------------[ cut here ]------------
WARNING: CPU: 2 PID: 11 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline]
WARNING: CPU: 2 PID: 11 at drivers/block/floppy.c:999 floppy_interrupt+0x3cc/0x440 drivers/block/floppy.c:1765
Modules linked in:
CPU: 2 PID: 11 Comm: kworker/u16:1 Not tainted 6.3.0-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 drivers/block/floppy.c:999 [inline]
RIP: 0010:floppy_interrupt+0x3cc/0x440 drivers/block/floppy.c:1765
Code: e3 ce 8a 89 c6 89 05 43 d8 ec 0c e8 7e 27 ff ff 8b 1d 38 d8 ec 0c e9 9c fd ff ff e8 6e 79 b6 fc e9 66 fd ff ff e8 14 4d 66 fc <0f> 0b e9 c9 fe ff ff 48 c7 c7 00 f2 40 8c e8 11 79 b6 fc e9 5a fc
RSP: 0018:ffffc90000790e58 EFLAGS: 00010046
RAX: 0000000080010000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8880140be000 RSI: ffffffff851bc41c RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff851b3dc0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000006
FS: 0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff3f983138 CR3: 000000004cf73000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
floppy_hardint+0x1b1/0x200 arch/x86/include/asm/floppy.h:66
__handle_irq_event_percpu+0x22b/0x730 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x263/0xd00 kernel/irq/chip.c:819
generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
handle_irq arch/x86/kernel/irq.c:231 [inline]
__common_interrupt+0xa1/0x220 arch/x86/kernel/irq.c:250
common_interrupt+0xa8/0xd0 arch/x86/kernel/irq.c:240
</IRQ>
<TASK>
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
RIP: 0010:outb_p arch/x86/include/asm/io.h:296 [inline]
RIP: 0010:fdc_outb drivers/block/floppy.c:602 [inline]
RIP: 0010:reset_fdc+0x185/0x400 drivers/block/floppy.c:1817
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 73 08 92 83 c2 04 ee <e8> 56 ec ff ff 48 83 c4 08 5b 5d e9 9b 05 67 fc e8 96 05 67 fc 48
RSP: 0018:ffffc900005efcf8 EFLAGS: 00000202
RAX: 00000000ffffff83 RBX: 0000000000000000 RCX: 1ffffffff2410e66
RDX: 00000000000003f4 RSI: ffffffff851b0afc RDI: ffffffff92087330
RBP: 0000000000000062 R08: 0000000000000001 R09: 0000000000000044
R10: 0000000000000062 R11: 0000000000000000 R12: ffffc900005efda8
R13: ffffffff8d44d530 R14: ffff888014035400 R15: ffff888012479000
process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
worker_thread+0x669/0x1090 kernel/workqueue.c:2537
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</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 73 08 mov -0x6df78cd0(,%rdx,8),%rdx
25: 92
26: 83 c2 04 add $0x4,%edx
29: ee out %al,(%dx)
* 2a: e8 56 ec ff ff callq 0xffffec85 <-- trapping instruction
2f: 48 83 c4 08 add $0x8,%rsp
33: 5b pop %rbx
34: 5d pop %rbp
35: e9 9b 05 67 fc jmpq 0xfc6705d5
3a: e8 96 05 67 fc callq 0xfc6705d5
3f: 48 rex.W