general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 1 PID: 8269 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_queue+0x1a7/0x8c0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 82 cd 25 fb 4d 8b 24 24 49 83 c4 50 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 ea 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc900001f05a0 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff88805fb06910 RCX: dffffc0000000000
RDX: ffff88802867bc00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffff88805fb06900 R08: ffffffff911e85c7 R09: 1ffffffff223d0b8
R10: dffffc0000000000 R11: fffffbfff223d0b9 R12: 0000000000000050
R13: 1ffff1100bf60d20 R14: ffff888141fa40e0 R15: ffff888141fa4c00
FS:  0000555589b1c500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18463556b8 CR3: 0000000025e6d000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 usb_ep_queue+0xea/0x350 drivers/usb/gadget/udc/core.c:303
 eth_start_xmit+0xa51/0x1130 drivers/usb/gadget/function/u_ether.c:578
 __netdev_start_xmit include/linux/netdevice.h:4943 [inline]
 netdev_start_xmit include/linux/netdevice.h:4957 [inline]
 xmit_one net/core/dev.c:3644 [inline]
 dev_hard_start_xmit+0x269/0x790 net/core/dev.c:3660
 sch_direct_xmit+0x251/0x4a0 net/sched/sch_generic.c:345
 __dev_xmit_skb net/core/dev.c:3881 [inline]
 __dev_queue_xmit+0x162a/0x3630 net/core/dev.c:4416
 lapb_data_transmit+0x8a/0xa0 net/lapb/lapb_iface.c:447
 lapb_transmit_buffer+0x163/0x200 net/lapb/lapb_out.c:149
 lapb_t1timer_expiry+0x68d/0xaa0 net/lapb/lapb_timer.c:-1
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_switch+0x5b/0xe0 kernel/kcov.c:349
Code: 48 85 c0 0f 84 a4 00 00 00 41 57 41 56 41 54 53 48 8d 4c 09 01 48 8b 54 24 20 65 4c 8b 05 bd 4d 7c 7e 45 31 c9 eb 08 49 ff c1 <4c> 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d ab 4d 7c 7e 41 81 e3 00
RSP: 0018:ffffc90019577210 EFLAGS: 00000203
RAX: 0000000000000002 RBX: ffffffff8f1386d0 RCX: 0000000000000003
RDX: ffffffff813baa28 RSI: ffffffff8cfa05a0 RDI: 0000000000000002
RBP: ffffc90019577358 R08: ffff88802867bc00 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8f1386d5
R13: ffffc90019577308 R14: 0000000000000002 R15: dffffc0000000000
 unwind_next_frame+0x658/0x2990 arch/x86/kernel/unwind_orc.c:505
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
 anon_vma_chain_alloc mm/rmap.c:142 [inline]
 anon_vma_clone+0xb7/0x4c0 mm/rmap.c:289
 anon_vma_fork+0x80/0x520 mm/rmap.c:352
 dup_mmap kernel/fork.c:734 [inline]
 dup_mm kernel/fork.c:1694 [inline]
 copy_mm+0x12c7/0x1e30 kernel/fork.c:1743
 copy_process+0x171d/0x3df0 kernel/fork.c:2508
 kernel_clone+0x24b/0x8a0 kernel/fork.c:2917
 __do_sys_clone kernel/fork.c:3060 [inline]
 __se_sys_clone kernel/fork.c:3044 [inline]
 __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3044
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f18455c6912
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 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 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffff58444b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffff58444b0 RCX: 00007f18455c6912
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffff584463c R08: 0000000000000000 R09: 0000000000000001
R10: 0000555589b1c7d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 0000000000053a5c R15: 00007ffff5844690
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1a7/0x8c0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 82 cd 25 fb 4d 8b 24 24 49 83 c4 50 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 ea 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc900001f05a0 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff88805fb06910 RCX: dffffc0000000000
RDX: ffff88802867bc00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffff88805fb06900 R08: ffffffff911e85c7 R09: 1ffffffff223d0b8
R10: dffffc0000000000 R11: fffffbfff223d0b9 R12: 0000000000000050
R13: 1ffff1100bf60d20 R14: ffff888141fa40e0 R15: ffff888141fa4c00
FS:  0000555589b1c500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18463556b8 CR3: 0000000025e6d000 CR4: 00000000003506e0
----------------
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 82 cd 25 fb       	call   0xfb25cd93
  11:	4d 8b 24 24          	mov    (%r12),%r12
  15:	49 83 c4 50          	add    $0x50,%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 ea 05 00 00    	jne    0x620
  36:	45 8b 24 24          	mov    (%r12),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	83 e6 02             	and    $0x2,%esi