------------[ cut here ]------------ WARNING: CPU: 3 PID: 9219 at drivers/block/floppy.c:999 schedule_bh+0x5f/0x70 drivers/block/floppy.c:999 Modules linked in: CPU: 3 PID: 9219 Comm: kworker/u16:3 Not tainted 5.14.0-rc1-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:999 Code: 97 d5 09 fd 48 89 2d 80 c8 e3 0b 5b 48 c7 c2 20 25 47 8c 48 8b 35 51 cd e3 0b bf 08 00 00 00 5d e9 66 de df fc e8 71 d5 09 fd <0f> 0b eb d1 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 e8 5b d5 09 fd RSP: 0018:ffffc900005b8dd0 EFLAGS: 00010046 RAX: 0000000080010000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff888076a0d4c0 RSI: ffffffff846bb35f RDI: 0000000000000003 RBP: ffffffff846baf90 R08: 0000000000000000 R09: ffffffff8c472527 R10: ffffffff846bb32f R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff846baf90 R14: 0000000000000000 R15: ffff888010875000 FS: 0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f96df6acfe3 CR3: 000000004850a000 CR4: 0000000000152ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: floppy_interrupt+0x228/0x340 drivers/block/floppy.c:1765 floppy_hardint+0x256/0x320 arch/x86/include/asm/floppy.h:66 __handle_irq_event_percpu+0x303/0x8f0 kernel/irq/handle.c:156 handle_irq_event_percpu kernel/irq/handle.c:196 [inline] handle_irq_event+0x102/0x280 kernel/irq/handle.c:213 handle_edge_irq+0x25f/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+0x9d/0x210 arch/x86/kernel/irq.c:250 common_interrupt+0x9f/0xd0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629 RIP: 0010:slow_down_io arch/x86/include/asm/paravirt.h:55 [inline] RIP: 0010:outb_p arch/x86/include/asm/io.h:334 [inline] RIP: 0010:fdc_outb drivers/block/floppy.c:602 [inline] RIP: 0010:output_byte+0x9b/0x3c0 drivers/block/floppy.c:1142 Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 c2 02 00 00 48 8d 04 9b 48 8b 14 c5 30 81 4f 90 44 89 e8 83 c2 05 ee <48> c7 c3 a0 20 7f 8b 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 RSP: 0018:ffffc90001417c30 EFLAGS: 00000206 RAX: 00000000fffffff6 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 00000000000003f5 RSI: ffffffff846be1b4 RDI: ffffffff904f8130 RBP: 0000000000000000 R08: 0000000000000080 R09: 0000000000000390 R10: ffffffff846be1a6 R11: 0000000000000000 R12: 0000000000000090 R13: 00000000fffffff6 R14: 0000000000000005 R15: 0000000000000008 setup_rw_floppy+0x16a/0x9e0 drivers/block/floppy.c:1518 seek_floppy drivers/block/floppy.c:1638 [inline] floppy_ready drivers/block/floppy.c:1955 [inline] floppy_ready+0x3d5/0x1930 drivers/block/floppy.c:1926 redo_format+0x541/0x680 drivers/block/floppy.c:2214 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295