------------[ cut here ]------------
WARNING: CPU: 2 PID: 3194 at drivers/block/floppy.c:1000 schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000
Modules linked in:
CPU: 2 PID: 3194 Comm: kworker/u16:1 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: 77 02 fc fc 48 89 2d 80 5e 00 0c 5b 48 c7 c2 40 6a 6a 8c 48 8b 35 51 63 00 0c bf 08 00 00 00 5d e9 86 87 d0 fc e8 51 02 fc fc <0f> 0b eb d1 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 e8 3b 02 fc fc
RSP: 0000:ffffc90000780dd0 EFLAGS: 00010046
RAX: 0000000080010000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88801d282080 RSI: ffffffff847acbbf RDI: 0000000000000003
RBP: ffffffff847af0d0 R08: 0000000000000000 R09: ffffffff8c6a6a47
R10: ffffffff847acb8f R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff847af0d0 R14: 0000000000000000 R15: ffff888010de5000
FS:  0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f635e9511b8 CR3: 0000000068914000 CR4: 0000000000150ee0
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+0x303/0x8f0 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:198 [inline]
 handle_irq_event+0x102/0x280 kernel/irq/handle.c:215
 handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:822
 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 90 2f 7b 90 83 c2 04 ee <e8> 4a fd ff ff 48 83 c4 08 5b 5d e9 ff 0f fc fc e8 fa 0f fc fc 48
RSP: 0000:ffffc900029a7cc0 EFLAGS: 00000202
RAX: 00000000ffffff81 RBX: 0000000000000000 RCX: 1ffffffff20f65f2
RDX: 00000000000003f4 RSI: ffffffff847abd78 RDI: ffffffff907b2f90
RBP: 0000000000000062 R08: 0000000000000001 R09: 0000000000000062
R10: ffffffff847abd69 R11: 0000000000000044 R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff907b2f88 R15: 0000000000000001
 floppy_ready+0x3f7/0x1850 drivers/block/floppy.c:1930
 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298
 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445
 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 90 2f 7b 	mov    -0x6f84d070(,%rdx,8),%rdx
  25:	90
  26:	83 c2 04             	add    $0x4,%edx
  29:	ee                   	out    %al,(%dx)
* 2a:	e8 4a fd ff ff       	callq  0xfffffd79 <-- trapping instruction
  2f:	48 83 c4 08          	add    $0x8,%rsp
  33:	5b                   	pop    %rbx
  34:	5d                   	pop    %rbp
  35:	e9 ff 0f fc fc       	jmpq   0xfcfc1039
  3a:	e8 fa 0f fc fc       	callq  0xfcfc1039
  3f:	48                   	rex.W