general protection fault, probably for non-canonical address 0xdffffc0000000069: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000348-0x000000000000034f] CPU: 0 PID: 2700 Comm: kworker/0:5 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker RIP: 0010:rose_send_frame+0x1dd/0x2f0 net/rose/rose_link.c:101 Code: 48 c1 ea 03 80 3c 02 00 0f 85 06 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 8d bd 48 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 00 00 00 4c 8b bd 48 03 00 00 e9 77 fe ff ff RSP: 0018:ffffc90000007b20 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888215263000 RCX: ffffffff86e5f6f3 RDX: 0000000000000069 RSI: ffffffff86e5f862 RDI: 0000000000000348 RBP: 0000000000000000 R08: ffff8880a07185c0 R09: ffffed10145d8e1d R10: ffffed10145d8e1c R11: ffff8880a2ec70e3 R12: ffff888215263000 R13: 0000000000000078 R14: ffff888097de9940 R15: 0000000000000010 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000c82672 CR3: 000000009ed86000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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+0x195/0x760 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/0x99d 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:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 kernel/kcov.c:187 Code: 0f 1f 84 00 00 00 00 00 65 48 8b 04 25 c0 1e 02 00 65 8b 15 68 ff 8f 7e 81 e2 00 01 1f 00 48 8b 34 24 75 2b 8b 90 80 13 00 00 <83> fa 02 75 20 48 8b 88 88 13 00 00 8b 80 84 13 00 00 48 8b 11 48 RSP: 0018:ffffc90007dffc58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a07185c0 RBX: 0000000000000001 RCX: ffffffff864a3237 RDX: 0000000000000000 RSI: ffffffff864a3241 RDI: 0000000000000005 RBP: ffff88809a347f98 R08: ffff8880a07185c0 R09: fffffbfff180f775 R10: fffffbfff180f774 R11: ffffffff8c07bba7 R12: 0000000000010000 R13: fffffbfff12e7697 R14: 0000000000000200 R15: dffffc0000000000 rcu_read_lock include/linux/rcupdate.h:602 [inline] gc_worker+0x1a1/0xd40 net/netfilter/nf_conntrack_core.c:1381 process_one_work+0x94b/0x1690 kernel/workqueue.c:2266 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace 35cf0c09ebc5ca3e ]--- RIP: 0010:rose_send_frame+0x1dd/0x2f0 net/rose/rose_link.c:101 Code: 48 c1 ea 03 80 3c 02 00 0f 85 06 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 8d bd 48 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 00 00 00 4c 8b bd 48 03 00 00 e9 77 fe ff ff RSP: 0018:ffffc90000007b20 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888215263000 RCX: ffffffff86e5f6f3 RDX: 0000000000000069 RSI: ffffffff86e5f862 RDI: 0000000000000348 RBP: 0000000000000000 R08: ffff8880a07185c0 R09: ffffed10145d8e1d R10: ffffed10145d8e1c R11: ffff8880a2ec70e3 R12: ffff888215263000 R13: 0000000000000078 R14: ffff888097de9940 R15: 0000000000000010 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000c82672 CR3: 000000009ed86000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400