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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+0x65/0x4f0 fs/buffer.c:2898
Read of size 4 at addr 0000000000000060 by task syz.0.2179/14564

CPU: 1 UID: 0 PID: 14564 Comm: syz.0.2179 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 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+0x65/0x4f0 fs/buffer.c:2898
 try_to_free_buffers+0x1e1/0x2d0 fs/buffer.c:2952
 shrink_folio_list+0x20ac/0x4c70 mm/vmscan.c:1511
 evict_folios+0x47f2/0x58b0 mm/vmscan.c:4737
 try_to_shrink_lruvec+0x8a3/0xb50 mm/vmscan.c:4900
 lru_gen_shrink_lruvec mm/vmscan.c:5049 [inline]
 shrink_lruvec+0x49c/0x2980 mm/vmscan.c:5810
 shrink_node_memcgs mm/vmscan.c:6046 [inline]
 shrink_node+0xa4e/0x3760 mm/vmscan.c:6087
 shrink_zones mm/vmscan.c:6331 [inline]
 do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6393
 try_to_free_mem_cgroup_pages+0x2fa/0x7e0 mm/vmscan.c:6721
 try_charge_memcg+0xa40/0x1290 mm/memcontrol.c:2354
 obj_cgroup_charge_pages mm/memcontrol.c:2797 [inline]
 __memcg_kmem_charge_page+0xe1/0x240 mm/memcontrol.c:2841
 __alloc_frozen_pages_noprof+0x1b5/0x370 mm/page_alloc.c:5165
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507
 io_mem_alloc_compound io_uring/memmap.c:30 [inline]
 io_region_allocate_pages+0xee/0x4c0 io_uring/memmap.c:168
 io_create_region+0x374/0x480 io_uring/memmap.c:224
 io_allocate_scq_urings+0x4e9/0x7f0 io_uring/io_uring.c:3615
 io_uring_create+0x52b/0xb60 io_uring/io_uring.c:3821
 io_uring_setup io_uring/io_uring.c:3911 [inline]
 __do_sys_io_uring_setup io_uring/io_uring.c:3945 [inline]
 __se_sys_io_uring_setup+0x264/0x270 io_uring/io_uring.c:3936
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f93c098ebe9
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:00007f93c1833fc8 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00007f93c0bb6180 RCX: 00007f93c098ebe9
RDX: 0000000000000000 RSI: 0000200000000440 RDI: 00000000000019b8
RBP: 0000200000000440 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000000019b8 R15: 0000000000000000
 </TASK>
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