------------[ cut here ]------------
WARNING: CPU: 2 PID: 2053 at drivers/block/floppy.c:1000 schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000
Modules linked in:
CPU: 2 PID: 2053 Comm: syz-executor.1 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000
Code: 77 7c fc fc 48 89 2d a0 70 00 0c 5b 48 c7 c2 00 42 6a 8c 48 8b 35 71 75 00 0c bf 08 00 00 00 5d e9 a6 fd d0 fc e8 51 7c fc fc <0f> 0b eb d1 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 e8 3b 7c fc fc
RSP: 0018:ffffc90000780c78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000100
RDX: ffff888020e88040 RSI: ffffffff847a681f RDI: 0000000000000003
RBP: ffffffff847a8d30 R08: 0000000000000000 R09: ffffffff8c6a4207
R10: ffffffff847a67ef R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff847a8d30 R14: 0000000000000000 R15: ffff888010de5000
FS:  00005555556fc400(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa8330849c8 CR3: 000000004be8e000 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+0x4d/0xc0 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629
RIP: 0010:__do_softirq+0x196/0x9c2 kernel/softirq.c:544
Code: 00 48 01 f0 48 89 44 24 18 48 c7 c7 c0 8f aa 89 e8 ff 3d c4 ff 65 66 c7 05 75 8f 83 76 00 00 e8 c0 27 fd f7 fb b8 ff ff ff ff <48> c7 c3 c0 a0 80 8b 41 0f bc c5 41 89 c7 41 83 c7 01 75 47 e9 bd
RSP: 0018:ffffc90000780f70 EFLAGS: 00000206
RAX: 00000000ffffffff RBX: ffff888020e88040 RCX: 1ffffffff1b218c9
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffff888011a861c0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817d2988 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000082 R14: 0000000000000000 R15: 0000000000000000
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_release+0x3f1/0x720 kernel/locking/lockdep.c:5645
Code: 7e 83 f8 01 0f 85 8d 01 00 00 9c 58 f6 c4 02 0f 85 78 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90005a8f9e0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: ffffffffffffffff RCX: ffffc90005a8fa30
RDX: 1ffff110041d1152 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff92000b51f3e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff888020e88a98 R15: ffff888020e88040
 rcu_lock_release include/linux/rcupdate.h:273 [inline]
 rcu_read_unlock include/linux/rcupdate.h:721 [inline]
 get_mem_cgroup_from_objcg+0xb7/0x170 mm/memcontrol.c:2806
 obj_cgroup_uncharge_pages+0x9/0x70 mm/memcontrol.c:2980
 __memcg_kmem_uncharge_page+0xf5/0x1b0 mm/memcontrol.c:3058
 memcg_kmem_uncharge_page include/linux/memcontrol.h:1728 [inline]
 free_thread_stack kernel/fork.c:281 [inline]
 release_task_stack kernel/fork.c:431 [inline]
 put_task_stack+0x1b2/0x4e0 kernel/fork.c:442
 copy_process+0x4e05/0x75a0 kernel/fork.c:2471
 kernel_clone+0xe7/0xab0 kernel/fork.c:2582
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2699
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fa83390ef21
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007fff1cb4e6c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fa832862700 RCX: 00007fa83390ef21
RDX: 00007fa8328629d0 RSI: 00007fa8328622f0 RDI: 00000000003d0f00
RBP: 00007fff1cb4e900 R08: 00007fa832862700 R09: 00007fa832862700
R10: 00007fa8328629d0 R11: 0000000000000206 R12: 00007fff1cb4e77e
R13: 00007fff1cb4e77f R14: 00007fa832862300 R15: 00005555556fd940
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 48 01             	add    %cl,0x1(%rax)
   3:	f0 48 89 44 24 18    	lock mov %rax,0x18(%rsp)
   9:	48 c7 c7 c0 8f aa 89 	mov    $0xffffffff89aa8fc0,%rdi
  10:	e8 ff 3d c4 ff       	callq  0xffc43e14
  15:	65 66 c7 05 75 8f 83 	movw   $0x0,%gs:0x76838f75(%rip)        # 0x76838f94
  1c:	76 00 00
  1f:	e8 c0 27 fd f7       	callq  0xf7fd27e4
  24:	fb                   	sti
  25:	b8 ff ff ff ff       	mov    $0xffffffff,%eax
* 2a:	48 c7 c3 c0 a0 80 8b 	mov    $0xffffffff8b80a0c0,%rbx <-- trapping instruction
  31:	41 0f bc c5          	bsf    %r13d,%eax
  35:	41 89 c7             	mov    %eax,%r15d
  38:	41 83 c7 01          	add    $0x1,%r15d
  3c:	75 47                	jne    0x85
  3e:	e9                   	.byte 0xe9
  3f:	bd                   	.byte 0xbd