================================================================== BUG: KCSAN: data-race in __es_shrink / __es_shrink write to 0xffff88814430ec78 of 8 bytes by task 2923 on cpu 0: __es_shrink+0x3a0/0x560 fs/ext4/extents_status.c:1536 ext4_es_scan+0x87/0x210 fs/ext4/extents_status.c:1580 do_shrink_slab+0x28b/0x550 mm/vmscan.c:511 shrink_slab+0xea/0x1c0 mm/vmscan.c:672 shrink_node_memcgs+0x27a/0x410 mm/vmscan.c:2663 shrink_node+0x9fa/0x1210 mm/vmscan.c:2778 shrink_zones+0x29f/0x470 mm/vmscan.c:2981 do_try_to_free_pages+0x193/0x6f0 mm/vmscan.c:3036 try_to_free_pages+0x399/0x870 mm/vmscan.c:3275 __perform_reclaim mm/page_alloc.c:4376 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4397 [inline] __alloc_pages_slowpath+0x52f/0x9c0 mm/page_alloc.c:4801 __alloc_pages_nodemask+0x269/0x350 mm/page_alloc.c:5011 __alloc_pages include/linux/gfp.h:511 [inline] __alloc_pages_node include/linux/gfp.h:524 [inline] alloc_pages_node include/linux/gfp.h:538 [inline] pcpu_alloc_pages mm/percpu-vm.c:94 [inline] pcpu_populate_chunk+0x1bd/0xa60 mm/percpu-vm.c:284 pcpu_alloc+0x91b/0x1020 mm/percpu.c:1819 __alloc_percpu_gfp+0x22/0x30 mm/percpu.c:1893 bpf_map_alloc_percpu+0xab/0x120 kernel/bpf/syscall.c:435 prealloc_init kernel/bpf/hashtab.c:296 [inline] htab_map_alloc+0x807/0xc70 kernel/bpf/hashtab.c:508 find_and_alloc_map kernel/bpf/syscall.c:122 [inline] map_create kernel/bpf/syscall.c:828 [inline] __do_sys_bpf+0x3fea/0x99c0 kernel/bpf/syscall.c:4362 __se_sys_bpf kernel/bpf/syscall.c:4338 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4338 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88814430ec78 of 8 bytes by task 2191 on cpu 1: __es_shrink+0x374/0x560 fs/ext4/extents_status.c:1536 ext4_es_scan+0x87/0x210 fs/ext4/extents_status.c:1580 do_shrink_slab+0x28b/0x550 mm/vmscan.c:511 shrink_slab+0xea/0x1c0 mm/vmscan.c:672 shrink_node_memcgs+0x27a/0x410 mm/vmscan.c:2663 shrink_node+0x9fa/0x1210 mm/vmscan.c:2778 kswapd_shrink_node mm/vmscan.c:3521 [inline] balance_pgdat+0x6a5/0xc40 mm/vmscan.c:3679 kswapd+0x1de/0x310 mm/vmscan.c:3936 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2191 Comm: kswapd1 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================