general protection fault, probably for non-canonical address 0xdffffc000000006a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000350-0x0000000000000357]
CPU: 1 PID: 17214 Comm: kworker/1:12 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events iterate_cleanup_work
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 50 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 00 00 00 4c 8b bd 50 03 00 00 e9 77 fe ff ff
RSP: 0018:ffffc90000da8b18 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8880997e6800 RCX: ffffffff87127bf3
RDX: 000000000000006a RSI: ffffffff87127d62 RDI: 0000000000000350
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff8880649aace3
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880997e6800
R13: 0000000000000078 R14: ffff8880525d3500 R15: 0000000000000010
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005649f55d8000 CR3: 00000000a37a5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rose_transmit_clear_request+0x1d5/0x290 net/rose/rose_link.c:255
 rose_rx_call_request+0x4bd/0x1978 net/rose/af_rose.c:998
 rose_loopback_timer+0x15d/0x470 net/rose/rose_loopback.c:100
 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1415
 expire_timers kernel/time/timer.c:1460 [inline]
 __run_timers.part.0+0x54c/0xa20 kernel/time/timer.c:1784
 __run_timers kernel/time/timer.c:1756 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1797
 __do_softirq+0x34c/0xa60 kernel/softirq.c:292
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:387 [inline]
 __irq_exit_rcu kernel/softirq.c:417 [inline]
 irq_exit_rcu+0x229/0x270 kernel/softirq.c:429
 sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:102 [inline]
RIP: 0010:__local_bh_enable_ip+0x189/0x250 kernel/softirq.c:196
Code: 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 c4 00 00 00 48 83 3d 38 5a 6e 08 00 74 7b fb 66 0f 1f 44 00 00 <65> 8b 05 50 78 bb 7e 85 c0 74 6b 5b 5d 41 5c c3 80 3d e2 c8 63 09
RSP: 0018:ffffc90001e97ba8 EFLAGS: 00000286
RAX: 1ffffffff1369c13 RBX: 0000000000000200 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff81468639
RBP: ffffffff86723497 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888095ea65c0
R13: 0000000000007494 R14: 0000000000000000 R15: 0000000000000001
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 get_next_corpse net/netfilter/nf_conntrack_core.c:2238 [inline]
 nf_ct_iterate_cleanup+0x9e/0x330 net/netfilter/nf_conntrack_core.c:2261
 nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2346 [inline]
 nf_ct_iterate_cleanup_net+0x113/0x170 net/netfilter/nf_conntrack_core.c:2331
 iterate_cleanup_work+0x45/0x130 net/netfilter/nf_nat_masquerade.c:216
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Modules linked in:
---[ end trace 3518b00731e4dcc9 ]---
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 50 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 00 00 00 4c 8b bd 50 03 00 00 e9 77 fe ff ff
RSP: 0018:ffffc90000da8b18 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8880997e6800 RCX: ffffffff87127bf3
RDX: 000000000000006a RSI: ffffffff87127d62 RDI: 0000000000000350
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff8880649aace3
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880997e6800
R13: 0000000000000078 R14: ffff8880525d3500 R15: 0000000000000010
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005649f55d8000 CR3: 00000000a37a5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400