syzbot

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BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [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:2886 [inline]
BUG: KASAN: null-ptr-deref in drop_buffers+0x6f/0x710 fs/buffer.c:2898
Read of size 4 at addr 0000000000000060 by task kswapd0/79

CPU: 0 UID: 0 PID: 79 Comm: kswapd0 Not tainted 6.11.0-rc5-syzkaller-00316-g6cd90e5ea72f #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 print_report+0xe8/0x550 mm/kasan/report.c:491
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 buffer_busy fs/buffer.c:2886 [inline]
 drop_buffers+0x6f/0x710 fs/buffer.c:2898
 try_to_free_buffers+0x295/0x5f0 fs/buffer.c:2952
 shrink_folio_list+0x26c2/0x8c90 mm/vmscan.c:1413
 evict_folios+0x54c7/0x7b60 mm/vmscan.c:4580
 try_to_shrink_lruvec+0x9ab/0xbb0 mm/vmscan.c:4775
 shrink_one+0x3b9/0x850 mm/vmscan.c:4813
 shrink_many mm/vmscan.c:4876 [inline]
 lru_gen_shrink_node mm/vmscan.c:4954 [inline]
 shrink_node+0x3799/0x3de0 mm/vmscan.c:5934
 kswapd_shrink_node mm/vmscan.c:6762 [inline]
 balance_pgdat mm/vmscan.c:6954 [inline]
 kswapd+0x1cbc/0x3720 mm/vmscan.c:7223
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
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