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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:2876 [inline]
BUG: KASAN: null-ptr-deref in drop_buffers+0x6f/0x710 fs/buffer.c:2888
Read of size 4 at addr 0000000000000060 by task syz.2.709/12768

CPU: 0 UID: 0 PID: 12768 Comm: syz.2.709 Not tainted 6.12.0-syzkaller-10689-g7af08b57bcb9 #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:492
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 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:2876 [inline]
 drop_buffers+0x6f/0x710 fs/buffer.c:2888
 try_to_free_buffers+0x295/0x5f0 fs/buffer.c:2942
 shrink_folio_list+0x23d1/0x8fe0 mm/vmscan.c:1433
 shrink_inactive_list mm/vmscan.c:1960 [inline]
 shrink_list mm/vmscan.c:2198 [inline]
 shrink_lruvec+0x16db/0x2f30 mm/vmscan.c:5727
 shrink_node_memcgs mm/vmscan.c:5929 [inline]
 shrink_node+0x12a4/0x2e10 mm/vmscan.c:5970
 shrink_zones mm/vmscan.c:6215 [inline]
 do_try_to_free_pages+0x69d/0x1b20 mm/vmscan.c:6277
 try_to_free_mem_cgroup_pages+0x4b8/0xaf0 mm/vmscan.c:6609
 try_charge_memcg+0x8c7/0x1150 mm/memcontrol.c:2238
 try_charge mm/memcontrol-v1.h:19 [inline]
 charge_memcg+0xa6/0x1e0 mm/memcontrol.c:4497
 __mem_cgroup_charge+0x27/0x80 mm/memcontrol.c:4512
 mem_cgroup_charge include/linux/memcontrol.h:646 [inline]
 filemap_add_folio+0xb3/0x650 mm/filemap.c:966
 do_read_cache_folio+0x341/0x850 mm/filemap.c:3793
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 dir_get_folio fs/sysv/dir.c:64 [inline]
 sysv_find_entry+0x16a/0x4b0 fs/sysv/dir.c:154
 sysv_inode_by_name+0x98/0x2a0 fs/sysv/dir.c:370
 sysv_lookup+0x6b/0xe0 fs/sysv/namei.c:38
 __lookup_slow+0x28c/0x3f0 fs/namei.c:1791
 lookup_slow+0x53/0x70 fs/namei.c:1808
 walk_component+0x2e1/0x410 fs/namei.c:2112
 lookup_last fs/namei.c:2610 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2634
 do_o_path+0x95/0x230 fs/namei.c:3958
 path_openat+0x2ebf/0x3590 fs/namei.c:3980
 do_filp_open+0x27f/0x4e0 fs/namei.c:4014
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402
 do_sys_open fs/open.c:1417 [inline]
 __do_sys_openat fs/open.c:1433 [inline]
 __se_sys_openat fs/open.c:1428 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1428
 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: 0033:0x7f6f25180809
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:00007f6f25fe5058 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6f25345fa0 RCX: 00007f6f25180809
RDX: 0000000000343742 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f6f251f393e R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000008d R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6f25345fa0 R15: 00007fff145e1c28
 </TASK>
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