BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 125d69067 P4D 125d69067 PUD 176388067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 19837 Comm: syz-executor.4 Tainted: G        W          6.1.75-syzkaller-00003-g4d55129aea65 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc900011e70d8 EFLAGS: 00010246
RAX: 1ffff9200023ced0 RBX: dffffc0000000000 RCX: 0000000000040000
RDX: ffffc90005c6c000 RSI: ffffea0005791500 RDI: ffff888128f85980
RBP: ffffc900011e7230 R08: ffffffff81a42a98 R09: fffff94000af22a7
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc900011e7680
R13: ffffea0005791500 R14: ffffc900011e7698 R15: 0000000000000000
FS:  00007f3e067c86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001673e4000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 read_pages+0x89c/0xd40 mm/readahead.c:192
 page_cache_ra_order+0x7f4/0xb40 mm/readahead.c:560
 ondemand_readahead+0x92a/0xef0 mm/readahead.c:695
 page_cache_sync_ra+0x3d6/0x450 mm/readahead.c:722
 page_cache_sync_readahead include/linux/pagemap.h:1251 [inline]
 collapse_file mm/khugepaged.c:1877 [inline]
 hpage_collapse_scan_file+0x19ba/0x46e0 mm/khugepaged.c:2239
 madvise_collapse+0x639/0xcf0 mm/khugepaged.c:2694
 madvise_vma_behavior mm/madvise.c:1113 [inline]
 madvise_walk_vmas mm/madvise.c:1287 [inline]
 do_madvise+0x15c1/0x3df0 mm/madvise.c:1466
 __do_sys_madvise mm/madvise.c:1479 [inline]
 __se_sys_madvise mm/madvise.c:1477 [inline]
 __x64_sys_madvise+0xa8/0xc0 mm/madvise.c:1477
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3e05a7dd69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3e067c80c8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f3e05babf80 RCX: 00007f3e05a7dd69
RDX: 0000000000000019 RSI: 000000000060005f RDI: 0000000020000000
RBP: 00007f3e05aca49e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f3e05babf80 R15: 00007ffca29e8358
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc900011e70d8 EFLAGS: 00010246
RAX: 1ffff9200023ced0 RBX: dffffc0000000000 RCX: 0000000000040000
RDX: ffffc90005c6c000 RSI: ffffea0005791500 RDI: ffff888128f85980
RBP: ffffc900011e7230 R08: ffffffff81a42a98 R09: fffff94000af22a7
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc900011e7680
R13: ffffea0005791500 R14: ffffc900011e7698 R15: 0000000000000000
FS:  00007f3e067c86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001673e4000 CR4: 00000000003526b0