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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:2881 [inline]
BUG: KASAN: null-ptr-deref in drop_buffers+0x6f/0x710 fs/buffer.c:2893
Read of size 4 at addr 0000000000000060 by task syz.4.2301/12287

CPU: 1 UID: 0 PID: 12287 Comm: syz.4.2301 Not tainted 6.12.0-rc2-next-20241008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 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:2881 [inline]
 drop_buffers+0x6f/0x710 fs/buffer.c:2893
 try_to_free_buffers+0x295/0x5f0 fs/buffer.c:2947
 shrink_folio_list+0x240c/0x8cc0 mm/vmscan.c:1432
 evict_folios+0x549b/0x7b50 mm/vmscan.c:4590
 try_to_shrink_lruvec+0x9ab/0xbb0 mm/vmscan.c:4785
 lru_gen_shrink_lruvec mm/vmscan.c:4927 [inline]
 shrink_lruvec+0x541/0x31b0 mm/vmscan.c:5682
 shrink_node_memcgs mm/vmscan.c:5918 [inline]
 shrink_node+0xb09/0x3df0 mm/vmscan.c:5958
 shrink_zones mm/vmscan.c:6203 [inline]
 do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6265
 try_to_free_mem_cgroup_pages+0x48f/0xb10 mm/vmscan.c:6597
 try_charge_memcg+0x8c2/0x1170 mm/memcontrol.c:2209
 try_charge mm/memcontrol-v1.h:19 [inline]
 charge_memcg+0xa6/0x1e0 mm/memcontrol.c:4468
 __mem_cgroup_charge+0x27/0x80 mm/memcontrol.c:4483
 mem_cgroup_charge include/linux/memcontrol.h:694 [inline]
 filemap_add_folio+0xb3/0x650 mm/filemap.c:967
 do_read_cache_folio+0x341/0x850 mm/filemap.c:3794
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 dir_get_folio fs/sysv/dir.c:64 [inline]
 sysv_readdir+0x193/0x540 fs/sysv/dir.c:93
 iterate_dir+0x571/0x800 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1a31d7dff9
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:00007f1a32bea038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f1a31f35f80 RCX: 00007f1a31d7dff9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f1a31df0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1a31f35f80 R15: 00007ffca2b9c148
 </TASK>
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