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BUG: KASAN: null-ptr-deref in drop_buffers+0x65/0x4f0
Read of size 4 at addr 0000000000000060 by task syz.2.5443/29947

CPU: 1 UID: 0 PID: 29947 Comm: syz.2.5443 Not tainted syzkaller #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
 kasan_report+0x118/0x150
 kasan_check_range+0x2b0/0x2c0
 drop_buffers+0x65/0x4f0
 try_to_free_buffers+0x1e1/0x2d0
 shrink_folio_list+0x20ac/0x4cd0
 evict_folios+0x47f2/0x58b0
 try_to_shrink_lruvec+0x8a3/0xb50
 shrink_lruvec+0x49c/0x2980
 shrink_node+0xa4e/0x3760
 do_try_to_free_pages+0x668/0x1960
 try_to_free_mem_cgroup_pages+0x2fa/0x7e0
 try_charge_memcg+0xa40/0x1290
 __memcg_kmem_charge_page+0xe1/0x240
 __alloc_frozen_pages_noprof+0x1b5/0x370
 __alloc_pages_noprof+0xa/0x30
 __vmalloc_node_range_noprof+0x910/0x12f0
 bpf_map_area_alloc+0x12d/0x180
 bloom_map_alloc+0x22f/0x470
 map_create+0xaa3/0x14d0
 __sys_bpf+0x60f/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff079b8ebe9
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:00007ff07aada038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ff079db5fa0 RCX: 00007ff079b8ebe9
RDX: 0000000000000050 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007ff079c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff079db6038 R14: 00007ff079db5fa0 R15: 00007fff87fd3d88
 </TASK>
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