------------[ cut here ]------------ UBSAN: shift-out-of-bounds in mm/shrinker.c:406:18 shift exponent -1 is negative CPU: 0 PID: 5839 Comm: syz-executor.2 Not tainted 6.10.0-rc1-next-20240528-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 do_shrink_slab+0xe26/0x1160 mm/shrinker.c:406 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0x87c/0x14d0 mm/shrinker.c:626 shrink_node_memcgs mm/vmscan.c:5923 [inline] shrink_node+0xb82/0x4150 mm/vmscan.c:5961 shrink_zones mm/vmscan.c:6205 [inline] do_try_to_free_pages+0x789/0x1cb0 mm/vmscan.c:6267 try_to_free_mem_cgroup_pages+0x48f/0xb10 mm/vmscan.c:6598 try_charge_memcg+0x704/0x1850 mm/memcontrol.c:2946 obj_cgroup_charge_pages mm/memcontrol.c:3420 [inline] __memcg_kmem_charge_page+0xe2/0x250 mm/memcontrol.c:3446 __alloc_pages_noprof+0x28c/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:122 [inline] bpf_ringbuf_alloc+0xcb/0x420 kernel/bpf/ringbuf.c:170 ringbuf_map_alloc+0x1d7/0x2f0 kernel/bpf/ringbuf.c:204 map_create+0x90c/0x1200 kernel/bpf/syscall.c:1333 __sys_bpf+0x6d1/0x810 kernel/bpf/syscall.c:5669 __do_sys_bpf kernel/bpf/syscall.c:5794 [inline] __se_sys_bpf kernel/bpf/syscall.c:5792 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5792 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: 0033:0x7fdc4c07cee9 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:00007fdc4ce990c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fdc4c1b3fa0 RCX: 00007fdc4c07cee9 RDX: 0000000000000048 RSI: 00000000200002c0 RDI: 0000000000000000 RBP: 00007fdc4c0c947f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fdc4c1b3fa0 R15: 00007ffcee1b6958 ---[ end trace ]---