RSP: 002b:00007f60489fe038 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007f60499b6080 RCX: 00007f604978e969 RDX: ffffffffffffff9c RSI: 0000200000000480 RDI: ffffffffffffff9c RBP: 00007f60489fe090 R08: 0000000000000002 R09: 0000000000000000 R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f60499b6080 R15: 00007ffd88a78228 BUG: kernel NULL pointer dereference, address: 0000000000000018 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 800000017187b067 P4D 800000017187b067 PUD 0 Oops: Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 UID: 0 PID: 7480 Comm: syz.2.899 Not tainted 6.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:afs_dynroot_d_release+0xb/0x20 fs/afs/dynroot.c:169 Code: cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b b7 b0 00 00 00 <48> 8b 7e 18 ba 16 00 00 00 e9 17 72 ff ff 0f 1f 80 00 00 00 00 90 RSP: 0018:ffffc900053dfd80 EFLAGS: 00010282 RAX: ffffffff82e766c0 RBX: ffff88817b126c30 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88817b126c30 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000089 R10: 0000000000000002 R11: ffffffff8199ead0 R12: ffff8881037eb001 R13: ffff88817b126c30 R14: ffff88817b126ce8 R15: 00000000fffffffe FS: 00007f60489fe6c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 0000000104fea000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __dentry_kill+0xd0/0x1e0 fs/dcache.c:648 dput+0xa7/0xf0 fs/dcache.c:885 do_renameat2+0x4b5/0x650 fs/namei.c:5230 __do_sys_renameat2 fs/namei.c:5260 [inline] __se_sys_renameat2 fs/namei.c:5257 [inline] __x64_sys_renameat2+0x47/0x60 fs/namei.c:5257 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8f/0x170 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f604978e969 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:00007f60489fe038 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007f60499b6080 RCX: 00007f604978e969 RDX: ffffffffffffff9c RSI: 0000200000000480 RDI: ffffffffffffff9c RBP: 00007f60489fe090 R08: 0000000000000002 R09: 0000000000000000 R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f60499b6080 R15: 00007ffd88a78228 Modules linked in: CR2: 0000000000000018 ---[ end trace 0000000000000000 ]--- RIP: 0010:afs_dynroot_d_release+0xb/0x20 fs/afs/dynroot.c:169 Code: cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b b7 b0 00 00 00 <48> 8b 7e 18 ba 16 00 00 00 e9 17 72 ff ff 0f 1f 80 00 00 00 00 90 RSP: 0018:ffffc900053dfd80 EFLAGS: 00010282 RAX: ffffffff82e766c0 RBX: ffff88817b126c30 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88817b126c30 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000089 R10: 0000000000000002 R11: ffffffff8199ead0 R12: ffff8881037eb001 R13: ffff88817b126c30 R14: ffff88817b126ce8 R15: 00000000fffffffe FS: 00007f60489fe6c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 0000000104fea000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: cc int3 1: 66 66 66 66 66 2e 0f data16 data16 data16 data16 cs nopw 0x0(%rax,%rax,1) 8: 1f 84 00 00 00 00 00 f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: f3 0f 1e fa endbr64 23: 48 8b b7 b0 00 00 00 mov 0xb0(%rdi),%rsi * 2a: 48 8b 7e 18 mov 0x18(%rsi),%rdi <-- trapping instruction 2e: ba 16 00 00 00 mov $0x16,%edx 33: e9 17 72 ff ff jmp 0xffff724f 38: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 3f: 90 nop