syzbot

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BUG: KCSAN: data-race in __es_find_extent_range / ext4_es_lookup_extent

write to 0xffff88810dddba48 of 8 bytes by task 22607 on cpu 0:
 __es_find_extent_range+0x28e/0x330 fs/ext4/extents_status.c:298
 __es_scan_range fs/ext4/extents_status.c:347 [inline]
 ext4_es_scan_range+0x94/0x140 fs/ext4/extents_status.c:371
 ext4_map_blocks+0xa87/0xfc0 fs/ext4/inode.c:703
 ext4_alloc_file_blocks+0x26f/0x700 fs/ext4/extents.c:4426
 ext4_fallocate+0x2a7/0x540 fs/ext4/extents.c:4705
 vfs_fallocate+0x471/0x6c0 fs/open.c:309
 ksys_fallocate fs/open.c:332 [inline]
 __do_sys_fallocate fs/open.c:340 [inline]
 __se_sys_fallocate fs/open.c:338 [inline]
 __x64_sys_fallocate+0x75/0xc0 fs/open.c:338
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810dddba48 of 8 bytes by task 22598 on cpu 1:
 ext4_es_lookup_extent+0xac/0x500 fs/ext4/extents_status.c:937
 ext4_map_blocks+0x105/0xfc0 fs/ext4/inode.c:529
 ext4_mpage_readpages+0x630/0x14c0 fs/ext4/readpage.c:304
 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3261
 read_pages+0xa0/0x6e0 mm/readahead.c:130
 page_cache_ra_unbounded+0x464/0x4c0 mm/readahead.c:238
 ondemand_readahead+0x560/0x780 mm/readahead.c:267
 page_cache_sync_ra+0x1ab/0x1c0 mm/readahead.c:577
 page_cache_sync_readahead include/linux/pagemap.h:839 [inline]
 generic_file_buffered_read_get_pages+0x234/0xaf0 mm/filemap.c:2361
 generic_file_buffered_read+0x27f/0x9a0 mm/filemap.c:2481
 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2633
 ext4_file_read_iter+0x2d0/0x420 fs/ext4/file.c:74
 call_read_iter include/linux/fs.h:1895 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:788 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5db/0xca0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22598 Comm: syz-executor.2 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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