BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 988 Comm: syz.4.176 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:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881ec782f40
RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881e8aef1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9ba8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e8aef1c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000005c0e000 CR4: 00000000003406b0
DR0: 0100000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:186
Code: 00 00 55 48 89 e5 be 0c 00 00 00 48 c7 c7 00 96 d1 85 e8 6b f2 2d 00 5d c3 00 00 90 90 00 00 90 90 00 55 48 89 e5 48 8b 45 08 <65> 48 8b 0d 90 0e a3 7e 65 8b 15 95 0e a3 7e f7 c2 00 01 1f 00 74
RSP: 0018:ffff8881eae075d0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81846e59 RBX: 00007fe879e6a000 RCX: 0000000000000000
RDX: ffff8881ec782f40 RSI: 000000000023ffff RDI: 00000000001d9631
RBP: ffff8881eae075d0 R08: dffffc0000000000 R09: ffffed103d8f05e9
R10: ffffed103d8f05e9 R11: 1ffff1103d8f05e8 R12: 00000000001d9631
R13: 000000000023ffff R14: 80000001d9631007 R15: ffff8881edab6de0
 vm_normal_page+0x99/0x1f0 mm/memory.c:658
 zap_pte_range mm/memory.c:1078 [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+0xaf6/0x1b20 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
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x13e/0x170 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fe87a9e3969
Code: Bad RIP value.
RSP: 002b:00007fe87904c0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fe87ac0afa8 RCX: 00007fe87a9e3969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe87ac0afa8
RBP: 00007fe87ac0afa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe87ac0afac
R13: 0000000000000000 R14: 00007ffdce252bb0 R15: 00007ffdce252c98
Modules linked in:
CR2: 0000000000000000
---[ end trace 1de15254f41ab6a5 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881ec782f40
RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881e8aef1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9ba8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e8aef1c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000005c0e000 CR4: 00000000003406b0
DR0: 0100000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	55                   	push   %rbp
   3:	48 89 e5             	mov    %rsp,%rbp
   6:	be 0c 00 00 00       	mov    $0xc,%esi
   b:	48 c7 c7 00 96 d1 85 	mov    $0xffffffff85d19600,%rdi
  12:	e8 6b f2 2d 00       	call   0x2df282
  17:	5d                   	pop    %rbp
  18:	c3                   	ret
  19:	00 00                	add    %al,(%rax)
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	00 00                	add    %al,(%rax)
  1f:	90                   	nop
  20:	90                   	nop
  21:	00 55 48             	add    %dl,0x48(%rbp)
  24:	89 e5                	mov    %esp,%ebp
  26:	48 8b 45 08          	mov    0x8(%rbp),%rax
* 2a:	65 48 8b 0d 90 0e a3 	mov    %gs:0x7ea30e90(%rip),%rcx        # 0x7ea30ec2 <-- trapping instruction
  31:	7e
  32:	65 8b 15 95 0e a3 7e 	mov    %gs:0x7ea30e95(%rip),%edx        # 0x7ea30ece
  39:	f7 c2 00 01 1f 00    	test   $0x1f0100,%edx
  3f:	74                   	.byte 0x74