BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor read access in kernel mode #PF: error_code(0x0001) - permissions violation PGD 800000007ceb7067 P4D 800000007ceb7067 PUD 55a05067 PMD 264eb067 PTE 80000000707fa867 Oops: Oops: 0001 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 6670 Comm: syz.0.52 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline] RIP: 0010:qlist_free_all+0x8d/0xf0 mm/kasan/quarantine.c:176 Code: 48 89 c2 48 c1 e2 06 48 03 15 3f 14 a7 0b 48 8b 42 08 48 89 c1 83 e1 01 48 83 e9 01 48 09 c8 48 21 d0 80 78 33 f5 49 0f 45 c5 <48> 8b 68 08 eb 88 48 83 7d 40 00 75 9b 66 f7 45 08 04 02 75 93 8b RSP: 0018:ffffc90004e772f8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff888036a60001 RCX: ffffffffffffffff RDX: ffffea0000da9800 RSI: 0000000000040001 RDI: ffff888036a60001 RBP: 0000000000000000 R08: ffff888022f30000 R09: 0000000800040001 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888036a60001 R13: 0000000000000000 R14: ffffc90004e77328 R15: 0000000000000040 FS: 00007f5f819bc6c0(0000) GS:ffff88812448a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 000000007629e000 CR4: 00000000003526f0 Call Trace: kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4570 [inline] slab_alloc_node mm/slub.c:4899 [inline] kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4906 ptlock_alloc+0x1f/0x70 mm/memory.c:7579 ptlock_init include/linux/mm.h:3741 [inline] pagetable_pte_ctor include/linux/mm.h:3790 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:79 [inline] pte_alloc_one+0x82/0x3d0 arch/x86/mm/pgtable.c:18 __pte_alloc+0x6d/0x380 mm/memory.c:453 copy_pte_range mm/memory.c:1253 [inline] copy_pmd_range mm/memory.c:1408 [inline] copy_pud_range mm/memory.c:1445 [inline] copy_p4d_range mm/memory.c:1469 [inline] copy_page_range+0x3dd8/0x5b20 mm/memory.c:1555 dup_mmap+0xd44/0x21b0 mm/mmap.c:1840 dup_mm kernel/fork.c:1534 [inline] copy_mm kernel/fork.c:1586 [inline] copy_process+0x6c78/0x7ed0 kernel/fork.c:2264 kernel_clone+0x176/0x9e0 kernel/fork.c:2722 __do_sys_clone3+0x214/0x290 kernel/fork.c:3024 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5f8239ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5f819bbef8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 0000000000000058 RCX: 00007f5f8239ce59 RDX: 00007f5f819bbf10 RSI: 0000000000000058 RDI: 00007f5f819bbf10 RBP: 00007f5f82432d6f R08: 0000000000000000 R09: 0000000000000058 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5f82616218 R14: 00007f5f82616180 R15: 00007ffcb42c36e8 Modules linked in: CR2: 0000000000000008 ---[ end trace 0000000000000000 ]--- RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline] RIP: 0010:qlist_free_all+0x8d/0xf0 mm/kasan/quarantine.c:176 Code: 48 89 c2 48 c1 e2 06 48 03 15 3f 14 a7 0b 48 8b 42 08 48 89 c1 83 e1 01 48 83 e9 01 48 09 c8 48 21 d0 80 78 33 f5 49 0f 45 c5 <48> 8b 68 08 eb 88 48 83 7d 40 00 75 9b 66 f7 45 08 04 02 75 93 8b RSP: 0018:ffffc90004e772f8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff888036a60001 RCX: ffffffffffffffff RDX: ffffea0000da9800 RSI: 0000000000040001 RDI: ffff888036a60001 RBP: 0000000000000000 R08: ffff888022f30000 R09: 0000000800040001 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888036a60001 R13: 0000000000000000 R14: ffffc90004e77328 R15: 0000000000000040 FS: 00007f5f819bc6c0(0000) GS:ffff88812448a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 000000007629e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 48 89 c2 mov %rax,%rdx 3: 48 c1 e2 06 shl $0x6,%rdx 7: 48 03 15 3f 14 a7 0b add 0xba7143f(%rip),%rdx # 0xba7144d e: 48 8b 42 08 mov 0x8(%rdx),%rax 12: 48 89 c1 mov %rax,%rcx 15: 83 e1 01 and $0x1,%ecx 18: 48 83 e9 01 sub $0x1,%rcx 1c: 48 09 c8 or %rcx,%rax 1f: 48 21 d0 and %rdx,%rax 22: 80 78 33 f5 cmpb $0xf5,0x33(%rax) 26: 49 0f 45 c5 cmovne %r13,%rax * 2a: 48 8b 68 08 mov 0x8(%rax),%rbp <-- trapping instruction 2e: eb 88 jmp 0xffffffb8 30: 48 83 7d 40 00 cmpq $0x0,0x40(%rbp) 35: 75 9b jne 0xffffffd2 37: 66 f7 45 08 04 02 testw $0x204,0x8(%rbp) 3d: 75 93 jne 0xffffffd2 3f: 8b .byte 0x8b