BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1eb371067 P4D 1eb371067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 939 Comm: syz.3.161 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: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881f31fbf00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881de73b1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff98e8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881de73b1c0
FS:  000055557fc89500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001eb226000 CR4: 00000000003406a0
DR0: 0000200000000300 DR1: 0000200000000300 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:update_stack_state+0x166/0x4c0 arch/x86/kernel/unwind_frame.c:211
Code: 8d 38 ff ff ff 48 89 95 40 ff ff ff 48 c1 ea 03 48 89 95 50 ff ff ff 48 89 45 b0 48 c1 e8 03 48 89 85 78 ff ff ff 48 89 5d a0 <eb> 1e 48 8b 73 28 4c 89 ff 48 89 da 48 8b 8d 48 ff ff ff e8 42 28
RSP: 0018:ffff8881eaa0f598 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1103d541ee6 RBX: ffff8881eaa0f708 RCX: 1ffff1103d541ee3
RDX: 1ffff1103d541ee4 RSI: 1ffff1103d541ee2 RDI: ffff8881eaa0f760
RBP: ffff8881eaa0f668 R08: dffffc0000000000 R09: ffff8881eaa0f708
R10: ffffed103d541eed R11: 1ffff1103d541ee1 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8881eaa0f710 R15: ffff8881eaa0ff48
 unwind_next_frame+0x3f7/0x760 arch/x86/kernel/unwind_frame.c:311
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0xf0 kernel/stacktrace.c:123
 save_stack+0x97/0x560 mm/page_owner.c:122
 __reset_page_owner+0x23/0x110 mm/page_owner.c:149
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x2a9/0x3a0 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4954 [inline]
 __free_pages+0xaa/0x110 mm/page_alloc.c:4962
 __vunmap+0x76a/0x8a0 mm/vmalloc.c:2260
 __vfree mm/vmalloc.c:2308 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2338
 kcov_mmap+0x8c/0x120 kernel/kcov.c:474
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x101b/0x15a0 mm/mmap.c:1812
 do_mmap+0x826/0xd90 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x195/0x230 mm/util.c:528
 ksys_mmap_pgoff+0x16f/0x1e0 mm/mmap.c:1631
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:97 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:88 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:88
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fd8835dc9a3
Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 a8 ff ff ff 64 c7
RSP: 002b:00007ffcf9abeea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fd8838042d8 RCX: 00007fd8835dc9a3
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007fd8817e2000
RBP: 00007fd883804240 R08: 00000000000000db R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 00007fd883803fa0
R13: 00007fd883804240 R14: 00000000000000a3 R15: 0000000000000003
Modules linked in:
CR2: 0000000000000000
---[ end trace 657b8528079bba38 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881f31fbf00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881de73b1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff98e8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881de73b1c0
FS:  000055557fc89500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001eb226000 CR4: 00000000003406a0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess), 5 bytes skipped:
   0:	48 89 95 40 ff ff ff 	mov    %rdx,-0xc0(%rbp)
   7:	48 c1 ea 03          	shr    $0x3,%rdx
   b:	48 89 95 50 ff ff ff 	mov    %rdx,-0xb0(%rbp)
  12:	48 89 45 b0          	mov    %rax,-0x50(%rbp)
  16:	48 c1 e8 03          	shr    $0x3,%rax
  1a:	48 89 85 78 ff ff ff 	mov    %rax,-0x88(%rbp)
  21:	48 89 5d a0          	mov    %rbx,-0x60(%rbp)
* 25:	eb 1e                	jmp    0x45 <-- trapping instruction
  27:	48 8b 73 28          	mov    0x28(%rbx),%rsi
  2b:	4c 89 ff             	mov    %r15,%rdi
  2e:	48 89 da             	mov    %rbx,%rdx
  31:	48 8b 8d 48 ff ff ff 	mov    -0xb8(%rbp),%rcx
  38:	e8                   	.byte 0xe8
  39:	42                   	rex.X
  3a:	28                   	.byte 0x28