Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 7181 Comm: syz.2.2307 Not tainted syzkaller #0 0043dfd2fbaf315da186ee57f2b2b1c8bfff300f Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__d_entry_type include/linux/dcache.h:415 [inline] RIP: 0010:d_is_miss include/linux/dcache.h:420 [inline] RIP: 0010:d_is_negative include/linux/dcache.h:466 [inline] RIP: 0010:do_renameat2+0x47e/0xc80 fs/namei.c:5118 Code: 74 24 48 44 89 fa e8 81 e3 fe ff 48 3d 01 f0 ff ff 72 0d 49 89 c5 e8 21 20 9b ff e9 3d 04 00 00 4c 89 e1 49 89 c4 49 c1 ec 03 <41> 0f b6 14 0c 84 d2 48 89 44 24 20 0f 85 f2 05 00 00 8b 18 be 00 RSP: 0018:ffffc9000cd7fd00 EFLAGS: 00010247 RAX: 0000000000000005 RBX: ffff88812809e600 RCX: dffffc0000000000 RDX: ffffc90011c64000 RSI: 000000000000027a RDI: 000000000000027b RBP: ffffc9000cd7fee8 R08: ffff8881f6f50b87 R09: 1ffff1103edea170 R10: dffffc0000000000 R11: ffffed103edea171 R12: 0000000000000000 R13: 0000000000000000 R14: 1ffff920019aff01 R15: 0000000000000000 FS: 00007fa0767d66c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa0767d5f98 CR3: 00000001217a0000 CR4: 00000000003526b0 DR0: 0000000100000000 DR1: 0000000000001000 DR2: 0000000000000006 DR3: 0000000000000800 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __do_sys_rename fs/namei.c:5217 [inline] __se_sys_rename fs/namei.c:5215 [inline] __x64_sys_rename+0x86/0xa0 fs/namei.c:5215 x64_sys_call+0x150b/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fa077d8ebe9 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:00007fa0767d6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007fa077fb6180 RCX: 00007fa077d8ebe9 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000200000000280 RBP: 00007fa077e11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa077fb6218 R14: 00007fa077fb6180 R15: 00007ffd6a487978 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__d_entry_type include/linux/dcache.h:415 [inline] RIP: 0010:d_is_miss include/linux/dcache.h:420 [inline] RIP: 0010:d_is_negative include/linux/dcache.h:466 [inline] RIP: 0010:do_renameat2+0x47e/0xc80 fs/namei.c:5118 Code: 74 24 48 44 89 fa e8 81 e3 fe ff 48 3d 01 f0 ff ff 72 0d 49 89 c5 e8 21 20 9b ff e9 3d 04 00 00 4c 89 e1 49 89 c4 49 c1 ec 03 <41> 0f b6 14 0c 84 d2 48 89 44 24 20 0f 85 f2 05 00 00 8b 18 be 00 RSP: 0018:ffffc9000cd7fd00 EFLAGS: 00010247 RAX: 0000000000000005 RBX: ffff88812809e600 RCX: dffffc0000000000 RDX: ffffc90011c64000 RSI: 000000000000027a RDI: 000000000000027b RBP: ffffc9000cd7fee8 R08: ffff8881f6f50b87 R09: 1ffff1103edea170 R10: dffffc0000000000 R11: ffffed103edea171 R12: 0000000000000000 R13: 0000000000000000 R14: 1ffff920019aff01 R15: 0000000000000000 FS: 00007fa0767d66c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f439e372020 CR3: 00000001217a0000 CR4: 00000000003526b0 ---------------- Code disassembly (best guess): 0: 74 24 je 0x26 2: 48 rex.W 3: 44 89 fa mov %r15d,%edx 6: e8 81 e3 fe ff call 0xfffee38c b: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax 11: 72 0d jb 0x20 13: 49 89 c5 mov %rax,%r13 16: e8 21 20 9b ff call 0xff9b203c 1b: e9 3d 04 00 00 jmp 0x45d 20: 4c 89 e1 mov %r12,%rcx 23: 49 89 c4 mov %rax,%r12 26: 49 c1 ec 03 shr $0x3,%r12 * 2a: 41 0f b6 14 0c movzbl (%r12,%rcx,1),%edx <-- trapping instruction 2f: 84 d2 test %dl,%dl 31: 48 89 44 24 20 mov %rax,0x20(%rsp) 36: 0f 85 f2 05 00 00 jne 0x62e 3c: 8b 18 mov (%rax),%ebx 3e: be .byte 0xbe