general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 0 PID: 5084 Comm: syz.3.174 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:dummy_queue+0x1a3/0x8c0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 66 85 53 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:ffffc90000007b18 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff8880783c7210 RCX: dffffc0000000000
RDX: ffff88802c4a9e00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffff8880783c7200 R08: ffffffff90b102ef R09: 1ffffffff216205d
R10: dffffc0000000000 R11: fffffbfff216205e R12: 0000000000000050
R13: 1ffff1100f078e40 R14: ffff888144bb40e0 R15: ffff888144bb4c00
FS: 00007f2e76fd96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000002b4030 CR3: 0000000077a9a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
usb_ep_queue+0xde/0x3d0 drivers/usb/gadget/udc/core.c:305
eth_start_xmit+0x8b2/0xe70 drivers/usb/gadget/function/u_ether.c:590
ncm_tx_timeout+0x80/0x90 drivers/usb/gadget/function/f_ncm.c:1166
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
handle_softirqs+0x291/0x910 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 3f 89 1e f7 65 8b 05 b0 3a c8 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000d65f5e0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 36429831d5c2a500
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: 0000000000000001
RBP: ffffc9000d65f678 R08: ffffffff90b102ef R09: 1ffffffff216205d
R10: dffffc0000000000 R11: fffffbfff216205e R12: dffffc0000000000
R13: ffff88807c8679d0 R14: ffff88807c8679d0 R15: 1ffff92001acbebc
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__skb_try_recv_datagram+0x17d/0x4e0 net/core/datagram.c:265
__unix_dgram_recvmsg+0x2f5/0xd90 net/unix/af_unix.c:2451
____sys_recvmsg+0x2c8/0x5b0 net/socket.c:-1
___sys_recvmsg+0x210/0x590 net/socket.c:2780
do_recvmmsg+0x370/0x810 net/socket.c:2874
__sys_recvmmsg net/socket.c:2953 [inline]
__do_sys_recvmmsg net/socket.c:2976 [inline]
__se_sys_recvmmsg net/socket.c:2969 [inline]
__x64_sys_recvmmsg+0x195/0x250 net/socket.c:2969
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2e7619e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2e76fd9028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f2e76426090 RCX: 00007f2e7619e0d9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f2e76235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2e76426128 R14: 00007f2e76426090 R15: 00007ffeffcc6578
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1a3/0x8c0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 66 85 53 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:ffffc90000007b18 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff8880783c7210 RCX: dffffc0000000000
RDX: ffff88802c4a9e00 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffff8880783c7200 R08: ffffffff90b102ef R09: 1ffffffff216205d
R10: dffffc0000000000 R11: fffffbfff216205e R12: 0000000000000050
R13: 1ffff1100f078e40 R14: ffff888144bb40e0 R15: ffff888144bb4c00
FS: 00007f2e76fd96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000002b4030 CR3: 0000000077a9a000 CR4: 00000000003506f0
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 66 85 53 fb call 0xfb538577
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