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BUG: KCSAN: data-race in __es_shrink / __es_shrink

write to 0xffff8881013d6c78 of 8 bytes by task 32689 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:513
 shrink_slab+0xea/0x1c0 mm/vmscan.c:674
 shrink_node_memcgs+0x27a/0x410 mm/vmscan.c:2656
 shrink_node+0x9d2/0x11d0 mm/vmscan.c:2771
 shrink_zones+0x29f/0x470 mm/vmscan.c:2974
 do_try_to_free_pages+0x193/0x6e0 mm/vmscan.c:3029
 try_to_free_pages+0x399/0x870 mm/vmscan.c:3268
 __perform_reclaim mm/page_alloc.c:4330 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4351 [inline]
 __alloc_pages_slowpath+0x52f/0x9c0 mm/page_alloc.c:4755
 __alloc_pages_nodemask+0x269/0x350 mm/page_alloc.c:4965
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2271
 alloc_pages include/linux/gfp.h:547 [inline]
 relay_alloc_buf kernel/relay.c:136 [inline]
 relay_create_buf kernel/relay.c:177 [inline]
 relay_open_buf+0x1fc/0x800 kernel/relay.c:453
 relay_open+0x31b/0x620 kernel/relay.c:605
 do_blk_trace_setup+0x315/0x560 kernel/trace/blktrace.c:557
 __blk_trace_setup kernel/trace/blktrace.c:597 [inline]
 blk_trace_ioctl+0x20f/0x330 kernel/trace/blktrace.c:738
 blkdev_ioctl+0xbc/0x3f0 block/ioctl.c:616
 block_ioctl+0x6d/0x80 fs/block_dev.c:1869
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881013d6c78 of 8 bytes by task 8434 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:513
 shrink_slab+0xea/0x1c0 mm/vmscan.c:674
 shrink_node_memcgs+0x27a/0x410 mm/vmscan.c:2656
 shrink_node+0x9d2/0x11d0 mm/vmscan.c:2771
 shrink_zones+0x29f/0x470 mm/vmscan.c:2974
 do_try_to_free_pages+0x193/0x6e0 mm/vmscan.c:3029
 try_to_free_pages+0x399/0x870 mm/vmscan.c:3268
 __perform_reclaim mm/page_alloc.c:4330 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4351 [inline]
 __alloc_pages_slowpath+0x52f/0x9c0 mm/page_alloc.c:4755
 __alloc_pages_nodemask+0x269/0x350 mm/page_alloc.c:4965
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2271
 alloc_pages include/linux/gfp.h:547 [inline]
 __page_cache_alloc+0x4d/0xf0 mm/filemap.c:977
 pagecache_get_page+0x554/0x980 mm/filemap.c:1828
 filemap_fault+0xbe6/0x12e0 mm/filemap.c:2725
 ext4_filemap_fault+0x4b/0x60 fs/ext4/inode.c:6192
 __do_fault mm/memory.c:3612 [inline]
 do_read_fault+0x403/0x760 mm/memory.c:4006
 do_fault mm/memory.c:4134 [inline]
 handle_pte_fault mm/memory.c:4374 [inline]
 __handle_mm_fault mm/memory.c:4509 [inline]
 handle_mm_fault+0xfeb/0x1770 mm/memory.c:4607
 do_user_addr_fault+0x33e/0x730 arch/x86/mm/fault.c:1372
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1485
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8434 Comm: syz-fuzzer Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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