general protection fault, probably for non-canonical address 0xdffffc0000000066: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000330-0x0000000000000337] CPU: 1 PID: 27955 Comm: syz-executor.5 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ax25_send_frame+0xe1/0x660 net/ax25/ax25_out.c:56 Code: c6 00 00 48 85 c0 0f 85 0c 04 00 00 e8 e8 1c 6f fa 49 8d bc 24 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 d2 04 00 00 49 8b 84 24 30 03 00 00 48 85 c0 48 RSP: 0018:ffffc90000da8ab8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880a7dbc408 RCX: 1ffffffff1516a22 RDX: 0000000000000066 RSI: ffffffff87047508 RDI: 0000000000000330 RBP: ffffffff8d25d100 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8c31db67 R11: fffffbfff1863b6c R12: 0000000000000000 R13: 0000000000000104 R14: 0000000000000000 R15: ffff88809a091a40 FS: 00007f0249d4e700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000043e2a0 CR3: 000000006c165000 CR4: 00000000001406e0 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+0x1de/0x290 net/rose/rose_link.c:255 rose_rx_call_request+0x488/0x1960 net/rose/af_rose.c:996 rose_loopback_timer+0x15d/0x470 net/rose/rose_loopback.c:100 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x623/0x1600 kernel/time/timer.c:1786 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x192/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1107 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [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 c0 b1 94 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d 0b ed b7 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 45 8b 72 f9 65 8b 05 f6 59 25 78 RSP: 0018:ffffc90005457550 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1329638 RBX: 0000000000000282 RCX: 1ffffffff1516a22 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffffffff8c95f5a0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880484eb000 R13: ffffffff8c95f5a0 R14: 0000000000000000 R15: 0000000000000000 __debug_check_no_obj_freed lib/debugobjects.c:977 [inline] debug_check_no_obj_freed+0x213/0x449 lib/debugobjects.c:998 free_pages_prepare mm/page_alloc.c:1220 [inline] __free_pages_ok+0x252/0xe90 mm/page_alloc.c:1472 release_pages+0x61b/0x19b0 mm/swap.c:873 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0x8d/0x610 mm/mmu_gather.c:249 zap_pte_range mm/memory.c:1156 [inline] zap_pmd_range mm/memory.c:1194 [inline] zap_pud_range mm/memory.c:1223 [inline] zap_p4d_range mm/memory.c:1244 [inline] unmap_page_range+0x18ec/0x2470 mm/memory.c:1265 unmap_single_vma+0x196/0x300 mm/memory.c:1310 unmap_vmas+0x16f/0x2f0 mm/memory.c:1342 exit_mmap+0x2aa/0x510 mm/mmap.c:3150 __mmput kernel/fork.c:1094 [inline] mmput+0x168/0x4b0 kernel/fork.c:1115 exit_mm kernel/exit.c:483 [inline] do_exit+0xa5c/0x2de0 kernel/exit.c:793 do_group_exit+0x125/0x340 kernel/exit.c:904 get_signal+0x47b/0x24e0 kernel/signal.c:2739 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:810 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca69 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0249d4dcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000078bf08 RCX: 000000000045ca69 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000078bf0c RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000042e R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffd751b9a6f R14: 00007f0249d4e9c0 R15: 000000000078bf0c Modules linked in: ---[ end trace 5794e6144933f2e6 ]--- RIP: 0010:ax25_send_frame+0xe1/0x660 net/ax25/ax25_out.c:56 Code: c6 00 00 48 85 c0 0f 85 0c 04 00 00 e8 e8 1c 6f fa 49 8d bc 24 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 d2 04 00 00 49 8b 84 24 30 03 00 00 48 85 c0 48 RSP: 0018:ffffc90000da8ab8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880a7dbc408 RCX: 1ffffffff1516a22 RDX: 0000000000000066 RSI: ffffffff87047508 RDI: 0000000000000330 RBP: ffffffff8d25d100 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8c31db67 R11: fffffbfff1863b6c R12: 0000000000000000 R13: 0000000000000104 R14: 0000000000000000 R15: ffff88809a091a40 FS: 00007f0249d4e700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000043e2a0 CR3: 000000006c165000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400