syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / ext4_set_iomap

write to 0xffff88810ef897f8 of 8 bytes by task 29612 on cpu 0:
 __mark_inode_dirty+0x222/0x6f0 fs/fs-writeback.c:2312
 mark_inode_dirty_sync include/linux/fs.h:2272 [inline]
 dquot_claim_block include/linux/quotaops.h:364 [inline]
 ext4_da_update_reserve_space+0x160/0x2e0 fs/ext4/inode.c:381
 ext4_ext_map_blocks+0x173b/0x1fd0 fs/ext4/extents.c:4291
 ext4_map_blocks+0x726/0xff0 fs/ext4/inode.c:638
 mpage_map_one_extent+0x10d/0x3a0 fs/ext4/inode.c:2397
 mpage_map_and_submit_extent fs/ext4/inode.c:2450 [inline]
 ext4_writepages+0xa51/0x1e70 fs/ext4/inode.c:2802
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:424
 filemap_write_and_wait_range+0x8b/0x2a0 mm/filemap.c:657
 __iomap_dio_rw+0x40a/0xa30 fs/iomap/direct-io.c:525
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x3bb/0x420 fs/ext4/file.c:128
 call_read_iter include/linux/fs.h:1971 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810ef897f8 of 8 bytes by task 29623 on cpu 1:
 ext4_inode_datasync_dirty fs/ext4/inode.c:3332 [inline]
 ext4_set_iomap+0x17c/0x460 fs/ext4/inode.c:3347
 ext4_iomap_begin+0x64b/0x6a0 fs/ext4/inode.c:3486
 iomap_apply+0x8d/0x4a0 fs/iomap/apply.c:46
 __iomap_dio_rw+0x4c4/0xa30 fs/iomap/direct-io.c:553
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x3bb/0x420 fs/ext4/file.c:128
 call_read_iter include/linux/fs.h:1971 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 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: 1 PID: 29623 Comm: syz-executor.0 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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