general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] CPU: 1 PID: 302 Comm: udevd Tainted: G W 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 f2 4e 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:ffffc90000170c50 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff8881083fda10 RCX: dffffc0000000000 RDX: ffff888126b1a780 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000170cc8 R08: ffff888121928173 R09: ffff888121928170 R10: dffffc0000000000 R11: ffffed102432502f R12: 0000000000000048 R13: ffff8881083fda00 R14: 1ffff1102107fb40 R15: ffff888103fbcc90 FS: 00007f6d787b9880(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2b69a6 CR3: 000000010cd6d000 CR4: 00000000003526a0 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:bytes_is_nonzero mm/kasan/generic.c:85 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x89/0x2a0 mm/kasan/generic.c:189 Code: 49 c1 e9 03 4b 8d 1c 29 49 89 dc 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 45 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 41 80 3b 00 <0f> 85 95 01 00 00 49 ff c3 48 ff c3 75 ee e9 25 01 00 00 45 89 df RSP: 0018:ffffc900079978f8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff81aa9c9d RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90007997c20 RBP: ffffc90007997920 R08: ffffc90007997c2f R09: 1ffff92000f32f85 R10: dffffc0000000000 R11: fffff52000f32f85 R12: 0000000000000002 R13: dffffc0000000001 R14: 1ffff92000f32f84 R15: ffffc90007997c20 memset+0x23/0x40 mm/kasan/shadow.c:44 terminate_walk+0x40d/0x4f0 fs/namei.c:610 path_openat+0x27d0/0x3040 fs/namei.c:3518 do_filp_open+0x1df/0x400 fs/namei.c:3544 do_sys_openat2+0x19f/0x750 fs/open.c:1219 do_sys_open fs/open.c:1235 [inline] __do_sys_openat fs/open.c:1251 [inline] __se_sys_openat fs/open.c:1246 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1246 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f6d788a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007fff2b936ed0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f6d787b9880 RCX: 00007f6d788a7407 RDX: 0000000000080000 RSI: 00007fff2b937050 RDI: ffffffffffffff9c RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 000055a39d5417f5 R13: 000055a39d5417f5 R14: 0000000000000001 R15: 0000000000000000 Modules linked in: ---[ end trace 15a335b0d9042462 ]--- 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 f2 4e 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:ffffc90000170c50 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff8881083fda10 RCX: dffffc0000000000 RDX: ffff888126b1a780 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000170cc8 R08: ffff888121928173 R09: ffff888121928170 R10: dffffc0000000000 R11: ffffed102432502f R12: 0000000000000048 R13: ffff8881083fda00 R14: 1ffff1102107fb40 R15: ffff888103fbcc90 FS: 00007f6d787b9880(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2b69a6 CR3: 000000010cd6d000 CR4: 00000000003526a0 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 f2 4e 92 fe call 0xfe924f03 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