general protection fault, probably for non-canonical address 0xdffffc000000006c: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000360-0x0000000000000367] CPU: 1 PID: 4713 Comm: kworker/1:11 Not tainted 6.0.0-rc4-syzkaller-00916-g169ccf0e4082 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Workqueue: events linkwatch_event RIP: 0010:ax25_dev_ax25dev include/net/ax25.h:342 [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 d4 91 2b f9 49 8d bd 60 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 60 03 00 00 4d 85 ed 0f 84 RSP: 0018:ffffc900001e0ab8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88814b05bc08 RCX: 0000000000000100 RDX: 000000000000006c RSI: ffffffff8850763c RDI: 0000000000000360 RBP: ffffffff91562f20 R08: 0000000000000001 R09: ffffffff908e6aa7 R10: 0000000000000001 R11: 1ffffffff202629e R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e825000 CR3: 000000004db66000 CR4: 00000000003506e0 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+0x4c0/0x1bc0 net/rose/af_rose.c:1009 rose_loopback_timer+0x19e/0x590 net/rose/rose_loopback.c:111 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200 Code: 48 89 ef 5d e9 21 16 4c 00 5d be 03 00 00 00 e9 e6 be 81 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 29 67 86 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b RSP: 0018:ffffc9001584f720 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888046e19d80 RSI: ffffffff8161b1e5 RDI: 0000000000000007 RBP: ffffc9001584f8c8 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff91175da0 R14: 0000000000000200 R15: ffffffff8ca2f8f8 console_emit_next_record.constprop.0+0x4fb/0x840 arch/x86/include/asm/irqflags.h:45 console_flush_all kernel/printk/printk.c:2794 [inline] console_unlock+0x37a/0x5a0 kernel/printk/printk.c:2861 vprintk_emit+0x1b9/0x5f0 kernel/printk/printk.c:2271 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50 _printk+0xba/0xed kernel/printk/printk.c:2292 addrconf_notify.cold+0x26/0x68 net/ipv6/addrconf.c:3612 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 netdev_state_change net/core/dev.c:1334 [inline] netdev_state_change+0x100/0x130 net/core/dev.c:1327 linkwatch_do_dev+0x10e/0x150 net/core/link_watch.c:168 __linkwatch_run_queue+0x23f/0x6a0 net/core/link_watch.c:221 linkwatch_event+0x4a/0x60 net/core/link_watch.c:264 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ax25_dev_ax25dev include/net/ax25.h:342 [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 d4 91 2b f9 49 8d bd 60 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 60 03 00 00 4d 85 ed 0f 84 RSP: 0018:ffffc900001e0ab8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88814b05bc08 RCX: 0000000000000100 RDX: 000000000000006c RSI: ffffffff8850763c RDI: 0000000000000360 RBP: ffffffff91562f20 R08: 0000000000000001 R09: ffffffff908e6aa7 R10: 0000000000000001 R11: 1ffffffff202629e R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e825000 CR3: 000000004db66000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 48 85 add %cl,-0x7b(%rax) 3: c0 49 89 c4 rorb $0xc4,-0x77(%rcx) 7: 0f 85 fb 03 00 00 jne 0x408 d: e8 d4 91 2b f9 callq 0xf92b91e6 12: 49 8d bd 60 03 00 00 lea 0x360(%r13),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 b1 04 00 00 jne 0x4e5 34: 4d 8b ad 60 03 00 00 mov 0x360(%r13),%r13 3b: 4d 85 ed test %r13,%r13 3e: 0f .byte 0xf 3f: 84 .byte 0x84