------------[ cut here ]------------
WARNING: CPU: 2 PID: 25814 at drivers/block/floppy.c:1000 schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000
Modules linked in:
CPU: 2 PID: 25814 Comm: kworker/u16:6 Not tainted 5.16.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: floppy floppy_work_workfn
RIP: 0010:schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000
Code: 57 a4 fa fc 48 89 2d 70 8c 02 0c 5b 48 c7 c2 40 38 6b 8c 48 8b 35 41 91 02 0c bf 08 00 00 00 5d e9 86 ef ce fc e8 31 a4 fa fc <0f> 0b eb d1 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 e8 1b a4 fa fc
RSP: 0018:ffffc90000780e40 EFLAGS: 00010046
RAX: 0000000080010000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888025c841c0 RSI: ffffffff847cdd6f RDI: 0000000000000003
RBP: ffffffff847d02c0 R08: 0000000000000000 R09: ffffffff8c6b3847
R10: ffffffff847cdd3f R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff847d02c0 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc0838b23a5 CR3: 0000000022030000 CR4: 0000000000152ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 floppy_interrupt+0x228/0x340 drivers/block/floppy.c:1766
 floppy_hardint+0x1a7/0x200 arch/x86/include/asm/floppy.h:66
 __handle_irq_event_percpu+0x22b/0x880 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210
 handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:820
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250
 common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240
 </IRQ>
 <TASK>
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629
RIP: 0010:outb_p arch/x86/include/asm/io.h:320 [inline]
RIP: 0010:fdc_outb drivers/block/floppy.c:603 [inline]
RIP: 0010:reset_fdc+0x181/0x400 drivers/block/floppy.c:1818
Code: ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 11 00 0f 85 8a 01 00 00 48 8d 14 9b 48 8b 14 d5 30 6f 7f 90 83 c2 04 ee <e8> 0a fd ff ff 48 83 c4 08 5b 5d e9 9f b1 fa fc e8 9a b1 fa fc 48
RSP: 0018:ffffc90002b6fc78 EFLAGS: 00000202
RAX: 00000000ffffff80 RBX: 0000000000000000 RCX: 1ffffffff20fede6
RDX: 00000000000003f4 RSI: ffffffff847ccf68 RDI: ffffffff907f6f30
RBP: 0000000000000062 R08: 0000000000000001 R09: 0000000000000062
R10: ffffffff847ccf59 R11: 0000000000000044 R12: 00000000ffffffff
R13: dffffc0000000000 R14: 0000000000000009 R15: 0000000000000000
 setup_rw_floppy+0x2a3/0x9e0 drivers/block/floppy.c:1525
 seek_floppy drivers/block/floppy.c:1639 [inline]
 floppy_ready drivers/block/floppy.c:1956 [inline]
 floppy_ready+0x345/0x1850 drivers/block/floppy.c:1927
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	ba 00 00 00 00       	mov    $0x0,%edx
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	(bad)
   8:	df 48 89             	fisttps -0x77(%rax)
   b:	f9                   	stc
   c:	48 c1 e9 03          	shr    $0x3,%rcx
  10:	80 3c 11 00          	cmpb   $0x0,(%rcx,%rdx,1)
  14:	0f 85 8a 01 00 00    	jne    0x1a4
  1a:	48 8d 14 9b          	lea    (%rbx,%rbx,4),%rdx
  1e:	48 8b 14 d5 30 6f 7f 	mov    -0x6f8090d0(,%rdx,8),%rdx
  25:	90
  26:	83 c2 04             	add    $0x4,%edx
  29:	ee                   	out    %al,(%dx)
* 2a:	e8 0a fd ff ff       	callq  0xfffffd39 <-- trapping instruction
  2f:	48 83 c4 08          	add    $0x8,%rsp
  33:	5b                   	pop    %rbx
  34:	5d                   	pop    %rbp
  35:	e9 9f b1 fa fc       	jmpq   0xfcfab1d9
  3a:	e8 9a b1 fa fc       	callq  0xfcfab1d9
  3f:	48                   	rex.W