netlink: 4 bytes leftover after parsing attributes in process `syz.2.566'. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 UID: 0 PID: 8274 Comm: syz.2.566 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:folio_test_anon include/linux/page-flags.h:718 [inline] RIP: 0010:zap_huge_pmd+0x7b1/0x1030 mm/huge_memory.c:2463 Code: 08 00 00 e8 11 e0 92 ff 48 c7 44 24 10 00 00 00 00 4c 8b 3c 24 4c 8d 75 18 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 f1 43 fc ff 49 8b 1e 48 89 de 48 83 RSP: 0018:ffffc90003637310 EFLAGS: 00010206 RAX: 0000000000000003 RBX: f000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 0000000000000000 R08: ffff8880721d502f R09: 1ffff1100e43aa05 R10: dffffc0000000000 R11: ffffed100e43aa06 R12: ffff8880721d5028 R13: fffffffffffffa00 R14: 0000000000000018 R15: ffffc90003637880 FS: 0000000000000000(0000) GS:ffff888124ee0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8abc785900 CR3: 000000000e94a000 CR4: 00000000003526f0 DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081 DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: zap_pmd_range mm/memory.c:1990 [inline] zap_pud_range mm/memory.c:2032 [inline] zap_p4d_range mm/memory.c:2053 [inline] __zap_vma_range+0xa82/0x4bd0 mm/memory.c:2093 unmap_vmas+0x379/0x530 mm/memory.c:2162 exit_mmap+0x280/0xa10 mm/mmap.c:1302 __mmput+0x118/0x430 kernel/fork.c:1180 exit_mm+0x18e/0x250 kernel/exit.c:581 do_exit+0x8b9/0x2490 kernel/exit.c:962 do_group_exit+0x21b/0x2d0 kernel/exit.c:1116 get_signal+0x1284/0x1330 kernel/signal.c:3035 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8abc79c799 Code: Unable to access opcode bytes at 0x7f8abc79c76f. RSP: 002b:00007f8abd5c80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f8abca15fa8 RCX: 00007f8abc79c799 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8abca15fa8 RBP: 00007f8abca15fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8abca16038 R14: 00007fff97631c20 R15: 00007fff97631d08 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:folio_test_anon include/linux/page-flags.h:718 [inline] RIP: 0010:zap_huge_pmd+0x7b1/0x1030 mm/huge_memory.c:2463 Code: 08 00 00 e8 11 e0 92 ff 48 c7 44 24 10 00 00 00 00 4c 8b 3c 24 4c 8d 75 18 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 f1 43 fc ff 49 8b 1e 48 89 de 48 83 RSP: 0018:ffffc90003637310 EFLAGS: 00010206 RAX: 0000000000000003 RBX: f000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 0000000000000000 R08: ffff8880721d502f R09: 1ffff1100e43aa05 R10: dffffc0000000000 R11: ffffed100e43aa06 R12: ffff8880721d5028 R13: fffffffffffffa00 R14: 0000000000000018 R15: ffffc90003637880 FS: 0000000000000000(0000) GS:ffff888124ee0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8abc785900 CR3: 000000000e94a000 CR4: 00000000003526f0 DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081 DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 08 00 or %al,(%rax) 2: 00 e8 add %ch,%al 4: 11 e0 adc %esp,%eax 6: 92 xchg %eax,%edx 7: ff 48 c7 decl -0x39(%rax) a: 44 24 10 rex.R and $0x10,%al d: 00 00 add %al,(%rax) f: 00 00 add %al,(%rax) 11: 4c 8b 3c 24 mov (%rsp),%r15 15: 4c 8d 75 18 lea 0x18(%rbp),%r14 19: 4c 89 f0 mov %r14,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 f1 43 fc ff call 0xfffc4429 38: 49 8b 1e mov (%r14),%rbx 3b: 48 89 de mov %rbx,%rsi 3e: 48 rex.W 3f: 83 .byte 0x83