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BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent

write to 0xffff888129a04c28 of 8 bytes by task 7427 on cpu 1:
 ext4_es_lookup_extent+0x3d3/0x510 fs/ext4/extents_status.c:950
 ext4_da_map_blocks fs/ext4/inode.c:1871 [inline]
 ext4_da_get_block_prep+0x159/0xa60 fs/ext4/inode.c:1992
 __block_write_begin_int+0x2ea/0xf10 fs/buffer.c:1968
 __block_write_begin fs/buffer.c:2018 [inline]
 block_page_mkwrite+0x19f/0x230 fs/buffer.c:2480
 ext4_page_mkwrite+0x5af/0xce0 fs/ext4/inode.c:6238
 do_page_mkwrite+0x8f/0x1a0 mm/memory.c:2199
 wp_page_shared mm/memory.c:2498 [inline]
 do_wp_page+0xa91/0xd00 mm/memory.c:2610
 handle_pte_fault mm/memory.c:3856 [inline]
 __handle_mm_fault+0x1c3d/0x2d00 mm/memory.c:3964
 handle_mm_fault+0x21b/0x520 mm/memory.c:4001
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202
 copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:204
 copy_page_to_iter_iovec lib/iov_iter.c:211 [inline]
 copy_page_to_iter+0x1b4/0x890 lib/iov_iter.c:900

read to 0xffff888129a04c28 of 8 bytes by task 7425 on cpu 0:
 ext4_es_lookup_extent+0x3ba/0x510 fs/ext4/extents_status.c:950
 ext4_da_map_blocks fs/ext4/inode.c:1871 [inline]
 ext4_da_get_block_prep+0x159/0xa60 fs/ext4/inode.c:1992
 __block_write_begin_int+0x2ea/0xf10 fs/buffer.c:1968
 __block_write_begin fs/buffer.c:2018 [inline]
 block_page_mkwrite+0x19f/0x230 fs/buffer.c:2480
 ext4_page_mkwrite+0x5af/0xce0 fs/ext4/inode.c:6238
 do_page_mkwrite+0x8f/0x1a0 mm/memory.c:2199
 wp_page_shared mm/memory.c:2498 [inline]
 do_wp_page+0xa91/0xd00 mm/memory.c:2610
 handle_pte_fault mm/memory.c:3856 [inline]
 __handle_mm_fault+0x1c3d/0x2d00 mm/memory.c:3964
 handle_mm_fault+0x21b/0x520 mm/memory.c:4001
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202
 copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:204

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7425 Comm: syz-executor.0 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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