================================================================== 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+0x6f/0x710 fs/buffer.c:2894 Read of size 4 at addr 0000000000000060 by task syz-executor.1/24594 CPU: 0 PID: 24594 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+0x1e7/0x2d0 lib/dump_stack.c:106 print_report+0xe6/0x540 mm/kasan/report.c:491 kasan_report+0x142/0x170 mm/kasan/report.c:601 kasan_check_range+0x27e/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:2882 [inline] drop_buffers+0x6f/0x710 fs/buffer.c:2894 try_to_free_buffers+0x295/0x5f0 fs/buffer.c:2924 shrink_folio_list+0x26f3/0x89c0 mm/vmscan.c:1369 shrink_inactive_list mm/vmscan.c:1914 [inline] shrink_list mm/vmscan.c:2155 [inline] shrink_lruvec+0x16e6/0x2d40 mm/vmscan.c:5681 shrink_node_memcgs mm/vmscan.c:5867 [inline] shrink_node+0x1191/0x28e0 mm/vmscan.c:5902 shrink_zones mm/vmscan.c:6141 [inline] do_try_to_free_pages+0x717/0x19e0 mm/vmscan.c:6203 try_to_free_mem_cgroup_pages+0x455/0xa70 mm/vmscan.c:6518 try_charge_memcg+0x6d8/0x18a0 mm/memcontrol.c:2762 obj_cgroup_charge_pages mm/memcontrol.c:3275 [inline] __memcg_kmem_charge_page+0xe1/0x250 mm/memcontrol.c:3301 __alloc_pages+0x28b/0x680 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+0xcb/0x420 kernel/bpf/ringbuf.c:170 ringbuf_map_alloc+0x1d3/0x2f0 kernel/bpf/ringbuf.c:204 map_create+0x848/0x1040 kernel/bpf/syscall.c:1237 __sys_bpf+0x6a2/0x810 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+0x7c/0x90 kernel/bpf/syscall.c:5559 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fcb9827cda9 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:00007fcb990d80c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fcb983abf80 RCX: 00007fcb9827cda9 RDX: 0000000000000048 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00007fcb982c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fcb983abf80 R15: 00007fff6c4013c8 ==================================================================