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.constprop.0+0x89/0x340 fs/buffer.c:2898
Read of size 4 at addr 0000000000000060 by task kswapd0/85

CPU: 1 UID: 0 PID: 85 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:194 [inline]
 kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200
 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.constprop.0+0x89/0x340 fs/buffer.c:2898
 try_to_free_buffers+0x21c/0x2d0 fs/buffer.c:2952
 filemap_release_folio+0x219/0x280 mm/filemap.c:4423
 shrink_folio_list+0x28a5/0x4800 mm/vmscan.c:1519
 evict_folios+0x79c/0x1b30 mm/vmscan.c:4745
 try_to_shrink_lruvec+0x585/0x9b0 mm/vmscan.c:4908
 shrink_one+0x3e3/0x7a0 mm/vmscan.c:4953
 shrink_many mm/vmscan.c:5016 [inline]
 lru_gen_shrink_node mm/vmscan.c:5094 [inline]
 shrink_node+0x26cb/0x3d80 mm/vmscan.c:6081
 kswapd_shrink_node mm/vmscan.c:6941 [inline]
 balance_pgdat+0xbb8/0x1a50 mm/vmscan.c:7124
 kswapd+0x590/0xb90 mm/vmscan.c:7389
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
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