general protection fault, probably for non-canonical address 0xdffffc0000000066: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000330-0x0000000000000337] CPU: 0 PID: 6850 Comm: syz-executor.4 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ax25_dev_ax25dev include/net/ax25.h:337 [inline] RIP: 0010:ax25_send_frame+0xe4/0x640 net/ax25/ax25_out.c:56 Code: 00 48 85 c0 49 89 c4 0f 85 fb 03 00 00 e8 14 e6 57 fa 49 8d bd 30 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b1 04 00 00 4d 8b ad 30 03 00 00 4d 85 ed 0f 84 RSP: 0000:ffffc90000007ac0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888214e37c08 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff871c58fc RDI: 0000000000000330 RBP: ffffffff8d537220 R08: 0000000000000001 R09: ffffffff8c5f3b2f R10: fffffbfff18be765 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000001ccb940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558adb772d28 CR3: 0000000062826000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rose_send_frame+0xcc/0x2f0 net/rose/rose_link.c:106 rose_transmit_clear_request+0x1d5/0x290 net/rose/rose_link.c:255 rose_rx_call_request+0x4bd/0x1978 net/rose/af_rose.c:998 rose_loopback_timer+0x15d/0x470 net/rose/rose_loopback.c:100 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x8c/0xe0 kernel/locking/spinlock.c:191 Code: 48 c7 c0 c8 3b b6 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d f3 ef bf 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 95 67 59 f9 65 8b 05 8e b2 0b 78 RSP: 0000:ffffc90005877d58 EFLAGS: 00000286 RAX: 1ffffffff136c779 RBX: 0000000000000286 RCX: 1ffffffff1563fd1 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000286 RBP: ffffffff8cb7a4a0 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8cb7a498 R13: ffffffff89be76c0 R14: ffffc90005877de8 R15: ffffffff8cb7a4a0 debug_object_free lib/debugobjects.c:827 [inline] debug_object_free+0x1c0/0x350 lib/debugobjects.c:800 destroy_hrtimer_on_stack kernel/time/hrtimer.c:457 [inline] hrtimer_nanosleep+0x22b/0x430 kernel/time/hrtimer.c:1951 __do_sys_nanosleep kernel/time/hrtimer.c:1970 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1957 [inline] __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:1957 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ba81 Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 84 cf fb ff c3 48 83 ec 08 e8 ea 46 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 33 47 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffd1871beb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000027e53b RCX: 000000000045ba81 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffd1871bec0 RBP: 00000000000011ae R08: 0000000000000000 R09: 0000000001ccb940 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000014 R13: 00007ffd1871bf10 R14: 000000000027e3b4 R15: 00007ffd1871bf20 Modules linked in: ---[ end trace c60a5096acd114fe ]--- RIP: 0010:ax25_dev_ax25dev include/net/ax25.h:337 [inline] RIP: 0010:ax25_send_frame+0xe4/0x640 net/ax25/ax25_out.c:56 Code: 00 48 85 c0 49 89 c4 0f 85 fb 03 00 00 e8 14 e6 57 fa 49 8d bd 30 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b1 04 00 00 4d 8b ad 30 03 00 00 4d 85 ed 0f 84 RSP: 0000:ffffc90000007ac0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888214e37c08 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff871c58fc RDI: 0000000000000330 RBP: ffffffff8d537220 R08: 0000000000000001 R09: ffffffff8c5f3b2f R10: fffffbfff18be765 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000001ccb940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558adb772d28 CR3: 0000000062826000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400