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: 3688 Comm: ifquery 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 78 1a 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: 0000:ffffc90000007ab8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888215317c08 RCX: 1ffffffff1516a4a RDX: 0000000000000066 RSI: ffffffff87047778 RDI: 0000000000000330 RBP: ffffffff8d25d0c0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8c31db27 R11: fffffbfff1863b64 R12: 0000000000000000 R13: 0000000000000104 R14: 0000000000000000 R15: ffff88804fbb2d00 FS: 00007efd96aea4c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efd96615ba0 CR3: 000000004a537000 CR4: 00000000001406f0 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:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:94 [inline] RIP: 0010:rcu_is_watching+0x87/0xc0 kernel/rcu/tree.c:1080 Code: 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 27 8b 83 d8 00 00 00 d1 e8 83 e0 01 <65> ff 0d 3a 98 a1 7e 74 07 48 83 c4 08 5b 5d c3 e8 e8 ef 9f ff 48 RSP: 0000:ffffc90003467b50 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: ffff8880ae638b40 RCX: ffffffff81608656 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae638c18 RBP: ffff8880ae638c18 R08: ffff88804a792540 R09: ffffed1015cc7184 R10: ffff8880ae638c1b R11: ffffed1015cc7183 R12: ffff8880a759e080 R13: 0000000000000000 R14: ffff8880a759e040 R15: ffff888051272180 rcu_read_unlock include/linux/rcupdate.h:684 [inline] __unlock_page_memcg+0x6d/0xf0 mm/memcontrol.c:2045 alloc_set_pte+0x605/0x1810 mm/memory.c:3674 filemap_map_pages+0x103e/0x12e0 mm/filemap.c:2639 do_fault_around mm/memory.c:3817 [inline] do_read_fault mm/memory.c:3851 [inline] do_fault mm/memory.c:3985 [inline] handle_pte_fault mm/memory.c:4225 [inline] __handle_mm_fault+0x2ab0/0x3aa0 mm/memory.c:4357 handle_mm_fault+0x1a5/0x660 mm/memory.c:4394 do_user_addr_fault arch/x86/mm/fault.c:1301 [inline] do_page_fault+0x56a/0x13d4 arch/x86/mm/fault.c:1390 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203 RIP: 0033:0x7efd96615ba0 Code: 8d 05 24 7f f9 ff 48 89 43 38 b8 03 00 00 00 e9 1a ec ff ff 31 c0 e9 13 ec ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <48> 85 f6 74 44 55 53 48 83 ec 08 48 8b 2e 48 85 ed 74 30 48 89 f3 RSP: 002b:00007fffaafb8048 EFLAGS: 00010283 RAX: ec5a2b9f81fbfd35 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 00007fffaafb8140 RSI: 00007fffaafb8118 RDI: 0000000000000004 RBP: 00007fffaafb8118 R08: 00007fffaafdd2c0 R09: 000000000000000d R10: 000000000000000b R11: 00007fffaafdd1ac R12: 00007fffaafb8140 R13: 00007fffaafb8050 R14: 00007efd96af1170 R15: 0000000000000000 Modules linked in: ---[ end trace 7732605f1c28a66c ]--- 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 78 1a 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: 0000:ffffc90000007ab8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888215317c08 RCX: 1ffffffff1516a4a RDX: 0000000000000066 RSI: ffffffff87047778 RDI: 0000000000000330 RBP: ffffffff8d25d0c0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8c31db27 R11: fffffbfff1863b64 R12: 0000000000000000 R13: 0000000000000104 R14: 0000000000000000 R15: ffff88804fbb2d00 FS: 00007efd96aea4c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efd96615ba0 CR3: 000000004a537000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400