general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 9 Comm: kworker/u16:0 Not tainted 5.15.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: floppy fd_timer_workfn
RIP: 0010:start_motor+0x3a/0x3f0 drivers/block/floppy.c:1905
Code: 08 e8 da 8f 04 fd 48 8b 1d 73 42 e2 0b 48 b8 00 00 00 00 00 fc ff df 0f b6 2d 82 2c e2 0b 48 89 da 48 c1 ea 03 89 e9 41 89 ed <0f> b6 04 02 83 e1 03 41 83 e5 03 84 c0 74 08 3c 03 0f 8e be 02 00
RSP: 0018:ffffc900005cfca8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff847193c6 RDI: ffffffff8471d100
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8471d166 R11: 0000000000000000 R12: ffffffff8471d100
R13: 0000000000000001 R14: ffff888011848400 R15: ffff888010c75800
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31d22000 CR3: 000000004a840000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 floppy_ready+0x7f/0x1930 drivers/block/floppy.c:1932
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
---[ end trace 06cfef375c87e7ff ]---
RIP: 0010:start_motor+0x3a/0x3f0 drivers/block/floppy.c:1905
Code: 08 e8 da 8f 04 fd 48 8b 1d 73 42 e2 0b 48 b8 00 00 00 00 00 fc ff df 0f b6 2d 82 2c e2 0b 48 89 da 48 c1 ea 03 89 e9 41 89 ed <0f> b6 04 02 83 e1 03 41 83 e5 03 84 c0 74 08 3c 03 0f 8e be 02 00
RSP: 0018:ffffc900005cfca8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff847193c6 RDI: ffffffff8471d100
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8471d166 R11: 0000000000000000 R12: ffffffff8471d100
R13: 0000000000000001 R14: ffff888011848400 R15: ffff888010c75800
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555566a2708 CR3: 000000006d54b000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	08 e8                	or     %ch,%al
   2:	da 8f 04 fd 48 8b    	fimull -0x74b702fc(%rdi)
   8:	1d 73 42 e2 0b       	sbb    $0xbe24273,%eax
   d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  14:	fc ff df
  17:	0f b6 2d 82 2c e2 0b 	movzbl 0xbe22c82(%rip),%ebp        # 0xbe22ca0
  1e:	48 89 da             	mov    %rbx,%rdx
  21:	48 c1 ea 03          	shr    $0x3,%rdx
  25:	89 e9                	mov    %ebp,%ecx
  27:	41 89 ed             	mov    %ebp,%r13d
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	83 e1 03             	and    $0x3,%ecx
  31:	41 83 e5 03          	and    $0x3,%r13d
  35:	84 c0                	test   %al,%al
  37:	74 08                	je     0x41
  39:	3c 03                	cmp    $0x3,%al
  3b:	0f                   	.byte 0xf
  3c:	8e                   	.byte 0x8e
  3d:	be                   	.byte 0xbe
  3e:	02 00                	add    (%rax),%al