Oops: general protection fault, probably for non-canonical address 0xdffffc00000000e6: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000730-0x0000000000000737]
CPU: 0 UID: 0 PID: 13823 Comm: syz.0.2298 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:f_midi2_free_ep_reqs+0x56/0x2b0 drivers/usb/gadget/function/f_midi2.c:1166
Code: 85 6a 02 00 00 49 8b 45 00 48 89 44 24 18 48 05 30 07 00 00 48 89 c2 48 89 44 24 20 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 01 00 00 48 8b 44 24 18 31
RSP: 0000:ffffc9000387f918 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff88805a668000 RCX: ffffffff87e556f9
RDX: 00000000000000e6 RSI: ffffffff87e55536 RDI: ffff88805a668128
RBP: ffff88805a668128 R08: 0000000000000004 R09: 0000000000000020
R10: 0000000000000020 R11: 0000000000000000 R12: ffff88805a6680f0
R13: ffff88805a668128 R14: ffff88805a668740 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888096bdf000(0063) knlGS:00000000582c1480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f53f3ff4 CR3: 0000000052960000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 f_midi2_stop_eps drivers/usb/gadget/function/f_midi2.c:1246 [inline]
 f_midi2_set_alt+0x444/0x5f0 drivers/usb/gadget/function/f_midi2.c:1296
 composite_setup+0x16f8/0x9290 drivers/usb/gadget/composite.c:1933
 configfs_composite_setup+0xfb/0x130 drivers/usb/gadget/configfs.c:1877
 dummy_timer+0x2045/0x36f0 drivers/usb/gadget/udc/dummy_hcd.c:1951
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
 hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2113
 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x56/0xc0 arch/x86/kernel/apic/apic.c:1062
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0023:0xf7060560
Code: 8b 7c 24 04 8b 4c 24 08 8b 5c 24 0c 81 e6 ff 1f 00 00 89 4c f5 00 89 5c f5 04 88 04 37 31 c0 83 c4 24 5b 5e 5f 5d c3 8d 76 00 <8b> 7c 24 04 8b 44 24 18 38 04 17 74 15 88 04 17 8b 44 24 08 89 44
RSP: 002b:00000000ffe9b878 EFLAGS: 00000246
RAX: 00000000824ba795 RBX: 0000000000000000 RCX: 00000000824ba795
RDX: 0000000000000795 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000f7422000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f_midi2_free_ep_reqs+0x56/0x2b0 drivers/usb/gadget/function/f_midi2.c:1166
Code: 85 6a 02 00 00 49 8b 45 00 48 89 44 24 18 48 05 30 07 00 00 48 89 c2 48 89 44 24 20 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 01 00 00 48 8b 44 24 18 31
RSP: 0000:ffffc9000387f918 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff88805a668000 RCX: ffffffff87e556f9
RDX: 00000000000000e6 RSI: ffffffff87e55536 RDI: ffff88805a668128
RBP: ffff88805a668128 R08: 0000000000000004 R09: 0000000000000020
R10: 0000000000000020 R11: 0000000000000000 R12: ffff88805a6680f0
R13: ffff88805a668128 R14: ffff88805a668740 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888096bdf000(0063) knlGS:00000000582c1480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f53f3ff4 CR3: 0000000052960000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	85 6a 02             	test   %ebp,0x2(%rdx)
   3:	00 00                	add    %al,(%rax)
   5:	49 8b 45 00          	mov    0x0(%r13),%rax
   9:	48 89 44 24 18       	mov    %rax,0x18(%rsp)
   e:	48 05 30 07 00 00    	add    $0x730,%rax
  14:	48 89 c2             	mov    %rax,%rdx
  17:	48 89 44 24 20       	mov    %rax,0x20(%rsp)
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e b5 01 00 00    	jle    0x1ef
  3a:	48 8b 44 24 18       	mov    0x18(%rsp),%rax
  3f:	31                   	.byte 0x31