BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 7991b067 P4D 7991b067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3644 Comm: syz-executor.4 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:ffffc900042df7e0 EFLAGS: 00010292 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888027258000 RDX: 0000000000000000 RSI: ffffea0002495640 RDI: ffff88806f559e38 RBP: ffffea0002469d00 R08: ffffffff81b5b45b R09: fffff94000492ac9 R10: fffff94000492ac9 R11: 1ffffd4000492ac8 R12: ffffea0002469d00 R13: dffffc0000000000 R14: ffffea0002495640 R15: ffffea0002469d08 FS: 0000555555873400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000035168000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_next_nat_page+0x3a9/0x770 fs/f2fs/node.c:154 __flush_nat_entry_set fs/f2fs/node.c:3005 [inline] f2fs_flush_nat_entries+0x9e3/0x1bf0 fs/f2fs/node.c:3109 f2fs_write_checkpoint+0x14f1/0x1d70 fs/f2fs/checkpoint.c:1667 kill_f2fs_super+0x22e/0x3c0 fs/f2fs/super.c:4538 deactivate_locked_super+0xa7/0xf0 fs/super.c:331 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186 task_work_run+0x146/0x1c0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:294 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f1023c8ca17 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd840e9448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f1023c8ca17 RDX: 00007ffd840e951b RSI: 000000000000000a RDI: 00007ffd840e9510 RBP: 00007ffd840e9510 R08: 00000000ffffffff R09: 00007ffd840e92e0 R10: 00005555558748b3 R11: 0000000000000246 R12: 00007f1023ce55f6 R13: 00007ffd840ea5d0 R14: 0000555555874810 R15: 00007ffd840ea610 Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:ffffc900042df7e0 EFLAGS: 00010292 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888027258000 RDX: 0000000000000000 RSI: ffffea0002495640 RDI: ffff88806f559e38 RBP: ffffea0002469d00 R08: ffffffff81b5b45b R09: fffff94000492ac9 R10: fffff94000492ac9 R11: 1ffffd4000492ac8 R12: ffffea0002469d00 R13: dffffc0000000000 R14: ffffea0002495640 R15: ffffea0002469d08 FS: 0000555555873400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000035168000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400