BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1d7c41067 P4D 1d7c41067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10665 Comm: syz.6.2856 Tainted: G        W         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: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881f30c0fc0
RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881b046b1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000fffff7d8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881b046b1c0
FS:  00007eff43b836c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e68b0000 CR4: 00000000003406b0
DR0: 0000000000000000 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:__read_once_size include/linux/compiler.h:268 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:155 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:208 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x21/0x80 kernel/kcov.c:248
Code: 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 8b 45 08 65 48 8b 15 40 0d a3 7e 65 8b 0d 45 0d a3 7e f7 c1 00 01 1f 00 74 02 5d c3 <8b> 8a 00 0a 00 00 83 f9 03 75 f3 48 8b 8a 08 0a 00 00 44 8b 8a 04
RSP: 0018:ffff8881e1dae4f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff814fbc64 RBX: 0000000000000010 RCX: 0000000080000000
RDX: ffff8881f30c0fc0 RSI: 0000000000000010 RDI: 000000000000000d
RBP: ffff8881e1dae4f8 R08: dffffc0000000000 R09: ffff8881e1dae568
R10: ffffed103c3b5cb9 R11: 1ffff1103c3b5cad R12: ffff8881e1dae620
R13: 1ffff1103c3b5cc6 R14: dffffc0000000000 R15: 000000000000000d
 stack_trace_consume_entry+0x74/0x250 kernel/stacktrace.c:86
 arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0xaa/0xf0 kernel/stacktrace.c:123
 save_stack+0x97/0x560 mm/page_owner.c:122
 __set_page_owner+0x39/0x1e0 mm/page_owner.c:191
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x35e/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894
 __alloc_pages include/linux/gfp.h:503 [inline]
 __alloc_pages_node include/linux/gfp.h:516 [inline]
 alloc_pages_node include/linux/gfp.h:530 [inline]
 shmem_alloc_page mm/shmem.c:1503 [inline]
 shmem_alloc_and_acct_page+0x40b/0x820 mm/shmem.c:1528
 shmem_getpage_gfp+0xe89/0x2370 mm/shmem.c:1852
 shmem_getpage mm/shmem.c:154 [inline]
 shmem_write_begin+0xce/0x1b0 mm/shmem.c:2447
 generic_perform_write+0x2b8/0x500 mm/filemap.c:3450
 __generic_file_write_iter+0x24b/0x480 mm/filemap.c:3579
 generic_file_write_iter+0x48d/0x620 mm/filemap.c:3611
 call_write_iter include/linux/fs.h:1991 [inline]
 new_sync_write fs/read_write.c:483 [inline]
 __vfs_write+0x480/0x5d0 fs/read_write.c:496
 __kernel_write+0xea/0x320 fs/read_write.c:515
 dump_emit+0x1c0/0x2c0 fs/coredump.c:838
 elf_core_dump+0x3465/0x3bd0 fs/binfmt_elf.c:2352
 do_coredump+0x1d8c/0x2ab0 fs/coredump.c:801
 get_signal+0xdb7/0x13d0 kernel/signal.c:2732
 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: 0033:0x7eff4551a971
Code: 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 <c3> 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00002000000000a0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007eff45741fa0 RCX: 00007eff4551a969
RDX: 00002000000000c0 RSI: 00002000000000a0 RDI: 0000000000242000
RBP: 00007eff4559cab1 R08: 0000200000000200 R09: 0000200000000200
R10: 00002000000001c0 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007eff45741fa0 R15: 00007ffcc606fc28
Modules linked in:
CR2: 0000000000000000
---[ end trace 5aad8c2728a036f7 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881f30c0fc0
RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881b046b1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000fffff7d8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881b046b1c0
FS:  00007eff43b836c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e68b0000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	2e 0f 1f 84 00 00 00 	cs nopl 0x0(%rax,%rax,1)
   7:	00 00
   9:	55                   	push   %rbp
   a:	48 89 e5             	mov    %rsp,%rbp
   d:	48 8b 45 08          	mov    0x8(%rbp),%rax
  11:	65 48 8b 15 40 0d a3 	mov    %gs:0x7ea30d40(%rip),%rdx        # 0x7ea30d59
  18:	7e
  19:	65 8b 0d 45 0d a3 7e 	mov    %gs:0x7ea30d45(%rip),%ecx        # 0x7ea30d65
  20:	f7 c1 00 01 1f 00    	test   $0x1f0100,%ecx
  26:	74 02                	je     0x2a
  28:	5d                   	pop    %rbp
  29:	c3                   	ret
* 2a:	8b 8a 00 0a 00 00    	mov    0xa00(%rdx),%ecx <-- trapping instruction
  30:	83 f9 03             	cmp    $0x3,%ecx
  33:	75 f3                	jne    0x28
  35:	48 8b 8a 08 0a 00 00 	mov    0xa08(%rdx),%rcx
  3c:	44                   	rex.R
  3d:	8b                   	.byte 0x8b
  3e:	8a                   	.byte 0x8a
  3f:	04                   	.byte 0x4