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BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:82 [inline]
BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: null-ptr-deref in buffer_busy fs/buffer.c:2799 [inline]
BUG: KASAN: null-ptr-deref in drop_buffers+0x60/0x320 fs/buffer.c:2811
Read of size 4 at addr 0000000000000060 by task kswapd0/69

CPU: 0 UID: 0 PID: 69 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 instrument_atomic_read include/linux/instrumented.h:82 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 buffer_busy fs/buffer.c:2799 [inline]
 drop_buffers+0x60/0x320 fs/buffer.c:2811
 try_to_free_buffers+0x209/0x300 fs/buffer.c:2868
 shrink_folio_list+0x2249/0x52a0 mm/vmscan.c:1466
 evict_folios+0x4998/0x5ac0 mm/vmscan.c:4854
 try_to_shrink_lruvec+0xbca/0x1050 mm/vmscan.c:5009
 shrink_one+0x25c/0x710 mm/vmscan.c:5069
 shrink_many mm/vmscan.c:5132 [inline]
 lru_gen_shrink_node mm/vmscan.c:5210 [inline]
 shrink_node+0x31bf/0x3ae0 mm/vmscan.c:6198
 kswapd_shrink_node mm/vmscan.c:7052 [inline]
 balance_pgdat mm/vmscan.c:7228 [inline]
 kswapd+0x1736/0x2de0 mm/vmscan.c:7501
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
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