BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1de1c7067 P4D 1de1c7067 PUD 1e3ee5067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 549 Comm: kworker/u4:4 Not tainted 5.4.265-syzkaller-00009-g43a5ead9254d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: netns cleanup_net
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d78 EFLAGS: 00010202
RAX: ffffffff8154e38a RBX: 0000000000000101 RCX: ffff8881e5a75e80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e4cd71c0
RBP: ffff8881f6e09f28 R08: ffffffff8154dfce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000fffff450
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e4cd71c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e9082000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1418
 expire_timers kernel/time/timer.c:1463 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1787
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1800
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1086
 </IRQ>
Modules linked in:
CR2: 0000000000000000
---[ end trace 22e1ec8893995154 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d78 EFLAGS: 00010202
RAX: ffffffff8154e38a RBX: 0000000000000101 RCX: ffff8881e5a75e80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e4cd71c0
RBP: ffff8881f6e09f28 R08: ffffffff8154dfce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000fffff450
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e4cd71c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e9082000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600