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: 8656 Comm: kworker/u4:6 Not tainted 5.7.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net 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 b8 53 76 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: ffff8882152bcc08 RCX: 1ffffffff186fb46 RDX: 0000000000000066 RSI: ffffffff86fcec28 RDI: 0000000000000330 RBP: ffffffff8d22d7c0 R08: 0000000000000001 R09: fffffbfff185df5e R10: ffffffff8c2efaef R11: fffffbfff185df5d R12: 0000000000000000 R13: 0000000000000104 R14: 0000000000000000 R15: ffff88809a60b800 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000509850 CR3: 000000005dca1000 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:976 rose_loopback_timer+0x15d/0x470 net/rose/rose_loopback.c:100 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers kernel/time/timer.c:1774 [inline] __run_timers kernel/time/timer.c:1741 [inline] run_timer_softirq+0x623/0x1600 kernel/time/timer.c:1787 __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:1140 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:lock_is_held_type+0x270/0x350 kernel/locking/lockdep.c:4976 Code: 03 80 3c 10 00 0f 85 c2 00 00 00 48 83 3d 37 05 3c 08 00 74 32 48 8b 7c 24 10 57 9d 0f 1f 44 00 00 48 83 c4 18 44 89 e0 5b 5d <41> 5c 41 5d 41 5e 41 5f c3 45 31 e4 e9 6e ff ff ff 41 bc 01 00 00 RSP: 0018:ffffc9001743fb38 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff8a586ac8 RDI: 0000000000000282 RBP: 0000000000000000 R08: ffff88805b80a000 R09: fffffbfff14b0d4d R10: ffffffff8a586a67 R11: fffffbfff14b0d4c R12: 0000000000000001 R13: ffff88805b80a940 R14: ffff88805b80a8c0 R15: ffffffff8a586ac8 lock_is_held include/linux/lockdep.h:406 [inline] lockdep_rtnl_is_held+0x17/0x30 net/core/rtnetlink.c:137 sit_destroy_tunnels net/ipv6/sit.c:1826 [inline] sit_exit_batch_net+0x454/0x710 net/ipv6/sit.c:1894 ops_exit_list.isra.0+0x103/0x150 net/core/net_namespace.c:189 cleanup_net+0x511/0xa50 net/core/net_namespace.c:603 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Modules linked in: ---[ end trace 54d1ebae89dee956 ]--- 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 b8 53 76 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: ffff8882152bcc08 RCX: 1ffffffff186fb46 RDX: 0000000000000066 RSI: ffffffff86fcec28 RDI: 0000000000000330 RBP: ffffffff8d22d7c0 R08: 0000000000000001 R09: fffffbfff185df5e R10: ffffffff8c2efaef R11: fffffbfff185df5d R12: 0000000000000000 R13: 0000000000000104 R14: 0000000000000000 R15: ffff88809a60b800 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000509850 CR3: 000000005dca1000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400