==================================================================
BUG: KCSAN: data-race in ext4_mb_good_group / mb_free_blocks

write to 0xffff8881010edb54 of 4 bytes by task 22704 on cpu 0:
 mb_free_blocks+0x156/0xb40 fs/ext4/mballoc.c:1802
 ext4_free_blocks+0x14ea/0x1c20 fs/ext4/mballoc.c:6061
 ext4_clear_blocks+0x292/0x2b0 fs/ext4/indirect.c:880
 ext4_free_data+0x153/0x2e0 fs/ext4/indirect.c:941
 ext4_free_branches+0x65/0x440 fs/ext4/indirect.c:1100
 ext4_ind_truncate+0x649/0x8c0 fs/ext4/indirect.c:1173
 ext4_truncate+0x756/0xa80 fs/ext4/inode.c:4270
 ext4_truncate_failed_write fs/ext4/truncate.h:22 [inline]
 ext4_handle_inode_extension fs/ext4/file.c:358 [inline]
 ext4_dio_write_iter fs/ext4/file.c:574 [inline]
 ext4_file_write_iter+0xcf4/0x11f0 fs/ext4/file.c:678
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881010edb54 of 4 bytes by task 22696 on cpu 1:
 ext4_mb_good_group+0x131/0x370 fs/ext4/mballoc.c:2432
 ext4_mb_good_group_nolock fs/ext4/mballoc.c:2545 [inline]
 ext4_mb_regular_allocator+0x1610/0x2530 fs/ext4/mballoc.c:2747
 ext4_mb_new_blocks+0x792/0x1fc0 fs/ext4/mballoc.c:5586
 ext4_alloc_branch fs/ext4/indirect.c:333 [inline]
 ext4_ind_map_blocks+0xb1b/0x16d0 fs/ext4/indirect.c:628
 ext4_map_blocks+0x6e3/0xf00 fs/ext4/inode.c:639
 ext4_iomap_alloc fs/ext4/inode.c:3432 [inline]
 ext4_iomap_begin+0x4b0/0x630 fs/ext4/inode.c:3482
 iomap_iter+0x39c/0x470 fs/iomap/iter.c:74
 __iomap_dio_rw+0xbe3/0x1010 fs/iomap/direct-io.c:568
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649
 ext4_dio_write_iter fs/ext4/file.c:568 [inline]
 ext4_file_write_iter+0xaa9/0x11f0 fs/ext4/file.c:678
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000003 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22696 Comm: syz-executor.0 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
syz-executor.0 (22696) used greatest stack depth: 9632 bytes left