------------[ cut here ]------------
WARNING: CPU: 3 PID: 11 at drivers/block/floppy.c:1000 schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000
Modules linked in:
CPU: 3 PID: 11 Comm: kworker/u16:1 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue:  0x0 (phy6)
RIP: 0010:schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000
Code: 57 1e fd fc 48 89 2d 00 67 ff 0b 5b 48 c7 c2 00 64 6a 8c 48 8b 35 d1 6b ff 0b bf 08 00 00 00 5d e9 96 a5 d1 fc e8 31 1e fd fc <0f> 0b eb d1 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 e8 1b 1e fd fc
RSP: 0018:ffffc900005b8dd0 EFLAGS: 00010046
RAX: 0000000080010001 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88801142ba00 RSI: ffffffff847a79df RDI: 0000000000000003
RBP: ffffffff847b73e0 R08: 0000000000000000 R09: ffffffff8c6a6407
R10: ffffffff847a79af R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff847b73e0 R14: 0000000000000000 R15: ffff888010c75000
FS:  0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000ff801ed8 CR3: 000000004cad1000 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:finish_task_switch.isra.0+0x323/0xb80 kernel/sched/core.c:4852
Code: 83 37 f3 07 85 c0 75 02 0f 0b 48 85 db 0f 85 25 01 00 00 4c 89 f7 e8 fc f7 ff ff e8 d7 44 2d 00 fb 65 48 8b 1c 25 40 70 02 00 <48> 8d bb 80 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc900003cfcb0 EFLAGS: 00000206
RAX: 0000000000400139 RBX: ffff88801142ba00 RCX: 1ffffffff1b21f11
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900003cfcf8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817ddbf8 R11: 0000000000000001 R12: ffff88802cd3a7d8
R13: ffff88801a6f8000 R14: ffff88802cd39a80 R15: ffff88802cd3a4b8
 context_switch kernel/sched/core.c:4975 [inline]
 __schedule+0xaa2/0x4940 kernel/sched/core.c:6253
 schedule+0xd2/0x260 kernel/sched/core.c:6326
 worker_thread+0x15c/0x11f0 kernel/workqueue.c:2466
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	f3 07                	repz (bad)
   2:	85 c0                	test   %eax,%eax
   4:	75 02                	jne    0x8
   6:	0f 0b                	ud2
   8:	48 85 db             	test   %rbx,%rbx
   b:	0f 85 25 01 00 00    	jne    0x136
  11:	4c 89 f7             	mov    %r14,%rdi
  14:	e8 fc f7 ff ff       	callq  0xfffff815
  19:	e8 d7 44 2d 00       	callq  0x2d44f5
  1e:	fb                   	sti
  1f:	65 48 8b 1c 25 40 70 	mov    %gs:0x27040,%rbx
  26:	02 00
* 28:	48 8d bb 80 15 00 00 	lea    0x1580(%rbx),%rdi <-- trapping instruction
  2f:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  36:	fc ff df
  39:	48 89 fa             	mov    %rdi,%rdx
  3c:	48                   	rex.W
  3d:	c1                   	.byte 0xc1