================================================================== BUG: KASAN: use-after-free in __rb_insert lib/rbtree.c:115 [inline] BUG: KASAN: use-after-free in __rb_insert_augmented+0xb7/0x720 lib/rbtree.c:459 Read of size 8 at addr ffff8881c0000008 by task syz-executor/11306 CPU: 1 PID: 11306 Comm: syz-executor Tainted: G W 5.15.185-syzkaller-00032-g0d918fa8e88d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 __rb_insert lib/rbtree.c:115 [inline] __rb_insert_augmented+0xb7/0x720 lib/rbtree.c:459 rb_insert_augmented include/linux/rbtree_augmented.h:50 [inline] vma_interval_tree_insert_after+0x2a1/0x2b0 mm/interval_tree.c:57 dup_mmap kernel/fork.c:632 [inline] dup_mm kernel/fork.c:1522 [inline] copy_mm+0xb1a/0x1390 kernel/fork.c:1574 copy_process+0x115c/0x3210 kernel/fork.c:2348 kernel_clone+0x23f/0x940 kernel/fork.c:2737 __do_sys_clone kernel/fork.c:2863 [inline] __se_sys_clone kernel/fork.c:2847 [inline] __x64_sys_clone+0x176/0x1d0 kernel/fork.c:2847 x64_sys_call+0x41f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fb5362a9193 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffdac678b78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb5362a9193 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 00005555827877d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 00000000000a0590 R15: 00007ffdac678d10 The buggy address belongs to the page: page:ffffea0007000000 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x1c0000 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea0007024008 ffffea0006fc4008 0000000000000000 raw: 0000000000000000 0000000000000008 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0x506dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_ZERO|__GFP_ACCOUNT), pid 15064, ts 529806125010, free_ts 617646104909 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5795 vm_area_alloc_pages mm/vmalloc.c:-1 [inline] __vmalloc_area_node mm/vmalloc.c:2956 [inline] __vmalloc_node_range+0x440/0x840 mm/vmalloc.c:3087 __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline] bpf_map_area_alloc+0xd5/0xe0 kernel/bpf/syscall.c:335 array_map_alloc+0x27c/0x6d0 kernel/bpf/arraymap.c:142 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create+0x455/0x21b0 kernel/bpf/syscall.c:860 __sys_bpf+0x2cf/0x730 kernel/bpf/syscall.c:4615 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735 x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5871 __vunmap+0x84d/0x9e0 mm/vmalloc.c:2652 __vfree mm/vmalloc.c:2701 [inline] vfree+0x8b/0xc0 mm/vmalloc.c:2732 kvfree+0x26/0x40 mm/util.c:662 bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:345 array_map_alloc+0x50f/0x6d0 kernel/bpf/arraymap.c:154 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create+0x455/0x21b0 kernel/bpf/syscall.c:860 __sys_bpf+0x2cf/0x730 kernel/bpf/syscall.c:4615 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735 x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff8881bfffff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881bfffff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8881c0000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881c0000080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881c0000100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================