general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 1 PID: 4237 Comm: kworker/1:8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events kfree_rcu_work
RIP: 0010:dummy_queue+0x1a2/0x850 drivers/usb/gadget/udc/dummy_hcd.c:714
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 67 87 87 fb 4d 8b 24 24 49 83 c4 60 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 80 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000dd0b20 EFLAGS: 00010206
RAX: 000000000000000c RBX: ffff88802a54a610 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 1ffff110054a94c0 R08: ffffffff901ee0ff R09: 1ffffffff203dc1f
R10: dffffc0000000000 R11: fffffbfff203dc20 R12: 0000000000000060
R13: ffff88802a54a600 R14: ffff888147a1c0e0 R15: ffff888147a1cc00
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f036ca1c000 CR3: 000000005487e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 usb_ep_queue+0xe6/0x350 drivers/usb/gadget/udc/core.c:288
 eth_start_xmit+0x83d/0xdb0 drivers/usb/gadget/function/u_ether.c:589
 ncm_tx_timeout+0x80/0x90 drivers/usb/gadget/function/f_ncm.c:1170
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4ea/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:memset+0x1e/0x40 mm/kasan/shadow.c:44
Code: 0c 24 ba 01 00 00 00 e9 30 ef ff ff 55 41 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 ba 01 00 00 00 e8 12 ef ff ff <84> c0 74 11 4c 89 f7 89 ee 48 89 da 5b 41 5e 5d e9 0d ad 50 02 31
RSP: 0018:ffffc900031ff560 EFLAGS: 00000256
RAX: 0000000000000001 RBX: 0000000000000010 RCX: ffffffff81351823
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc900031ff6b8
RBP: 0000000000000000 R08: ffffc900031ff6c7 R09: 1ffff9200063fed8
R10: dffffc0000000000 R11: fffff5200063fed9 R12: 1ffffffff1c09702
R13: 1ffffffff1c09702 R14: ffffc900031ff6b8 R15: ffffffff8e04b810
 unwind_next_frame+0x9e3/0x1cf0 arch/x86/kernel/unwind_orc.c:547
 __unwind_start+0x51a/0x650 arch/x86/kernel/unwind_orc.c:704
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 arch_stack_walk+0xda/0x140 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kmem_cache_free_bulk+0x38b/0x490 mm/slub.c:3645
 kfree_bulk include/linux/slab.h:465 [inline]
 kfree_rcu_work+0x311/0x900 kernel/rcu/tree.c:3299
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace d56ae6f1d30dae0b ]---
RIP: 0010:dummy_queue+0x1a2/0x850 drivers/usb/gadget/udc/dummy_hcd.c:714
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 67 87 87 fb 4d 8b 24 24 49 83 c4 60 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 80 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000dd0b20 EFLAGS: 00010206
RAX: 000000000000000c RBX: ffff88802a54a610 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 1ffff110054a94c0 R08: ffffffff901ee0ff R09: 1ffffffff203dc1f
R10: dffffc0000000000 R11: fffffbfff203dc20 R12: 0000000000000060
R13: ffff88802a54a600 R14: ffff888147a1c0e0 R15: ffff888147a1cc00
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f036ca1c000 CR3: 000000005487e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fc                   	cld
   1:	ff                   	lcall  (bad)
   2:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   8:	08 4c 89 e7          	or     %cl,-0x19(%rcx,%rcx,4)
   c:	e8 67 87 87 fb       	call   0xfb878778
  11:	4d 8b 24 24          	mov    (%r12),%r12
  15:	49 83 c4 60          	add    $0x60,%r12
  19:	4c 89 e0             	mov    %r12,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 80 05 00 00    	jne    0x5b6
  36:	45 8b 24 24          	mov    (%r12),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	83 e6 02             	and    $0x2,%esi