BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 9058b067 P4D 9058b067 PUD 97941067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.6.0-rc2-next-20200224-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffffc90000cffca8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc90000cffd20 RCX: ffffffff815b0b60
RDX: 1ffff110000266c4 RSI: 0000000000000008 RDI: ffff888000133618
RBP: ffffc90000cffda8 R08: 1ffffffff16a3cfa R09: fffffbfff16a3cfb
R10: ffff8880a99f0ae0 R11: ffff8880a99f0240 R12: dffffc0000000000
R13: ffff888000133618 R14: ffffc90000cffd80 R15: ffff8880a99f0240
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000381a7000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rcu_do_batch kernel/rcu/tree.c:2207 [inline]
 rcu_core+0x5e3/0x1440 kernel/rcu/tree.c:2434
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2443
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 run_ksoftirqd kernel/softirq.c:603 [inline]
 run_ksoftirqd+0x8e/0x110 kernel/softirq.c:595
 smpboot_thread_fn+0x6a3/0xa40 kernel/smpboot.c:165
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
CR2: 0000000000000000
---[ end trace 996fcfac5f16ed13 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffffc90000cffca8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc90000cffd20 RCX: ffffffff815b0b60
RDX: 1ffff110000266c4 RSI: 0000000000000008 RDI: ffff888000133618
RBP: ffffc90000cffda8 R08: 1ffffffff16a3cfa R09: fffffbfff16a3cfb
R10: ffff8880a99f0ae0 R11: ffff8880a99f0240 R12: dffffc0000000000
R13: ffff888000133618 R14: ffffc90000cffd80 R15: ffff8880a99f0240
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000381a7000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400