 drivers/base/core.c:4671
 hci_conn_del_sysfs+0xaf/0x160 net/bluetooth/hci_sysfs.c:75
 hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline]
 hci_conn_del+0x8a5/0xc40 net/bluetooth/hci_conn.c:1166
 hci_conn_hash_flush+0x17d/0x220 net/bluetooth/hci_conn.c:2583
 hci_dev_close_sync+0x9a1/0x1150 net/bluetooth/hci_sync.c:5408
 hci_dev_do_close net/bluetooth/hci_core.c:523 [inline]
 hci_unregister_dev+0x21a/0x500 net/bluetooth/hci_core.c:2709
 vhci_release+0x170/0x1c0 drivers/bluetooth/hci_vhci.c:701
 __fput+0x221/0x940 fs/file_table.c:418
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x986/0x2530 kernel/exit.c:890
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1032
 __do_sys_exit_group kernel/exit.c:1043 [inline]
 __se_sys_exit_group kernel/exit.c:1041 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1041
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc567f9e159
Code: Unable to access opcode bytes at 0x7fc567f9e12f.
RSP: 002b:00007fff9775c788 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fc56803452d RCX: 00007fc567f9e159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000010 R08: 0000000000000000 R09: 00007fc5680344bb
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9775da40
R13: 00007fc5680344bb R14: 00005555916ee4e8 R15: 00007fff9775eb10
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:klist_put lib/klist.c:212 [inline]
RIP: 0010:klist_del lib/klist.c:230 [inline]
RIP: 0010:klist_remove+0x169/0x3a0 lib/klist.c:249
Code: 80 3c 04 00 74 08 4c 89 f7 e8 d3 2a 63 f7 4d 8b 3e 49 83 e7 fe 49 8d 7f 58 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 ac 2a 63 f7 49 8b 47 58 48 89 44 24 10 4c 89
RSP: 0018:ffffc900046bf880 EFLAGS: 00010202
RAX: 000000000000000b RBX: ffff888028480000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000058
RBP: ffffc900046bf970 R08: ffffffff8e73a143 R09: 1ffffffff1ce7428
R10: dffffc0000000000 R11: fffffbfff1ce7429 R12: 1ffff11005f08b8c
R13: dffffc0000000000 R14: ffff88802f845c60 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d2edef2f8 CR3: 00000000301fa000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000c DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	80 3c 04 00          	cmpb   $0x0,(%rsp,%rax,1)
   4:	74 08                	je     0xe
   6:	4c 89 f7             	mov    %r14,%rdi
   9:	e8 d3 2a 63 f7       	call   0xf7632ae1
   e:	4d 8b 3e             	mov    (%r14),%r15
  11:	49 83 e7 fe          	and    $0xfffffffffffffffe,%r15
  15:	49 8d 7f 58          	lea    0x58(%r15),%rdi
  19:	48 89 f8             	mov    %rdi,%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 05                	je     0x35
  30:	e8 ac 2a 63 f7       	call   0xf7632ae1
  35:	49 8b 47 58          	mov    0x58(%r15),%rax
  39:	48 89 44 24 10       	mov    %rax,0x10(%rsp)
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89