================================================================== 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:2882 [inline] BUG: KASAN: null-ptr-deref in drop_buffers.constprop.0+0x89/0x340 fs/buffer.c:2894 Read of size 4 at addr 0000000000000060 by task syz-executor.1/1209 CPU: 0 PID: 1209 Comm: syz-executor.1 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 kasan_report+0xda/0x110 mm/kasan/report.c:601 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x190 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:2882 [inline] drop_buffers.constprop.0+0x89/0x340 fs/buffer.c:2894 try_to_free_buffers+0x21a/0x2d0 fs/buffer.c:2924 filemap_release_folio+0x212/0x270 mm/filemap.c:4087 shrink_folio_list+0x292c/0x3ea0 mm/vmscan.c:1369 evict_folios+0x6e7/0x1b90 mm/vmscan.c:4521 try_to_shrink_lruvec+0x638/0xa10 mm/vmscan.c:4726 lru_gen_shrink_lruvec mm/vmscan.c:4869 [inline] shrink_lruvec+0x314/0x2990 mm/vmscan.c:5647 shrink_node_memcgs mm/vmscan.c:5867 [inline] shrink_node+0x81b/0x3740 mm/vmscan.c:5902 shrink_zones mm/vmscan.c:6141 [inline] do_try_to_free_pages+0x36c/0x1940 mm/vmscan.c:6203 try_to_free_mem_cgroup_pages+0x31a/0x770 mm/vmscan.c:6518 try_charge_memcg+0x3d3/0x11a0 mm/memcontrol.c:2762 obj_cgroup_charge_pages mm/memcontrol.c:3275 [inline] __memcg_kmem_charge_page+0xdd/0x2a0 mm/memcontrol.c:3301 __alloc_pages+0x264/0x2440 mm/page_alloc.c:4584 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:122 [inline] bpf_ringbuf_alloc kernel/bpf/ringbuf.c:170 [inline] ringbuf_map_alloc kernel/bpf/ringbuf.c:204 [inline] ringbuf_map_alloc+0x294/0x790 kernel/bpf/ringbuf.c:186 map_create+0x548/0x1b90 kernel/bpf/syscall.c:1237 __sys_bpf+0xa32/0x4a00 kernel/bpf/syscall.c:5439 __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5559 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f6678c7cda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f66799680c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6678dabf80 RCX: 00007f6678c7cda9 RDX: 0000000000000048 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f6678cc947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f6678dabf80 R15: 00007ffd78afc808 ==================================================================