syzbot

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BUG: KCSAN: data-race in __es_shrink / __es_shrink

write to 0xffff88814443d4a0 of 8 bytes by task 2121 on cpu 1:
 __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:512
 shrink_slab+0xea/0x1c0 mm/vmscan.c:673
 shrink_node_memcgs+0x28a/0x420 mm/vmscan.c:2655
 shrink_node+0x9fa/0x1220 mm/vmscan.c:2770
 kswapd_shrink_node mm/vmscan.c:3513 [inline]
 balance_pgdat+0x6a5/0xc50 mm/vmscan.c:3671
 kswapd+0x1f3/0x340 mm/vmscan.c:3928
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88814443d4a0 of 8 bytes by task 10752 on cpu 0:
 __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:512
 shrink_slab+0xea/0x1c0 mm/vmscan.c:673
 shrink_node_memcgs+0x28a/0x420 mm/vmscan.c:2655
 shrink_node+0x9fa/0x1220 mm/vmscan.c:2770
 shrink_zones+0x2af/0x490 mm/vmscan.c:2973
 do_try_to_free_pages+0x193/0x6f0 mm/vmscan.c:3028
 try_to_free_pages+0x396/0x870 mm/vmscan.c:3267
 __perform_reclaim mm/page_alloc.c:4385 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4406 [inline]
 __alloc_pages_slowpath+0x544/0x9e0 mm/page_alloc.c:4810
 __alloc_pages_nodemask+0x26a/0x350 mm/page_alloc.c:5020
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2277
 alloc_pages include/linux/gfp.h:561 [inline]
 __vmalloc_area_node mm/vmalloc.c:2510 [inline]
 __vmalloc_node_range+0x2cf/0x540 mm/vmalloc.c:2576
 __bpf_map_area_alloc+0xfd/0x120 kernel/bpf/syscall.c:306
 bpf_map_area_alloc+0x18/0x20 kernel/bpf/syscall.c:313
 prealloc_init kernel/bpf/hashtab.c:284 [inline]
 htab_map_alloc+0x663/0xc80 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+0x420c/0x99c0 kernel/bpf/syscall.c:4375
 __se_sys_bpf kernel/bpf/syscall.c:4351 [inline]
 __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4351
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10752 Comm: syz-executor.0 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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