BUG: kernel NULL pointer dereference, address: 0000000000000038 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 11552f067 P4D 11552f067 PUD 115533067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 347 Comm: syz-executor.0 Not tainted 6.1.1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:do_rmdir+0xfa/0x1c0 fs/namei.c:4174 Code: 8b 7e 30 b8 a0 00 00 00 48 01 c7 e8 80 2f b5 00 48 8d 7d b0 4c 89 f6 44 89 e2 e8 61 03 00 00 48 89 c3 48 3d 00 f0 ff ff 77 2d <48> 83 7b 30 00 74 15 49 8b 7f 18 49 8b 76 30 48 89 da e8 ef fa ff RSP: 0018:ffffc90000707eb0 EFLAGS: 00010203 RAX: 0000000000000008 RBX: 0000000000000008 RCX: 0000000000000003 RDX: 0000000300000000 RSI: 0000000000000000 RDI: ffff88810b276a80 RBP: ffffc90000707f10 R08: 00000000ffffff9c R09: 000000008080007f R10: ffff8881137bac00 R11: ffff888100041400 R12: 0000000000000000 R13: 0000000000000001 R14: ffff88810ba91780 R15: ffff888113726ca0 FS: 00007f48d5ba46c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000038 CR3: 0000000115521000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __do_sys_rmdir fs/namei.c:4201 [inline] __se_sys_rmdir fs/namei.c:4199 [inline] __x64_sys_rmdir+0x1e/0x30 fs/namei.c:4199 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f48d4e7cae9 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:00007f48d5ba40c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 00007f48d4f9bf80 RCX: 00007f48d4e7cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 00007f48d4ec847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f48d4f9bf80 R15: 00007ffc81ecc498 Modules linked in: CR2: 0000000000000038 ---[ end trace 0000000000000000 ]--- RIP: 0010:do_rmdir+0xfa/0x1c0 fs/namei.c:4174 Code: 8b 7e 30 b8 a0 00 00 00 48 01 c7 e8 80 2f b5 00 48 8d 7d b0 4c 89 f6 44 89 e2 e8 61 03 00 00 48 89 c3 48 3d 00 f0 ff ff 77 2d <48> 83 7b 30 00 74 15 49 8b 7f 18 49 8b 76 30 48 89 da e8 ef fa ff RSP: 0018:ffffc90000707eb0 EFLAGS: 00010203 RAX: 0000000000000008 RBX: 0000000000000008 RCX: 0000000000000003 RDX: 0000000300000000 RSI: 0000000000000000 RDI: ffff88810b276a80 RBP: ffffc90000707f10 R08: 00000000ffffff9c R09: 000000008080007f R10: ffff8881137bac00 R11: ffff888100041400 R12: 0000000000000000 R13: 0000000000000001 R14: ffff88810ba91780 R15: ffff888113726ca0 FS: 00007f48d5ba46c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000038 CR3: 0000000115521000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 7e 30 mov 0x30(%rsi),%edi 3: b8 a0 00 00 00 mov $0xa0,%eax 8: 48 01 c7 add %rax,%rdi b: e8 80 2f b5 00 call 0xb52f90 10: 48 8d 7d b0 lea -0x50(%rbp),%rdi 14: 4c 89 f6 mov %r14,%rsi 17: 44 89 e2 mov %r12d,%edx 1a: e8 61 03 00 00 call 0x380 1f: 48 89 c3 mov %rax,%rbx 22: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 28: 77 2d ja 0x57 * 2a: 48 83 7b 30 00 cmpq $0x0,0x30(%rbx) <-- trapping instruction 2f: 74 15 je 0x46 31: 49 8b 7f 18 mov 0x18(%r15),%rdi 35: 49 8b 76 30 mov 0x30(%r14),%rsi 39: 48 89 da mov %rbx,%rdx 3c: e8 .byte 0xe8 3d: ef out %eax,(%dx) 3e: fa cli 3f: ff .byte 0xff