BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 18a892067 P4D 18a892067 PUD 127bae067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 20290 Comm: syz.1.4725 Tainted: G        W          6.1.90-syzkaller-00023-gedca080b95df #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000446eff8 EFLAGS: 00010246
RAX: 1ffff9200088deb8 RBX: dffffc0000000000 RCX: 0000000000040000
RDX: ffffc9000ab11000 RSI: ffffea0007162e00 RDI: ffff88812db2b080
RBP: ffffc9000446f150 R08: ffffffff81a46b68 R09: fffff94000e2c5c7
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000446f5c0
R13: ffffea0007162e00 R14: ffffc9000446f5d8 R15: 0000000000000000
FS:  00007f845a5706c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000010f94a000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 read_pages+0x89c/0xd40 mm/readahead.c:192
 page_cache_ra_order+0x7fd/0xb30 mm/readahead.c:560
 ondemand_readahead+0x91a/0xee0 mm/readahead.c:695
 page_cache_sync_ra+0x3d6/0x450 mm/readahead.c:722
 page_cache_sync_readahead include/linux/pagemap.h:1257 [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:1124 [inline]
 madvise_walk_vmas mm/madvise.c:1298 [inline]
 do_madvise+0x1604/0x40b0 mm/madvise.c:1477
 __do_sys_madvise mm/madvise.c:1490 [inline]
 __se_sys_madvise mm/madvise.c:1488 [inline]
 __x64_sys_madvise+0xa8/0xc0 mm/madvise.c:1488
 x64_sys_call+0xec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:29
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8459779e79
Code: ff ff c3 66 2e 0f 1f 84 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
RSP: 002b:00007f845a570038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f8459915f80 RCX: 00007f8459779e79
RDX: 0000000000000019 RSI: 0000000000600707 RDI: 0000000020000000
RBP: 00007f84597e7916 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8459915f80 R15: 00007ffe592f4cb8
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000446eff8 EFLAGS: 00010246
RAX: 1ffff9200088deb8 RBX: dffffc0000000000 RCX: 0000000000040000
RDX: ffffc9000ab11000 RSI: ffffea0007162e00 RDI: ffff88812db2b080
RBP: ffffc9000446f150 R08: ffffffff81a46b68 R09: fffff94000e2c5c7
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000446f5c0
R13: ffffea0007162e00 R14: ffffc9000446f5d8 R15: 0000000000000000
FS:  00007f845a5706c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000010f94a000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400