general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] CPU: 0 PID: 133 Comm: dhcpcd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:dummy_queue+0x1b7/0x870 drivers/usb/gadget/udc/dummy_hcd.c:712 Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 12 50 92 fe 4d 8b 24 24 49 83 c4 48 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:ffffc90000007c50 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff88810bedda10 RCX: dffffc0000000000 RDX: ffff88811a6d4f00 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000007cc8 R08: ffff8881110b8047 R09: ffff8881110b8044 R10: dffffc0000000000 R11: ffffed1022217009 R12: 0000000000000048 R13: ffff88810bedda00 R14: 1ffff110217dbb40 R15: ffff888103facc90 FS: 00007f739cda1740(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557be4b44168 CR3: 000000011a2e7000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usb_ep_queue+0xce/0x210 drivers/usb/gadget/udc/core.c:290 eth_start_xmit+0x811/0xd40 drivers/usb/gadget/function/u_ether.c:588 ncm_tx_timeout+0xec/0x160 drivers/usb/gadget/function/f_ncm.c:1171 __run_hrtimer kernel/time/hrtimer.c:1587 [inline] __hrtimer_run_queues+0x33a/0x7d0 kernel/time/hrtimer.c:1651 hrtimer_run_softirq+0x1ac/0x220 kernel/time/hrtimer.c:1668 __do_softirq+0x255/0x563 kernel/softirq.c:309 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:405 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:102 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x62/0x80 kernel/locking/spinlock.c:191 Code: 48 83 3d d0 8d ca 01 00 74 34 e8 6d f0 c9 fc 66 90 48 89 5d e8 ff 75 e8 9d bf 01 00 00 00 e8 c5 e9 c2 fc 65 8b 05 8a 87 80 7b <85> c0 74 09 48 83 c4 08 5b 41 5e 5d c3 e8 70 87 7e fc eb f0 0f 0b RSP: 0018:ffffc90000cd78e8 EFLAGS: 00000297 RAX: 0000000080000000 RBX: 0000000000000a02 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000a02 RDI: 00000000ffffffff RBP: ffffc90000cd7900 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200019af0c R12: ffffffff86ee3ae8 R13: ffff88810ffbcf08 R14: 0000000000000000 R15: ffff88810ffbcf30 avc_insert security/selinux/avc.c:-1 [inline] avc_compute_av+0x504/0x6b0 security/selinux/avc.c:1020 avc_has_extended_perms+0x98b/0xc90 security/selinux/avc.c:1072 ioctl_has_perm+0x3a6/0x4f0 security/selinux/hooks.c:3676 selinux_file_ioctl+0x3ad/0x4c0 security/selinux/hooks.c:-1 security_file_ioctl+0x74/0xa0 security/security.c:1469 __do_sys_ioctl fs/ioctl.c:747 [inline] __se_sys_ioctl+0x53/0x1a0 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f739cea1378 Code: 00 00 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 07 89 d0 c3 0f 1f 40 00 48 8b 15 49 3a 0d RSP: 002b:00007fff66f2e618 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000557be4bcafe0 RCX: 00007f739cea1378 RDX: 00007fff66f2e620 RSI: 0000000000008921 RDI: 000000000000000f RBP: 00007fff66f2e620 R08: 0000000000000075 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000557be4bdbe60 R13: 0000557bcc07dd8c R14: 0000557bcc079385 R15: 00007fff66f2e8c0 Modules linked in: ---[ end trace d1ab9dad1674f9c3 ]--- RIP: 0010:dummy_queue+0x1b7/0x870 drivers/usb/gadget/udc/dummy_hcd.c:712 Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 12 50 92 fe 4d 8b 24 24 49 83 c4 48 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:ffffc90000007c50 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff88810bedda10 RCX: dffffc0000000000 RDX: ffff88811a6d4f00 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000007cc8 R08: ffff8881110b8047 R09: ffff8881110b8044 R10: dffffc0000000000 R11: ffffed1022217009 R12: 0000000000000048 R13: ffff88810bedda00 R14: 1ffff110217dbb40 R15: ffff888103facc90 FS: 00007f739cda1740(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557be4b44168 CR3: 000000011a2e7000 CR4: 00000000003506b0 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 12 50 92 fe call 0xfe925023 11: 4d 8b 24 24 mov (%r12),%r12 15: 49 83 c4 48 add $0x48,%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