BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1f28f2067 P4D 1f28f2067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 705 Comm: syz.1.93 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e4036e40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881cd93b1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9880
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881cd93b1c0
FS:  00007f4f9a80e6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e9ac2000 CR4: 00000000003406a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600
Call Trace:
 <IRQ>
 call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x81d/0xb60 kernel/time/timer.c:1817
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x236/0x660 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x197/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x1/0x80 kernel/kcov.c:273
Code: 44 01 08 03 00 00 00 4a 89 7c 01 10 4a 89 74 01 18 4a 89 44 01 20 48 ff c2 48 89 11 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 48 8b 45 08 65 48 8b 15 40 0b a3 7e 65 8b 0d 45 0b a3 7e
RSP: 0018:ffff8881e401f4d0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff82209b0e RBX: 0000000000000001 RCX: ffff8881e4036e40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881e401f598 R08: dffffc0000000000 R09: fffff94000e7408f
R10: fffff94000e7408f R11: 1ffffd4000e7408e R12: ffffffff84da3280
R13: 1ffff1103c803ea0 R14: 0000000080000001 R15: ffffffff84c34be0
 __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:64
 __mod_lruvec_state+0x11e/0x2a0 mm/memcontrol.c:766
 __mod_lruvec_page_state include/linux/memcontrol.h:770 [inline]
 page_remove_file_rmap mm/rmap.c:1261 [inline]
 page_remove_rmap+0x53b/0x800 mm/rmap.c:1317
 zap_pte_range mm/memory.c:1105 [inline]
 zap_pmd_range mm/memory.c:1222 [inline]
 zap_pud_range mm/memory.c:1251 [inline]
 zap_p4d_range mm/memory.c:1272 [inline]
 unmap_page_range+0xe8f/0x1b20 mm/memory.c:1293
 unmap_single_vma mm/memory.c:1338 [inline]
 unmap_vmas+0x245/0x340 mm/memory.c:1370
 exit_mmap+0x2bb/0x520 mm/mmap.c:3191
 __mmput+0x92/0x2e0 kernel/fork.c:1101
 mmput+0x47/0x60 kernel/fork.c:1122
 exit_mm kernel/exit.c:538 [inline]
 do_exit+0x99f/0x2660 kernel/exit.c:848
 do_group_exit+0x13e/0x300 kernel/exit.c:984
 get_signal+0xdee/0x13d0 kernel/signal.c:2738
 do_signal+0xad/0xda0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc4/0x1b0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x18e/0x1f0 arch/x86/entry/common.c:194
 ret_from_intr+0x1c/0x1c
RIP: 0033:0x1457
Code: Bad RIP value.
RSP: 002b:0000200000000178 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f4f9c3ccfa0 RCX: 00007f4f9c1a5969
RDX: 0000200000000180 RSI: 0000200000000170 RDI: 0000000042800600
RBP: 00007f4f9c227ab1 R08: 0000200000000200 R09: 0000200000000200
R10: 00002000000001c0 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4f9c3ccfa0 R15: 00007ffc96834fc8
Modules linked in:
CR2: 0000000000000000
---[ end trace c1746bdf7c14761a ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e4036e40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881cd93b1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9880
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881cd93b1c0
FS:  00007f4f9a80e6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e9ac2000 CR4: 00000000003406a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	44 01 08             	add    %r9d,(%rax)
   3:	03 00                	add    (%rax),%eax
   5:	00 00                	add    %al,(%rax)
   7:	4a 89 7c 01 10       	mov    %rdi,0x10(%rcx,%r8,1)
   c:	4a 89 74 01 18       	mov    %rsi,0x18(%rcx,%r8,1)
  11:	4a 89 44 01 20       	mov    %rax,0x20(%rcx,%r8,1)
  16:	48 ff c2             	inc    %rdx
  19:	48 89 11             	mov    %rdx,(%rcx)
  1c:	5d                   	pop    %rbp
  1d:	c3                   	ret
  1e:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  25:	00 00 00 00
  29:	55                   	push   %rbp
* 2a:	48 89 e5             	mov    %rsp,%rbp <-- trapping instruction
  2d:	48 8b 45 08          	mov    0x8(%rbp),%rax
  31:	65 48 8b 15 40 0b a3 	mov    %gs:0x7ea30b40(%rip),%rdx        # 0x7ea30b79
  38:	7e
  39:	65 8b 0d 45 0b a3 7e 	mov    %gs:0x7ea30b45(%rip),%ecx        # 0x7ea30b85