BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 123159067 P4D 123159067 PUD 121a46067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 774 Comm: syz.2.94 Not tainted 6.1.93-syzkaller-00068-gb5e374dda921 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90000b46ff8 EFLAGS: 00010246
RAX: 1ffff92000168eb8 RBX: dffffc0000000000 RCX: 0000000000040000
RDX: ffffc9001064c000 RSI: ffffea0004c5a000 RDI: ffff888113955380
RBP: ffffc90000b47150 R08: ffffffff81a46b48 R09: fffff9400098b407
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000b475c0
R13: ffffea0004c5a000 R14: ffffc90000b475d8 R15: 0000000000000000
FS:  00007f44c8ae96c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001342dc000 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+0x822/0xc40 mm/readahead.c:563
 ondemand_readahead+0x91a/0xee0 mm/readahead.c:699
 page_cache_sync_ra+0x3d6/0x450 mm/readahead.c:726
 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: 0033:0x7f44c7d79eb9
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:00007f44c8ae9038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f44c7f16058 RCX: 00007f44c7d79eb9
RDX: 0000000000000019 RSI: 0000000000600702 RDI: 0000000020000000
RBP: 00007f44c7de793e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f44c7f16058 R15: 00007fff5cd4eae8
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90000b46ff8 EFLAGS: 00010246
RAX: 1ffff92000168eb8 RBX: dffffc0000000000 RCX: 0000000000040000
RDX: ffffc9001064c000 RSI: ffffea0004c5a000 RDI: ffff888113955380
RBP: ffffc90000b47150 R08: ffffffff81a46b48 R09: fffff9400098b407
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000b475c0
R13: ffffea0004c5a000 R14: ffffc90000b475d8 R15: 0000000000000000
FS:  00007f44c8ae96c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001342dc000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400