general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067] CPU: 1 PID: 201 Comm: kworker/u4:4 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:dst_dev_put+0x1d/0x220 net/core/dst.c:156 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc 41 54 55 53 48 89 fb e8 c4 b9 34 fb 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 01 00 00 48 8d 7b 3a 4c 8b 23 48 b8 00 00 00 RSP: 0018:ffffc90000da8da0 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 0000000000000066 RCX: ffffffff86c890e5 RDX: 000000000000000c RSI: ffffffff863fae9c RDI: 0000000000000066 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5fcaa7 R10: 0000000000000000 R11: 0000000000000160 R12: 0000000000000007 R13: fffffbfff15652fc R14: 0000607f51672928 R15: 0000000000000066 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052c538 CR3: 00000000971fe000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rt_fibinfo_free_cpus.part.0+0xd0/0x120 net/ipv4/fib_semantics.c:202 rt_fibinfo_free_cpus net/ipv4/fib_semantics.c:194 [inline] fib_nh_common_release+0xff/0x330 net/ipv4/fib_semantics.c:215 fib6_info_destroy_rcu+0x187/0x210 net/ipv6/ip6_fib.c:174 rcu_do_batch kernel/rcu/tree.c:2428 [inline] rcu_core+0x5c7/0x1190 kernel/rcu/tree.c:2656 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __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+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:lock_acquire+0x27b/0xad0 kernel/locking/lockdep.c:5008 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d fa ca 5b 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7 RSP: 0018:ffffc90001827b80 EFLAGS: 00000286 RAX: 1ffffffff136c781 RBX: ffff8880a8c72500 RCX: 000000008209f4b0 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5fc9e7 R10: fffffbfff18bf93c R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff89bd6b40 R14: 0000000000000000 R15: ffff8880a8c72500 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline] batadv_nc_worker+0x12d/0xe50 net/batman-adv/network-coding.c:718 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: ---[ end trace f970aa56aab0093b ]--- RIP: 0010:dst_dev_put+0x1d/0x220 net/core/dst.c:156 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc 41 54 55 53 48 89 fb e8 c4 b9 34 fb 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 01 00 00 48 8d 7b 3a 4c 8b 23 48 b8 00 00 00 RSP: 0018:ffffc90000da8da0 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 0000000000000066 RCX: ffffffff86c890e5 RDX: 000000000000000c RSI: ffffffff863fae9c RDI: 0000000000000066 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5fcaa7 R10: 0000000000000000 R11: 0000000000000160 R12: 0000000000000007 R13: fffffbfff15652fc R14: 0000607f51672928 R15: 0000000000000066 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052c538 CR3: 00000000971fe000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600