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BUG: KASAN: slab-out-of-bounds in pcpu_alloc_noprof+0xe43/0x16b0
Write of size 32768 at addr ffffe8ffff900000 by task syz.3.7860/23787

CPU: 0 UID: 0 PID: 23787 Comm: syz.3.7860 Not tainted 6.16.0-rc5-syzkaller-00212-g9f735b6f8a77 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xd2/0x2b0
 kasan_report+0x118/0x150
 kasan_check_range+0x2b0/0x2c0
 __asan_memset+0x22/0x50
 pcpu_alloc_noprof+0xe43/0x16b0
 bpf_map_alloc_percpu+0xbc/0x1b0
 prealloc_init+0x225/0x630
 htab_map_alloc+0x6ce/0xc70
 map_create+0xaa3/0x1310
 __sys_bpf+0x67e/0x860
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7328f8e9a9
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:00007f7329ecf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f73291b5fa0 RCX: 00007f7328f8e9a9
RDX: 0000000000000050 RSI: 00002000000006c0 RDI: 0000000000000000
RBP: 00007f7329010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f73291b5fa0 R15: 00007ffef5f1b5d8
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffe8ffff800000, ffffe8ffffa00000) created by:
 pcpu_get_vm_areas+0x0/0x47c0

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888100000000 pfn:0x10fb67
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff888100000000 ffff888031ac2c00 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2cc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN), pid 23787, tgid 23786 (syz.3.7860), ts 364216615323, free_ts 362768460889
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 __alloc_pages_noprof+0xa/0x30
 pcpu_populate_chunk+0x182/0xb30
 pcpu_alloc_noprof+0xcbf/0x16b0
 bpf_map_alloc_percpu+0xbc/0x1b0
 prealloc_init+0x225/0x630
 htab_map_alloc+0x6ce/0xc70
 map_create+0xaa3/0x1310
 __sys_bpf+0x67e/0x860
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 15 tgid 15 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __tlb_remove_table+0x2d2/0x3b0
 tlb_remove_table_rcu+0x85/0x100
 rcu_core+0xca8/0x1710
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_irq_work+0xa3/0xc0
 asm_sysvec_irq_work+0x1a/0x20

Memory state around the buggy address:
 ffffe8ffff902000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffe8ffff902080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffe8ffff902100: 00 00 00 00 00 00 00 00 00 00 fe ff 00 00 00 00
                                                 ^
 ffffe8ffff902180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffe8ffff902200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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