syzbot

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BUG: KCSAN: data-race in ext4_es_is_delayed / ext4_es_lookup_extent

write to 0xffff8881128be660 of 8 bytes by task 9972 on cpu 0:
 ext4_es_set_referenced fs/ext4/extents_status.h:194 [inline]
 ext4_es_lookup_extent+0x296/0x4f0 fs/ext4/extents_status.c:950
 ext4_map_blocks+0xad/0xf40 fs/ext4/inode.c:517
 mpage_map_one_extent+0x10d/0x3c0 fs/ext4/inode.c:2376
 mpage_map_and_submit_extent fs/ext4/inode.c:2429 [inline]
 ext4_writepages+0xa4c/0x1ef0 fs/ext4/inode.c:2781
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:422
 __filemap_fdatawrite mm/filemap.c:430 [inline]
 filemap_flush+0x1f/0x30 mm/filemap.c:457
 ext4_alloc_da_blocks+0x4c/0x130 fs/ext4/inode.c:3145
 ext4_release_file+0x5b/0x1c0 fs/ext4/file.c:142
 __fput+0x246/0x4d0 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:163 [inline]
 exit_to_user_mode_prepare+0x1b2/0x210 kernel/entry/common.c:190
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:265
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881128be660 of 8 bytes by task 9973 on cpu 1:
 ext4_es_type fs/ext4/extents_status.h:159 [inline]
 ext4_es_is_delayed+0x12/0x20 fs/ext4/extents_status.h:174
 __es_find_extent_range+0x1d5/0x330 fs/ext4/extents_status.c:285
 ext4_es_find_extent_range+0x47/0x210 fs/ext4/extents_status.c:317
 ext4_ext_put_gap_in_cache fs/ext4/extents.c:2236 [inline]
 ext4_ext_map_blocks+0xca7/0x20c0 fs/ext4/extents.c:4142
 ext4_da_map_blocks fs/ext4/inode.c:1741 [inline]
 ext4_da_get_block_prep+0x3f1/0x990 fs/ext4/inode.c:1818
 ext4_block_write_begin+0x433/0xb60 fs/ext4/inode.c:1060
 ext4_da_write_begin+0x507/0xad0 fs/ext4/inode.c:2996
 generic_perform_write+0x196/0x390 mm/filemap.c:3501
 ext4_buffered_write_iter+0x2cc/0x3b0 fs/ext4/file.c:269
 ext4_file_write_iter+0x768/0x1060 include/linux/fs.h:784
 call_write_iter include/linux/fs.h:1882 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x665/0x6f0 fs/read_write.c:578
 ksys_write+0xce/0x180 fs/read_write.c:631
 __do_sys_write fs/read_write.c:643 [inline]
 __se_sys_write fs/read_write.c:640 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:640
 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: 9973 Comm: syz-executor.0 Not tainted 5.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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