------------[ cut here ]------------
WARNING: CPU: 2 PID: 9036 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline]
WARNING: CPU: 2 PID: 9036 at drivers/block/floppy.c:999 floppy_interrupt+0x415/0x480 drivers/block/floppy.c:1765
Modules linked in:
CPU: 2 PID: 9036 Comm: syz-executor.1 Not tainted 6.6.0-rc4-syzkaller-00031-gba7d997a2a29 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:schedule_bh drivers/block/floppy.c:999 [inline]
RIP: 0010:floppy_interrupt+0x415/0x480 drivers/block/floppy.c:1765
Code: ff 89 de e8 1d 7a 49 fc 85 db 0f 85 75 ff ff ff 41 be 01 00 00 00 e9 64 fd ff ff e8 15 71 9e fc e9 1d fd ff ff e8 8b 7e 49 fc <0f> 0b e9 2d fe ff ff 48 c7 c7 00 f2 80 8c e8 b8 70 9e fc e9 11 fc
RSP: 0018:ffffc90000a48e60 EFLAGS: 00010046
RAX: 0000000080010002 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88811e6d5380 RSI: ffffffff853d4685 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffc90000a48ff8 R12: ffffffff853cded0
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
FS:  000055555596f480(0000) GS:ffff88806b800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4e498c56be CR3: 0000000125f80000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 floppy_hardint+0x1aa/0x200 arch/x86/include/asm/floppy.h:66
 __handle_irq_event_percpu+0x22a/0x740 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+0x261/0xcf0 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
 handle_irq arch/x86/kernel/irq.c:238 [inline]
 __common_interrupt+0xdb/0x240 arch/x86/kernel/irq.c:257
 common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5721
Code: c1 05 55 f9 9a 7e 83 f8 01 0f 85 b0 02 00 00 9c 58 f6 c4 02 0f 85 9b 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc900222bf4e8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92004457e9f RCX: 0000000000000001
RDX: 1ffff11023cdabc8 RSI: ffffffff8a8c9ea0 RDI: ffffffff8ae911e0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff233cdd0
R10: ffffffff919e6e87 R11: dffffc0000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8cba7920 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 rcu_read_lock include/linux/rcupdate.h:749 [inline]
 page_ext_get+0x3a/0x310 mm/page_ext.c:508
 page_table_check_set mm/page_table_check.c:109 [inline]
 page_table_check_set+0x1b5/0x9a0 mm/page_table_check.c:97
 __page_table_check_ptes_set+0x1cc/0x220 mm/page_table_check.c:196
 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
 set_ptes include/linux/pgtable.h:234 [inline]
 copy_present_pte mm/memory.c:978 [inline]
 copy_pte_range mm/memory.c:1082 [inline]
 copy_pmd_range mm/memory.c:1167 [inline]
 copy_pud_range mm/memory.c:1204 [inline]
 copy_p4d_range mm/memory.c:1228 [inline]
 copy_page_range+0x1512/0x3d50 mm/memory.c:1326
 dup_mmap+0x13f3/0x1d80 kernel/fork.c:758
 dup_mm kernel/fork.c:1686 [inline]
 copy_mm kernel/fork.c:1735 [inline]
 copy_process+0x6bff/0x73f0 kernel/fork.c:2501
 kernel_clone+0xfd/0x920 kernel/fork.c:2909
 __do_sys_clone+0xba/0x100 kernel/fork.c:3052
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4e48c79b13
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007fff53eb34b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4e48c79b13
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055555596f750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
----------------
Code disassembly (best guess):
   0:	c1 05 55 f9 9a 7e 83 	roll   $0x83,0x7e9af955(%rip)        # 0x7e9af95c
   7:	f8                   	clc
   8:	01 0f                	add    %ecx,(%rdi)
   a:	85 b0 02 00 00 9c    	test   %esi,-0x63fffffe(%rax)
  10:	58                   	pop    %rax
  11:	f6 c4 02             	test   $0x2,%ah
  14:	0f 85 9b 02 00 00    	jne    0x2b5
  1a:	48 85 ed             	test   %rbp,%rbp
  1d:	74 01                	je     0x20
  1f:	fb                   	sti
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	48 01 c3             	add    %rax,%rbx <-- trapping instruction
  2d:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
  34:	48 c7 43 08 00 00 00 	movq   $0x0,0x8(%rbx)
  3b:	00
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	84                   	.byte 0x84
  3f:	24                   	.byte 0x24